EVM3GSX50B14 Datasheet and Pinout: Specs for Design and Sourcing
EVM3GSX50B14 datasheet essentials, pinout overview, key specs, and design/sourcing checks for engineers and buyers. Request a quote on IC-Online.
Why a 3-mm Trimmer Still Holds Up Production Lines in 2025
When a calibration circuit fails on the factory floor, the culprit is rarely the DSP or the microcontroller. It is often a three-millimeter trimmer potentiometer that nobody thought twice about during the BOM review. The EVM3GSX50B14 — Panasonic's 10 kΩ cermet side-adjust SMD trimmer — occupies precisely that blind spot: small enough to overlook, critical enough to stop a line cold when the reel runs empty.
The passive-component landscape has not settled into predictable rhythms. The late-2025 shock triggered by China's export controls on Nexperia — one of the world's largest suppliers of legacy discrete semiconductors — forced production warnings from Volvo, Volkswagen, and Honda, and the qualification fallout is still reverberating through procurement departments months later, as analyzed here. When passives become allocation-sensitive, even commodity trimmers like EVM3GSX50B14 can shift from overnight shipping to extended wait times without warning. For circuits where calibration access is designed into the enclosure — medical analyzers, industrial sensor front-ends, laser driver bias networks — a redesign cycle isn't an option when the trimmer goes missing from the approved vendor list.
This means the EVM3GSX50B14 datasheet is not just a reference document. It is the first line of defense for verifying that the part on your desk matches the part on your schematic — and that the part you can actually buy matches both. The following sections break down the pinout, key electrical specifications, comparison with mechanically similar alternatives, and sourcing practices that separate a production-ready BOM line from a line-down event.
EVM3GSX50B14 Pin-by-Pin: What the Datasheet Says About This 10 kΩ Side-Adjust Trimmer
The EVM3GSX50B14 is a single-turn, cermet-element, side-adjust SMD trimmer potentiometer in Panasonic's EVM3G series. Its 3-terminal configuration follows the standard voltage-divider topology: two fixed ends of a resistive track and a sliding wiper that taps any point between them. Understanding the pin assignment is non-negotiable before placing the footprint — reversing the CCW and CW terminals will invert the adjustment direction and may confuse production calibration procedures.
The EVM3GSX50B14(10K) datasheet establishes the terminal numbering convention, and the Win Source pinout image provides a visual cross-reference that confirms the orientation. When viewing the adjustment side — the face where the screwdriver slot is exposed — pin 1 is the counter-clockwise (CCW) end of the resistive element, pin 2 is the wiper output, and pin 3 is the clockwise (CW) end. The wiper moves toward pin 3 as you rotate the adjustment clockwise. A close EVM3ESX50B14 reference — the top-adjust sibling — shares the same internal topology, so the pinout logic carries across the EVM3 family.
The SMD footprint measures approximately 3.1 × 3.8 mm with a 1.62 mm seated height, making it compatible with tight enclosures where top-access is impractical. Engineers should note what Ultra Librarian's datasheet guide emphasizes: the manufacturer-recommended land pattern directly impacts solder joint reliability. A footprint pulled from a generic 3-pin trimmer library may not match the Panasonic pad geometry, leading to tombstoning or insufficient fillet formation during reflow.
Tip: Before releasing the layout, overlay the Panasonic recommended land pattern from the official datasheet onto your CAD library footprint. Even a 0.2 mm pad-width discrepancy can shift the part during reflow and make side-access alignment unreliable when the enclosure slot must line up perfectly with the adjustment screw.
