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RN732ATTD40R2D25 Equivalent & Substitute Parts
Part Overview
The RN732ATTD40R2D25 is a 40.2 Ohm ±0.5% 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 ±25ppm/°C and operates across the -55°C to 155°C temperature range. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design requirements and procurement continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Resistance | 40.2 Ohms |
| Tolerance | ±0.5% |
| Power Rating | 0.1W (1/10W) |
| Package | 0805 (2012 Metric) |
| Composition | Thin Film |
| Temperature Coefficient | ±25ppm/°C |
| Operating Temperature Range | -55°C to 155°C |
| Moisture Sensitivity Level | 1 (Unlimited) |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the RN732ATTD40R2D25 is determined by strict adherence to the following electrical and mechanical parameters:
Primary Substitution Criteria:
- Resistance value: 40.2 Ohms (exact match required)
- Tolerance: ±0.5% or tighter (±0.1%, ±0.25% acceptable as upgrades)
- Package: 0805 (2012 Metric) form factor (mandatory)
- Composition: Thin film construction
- Temperature coefficient: ±25ppm/°C
- Operating temperature range: -55°C to 155°C minimum
- Moisture Sensitivity Level: 1 (Unlimited)
- RoHS3 compliance
Power Rating Considerations: Substitute parts with equal or higher power ratings (0.1W, 0.125W, 0.25W, 0.63W) are functionally compatible. Higher power ratings provide thermal margin without affecting electrical performance in the circuit.
Tolerance Upgrades: Parts with tighter tolerances (±0.1%, ±0.25%) than the original ±0.5% specification are classified as upgrades and provide enhanced precision for applications requiring improved accuracy.
Active Status Requirement: All listed substitutes maintain active product status with current manufacturer support and availability, ensuring long-term procurement viability.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Resistance | Tolerance | Power (W) | Package | Temp Coeff | Op Temp Range | Status | Key Features |
|---|---|---|---|---|---|---|---|---|---|
| RN732ATTD40R2D25 | KOA Speer | 40.2Ω | ±0.5% | 0.1 | 0805 | ±25ppm/°C | -55 to 155°C | Obsolete | Moisture Resistant |
| RN73R2ATTD40R2D25 | KOA Speer | 40.2Ω | ±0.5% | 0.125 | 0805 | ±25ppm/°C | -55 to 155°C | Active | Automotive AEC-Q200, Moisture Resistant |
| RT0805DRD0740R2L | YAGEO | 40.2Ω | ±0.5% | 0.125 | 0805 | ±25ppm/°C | -55 to 155°C | Active | Thin Film |
| AT0805BRD0740R2L | YAGEO | 40.2Ω | ±0.1% | 0.125 | 0805 | ±25ppm/°C | -55 to 155°C | Active | Anti-Sulfur, Automotive AEC-Q200, Moisture Resistant |
| AT0805CRD0740R2L | YAGEO | 40.2Ω | ±0.25% | 0.125 | 0805 | ±25ppm/°C | -55 to 155°C | Active | Anti-Sulfur, Automotive AEC-Q200, Moisture Resistant |
| AT0805DRD0740R2L | YAGEO | 40.2Ω | ±0.5% | 0.125 | 0805 | ±25ppm/°C | -55 to 155°C | Active | Anti-Sulfur, Automotive AEC-Q200, Moisture Resistant |
| CPF0805B40R2E1 | TE Connectivity | 40.2Ω | ±0.1% | 0.1 | 0805 | ±25ppm/°C | -55 to 155°C | Active | Thin Film (Neohm Series) |
| CRT0805-BY-40R2ELF | Bourns Inc. | 40.2Ω | ±0.1% | 0.125 | 0805 | ±25ppm/°C | -55 to 155°C | Active | Current Sense Thin Film |
| PHP00805E40R2BST1 | Vishay Dale | 40.2Ω | ±0.1% | 0.63 | 0805 | ±25ppm/°C | -55 to 155°C | Active | Flame Proof, Moisture Resistant, Safety Thin Film |
| RNCF0805BKE40R2 | Stackpole Electronics | 40.2Ω | ±0.1% | 0.25 | 0805 | ±25ppm/°C | -55 to 155°C | Active | Automotive AEC-Q200 Thin Film |
| RNCF0805BTE40R2 | Stackpole Electronics | 40.2Ω | ±0.1% | 0.25 | 0805 | ±25ppm/°C | -55 to 155°C | Active | Automotive AEC-Q200 Thin Film |
Engineering Selection Recommendations
Direct Equivalent (Same Power Rating): CPF0805B40R2E1 from TE Connectivity provides a direct electrical equivalent with identical 0.1W power rating and matching 0805 package. This part maintains ±0.1% tolerance (tighter than original), ROHS3 compliance, and active product status. Selection is appropriate for applications requiring minimal design modification.
