SRF1260-331M Equivalent & Substitute Parts

Part Overview

The SRF1260-331M is a shielded 2-coil inductor array manufactured by Bourns Inc., designed for surface mount applications. This component features dual inductance configurations: 330 µH when coils are connected in parallel and 1.32 mH when connected in series. The part is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when equivalent electrical and mechanical parameters are required for design flexibility, inventory management, or supply chain continuity.

Key Parameters

Parameter	Value
Number of Coils	2
Inductance - Parallel Configuration	330 µH
Inductance - Series Configuration	1.32 mH
Tolerance	±20%
Current Rating - Parallel	1.06 A
Current Rating - Series	530 mA
DC Resistance (DCR) - Parallel	574 mOhm Max
DC Resistance (DCR) - Series	2.29 Ohm Max
Shielding	Shielded
Operating Temperature Range	-40°C to 125°C
Mounting Type	Surface Mount
Package Dimensions	12.50 mm L × 12.50 mm W × 6.20 mm H
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SRF1260-331M are qualified based on the following critical parameters:

Coil Configuration: Dual-coil inductor array with parallel and series connection options
Inductance Values: Parallel inductance within the range of 330–340 µH; series inductance within the range of 1.3–1.32 mH
Tolerance: ±20% inductance tolerance
Current Ratings: Parallel current rating minimum 1.06 A; series current rating minimum 530 mA
DC Resistance: Parallel DCR maximum 574 mOhm; series DCR maximum 2.29 Ohm
Shielding: Shielded construction required
Temperature Range: Operating range of -40°C to 125°C
Mounting: Surface mount, nonstandard package
Footprint: 12.50 mm × 12.50 mm base dimensions
Compliance: RoHS3 compliant, MSL 1 rating

The PF0552.334NL from Pulse Electronics meets these substitution criteria with inductance values of 340 µH (parallel) and 1.3 mH (series), current ratings of 1.2 A (parallel) and 610 mA (series), and equivalent shielding, temperature range, and compliance certifications.

Parameter Comparison

Parameter	SRF1260-331M (Bourns)	PF0552.334NL (Pulse Electronics)
Number of Coils	2	2
Inductance - Parallel	330 µH	340 µH
Inductance - Series	1.32 mH	1.3 mH
Tolerance	±20%	±20%
Current Rating - Parallel	1.06 A	1.2 A
Current Rating - Series	530 mA	610 mA
Current Saturation - Parallel	1.22 A	1.2 A
Current Saturation - Series	610 mA	620 mA
DC Resistance (DCR) - Parallel	574 mOhm Max	470 mOhm Max
DC Resistance (DCR) - Series	2.29 Ohm Max	1.9 Ohm Max
Shielding	Shielded	Shielded
Operating Temperature	-40°C to 125°C	-40°C to 125°C
Mounting Type	Surface Mount	Surface Mount
Package Dimensions	12.50 mm × 12.50 mm × 6.20 mm	12.50 mm × 12.50 mm × 6.00 mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active

Engineering Selection Recommendations

Both the SRF1260-331M and PF0552.334NL are active production components with ROHS3 compliance and MSL 1 ratings, making them suitable for equivalent substitution in applications requiring shielded dual-coil inductor arrays. The PF0552.334NL offers improved electrical performance with lower DC resistance in both parallel (470 mOhm vs. 574 mOhm) and series (1.9 Ohm vs. 2.29 Ohm) configurations, along with higher current ratings. Both parts maintain identical operating temperature ranges and footprint dimensions, with only a 0.2 mm difference in height (6.00 mm vs. 6.20 mm). Selection between these parts should be based on availability, cost considerations, and specific application requirements for current handling and resistance characteristics.

Frequently Asked Questions (FAQ)

Q: What defines a valid substitute for the SRF1260-331M? A: A valid substitute must be a dual-coil shielded inductor array with parallel inductance between 330–340 µH, series inductance between 1.3–1.32 mH, ±20% tolerance, minimum current ratings of 1.06 A (parallel) and 530 mA (series), surface mount configuration, 12.50 mm × 12.50 mm footprint, operating temperature range of -40°C to 125°C, and ROHS3 compliance.

Q: Are the inductance values of the PF0552.334NL within acceptable substitution range? A: Yes. The PF0552.334NL parallel inductance of 340 µH and series inductance of 1.3 mH fall within the ±20% tolerance band of the SRF1260-331M specifications (330 µH parallel, 1.32 mH series).

Q: What is the impact of the 0.2 mm height difference between these parts? A: The PF0552.334NL height of 6.00 mm compared to the SRF1260-331M height of 6.20 mm represents a 0.2 mm reduction. This difference must be evaluated against specific PCB clearance and assembly requirements for the target application.

Q: How do the DC resistance values compare? A: The PF0552.334NL exhibits lower DC resistance in both configurations: 470 mOhm (parallel) versus 574 mOhm for the SRF1260-331M, and 1.9 Ohm (series) versus 2.29 Ohm. Lower resistance reduces power dissipation and heat generation.

Q: Are both parts suitable for the same temperature operating range? A: Yes. Both the SRF1260-331M and PF0552.334NL operate across the identical temperature range of -40°C to 125°C.

Q: What are the current rating differences? A: The PF0552.334NL provides higher current ratings: 1.2 A (parallel) versus 1.06 A, and 610 mA (series) versus 530 mA for the SRF1260-331M, offering greater current handling capacity.

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