| Parameter | Value/Range | Unit/Notes |
|---|---|---|
| Manufacturer Part Number | EVM3GSX50B14 | Panasonic EVM3G Series |
| Resistance (End-to-End) | 10 | kΩ, ±25% tolerance |
| Power Rating | 0.15 | W at 70°C; derate above 70°C |
| Element Type | Cermet | Thick-film on ceramic substrate |
| Number of Turns | 1 (Electrical), 1 (Mechanical) | Approx. 260° electrical travel |
| Adjustment Orientation | Side-adjust | Screwdriver slot on package side face |
| Package Dimensions (L × W × H) | 3.1 × 3.8 × 1.62 | mm; SMD gull-wing terminals |
| Temperature Coefficient | ±250 | ppm/°C (typical for cermet) |
| Operating Temperature Range | -40 to +100 | °C |
| Residual Resistance (Wiper) | ≤1% or 2 Ω (whichever greater) | Per Panasonic EVM3 series spec |
| Sealing | Sealed construction | Suitable for flow/reflow soldering; not immersion-washable without verification |
| Packaging | Tape and Reel | Standard 330 mm (13-inch) reel |
Several parameters in this table deserve engineering attention beyond the headline resistance value. The ±25% tolerance on the 10 kΩ end-to-end resistance is generous by fixed-resistor standards, but this is a trimmer — you are not buying a precise absolute value. You are buying a ratio. The wiper can be positioned anywhere from near 0 Ω to the actual end-to-end resistance, so a 7.5 kΩ actual element still delivers a full 0-to-7.5 kΩ adjustment range. The ±250 ppm/°C temperature coefficient matters if the trimmer sits in a gain-setting network where drift translates directly to measurement error. In a 10 kΩ feedback path with a 30°C ambient swing, you can expect roughly 75 Ω of drift — negligible in many bias circuits but worth modeling in precision analog front-ends.
The 0.15 W power rating at 70°C is adequate for low-level signal paths; however, if your trimmer carries DC bias current, calculate I²R dissipation carefully. At 10 kΩ, 0.15 W corresponds to approximately 3.9 mA through the full element — a limit that can be approached in sensor excitation circuits where the trimmer doubles as a current-limiting element.
Side-Adjust or Top-Adjust? Weighing EVM3GSX50B14 Against EVM3E and Bourns Equivalents
Panasonic offers the EVM3GSX50B14 as the side-adjust variant within the EVM3 family, while the EVM3ESX50B14 provides identical electrical performance with top-adjust access. The mechanical difference is decisive: side-adjust trimmers let you calibrate through a slot in the enclosure wall without removing the cover, while top-adjust parts require perpendicular access. In a 1U rack-mount chassis or a sealed handheld instrument, this single factor often dictates the entire BOM decision.
The Bourns 3314J-1-103E appears frequently in parametric searches as a 10 kΩ SMD trimmer of similar dimensions, and buyers may be tempted to treat it as interchangeable. The datasheets tell a more nuanced story. Bourns specifies the 3314J series with a 4.5 × 4.5 mm footprint — considerably larger than the 3.1 × 3.8 mm of the EVM3GSX50B14. The adjustment orientation and mechanical travel also differ. Treating the Bourns part as a drop-in replacement without a side-by-side land pattern overlay and a mechanical interference check in CAD is a fast path to a board spin.
Pricing intelligence from DigiPart shows that distributor spreads for the EVM3GSX50B14 can vary significantly depending on whether the stock originates from franchised distribution or independent surplus channels. The Win Source listing does not include a factory-authorized drop-in replacement; pin-compatible alternatives should be evaluated for mechanical compatibility and calibration impact before approval.
