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RN732ATTD40R2B50 Equivalent & Substitute Parts
Part Overview
The RN732ATTD40R2B50 is a 40.2 Ohm ±0.1% thin film chip resistor manufactured by KOA Speer Electronics, Inc., rated at 0.1W (1/10W) in 0805 (2012 Metric) package format. This component features moisture-resistant construction with a temperature coefficient of ±50ppm/°C and operates across -55°C to 155°C. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for ongoing production and repair applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Resistance | 40.2 Ohms |
| Tolerance | ±0.1% |
| Power Rating | 0.1W (1/10W) |
| Package / Case | 0805 (2012 Metric) |
| Composition | Thin Film |
| Temperature Coefficient | ±50ppm/°C |
| Operating Temperature Range | -55°C ~ 155°C |
| Moisture Sensitivity Level | 1 (Unlimited) |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the RN732ATTD40R2B50 is determined by strict adherence to the following electrical and mechanical parameters:
Primary Substitution Criteria:
- Resistance value: 40.2 Ohms (exact match required)
- Tolerance: ±0.1% (exact match required)
- Package / Case: 0805 (2012 Metric) (exact match required)
- Composition: Thin Film (exact match required)
- Operating Temperature Range: -55°C ~ 155°C (minimum requirement)
- Moisture Sensitivity Level: 1 (Unlimited) (minimum requirement)
- RoHS Status: ROHS3 Compliant (minimum requirement)
Secondary Consideration:
- Power Rating: Substitute parts rated at 0.1W or higher are acceptable. Higher power ratings provide thermal margin without affecting electrical performance in circuits designed for 0.1W operation.
- Temperature Coefficient: Values of ±50ppm/°C or lower are acceptable. Lower temperature coefficients provide improved stability.
All substitute parts listed maintain identical resistance, tolerance, package, and composition specifications. Variations in power rating and temperature coefficient represent functional improvements or alternative feature sets suitable for the same circuit applications.
Parameter Comparison
| Part Number | Manufacturer | Resistance | Tolerance | Power (W) | Temp Coeff (ppm/°C) | Operating Temp (°C) | Status | Features |
|---|---|---|---|---|---|---|---|---|
| RN732ATTD40R2B50 | KOA Speer | 40.2 Ω | ±0.1% | 0.1 | ±50 | -55 ~ 155 | Obsolete | Moisture Resistant |
| RN73R2ATTD40R2B50 | KOA Speer | 40.2 Ω | ±0.1% | 0.125 | ±50 | -55 ~ 155 | Active | Automotive AEC-Q200, Moisture Resistant |
| AT0805BRD0740R2L | YAGEO | 40.2 Ω | ±0.1% | 0.125 | ±25 | -55 ~ 155 | Active | Anti-Sulfur, Automotive AEC-Q200, Moisture Resistant |
| CPF0805B40R2E1 | TE Connectivity | 40.2 Ω | ±0.1% | 0.1 | ±25 | -55 ~ 155 | Active | None specified |
| CRT0805-BY-40R2ELF | Bourns Inc. | 40.2 Ω | ±0.1% | 0.125 | ±25 | -55 ~ 155 | Active | Current Sense |
| PHP00805E40R2BST1 | Vishay Dale | 40.2 Ω | ±0.1% | 0.63 | ±25 | -55 ~ 155 | Active | Flame Proof, Moisture Resistant, Safety |
| RN73C2A40R2BTDF | TE Connectivity | 40.2 Ω | ±0.1% | 0.1 | ±10 | -55 ~ 155 | Active | None specified |
| RN73C2A40R2BTG | TE Connectivity | 40.2 Ω | ±0.1% | 0.1 | ±10 | -55 ~ 155 | Active | None specified |
| RNCF0805BKE40R2 | Stackpole Electronics | 40.2 Ω | ±0.1% | 0.25 | ±25 | -55 ~ 155 | Active | Automotive AEC-Q200 |
| RNCF0805BKT40R2 | Stackpole Electronics | 40.2 Ω | ±0.1% | 0.125 | ±10 | -55 ~ 155 | Active | Automotive AEC-Q200 |
| RNCF0805BTC40R2 | Stackpole Electronics | 40.2 Ω | ±0.1% | 0.25 | ±50 | -55 ~ 155 | Active | Automotive AEC-Q200 |
Engineering Selection Recommendations
Direct Replacement (Identical Electrical Performance):
CPF0805B40R2E1 and RN73C2A40R2BTDF/RN73C2A40R2BTG provide direct electrical equivalence to the RN732ATTD40R2B50, maintaining 0.1W power rating and 40.2 Ohm ±0.1% specifications. Both are active products with ROHS3 compliance. CPF0805B40R2E1 offers improved temperature coefficient (±25ppm/°C) while maintaining identical power rating. RN73C2A variants provide superior temperature coefficient (±10ppm/°C) and are available in both Tape & Reel and Strip packaging formats.
