3299W-1-501LF - 500Ω, 0.5W, 25-Turn Trimmer | Bourns
MPN: 3299W-1-501LF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
3299W-1-501LF Overview
A trimming potentiometer, or trimpot, is a variable resistor used to set a circuit parameter close to its final value. The 3299W series belongs to the passive-component hierarchy: potentiometer → variable resistor → resistor → electronic component. Its cermet element and multi-turn adjustment mechanism provide a practical compromise between adjustment precision, resistance stability, and through-hole PCB assembly. The 3299W-1-501LF is suited to calibration points rather than continuously variable user controls.
The verified product data specifies 500 ohms of nominal resistance, 0.5 W power rating, 25 electrical turns, vertical adjustment, and a 3/8-inch square form factor. The Arrow listing gives the mechanical dimensions as 9.53 mm by 6.1 mm by 11.55 mm. The JLCPCB listing additionally reports ±10% resistance tolerance and a ±100 ppm/°C temperature coefficient. These values should be checked against the manufacturer's datasheet for the exact test conditions and lot-specific limits.
Use the three through-hole leads for the two resistive endpoints and the wiper. Because the adjustment is vertical and top-facing, the component is accessible after soldering and can be calibrated with a fine screwdriver. The 25-turn range makes each incremental movement small, which is useful in analog signal conditioning, threshold calibration, reference-voltage adjustment, and feedback-network tuning. It is not intended as a power-resistor substitute or as a high-current rheostat.
The principal design consideration is mechanical stability. Mount the trimmer on a supported PCB area, avoid force on the adjustment screw during soldering or enclosure assembly, and calibrate only after the surrounding circuit reaches its normal operating condition. Verify the wiper position and resistance direction with an ohmmeter before applying power. The Bourns 3299W-1-501LF is appropriate when a compact, vertical, multi-turn calibration element is required and a through-hole footprint is available.
This page combines the verified distributor and manufacturer-source information with application guidance, alternative-selection cautions, and practical PCB-use notes to support faster engineering decisions.
Drop-in alternatives for 3299W-1-501LF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
3292W-1-501LF
✅ Drop-In📋 Reference alternative (not in catalog)
3339S-1-501LF
✅ Drop-In📋 Reference alternative (not in catalog)
68WR500/3299W-1-501LF/VP
✅ Drop-In📋 Reference alternative (not in catalog)
3299W-1-501LF Maximum Ratings & Electrical Characteristics
| Nominal Resistance | 500 ohm |
| Power Rating | 0.5 W |
| Electrical Turns | 25 turns |
| Adjustment Orientation | Vertical, top adjustment |
| Resistance Tolerance | ±10% |
| Temperature Coefficient | ±100 ppm/°C |
| Package Type | 3/8-inch square trimming potentiometer |
| Mounting Type | Through-hole PC pins |
| Element Type | Cermet |
| Lead Configuration | Three leads: two endpoints and wiper |
| Mechanical Dimensions | 9.53 mm × 6.1 mm × 11.55 mm |
| RoHS Status | Compliant |
| AEC-Q100 Qualification | Not applicable |
| Standard Product | 3299 series |
3299W-1-501LF 3/8-inch square trimming potentiometer Pin Configuration Guide
Pin configuration for 3299W-1-501LF (3/8-inch square trimming potentiometer package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for 3299W-1-501LF.
Refer to the datasheet for full pin configuration.
Typical Applications
3299W-1-501LF is suitable for 6 applications: Analog Feedback Calibration, Sensor Signal Conditioning, Reference Voltage Adjustment, Instrumentation Calibration Boards, Threshold and Comparator Circuits, Low-Power Control Adjustments.
Analog Feedback Calibration
The Bourns 3299W-1-501LF fits analog feedback networks where an engineer needs to calibrate gain, offset, or current-limit behavior after assembly. Its 500 ohm nominal resistance provides a defined adjustment range, while 25 electrical turns reduce the wiper movement required for a small calibration change. Mount it vertically so the top adjustment remains accessible, connect the two fixed terminals across the resistive element and the wiper to the feedback node, and verify the adjustment range with the circuit powered and settled. The 0.5 W rating is relevant only when the resistor element dissipation is checked against the actual bias and signal conditions.
