SMUB504PET Equivalent & Substitute Parts

Part Overview

The SMUB504PET is a 500 kOhms, 0.25W surface mount trimmer potentiometer manufactured by Ohmite in the SMU series. This component features a Cermet resistive element with gull wing termination and top adjustment capability, designed for precision tuning applications in compact form factors. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing production support and design continuity.

Substiute Parts

SMUB504PET

OhmiteIn Stock: 1404SMUB504PET Datasheet

Current PartRFQ

ST-4ETB504

Nidec Components CorporationIn Stock: 844ST-4ETB504 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMUB504PET is determined by strict equivalence across the following critical parameters:

• Resistance value: 500 kOhms (exact match required)
• Power rating: 0.25W, 1/4W (exact match required)
• Tolerance: ±20% (exact match required)
• Temperature coefficient: ±100ppm/°C (exact match required)
• Number of turns: 1 (exact match required)
• Adjustment type: Top Adjustment (exact match required)
• Resistive material: Cermet (exact match required)
• Mounting type: Surface Mount (exact match required)
• Termination style: Gull Wing (exact match required)
• Physical dimensions: 0.197" x 0.177" Face (5.00mm x 4.50mm) (exact match required)
• RoHS compliance: ROHS3 Compliant (minimum requirement)

The ST-4ETB504 manufactured by Nidec Components Corporation meets all specified electrical and mechanical parameters and qualifies as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

The ST-4ETB504 is the qualified substitute for the obsolete SMUB504PET. Both components demonstrate identical electrical specifications and mechanical compatibility. The ST-4ETB504 carries active product status with current manufacturing support, ensuring long-term availability and supply chain continuity. Both parts maintain ROHS3 compliance and unlimited moisture sensitivity classification, satisfying regulatory and environmental requirements. The primary distinction is packaging format: the original SMUB504PET is supplied in Cut Tape (CT) configuration, while the ST-4ETB504 is available in Tape & Reel (TR) format, which is standard for high-volume production environments.

Frequently Asked Questions (FAQ)

Q: Can the ST-4ETB504 be used as a direct replacement for the SMUB504PET in existing designs?

A: Yes. The ST-4ETB504 matches all critical electrical and mechanical parameters of the SMUB504PET, including resistance value, power rating, tolerance, temperature coefficient, adjustment type, resistive material, termination style, and physical dimensions. No circuit redesign is required.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) packaging supplies individual components on tape segments, suitable for small-quantity orders and manual assembly. Tape & Reel (TR) packaging provides components on continuous reels, optimized for automated pick-and-place assembly in production environments. Both formats contain identical components.

Q: Are there any compliance differences between the two parts?

A: No. Both the SMUB504PET and ST-4ETB504 are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity classification. The ST-4ETB504 additionally carries REACH Unaffected status.

Q: Why is the SMUB504PET classified as obsolete?

A: Obsolete status indicates the part is no longer in active production by the original manufacturer. The ST-4ETB504 provides functional continuity for applications requiring 500 kOhms, 0.25W surface mount trimmer potentiometers with identical specifications.

Q: Are the physical dimensions identical between both parts?

A: Yes. Both components feature a rectangular form factor of 0.197" x 0.177" face dimension (5.00mm x 4.50mm), ensuring mechanical compatibility in existing PCB layouts and assembly fixtures.