RN731ETTP2152D25 Equivalent & Substitute Parts

Part Overview

The RN731ETTP2152D25 is a 21.5 kOhms ±0.5% thin film chip resistor in 0402 (1005 Metric) package rated at 0.063W (1/16W) with moisture resistant construction. 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 and maintenance applications.

Key Parameters

Parameter	Value
Resistance	21.5 kOhms
Tolerance	±0.5%
Power Rating	0.063W (1/16W)
Package	0402 (1005 Metric)
Composition	Thin Film
Temperature Coefficient	±25ppm/°C
Operating Temperature Range	-55°C ~ 155°C
Moisture Resistance	Yes
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the RN731ETTP2152D25 is determined by the following critical parameters:

Primary Substitution Criteria:

Resistance value: 21.5 kOhms (exact match required)
Tolerance: ±0.5% or better (tighter tolerance acceptable)
Power rating: 0.063W minimum (equal or higher acceptable)
Package: 0402 (1005 Metric) form factor (exact match required)
Composition: Thin film construction
Temperature coefficient: ±25ppm/°C or better
Operating temperature range: Must support -55°C ~ 155°C minimum
RoHS compliance: ROHS3 Compliant

Substitution Categories:

Direct Equivalents maintain identical electrical and mechanical specifications with active product status:

RN73R1ETTP2152D25 (KOA Speer, automotive-qualified variant)
RR0510P-2152-D (Susumu)
RT0402DRD0721K5L (YAGEO)

Upgrade Options provide enhanced tolerance, automotive qualification, or additional protective features while maintaining core electrical parameters:

AT0402BRD0721K5L (YAGEO, ±0.1% tolerance, AEC-Q200)
AT0402CRD0721K5L (YAGEO, ±0.25% tolerance, AEC-Q200)
AT0402DRD0721K5L (YAGEO, ±0.5% tolerance, AEC-Q200, anti-sulfur)
CPF0402B21K5E1 (TE Connectivity, ±0.1% tolerance)
ERA-2AEB2152X (Panasonic, ±0.1% tolerance, AEC-Q200)
MCS04020D2152BE100 (Vishay, ±0.1% tolerance, anti-sulfur)
RG1005N-2152-D-T10 (Susumu, AEC-Q200, anti-sulfur, ±10ppm/°C)

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power	Package	Temp Coeff	Op Temp Range	Status	AEC-Q200	Height (Max)
RN731ETTP2152D25	KOA Speer	21.5 kΩ	±0.5%	0.063W	0402	±25ppm/°C	-55°C ~ 155°C	Obsolete	No	0.40mm
RN73R1ETTP2152D25	KOA Speer	21.5 kΩ	±0.5%	0.063W	0402	±25ppm/°C	-55°C ~ 155°C	Active	Yes	0.40mm
RR0510P-2152-D	Susumu	21.5 kΩ	±0.5%	0.063W	0402	±25ppm/°C	-55°C ~ 125°C	Active	No	0.40mm
RT0402DRD0721K5L	YAGEO	21.5 kΩ	±0.5%	0.063W	0402	±25ppm/°C	-55°C ~ 155°C	Active	No	0.35mm
AT0402BRD0721K5L	YAGEO	21.5 kΩ	±0.1%	0.063W	0402	±25ppm/°C	-55°C ~ 155°C	Active	Yes	0.35mm
AT0402CRD0721K5L	YAGEO	21.5 kΩ	±0.25%	0.063W	0402	±25ppm/°C	-55°C ~ 155°C	Active	Yes	0.35mm
AT0402DRD0721K5L	YAGEO	21.5 kΩ	±0.5%	0.063W	0402	±25ppm/°C	-55°C ~ 155°C	Active	Yes	0.35mm
CPF0402B21K5E1	TE Connectivity	21.5 kΩ	±0.1%	0.063W	0402	±25ppm/°C	-55°C ~ 155°C	Active	No	0.35mm
ERA-2AEB2152X	Panasonic	21.5 kΩ	±0.1%	0.063W	0402	±25ppm/°C	-55°C ~ 155°C	Active	Yes	0.40mm
MCS04020D2152BE100	Vishay	21.5 kΩ	±0.1%	0.063W	0402	±25ppm/°C	-55°C ~ 125°C	Active	No	0.37mm
RG1005N-2152-D-T10	Susumu	21.5 kΩ	±0.5%	0.063W	0402	±10ppm/°C	-55°C ~ 155°C	Active	Yes	0.40mm

