RN732ATTD4591B50 Equivalent & Substitute Parts

Part Overview

The RN732ATTD4591B50 is a 4.59 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 functionally equivalent alternatives from active product lines. Substitute parts maintain the same resistance value, tolerance, and package footprint while offering enhanced power ratings, automotive certifications, or improved compliance status.

Key Parameters

Parameter	Value
Resistance	4.59 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 Sensitivity Level	1 (Unlimited)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following criteria:

Primary Compatibility Requirements:

Resistance value: 4.59 kOhms (exact match required)
Tolerance: ±0.1% (exact match required)
Package / Case: 0805 (2012 Metric) (exact match required)
Composition: Thin Film (exact match required)
Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

Secondary Compatibility Parameters (Upgradeable):

Power Rating: Equal to or greater than 0.1W
Temperature Coefficient: Equal to or lower absolute value
Operating Temperature Range: Equal to or exceeding -55°C ~ 155°C
RoHS Status: ROHS3 Compliant preferred; non-compliant parts listed with notation
Certifications: AEC-Q200 automotive qualification available in substitute options

All substitute parts listed maintain exact matches for primary requirements. Variations in secondary parameters represent functional upgrades or alternative certifications suitable for specific application requirements.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Temp Range (°C)	Product Status	RoHS	Certifications
RN732ATTD4591B50	KOA Speer	4.59k	±0.1%	0.1	±50	-55 ~ 155	Obsolete	ROHS3	None
RN73R2ATTD4591B50	KOA Speer	4.59k	±0.1%	0.125	±50	-55 ~ 155	Active	ROHS3	AEC-Q200
PAT0805E4591BST1	Vishay Dale	4.59k	±0.1%	0.2	±25	-55 ~ 155	Active	ROHS3	AEC-Q200
PHP00805E4591BBT1	Vishay Dale	4.59k	±0.1%	0.63	±25	-55 ~ 155	Active	Non-compliant	None
PHP00805E4591BST1	Vishay Dale	4.59k	±0.1%	0.63	±25	-55 ~ 155	Active	ROHS3	None
PHP00805H4591BBT1	Vishay Dale	4.59k	±0.1%	0.63	±50	-55 ~ 155	Active	Non-compliant	None
PHP00805H4591BST1	Vishay Dale	4.59k	±0.1%	0.63	±50	-55 ~ 155	Active	ROHS3	None
TNPW08054K59BEEA	Vishay Dale	4.59k	±0.1%	0.26	±25	-55 ~ 175	Active	ROHS3	AEC-Q200
TNPW08054K59BEEN	Vishay Dale	4.59k	±0.1%	0.26	±25	-55 ~ 175	Active	ROHS3	AEC-Q200
TNPW08054K59BETY	Vishay Dale	4.59k	±0.1%	0.125	±25	-55 ~ 125	Active	Non-compliant	Military

Engineering Selection Recommendations

For Direct Replacement (Minimum Upgrade): RN73R2ATTD4591B50 is the primary substitute. It maintains KOA Speer manufacturing continuity, increases power rating from 0.1W to 0.125W, and adds AEC-Q200 automotive qualification while preserving ROHS3 compliance and identical temperature coefficient. Product status is active with 868 units in stock.

For Enhanced Thermal Performance: TNPW08054K59BEEA or TNPW08054K59BEEN provide improved temperature coefficient (±25ppm/°C versus ±50ppm/°C), extended operating range to 175°C, and AEC-Q200 certification. Power rating increases to 0.26W. Both maintain ROHS3 compliance. TNPW08054K59BEEN has higher inventory (2185 units).

For Maximum Power Headroom: PHP00805E4591BST1 or PHP00805H4591BST1 deliver 0.63W power rating with flame-proof and safety features. PHP00805E4591BST1 offers ±25ppm/°C temperature coefficient with ROHS3 compliance. PHP00805H4591BST1 maintains ±50ppm/°C matching the original part. Both are active products.

For Automotive Applications: PAT0805E4591BST1 combines AEC-Q200 qualification, improved ±25ppm/°C temperature coefficient, 0.2W power rating, and ROHS3 compliance in a single active product (1112 units in stock).

Compliance Considerations: All recommended substitutes maintain ROHS3 compliance except TNPW08054K59BETY (military specification, non-compliant) and PHP00805E4591BBT1, PHP00805H4591BBT1 (non-compliant variants). For RoHS-regulated applications, exclude these three options.

Frequently Asked Questions (FAQ)

Q: Can RN732ATTD4591B50 be replaced with any 4.59k resistor in 0805 package? A: No. Substitutes must match the exact resistance (4.59 kOhms), tolerance (±0.1%), composition (thin film), and moisture sensitivity level (MSL 1). Package footprint alone is insufficient for qualification.

Q: What is the difference between RN73R2ATTD4591B50 and the original RN732ATTD4591B50? A: RN73R2ATTD4591B50 increases power rating from 0.1W to 0.125W, adds AEC-Q200 automotive qualification, and transitions from obsolete to active product status. All other electrical parameters remain identical. It is the recommended direct replacement.

Q: Why do some substitutes have lower temperature coefficients (±25ppm/°C)? A: Lower temperature coefficients indicate improved stability across temperature variations. This is a functional upgrade, not a limitation. Parts with ±25ppm/°C provide tighter resistance tolerance maintenance over the operating temperature range compared to ±50ppm/°C parts.

Q: Are PHP series resistors (0.63W) suitable for applications designed for 0.1W? A: Yes. Higher power ratings are backward compatible. A 0.63W resistor can be used in circuits designed for 0.1W operation. The resistor will operate at lower stress levels, potentially improving reliability. Physical dimensions are slightly larger (height 0.033" versus 0.024"), which must be verified against PCB layout constraints.

Q: What does AEC-Q200 certification mean? A: AEC-Q200 is an automotive qualification standard. Parts bearing this certification meet automotive industry reliability and performance requirements. These parts are suitable for both automotive and general industrial applications.

Q: Can TNPW08054K59BETY be used in RoHS-regulated applications? A: No. TNPW08054K59BETY is RoHS non-compliant and REACH-affected. It is restricted for use in RoHS-regulated markets and applications. Use TNPW08054K59BEEA or TNPW08054K59BEEN instead for RoHS compliance.

Q: What is the inventory status for immediate availability? A: TNPW08054K59BEEN has the highest inventory (2185 units). PAT0805E4591BST1 has 1112 units. RN73R2ATTD4591B50 has 868 units. All listed substitutes are in stock as new original components.

Q: Do all substitutes maintain the same physical footprint? A: All parts use 0805 (2012 Metric) package with identical length (0.079" to 0.080") and width (0.049" to 0.050"). Height varies: original and most substitutes are 0.024" to 0.022", while PHP series parts are 0.033". Verify PCB clearance for PHP series before substitution.

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