CT9W503 Equivalent & Substitute Parts Reference

Part Overview

The CT9W503 is a 50 kOhm, 0.5W through-hole trimmer potentiometer manufactured by Vishay Beyschlag/Draloric/BC Components. This cermet-based trimmer features 18 turns of adjustment with top-access control and PC pin termination, housed in a rectangular 9.60mm × 5.50mm package. The product is currently obsolete, making equivalent substitutes necessary for ongoing maintenance, repair, and legacy system support where original stock is depleted or unavailable.

Substiute Parts

CT9W503

Vishay Beyschlag/Draloric/BC ComponentsIn Stock: 1010CT9W503 Datasheet

Current PartRFQ

CT-9EW503

Nidec Components CorporationIn Stock: 1162CT-9EW503 Datasheet

DirectRFQ

3296W-1-503

Bourns Inc.In Stock: 18283296W-1-503 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CT9W503 is determined by strict equivalence across the following critical parameters:

• Resistance value: 50 kOhms (exact match required)
• Power rating: 0.5W minimum
• Tolerance: ±10% or better
• Temperature coefficient: ±100ppm/°C or better
• Adjustment type: Top adjustment (mechanical compatibility)
• Resistive material: Cermet (performance characteristics)
• Mounting type: Through hole (PCB integration)
• Termination style: PC pins (electrical connection)

Two substitute parts meet these criteria with noted variations in turn count and physical dimensions that remain within acceptable mechanical tolerances for standard PCB layouts.

Parameter Comparison

Engineering Selection Recommendations

CT-9EW503 (Nidec Components Corporation): This substitute provides direct functional equivalence with identical turn count (18), matching face dimensions (9.60mm × 5.50mm), and all critical electrical parameters. The part is currently in active production status with ROHS3 compliance, making it suitable for new designs and legacy system replacements where regulatory compliance is required. Inventory availability is confirmed at 1129 pieces.

3296W-1-503 (Bourns Inc.): This substitute meets all core electrical specifications and maintains mechanical compatibility through standard through-hole PC pin termination. The primary distinction is the increased turn count (25 turns versus 18), which provides finer adjustment resolution. Physical dimensions are slightly reduced (9.53mm × 4.83mm), remaining compatible with standard PCB layouts. The part is in active production. Note that RoHS compliance status differs from the original specification.

Frequently Asked Questions (FAQ)

Q: Can CT-9EW503 be used as a direct replacement for CT9W503?

A: Yes. The CT-9EW503 maintains identical electrical specifications (50 kOhms, 0.5W, ±10% tolerance, ±100ppm/°C), identical turn count (18), and matching physical dimensions (9.60mm × 5.50mm). No circuit modifications are required.

Q: What is the impact of the 25-turn design in the 3296W-1-503?

A: The increased turn count provides finer adjustment granularity. For applications requiring precise calibration, this may offer improved tuning capability. The electrical performance remains equivalent across the specified tolerance and temperature coefficient ranges.

Q: Are there physical space constraints with the 3296W-1-503?

A: The 3296W-1-503 has slightly reduced dimensions (9.53mm × 4.83mm versus 9.60mm × 5.50mm). This difference is typically accommodated in standard PCB layouts. Verify mounting hole spacing and clearance in your specific application before implementation.

Q: What is the significance of RoHS compliance differences?

A: The CT-9EW503 carries ROHS3 compliance, while the original CT9W503 and 3296W-1-503 are non-compliant. For applications subject to RoHS regulations or customer requirements, the CT-9EW503 is the appropriate selection.

Q: How do packaging formats affect component handling?

A: CT-9EW503 is supplied in bulk packaging, while 3296W-1-503 is supplied in tube packaging. Bulk packaging is suitable for high-volume assembly operations, while tube packaging provides organized component management for lower-volume applications. Both formats are compatible with standard pick-and-place and manual assembly processes.