1KSMB9.1C Equivalent & Substitute Parts

Part Overview

The 1KSMB9.1C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for surface mount applications in the DO-214AA (SMBJ) package. This component provides bidirectional overvoltage protection with a 13.4V clamping voltage and 74.6A peak pulse current capability. The 1KSMB9.1C is classified as obsolete, necessitating identification of active equivalent parts to ensure continued design support and procurement availability. Substitute parts must maintain identical electrical performance characteristics and mechanical compatibility while offering active product status and improved supply chain availability.

Substiute Parts

1KSMB9.1C

Littelfuse Inc.In Stock: 12131KSMB9.1C Datasheet

Current PartRFQ

1KSMB9.1CA

Littelfuse Inc.In Stock: 94651KSMB9.1CA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1KSMB9.1C is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part must satisfy the following criteria:

Electrical Equivalence Requirements:

• Voltage - Reverse Standoff (Typ): 7.78V
• Voltage - Breakdown (Min): 8.65V
• Voltage - Clamping (Max) @ Ipp: 13.4V
• Current - Peak Pulse (10/1000µs): 74.6A
• Power - Peak Pulse: 1000W

Mechanical Compatibility Requirements:

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

Functional Requirements:

• Category: Transient Voltage Suppressors (TVS)
• Manufacturer: Littelfuse Inc.
• Series: 1KSMB

The 1KSMB9.1CA meets all substitution criteria as a direct equivalent with identical electrical specifications and mechanical form factor. The primary distinction is product status (active versus obsolete) and packaging configuration (Tape & Reel versus bulk).

Parameter Comparison

Engineering Selection Recommendations

The 1KSMB9.1CA is a direct functional and mechanical equivalent to the 1KSMB9.1C. Both parts are manufactured by Littelfuse Inc. and share identical electrical specifications across all critical parameters: reverse standoff voltage, breakdown voltage, clamping voltage, peak pulse current, and peak pulse power.

Product Status Consideration: The 1KSMB9.1C is classified as obsolete, while the 1KSMB9.1CA maintains active product status. Active status ensures continued manufacturing support, documented supply chain availability, and access to current technical documentation.

Compliance Status: Both parts are RoHS compliant. The 1KSMB9.1CA carries ROHS3 compliance designation, representing the current regulatory standard. Both parts maintain Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity constraints during storage or handling.

Operating Temperature Range: The 1KSMB9.1C specifies an operating temperature range of -65°C to 150°C, while the 1KSMB9.1CA specifies -55°C to 150°C. The substitute part has a narrower lower temperature limit by 10°C. Applications requiring operation below -55°C must evaluate this specification difference against design requirements.

Packaging Configuration: The primary physical distinction is packaging format. The 1KSMB9.1C is supplied in bulk configuration, while the 1KSMB9.1CA is supplied in Tape & Reel (TR) format. Both are surface mount components in the DO-214AA (SMBJ) package and are mechanically interchangeable on printed circuit boards.

Frequently Asked Questions (FAQ)

Q: Can the 1KSMB9.1CA be used as a direct replacement for the 1KSMB9.1C in existing designs?

A: Yes. The 1KSMB9.1CA is electrically and mechanically equivalent to the 1KSMB9.1C. Both parts have identical voltage ratings (7.78V reverse standoff, 8.65V breakdown minimum, 13.4V clamping maximum), identical peak pulse current (74.6A), and identical power dissipation (1000W). Both are packaged in DO-214AA (SMBJ) surface mount form factor and are pin-compatible.

Q: What is the difference between the 1KSMB9.1C and 1KSMB9.1CA?

A: The primary differences are product status and packaging configuration. The 1KSMB9.1C is obsolete and supplied in bulk packaging. The 1KSMB9.1CA is active and supplied in Tape & Reel (TR) format. The 1KSMB9.1CA also has a narrower operating temperature range (-55°C to 150°C versus -65°C to 150°C), representing a 10°C reduction in the lower temperature limit.

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

A: Both parts are RoHS compliant. The 1KSMB9.1CA carries ROHS3 compliance, which is the current regulatory standard. Both parts maintain identical Moisture Sensitivity Level 1 (Unlimited) ratings. The 1KSMB9.1CA includes REACH Unaffected status documentation.

Q: Does the Tape & Reel packaging of the 1KSMB9.1CA affect circuit board assembly?

A: No. Tape & Reel packaging is a supply and handling format that does not affect the component itself or its performance on the circuit board. The physical component remains identical in form, fit, and function. Tape & Reel format is standard for automated assembly processes and provides improved handling efficiency compared to bulk packaging.

Q: What applications are these TVS diodes suitable for?

A: The 1KSMB9.1C is specified for telecom applications. The 1KSMB9.1CA is specified for general purpose applications. Both parts function as transient voltage suppressors for overvoltage protection in surface mount circuits requiring 7.78V standoff voltage and 13.4V clamping voltage specifications.

Q: Is the 10°C difference in minimum operating temperature significant?

A: The significance depends on application requirements. The 1KSMB9.1C operates from -65°C to 150°C, while the 1KSMB9.1CA operates from -55°C to 150°C. Applications requiring operation below -55°C must use the 1KSMB9.1C or identify alternative parts. Applications operating within -55°C to 150°C range are unaffected by this specification difference.