RN732ATTD1841B50 Equivalent & Substitute Parts Reference

Part Overview

The RN732ATTD1841B50 is a 1.84 kOhm ±0.1% thin film chip resistor manufactured by KOA Speer Electronics in 0805 (2012 Metric) package format with 0.1W power rating. This component is classified as obsolete product status. Substitute parts are necessary to maintain design continuity and ensure supply chain availability for new production runs and field replacements. Equivalent and upgraded alternatives maintain the core electrical specifications while offering enhanced features, improved compliance certifications, or higher power ratings suitable for demanding applications.

Key Parameters

Parameter	Value	Specification Basis
Resistance Value	1.84 kOhms	Core electrical requirement
Tolerance	±0.1%	Precision specification
Power Rating	0.1W (1/10W) minimum	Thermal design requirement
Package Type	0805 (2012 Metric)	PCB footprint compatibility
Composition	Thin Film	Temperature coefficient and stability
Operating Temperature Range	-55°C to 155°C minimum	Environmental operating limits
Moisture Resistance	Required	Environmental protection
Terminations	2	Standard chip resistor configuration

Substitute Part Grouping Explanation

Substitute parts for RN732ATTD1841B50 are classified into two categories based on substitution compatibility:

Direct Substitutes (Same Power Rating Category): Parts maintaining the 0.1W to 0.125W power rating range with identical resistance, tolerance, and package specifications. These include RN73R2ATTD1841B50 (KOA Speer, 1/8W, Active status) and TNPW08051K84BETA (Vishay Dale, 1/8W, Military grade).

Upgraded Substitutes (Higher Power Rating): Parts with increased power dissipation capability (0.2W to 0.63W) while maintaining 1.84 kOhm resistance, ±0.1% tolerance, and 0805 package format. These upgrades provide thermal margin for applications requiring higher power handling without PCB redesign. Includes PAT0805E1841BST1 (0.2W), PHP00805E1841BST1 (0.63W), PHP00805H1841BST1 (0.63W), and TNPW08051K84BEEA (0.26W).

Substitution Criteria: All substitute parts must satisfy: (1) Identical resistance value 1.84 kOhms, (2) Tolerance ±0.1%, (3) 0805 package format, (4) Thin film composition, (5) Moisture resistant construction, (6) Operating temperature range minimum -55°C to 155°C, (7) Two terminations.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Op Temp Range	Features	Status	RoHS
RN732ATTD1841B50	KOA Speer	1.84k	±0.1%	0.1	±50	-55 to 155°C	Moisture Resistant	Obsolete	ROHS3
RN73R2ATTD1841B50	KOA Speer	1.84k	±0.1%	0.125	±50	-55 to 155°C	AEC-Q200, Moisture Resistant	Active	ROHS3
PAT0805E1841BST1	Vishay Dale	1.84k	±0.1%	0.2	±25	-55 to 155°C	Anti-Sulfur, AEC-Q200, Moisture Resistant	Active	ROHS3
PHP00805E1841BBT1	Vishay Dale	1.84k	±0.1%	0.63	±25	-55 to 155°C	Flame Proof, Moisture Resistant, Safety	Active	Non-compliant
PHP00805E1841BST1	Vishay Dale	1.84k	±0.1%	0.63	±25	-55 to 155°C	Flame Proof, Moisture Resistant, Safety	Active	ROHS3
PHP00805H1841BBT1	Vishay Dale	1.84k	±0.1%	0.63	±50	-55 to 155°C	Flame Proof, Moisture Resistant, Safety	Active	Non-compliant
PHP00805H1841BST1	Vishay Dale	1.84k	±0.1%	0.63	±50	-55 to 155°C	Flame Proof, Moisture Resistant, Safety	Active	ROHS3
TNPW08051K84BEEA	Vishay Dale	1.84k	±0.1%	0.26	±25	-55 to 175°C	Anti-Sulfur, AEC-Q200, Moisture Resistant	Active	ROHS3
TNPW08051K84BETA	Vishay Dale	1.84k	±0.1%	0.125	±25	-55 to 125°C	Military	Active	Non-compliant
TNPW08051K84BETY	Vishay Dale	1.84k	±0.1%	0.125	±25	-55 to 125°C	Military	Active	Non-compliant
TNPW08051K84BHEA	Vishay Dale	1.84k	±0.1%	0.26	±50	-55 to 175°C	Anti-Sulfur, AEC-Q200, Moisture Resistant	Active	ROHS3

Engineering Selection Recommendations

For Direct Replacement (Obsolete Part Continuity): RN73R2ATTD1841B50 from KOA Speer Electronics provides the closest functional equivalent with Active product status. This part maintains identical resistance, tolerance, and package specifications while offering automotive AEC-Q200 qualification and improved supply availability. Temperature coefficient remains ±50ppm/°C, matching the original specification.

