1KSMB30C Equivalent & Substitute Parts

Part Overview

The 1KSMB30C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for surface mount applications in DO-214AA (SMB) packaging. This bidirectional zener diode provides transient voltage suppression with a 25.6V reverse standoff voltage and 41.4V maximum clamping voltage, rated for 24.2A peak pulse current and 1000W peak pulse power. The device is classified as obsolete, necessitating identification of active equivalent alternatives for continued system design and procurement.

Substiute Parts

1KSMB30C

Littelfuse Inc.In Stock: 8901KSMB30C Datasheet

Current PartRFQ

1KSMB30CA

Taiwan Semiconductor CorporationIn Stock: 183271KSMB30CA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 1KSMB30CA qualifies as a direct substitute for the 1KSMB30C based on the following electrical and mechanical parameters:

Matching Electrical Specifications:

• Voltage - Reverse Standoff (Typ): 25.6V
• Voltage - Breakdown (Min): 28.5V
• Voltage - Clamping (Max) @ Ipp: 41.4V
• Current - Peak Pulse (10/1000µs): 24.2A
• Power - Peak Pulse: 1000W

Matching Mechanical Specifications:

• Package / Case: DO-214AA, SMB
• Mounting Type: Surface Mount
• Bidirectional Channels: 1
• Type: Zener

Substitution Basis: The 1KSMB30CA maintains identical electrical performance across all critical transient suppression parameters. Both devices operate within the same voltage and current ratings, ensuring equivalent circuit protection characteristics. The mechanical compatibility is confirmed through identical package designation and surface mount configuration, allowing direct PCB placement without design modification.

Parameter Comparison

Engineering Selection Recommendations

The 1KSMB30CA is a qualified substitute for the obsolete 1KSMB30C. Selection criteria are based on the following factors:

Product Status Consideration: The 1KSMB30C is classified as obsolete, while the 1KSMB30CA maintains active product status with Taiwan Semiconductor Corporation. Active status ensures continued availability, manufacturing support, and supply chain reliability for new designs and production runs.

Compliance and Certification: Both devices maintain RoHS compliance. The 1KSMB30CA carries ROHS3 certification, representing current regulatory compliance standards. Both devices are REACH unaffected and carry identical ECCN and HTSUS classifications, confirming regulatory equivalence.

Electrical Performance: All critical electrical parameters are identical between the two devices. The 1KSMB30CA provides an extended operating temperature range (-55°C to 175°C versus -65°C to 150°C), offering broader thermal operational capability without compromising the specified performance envelope.

Packaging and Mechanical Compatibility: Both devices utilize DO-214AA (SMB) surface mount packaging with identical mechanical specifications, enabling direct substitution without PCB redesign or assembly process modification.

Inventory and Availability: The 1KSMB30CA demonstrates significantly higher inventory availability (18,300 pieces) compared to the 1KSMB30C (813 pieces), supporting production continuity and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the 1KSMB30CA be used as a direct replacement for the 1KSMB30C without circuit modification?

A: Yes. The 1KSMB30CA provides identical electrical performance across all transient suppression parameters (voltage, current, and power ratings) and maintains the same DO-214AA surface mount package configuration. No circuit redesign is required.

Q: What is the primary reason for substituting the 1KSMB30C?

A: The 1KSMB30C is classified as obsolete. The 1KSMB30CA is an active product with equivalent electrical specifications and superior supply chain availability, ensuring long-term procurement viability.

Q: Are there packaging differences between these devices?

A: Both devices use DO-214AA (SMB) surface mount packaging. The 1KSMB30C is supplied in standard packaging, while the 1KSMB30CA is supplied in Tape & Reel (TR) format. Both are compatible with standard surface mount assembly processes.

Q: How do the operating temperature ranges compare?

A: The 1KSMB30C operates from -65°C to 150°C, while the 1KSMB30CA operates from -55°C to 175°C. The substitute provides an extended upper temperature limit, offering broader thermal capability for high-temperature applications.

Q: Are both devices RoHS compliant?

A: Yes. The 1KSMB30C is RoHS compliant, and the 1KSMB30CA is ROHS3 compliant, representing current regulatory standards. Both devices meet environmental compliance requirements.

Q: What are the key electrical parameters that determine substitution eligibility?

A: Substitution is determined by matching voltage ratings (25.6V reverse standoff, 28.5V breakdown minimum, 41.4V clamping maximum), current rating (24.2A peak pulse), power rating (1000W peak pulse), and package configuration (DO-214AA SMB surface mount). The 1KSMB30CA matches all these parameters.

Q: Is the 1KSMB30CA suitable for automotive applications?

A: The 1KSMB30C carries an automotive grade designation. The 1KSMB30CA is classified for general purpose applications. Application-specific requirements should be evaluated based on end-use specifications and automotive qualification standards if required.