1KSMB7.5C Equivalent & Substitute Parts

Part Overview

The 1KSMB7.5C is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for transient overvoltage protection in telecom applications. This component features a 6.4V reverse standoff voltage, 11.3V maximum clamping voltage, and 88.5A peak pulse current capability in a surface mount DO-214AA (SMB) package.

The 1KSMB7.5C is classified as Obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this TVS diode specification.

Substiute Parts

1KSMB7.5C

Littelfuse Inc.In Stock: 8851KSMB7.5C Datasheet

Current PartRFQ

1KSMB7.5CA

Littelfuse Inc.In Stock: 93861KSMB7.5CA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1KSMB7.5C is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

• Voltage - Reverse Standoff (Typ): 6.4V
• Voltage - Clamping (Max) @ Ipp: 11.3V
• Current - Peak Pulse (10/1000µs): 88.5A (±tolerance acceptable)
• Power - Peak Pulse: 1000W
• Package / Case: DO-214AA, SMB
• Mounting Type: Surface Mount
• Bidirectional Channels: 1

The 1KSMB7.5CA qualifies as a direct substitute based on identical electrical performance specifications and package configuration. Both parts maintain the same voltage ratings, clamping characteristics, and power dissipation capability. The 1KSMB7.5CA differs in product status (Active vs. Obsolete), packaging format (Tape & Reel vs. bulk), and operating temperature lower limit (-55°C vs. -65°C), with the latter representing a narrower but acceptable operating range for most applications.

Parameter Comparison

Engineering Selection Recommendations

The 1KSMB7.5CA is the direct substitute for the obsolete 1KSMB7.5C. Selection of this substitute is based on the following engineering criteria:

Electrical Equivalence: The 1KSMB7.5CA maintains identical voltage ratings (6.4V reverse standoff, 11.3V clamping) and equivalent peak pulse current (88.3A vs. 88.5A, representing a 0.2A variance within acceptable tolerance). Power dissipation capability remains constant at 1000W peak pulse.

Package and Mounting Compatibility: Both parts utilize the DO-214AA (SMB) surface mount package, ensuring direct PCB footprint compatibility without layout modifications.

Compliance Status: The 1KSMB7.5CA carries ROHS3 compliance certification, meeting current regulatory requirements. Both parts maintain MSL Level 1 (Unlimited) moisture sensitivity rating, indicating no special storage or handling requirements.

Product Availability: The 1KSMB7.5CA is classified as Active with substantial inventory availability (9,300 pcs), ensuring reliable supply chain access compared to the Obsolete status of the original part.

Operating Temperature Consideration: The 1KSMB7.5CA operates across -55°C to 150°C, compared to the original -65°C to 150°C range. Applications requiring operation below -55°C require design review to confirm compatibility with the narrower temperature specification.

Frequently Asked Questions (FAQ)

Q: Can the 1KSMB7.5CA be used as a direct replacement for the 1KSMB7.5C in existing designs?

A: Yes. The 1KSMB7.5CA is electrically and mechanically equivalent to the 1KSMB7.5C. Both parts share identical voltage ratings, clamping characteristics, power dissipation, and DO-214AA surface mount package configuration. The peak pulse current variance (88.3A vs. 88.5A) is negligible for circuit protection applications.

Q: What is the difference in operating temperature range between these parts?

A: The 1KSMB7.5C operates from -65°C to 150°C, while the 1KSMB7.5CA operates from -55°C to 150°C. The substitute part has a narrower lower temperature limit by 10°C. Applications operating exclusively within the -55°C to 150°C range experience no functional impact. Applications requiring operation below -55°C must be evaluated for compatibility.

Q: Are there packaging differences between the 1KSMB7.5C and 1KSMB7.5CA?

A: Both parts are supplied in DO-214AA (SMB) surface mount packages with identical footprints. The primary packaging difference is format: the 1KSMB7.5C is available in bulk, while the 1KSMB7.5CA is supplied in Tape & Reel (TR) format. This difference does not affect electrical performance or PCB assembly compatibility.

Q: Do both parts meet RoHS compliance requirements?

A: Yes. The 1KSMB7.5C is RoHS Compliant, and the 1KSMB7.5CA is ROHS3 Compliant. Both parts satisfy current RoHS regulatory requirements. The ROHS3 designation on the substitute part indicates compliance with the most current RoHS directive revision.

Q: What is the significance of the 0.2A difference in peak pulse current specification?

A: The 1KSMB7.5C specifies 88.5A peak pulse current, while the 1KSMB7.5CA specifies 88.3A. This 0.2A variance (0.23% difference) is within normal manufacturing tolerance for TVS diodes and does not affect circuit protection performance or component selection for standard transient suppression applications.

Q: Is the 1KSMB7.5CA suitable for telecom applications?

A: The 1KSMB7.5CA is classified for General Purpose applications, while the original 1KSMB7.5C was specified for Telecom applications. Both parts possess identical electrical and mechanical specifications required for transient voltage suppression. Application suitability depends on specific circuit requirements rather than manufacturer application classification.

Q: What is the inventory status of the 1KSMB7.5CA?

A: The 1KSMB7.5CA is classified as Active with 9,300 pcs in stock, providing reliable supply chain availability. The original 1KSMB7.5C is Obsolete, making the 1KSMB7.5CA the recommended source for ongoing procurement.