For RoHS3 Compliant Applications: Select from ROHS3 Compliant options: RN73R2ATTD1841B50, PAT0805E1841BST1, PHP00805E1841BST1, PHP00805H1841BST1, TNPW08051K84BEEA, or TNPW08051K84BHEA. All maintain full electrical compatibility while satisfying RoHS3 requirements.

For Automotive Applications (AEC-Q200): RN73R2ATTD1841B50, PAT0805E1841BST1, TNPW08051K84BEEA, and TNPW08051K84BHEA carry AEC-Q200 automotive qualification. These parts are suitable for automotive-grade circuit designs.

For Extended Temperature Range: TNPW08051K84BEEA and TNPW08051K84BHEA support -55°C to 175°C operating range, exceeding the original -55°C to 155°C specification. These are applicable for high-temperature environments.

For Higher Power Dissipation: PAT0805E1841BST1 (0.2W), PHP00805E1841BST1 (0.63W), PHP00805E1841BST1 (0.63W), PHP00805H1841BST1 (0.63W), and PHP00805H1841BST1 (0.63W) provide increased thermal capability. Select based on circuit power requirements without requiring PCB layout modifications.

For Military Applications: TNPW08051K84BETA and TNPW08051K84BETY carry Military designation. Note these parts are RoHS non-compliant and have restricted REACH status.

Frequently Asked Questions (FAQ)

Q: Can RN73R2ATTD1841B50 directly replace RN732ATTD1841B50 on existing PCBs?

A: Yes. Both parts use identical 0805 (2012 Metric) package format with matching footprint dimensions (0.079" L x 0.049" W). Electrical specifications are compatible: 1.84 kOhms ±0.1% resistance, thin film composition, and -55°C to 155°C operating range. The 1/8W power rating of RN73R2ATTD1841B50 exceeds the 1/10W requirement, providing thermal margin.

Q: What is the difference between TNPW08051K84BEEA and TNPW08051K84BHEA?

A: Both parts are Vishay Dale TNPW e3 series with 1.84 kOhms ±0.1%, 0.26W power rating, and 0805 package. The primary difference is temperature coefficient: TNPW08051K84BEEA has ±25ppm/°C while TNPW08051K84BHEA has ±50ppm/°C. TNPW08051K84BHEA matches the original ±50ppm/°C specification. Both support -55°C to 175°C operating range and carry AEC-Q200 automotive qualification.

Q: Are PHP series resistors (0.63W) suitable for applications originally designed for 0.1W?

A: Yes, from a thermal perspective. Higher power rating components can operate in lower power applications without degradation. PHP00805E1841BST1 and PHP00805H1841BST1 maintain identical electrical specifications (1.84 kOhms ±0.1%, thin film, 0805 package) while providing 6.3× thermal margin. Physical dimensions are comparable (0.080" L x 0.050" W vs. 0.079" L x 0.049" W original), with slightly increased height (0.033" vs. 0.024" seated maximum). Verify PCB clearance for height-sensitive layouts.

Q: Which substitute part has the best RoHS compliance status?

A: All ROHS3 Compliant parts meet current RoHS3 requirements: RN73R2ATTD1841B50, PAT0805E1841BST1, PHP00805E1841BST1, PHP00805H1841BST1, TNPW08051K84BEEA, and TNPW08051K84BHEA. Parts marked RoHS non-compliant (PHP00805E1841BBT1, PHP00805H1841BBT1, TNPW08051K84BETA, TNPW08051K84BETY) are restricted for new commercial designs requiring RoHS compliance.

Q: What is the temperature coefficient significance in resistor selection?

A: Temperature coefficient (ppm/°C) specifies resistance value drift per degree Celsius change. Original RN732ATTD1841B50 has ±50ppm/°C. Substitute parts offer either ±50ppm/°C (matching original) or ±25ppm/°C (improved stability). For precision analog circuits with wide temperature operation, ±25ppm/°C parts (PAT0805E1841BST1, PHP series, TNPW08051K84BEEA) provide superior performance. For general applications, both specifications are functionally equivalent.

Q: Can military-grade TNPW parts replace commercial-grade originals?

A: Electrically yes, but with compliance considerations. TNPW08051K84BETA and TNPW08051K84BETY are RoHS non-compliant and REACH Affected, restricting use in commercial products requiring environmental compliance. These parts are suitable only for military, aerospace, or legacy applications where RoHS exemptions apply. For commercial designs, select ROHS3 Compliant alternatives.

Q: What inventory status should influence part selection?

A: All substitute parts listed maintain active production status with current inventory availability (783 to 1124 pieces in stock). RN732ATTD1841B50 is obsolete with limited remaining inventory (1066 pieces). For new designs and long-term supply security, select Active status parts. For legacy system maintenance, RN73R2ATTD1841B50 provides the most direct equivalent with Active status.

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