RN732ATTD4371B50 Equivalent & Substitute Parts

Part Overview

The RN732ATTD4371B50 is a 4.37 kOhms ±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 while offering enhanced features or improved availability.

Key Parameters

Parameter	Value
Resistance	4.37 kOhms
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 Resistance	Yes
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the RN732ATTD4371B50 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Compatibility Parameters:

Resistance value: 4.37 kOhms (exact match required)
Tolerance: ±0.1% (exact match required)
Package format: 0805 (2012 Metric) (exact match required)
Composition: Thin Film (exact match required)
Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

Allowable Variation Parameters:

Power rating: Equal to or greater than 0.1W
Temperature coefficient: Equal to or lower absolute value (±25ppm/°C acceptable; ±50ppm/°C acceptable)
Operating temperature range: Equal to or exceeding -55°C ~ 155°C
Additional features: May include automotive qualification (AEC-Q200), anti-sulfur coating, flame-proof construction, or military specifications
RoHS compliance: ROHS3 Compliant preferred; RoHS non-compliant parts listed with status noted

All substitute parts listed maintain the core electrical specifications (4.37 kOhms, ±0.1% tolerance) and mechanical compatibility (0805 package, thin film construction) while offering equal or superior power ratings and environmental performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Temp Range (°C)	Package	Features	Status	RoHS
RN732ATTD4371B50	KOA Speer	4.37k	±0.1%	0.1	±50	-55 ~ 155	0805	Moisture Resistant	Obsolete	ROHS3
RN73R2ATTD4371B50	KOA Speer	4.37k	±0.1%	0.125	±50	-55 ~ 155	0805	Automotive AEC-Q200, Moisture Resistant	Active	ROHS3
PAT0805E4371BST1	Vishay Dale	4.37k	±0.1%	0.2	±25	-55 ~ 155	0805	Anti-Sulfur, Automotive AEC-Q200, Moisture Resistant	Active	ROHS3
PHP00805E4371BBT1	Vishay Dale	4.37k	±0.1%	0.63	±25	-55 ~ 155	0805	Flame Proof, Moisture Resistant, Safety	Active	Non-compliant
PHP00805E4371BST1	Vishay Dale	4.37k	±0.1%	0.63	±25	-55 ~ 155	0805	Flame Proof, Moisture Resistant, Safety	Active	ROHS3
PHP00805H4371BBT1	Vishay Dale	4.37k	±0.1%	0.63	±50	-55 ~ 155	0805	Flame Proof, Moisture Resistant, Safety	Active	Non-compliant
PHP00805H4371BST1	Vishay Dale	4.37k	±0.1%	0.63	±50	-55 ~ 155	0805	Flame Proof, Moisture Resistant, Safety	Active	ROHS3
RNCF0805BKE4K37	Stackpole Electronics	4.37k	±0.1%	0.25	±25	-55 ~ 155	0805	Automotive AEC-Q200	Active	ROHS3
TNPW08054K37BECN	Vishay Dale	4.37k	±0.1%	0.125	±25	-55 ~ 125	0805	Military	Active	Non-compliant
TNPW08054K37BEEA	Vishay Dale	4.37k	±0.1%	0.26	±25	-55 ~ 175	0805	Anti-Sulfur, Automotive AEC-Q200, Moisture Resistant	Active	ROHS3
TNPW08054K37BETA	Vishay Dale	4.37k	±0.1%	0.125	±25	-55 ~ 125	0805	Military	Active	Non-compliant

Engineering Selection Recommendations

Direct Equivalent (Same Power Rating): No active substitute maintains the exact 0.1W power rating. The RN732ATTD4371B50 is obsolete with no direct active equivalent from the same manufacturer.

Recommended Primary Substitutes (Higher Power Rating, Active Status):

RN73R2ATTD4371B50 (KOA Speer Electronics) – Active status, same manufacturer lineage, 0.125W rating, identical temperature coefficient and operating range, ROHS3 compliant. Suitable for direct replacement in applications where 0.1W minimum power dissipation is required.
TNPW08054K37BEEA (Vishay Dale) – Active status, 0.26W rating, extended operating temperature range (-55°C ~ 175°C), automotive AEC-Q200 qualified, anti-sulfur coating, ROHS3 compliant. Recommended for applications requiring enhanced thermal margin and extended temperature performance.
RNCF0805BKE4K37 (Stackpole Electronics) – Active status, 0.25W rating, automotive AEC-Q200 qualified, ROHS3 compliant, ±25ppm/°C temperature coefficient. Suitable for automotive and industrial applications.

Secondary Substitutes (Higher Power Rating, Specialized Features):

PAT0805E4371BST1 (Vishay Dale) – 0.2W rating, automotive AEC-Q200 qualified, anti-sulfur coating, ROHS3 compliant, ±25ppm/°C temperature coefficient.
PHP00805E4371BST1 (Vishay Dale) – 0.63W rating, flame-proof and safety-rated construction, ROHS3 compliant, ±25ppm/°C temperature coefficient. For applications requiring enhanced safety certifications.
PHP00805H4371BST1 (Vishay Dale) – 0.63W rating, flame-proof and safety-rated construction, ROHS3 compliant, ±50ppm/°C temperature coefficient (matches original). For applications requiring enhanced safety certifications with original temperature coefficient.

