MCR18ERTF3921 Equivalent & Substitute Parts

Part Overview

The MCR18ERTF3921 is a 3.92 kOhms ±1% 0.25W thick film chip resistor in 1206 (3216 Metric) package manufactured by Rohm Semiconductor. This part is discontinued at DiGi Electronics, necessitating identification of equivalent substitute components that maintain identical electrical and mechanical specifications. Substitute parts must match the resistance value, tolerance, power rating, package dimensions, and operating temperature range to ensure direct compatibility in existing designs.

Key Parameters

Parameter	Specification
Resistance Value	3.92 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 to 155°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)
Number of Terminations	2

Substitute Part Grouping Explanation

Substitute parts for the MCR18ERTF3921 are qualified based on strict equivalence of the following parameters:

Resistance value: 3.92 kOhms
Tolerance: ±1%
Power rating: 0.25W (1/4W)
Package: 1206 (3216 Metric)
Composition: Thick Film
Temperature coefficient: ±100ppm/°C
Operating temperature range: -55°C to 155°C
RoHS3 compliance
MSL rating: 1 (Unlimited)

All identified substitute parts meet these core electrical and mechanical requirements. Variations in physical dimensions (length, width, height) within the 1206 package specification and differences in product status or special features (moisture resistance, automotive qualification) do not affect functional substitutability for standard applications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Op. Temp Range	Product Status	RoHS3	MSL
MCR18ERTF3921	Rohm Semiconductor	3.92 kΩ	±1%	0.25	1206	±100ppm/°C	-55 to 155°C	Discontinued	Yes	1
CR1206-FX-3921ELF	Bourns Inc.	3.92 kΩ	±1%	0.25	1206	±100ppm/°C	-55 to 155°C	Active	Yes	1
CRCW12063K92FKEA	Vishay Dale	3.92 kΩ	±1%	0.25	1206	±100ppm/°C	-55 to 155°C	Active	Yes	1
ERJ-8ENF3921V	Panasonic Electronic Components	3.92 kΩ	±1%	0.25	1206	±100ppm/°C	-55 to 155°C	Not For New Designs	Yes	1
RC1206FR-073K92L	YAGEO	3.92 kΩ	±1%	0.25	1206	±100ppm/°C	-55 to 155°C	Active	Yes	1
RMCF1206FG3K92	Stackpole Electronics Inc	3.92 kΩ	±1%	0.25	1206	±100ppm/°C	-55 to 155°C	Active	Yes	1
RMCF1206FT3K92	Stackpole Electronics Inc	3.92 kΩ	±1%	0.25	1206	±100ppm/°C	-55 to 155°C	Active	Yes	1

Engineering Selection Recommendations

For new designs and ongoing production, prioritize parts with Active product status:

CR1206-FX-3921ELF (Bourns Inc.) — Active status with moisture-resistant thick film composition
CRCW12063K92FKEA (Vishay Dale) — Active status with automotive AEC-Q200 qualification
RC1206FR-073K92L (YAGEO) — Active status with moisture-resistant thick film composition
RMCF1206FG3K92 (Stackpole Electronics Inc) — Active status with automotive AEC-Q200 qualification
RMCF1206FT3K92 (Stackpole Electronics Inc) — Active status with automotive AEC-Q200 qualification

ERJ-8ENF3921V (Panasonic Electronic Components) carries "Not For New Designs" status and should be used only for legacy system maintenance or repair applications where continuity with existing inventory is required.

All substitute parts maintain ROHS3 compliance and MSL rating 1 (Unlimited), ensuring compatibility with standard PCB assembly processes and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can MCR18ERTF3921 be directly replaced with any of the listed substitutes?

A: Yes. All listed substitute parts are electrically and mechanically equivalent. They share identical resistance value (3.92 kOhms), tolerance (±1%), power rating (0.25W), package (1206), temperature coefficient (±100ppm/°C), and operating temperature range (-55°C to 155°C). Direct PCB footprint compatibility is maintained.

Q: What is the difference between parts with and without automotive AEC-Q200 qualification?

A: AEC-Q200 qualification indicates the part meets automotive industry reliability and quality standards. Parts with this qualification (CRCW12063K92FKEA, ERJ-8ENF3921V, RMCF1206FG3K92, RMCF1206FT3K92) are suitable for automotive applications. Parts without this designation (CR1206-FX-3921ELF, RC1206FR-073K92L) are suitable for general industrial and consumer applications.

Q: Does "moisture resistant" affect substitutability?

A: No. Moisture-resistant thick film composition (CR1206-FX-3921ELF, RC1206FR-073K92L) provides enhanced environmental protection but does not change electrical performance or package compatibility. All parts maintain MSL rating 1 (Unlimited).

Q: Why is ERJ-8ENF3921V marked "Not For New Designs"?

A: This designation indicates the manufacturer is phasing out this part number. It remains available for existing inventory and legacy system support but should not be selected for new product development. Use Active-status alternatives for new designs.

Q: Are there packaging differences between substitute parts?

A: Packaging format differs (Cut Tape vs. Tape & Reel), but this affects supply chain logistics only, not component functionality or PCB assembly compatibility. Physical dimensions vary slightly within 1206 package tolerance but do not impact board layout or thermal performance.

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