RT0402FRE078K45L Equivalent & Substitute Parts

Part Overview

The RT0402FRE078K45L is an 8.45 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 with a temperature coefficient of ±50ppm/°C and operates across -55°C to 155°C. The part is ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating and is currently in active production status. Substitute parts are identified when equivalent resistance values, package dimensions, and power ratings are maintained while offering improved tolerance specifications or enhanced environmental certifications.

Key Parameters

Parameter	Value
Resistance	8.45 kOhms
Tolerance	±1%
Power Rating	0.063W (1/16W)
Package / Case	0402 (1005 Metric)
Composition	Thin Film
Temperature Coefficient	±50ppm/°C
Operating Temperature Range	-55°C ~ 155°C
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the RT0402FRE078K45L are qualified based on the following criteria:

Core Electrical Parameters (Non-Negotiable):

Resistance value: 8.45 kOhms
Power rating: 0.063W (1/16W) minimum
Package: 0402 (1005 Metric)
Composition: Thin Film

Allowable Variations:

Tolerance: Equal to or tighter than ±1% (±0.1% or ±0.5% acceptable)
Temperature coefficient: Equal to or better than ±50ppm/°C
Operating temperature range: Must encompass or match -55°C to 155°C minimum
Environmental certifications: ROHS3 compliance required; AEC-Q200 automotive rating is an enhancement, not a requirement

Substitute Categories:

Upgrade Tolerance (±0.1%): RT0402BRD078K45L, CPF0402B8K45E1, ERA-2AEB8451X, RG1005P-8451-B-T5 — These parts maintain identical electrical and mechanical specifications while providing tighter tolerance control and improved temperature coefficient performance (±25ppm/°C vs. ±50ppm/°C).

Equivalent Tolerance (±0.5%): RR0510P-8451-D — This part maintains the same resistance and package with relaxed tolerance but improved temperature coefficient (±25ppm/°C). Operating temperature range is -55°C to 125°C, which is acceptable for applications not requiring the full 155°C upper limit.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Op. Temp Range (°C)	Package	Features	RoHS Status
RT0402FRE078K45L	YAGEO	8.45 kΩ	±1%	0.063	±50	-55 ~ 155	0402	—	ROHS3
RT0402BRD078K45L	YAGEO	8.45 kΩ	±0.1%	0.063	±25	-55 ~ 155	0402	—	ROHS3
CPF0402B8K45E1	TE Connectivity	8.45 kΩ	±0.1%	0.063	±25	-55 ~ 155	0402	—	ROHS3
ERA-2AEB8451X	Panasonic	8.45 kΩ	±0.1%	0.063	±25	-55 ~ 155	0402	AEC-Q200	ROHS3
RG1005P-8451-B-T5	Susumu	8.45 kΩ	±0.1%	0.063	±25	-55 ~ 155	0402	Anti-Sulfur, AEC-Q200	ROHS3
RR0510P-8451-D	Susumu	8.45 kΩ	±0.5%	0.063	±25	-55 ~ 125	0402	—	ROHS3

Engineering Selection Recommendations

For Standard Industrial Applications: RT0402BRD078K45L (YAGEO) or CPF0402B8K45E1 (TE Connectivity) are direct upgrades from the original RT0402FRE078K45L, offering tighter tolerance (±0.1% vs. ±1%) and improved temperature stability (±25ppm/°C vs. ±50ppm/°C) while maintaining identical package and operating temperature range. Both parts are ROHS3 compliant and in active production with substantial inventory availability.

For Automotive Applications: ERA-2AEB8451X (Panasonic) or RG1005P-8451-B-T5 (Susumu) are qualified for automotive use under AEC-Q200 standard. RG1005P-8451-B-T5 includes anti-sulfur protection. Both maintain ±0.1% tolerance and ±25ppm/°C temperature coefficient across the full -55°C to 155°C operating range.

For Cost-Optimized Designs: RR0510P-8451-D (Susumu) provides equivalent resistance and package with relaxed tolerance (±0.5%) and improved temperature coefficient (±25ppm/°C). This part is suitable for applications where the upper operating temperature limit of 125°C is acceptable and tolerance of ±0.5% meets circuit requirements.

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and 0402 package compatibility with the original part.

Frequently Asked Questions (FAQ)

Q: Can RT0402BRD078K45L directly replace RT0402FRE078K45L in my circuit?

A: Yes. Both parts share identical resistance (8.45 kOhms), power rating (0.063W), package (0402), and operating temperature range (-55°C to 155°C). RT0402BRD078K45L offers improved tolerance (±0.1% vs. ±1%) and temperature coefficient (±25ppm/°C vs. ±50ppm/°C), making it a direct functional upgrade.

Q: What is the difference between ±1% and ±0.1% tolerance?

A: Tolerance specifies the maximum deviation of the actual resistance value from the nominal 8.45 kOhms specification. ±1% allows deviation up to ±84.5 ohms; ±0.1% restricts deviation to ±8.45 ohms. Tighter tolerance (±0.1%) is required for precision analog circuits, measurement instrumentation, and applications with strict gain or frequency accuracy requirements.

Q: Can I use RR0510P-8451-D if my circuit operates at 150°C?

A: No. RR0510P-8451-D is rated for -55°C to 125°C maximum operating temperature. For applications requiring operation at 150°C, use RT0402BRD078K45L, CPF0402B8K45E1, ERA-2AEB8451X, or RG1005P-8451-B-T5, all rated to 155°C.

Q: What does AEC-Q200 certification mean?

A: AEC-Q200 is an automotive industry standard qualification for passive components. ERA-2AEB8451X and RG1005P-8451-B-T5 meet this standard, indicating suitability for automotive applications with enhanced reliability testing and environmental stress screening. Non-automotive applications do not require this certification.

Q: Are all substitute parts available in Tape & Reel packaging?

A: RT0402BRD078K45L, CPF0402B8K45E1, RG1005P-8451-B-T5, and RR0510P-8451-D are supplied in Tape & Reel (TR) packaging. ERA-2AEB8451X is supplied in Cut Tape (CT) & Digi-Reel® packaging. Verify packaging format compatibility with your assembly process requirements.

Q: Which substitute part has the best temperature stability?

A: All upgrade substitutes (RT0402BRD078K45L, CPF0402B8K45E1, ERA-2AEB8451X, RG1005P-8451-B-T5) and RR0510P-8451-D share identical temperature coefficient of ±25ppm/°C, which is superior to the original part's ±50ppm/°C. Temperature coefficient determines resistance drift across the operating temperature range; lower values indicate better stability.

Q: Is the 0.016" maximum height of some substitutes compatible with my PCB assembly?

A: The original RT0402FRE078K45L specifies 0.014" (0.35mm) maximum seated height. ERA-2AEB8451X and RG1005P-8451-B-T5 specify 0.016" (0.40mm) maximum seated height. Verify your PCB design clearance and reflow profile compatibility. This minor height difference typically does not affect standard surface-mount assembly processes.

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