| Comparison Metric | Panasonic EVM3GSX50B14 | Panasonic EVM3ESX50B14 | Bourns 3314J-1-103E | Selection Criteria & Failure Boundary |
|---|---|---|---|---|
| Resistance | 10 kΩ ±25% | 10 kΩ ±25% | 10 kΩ ±20% | Both meet 10 kΩ nominal; Bourns offers tighter absolute tolerance |
| Adjustment Orientation | Side-adjust | Top-adjust | Top-adjust | Side-access enclosures mandate EVM3GS; top-access favors EVM3ES or Bourns |
| Package (L × W mm) | 3.1 × 3.8 | 3.1 × 3.8 | 4.5 × 4.5 | Bourns requires ~60% more board area; verify CAD clearance |
| Element Type | Cermet | Cermet | Cermet | Equivalent material; similar noise and stability characteristics |
| Power Rating (W) | 0.15 | 0.15 | 0.25 | Bourns has higher power headroom; verify if I²R approaches 0.15 W |
| Temp Coefficient | ±250 ppm/°C | ±250 ppm/°C | ±100 ppm/°C | Bourns offers better thermal stability for precision circuits |
| Mechanical Turns | 1 | 1 | 1 | Single-turn resolution comparable; multi-turn not available in this form factor |
| Land Pattern Compatibility | Baseline (Panasonic pad set) | Identical to EVM3GS | Different — requires layout change | Verify footprint overlay before approving Bourns as alternate |
The table highlights a critical procurement decision point: electrical equivalence does not guarantee mechanical equivalence. If your board already carries the EVM3GSX50B14 land pattern, switching to the Bourns 3314J-1-103E means a PCB revision. If your enclosure has a side-access calibration port, switching to the EVM3ESX50B14 top-adjust variant means the technician cannot reach the trimmer without opening the housing. These are not hypothetical failure modes — they are the difference between a five-second calibration and a field-service call.
For engineers starting a new design, the selection logic should flow from the enclosure access path first, then the available board real estate, and only then the electrical parameters. A side-adjust trimmer on a board with no side-access slot wastes the primary advantage of the EVM3GSX50B14. A top-adjust part in a sealed box with only a side port is unadjustable in the field. Match the mechanical axis to the service procedure.
Sourcing EVM3GSX50B14 Without a Production Hiccup: Stock Layers, Date Codes, and BOM Risk
When a trimmer as specialized as the EVM3GSX50B14 appears in a production BOM, procurement teams face a dual challenge: the part is not always stocked in depth at major franchised distributors, and the independent surplus channel contains mixed-date-code inventory that demands scrutiny. Navigating this landscape without triggering a line stoppage requires a disciplined qualification workflow.
The date code on a reel tells a story that matters for reflow yield. Consider the Worldway listing showing date code 1707+ — stock manufactured in July 2017. An eight-year-old SMD component is not automatically suspect, but it does demand verification. Cermet trimmers are mechanically robust and do not degrade like electrolytic capacitors, but the terminal solderability can degrade if the packaging seal was compromised or storage conditions were uncontrolled. For parts approaching a decade from date of manufacture, request a solderability test report or perform an in-house wetting balance test on a sample before committing a full reel to the production floor.
The broader supply-chain context makes this diligence more urgent. As the 2026 component shortage analysis documents, legacy passives — even those that have been in production for decades — can transition into allocation status when upstream materials or manufacturing capacity tighten. A BOM line that depends on a single trimmer SKU without a qualified alternate is exposed to a single-point-of-failure risk that no amount of buffer stock can permanently solve.
Key Takeaway: Verify single-source risk through manufacturer and distributor documentation. Panasonic's EVM3 series remains in active production, but the specific 10 kΩ side-adjust variant may not be stocked at the same depth as the more common top-adjust versions. Treat supply as allocation-sensitive and confirm current availability via RFQ.
