RT0402FRE079K31L Equivalent & Substitute Parts

Part Overview

The RT0402FRE079K31L is a 9.31 kOhms ±1% thin film chip resistor in 0402 (1005 Metric) package manufactured by YAGEO. This surface-mount device is rated for 0.063W (1/16W) power dissipation and operates across -55°C to 155°C. The part is ROHS3 compliant and carries MSL 1 (Unlimited) moisture sensitivity rating. As an active product with established supply availability, equivalent and substitute parts are identified for applications requiring alternative tolerance specifications, temperature coefficients, or automotive-grade certifications.

Key Parameters

Parameter	Value
Resistance	9.31 kOhms
Tolerance	±1%
Power Rating	0.063W (1/16W)
Package	0402 (1005 Metric)
Composition	Thin Film
Operating Temperature	-55°C to 155°C
Temperature Coefficient	±50ppm/°C
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the RT0402FRE079K31L is determined by three critical parameters: resistance value (9.31 kOhms), package type (0402/1005 Metric), and power rating (0.063W). All identified substitutes maintain these core specifications. Secondary parameters that differentiate substitutes include tolerance (±1%, ±0.5%, ±0.1%), temperature coefficient (±50ppm/°C, ±25ppm/°C), and special certifications (automotive AEC-Q200). Substitutes are grouped by tolerance grade, with tighter tolerances and lower temperature coefficients representing performance upgrades within the same electrical and mechanical envelope.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Operating Temp (°C)	Package	RoHS Status	Special Features
RT0402FRE079K31L	YAGEO	9.31 kOhms	±1%	0.063	±50	-55 to 155	0402	ROHS3	Standard
RT0402DRE079K31L	YAGEO	9.31 kOhms	±0.5%	0.063	±50	-55 to 155	0402	ROHS3	Tighter tolerance
RT0402BRD079K31L	YAGEO	9.31 kOhms	±0.1%	0.063	±25	-55 to 155	0402	ROHS3	Precision grade
CPF0402B9K31E1	TE Connectivity	9.31 kOhms	±0.1%	0.063	±25	-55 to 155	0402	ROHS3	Precision grade
ERA-2AEB9311X	Panasonic	9.31 kOhms	±0.1%	0.063	±25	-55 to 155	0402	ROHS3	AEC-Q200 Automotive

Engineering Selection Recommendations

Selection among substitute parts is based on application requirements and compliance certifications:

RT0402DRE079K31L provides intermediate tolerance (±0.5%) while maintaining the original temperature coefficient (±50ppm/°C). This part suits applications requiring improved accuracy over the standard ±1% specification without the cost premium of precision-grade components.

RT0402BRD079K31L and CPF0402B9K31E1 both deliver precision-grade performance with ±0.1% tolerance and ±25ppm/°C temperature coefficient. These parts are functionally equivalent and interchangeable, with selection based on supplier availability and procurement preference. Both maintain ROHS3 compliance and identical package dimensions.

ERA-2AEB9311X is specified for automotive applications requiring AEC-Q200 certification. This Panasonic part maintains identical electrical specifications (±0.1% tolerance, ±25ppm/°C) and package compatibility while meeting automotive-grade reliability standards. The seated height is 0.016" (0.40mm) versus 0.014" (0.35mm) for other variants; this minor dimensional difference remains within standard PCB assembly tolerances for 0402 packages.

All substitutes maintain ROHS3 compliance, MSL 1 rating, and -55°C to 155°C operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can RT0402DRE079K31L replace RT0402FRE079K31L in any application? A: Yes, within tolerance requirements. RT0402DRE079K31L provides ±0.5% tolerance versus the original ±1%, making it suitable for applications where the original tolerance is acceptable. Both parts share identical package, power rating, and operating temperature range.

Q: What is the difference between RT0402BRD079K31L and CPF0402B9K31E1? A: Both parts are electrically and mechanically equivalent with ±0.1% tolerance, ±25ppm/°C temperature coefficient, and 0402 package. The difference is manufacturer: YAGEO versus TE Connectivity. Selection depends on supply chain and procurement requirements.

Q: When should ERA-2AEB9311X be used instead of other substitutes? A: ERA-2AEB9311X is specified for automotive applications requiring AEC-Q200 certification. Use this part when automotive-grade reliability and qualification are mandatory. The seated height (0.40mm) is slightly higher than standard variants (0.35mm) but remains compatible with standard 0402 PCB assembly processes.

Q: Are all substitutes pin-compatible with the original RT0402FRE079K31L? A: Yes. All substitutes use identical 0402 (1005 Metric) package with 2 terminations and standard PCB footprint dimensions (0.039" L x 0.020" W / 1.00mm x 0.50mm).

Q: Can tolerance be mixed in a single circuit design? A: Tolerance selection depends on circuit function. Applications with tight accuracy requirements should use consistent tolerance grades (±0.1% precision parts). Mixed tolerance grades are acceptable in non-critical applications where the original ±1% specification is sufficient.

Q: What is the impact of temperature coefficient differences? A: RT0402FRE079K31L and RT0402DRE079K31L have ±50ppm/°C; RT0402BRD079K31L, CPF0402B9K31E1, and ERA-2AEB9311X have ±25ppm/°C. Lower temperature coefficient means better resistance stability across the -55°C to 155°C operating range. Select ±25ppm/°C parts for temperature-sensitive applications.

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