RN731ETTP2052F25 Equivalent & Substitute Parts

Part Overview

The RN731ETTP2052F25 is a 20.5 kOhms ±1% thin film chip resistor in 0402 (1005 Metric) package rated at 1/16W (0.063W) power dissipation. Manufactured by KOA Speer Electronics, Inc., this component is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary to ensure design continuity and supply chain reliability for new production runs and long-term availability.

Key Parameters

Parameter	Value
Resistance	20.5 kOhms
Tolerance	±1%
Power Rating	0.063W (1/16W)
Package / Case	0402 (1005 Metric)
Composition	Thin Film
Temperature Coefficient	±25ppm/°C
Operating Temperature Range	-55°C ~ 155°C
Moisture Sensitivity Level	MSL 1 (Unlimited)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the RN731ETTP2052F25 are grouped based on strict electrical and mechanical compatibility criteria:

Direct Substitutes (Equivalent Performance): Parts maintaining identical or tighter tolerance specifications (±1% or better), matching resistance value (20.5 kOhms), identical power rating (1/16W), and identical package (0402). These parts are pin-compatible and functionally interchangeable without circuit redesign.

Upgrade Substitutes (Enhanced Performance): Parts with superior tolerance specifications (±0.1%, ±0.25%, ±0.5%) while maintaining all other critical parameters. These provide improved accuracy and stability but remain mechanically and electrically compatible.

Key Parameters Determining Substitutability:

Resistance value: 20.5 kOhms (exact match required)
Tolerance: ±1% minimum (tighter tolerances acceptable)
Power rating: 1/16W (0.063W) minimum
Package: 0402 (1005 Metric) (exact match required)
Composition: Thin Film
Temperature coefficient: ±25ppm/°C
Operating temperature: -55°C ~ 155°C minimum range
Moisture sensitivity: MSL 1 or better
RoHS compliance: ROHS3 Compliant

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Composition	Temp Coeff (ppm/°C)	Operating Temp (°C)	Package	Product Status	Features
RN731ETTP2052F25	KOA Speer Electronics	20.5k	±1%	0.063	Thin Film	±25	-55 ~ 155	0402	Obsolete	Moisture Resistant
RN73R1ETTP2052F25	KOA Speer Electronics	20.5k	±1%	0.063	Thin Film	±25	-55 ~ 155	0402	Active	Automotive AEC-Q200, Moisture Resistant
RT0402FRD0720K5L	YAGEO	20.5k	±1%	0.063	Thin Film	±25	-55 ~ 155	0402	Active	—
AT0402BRD0720K5L	YAGEO	20.5k	±0.1%	0.063	Thin Film	±25	-55 ~ 155	0402	Active	Anti-Sulfur, Automotive AEC-Q200, Moisture Resistant
AT0402CRD0720K5L	YAGEO	20.5k	±0.25%	0.063	Thin Film	±25	-55 ~ 155	0402	Active	Anti-Sulfur, Automotive AEC-Q200, Moisture Resistant
AT0402DRD0720K5L	YAGEO	20.5k	±0.5%	0.063	Thin Film	±25	-55 ~ 155	0402	Active	Anti-Sulfur, Automotive AEC-Q200, Moisture Resistant
CPF0402B20K5E1	TE Connectivity Passive Product	20.5k	±0.1%	0.063	Thin Film	±25	-55 ~ 155	0402	Active	—
CRT0402-BY-2052GLF	Bourns Inc.	20.5k	±0.1%	0.063	Thin Film	±25	-55 ~ 155	0402	Active	Current Sense
ERA-2AEB2052X	Panasonic Electronic Components	20.5k	±0.1%	0.063	Thin Film	±25	-55 ~ 155	0402	Active	Automotive AEC-Q200
MCS04020D2052BE100	Vishay Beyschlag/Draloric/BC Components	20.5k	±0.1%	0.063	Thin Film	±25	-55 ~ 125	0402	Active	Anti-Sulfur
RG1005P-2052-B-T5	Susumu	20.5k	±0.1%	0.063	Thin Film	±25	-55 ~ 155	0402	Active	Anti-Sulfur, Automotive AEC-Q200

