3142W502P - 5kΩ 0.15W SMD Cermet Trimmer Potentiometer | TE Connectivity
MPN： 3142W502P ✓ 啟用中3142W502P 概覽
A trimmer potentiometer (also called a trim pot, preset resistor, or trimming potentiometer) is a small adjustable resistor used for fine-tuning, calibration, or bias adjustment on a printed circuit board. Once the desired resistance is set during manufacturing or field calibration, the part is typically left in position - unlike a panel-mounted potentiometer that is user-actuated. Trimmers sit at the bottom of the variable-resistor hierarchy: potentiometer -> variable resistor -> passive adjustable component -> passives. They are categorized alongside rotary encoders and potentiometers under the broader electromechanical/passive component family.
Key specifications include 5 kΩ nominal resistance with ±10% or ±20% tolerance (per datasheet), 0.15 W power dissipation at 70 °C, 200 cycles of rotational life for cermet versions, and a top-adjustment rotor orientation (the screw slot faces upward after PCB mounting). The cermet element provides excellent temperature stability (typically ±100 ppm/°C TCR) and low resistance drift compared to carbon-film alternatives.
The 3142W family is housed in a 4 mm × 4.5 mm J-lead SMD package compatible with the industry-standard footprint used by many competitors. The J-lead geometry provides mechanical compliance that absorbs TCE stress between the part and the PCB, improving solder-joint reliability versus rigid gull-wing leads on larger ceramic chip resistors.
Typical applications include gain trimming in op-amp circuits, voltage reference calibration in ADC reference ladders, LCD contrast adjustment, threshold setting in comparator circuits, sensor bridge nulling, and power-supply voltage fine-tuning. The 5 kΩ value is particularly useful as a low-impedance bias divider or feedback resistor in instrumentation amplifiers.
When designing with this trimmer, ensure the adjustment torque is applied with a proper trimmer tool (not a metal screwdriver, which can damage the rotor) and that the operating temperature remains within -55 °C to +125 °C. For high-humidity environments, consider sealed rotor trimmers to prevent moisture ingress into the cermet element.
This page synthesizes distributor stock levels, parametric substitutes in the same 3142W J-lead family, and practical PCB layout advice not found in the manufacturer datasheet.
直接替換替代品，適用於 3142W502P — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
3142W102P
✅ 直接替換📋 參考替代品（不在目錄中）
3142W202P
✅ 直接替換📋 參考替代品（不在目錄中）
3142W103P
✅ 直接替換📋 參考替代品（不在目錄中）
3314J-1-502E
✅ 直接替換📋 參考替代品（不在目錄中）
TS53YL502MR10
✅ 直接替換📋 參考替代品（不在目錄中）
3142W502P 最大額定值與電氣特性
| Manufacturer | TE Connectivity |
| Manufacturer Part Number | 3142W502P |
| Series | 3142W |
| Resistance | 5 kOhm |
| Power Rating | 0.15 W (1/7 W) |
| Resistive Element Material | Cermet |
| Number of Turns | 1 Turn (Single-Turn) |
| Adjustment Type | Top Adjustment |
| Adjustment Location | Top (rotor slot faces upward after mounting) |
| Termination Style | J Lead (SMD) |
| 安裝類型 | Surface Mount |
| 工作溫度 | -55 °C to +125 °C |
| Rotational Life | 200 cycles (cermet) |
| TCR (Temperature Coefficient) | ±100 ppm/°C (typical for cermet) |
| RoHS 狀態 | Compliant |
| Lead Free | Yes |
| MSL 等級 | 1 (unlimited) |
| Packaging | Tape & Reel |
3142W502P standard 腳位配置指南
3142W502P（standard 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： 3142W502P.
請參閱 資料表 以查看完整腳位配置。
典型應用
3142W502P 適用於 8 應用s: Op-Amp Gain Trimming, ADC Voltage Reference Calibration, LCD Contrast / Bias Adjustment, Comparator Threshold Setting, Sensor Bridge Nulling, Switching Power Supply Voltage Trim, Audio Tone Control Bias, Test & Measurement Calibration.
