1KSMB110 Equivalent & Substitute Parts

Part Overview

The 1KSMB110 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for telecom applications. This component features a 94V reverse standoff voltage, 152V maximum clamping voltage, and 6.6A peak pulse current capability in a surface mount DO-214AA (SMB) package. The 1KSMB110 is classified as obsolete, necessitating identification of active equivalent parts to maintain design continuity and ensure supply chain availability for new production and field replacements.

Substiute Parts

1KSMB110

Littelfuse Inc.In Stock: 9951KSMB110 Datasheet

Current PartRFQ

1KSMB110A

Littelfuse Inc.In Stock: 144961KSMB110A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1KSMB110 is determined by electrical and mechanical parameter equivalence within the TVS diode category. The primary substitute, 1KSMB110A, maintains identical electrical specifications across all critical parameters: reverse standoff voltage (94V), breakdown voltage (105V minimum), clamping voltage (152V maximum), peak pulse current (6.6A), and peak pulse power (1000W). Both parts utilize the same unidirectional Zener topology, identical package format (DO-214AA/SMB), and surface mount configuration.

The key substitution criteria are:

• Voltage - Reverse Standoff: 94V (identical)
• Voltage - Breakdown (Min): 105V (identical)
• Voltage - Clamping (Max) @ Ipp: 152V (identical)
• Current - Peak Pulse (10/1000µs): 6.6A (identical)
• Power - Peak Pulse: 1000W (identical)
• Package / Case: DO-214AA (SMB) (identical)
• Mounting Type: Surface Mount (identical)
• Type: Zener, Unidirectional (identical)

The 1KSMB110A differs from the original part in product status (active versus obsolete), operating temperature range (−55°C to 150°C versus −65°C to 150°C), packaging format (Tape & Reel versus bulk), and compliance certifications (ROHS3 Compliant and REACH Unaffected versus RoHS Compliant).

Parameter Comparison

Engineering Selection Recommendations

The 1KSMB110A is the direct functional equivalent of the obsolete 1KSMB110 for applications requiring identical electrical performance within the specified voltage and current parameters. Selection of the 1KSMB110A is appropriate for new designs and production environments where active component status and current compliance certifications are required.

The 1KSMB110A maintains full electrical equivalence across all critical TVS diode parameters: reverse standoff voltage, breakdown voltage, clamping voltage, peak pulse current, and peak pulse power. Both parts are manufactured by Littelfuse Inc. and utilize identical package geometry (DO-214AA/SMB) and surface mount configuration, ensuring mechanical and thermal compatibility in existing PCB layouts.

The operating temperature range of the 1KSMB110A (−55°C to 150°C) is narrower than the original 1KSMB110 (−65°C to 150°C) by 10°C at the lower bound. Applications requiring operation below −55°C must evaluate this specification difference against actual system requirements.

The 1KSMB110A carries ROHS3 Compliant and REACH Unaffected certifications, representing current regulatory compliance standards. Both parts maintain identical Moisture Sensitivity Level (MSL 1) and export classification (EAR99), ensuring equivalent handling and logistics requirements.

Frequently Asked Questions (FAQ)

Q: Can the 1KSMB110A directly replace the 1KSMB110 in existing designs?

A: Yes. The 1KSMB110A provides identical electrical performance across all critical TVS diode parameters: 94V reverse standoff voltage, 105V minimum breakdown voltage, 152V maximum clamping voltage, and 6.6A peak pulse current. Both parts use the same DO-214AA (SMB) surface mount package and Zener topology. Mechanical and thermal compatibility is maintained in existing PCB layouts.

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

A: The 1KSMB110A operates from −55°C to 150°C, compared to the 1KSMB110 range of −65°C to 150°C. The 10°C difference at the lower temperature limit affects only applications requiring operation below −55°C. For standard telecom and general-purpose applications operating within −55°C to 150°C, this difference is not a limiting factor.

Q: Are there packaging differences between these parts?

A: The 1KSMB110 is supplied in bulk packaging, while the 1KSMB110A is supplied in Tape & Reel (TR) format. Both parts use the identical DO-214AA (SMB) component package. Tape & Reel packaging is standard for automated assembly processes and does not affect electrical or mechanical performance.

Q: What compliance certifications apply to the 1KSMB110A?

A: The 1KSMB110A is ROHS3 Compliant and REACH Unaffected. Both parts maintain identical Moisture Sensitivity Level (MSL 1), export classification (EAR99), and HTSUS code (8541.10.0080). These certifications ensure compliance with current regulatory requirements for electronic components in telecom and general-purpose applications.

Q: Why is the 1KSMB110 classified as obsolete?

A: The 1KSMB110 is no longer in active production. The 1KSMB110A serves as the active production equivalent, offering identical electrical specifications with current compliance certifications and reliable supply chain availability.

Q: Are the electrical characteristics identical between these parts?

A: Yes. Both parts are specified with identical voltage ratings (94V reverse standoff, 105V breakdown minimum, 152V clamping maximum), current ratings (6.6A peak pulse), and power dissipation (1000W peak pulse). They are functionally equivalent for all TVS diode applications within these electrical parameters.