1KSMB91A Equivalent & Substitute Parts

Part Overview

The 1KSMB91A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component operates with a reverse standoff voltage of 77.8V and provides clamping at 125V maximum, with a peak pulse current rating of 8A. The part is currently in active production status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges for this product category.

Substiute Parts

1KSMB91A

Littelfuse Inc.In Stock: 94991KSMB91A Datasheet

Current PartRFQ

SMBJP6KE91A-TP

Micro Commercial CoIn Stock: 2484SMBJP6KE91A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1KSMB91A is permissible when the following critical parameters are maintained within specification:

• Voltage - Reverse Standoff (Typ): 77.8V
• Voltage - Breakdown (Min): 86.5V
• Voltage - Clamping (Max) @ Ipp: 125V
• Package / Case: DO-214AA, SMB (surface mount compatibility)
• Unidirectional Channels: 1
• Type: Zener
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant

The substitute part SMBJP6KE91A-TP, manufactured by Micro Commercial Co, meets these core electrical and mechanical requirements. Variations in Current - Peak Pulse (8A vs. 4.9A) and Power - Peak Pulse (1000W vs. 600W) represent reduced performance ratings in the substitute, which is acceptable for applications where the full current capacity of the primary part is not required. Operating temperature range extension (-55 to 175°C vs. -55 to 150°C) in the substitute provides additional thermal margin.

Parameter Comparison

Engineering Selection Recommendations

Both the 1KSMB91A and SMBJP6KE91A-TP are active production components with ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component procurement. Selection between these parts should be based on application current requirements:

• Use 1KSMB91A when peak pulse current capacity of 8A and 1000W peak pulse power are required.
• Use SMBJP6KE91A-TP when peak pulse current requirements do not exceed 4.9A and 600W peak pulse power is sufficient. This substitute offers extended operating temperature range to 175°C, providing additional thermal headroom in high-temperature environments.

Both parts maintain identical voltage protection characteristics (77.8V standoff, 86.5V breakdown minimum, 125V clamping maximum) and are mechanically compatible in DO-214AA SMB surface-mount footprints. Packaging format (Tape & Reel) is consistent across both options.

Frequently Asked Questions (FAQ)

Q: Can SMBJP6KE91A-TP be used as a direct replacement for 1KSMB91A in all applications?

A: SMBJP6KE91A-TP is electrically compatible for voltage protection functions, but has reduced current and power ratings (4.9A and 600W vs. 8A and 1000W). Substitution is valid only when the application's peak pulse current does not exceed 4.9A.

Q: Are the mechanical packages identical?

A: Yes. Both parts use DO-214AA SMB surface-mount packages and are compatible with identical PCB footprints.

Q: What is the difference in operating temperature range?

A: The 1KSMB91A operates from -55°C to 150°C, while SMBJP6KE91A-TP extends to 175°C. The substitute provides 25°C additional upper temperature margin.

Q: Do both parts meet the same compliance standards?

A: Yes. Both are ROHS3 compliant, REACH unaffected, and carry identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications.

Q: What determines whether these parts are interchangeable?

A: Interchangeability is determined by matching voltage protection parameters (reverse standoff, breakdown, and clamping voltages), package type (DO-214AA SMB), and ensuring the application's peak pulse current requirement does not exceed the substitute's 4.9A rating.