ERJ-S08F4221V Equivalent & Substitute Parts

Part Overview

The ERJ-S08F4221V is a 4.22 kOhms ±1% 0.25W thick film chip resistor in 1206 (3216 Metric) package manufactured by Panasonic Electronic Components. This part features anti-sulfur coating and automotive AEC-Q200 qualification, designed for applications requiring high reliability in harsh environments. The product is currently active with 809 units in stock.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when design requirements shift toward different manufacturers, or when supply chain optimization requires component standardization across multiple qualified alternatives that meet identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Resistance	4.22 kOhms
Tolerance	±1%
Power Rating	0.25W (1/4W)
Package / Case	1206 (3216 Metric)
Composition	Thick Film
Temperature Coefficient	±100ppm/°C
Operating Temperature Range	-55°C ~ 155°C
Number of Terminations	2
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the ERJ-S08F4221V is determined by strict equivalence across the following parameters:

Resistance value: 4.22 kOhms (exact match required)
Tolerance: ±1% (exact match required)
Power rating: 0.25W / 1/4W (exact match required)
Package: 1206 (3216 Metric) (exact match required)
Composition: Thick Film (exact match required)
Temperature coefficient: ±100ppm/°C (exact match required)
Operating temperature range: -55°C ~ 155°C (exact match required)
Termination count: 2 (exact match required)
RoHS compliance: ROHS3 Compliant (exact match required)
Moisture sensitivity: MSL 1 (exact match required)

All six substitute parts listed below meet these criteria and are therefore electrically and mechanically interchangeable with the ERJ-S08F4221V in applications where the specific feature set (anti-sulfur coating, automotive qualification) of the primary part is not contractually mandated.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Op. Temp Range	Product Status	AEC-Q200	Inventory (Pcs)
ERJ-S08F4221V	Panasonic	4.22 kΩ	±1%	0.25	1206	±100ppm/°C	-55 ~ 155°C	Active	Yes	809
ERJ-8ENF4221V	Panasonic	4.22 kΩ	±1%	0.25	1206	±100ppm/°C	-55 ~ 155°C	Not For New Designs	Yes	108633
AC1206FR-074K22L	YAGEO	4.22 kΩ	±1%	0.25	1206	±100ppm/°C	-55 ~ 155°C	Active	Yes	9549
CR1206-FX-4221ELF	Bourns Inc.	4.22 kΩ	±1%	0.25	1206	±100ppm/°C	-55 ~ 155°C	Active	No	14591
CRCW12064K22FKEA	Vishay Dale	4.22 kΩ	±1%	0.25	1206	±100ppm/°C	-55 ~ 155°C	Active	Yes	19832
RC1206FR-074K22L	YAGEO	4.22 kΩ	±1%	0.25	1206	±100ppm/°C	-55 ~ 155°C	Active	No	34673
RMCF1206FT4K22	Stackpole Electronics Inc	4.22 kΩ	±1%	0.25	1206	±100ppm/°C	-55 ~ 155°C	Active	Yes	164224

Engineering Selection Recommendations

For Active Production Designs: CRCW12064K22FKEA (Vishay Dale), AC1206FR-074K22L (YAGEO), and RMCF1206FT4K22 (Stackpole Electronics Inc) are recommended. All three maintain Active product status, ROHS3 compliance, and AEC-Q200 automotive qualification. RMCF1206FT4K22 offers the highest inventory availability at 164,224 units.

For Automotive Applications Requiring AEC-Q200: CRCW12064K22FKEA, AC1206FR-074K22L, and RMCF1206FT4K22 all carry AEC-Q200 certification. ERJ-8ENF4221V (Panasonic) also qualifies but carries "Not For New Designs" status and should be used only for legacy design maintenance or existing production continuity.

For Non-Automotive Applications: CR1206-FX-4221ELF (Bourns Inc.) and RC1206FR-074K22L (YAGEO) are suitable alternatives when AEC-Q200 qualification is not required. Both are Active products with ROHS3 compliance.

Supply Chain Considerations: RMCF1206FT4K22 provides the largest inventory buffer. AC1206FR-074K22L and RC1206FR-074K22L offer YAGEO sourcing diversity. CRCW12064K22FKEA provides Vishay Dale qualification.

Frequently Asked Questions (FAQ)

Q: Can ERJ-8ENF4221V replace ERJ-S08F4221V in new designs? A: ERJ-8ENF4221V carries "Not For New Designs" status. It is electrically and mechanically equivalent but should be reserved for legacy production support only. Use CRCW12064K22FKEA, AC1206FR-074K22L, or RMCF1206FT4K22 for new designs.

Q: What is the difference between parts with and without AEC-Q200 certification? A: AEC-Q200 certification indicates automotive-grade qualification with enhanced reliability testing. CR1206-FX-4221ELF and RC1206FR-074K22L lack this certification and are suitable for non-automotive applications. All other substitutes carry AEC-Q200 qualification.

Q: Are there physical dimension differences between substitutes? A: All parts use the 1206 (3216 Metric) package. Minor variations exist in maximum seated height (0.024" to 0.030"), but these fall within standard PCB assembly tolerances and do not affect interchangeability in standard applications.

Q: Which substitute offers the best supply availability? A: RMCF1206FT4K22 (Stackpole Electronics Inc) provides 164,224 units in inventory, significantly exceeding other alternatives.

Q: Can I use CR1206-FX-4221ELF or RC1206FR-074K22L in automotive applications? A: These parts lack AEC-Q200 certification. Use them only in non-automotive applications or where automotive qualification is not contractually required. For automotive use, select from CRCW12064K22FKEA, AC1206FR-074K22L, RMCF1206FT4K22, or ERJ-8ENF4221V.

Q: Are all substitutes ROHS3 compliant? A: Yes. All listed substitutes and the primary part are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

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