Honeywell 343P100K Trimmer Potentiometer: Equivalent & Substitute Parts

Part Overview

The Honeywell 343P100K is a 100 kOhm, 0.75W through-hole trimmer potentiometer with cermet resistive material, featuring 20-turn side adjustment and PC pin termination. This component is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical performance specifications while accommodating modern component availability and compliance requirements.

Substiute Parts

343P100K

Honeywell Sensing and Productivity SolutionsIn Stock: 876343P100K Datasheet

Current PartRFQ

3006P-1-104

Bourns Inc.In Stock: 42443006P-1-104 Datasheet

SimilarRFQ

89PR100KLF

TT Electronics/BIIn Stock: 197289PR100KLF Datasheet

SimilarRFQ

90PR100KLF

TT Electronics/BIIn Stock: 105390PR100KLF Datasheet

SimilarRFQ

M43P104KB40

Vishay SpectrolIn Stock: 2487M43P104KB40 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Resistance value: 100 kOhms
• Power rating: 0.75W
• Tolerance: ±10%
• Temperature coefficient: ±100ppm/°C
• Adjustment type: Side Adjustment
• Resistive material: Cermet
• Mounting type: Through Hole
• Termination style: PC Pins

Allowable Variation Parameters:

• Number of turns: 15–20 turns (affects adjustment resolution and speed)
• Face dimensions: Minor variations within 0.250" ± 0.010" x 0.190" ± 0.010" (6.35mm ± 0.25mm x 4.83mm ± 0.25mm)
• Product status: Active preferred; obsolete acceptable only for legacy applications
• RoHS compliance: Preferred but not mandatory for retrofit applications
• Packaging format: Tube or Bulk

Four active substitute parts meet these criteria and are listed below.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

89PR100KLF and 90PR100KLF (TT Electronics/BI Series 89) are the closest functional equivalents. Both maintain the 20-turn specification of the original 343P100K, ensuring identical adjustment resolution. Both are RoHS Compliant and carry unlimited moisture sensitivity rating (MSL 1). The primary design consideration is the larger face dimension (0.750" x 0.190" versus 0.250" x 0.190"), which requires verification of available PCB space. These parts are active products with strong inventory availability.

Secondary Substitute (Minor Parameter Deviation):

M43P104KB40 (Vishay Spectrol Series 43) provides active product status with RoHS3 compliance. The 18-turn specification represents a minor deviation from the 20-turn original, resulting in slightly faster adjustment speed (approximately 10% faster per full rotation). Face dimensions (0.252" x 0.189") are nearly identical to the original. This part is suitable for applications where turn count variation is acceptable.

Alternative Substitute (Compliance Trade-off):

3006P-1-104 (Bourns Trimpot® 3006 Sealed) is available in high inventory but carries RoHS non-compliance status and REACH-affected designation. The 15-turn specification represents a more significant deviation, resulting in approximately 25% faster adjustment speed. This part is suitable only for legacy applications or where RoHS compliance is not required. The sealed design provides enhanced environmental protection.

Recommendation for New Designs: Use 89PR100KLF or 90PR100KLF. Verify PCB layout accommodates the 0.750" face width. For space-constrained designs, M43P104KB40 is acceptable with documented turn-count variance.

Frequently Asked Questions (FAQ)

Q: Can I use 3006P-1-104 as a direct replacement for 343P100K in a new RoHS-compliant design?

A: No. The 3006P-1-104 is RoHS non-compliant and REACH-affected. Use 89PR100KLF, 90PR100KLF, or M43P104KB40 for RoHS-compliant designs.

Q: What is the impact of the 15-turn specification in the Bourns 3006P-1-104 compared to the 20-turn original?

A: The 15-turn design requires approximately 25% fewer rotations to traverse the full resistance range, resulting in faster adjustment speed. This affects tuning sensitivity and may require recalibration procedures in applications requiring fine adjustment control.

Q: Are the TT Electronics 89PR100KLF and 90PR100KLF electrically identical?

A: Yes. Both maintain identical electrical specifications (100 kOhms, 0.75W, 20-turn, ±10% tolerance, ±100ppm/°C). Both are RoHS Compliant with MSL 1 rating. Inventory levels differ (1876 Pcs versus 979 Pcs).

Q: Will the larger face dimension of 89PR100KLF and 90PR100KLF (0.750" versus 0.250") affect circuit performance?

A: No. The larger face dimension affects only physical PCB layout and mounting footprint. Electrical performance is identical. Verify available PCB space before selection.

Q: Is the 18-turn M43P104KB40 acceptable for applications requiring precise adjustment?

A: The 18-turn specification provides approximately 10% faster adjustment speed than the 20-turn original. For applications with documented turn-count requirements, this deviation must be evaluated against specific tuning range and sensitivity specifications. The part is electrically equivalent in all other parameters.

Q: What is the difference between RoHS Compliant and RoHS3 Compliant status?

A: RoHS3 (RoHS Directive 2011/65/EU as amended) represents the current regulatory standard with expanded restricted substance coverage. RoHS Compliant indicates compliance with earlier RoHS Directive versions. Both designations indicate lead-free and restricted substance compliance; RoHS3 is preferred for current designs.

Q: Can I mix substitute parts from different manufacturers in the same circuit board?

A: Yes, provided all selected parts meet the mandatory matching parameters (resistance, power rating, tolerance, temperature coefficient, adjustment type, resistive material, mounting type, and termination style). Verify that turn-count variations do not create tuning conflicts in multi-stage adjustment circuits.

Q: What is the significance of MSL 1 (Unlimited) rating?

A: MSL 1 indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. This simplifies inventory management and reduces component degradation risk compared to higher MSL ratings.