1KSMB100C Equivalent & Substitute Parts

Part Overview

The 1KSMB100C is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for transient overvoltage protection in electronic circuits. This bidirectional zener diode operates with a reverse standoff voltage of 85.5V and provides clamping at 137V maximum, with a peak pulse current rating of 7.3A. The device is housed in a DO-214AA (SMB) surface mount package suitable for automotive and telecom applications.

The 1KSMB100C is classified as obsolete, which necessitates identification of equivalent substitute components for ongoing design support, maintenance, and new production requirements. Active equivalent parts ensure continued availability and supply chain reliability.

Substiute Parts

1KSMB100C

Littelfuse Inc.In Stock: 12451KSMB100C Datasheet

Current PartRFQ

1KSMB100CA

Taiwan Semiconductor CorporationIn Stock: 142791KSMB100CA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1KSMB100C is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Parameters (Must Match):

• Voltage - Reverse Standoff (Typ): 85.5V
• Voltage - Breakdown (Min): 95V
• Voltage - Clamping (Max) @ Ipp: 137V
• Current - Peak Pulse (10/1000µs): 7.3A
• Power - Peak Pulse: 1000W

Mechanical Parameters (Must Match):

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

The substitute part 1KSMB100CA, manufactured by Taiwan Semiconductor Corporation, meets all specified electrical and mechanical parameters. Both devices are classified as single-channel bidirectional zener TVS diodes in DO-214AA surface mount packages with identical voltage and current ratings. The primary distinction is product status: the original part is obsolete while the substitute is active, with expanded operating temperature range and enhanced compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The 1KSMB100CA is a direct electrical and mechanical equivalent to the 1KSMB100C. Selection of the substitute part is based on the following engineering criteria:

Product Status: The 1KSMB100C is obsolete, limiting long-term availability and supply chain continuity. The 1KSMB100CA maintains active product status, ensuring sustained manufacturing support and component availability.

Compliance Certifications: Both parts are RoHS compliant. The 1KSMB100CA carries ROHS3 compliance and REACH Unaffected status, providing enhanced regulatory alignment for current manufacturing standards.

Operating Temperature Range: The 1KSMB100CA specifies an operating temperature range of -55°C to 175°C, compared to the original part's -65°C to 150°C range. The substitute provides a wider upper temperature limit, suitable for high-temperature applications.

Electrical Equivalence: All critical electrical parameters—reverse standoff voltage, breakdown voltage, clamping voltage, peak pulse current, and peak pulse power—are identical between the two devices. Direct functional substitution is supported without circuit redesign.

Packaging Consideration: The 1KSMB100CA is supplied in Tape & Reel format, standard for high-volume production environments, whereas the original part was supplied in bulk packaging. This difference does not affect electrical performance or PCB-level compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 1KSMB100CA be used as a direct replacement for the 1KSMB100C in existing designs?

A: Yes. The 1KSMB100CA is electrically and mechanically equivalent. All voltage ratings, current ratings, and package specifications are identical. The device can be substituted without circuit modification.

Q: What is the significance of the operating temperature range difference?

A: The 1KSMB100CA operates from -55°C to 175°C, while the original operates from -65°C to 150°C. The substitute provides a higher maximum junction temperature rating. For applications operating below 150°C, both parts are functionally equivalent. For applications requiring operation above 150°C, the substitute is the appropriate selection.

Q: Are there any compliance or certification differences between the two parts?

A: Both parts are RoHS compliant. The 1KSMB100CA carries ROHS3 compliance and REACH Unaffected designation, reflecting current regulatory standards. The original part carries standard RoHS compliance. Both are suitable for regulated applications; the substitute offers enhanced compliance documentation.

Q: Does the Tape & Reel packaging of the 1KSMB100CA affect circuit performance?

A: No. Packaging format (Tape & Reel versus bulk) affects supply chain logistics and assembly processes but does not alter electrical performance or PCB-level functionality. The component itself is identical.

Q: What is the basis for substitution between these two parts?

A: Substitution is based on strict equivalence of electrical parameters (voltage ratings, current ratings, power dissipation) and mechanical parameters (package type, mounting method, channel configuration). Both devices are single-channel bidirectional zener TVS diodes in DO-214AA surface mount packages with identical performance specifications.

Q: Is the 1KSMB100CA suitable for automotive applications?

A: The original 1KSMB100C carries an automotive grade designation. The 1KSMB100CA is specified for general purpose applications. For automotive-specific requirements, verification of the substitute part's automotive qualification status with the manufacturer is necessary prior to design implementation.