| Sourcing Checkpoint | What to Verify | Red Flags | Recommended Action |
|---|---|---|---|
| Distributor Authorization | Franchised vs. independent status for Panasonic passives | Seller claims "factory-new" but cannot provide Panasonic packing slip | Cross-reference with Panasonic's authorized distributor list; prefer franchised for production volumes |
| Date Code & Lot Traceability | Reel label photograph showing date code, lot number, and quantity | Label appears relabeled, date code is obscured, or lot number doesn't match Panasonic format | Request original Panasonic label image; decline if seller refuses |
| Moisture Sensitivity | MSL rating and storage conditions since manufacture | No MSL information; stock stored in non-ESD, non-dry packaging | Bake per J-STD-033 before reflow if moisture exposure is suspected; test solderability on samples |
| Quantity Verification | Exact reel count vs. partial reels | Seller cannot confirm whether the reel is factory-sealed or a cut segment | Require full-reel factory-sealed packaging for production; partial reels acceptable for prototyping only |
| RoHS / Compliance | RoHS compliance for the specific date code | Pre-2016 date codes without explicit RoHS2 or RoHS3 marking | Verify with Panasonic's material declaration for that production period; check your region's exempt substances list |
| Alternate Qualification | Pin-compatible alternate approved in your AVL | Single-source BOM line with no qualified second part | Evaluate EVM3ESX50B14 or Bourns 3314J-1-103E as candidates; verify package, pinout, and firmware/calibration impact before approving |
Procurement teams should build a small safety buffer above the production forecast — not as a permanent solution, but as a bridge that buys time to qualify an alternate if allocation tightens. For the EVM3GSX50B14, a buffer of 15–20% above planned consumption is a reasonable starting point, adjusted upward if the part is sole-sourced and the calibration procedure cannot be adapted to a different trimmer orientation quickly.
When evaluating surplus stock, the single most valuable piece of evidence is a clear photograph of the original Panasonic reel label. The label reveals the manufacturer's internal date code, the factory location, and the lot number — all of which can be cross-referenced against Panasonic's packaging specifications. A seller who cannot or will not provide this photograph should be treated as a higher-risk source, regardless of the quoted price.
EVM3GSX50B14 Design and Sourcing FAQs
Q: How is the EVM3GSX50B14 pinout oriented in the datasheet?
When viewing the adjustment side of the EVM3GSX50B14 — the face with the screwdriver slot — pin 1 is the CCW (counter-clockwise) end of the resistive track, pin 2 is the wiper, and pin 3 is the CW (clockwise) end. Rotating the adjustment clockwise drives the wiper toward pin 3. This convention is documented in the Panasonic EVM3G series footprint drawings and confirmed by the Win Source pinout image. Always orient your schematic symbol and PCB footprint to match this numbering, or the calibration technician will turn the screwdriver the wrong way.
Q: Does the ±25% tolerance mean the 10 kΩ can only be adjusted from 7.5 kΩ to 12.5 kΩ?
No. The ±25% tolerance applies solely to the end-to-end resistance of the fixed resistive element — the total value measured between pin 1 and pin 3. As a trimmer, the wiper (pin 2) can be positioned anywhere along the track, from near 0 Ω (wiper close to one end) to the actual end-to-end resistance value. If your particular EVM3GSX50B14 measures 9.8 kΩ end-to-end, you can adjust the wiper output continuously from approximately 0 Ω to 9.8 kΩ. The absolute tolerance does not limit the adjustment ratio — it only sets the maximum resistance available at the wiper. This is why trimmers are specified for ratiometric applications, not as precision absolute resistors.
Q: Is the wiper isolated from the resistive element at the end stops?
The wiper of the EVM3GSX50B14 does not disconnect from the resistive element at the mechanical end stops. It remains in continuous electrical contact, so there is no open-circuit condition at the extremes of rotation. If your circuit design requires a definite "off" or high-impedance state at one end of the adjustment range, include a series resistor between the wiper output and the following stage to establish a minimum resistance floor. Do not rely on the trimmer to provide galvanic isolation or a true open circuit.
Q: How should I verify a date code like 1707+ from an independent distributor?
Start by requesting a high-resolution photograph of the original Panasonic reel label. The label should show the manufacturer's date code (in Panasonic's format), the lot number, the part number, and the quantity. Compare the date code format against Panasonic's known packaging conventions — legitimate labels follow a consistent structure. For stock from 2017, such as the 1707+ batch listed at Worldway, additional checks are warranted: verify the moisture sensitivity level (MSL) rating for the EVM3 series and determine whether a pre-reflow bake is necessary per J-STD-033 guidelines. Finally, perform sample solderability testing — a wetting balance test on a few parts pulled from the reel provides empirical confidence in the terminal finish before the entire reel reaches the pick-and-place machine.
