RN732BTTD4591B50 Equivalent & Substitute Parts

Part Overview

The RN732BTTD4591B50 is a 4.59 kOhms ±0.1% 0.125W thin film chip resistor in 1206 (3216 Metric) package manufactured by KOA Speer Electronics, Inc. This part is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for production and repair applications.

Key Parameters

Parameter	Value
Resistance	4.59 kOhms
Tolerance	±0.1%
Power Rating	0.125W (1/8W)
Composition	Thin Film
Package / Case	1206 (3216 Metric)
Temperature Coefficient	±50ppm/°C
Operating Temperature Range	-55°C ~ 155°C
Features	Moisture Resistant
Packaging Type	Tape & Reel (TR)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the RN732BTTD4591B50 are qualified based on the following electrical and mechanical parameters:

Core Substitution Criteria:

Resistance value: 4.59 kOhms
Tolerance: ±0.1%
Package / Case: 1206 (3216 Metric)
Composition: Thin Film
Moisture Sensitivity Level: 1 (Unlimited)
Operating Temperature Range: -55°C minimum and 155°C maximum (or compatible subset)

Allowable Variations:

Power rating: Equal to or greater than 0.125W
Temperature Coefficient: Equal to or lower absolute value
Features: Additional features (Automotive AEC-Q200, Military, Anti-Sulfur, Non-Inductive) do not disqualify substitution
Product Status: Active products are preferred over obsolete
RoHS Compliance: ROHS3 Compliant preferred; RoHS non-compliant parts noted for compliance-sensitive applications

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Operating Temp (°C)	Features	Product Status	RoHS Status
RN732BTTD4591B50	KOA Speer Electronics, Inc.	4.59 kOhms	±0.1%	0.125	±50	-55 ~ 155	Moisture Resistant	Obsolete	ROHS3 Compliant
RN73R2BTTD4591B50	KOA Speer Electronics, Inc.	4.59 kOhms	±0.1%	0.25	±50	-55 ~ 155	Automotive AEC-Q200, Moisture Resistant	Active	ROHS3 Compliant
PTN1206E4591BST1	Vishay Dale Thin Film	4.59 kOhms	±0.1%	0.4	±25	-55 ~ 155	Anti-Sulfur, Moisture Resistant, Non-Inductive	Active	ROHS3 Compliant
TNPW12064K59BETA	Vishay Dale	4.59 kOhms	±0.1%	0.25	±25	-55 ~ 125	Military	Active	RoHS non-compliant
TNPW12064K59BETY	Vishay Dale	4.59 kOhms	±0.1%	0.25	±25	-55 ~ 125	Military	Active	RoHS non-compliant
TNPW12064K59BXTA	Vishay Dale	4.59 kOhms	±0.1%	0.25	±15	-55 ~ 125	Military	Active	RoHS non-compliant
TNPW12064K59BYCN	Vishay Dale	4.59 kOhms	±0.1%	0.25	±10	-55 ~ 125	Military	Active	RoHS non-compliant

Engineering Selection Recommendations

Primary Substitute (Direct Replacement): RN73R2BTTD4591B50 is the recommended primary substitute. It maintains the same manufacturer (KOA Speer Electronics, Inc.), identical electrical specifications (4.59 kOhms ±0.1%, ±50ppm/°C), full operating temperature range (-55°C ~ 155°C), ROHS3 compliance, and 1206 package. The increased power rating (0.25W vs. 0.125W) provides design margin without affecting circuit performance. Active product status ensures ongoing availability.

Secondary Substitutes (Enhanced Performance): PTN1206E4591BST1 (Vishay Dale Thin Film) offers higher power rating (0.4W), improved temperature coefficient (±25ppm/°C), and additional features (Anti-Sulfur, Non-Inductive). Full operating temperature range (-55°C ~ 155°C) and ROHS3 compliance maintained. Suitable for applications requiring enhanced thermal performance or sulfur-resistant environments.

Alternative Substitutes (Military Grade): TNPW12064K59BETA, TNPW12064K59BETY, TNPW12064K59BXTA, and TNPW12064K59BYCN (Vishay Dale) are military-grade thin film resistors with active product status. These parts feature improved temperature coefficients (±25ppm/°C, ±15ppm/°C, or ±10ppm/°C) and 0.25W power rating. Operating temperature range is limited to -55°C ~ 125°C. RoHS non-compliance requires evaluation for regulatory requirements. Selection among these variants depends on temperature coefficient requirements and compliance constraints.

Frequently Asked Questions (FAQ)

Q: Can RN73R2BTTD4591B50 directly replace RN732BTTD4591B50? A: Yes. Both parts share identical resistance (4.59 kOhms), tolerance (±0.1%), temperature coefficient (±50ppm/°C), operating temperature range (-55°C ~ 155°C), package (1206), and composition (thin film). The higher power rating (0.25W vs. 0.125W) is a beneficial upgrade that does not affect compatibility.

Q: What is the difference between the Vishay Dale TNPW series variants? A: All TNPW12064K59 variants (BETA, BETY, BXTA, BYCN) share identical resistance, tolerance, power rating, and package. They differ in temperature coefficient (±25ppm/°C, ±15ppm/°C, or ±10ppm/°C) and are designated for military applications. Selection depends on circuit temperature stability requirements.

Q: Are there RoHS compliance differences among substitutes? A: Yes. RN732BTTD4591B50, RN73R2BTTD4591B50, and PTN1206E4591BST1 are ROHS3 Compliant. TNPW series parts (BETA, BETY, BXTA, BYCN) are RoHS non-compliant. Applications subject to RoHS regulations must use compliant alternatives.

Q: What is the maximum operating temperature for each substitute? A: RN732BTTD4591B50, RN73R2BTTD4591B50, and PTN1206E4591BST1 support -55°C ~ 155°C. TNPW series parts support -55°C ~ 125°C. Applications requiring operation above 125°C must use KOA or Vishay PTN series parts.

Q: Can PTN1206E4591BST1 be used in place of RN732BTTD4591B50? A: Yes. PTN1206E4591BST1 meets all core substitution criteria with enhanced specifications: higher power rating (0.4W), lower temperature coefficient (±25ppm/°C), and additional features (Anti-Sulfur, Non-Inductive). Full operating temperature range (-55°C ~ 155°C) and ROHS3 compliance are maintained.

Q: Are package dimensions identical across all substitutes? A: Yes. All substitute parts use 1206 (3216 Metric) package with identical footprint dimensions (0.126" L x 0.063" W / 3.20mm x 1.60mm). Height variations are minimal (0.026" to 0.033" seated maximum) and do not affect PCB assembly compatibility.

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