TC73X-1-102E Equivalent & Substitute Parts

Part Overview

The TC73X-1-102E is a 1 kOhm surface mount trimmer potentiometer manufactured by Bourns Inc., part of the Trimpot® TC73 closed frame series. This component features a 0.05W power rating, carbon resistive material, J lead termination, and top adjustment capability with a single turn. The product is currently obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

TC73X-1-102E

Bourns Inc.In Stock: 914TC73X-1-102E Datasheet

Current PartRFQ

TC33X-2-102E

Bourns Inc.In Stock: 20788TC33X-2-102E Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The TC33X-2-102E qualifies as a direct substitute for the TC73X-1-102E based on the following alignment of critical electrical and mechanical parameters:

Matching Parameters:

• Resistance value: 1 kOhms (identical)
• Temperature coefficient: ±250ppm/°C (identical)
• Number of turns: 1 (identical)
• Adjustment type: Top adjustment (identical)
• Mounting type: Surface mount (identical)
• Termination style: J lead (identical)
• RoHS3 compliance (identical)
• MSL rating: 1 (identical)

Allowable Variations:

• Power rating: 0.1W (1/10W) versus 0.05W (1/20W) — the substitute provides higher power dissipation capability, which is acceptable for applications requiring the original specification
• Tolerance: ±25% versus ±30% — the substitute offers tighter tolerance, which is acceptable
• Resistive material: Cermet versus carbon — both materials support the specified resistance and temperature coefficient
• Physical dimensions: 0.150" x 0.142" (3.80mm x 3.60mm) versus 0.142" x 0.122" (3.60mm x 3.10mm) — minor dimensional increase remains compatible with standard surface mount footprints

Parameter Comparison

Engineering Selection Recommendations

The TC33X-2-102E is an active product with full ROHS3 compliance and unlimited moisture sensitivity rating, providing immediate availability and regulatory alignment for new designs and production support. The substitute maintains identical electrical performance in resistance, temperature coefficient, and adjustment characteristics while offering enhanced power dissipation capability and tighter tolerance specifications. The transition from carbon to cermet resistive material does not compromise functional equivalence for the specified application parameters. Physical dimensions increase marginally; PCB layout verification is required to confirm compatibility with existing footprints. The shift from closed frame to open frame construction represents a design evolution within the Trimpot® product family while preserving all critical functional parameters.

Frequently Asked Questions (FAQ)

Q: Can TC33X-2-102E directly replace TC73X-1-102E in existing designs?

A: Yes, provided PCB layout accommodates the slightly larger dimensions (0.150" x 0.142" versus 0.142" x 0.122"). All electrical parameters, termination style, and adjustment characteristics are compatible.

Q: What is the significance of the power rating difference (0.1W versus 0.05W)?

A: The TC33X-2-102E provides double the power dissipation capability. This represents a performance enhancement and does not create compatibility issues for applications designed for the lower rating.

Q: Does the change from carbon to cermet resistive material affect performance?

A: Both materials support the specified 1 kOhm resistance and ±250ppm/°C temperature coefficient. Cermet material in the TC33X-2-102E offers improved stability and is standard in the active TC33 series.

Q: Are there packaging differences between these parts?

A: TC73X-1-102E is obsolete with limited availability. TC33X-2-102E is active and available in Cut Tape (CT) and Digi-Reel® packaging formats, supporting standard production workflows.

Q: What compliance certifications apply to the substitute part?

A: TC33X-2-102E maintains ROHS3 compliance, REACH unaffected status, and MSL rating 1 (unlimited), matching the original part's regulatory profile.

Q: Is tolerance tighter on the substitute part significant?

A: TC33X-2-102E tolerance of ±25% is tighter than the original ±30%, providing improved precision. This is beneficial for applications requiring closer resistance control.