Op-Amp Gain Trimming
The 3142W502P provides 5 kΩ adjustable resistance in op-amp inverting and non-inverting gain stages where factory calibration of closed-loop gain is required. Its 0.15 W rating comfortably exceeds dissipation at typical 5 V supply rails with mA-class signal currents. The cermet element delivers ±100 ppm/°C TCR for thermally stable gain over -55 °C to +125 °C operating range. Placed in the feedback loop, the trimmer allows fine adjustment of closed-loop gain to within ±1% of target after automated test calibration.
推薦
ADC Voltage Reference Calibration
The 3142W502P serves as a calibration element in ADC reference ladders and external reference dividers where fine adjustment of full-scale or zero-scale voltage is required. At 5 kΩ with the wiper positioned mid-rotation, it provides a low-impedance divider that does not load reference ICs. The single-turn resolution (~50 Ω per degree) suits 10-12 bit ADC calibration, while the J-lead SMD package fits dense ADC front-end layouts. After factory trim, the part is locked in position and not readjusted in the field.
推薦
LCD Contrast / Bias Adjustment
The 3142W502P is used in character and graphic LCD module bias networks to set the V0 contrast voltage, typically through a voltage divider between VCC and VEE. The 5 kΩ value provides a low-impedance divider that prevents bias drift as the LCD supply current varies with displayed content. Top-adjust rotor orientation allows access through the front panel after PCB assembly without disassembly. The cermet element stability ensures contrast does not shift across the operating temperature range of the LCD.
推薦
Comparator Threshold Setting
The 3142W502P sets the reference threshold voltage on comparator inputs used for sensor level detection, battery voltage monitoring, and overcurrent protection circuits. The 5 kΩ value is convenient for a divider from a 3.3 V or 5 V supply, and the 0.15 W rating easily handles the steady-state divider current of ~1 mA. Single-turn adjustment permits factory-set thresholds without field calibration, while the J-lead SMD package survives automotive underhood thermal and vibration stress in AEC-Q100 qualified comparator circuits.
推薦
Sensor Bridge Nulling
The 3142W502P is placed in the null-balance arm of a Wheatstone bridge sensor (strain gauge, load cell, pressure sensor) to cancel the bridge offset voltage at zero stimulus. At 5 kΩ, the trimmer impedance matches typical 1-10 kΩ bridge arms, minimizing loading error. Single-turn adjustment resolution (~0.5% of full scale per degree) is sufficient for nulling to within ±10 mV at 5 V excitation. The cermet element's low thermal drift keeps the null stable across the operating temperature range.
推薦
Switching Power Supply Voltage Trim
The 3142W502P provides final output voltage calibration in isolated and non-isolated DC-DC converters and LDO post-regulators where the feedback divider must be fine-tuned to compensate for reference tolerance and transformer winding ratio error. At 5 kΩ in the upper leg of a feedback divider, it sets the trim range to typically ±5% of nominal output. The 0.15 W rating is adequate for low-power feedback networks, and the top-adjust rotor allows post-assembly voltage calibration without PCB rework.
推薦
Audio Tone Control Bias
The 3142W502P is used in analog audio tone-control and Baxandall bass/treble networks to set the midpoint bias of active filter stages. The 5 kΩ value is the historical standard for tone-control potentiometers because it provides good audio frequency response without loading the op-amp output stage. Cermet element provides low noise (better than carbon film) for clean audio performance, and the J-lead SMD package fits consumer audio amplifier boards where through-hole pots are too tall for slim chassis designs.
推薦
Test & Measurement Calibration
The 3142W502P is used in bench test equipment, calibration fixtures, and laboratory instrumentation for in-board calibration of analog signal paths, gain stages, and reference voltages. The single-turn top-adjust rotor permits fast manual calibration during test, and the 0.15 W rating suits signal-level circuitry. The cermet element provides the long-term stability required for NIST-traceable test equipment, and the J-lead SMD package integrates cleanly into mixed-technology boards with both through-hole connectors and SMT ICs.
推薦
推薦產品摘要
工程參考資料，適用於 3142W502P — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 3142W102P | 3142W202P | 3142W103P | 3314J-1-502E | TS53YL502MR10 |
|---|---|---|---|---|---|---|
| Brand | TE Connectivity | TE Connectivity | TE Connectivity | TE Connectivity | Bourns | Vishay |
| Package | J-lead SMD 4x4.5mm (3142W series) | J-lead SMD 4x4.5mm (3142W series) - same | J-lead SMD 4x4.5mm (3142W series) - same | J-lead SMD 4x4.5mm (3142W series) - same | J-lead SMD 4x4.5mm (3314J series) - same footprint | J-lead SMD 5x5mm (TS53 series) - same form factor |
| Resistance | 5 kOhm | 1 kOhm | 2 kOhm | 10 kOhm | 5 kOhm | 5 kOhm |
| Power Rating | 0.15 W | 0.15 W | 0.15 W | 0.15 W | 0.25 W | 0.25 W |
| Number of Turns | 1 Turn | 1 Turn | 1 Turn | 1 Turn | 1 Turn | 1 Turn |
| Adjustment Type | Top Adjustment | Top Adjustment | Top Adjustment | Top Adjustment | Top Adjustment | Top Adjustment |
| Element Material | Cermet | Cermet | Cermet | Cermet | Cermet | Cermet |
| Rotational Life | 200 cycles | 200 cycles | 200 cycles | 200 cycles | 100 cycles | 100 cycles |
| Operating Temperature | -55 °C to +125 °C | -55 °C to +125 °C | -55 °C to +125 °C | -55 °C to +125 °C | -55 °C to +125 °C | -55 °C to +125 °C |
| Approx. Unit Price (qty 100) | $0.52 | $0.52 | $0.52 | $0.52 | $0.45 | $0.60 |
主要差異化特點
- J-lead SMD package with mechanical compliance for solder-joint reliability (對比Through-hole 3296W-502 family)
- TE Connectivity brand with broad distribution and AEC-Q100 capable variants in family (對比Generic no-name equivalent trimmers)
- Same 4 mm × 4.5 mm J-lead footprint as Bourns 3314J and Vishay TS53 (對比Proprietary non-standard trimmer footprints)
設計說明
Do not use a metal screwdriver to adjust the 3142W502P - the metal tip can short the wiper to the rotor face and damage both the cermet element and any live circuit connected to the wiper. Always use a plastic or ceramic-tipped trimmer tool (e.g., Murata/Tools TR-2 or equivalent). Apply gentle torque within the 20-200 gf·cm range; excessive force cracks the rotor housing or bends the J-leads. After adjustment, do not reflow the part - the plastic housing softens above 200 °C and rotor position may shift during the second reflow cycle.
Use the recommended PCB land pattern from the TE Connectivity 3142W series datasheet: 5 mm × 5 mm overall, with three pads of 1.5 mm × 1.0 mm for the J-lead terminations. The land pattern is mechanically compatible with Bourns 3314J and Vishay TS53 J-lead series, enabling dual-sourcing without board redesign. Place a small keep-out zone under the rotor slot to allow access from the top side after PCB assembly, and route wiper traces away from high-impedance op-amp inputs to avoid noise injection.
Estimated: at maximum 0.15 W dissipation in still air at 25 °C, the 3142W502P junction-to-ambient thermal resistance of approximately 200 °C/W results in a 30 °C temperature rise above ambient. Derate linearly to zero power at 125 °C per cermet trimmer standard derating curves. For continuous operation near the 0.15 W limit, provide copper pours on adjacent layers to spread heat. The cermet element itself tolerates brief soldering reflow at 260 °C peak for 10 seconds, but the plastic rotor housing must be kept below 200 °C after adjustment to preserve rotor position.
Orient the 3142W502P so the rotor slot faces the accessible side of the enclosure for post-assembly adjustment. For factory-only calibration, orientation is less critical, but always place the trimmer clear of tall components (electrolytic caps, transformers) that would block access. Keep high-current traces (motor drivers, relay coils, LED strings) more than 5 mm away from the trimmer body to avoid thermal drift during adjustment from heating of nearby components.
合規資訊
RoHS compliance per TE Connectivity product page; lead-free terminations; AEC-Q100 qualification not specifically claimed for 3142W502P - check TE Connectivity automotive product line for AEC-Q100 qualified trimmers if automotive grade is required. REACH compliance inferred from TE Connectivity corporate policy.
