1KSMB150 Equivalent & Substitute Parts

Part Overview

The 1KSMB150 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for telecom applications. This component features a 128V reverse standoff voltage, 207V maximum clamping voltage, and 4.8A peak pulse current capability in a surface mount DO-214AA (SMB) package. The 1KSMB150 is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. Direct substitutes maintain identical electrical performance while offering improved availability and current product status.

Substiute Parts

1KSMB150

Littelfuse Inc.In Stock: 7201KSMB150 Datasheet

Current PartRFQ

1KSMB150A

Littelfuse Inc.In Stock: 302311KSMB150A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete 1KSMB150 is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

• Voltage - Reverse Standoff (Typ): 128V
• Voltage - Breakdown (Min): 143V
• Voltage - Clamping (Max) @ Ipp: 207V
• Current - Peak Pulse (10/1000µs): 4.8A
• Power - Peak Pulse: 1000W
• Package / Case: DO-214AA, SMB
• Mounting Type: Surface Mount
• Unidirectional Channels: 1
• Type: Zener

The 1KSMB150A qualifies as a direct substitute, maintaining identical electrical specifications and package configuration. Additional cross-reference part numbers (P6SMB150A, SM6T150A, P6SMB150A-E3/52, SZP6SMB150AT3G) represent equivalent devices from alternative manufacturers or variant designations that satisfy the same parameter requirements.

Parameter Comparison

Engineering Selection Recommendations

The 1KSMB150A is the primary active substitute for the obsolete 1KSMB150. Both components are manufactured by Littelfuse Inc. and maintain identical electrical and mechanical specifications across all critical parameters. The 1KSMB150A offers superior product availability with 30,200 units in stock compared to the 1KSMB150's 691 units.

Compliance Considerations:

The 1KSMB150A carries ROHS3 compliance certification, representing current regulatory standards. The original 1KSMB150 carries RoHS compliance. Both devices maintain MSL 1 (Unlimited) moisture sensitivity rating and EAR99 export classification.

Temperature Operating Range:

The 1KSMB150A specifies a minimum operating temperature of -55°C compared to the 1KSMB150's -65°C. For applications requiring operation below -55°C, the original part specification must be verified against actual system requirements.

Cross-Reference Alternatives:

The part numbers P6SMB150A, SM6T150A, P6SMB150A-E3/52, and SZP6SMB150AT3G represent equivalent TVS diodes meeting identical electrical parameters. These alternatives are suitable for applications where Littelfuse-specific sourcing is not mandated.

Frequently Asked Questions (FAQ)

Q: Can the 1KSMB150A directly replace the 1KSMB150 in existing designs?

A: Yes. The 1KSMB150A maintains identical electrical specifications (128V standoff, 207V clamping, 4.8A peak pulse) and package configuration (DO-214AA, SMB surface mount). The primary difference is product status (active vs. obsolete) and operating temperature minimum (-55°C vs. -65°C).

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

A: The 1KSMB150 operates from -65°C to 150°C, while the 1KSMB150A operates from -55°C to 150°C. Applications requiring operation below -55°C must retain the original 1KSMB150 specification or verify system requirements do not mandate this lower temperature threshold.

Q: Are the cross-reference part numbers (P6SMB150A, SM6T150A, etc.) equivalent to the 1KSMB150A?

A: These part numbers represent equivalent TVS diodes that satisfy the same electrical and mechanical parameters. They originate from alternative manufacturers or variant designations but maintain the 128V standoff, 207V clamping, and 4.8A peak pulse specifications required for direct substitution.

Q: What is the difference between RoHS and ROHS3 compliance?

A: ROHS3 represents the current regulatory standard for Restriction of Hazardous Substances. Both certifications indicate compliance with hazardous substance restrictions; ROHS3 reflects the updated standard applicable to the 1KSMB150A as an active product.

Q: Is the DO-214AA package identical to the SMB package?

A: Yes. DO-214AA and SMB designate the same surface mount package configuration. Both terms are used interchangeably in component specifications and PCB design documentation.

Q: What does MSL 1 (Unlimited) moisture sensitivity mean?

A: MSL 1 indicates the lowest moisture sensitivity level. Components with this rating require no special moisture control during storage, handling, or assembly, simplifying supply chain and manufacturing processes.

Q: Can I use the 1KSMB150A in automotive applications?

A: The original 1KSMB150 carries an automotive grade designation. The 1KSMB150A specification provided does not include automotive grade classification. Automotive applications must verify grade requirements against the specific substitute part selected.