RN732ATTD1981B50 Equivalent & Substitute Parts

Part Overview

The RN732ATTD1981B50 is a 1.98 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 performance characteristics or compliance certifications.

Key Parameters

Parameter	Value
Resistance	1.98 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 RN732ATTD1981B50 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters (Must Match):

Resistance value: 1.98 kOhms
Tolerance: ±0.1%
Package format: 0805 (2012 Metric)
Composition: Thin Film
Moisture Sensitivity Level: 1 (Unlimited)

Compatible Parameters (May Vary Within Limits):

Power rating: Equal to or greater than 0.1W
Temperature coefficient: ±50ppm/°C or better (lower absolute value)
Operating temperature range: Must encompass -55°C minimum and 155°C maximum
RoHS compliance: ROHS3 preferred for regulatory alignment
Additional features: Automotive AEC-Q200, anti-sulfur, flame-proof, or military ratings are acceptable enhancements

Substitute parts are grouped by power rating upgrade level, as higher power ratings provide thermal margin while maintaining identical electrical characteristics and package dimensions.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Temp Range (°C)	Status	RoHS
RN732ATTD1981B50	KOA Speer	1.98k	±0.1%	0.1	±50	-55 ~ 155	Obsolete	ROHS3
RN73R2ATTD1981B50	KOA Speer	1.98k	±0.1%	0.125	±50	-55 ~ 155	Active	ROHS3
PAT0805E1981BST1	Vishay Dale	1.98k	±0.1%	0.2	±25	-55 ~ 155	Active	ROHS3
PHP00805E1981BBT1	Vishay Dale	1.98k	±0.1%	0.63	±25	-55 ~ 155	Active	Non-compliant
PHP00805E1981BST1	Vishay Dale	1.98k	±0.1%	0.63	±25	-55 ~ 155	Active	ROHS3
PHP00805H1981BBT1	Vishay Dale	1.98k	±0.1%	0.63	±50	-55 ~ 155	Active	Non-compliant
PHP00805H1981BST1	Vishay Dale	1.98k	±0.1%	0.63	±50	-55 ~ 155	Active	ROHS3
RT0805BRD071K98L	YAGEO	1.98k	±0.1%	0.125	±25	-55 ~ 155	Active	ROHS3
TNPW08051K98BEEA	Vishay Dale	1.98k	±0.1%	0.26	±25	-55 ~ 175	Active	ROHS3
TNPW08051K98BETA	Vishay Dale	1.98k	±0.1%	0.125	±25	-55 ~ 125	Active	Non-compliant
TNPW08051K98BETY	Vishay Dale	1.98k	±0.1%	0.125	±25	-55 ~ 125	Active	Non-compliant

Engineering Selection Recommendations

Direct Equivalent (Same Power Rating):

RN73R2ATTD1981B50 from KOA Speer Electronics serves as the primary direct equivalent. This part maintains the same manufacturer lineage (RN73 series), identical electrical specifications (1.98 kOhms ±0.1%), and equivalent power rating (0.125W vs. 0.1W original). The part is active and ROHS3 compliant. Selection of this part is appropriate for direct replacement in existing designs without modification.

Recommended Upgrades (Higher Power Rating with Enhanced Specifications):

PAT0805E1981BST1 (Vishay Dale, 0.2W) provides improved thermal margin with superior temperature coefficient (±25ppm/°C vs. ±50ppm/°C). This part is active, ROHS3 compliant, and includes automotive AEC-Q200 certification and anti-sulfur features. Suitable for applications requiring enhanced reliability and automotive-grade performance.

RT0805BRD071K98L (YAGEO, 0.125W) offers active status with ROHS3 compliance and improved temperature coefficient (±25ppm/°C). Dimensions and electrical characteristics align with the original specification. Appropriate for cost-optimized designs requiring active component availability.

TNPW08051K98BEEA (Vishay Dale, 0.26W) provides extended operating temperature range (-55°C to 175°C), automotive AEC-Q200 certification, anti-sulfur construction, and ROHS3 compliance. Temperature coefficient is ±25ppm/°C. Recommended for applications requiring enhanced thermal performance and extended temperature operation.

High Power Alternatives (0.63W Rating):

PHP00805E1981BST1 and PHP00805H1981BST1 (Vishay Dale, 0.63W) deliver maximum thermal margin with flame-proof and safety-rated construction. Both are active and ROHS3 compliant. Selection depends on temperature coefficient requirement: PHP00805E1981BST1 features ±25ppm/°C, while PHP00805H1981BST1 maintains ±50ppm/°C matching the original specification.

