ERJ-S1TF1241U Equivalent & Substitute Parts

Part Overview

The ERJ-S1TF1241U is a 1.24 kOhms ±1% 1W chip resistor in 2512 (6432 Metric) package manufactured by Panasonic Electronic Components. This thick film resistor features anti-sulfur coating and automotive AEC-Q200 qualification, designed for high-reliability applications in automotive and industrial environments. The part is currently in active production status with 1032 units in stock.

Substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility permits selection from qualified alternatives that meet identical electrical and mechanical specifications.

Substiute Parts

ERJ-S1TF1241U

Panasonic Electronic ComponentsIn Stock: 1097ERJ-S1TF1241U Datasheet

Current PartRFQ

ERJ-1TNF1241U

Panasonic Electronic ComponentsIn Stock: 10841ERJ-1TNF1241U Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ERJ-S1TF1241U is determined by strict equivalence across the following parameters:

• Resistance value: 1.24 kOhms
• Tolerance: ±1%
• Power rating: 1W
• Package: 2512 (6432 Metric)
• Composition: Thick Film
• Temperature coefficient: ±100ppm/°C
• Operating temperature range: -55°C ~ 155°C
• Automotive qualification: AEC-Q200
• RoHS compliance: ROHS3 Compliant
• Moisture sensitivity: MSL 1

The ERJ-1TNF1241U qualifies as a direct substitute based on complete alignment with all electrical and mechanical parameters. The primary distinction is product status: ERJ-S1TF1241U is active production, while ERJ-1TNF1241U is designated "Not For New Designs," indicating it remains available but is not recommended for new circuit designs.

Parameter Comparison

Engineering Selection Recommendations

For new circuit designs, the ERJ-S1TF1241U is the preferred selection due to its active production status and manufacturer commitment to continued supply. Both parts carry identical AEC-Q200 automotive qualification and ROHS3 compliance, ensuring equivalent reliability and regulatory acceptance.

The ERJ-1TNF1241U remains electrically and mechanically interchangeable and may be selected for legacy design support, field repairs, or applications where higher inventory availability (10800 units) justifies use of a "Not For New Designs" part. The designation reflects manufacturing lifecycle management rather than performance degradation.

Both parts are suitable for automotive and industrial applications requiring 1W dissipation at 1.24 kOhms with ±1% tolerance across the -55°C to 155°C operating range.

Frequently Asked Questions (FAQ)

Q: Can ERJ-1TNF1241U be used as a direct replacement for ERJ-S1TF1241U in new designs?

A: Electrically and mechanically, yes. However, ERJ-1TNF1241U carries "Not For New Designs" status. For new circuit development, ERJ-S1TF1241U is the specified choice. ERJ-1TNF1241U is appropriate for legacy system support or field service applications.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both parts use the 2512 (6432 Metric) package with identical dimensions: 0.252" L x 0.126" W (6.40mm x 3.20mm) and maximum seated height of 0.028" (0.70mm).

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both ERJ-S1TF1241U and ERJ-1TNF1241U carry AEC-Q200 qualification and are suitable for automotive applications.

Q: What is the significance of the product status difference?

A: "Active" status indicates the manufacturer continues production and recommends the part for new designs. "Not For New Designs" indicates the part remains available but the manufacturer is not actively promoting it for new applications. Both parts are functionally equivalent.

Q: Are there differences in RoHS or REACH compliance?

A: No. Both parts are ROHS3 Compliant and REACH Unaffected, meeting identical environmental and regulatory requirements.