Recommended
Sensor Signal Conditioning
Use the 3299W-1-501LF to trim offset or sensitivity in a resistive sensor interface when a fine adjustment is preferable to a single-turn potentiometer. The 500 ohm element and 25-turn range are useful for setting a threshold or correcting a small sensor-circuit mismatch, while the cermet construction supports a compact through-hole implementation. Place the wiper near the signal-conditioning input and keep the adjustment mechanism mechanically isolated from vibration-sensitive assemblies. Calibration should be repeated after thermal stabilization because the verified listing specifies a temperature coefficient of ±100 ppm/°C.
Recommended
Reference Voltage Adjustment
The 3299W-1-501LF can adjust a small reference or threshold voltage in an analog control board. Its 25-turn travel allows a technician to make incremental changes without disturbing the wiper contact substantially, and the 500 ohm nominal value is appropriate for divider-based networks. Connect the part as a three-terminal potentiometer, confirm the wiper voltage with a high-impedance meter, and adjust only within the circuit's specified input and power limits. The through-hole 3/8-inch square format simplifies hand assembly and rework, but the exact lead spacing must match the PCB footprint.
Recommended
Instrumentation Calibration Boards
Instrumentation boards often require a small, serviceable calibration adjustment rather than a user-facing rotary control. The Bourns 3299W-1-501LF provides 25 electrical turns, a 500 ohm nominal resistance, and a 0.5 W rating for fine calibration in measurement and control circuits. Its top-facing adjustment screw allows calibration without changing the board layout, while the vertical orientation helps technicians reach the control after enclosure assembly. Use a mechanical stop or marking to prevent accidental movement, and verify calibration after the enclosure reaches its operating temperature.
Recommended
Threshold and Comparator Circuits
A 3299W-1-501LF is useful for setting a comparator or switching threshold when the circuit needs a fine adjustment range. The 25-turn element gives better control than a common single-turn trimmer, and the 500 ohm value can be used in a conventional resistor-divider arrangement. Connect the wiper to the comparator input or threshold node, keep the signal current low enough to avoid loading the divider, and avoid allowing the adjustment to exceed the input range of the surrounding device. Confirm the final threshold with the complete load and supply conditions.
Recommended
Low-Power Control Adjustments
The 3299W-1-501LF can provide a stable calibration control in low-power analog or industrial control boards. Its 0.5 W power rating provides a stated upper limit for the resistive element, but the actual operating dissipation depends on the applied voltage and wiper position. The multi-turn adjustment reduces sensitivity to small mechanical movements and helps preserve calibration during handling. Provide adequate clearance around the adjustment screw, avoid placing it where an enclosure presses against the mechanism, and use the manufacturer datasheet to verify environmental and electrical limits.
Recommended
Engineering reference data for 3299W-1-501LF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 3292W-1-501LF | 3339S-1-501LF | 68WR500/3299W-1-501LF/VP |
|---|---|---|---|---|
| Nominal Resistance | 500 ohm | 500 ohm | 500 ohm | 500 ohm |
| Package | 3/8-inch square through-hole trimming potentiometer | 3/8-inch square through-hole trimming potentiometer | 3/8-inch square through-hole trimming potentiometer | 3/8-inch square trimming potentiometer |
| Brand | Bourns | Bourns | Bourns | BI Technologies |
Key Differentiators
- Higher stated power rating in the related alternative listing (vs 68WR500/3299W-1-501LF/VP)
- Same-brand 500 ohm family simplifies resistance matching (vs 3292W-1-501LF)
- Directly verified 25-turn adjustment specification (vs 3339S-1-501LF)
Design Notes
Confirm the mechanical drawing before laying out the PCB. The verified target data identifies a 3/8-inch square, three-pin through-hole package, but does not provide the exact lead spacing or pin-number orientation. Reserve clearance around the vertical adjustment screw and keep nearby components from preventing access after soldering.
Do not treat the 0.5 W rating as the operating power limit without checking the actual voltage across the resistive element. The target is a 500 ohm, 25-turn calibration component, and excessive wiper movement into a biased network can change both resistance and dissipated power. Verify the circuit's worst-case voltage, current, and wiper position before final calibration.
Place the trimmer near the feedback or threshold node only as far as required, while keeping the wiper trace short and away from noisy switching nodes. Use a stable ground reference and avoid routing high-current paths through the same region. After enclosure assembly, mark or lock the adjustment position so vibration does not change the calibrated value.
Compliance Information
The verified JLCPCB listing marks the target RoHS compliant. No verified REACH, halogen-free, conflict-minerals, or AEC-Q100 data was supplied. The related IC-online snippet mentions lead-free construction for the target, but the product listing data is the controlling source and the manufacturer datasheet should be checked for formal declarations.