Engineering Selection Recommendations

For Direct Replacement (Equivalent Performance):

RN73R1ETTP2052F25 (KOA Speer Electronics): Active product from the same manufacturer as the obsolete part. Maintains ±1% tolerance and adds Automotive AEC-Q200 qualification, providing enhanced reliability for automotive applications without performance compromise.
RT0402FRD0720K5L (YAGEO): Active product with matching ±1% tolerance and identical electrical specifications. Suitable for general-purpose applications requiring direct functional equivalence.

For Upgraded Performance (Enhanced Tolerance):

AT0402BRD0720K5L, AT0402CRD0720K5L, AT0402DRD0720K5L (YAGEO): Active products with improved tolerance specifications (±0.1%, ±0.25%, ±0.5% respectively). All include Automotive AEC-Q200 certification and anti-sulfur features. Recommended for precision applications or automotive designs.
CPF0402B20K5E1 (TE Connectivity): Active product with ±0.1% tolerance. Suitable for applications requiring higher accuracy than the original ±1% specification.
ERA-2AEB2052X (Panasonic): Active product with ±0.1% tolerance and Automotive AEC-Q200 certification. Recommended for automotive applications requiring precision performance.
RG1005P-2052-B-T5 (Susumu): Active product with ±0.1% tolerance, anti-sulfur features, and Automotive AEC-Q200 certification. Suitable for automotive and harsh environment applications.
MCS04020D2052BE100 (Vishay): Active product with ±0.1% tolerance and anti-sulfur features. Operating temperature range extends to -55°C ~ 125°C (narrower than original). Suitable for precision applications within this temperature range.
CRT0402-BY-2052GLF (Bourns): Active product with ±0.1% tolerance and current sense capability. Recommended for applications requiring precision current sensing functionality.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with tighter tolerance (±0.1%) in place of the original ±1% part? A: Yes. Tighter tolerance specifications are backward compatible. A ±0.1% part will function correctly in any circuit designed for ±1% tolerance, providing improved accuracy and stability.

Q: Are all substitute parts mechanically compatible with the original 0402 package? A: Yes. All listed substitutes use the identical 0402 (1005 Metric) package with the same footprint dimensions (0.039" L x 0.020" W / 1.00mm x 0.50mm). Height variations are minimal (0.014" to 0.016" seated height) and do not affect PCB assembly compatibility.

Q: What is the difference between direct substitutes and upgrade substitutes? A: Direct substitutes maintain the original ±1% tolerance specification and are functionally equivalent. Upgrade substitutes offer improved tolerance (±0.1%, ±0.25%, ±0.5%) for applications requiring higher precision, while remaining electrically and mechanically compatible.

Q: Which substitute should I choose for automotive applications? A: Parts with Automotive AEC-Q200 certification are recommended: RN73R1ETTP2052F25, AT0402BRD0720K5L, AT0402CRD0720K5L, AT0402DRD0720K5L, ERA-2AEB2052X, and RG1005P-2052-B-T5. These meet automotive reliability and qualification standards.

Q: Does the operating temperature range affect substitutability? A: The original part operates from -55°C ~ 155°C. Most substitutes match this range. MCS04020D2052BE100 has a narrower range (-55°C ~ 125°C) and should only be used if your application operates within this temperature window.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant, matching the original part's environmental compliance status.

Q: What is the significance of anti-sulfur features in some substitute parts? A: Anti-sulfur features provide enhanced resistance to sulfur-containing environments, improving long-term reliability in harsh conditions. This is an optional enhancement not present in the original part but available in several substitutes.

Q: Can I mix different substitute parts in the same circuit board? A: Yes, provided all parts meet the circuit's tolerance and temperature requirements. However, for consistency and supply chain management, using a single substitute part number across a design is recommended.

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