ERJ-S14F3921U Equivalent & Substitute Parts

Part Overview

The ERJ-S14F3921U is a 3.92 kOhms ±1% thick film chip resistor manufactured by Panasonic Electronic Components in the 1210 (3225 Metric) package format. This component is rated for 0.5W power dissipation and meets AEC-Q200 automotive qualification standards with anti-sulfur protection. The part is currently in active production status with 755 units available in stock.

Substitute parts are necessary when the primary part becomes unavailable, when design revisions require alternative qualified sources, or when inventory constraints require sourcing from alternative manufacturers while maintaining equivalent electrical and mechanical performance.

Substiute Parts

ERJ-S14F3921U

Panasonic Electronic ComponentsIn Stock: 773ERJ-S14F3921U Datasheet

Current PartRFQ

ERJ-14NF3921U

Panasonic Electronic ComponentsIn Stock: 15184ERJ-14NF3921U Datasheet

SimilarRFQ

CRCW12103K92FKEA

Vishay DaleIn Stock: 13535CRCW12103K92FKEA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ERJ-S14F3921U is determined by strict equivalence across the following critical parameters:

• Resistance value: 3.92 kOhms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 0.5W minimum
• Package format: 1210 (3225 Metric) with 2 terminations
• Composition: Thick film construction
• Temperature coefficient: ±100ppm/°C
• Operating temperature range: -55°C ~ 155°C minimum
• Automotive qualification: AEC-Q200 certification
• RoHS compliance: ROHS3 Compliant
• Moisture sensitivity: MSL 1 or better

All identified substitute parts meet these criteria and are therefore electrically and mechanically interchangeable with the primary part number.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (ERJ-S14F3921U): This part maintains active production status and is recommended for new designs. Current inventory of 755 units supports immediate procurement requirements.

Secondary Selection (CRCW12103K92FKEA): This Vishay Dale equivalent is suitable for applications requiring multi-source qualification or when Panasonic supply becomes constrained. The part is in active production with 13,507 units in stock and meets all electrical and mechanical requirements. The seated height is 0.024" (0.60mm) compared to 0.028" (0.70mm) for the primary part, which may be advantageous in space-constrained PCB layouts.

Tertiary Selection (ERJ-14NF3921U): This Panasonic part is electrically and mechanically equivalent but carries a "Not For New Designs" status. Use is limited to legacy system maintenance, repair, or applications where design freeze conditions apply. Inventory availability is high at 15,118 units.

Frequently Asked Questions (FAQ)

Q: Can ERJ-14NF3921U be used in new designs? A: No. The ERJ-14NF3921U carries a "Not For New Designs" product status designation. This part is suitable only for legacy system support, field repairs, or applications with design freeze requirements. New designs should use ERJ-S14F3921U or CRCW12103K92FKEA.

Q: Are there physical differences between the substitute parts? A: All three parts use the 1210 (3225 Metric) package with identical length (0.126") and width (0.098") dimensions. The seated height differs slightly: ERJ-S14F3921U and ERJ-14NF3921U are 0.028" (0.70mm) maximum, while CRCW12103K92FKEA is 0.024" (0.60mm) maximum. This 0.004" difference may be relevant for applications with tight vertical clearance constraints.

Q: Do all substitute parts meet automotive qualification requirements? A: Yes. All three parts carry AEC-Q200 automotive qualification certification and are suitable for automotive applications requiring this standard.

Q: What is the difference between ERJ-S14F3921U and ERJ-14NF3921U? A: Both parts are manufactured by Panasonic with identical electrical specifications (3.92 kOhms ±1%, 0.5W, ±100ppm/°C). The primary difference is product status: ERJ-S14F3921U is active for new designs, while ERJ-14NF3921U is designated "Not For New Designs." The ERJ-S14F3921U also includes anti-sulfur protection in its feature set.

Q: Can CRCW12103K92FKEA be used as a drop-in replacement? A: Yes. CRCW12103K92FKEA meets all electrical and mechanical requirements for direct substitution. The 0.004" reduction in seated height may require PCB layout verification in space-constrained applications, but electrical performance and package footprint are fully compatible.

Q: Are all parts RoHS and REACH compliant? A: Yes. All three parts are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements.