1KSMB10C Equivalent & Substitute Parts

Part Overview

The 1KSMB10C 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 8.55V and provides clamping at 14.5V maximum, with a peak pulse current rating of 69A. The device is housed in a DO-214AA (SMB) surface mount package and is rated for automotive applications.

The 1KSMB10C is classified as obsolete, making it necessary to identify equivalent substitute parts that maintain electrical and mechanical compatibility while offering active product status and continued availability.

Substiute Parts

1KSMB10C

Littelfuse Inc.In Stock: 8891KSMB10C Datasheet

Current PartRFQ

1KSMB10CA

Taiwan Semiconductor CorporationIn Stock: 143581KSMB10CA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1KSMB10C is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Must Match):

• Voltage - Reverse Standoff (Typ): 8.55V
• Voltage - Breakdown (Min): 9.5V
• Voltage - Clamping (Max) @ Ipp: 14.5V
• Current - Peak Pulse (10/1000µs): 69A
• Power - Peak Pulse: 1000W

Mechanical Parameters (Must Match):

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

Device Type (Must Match):

• Type: Zener
• Category: Transient Voltage Suppressors (TVS)

The 1KSMB10CA meets all electrical and mechanical requirements for direct substitution. Both devices share identical voltage ratings, current handling capacity, power dissipation, and physical packaging specifications. The primary distinction is product status and manufacturer origin.

Parameter Comparison

Engineering Selection Recommendations

The 1KSMB10CA is a direct electrical and mechanical equivalent to the 1KSMB10C. Selection of the substitute part is supported by the following factors:

Product Status: The 1KSMB10C is classified as obsolete, whereas the 1KSMB10CA maintains active product status. This ensures continued availability and supply chain reliability for new designs and production runs.

Compliance Certifications: The 1KSMB10CA carries ROHS3 compliance, representing an updated regulatory standard compared to the RoHS compliance of the 1KSMB10C. Both devices are EAR99 classified and share identical HTSUS codes (8541.10.0080).

Operating Temperature Range: The 1KSMB10CA provides an extended operating temperature range of -55°C to 175°C compared to the 1KSMB10C range of -65°C to 150°C. This extended range accommodates a broader spectrum of thermal environments.

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, ensuring functional interchangeability in circuit applications.

Packaging Consideration: The 1KSMB10CA is supplied in Tape & Reel (TR) format, which is standard for automated assembly processes, whereas the 1KSMB10C was supplied in bulk packaging. This difference does not affect electrical or mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 1KSMB10CA be used as a direct replacement for the 1KSMB10C in existing designs?

A: Yes. The 1KSMB10CA is electrically and mechanically equivalent to the 1KSMB10C. All voltage ratings, current ratings, power dissipation, package type, and mounting specifications are identical. The substitute part can be used without circuit modification.

Q: What is the significance of the product status difference between the two parts?

A: The 1KSMB10C is classified as obsolete, indicating that Littelfuse Inc. has discontinued production and support for this part. The 1KSMB10CA maintains active product status, ensuring ongoing availability, technical support, and supply chain continuity.

Q: Are there any compliance or regulatory differences between these parts?

A: Both parts are RoHS compliant and EAR99 classified. The 1KSMB10CA carries ROHS3 compliance, which represents a more current regulatory standard. Both devices are REACH unaffected or compliant, making them suitable for applications subject to environmental regulations.

Q: Does the operating temperature range difference affect substitution?

A: The 1KSMB10CA provides an extended operating temperature range (-55°C to 175°C) compared to the 1KSMB10C (-65°C to 150°C). This extended range does not create incompatibility; it provides additional thermal margin for applications operating at elevated temperatures. Applications within the 1KSMB10C temperature range operate within the 1KSMB10CA specifications.

Q: What is the difference between bulk and Tape & Reel packaging?

A: Bulk packaging is used for manual assembly or small-quantity applications, while Tape & Reel (TR) packaging is designed for automated pick-and-place assembly processes. Both formats contain identical components. The packaging format does not affect electrical or mechanical performance.

Q: Are the electrical characteristics guaranteed to be identical?

A: Yes. Both parts share identical specifications for reverse standoff voltage (8.55V), breakdown voltage (9.5V minimum), clamping voltage (14.5V maximum), peak pulse current (69A), and peak pulse power (1000W). These parameters define the functional behavior of the TVS diode in circuit protection applications.

Q: Can inventory of the 1KSMB10C be replaced with 1KSMB10CA stock?

A: Yes. The 1KSMB10CA is available in significantly higher quantities (14,300 pieces) compared to the 1KSMB10C (857 pieces). The substitute part can be used to replenish inventory for production and field service applications.