B1135AS-680M=P3 Equivalent & Substitute Parts

Part Overview

The B1135AS-680M=P3 is a 68 µH shielded drum core wirewound inductor manufactured by Murata Electronics, rated for 1.3 A continuous current with a maximum DC resistance of 235 mOhm. This component is classified as obsolete, making identification of suitable substitutes essential for ongoing design support and production continuity. The part operates across the temperature range of -40°C to 85°C and is designed for surface mount applications in nonstandard packaging.

Substiute Parts

B1135AS-680M=P3

Murata ElectronicsIn Stock: 799B1135AS-680M=P3 Datasheet

Current PartRFQ

SRR1260-680M

Bourns Inc.In Stock: 2576SRR1260-680M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the B1135AS-680M=P3 is determined by the following critical parameters:

• Inductance Value: Must match 68 µH at the specified test frequency of 100 kHz
• Inductance Tolerance: ±20% tolerance band must be maintained
• Core Type and Shielding: Ferrite core with shielding characteristics must be preserved
• Current Rating: Substitute must support minimum 1.3 A continuous current
• DC Resistance: Lower DCR values are acceptable; higher values may impact circuit performance
• Mounting Configuration: Surface mount technology with compatible footprint dimensions
• Temperature Range: Operating temperature capability must cover the required -40°C to 85°C minimum

The SRR1260-680M from Bourns Inc. meets these substitution criteria with enhanced electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The SRR1260-680M is the qualified substitute for the obsolete B1135AS-680M=P3. Selection is based on the following engineering factors:

Product Status: The B1135AS-680M=P3 is classified as obsolete, while the SRR1260-680M maintains active production status, ensuring long-term availability and supply chain continuity.

Electrical Compatibility: Both inductors maintain identical inductance values of 68 µH at 100 kHz with ±20% tolerance. The SRR1260-680M provides superior current handling capability (2.1 A versus 1.3 A) and significantly lower DC resistance (110 mOhm versus 235 mOhm), delivering improved thermal performance and reduced power dissipation in the application circuit.

Compliance and Certifications: The SRR1260-680M is ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements. Both components maintain MSL 1 moisture sensitivity classification.

Temperature Performance: The SRR1260-680M extends the operating temperature range to -40°C to 125°C, providing additional thermal margin beyond the original specification of -40°C to 85°C.

Physical Considerations: The SRR1260-680M features larger physical dimensions (12.50mm x 12.50mm x 6.50mm) compared to the B1135AS-680M=P3 (8.40mm x 8.30mm x 5.00mm). PCB layout modifications may be required to accommodate the increased footprint.

Frequently Asked Questions (FAQ)

Q: Can the SRR1260-680M directly replace the B1135AS-680M=P3 without circuit modifications?

A: Electrical substitution is valid based on matching inductance values, tolerance, core material, and shielding characteristics. However, the larger physical dimensions of the SRR1260-680M require PCB layout evaluation to confirm mechanical fit within the available space.

Q: What are the key differences between these two inductors?

A: The primary differences are product status (obsolete versus active), current rating (1.3 A versus 2.1 A), DC resistance (235 mOhm versus 110 mOhm), operating temperature range (-40°C to 85°C versus -40°C to 125°C), and physical package size. The SRR1260-680M offers superior electrical performance with lower losses and higher current capacity.

Q: Are there any compliance or certification differences?

A: The SRR1260-680M is ROHS3 compliant and REACH unaffected, providing compliance with current environmental regulations. Both components maintain MSL 1 moisture sensitivity classification and are suitable for standard surface mount assembly processes.

Q: What is the impact of lower DC resistance in the SRR1260-680M?

A: Lower DC resistance (110 mOhm versus 235 mOhm) reduces resistive losses and heat generation during operation. This improvement enhances efficiency and thermal performance, particularly in applications operating at or near the 1.3 A current rating of the original component.

Q: How does the extended temperature range of the SRR1260-680M affect system design?

A: The SRR1260-680M operates to 125°C versus 85°C for the original part, providing additional thermal margin. This extended range supports applications with higher ambient temperatures or thermal stress conditions without requiring component derating.

Q: Are there packaging or supply chain considerations for the SRR1260-680M?

A: The SRR1260-680M is supplied in Tape & Reel (TR) packaging with 2500 pieces available in stock, supporting high-volume production requirements. The original B1135AS-680M=P3 is obsolete with limited remaining inventory.