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ERJ-S1TF40R2U Equivalent & Substitute Parts
Part Overview
The ERJ-S1TF40R2U is a 40.2 Ohm ±1% 1W thick film chip resistor in 2512 (6432 Metric) package manufactured by Panasonic Electronic Components. This part features anti-sulfur coating and automotive AEC-Q200 qualification, designed for high-reliability applications in harsh environments. The product is currently active and available in high volume (1080 pcs in stock). Substitute parts are necessary when the primary part becomes unavailable, when design requirements shift to alternative manufacturers, or when supply chain optimization is needed while maintaining equivalent electrical and mechanical performance.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Resistance | 40.2 Ohms |
| Tolerance | ±1% |
| Power Rating | 1W |
| Package / Case | 2512 (6432 Metric) |
| Composition | Thick Film |
| Temperature Coefficient | ±100ppm/°C |
| Operating Temperature Range | -55°C ~ 155°C |
| Ratings | AEC-Q200 |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the ERJ-S1TF40R2U is determined by strict equivalence across the following parameters: resistance value (40.2 Ohms), tolerance (±1%), power rating (1W), package type (2512/6432 Metric), composition (thick film), temperature coefficient (±100ppm/°C), operating temperature range (-55°C ~ 155°C), and compliance certifications (AEC-Q200, ROHS3). All listed substitute parts meet these core electrical and mechanical requirements. Dimensional variations within the 2512 package specification are acceptable as they fall within standard manufacturing tolerances for this package class. Differences in specific features (such as anti-sulfur coating or moisture resistance enhancements) do not disqualify substitution when the core parameters remain equivalent.
Parameter Comparison
| Part Number | Manufacturer | Resistance | Tolerance | Power (W) | Package | Temp Coeff | Op Temp Range | AEC-Q200 | RoHS3 | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|
| ERJ-S1TF40R2U | Panasonic | 40.2 Ω | ±1% | 1 | 2512 | ±100ppm/°C | -55°C ~ 155°C | Yes | Yes | Active |
| ERJ-1TNF40R2U | Panasonic | 40.2 Ω | ±1% | 1 | 2512 | ±100ppm/°C | -55°C ~ 155°C | Yes | Yes | Not For New Designs |
| AC2512FK-0740R2L | YAGEO | 40.2 Ω | ±1% | 1 | 2512 | ±100ppm/°C | -55°C ~ 155°C | Yes | Yes | Active |
| CRCW251240R2FKEG | Vishay Dale | 40.2 Ω | ±1% | 1 | 2512 | ±100ppm/°C | -55°C ~ 155°C | Yes | Yes | Active |
| RC2512FK-0740R2L | YAGEO | 40.2 Ω | ±1% | 1 | 2512 | ±100ppm/°C | -55°C ~ 155°C | No | Yes | Active |
| RMCF2512FT40R2 | Stackpole Electronics Inc | 40.2 Ω | ±1% | 1 | 2512 | ±100ppm/°C | -55°C ~ 155°C | Yes | Yes | Active |
Engineering Selection Recommendations
For applications requiring AEC-Q200 automotive qualification, select from AC2512FK-0740R2L (YAGEO), CRCW251240R2FKEG (Vishay Dale), or RMCF2512FT40R2 (Stackpole Electronics Inc). All three are active products with full AEC-Q200 compliance and ROHS3 certification. The ERJ-1TNF40R2U (Panasonic) is electrically and mechanically equivalent but carries "Not For New Designs" status and should be used only for legacy system maintenance or repair applications. The RC2512FK-0740R2L (YAGEO) meets all core electrical parameters and ROHS3 compliance but lacks AEC-Q200 rating; this part is suitable for non-automotive applications where automotive qualification is not required.
Frequently Asked Questions (FAQ)
Q: Can ERJ-1TNF40R2U replace ERJ-S1TF40R2U in new designs? A: No. While ERJ-1TNF40R2U is electrically and mechanically equivalent, it carries "Not For New Designs" status. Use active-status alternatives for new product development.
Q: Are dimensional variations between substitute parts significant? A: No. All listed parts conform to the 2512 (6432 Metric) package specification. Dimensional variations (length 0.248" to 0.252", width 0.122" to 0.126", height 0.026" to 0.028") fall within standard manufacturing tolerances and do not affect PCB layout or assembly compatibility.
Q: Which substitute parts are suitable for automotive applications? A: AC2512FK-0740R2L, CRCW251240R2FKEG, and RMCF2512FT40R2 all carry AEC-Q200 automotive qualification. RC2512FK-0740R2L does not have AEC-Q200 rating and is not suitable for automotive use.
Q: Do all substitute parts have the same moisture sensitivity level? A: Yes. All listed parts have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.
Q: What is the difference between anti-sulfur and moisture-resistant features? A: Anti-sulfur coating (ERJ-S1TF40R2U) protects against sulfur-containing atmospheric corrosion. Moisture-resistant features (AC2512FK-0740R2L, RC2512FK-0740R2L) enhance performance in humid environments. Both are protective enhancements; their presence or absence does not affect core electrical equivalence for standard applications.
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