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select RN73R1ETTP2152D25 from KOA Speer for the closest functional equivalent. This part maintains the same electrical characteristics as the obsolete RN731ETTP2152D25 while offering active product status and automotive AEC-Q200 qualification, providing enhanced reliability for new designs.

For General Industrial Applications: RT0402DRD0721K5L (YAGEO) or RR0510P-2152-D (Susumu) are suitable direct substitutes with active status. Both maintain ±0.5% tolerance and full operating temperature range compatibility. YAGEO offers higher inventory availability (8672 units).

For Automotive and High-Reliability Applications: Select from AEC-Q200 qualified options: RN73R1ETTP2152D25, AT0402DRD0721K5L, ERA-2AEB2152X, or RG1005N-2152-D-T10. These parts meet automotive qualification standards and provide enhanced reliability assurance.

For Precision Circuit Requirements: Upgrade to ±0.1% tolerance parts: AT0402BRD0721K5L, CPF0402B21K5E1, ERA-2AEB2152X, or MCS04020D2152BE100. These options provide tighter tolerance control while maintaining the 0402 package and 0.063W power rating.

For Temperature-Sensitive Applications: RG1005N-2152-D-T10 offers superior temperature coefficient (±10ppm/°C versus ±25ppm/°C), providing better stability across the full operating temperature range while maintaining AEC-Q200 qualification.

Compliance Considerations: All listed substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with modern manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with tighter tolerance than the original ±0.5%? A: Yes. Tighter tolerance specifications (±0.25%, ±0.1%) are fully compatible and provide improved circuit performance. The original design will function correctly with these upgrades.

Q: What is the difference between direct equivalents and upgrade options? A: Direct equivalents maintain identical ±0.5% tolerance and specifications. Upgrade options provide enhanced tolerance (±0.1% or ±0.25%), automotive AEC-Q200 qualification, anti-sulfur protection, or improved temperature coefficients while maintaining the same 21.5 kOhms resistance and 0402 package.

Q: Are all substitute parts available in the same 0402 package? A: Yes. All listed substitutes use the 0402 (1005 Metric) package form factor. Physical dimensions are equivalent, with minor height variations (0.35mm to 0.40mm maximum seated height) that do not affect PCB assembly compatibility.

Q: Which substitute offers the best temperature stability? A: RG1005N-2152-D-T10 provides the lowest temperature coefficient at ±10ppm/°C compared to ±25ppm/°C for other options, delivering superior stability across the -55°C to 155°C operating range.

Q: Do I need AEC-Q200 qualification for my application? A: AEC-Q200 qualification is required for automotive and high-reliability applications. For general industrial use, non-qualified parts are acceptable. Qualified options include RN73R1ETTP2152D25, AT0402BRD0721K5L, AT0402CRD0721K5L, AT0402DRD0721K5L, ERA-2AEB2152X, and RG1005N-2152-D-T10.

Q: What is the operating temperature range limitation for some substitutes? A: RR0510P-2152-D and MCS04020D2152BE100 operate to 125°C maximum, compared to 155°C for most other options. Verify your application's maximum operating temperature requirement before selection.

Q: Are all substitutes RoHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and are suitable for modern manufacturing environments requiring lead-free construction.

Q: What inventory levels are available for critical applications? A: RT0402DRD0721K5L (YAGEO) offers the highest inventory at 8672 units. ERA-2AEB2152X (Panasonic) provides 20,920 units for extended supply assurance. Other options range from 700 to 3,385 units.

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