Enhanced Performance Substitutes (Higher Power Rating):
RN73R2ATTD40R2B50, AT0805BRD0740R2L, CRT0805-BY-40R2ELF, RNCF0805BKT40R2, and RNCF0805BKE40R2 provide increased power ratings (0.125W to 0.25W) while maintaining 40.2 Ohm ±0.1% specifications. These components are suitable for applications requiring thermal margin. RN73R2ATTD40R2B50 maintains KOA Speer manufacturing continuity with automotive AEC-Q200 qualification. AT0805BRD0740R2L adds anti-sulfur protection. RNCF variants provide automotive AEC-Q200 qualification from Stackpole Electronics.
Maximum Thermal Capability:
PHP00805E40R2BST1 delivers 0.63W power rating with flame-proof and safety certifications, suitable for high-dissipation applications requiring the 40.2 Ohm ±0.1% specification.
Packaging Considerations:
All substitute parts maintain 0805 (2012 Metric) package compatibility. Packaging format variations (Tape & Reel, Strip, Cut Tape & Digi-Reel) do not affect electrical performance and are selected based on procurement and assembly requirements.
Frequently Asked Questions (FAQ)
Q: Can I substitute RN732ATTD40R2B50 with a higher power-rated resistor?
A: Yes. Resistors rated at 0.125W, 0.25W, or 0.63W are electrically compatible substitutes. Higher power ratings provide thermal margin without affecting circuit operation. The 40.2 Ohm resistance and ±0.1% tolerance remain identical.
Q: What is the difference between ±50ppm/°C and ±25ppm/°C temperature coefficient?
A: Temperature coefficient defines resistance change per degree Celsius. ±25ppm/°C represents tighter stability across temperature extremes. For applications operating across the full -55°C to 155°C range, lower temperature coefficients reduce resistance drift. Both values meet the operating temperature specification.
Q: Are automotive AEC-Q200 qualified parts suitable for non-automotive applications?
A: Yes. Automotive AEC-Q200 qualification indicates enhanced reliability testing and quality standards. These parts are suitable for any application requiring 40.2 Ohm ±0.1% thin film resistors in 0805 package.
Q: What is the significance of anti-sulfur coating?
A: Anti-sulfur coating protects against corrosion in high-sulfur environments. AT0805BRD0740R2L includes this feature. For standard industrial and commercial applications without sulfur exposure, this feature is not required.
Q: Can I use RN73C2A40R2BTDF (Tape & Reel) and RN73C2A40R2BTG (Strip) interchangeably?
A: Electrically, yes. Both parts are identical in resistance, tolerance, power rating, and temperature coefficient. The difference is packaging format: Tape & Reel for automated assembly lines, Strip for manual or alternative assembly processes. Select based on assembly equipment compatibility.
Q: Is moisture sensitivity level 1 (Unlimited) maintained across all substitutes?
A: Yes. All listed substitute parts maintain MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.
Q: What does "current sense" designation on CRT0805-BY-40R2ELF indicate?
A: Current sense resistors are optimized for precision current measurement applications. CRT0805-BY-40R2ELF maintains the 40.2 Ohm ±0.1% specification and is suitable for both general-purpose and current-sensing circuit applications.
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