CT9X203 Trimmer Potentiometer - Equivalent & Substitute Parts

Part Overview

The CT9X203 is a 20 kOhm, 0.5W through-hole trimmer potentiometer manufactured by Vishay Beyschlag/Draloric/BC Components. This cermet-based side-adjustment trimmer features an 18-turn design with PC pin termination and rectangular form factor (9.60mm x 5.50mm). The part is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Direct functional replacements are available from active manufacturers with identical or compatible electrical and mechanical specifications.

Substiute Parts

CT9X203

Vishay Beyschlag/Draloric/BC ComponentsIn Stock: 862CT9X203 Datasheet

Current PartRFQ

CT-9EX203

Nidec Components CorporationIn Stock: 839CT-9EX203 Datasheet

DirectRFQ

3296X-1-203

Bourns Inc.In Stock: 19463296X-1-203 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CT9X203 is determined by strict equivalence across the following critical parameters:

• Resistance value: 20 kOhms (exact match required)
• Power rating: 0.5W / 1/2W (exact match required)
• Tolerance: ±10% (exact match required)
• Temperature coefficient: ±100ppm/°C (exact match required)
• Adjustment type: Side Adjustment (exact match required)
• Resistive material: Cermet (exact match required)
• Mounting type: Through Hole (exact match required)
• Termination style: PC Pins (exact match required)

Variations in the following parameters are permitted within the substitute category:

• Number of turns: 18 or 25 turns (functional equivalence maintained)
• Face dimensions: Minor variations acceptable if mounting footprint compatibility is verified
• Manufacturer and product status: Active alternatives preferred for obsolete parts
• RoHS and REACH compliance: May differ from original part

Parameter Comparison

Engineering Selection Recommendations

CT-9EX203 (Nidec Components Corporation) is the primary direct substitute. This part maintains identical electrical specifications and physical dimensions to the CT9X203. The CT-9EX203 carries Active product status and RoHS3 compliance, making it suitable for new designs and applications requiring regulatory compliance. Inventory availability is confirmed at 820 pieces.

3296X-1-203 (Bourns Inc.) is a functional equivalent with the following considerations: The part maintains all critical electrical parameters but features 25 turns instead of 18, providing finer adjustment resolution. Face dimensions differ slightly (10.03mm x 4.83mm versus 9.60mm x 5.50mm), requiring verification of PCB layout compatibility. This part is Active and available in tube packaging (1900 pieces in stock). RoHS non-compliance status matches the original CT9X203.

Selection between CT-9EX203 and 3296X-1-203 depends on application requirements: choose CT-9EX203 for direct form-fit-function replacement; choose 3296X-1-203 when finer adjustment capability and higher inventory levels justify dimensional verification.

Frequently Asked Questions (FAQ)

Q: Can CT-9EX203 be used as a direct replacement for CT9X203?

A: Yes. The CT-9EX203 maintains identical electrical specifications (20 kOhms, 0.5W, ±10% tolerance, ±100ppm/°C), identical number of turns (18), and identical physical dimensions (9.60mm x 5.50mm). No circuit modifications are required.

Q: What is the difference between 18-turn and 25-turn versions?

A: The number of turns affects adjustment resolution. An 18-turn trimmer completes full resistance range in 18 rotations; a 25-turn trimmer requires 25 rotations for the same range. The 25-turn design (3296X-1-203) provides finer adjustment capability but requires more rotation time for full-range tuning.

Q: Are there packaging differences between substitutes?

A: Yes. CT-9EX203 is supplied in Bulk packaging; 3296X-1-203 is supplied in Tube packaging. Packaging affects handling, storage, and integration into assembly processes but does not affect electrical or mechanical function.

Q: Does RoHS compliance affect substitution eligibility?

A: RoHS compliance is not a substitution criterion for this product category. Both RoHS-compliant (CT-9EX203) and non-compliant (3296X-1-203) alternatives are electrically and mechanically equivalent. Compliance selection depends on end-application regulatory requirements, not component interchangeability.

Q: Can 3296X-1-203 be used in applications designed for CT9X203?

A: Electrical substitution is valid. Mechanical substitution requires PCB layout verification due to dimensional differences: 3296X-1-203 face is 10.03mm x 4.83mm versus CT9X203 at 9.60mm x 5.50mm. Confirm mounting hole spacing and clearance before implementation.

Q: Why is CT9X203 listed as obsolete?

A: Obsolete status indicates the part is no longer manufactured by the original supplier. Active alternatives from Nidec and Bourns provide equivalent functionality and ensure supply chain continuity.