TC86K-1-503 Equivalent & Substitute Parts

Part Overview

The TC86K-1-503 is a 50 kOhm trimmer potentiometer manufactured by Bourns Inc., part of the Trimpot® TC86 series. This through-hole component features PC pin termination, side adjustment, and a 0.3W power rating with cermet resistive material. The product is currently obsolete, making identification of suitable substitute components essential for ongoing maintenance, repair, and legacy system support.

Substiute Parts

TC86K-1-503

Bourns Inc.In Stock: 825TC86K-1-503 Datasheet

Current PartRFQ

3306K-1-503

Bourns Inc.In Stock: 11733306K-1-503 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TC86K-1-503 is determined by the following critical parameters:

• Resistance value: 50 kOhms (exact match required)
• Adjustment type: Side Adjustment (functional requirement)
• Termination style: PC Pins (mechanical compatibility)
• Mounting type: Through Hole (PCB integration requirement)
• Resistive material: Cermet (performance characteristic)
• Temperature coefficient: ±250ppm/°C (thermal stability)
• Number of turns: 1 (operational specification)

The 3306K-1-503 meets all primary substitution criteria. Variations in power rating (0.3W vs. 0.2W), tolerance (±20% vs. ±25%), and physical dimensions represent acceptable trade-offs within the allowed parameter range for this component category, provided circuit design accommodates these differences.

Parameter Comparison

Engineering Selection Recommendations

The 3306K-1-503 is the designated substitute for the obsolete TC86K-1-503. Both components are manufactured by Bourns Inc. and maintain identical core electrical specifications: 50 kOhm resistance, ±250ppm/°C temperature coefficient, 1-turn side adjustment, cermet construction, and PC pin termination for through-hole mounting.

The 3306K-1-503 carries Active product status, ensuring continued availability and supply chain reliability. Both parts maintain ROHS3 compliance and REACH Unaffected status, satisfying regulatory requirements for new designs and legacy system support.

The power rating reduction from 0.3W to 0.2W and tolerance widening from ±20% to ±25% are acceptable within standard engineering practice for trimmer potentiometer substitution, contingent upon circuit design verification that power dissipation remains within the 0.2W limit and tolerance stack-up does not exceed system requirements.

Physical dimensions differ slightly; verify PCB layout accommodates the 3306K-1-503 footprint (0.268" x 0.319" vs. 0.303" x 0.268") before implementation.

Frequently Asked Questions (FAQ)

Q: Can the 3306K-1-503 directly replace the TC86K-1-503 in existing designs?

A: Yes, provided circuit design accommodates the reduced power rating (0.2W vs. 0.3W) and wider tolerance (±25% vs. ±20%). Verify PCB layout compatibility with the slightly different physical dimensions.

Q: What is the primary reason for substitution?

A: The TC86K-1-503 is obsolete. The 3306K-1-503 is an active product from the same manufacturer with equivalent electrical performance and maintained regulatory compliance.

Q: Are there compliance differences between these parts?

A: No. Both components are ROHS3 compliant, REACH Unaffected, and carry MSL Rating 1 (Unlimited), meeting identical regulatory standards.

Q: How do tolerance differences affect circuit performance?

A: The TC86K-1-503 specifies ±20% tolerance; the 3306K-1-503 specifies ±25%. System designs must accommodate the wider tolerance band of the substitute. Verify that tolerance stack-up analysis remains within acceptable limits for your application.

Q: What are the physical dimension differences?

A: TC86K-1-503: 0.303" x 0.268" (7.70mm x 6.80mm). 3306K-1-503: 0.268" x 0.319" (6.81mm x 8.10mm). Confirm PCB layout and mounting clearances support the substitute component dimensions.

Q: Is the reduced power rating a concern?

A: The power rating reduction from 0.3W to 0.2W requires circuit analysis to confirm that actual power dissipation in your application remains below 0.2W. If circuit design requires the full 0.3W capability, this substitute may not be suitable.

Q: Do both parts use the same resistive material?

A: Yes. Both the TC86K-1-503 and 3306K-1-503 use cermet resistive material, ensuring consistent performance characteristics and temperature stability (±250ppm/°C).