SRF2012A-261YA Equivalent & Substitute Parts

Part Overview

The SRF2012A-261YA is a 2-line common mode choke (CMC) manufactured by Bourns Inc., designed for signal line filtering in surface mount applications. This component provides 260 Ohms of impedance at 100 MHz with a maximum current rating of 300mA and is AEC-Q200 qualified for automotive applications. The part is currently active in production with 2300 pieces available in stock. Equivalent substitute parts are necessary when primary sourcing is unavailable, when managing supply chain redundancy, or when optimizing procurement across multiple qualified manufacturers.

Key Parameters

Parameter	Value
Manufacturer Part Number	SRF2012A-261YA
Manufacturer	Bourns Inc.
Filter Type	Signal Line
Number of Lines	2
Impedance @ Frequency	260 Ohms @ 100 MHz
Current Rating (Max)	300mA
DC Resistance (DCR) (Max)	400mOhm
Voltage Rating - DC	50V
Operating Temperature Range	-40°C ~ 125°C
Mounting Type	Surface Mount
Size / Dimension	0.079" L x 0.047" W (2.00mm x 1.20mm)
Height (Max)	0.055" (1.40mm)
Package / Case	Horizontal, 4 PC Pad
Ratings	AEC-Q200
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the SRF2012A-261YA are qualified based on strict electrical and mechanical parameter matching. The following parameters define substitution eligibility:

Critical Matching Parameters:

Number of Lines: 2
Impedance @ Frequency: 260 Ohms @ 100 MHz
Current Rating (Max): 300mA
DC Resistance (DCR) (Max): 400mOhm
Voltage Rating - DC: 50V
Operating Temperature Range: -40°C ~ 125°C
Mounting Type: Surface Mount
Size / Dimension: 0.079" L x 0.047" W (2.00mm x 1.20mm)
Height (Max): 0.055" (1.40mm)
Package / Case: Horizontal, 4 PC Pad
Ratings: AEC-Q200
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

All identified substitute parts meet these parameters identically, ensuring direct functional and mechanical compatibility in applications requiring the SRF2012A-261YA.

Parameter Comparison

Parameter	SRF2012A-261YA (Bourns)	744231261 (Würth Elektronik)	784231261 (Würth Elektronik)
Filter Type	Signal Line	Signal Line	Signal Line
Number of Lines	2	2	2
Impedance @ Frequency	260 Ohms @ 100 MHz	260 Ohms @ 100 MHz	260 Ohms @ 100 MHz
Current Rating (Max)	300mA	300mA	300mA
DC Resistance (DCR) (Max)	400mOhm	400mOhm	400mOhm
Voltage Rating - DC	50V	50V	50V
Operating Temperature Range	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Size / Dimension	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)	0.055" (1.40mm)	0.055" (1.40mm)	0.055" (1.40mm)
Package / Case	Horizontal, 4 PC Pad	Horizontal, 4 PC Pad	Horizontal, 4 PC Pad
Ratings	AEC-Q200	AEC-Q200	AEC-Q200
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active

Engineering Selection Recommendations

All three parts—SRF2012A-261YA (Bourns Inc.), 744231261 (Würth Elektronik WE-CNSW series), and 784231261 (Würth Elektronik WE-CNSA series)—are active products with identical electrical and mechanical specifications. Each part carries AEC-Q200 qualification, ROHS3 compliance, and MSL 1 rating, making them suitable for automotive and industrial applications requiring common mode filtering.

Selection between these parts should be based on availability, supply chain strategy, and procurement preferences. The Bourns part currently has 2300 pieces in stock, while the Würth Elektronik alternatives offer 12190 pieces (744231261) and 1426 pieces (784231261) respectively. All parts are suitable for direct substitution in applications designed for the SRF2012A-261YA.

Frequently Asked Questions (FAQ)

Q: Can 744231261 or 784231261 be used as direct replacements for SRF2012A-261YA?

A: Yes. Both Würth Elektronik parts meet all electrical and mechanical parameters of the Bourns part, including impedance, current rating, DC resistance, voltage rating, temperature range, package dimensions, and AEC-Q200 qualification. Direct substitution is supported without circuit modification.

Q: Are there differences between the two Würth Elektronik substitutes?

A: The 744231261 (WE-CNSW series) and 784231261 (WE-CNSA series) differ only in their internal series designation. All specified electrical and mechanical parameters are identical. Selection between them should be based on availability and supply chain considerations.

Q: What compliance certifications apply to all three parts?

A: All parts are AEC-Q200 qualified, ROHS3 compliant, and carry MSL 1 (Unlimited) moisture sensitivity rating. These certifications ensure suitability for automotive and high-reliability applications.

Q: Are the package dimensions identical across all three parts?

A: Yes. All three parts use the same surface mount package: 0.079" L x 0.047" W (2.00mm x 1.20mm) with a maximum height of 0.055" (1.40mm) and Horizontal, 4 PC Pad configuration. PCB layout and assembly processes require no modification when substituting between these parts.

Q: What is the operating temperature range for these common mode chokes?

A: All three parts operate across -40°C to 125°C, supporting both automotive and industrial temperature requirements.

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