ACM-31-121M-T Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ACM-31-121M-T is a 2-line common mode choke manufactured by Abracon LLC, designed for signal line filtering applications. This surface mount component operates at 120 Ohms impedance at 100 MHz with a maximum current rating of 370mA and DC resistance of 300mOhm. The part is active in production status with ROHS3 compliance and unlimited moisture sensitivity level rating. Equivalent substitute parts are identified based on matching electrical specifications and mechanical compatibility within the surface mount package category.

Key Parameters

Parameter	Value
Manufacturer Part Number	ACM-31-121M-T
Manufacturer	Abracon LLC
Filter Type	Signal Line
Number of Lines	2
Impedance @ Frequency	120 Ohms @ 100 MHz
Current Rating (Max)	370mA
DC Resistance (DCR) (Max)	300mOhm
Voltage Rating - DC	50V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	Horizontal, 4 PC Pad
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the ACM-31-121M-T are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Number of Lines: 2
Impedance @ Frequency: 120 Ohms @ 100 MHz
Current Rating (Max): 370mA
DC Resistance (DCR) (Max): 300mOhm
Voltage Rating - DC: 50V
Operating Temperature: -40°C ~ 85°C
Mounting Type: Surface Mount
Package / Case: Horizontal, 4 PC Pad
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

All identified substitute parts meet these electrical specifications and mechanical requirements. Dimensional variations exist within acceptable tolerances for surface mount assembly compatibility.

Parameter Comparison

Parameter	ACM-31-121M-T	ACM-21-121M-T	DLW21SN121SQ2L	ICM0805ER121M
Manufacturer	Abracon LLC	Abracon LLC	Murata Electronics	Vishay Dale
Number of Lines	2	2	2	2
Impedance @ Frequency	120 Ohms @ 100 MHz	120 Ohms @ 100 MHz	120 Ohms @ 100 MHz	120 Ohms @ 100 MHz
Current Rating (Max)	370mA	370mA	370mA	370mA
DC Resistance (DCR) (Max)	300mOhm	300mOhm	300mOhm	300mOhm
Voltage Rating - DC	50V	50V	50V	50V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Size / Dimension	0.118" L x 0.063" W (3.00mm x 1.60mm)	0.079" L x 0.047" W (2.00mm x 1.20mm)	0.079" L x 0.047" W (2.00mm x 1.20mm)	0.079" L x 0.047" W (2.00mm x 1.20mm)
Height (Max)	0.079" (2.00mm)	0.055" (1.40mm)	0.055" (1.40mm)	0.057" (1.45mm)
Package / Case	Horizontal, 4 PC Pad	Horizontal, 4 PC Pad	Horizontal, 4 PC Pad	Horizontal, 4 PC Pad
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active
Packaging	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)

Engineering Selection Recommendations

All substitute parts listed maintain active product status with ROHS3 compliance and MSL 1 rating, ensuring regulatory and environmental compatibility with the ACM-31-121M-T. Selection between substitute options depends on dimensional constraints and packaging availability requirements.

The ACM-21-121M-T and DLW21SN121SQ2L offer reduced footprint dimensions (2.00mm x 1.20mm) compared to the primary part (3.00mm x 1.60mm), suitable for space-constrained applications. The ICM0805ER121M from Vishay Dale provides equivalent electrical performance with comparable compact dimensions.

Packaging format availability varies: ACM-21-121M-T and ICM0805ER121M are supplied in Tape & Reel format, while DLW21SN121SQ2L is available in Cut Tape and Digi-Reel formats. Inventory levels differ across manufacturers, with DLW21SN121SQ2L showing highest stock availability at 25,400 pieces.

Frequently Asked Questions (FAQ)

Q: Can ACM-21-121M-T replace ACM-31-121M-T in existing designs?

A: ACM-21-121M-T is electrically equivalent with identical impedance, current rating, and DC resistance specifications. The primary difference is physical size: ACM-21-121M-T measures 2.00mm x 1.20mm versus 3.00mm x 1.60mm for ACM-31-121M-T. PCB layout compatibility must be confirmed before substitution.

Q: What are the dimensional constraints for substitute selection?

A: The ACM-31-121M-T has the largest footprint at 3.00mm x 1.60mm with 2.00mm height. Substitute parts ACM-21-121M-T, DLW21SN121SQ2L, and ICM0805ER121M all use 2.00mm x 1.20mm footprints with heights ranging from 1.40mm to 1.45mm. Designs requiring the original larger footprint cannot use these substitutes without PCB modification.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. ACM-21-121M-T, DLW21SN121SQ2L, and ICM0805ER121M are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the primary part's environmental specifications.

Q: What is the difference between packaging formats?

A: ACM-31-121M-T, ACM-21-121M-T, and ICM0805ER121M are supplied in Tape & Reel (TR) format. DLW21SN121SQ2L is available in Cut Tape (CT) and Digi-Reel formats. Packaging selection depends on assembly equipment compatibility and order quantity requirements.

Q: Do all parts operate within the same temperature range?

A: Yes. All parts including ACM-31-121M-T and its substitutes operate across -40°C to 85°C, ensuring thermal compatibility across standard industrial and commercial applications.

Q: Which substitute offers the best inventory availability?

A: DLW21SN121SQ2L from Murata Electronics has the highest stock level at 25,400 pieces. ACM-21-121M-T has 728 pieces available, and ICM0805ER121M has 2,200 pieces. Availability should be confirmed with suppliers for current stock status.

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