Military/Specialized Applications:

TNPW08054K37BECN or TNPW08054K37BETA (Vishay Dale) – Military-grade thin film resistors, 0.125W rating, ±25ppm/°C temperature coefficient. Note: Operating temperature range limited to -55°C ~ 125°C (lower than original). RoHS non-compliant status requires verification against procurement requirements.

Selection Criteria by Application:

Standard Commercial/Industrial: RN73R2ATTD4371B50 or RNCF0805BKE4K37
Automotive Applications: TNPW08054K37BEEA, RNCF0805BKE4K37, or PAT0805E4371BST1
High-Reliability/Safety-Critical: PHP00805E4371BST1 or PHP00805H4371BST1
Extended Temperature Range: TNPW08054K37BEEA (-55°C ~ 175°C)
Military Specifications: TNPW08054K37BECN or TNPW08054K37BETA

Frequently Asked Questions (FAQ)

Q1: Can I use a higher power-rated resistor as a substitute for the RN732ATTD4371B50?

A: Yes. All listed substitute parts maintain the 4.37 kOhms resistance value, ±0.1% tolerance, and 0805 package format. Higher power ratings (0.125W, 0.2W, 0.25W, 0.26W, or 0.63W) are electrically compatible and provide additional thermal margin. Power rating substitution is unidirectional: higher ratings are acceptable; lower ratings are not.

Q2: What is the significance of the temperature coefficient difference between ±50ppm/°C and ±25ppm/°C?

A: Temperature coefficient defines resistance drift over operating temperature range. The original RN732ATTD4371B50 specifies ±50ppm/°C; substitute parts with ±25ppm/°C offer superior stability and tighter tolerance maintenance across temperature extremes. This is a performance upgrade, not a compatibility issue. Applications requiring the original ±50ppm/°C specification can use PHP00805H4371BBT1 or PHP00805H4371BST1.

Q3: Are all substitute parts physically interchangeable in the 0805 package?

A: Yes. All substitute parts use the 0805 (2012 Metric) package format with identical footprint dimensions (0.079" L x 0.049" W / 2.00mm x 1.25mm). Height variations exist (0.022" to 0.033" seated height) but remain within standard PCB assembly tolerances. Verify specific height constraints if space-limited applications exist.

Q4: What does "Automotive AEC-Q200" qualification mean?

A: AEC-Q200 is the Automotive Electronics Council qualification standard for passive components. It certifies the component for automotive-grade reliability, temperature cycling, moisture resistance, and failure rate performance. Parts with this qualification (RN73R2ATTD4371B50, PAT0805E4371BST1, RNCF0805BKE4K37, TNPW08054K37BEEA) are suitable for automotive and high-reliability applications.

Q5: Why is RoHS compliance status different across substitute parts?

A: RoHS (Restriction of Hazardous Substances) compliance is a regulatory requirement that varies by manufacturing process and material composition. ROHS3-compliant parts (preferred) meet current EU and global environmental standards. Non-compliant parts (TNPW08054K37BECN, TNPW08054K37BETA, PHP00805E4371BBT1, PHP00805H4371BBT1) may be restricted in certain markets or applications. Verify procurement requirements before selection.

Q6: What does "Anti-Sulfur" coating mean?

A: Anti-sulfur coating protects resistor terminations from sulfur-induced corrosion in high-sulfur environments (industrial, marine, or polluted atmospheres). Parts with this feature (PAT0805E4371BST1, TNPW08054K37BEEA) offer extended reliability in corrosive environments. Standard parts without this coating are suitable for controlled indoor environments.

Q7: Can I substitute the RN732ATTD4371B50 with a military-grade resistor?

A: Yes. TNPW08054K37BECN and TNPW08054K37BETA are military-grade alternatives with identical resistance and tolerance. However, note the reduced operating temperature range (-55°C ~ 125°C versus original -55°C ~ 155°C). Verify application temperature requirements before selection. RoHS non-compliance status requires verification against procurement specifications.

Q8: What is the difference between PHP00805E4371BST1 and PHP00805H4371BST1?

A: Both are 0.63W, flame-proof, safety-rated resistors. The primary difference is temperature coefficient: PHP00805E4371BST1 specifies ±25ppm/°C, while PHP00805H4371BST1 specifies ±50ppm/°C (matching the original). Additionally, PHP00805E4371BST1 is RoHS non-compliant, while PHP00805H4371BST1 is ROHS3 compliant. Select based on temperature stability requirements and regulatory compliance needs.

Q9: Is the RN73R2ATTD4371B50 the best direct replacement?

A: RN73R2ATTD4371B50 is the most direct replacement from the same manufacturer (KOA Speer), with identical temperature coefficient (±50ppm/°C), operating range (-55°C ~ 155°C), and only a marginal power increase (0.125W versus 0.1W). It is active status and ROHS3 compliant. This is the recommended choice for applications requiring minimal design changes.

Q10: What inventory status should I consider?

A: All listed substitute parts are in active production with confirmed inventory availability (702–1069 pieces in stock). The original RN732ATTD4371B50 is obsolete with limited remaining inventory (1039 pieces). For long-term supply chain stability, select from active-status parts: RN73R2ATTD4371B50, PAT0805E4371BST1, PHP series, RNCF0805BKE4K37, or TNPW series.

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