RN731ETTP8661F25 Equivalent & Substitute Parts

Part Overview

The RN731ETTP8661F25 is an 8.66 kOhms ±1% 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 part 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	8.66 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

Substitution for RN731ETTP8661F25 is determined by strict equivalence in the following parameters:

Resistance value: 8.66 kOhms (exact match required)
Tolerance: ±1% or tighter (±0.1%, ±0.25%, ±0.5% are acceptable upgrades)
Power rating: 0.063W (1/16W) minimum
Package: 0402 (1005 Metric) form factor
Composition: Thin film construction
Temperature coefficient: ±25ppm/°C
Operating temperature range: -55°C ~ 155°C minimum
Moisture sensitivity: MSL 1 or equivalent
RoHS compliance: ROHS3 Compliant

Substitute parts are categorized as direct equivalents (matching tolerance) or upgrades (tighter tolerance with enhanced features such as automotive AEC-Q200 qualification or anti-sulfur construction).

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Composition	Temp Coeff (ppm/°C)	Op. Temp (°C)	Features	Status
RN731ETTP8661F25	KOA Speer	8.66k	±1%	0.063	0402	Thin Film	±25	-55~155	Moisture Resistant	Obsolete
RN73R1ETTP8661F25	KOA Speer	8.66k	±1%	0.063	0402	Thin Film	±25	-55~155	Automotive AEC-Q200, Moisture Resistant	Active
RT0402FRD078K66L	YAGEO	8.66k	±1%	0.063	0402	Thin Film	±25	-55~155	—	Active
AT0402BRD078K66L	YAGEO	8.66k	±0.1%	0.063	0402	Thin Film	±25	-55~155	Anti-Sulfur, Automotive AEC-Q200, Moisture Resistant	Active
AT0402CRD078K66L	YAGEO	8.66k	±0.25%	0.063	0402	Thin Film	±25	-55~155	Anti-Sulfur, Automotive AEC-Q200, Moisture Resistant	Active
AT0402DRD078K66L	YAGEO	8.66k	±0.5%	0.063	0402	Thin Film	±25	-55~155	Anti-Sulfur, Automotive AEC-Q200, Moisture Resistant	Active
CPF0402B8K66E1	TE Connectivity	8.66k	±0.1%	0.063	0402	Thin Film	±25	-55~155	—	Active
ERA-2AEB8661X	Panasonic	8.66k	±0.1%	0.063	0402	Thin Film	±25	-55~155	Automotive AEC-Q200	Active
MCS04020D8661BE100	Vishay Beyschlag	8.66k	±0.1%	0.063	0402	Thin Film	±25	-55~125	Anti-Sulfur	Active
RG1005P-8661-B-T5	Susumu	8.66k	±0.1%	0.063	0402	Thin Film	±25	-55~155	Anti-Sulfur, Automotive AEC-Q200	Active
RG1005P-8661-D-T10	Susumu	8.66k	±0.5%	0.063	0402	Thin Film	±25	-55~155	Anti-Sulfur, Automotive AEC-Q200	Active

Engineering Selection Recommendations

Direct Equivalent (Active Status): RN73R1ETTP8661F25 from KOA Speer Electronics is the direct active equivalent, maintaining ±1% tolerance and identical electrical specifications while adding automotive AEC-Q200 qualification. This part provides the most straightforward replacement path.

RT0402FRD078K66L from YAGEO is a functional equivalent with ±1% tolerance and active product status, suitable for non-automotive applications requiring standard thin film performance.

Upgrade Options (Tighter Tolerance, Enhanced Features): Parts with ±0.1% tolerance (AT0402BRD078K66L, CPF0402B8K66E1, ERA-2AEB8661X, RG1005P-8661-B-T5) provide improved accuracy and are recommended for precision analog circuits. AT0402BRD078K66L, ERA-2AEB8661X, and RG1005P-8661-B-T5 include automotive AEC-Q200 qualification for automotive applications.

Parts with ±0.25% tolerance (AT0402CRD078K66L) and ±0.5% tolerance (AT0402DRD078K66L, RG1005P-8661-D-T10) offer intermediate accuracy improvements with automotive qualification.

Temperature Range Consideration: MCS04020D8661BE100 operates to -55°C ~ 125°C, which is narrower than the original -55°C ~ 155°C specification. This part is suitable only for applications not requiring the full upper temperature range.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with tighter tolerance than ±1%? A: Yes. Parts with ±0.1%, ±0.25%, or ±0.5% tolerance are direct upgrades and will function in any circuit designed for ±1% tolerance. Tighter tolerance improves circuit accuracy and stability.

Q: What does AEC-Q200 qualification mean? A: AEC-Q200 is an automotive industry standard qualification indicating the part meets reliability and performance requirements for automotive applications, including thermal cycling and environmental stress testing. Parts with this rating are suitable for both automotive and general industrial use.

Q: Are all substitute parts in the same 0402 package? A: Yes. All listed substitutes use the 0402 (1005 Metric) package with identical footprint dimensions (0.039" L x 0.020" W / 1.00mm x 0.50mm), ensuring direct PCB compatibility.

Q: What is the difference between moisture resistant and anti-sulfur features? A: Moisture resistant construction protects against humidity ingress. Anti-sulfur construction provides additional protection against sulfur-containing atmospheric contaminants, extending reliability in harsh industrial environments. Both features are compatible with standard assembly processes.

Q: Is RoHS3 compliance maintained across all substitutes? A: Yes. All listed substitute parts maintain ROHS3 compliance, ensuring compatibility with environmental regulations and customer requirements.

Q: Which substitute should I choose for a new design? A: For new designs, select from active status parts. RN73R1ETTP8661F25 provides direct equivalence. For automotive applications, choose parts with AEC-Q200 qualification. For precision requirements, select ±0.1% tolerance variants.

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