Standard Substitutes (Higher Power Rating, Same Tolerance): RN73R2ATTD40R2D25 (KOA Speer, 0.125W) and RT0805DRD0740R2L (YAGEO, 0.125W) both maintain the ±0.5% tolerance specification with increased thermal capacity. Both components are ROHS3 compliant and active. The KOA Speer variant includes automotive AEC-Q200 qualification, suitable for automotive applications.
Precision Upgrades (Tighter Tolerance): AT0805BRD0740R2L, AT0805CRD0740R2L, and AT0805DRD0740R2L (YAGEO AT series) offer tolerance improvements (±0.1% and ±0.25%) with automotive AEC-Q200 certification and anti-sulfur features. These are appropriate for precision measurement circuits or applications requiring enhanced accuracy.
High-Power Alternative: PHP00805E40R2BST1 (Vishay Dale, 0.63W) provides significant thermal margin with ±0.1% tolerance, flame-proof construction, and safety certification. Selection is appropriate for high-dissipation applications or environments requiring enhanced reliability margins.
Automotive-Qualified Options: RNCF0805BKE40R2 and RNCF0805BTE40R2 (Stackpole Electronics) deliver automotive AEC-Q200 qualification with ±0.1% tolerance and 0.25W power rating. These are suitable for automotive circuit applications requiring qualified component status.
Current Sense Application: CRT0805-BY-40R2ELF (Bourns Inc.) is specifically designed for current sensing applications with ±0.1% tolerance and 0.125W rating, appropriate for precision current measurement circuits.
All listed substitutes maintain ROHS3 compliance, MSL Level 1 (Unlimited), and the required -55°C to 155°C operating temperature range.
Frequently Asked Questions (FAQ)
Q: Can I use a substitute part with higher power rating than the original RN732ATTD40R2D25?
A: Yes. Higher power ratings (0.125W, 0.25W, 0.63W) are functionally compatible. The resistor will operate within its thermal limits with additional margin. Electrical performance remains unchanged. Physical dimensions remain within 0805 package specifications.
Q: What is the difference between ±0.5%, ±0.25%, and ±0.1% tolerance parts?
A: Tolerance specifies the maximum deviation from the nominal 40.2 Ohm value. ±0.5% allows ±0.201 Ohm variation; ±0.25% allows ±0.1005 Ohm variation; ±0.1% allows ±0.0402 Ohm variation. Tighter tolerances (±0.1%, ±0.25%) are suitable for precision applications. The original ±0.5% specification is adequate for general-purpose circuits.
Q: Are automotive AEC-Q200 qualified parts compatible with non-automotive applications?
A: Yes. AEC-Q200 qualification indicates enhanced reliability testing and qualification for automotive environments. These parts are fully compatible with non-automotive applications and provide additional reliability assurance.
Q: What does MSL Level 1 (Unlimited) mean?
A: Moisture Sensitivity Level 1 indicates the component requires no special moisture control during storage, handling, or assembly. No baking or dry-pack storage is required. This simplifies procurement and assembly processes.
Q: Can I substitute the KOA Speer RN732ATTD40R2D25 with a YAGEO part?
A: Yes. YAGEO RT0805DRD0740R2L and AT series parts meet all electrical and mechanical substitution criteria. Both manufacturers produce thin-film 0805 resistors with identical resistance, tolerance options, and operating specifications. Cross-manufacturer substitution is valid.
Q: What is the significance of "Thin Film" composition?
A: Thin film construction provides superior precision, stability, and temperature coefficient performance compared to thick film resistors. All listed substitutes maintain thin film composition, ensuring consistent electrical characteristics across the temperature range.
Q: Does the anti-sulfur feature in YAGEO AT series parts affect compatibility?
A: No. Anti-sulfur treatment is an additional protective feature that enhances reliability in corrosive environments. It does not affect electrical performance or compatibility with standard circuit designs. This feature is beneficial for harsh environment applications.
Q: Are there any package dimension differences between substitute parts?
A: All parts conform to 0805 (2012 Metric) package specification: 0.079" L × 0.049" W (2.00mm × 1.25mm). Height variations are minimal (0.024" to 0.033" seated height). All parts are mechanically interchangeable on standard PCB layouts designed for 0805 components.
Q: What is the temperature coefficient ±25ppm/°C specification?
A: Temperature coefficient indicates resistance change per degree Celsius. ±25ppm/°C means the resistance value changes by a maximum of 25 parts per million per °C across the operating range. All listed substitutes maintain this specification, ensuring consistent performance across -55°C to 155°C.
Q: Can I use PHP00805E40R2BST1 (0.63W) in place of the 0.1W original part?
A: Yes. The 0.63W rating provides significantly higher thermal capacity. The resistor will operate well within safe limits with additional margin. This is appropriate for applications requiring enhanced reliability or where circuit dissipation may vary.
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