ERJ-S08F3901V Equivalent & Substitute Parts

Part Overview

The ERJ-S08F3901V is a 3.9 kOhms ±1% 0.25W chip resistor in 1206 (3216 Metric) package manufactured by Panasonic Electronic Components. This thick film resistor features anti-sulfur coating and automotive AEC-Q200 qualification, designed for applications requiring high reliability in harsh environments. The part is currently active in production with 785 units in stock.

Substitute parts are necessary when the primary part becomes unavailable, when design requirements mandate alternative manufacturers for supply chain redundancy, or when specific feature enhancements such as increased power rating or pulse withstanding capability are required.

Key Parameters

Parameter	Value
Resistance	3.9 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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters:

Resistance value: 3.9 kOhms
Tolerance: ±1%
Package / Case: 1206 (3216 Metric)
Composition: Thick Film
Temperature Coefficient: ±100ppm/°C
Operating Temperature Range: -55°C ~ 155°C
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Parts are grouped into two categories:

Direct Equivalents (Identical Specifications): Parts meeting all parameters above with identical power rating (0.25W).

Enhanced Substitutes (Higher Power Rating): Parts meeting all core parameters but with increased power rating (0.75W), suitable for applications requiring additional thermal margin.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Features	Product Status	Inventory (Pcs)
ERJ-S08F3901V	Panasonic Electronic Components	3.9 kOhms	±1%	0.25W	1206	Anti-Sulfur, Automotive AEC-Q200	Active	785
ERJ-8ENF3901V	Panasonic Electronic Components	3.9 kOhms	±1%	0.25W	1206	Automotive AEC-Q200	Not For New Designs	55,977
CRG1206F3K9	TE Connectivity Passive Product	3.9 kOhms	±1%	0.25W	1206	—	Active	18,486
AC1206FR-073K9L	YAGEO	3.9 kOhms	±1%	0.25W	1206	Automotive AEC-Q200, Moisture Resistant	Active	18,463
CR1206-FX-3901ELF	Bourns Inc.	3.9 kOhms	±1%	0.25W	1206	Moisture Resistant	Active	35,491
CRCW12063K90FKEA	Vishay Dale	3.9 kOhms	±1%	0.25W	1206	Automotive AEC-Q200	Active	19,063
CRCW12063K90FKEAHP	Vishay Dale	3.9 kOhms	±1%	0.75W	1206	Automotive AEC-Q200, Pulse Withstanding	Active	10,064
RC1206FR-073K9L	YAGEO	3.9 kOhms	±1%	0.25W	1206	Moisture Resistant	Active	20,104
RMCF1206FT3K90	Stackpole Electronics Inc	3.9 kOhms	±1%	0.25W	1206	Automotive AEC-Q200	Active	46,207

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

CRG1206F3K9 (TE Connectivity), AC1206FR-073K9L (YAGEO), CRCW12063K90FKEA (Vishay Dale), RC1206FR-073K9L (YAGEO), and RMCF1206FT3K90 (Stackpole Electronics) are all active production parts meeting the full specification of ERJ-S08F3901V. All are ROHS3 compliant with MSL 1 rating. Selection among these should be based on supply chain availability and established qualification status within your organization.

For Enhanced Thermal Performance:

CRCW12063K90FKEAHP (Vishay Dale) provides identical electrical specifications with increased power rating (0.75W vs. 0.25W) and pulse withstanding capability. This part is suitable for applications requiring additional thermal margin or exposure to transient overvoltage conditions, while maintaining the same 1206 package footprint and AEC-Q200 automotive qualification.

Avoid for New Designs:

ERJ-8ENF3901V (Panasonic) is marked "Not For New Designs" and should not be selected for new product development, despite high inventory availability.

Frequently Asked Questions (FAQ)

Q: Can ERJ-8ENF3901V be used as a substitute despite "Not For New Designs" status?

A: ERJ-8ENF3901V meets all electrical and mechanical parameters for substitution. However, the "Not For New Designs" designation indicates Panasonic's intent to phase out this part. Use only in legacy product support or when existing qualification documentation explicitly permits this part number.

Q: What is the difference between 0.25W and 0.75W rated parts in the same package?

A: Power rating indicates maximum continuous power dissipation capability. The 0.75W variant (CRCW12063K90FKEAHP) can safely dissipate three times more power than the 0.25W variant while maintaining the same physical dimensions. Both are electrically equivalent for resistance and tolerance. Selection depends on circuit power dissipation requirements.

Q: Are all substitute parts automotive qualified?

A: Not all. CRG1206F3K9 (TE Connectivity) and CR1206-FX-3901ELF (Bourns) do not carry AEC-Q200 qualification. AC1206FR-073K9L, CRCW12063K90FKEA, CRCW12063K90FKEAHP, and RMCF1206FT3K90 are AEC-Q200 qualified. ERJ-S08F3901V and ERJ-8ENF3901V are also AEC-Q200 qualified. Verify automotive qualification requirements for your application before selection.

Q: Do dimensional variations between parts affect PCB layout?

A: All parts use the 1206 (3216 Metric) package. Dimensional variations exist within tolerance (length 0.122" to 0.126", height 0.024" to 0.030"), but these fall within standard 1206 footprint specifications. PCB layouts designed for 1206 package will accommodate all listed substitutes without modification.

Q: What is the significance of "Anti-Sulfur" and "Moisture Resistant" features?

A: Anti-Sulfur coating (ERJ-S08F3901V) protects against sulfur-containing atmospheric corrosion. Moisture Resistant feature (AC1206FR-073K9L, CR1206-FX-3901ELF, RC1206FR-073K9L) enhances performance in high-humidity environments. Both features improve long-term reliability but are not required for basic electrical equivalence. Select based on environmental exposure conditions.

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