Compliance Considerations:

Parts with RoHS non-compliance status (PHP00805E1981BBT1, PHP00805H1981BBT1, TNPW08051K98BETA, TNPW08051K98BETY) are suitable only for applications where RoHS exemptions apply or where regulatory requirements do not mandate compliance.

TNPW08051K98BETA and TNPW08051K98BETY feature military-grade construction but operate only to 125°C maximum, limiting suitability for applications requiring the full -55°C to 155°C range.

Frequently Asked Questions (FAQ)

Q: Can RN73R2ATTD1981B50 be used as a direct replacement for RN732ATTD1981B50?

A: Yes. RN73R2ATTD1981B50 maintains identical resistance (1.98 kOhms), tolerance (±0.1%), package format (0805), and composition (thin film). The power rating increase from 0.1W to 0.125W provides additional thermal margin without affecting circuit operation. Both parts feature ±50ppm/°C temperature coefficient and operate across -55°C to 155°C. RN73R2ATTD1981B50 is active and ROHS3 compliant, addressing the obsolescence of the original part.

Q: What is the significance of temperature coefficient differences between substitute parts?

A: Temperature coefficient (ppm/°C) defines resistance change per degree Celsius. The original RN732ATTD1981B50 specifies ±50ppm/°C. Substitute parts with ±25ppm/°C (PAT0805E1981BST1, RT0805BRD071K98L, TNPW08051K98BEEA) exhibit superior stability across temperature variations, reducing resistance drift in precision applications. Selection depends on circuit tolerance requirements. For general-purpose applications, both specifications are functionally equivalent.

Q: Are all substitute parts physically compatible with the original 0805 package footprint?

A: All listed substitute parts conform to 0805 (2012 Metric) package specification. Dimensions are standardized: 0.079" to 0.080" length and 0.049" to 0.050" width. Height variations exist (0.018" to 0.033" seated maximum), but these remain within PCB assembly tolerances for standard 0805 footprints. No PCB redesign is required for substitution.

Q: Which substitute part is recommended for automotive applications?

A: TNPW08051K98BEEA and PAT0805E1981BST1 both carry automotive AEC-Q200 certification. TNPW08051K98BEEA additionally provides extended temperature range (-55°C to 175°C) and anti-sulfur construction. Both are ROHS3 compliant and active. Selection between these depends on whether extended temperature operation is required.

Q: What is the difference between RoHS-compliant and non-compliant substitute parts?

A: ROHS3-compliant parts (RN73R2ATTD1981B50, PAT0805E1981BST1, PHP00805E1981BST1, PHP00805H1981BST1, RT0805BRD071K98L, TNPW08051K98BEEA) meet Restriction of Hazardous Substances directives and are suitable for applications subject to EU regulations or equivalent compliance requirements. Non-compliant parts (PHP00805E1981BBT1, PHP00805H1981BBT1, TNPW08051K98BETA, TNPW08051K98BETY) are restricted to applications where exemptions apply or regulatory requirements do not mandate compliance.

Q: Can military-grade TNPW parts substitute for the original industrial-grade RN732ATTD1981B50?

A: TNPW08051K98BETA and TNPW08051K98BETY feature military-grade construction but operate only to 125°C maximum temperature, below the original specification of 155°C. These parts are suitable only for applications where maximum operating temperature does not exceed 125°C. Both are non-RoHS compliant. For full temperature range compatibility, select TNPW08051K98BEEA instead.

Q: What power rating should be selected for thermal margin in high-dissipation circuits?

A: The original 0.1W rating provides baseline thermal capacity. Upgrades to 0.125W (RN73R2ATTD1981B50, RT0805BRD071K98L, TNPW08051K98BETA, TNPW08051K98BETY) offer modest margin. For applications with significant power dissipation or thermal stress, select 0.2W (PAT0805E1981BST1), 0.26W (TNPW08051K98BEEA), or 0.63W (PHP series) ratings. Higher power ratings reduce junction temperature and extend component life.

Q: Are there inventory considerations when selecting substitute parts?

A: All listed substitute parts are confirmed in stock with quantities ranging from 762 to 1111 pieces. RN73R2ATTD1981B50 (766 pcs), TNPW08051K98BEEA (1111 pcs), and PHP00805H1981BST1 (968 pcs) offer highest availability. Selection based on inventory status should be secondary to electrical and compliance requirements.

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