Q: Who are the authorized global distributors for Panasonic potentiometers, and what's the typical lead time for EVM3GSX50B14?
Digi-Key, Mouser, and Farnell (Newark in North America) are Panasonic's franchised distribution partners for passive components and typically carry the broader EVM3 series. However, the EVM3GSX50B14 — the side-adjust 10 kΩ variant — may not be stocked continuously at all three. Availability fluctuates based on Panasonic's production scheduling. In recent quarters, lead times for non-stocked EVM3 variants have stretched beyond 20 weeks. Rather than relying on broker stock levels displayed on aggregation sites, confirm allocation-backed lead time directly with a franchised distributor. A quote that looks attractive on an independent platform may represent unavailable inventory when you attempt to place a firm order.
Q: Can I drop in a Bourns 3314J-1-103E as a substitute without layout changes?
Not without verification. The Bourns 3314J-1-103E is a 10 kΩ cermet SMD trimmer, but its 4.5 × 4.5 mm footprint is substantially larger than the 3.1 × 3.8 mm EVM3GSX50B14 package, and the Bourns part is a top-adjust design. Even if you have top-access clearance, the land pattern will not match without a PCB revision. Additionally, the adjustment orientation logic may differ — what constitutes clockwise on the Bourns part may not correspond to the same wiper direction on the Panasonic part. Before approving any alternate, overlay the manufacturer-recommended land patterns side by side in your CAD tool, simulate mechanical interference with the enclosure, and update the calibration procedure to reflect any adjustment-direction changes. Evaluate the Bourns part as a candidate — but verify package, pinout, and firmware or calibration impact before releasing the change order.
References & Further Reading
- EVM3GSX50B14(10K) Datasheet — Worldway Electronics
- EVM3GSX50B14 Pinout, Datasheet, and Application — Win Source
- EVM3GSX50B14 Stock Listing with Date Code 1707+ — Worldway
- EVM3ESX50B14 Datasheet PDF & Technical Specs — Datasheets.com
- EVM3GSX50B14 Price & Stock Across Distributors — DigiPart
- Electronic Component Datasheets: A Guide for PCB Design — Ultra Librarian
- Shortage of Electronic Components in 2026: Causes and Sourcing Strategies — NextPCB
- IC-Online — RFQ and BOM Sourcing Platform
Conclusion
The EVM3GSX50B14 occupies a niche that its datasheet alone cannot fully capture: a 3-mm side-adjust cermet trimmer whose mechanical access path dictates whether a production calibration takes seconds or requires a teardown. For design engineers, the priority is matching the adjustment orientation to the enclosure and verifying that the land pattern comes from Panasonic's official documentation — not a generic library footprint. For procurement, the priority is distinguishing franchised stock from surplus inventory with unverified date codes and qualifying a mechanically vetted alternate before allocation pressure forces a rushed decision.
The electrical specifications — 10 kΩ ±25%, 0.15 W, ±250 ppm/°C — are modest by precision analog standards, but they are entirely adequate for the bias, offset-null, and gain-trim applications that keep this part in active design-ins. What distinguishes a smooth production run from a line stoppage is not the trimmer's tolerance band; it is whether the sourcing team confirmed availability, authenticated the date code, and built a buffer that covers the gap between order placement and reel delivery. In a supply environment where even legacy passives can become allocation items overnight, the EVM3GSX50B14 rewards the engineer who reads the datasheet carefully — and the buyer who treats every surplus reel as unverified until proven otherwise.
Need to secure the EVM3GSX50B14 for an upcoming production run or qualify an alternate for a legacy design? Request a quote or upload your BOM on IC-Online — the platform handles mixed BOMs with flexible MOQ requirements and connects you with verified supplier options without locking you into a single channel. Confirm current availability and allocation-backed lead time with a single RFQ.
