P6SMB18CA-M3/5B Equivalent & Substitute Parts

Part Overview

The P6SMB18CA-M3/5B is a transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This bidirectional Zener diode operates in the DO-214AA (SMB) surface mount package and is designed for general-purpose transient voltage suppression applications. The part is active in production with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified based on matching electrical performance parameters and package compatibility to support procurement flexibility and supply chain continuity.

Substiute Parts

P6SMB18CA-M3/5B

Vishay General Semiconductor - Diodes DivisionIn Stock: 1094P6SMB18CA-M3/5B Datasheet

Current PartRFQ

P6SMB18CA-E3/52

Vishay General Semiconductor - Diodes DivisionIn Stock: 2145P6SMB18CA-E3/52 Datasheet

DirectRFQ

1KSMB18CA

Taiwan Semiconductor CorporationIn Stock: 9791KSMB18CA Datasheet

MFR RecommendedRFQ

P6SMB18CA

Eaton - Electronics DivisionIn Stock: 58036P6SMB18CA Datasheet

MFR RecommendedRFQ

P6SMB18CA

Eaton - Electronics DivisionIn Stock: 58036P6SMB18CA Datasheet

MFR RecommendedRFQ

SM6T18CA

STMicroelectronicsIn Stock: 3757SM6T18CA Datasheet

MFR RecommendedRFQ

SM6T18CAY

STMicroelectronicsIn Stock: 10399SM6T18CAY Datasheet

MFR RecommendedRFQ

TPSMB18CA

Littelfuse Inc.In Stock: 3319TPSMB18CA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P6SMB18CA-M3/5B is determined by the following critical parameters:

• Voltage Rating Match: Reverse standoff voltage of 15.3V, breakdown minimum of 17.1V, and clamping voltage maximum of 25.2V ± tolerance
• Package Compatibility: DO-214AA (SMB) surface mount package required for PCB footprint compatibility
• Current Handling: Peak pulse current capability of 23.8A minimum (10/1000µs pulse definition)
• Power Dissipation: 600W peak pulse power rating
• Electrical Type: Bidirectional Zener diode configuration
• Compliance: RoHS3 compliance and MSL 1 rating

Substitute parts are grouped into two categories: direct equivalents (identical electrical specifications and packaging) and functional equivalents (matching voltage and current parameters with minor performance variations).

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Packaging Variant)

P6SMB18CA-E3/52 is a direct electrical equivalent to P6SMB18CA-M3/5B, differing only in packaging format (Tape & Reel versus Tape & Box). Both parts are manufactured by Vishay with identical electrical specifications. Selection between these variants depends on procurement quantity and assembly process requirements.

Functional Equivalents (Voltage & Current Match)

TPSMB18CA (Littelfuse) and P6SMB18CA (Eaton) maintain the same reverse standoff voltage (15.3V) and comparable peak pulse current ratings (24.2A). Both are RoHS compliant with MSL 1 rating. TPSMB18CA offers extended operating temperature range (-65°C ~ 175°C) and AEC-Q101 automotive qualification. P6SMB18CA (Eaton) operates at -55°C minimum with standard RoHS compliance.

Enhanced Performance Alternatives

1KSMB18CA (Taiwan Semiconductor) provides higher peak pulse current (39.2A) and increased power dissipation (1000W) while maintaining the 15.3V reverse standoff voltage. This part is suitable for applications requiring greater transient energy absorption.

SM6T18CA and SM6T18CAY (STMicroelectronics) offer significantly higher peak pulse current (123A at 8/20µs pulse definition) and elevated clamping voltage (32.5V). SM6T18CAY includes AEC-Q101 automotive qualification. These parts are applicable to high-energy transient suppression requirements.

Compliance Considerations

All substitute parts maintain RoHS3 compliance and MSL 1 rating. SM6T18CAY and TPSMB18CA include AEC-Q101 automotive qualification, suitable for automotive and harsh environment applications. Selection should align with end-application compliance requirements and operating temperature specifications.

Frequently Asked Questions (FAQ)

Q: Can P6SMB18CA-E3/52 be used as a direct replacement for P6SMB18CA-M3/5B?

A: Yes. Both parts are manufactured by Vishay with identical electrical specifications (15.3V VWM, 25.2V clamping voltage, 23.8A peak pulse current). The difference is packaging format: M3/5B uses Tape & Box while E3/52 uses Tape & Reel. PCB footprint and electrical performance are identical.

Q: What is the difference between the 10/1000µs and 8/20µs pulse definitions used in the current ratings?

A: These represent different test pulse waveforms. The 10/1000µs pulse (used for P6SMB18CA, TPSMB18CA, 1KSMB18CA) defines a 10µs rise time and 1000µs decay time. The 8/20µs pulse (used for SM6T18CA, SM6T18CAY) defines an 8µs rise time and 20µs decay time. Peak current values are specific to their respective pulse definitions and are not directly comparable. Selection should match the actual transient waveform in the application.

Q: Can I use 1KSMB18CA or SM6T18CA if my circuit only requires 23.8A suppression?

A: Yes. Both parts exceed the minimum current requirement and will function correctly. 1KSMB18CA provides 39.2A capability with 1000W power rating. SM6T18CA provides 123A capability (8/20µs). Higher current ratings provide additional design margin and are suitable for applications with uncertain or variable transient conditions. Verify that the higher clamping voltage (25.5V for 1KSMB18CA, 32.5V for SM6T18CA) is acceptable for your circuit protection scheme.

Q: Are SM6T18CAY and TPSMB18CA suitable for automotive applications?

A: Both parts carry AEC-Q101 automotive qualification. SM6T18CAY is explicitly qualified for automotive use. TPSMB18CA includes AEC-Q101 qualification and extended operating temperature range (-65°C ~ 175°C). Verify that specific application requirements (temperature cycling, vibration, EMC) align with automotive qualification scope.

Q: What is the impact of different operating temperature ranges on part selection?

A: The P6SMB18CA-M3/5B operates from -65°C to 150°C. TPSMB18CA extends to 175°C maximum, while P6SMB18CA (Eaton) and SM6T18CA/CAY operate to 150°C minimum. Selection depends on end-application temperature requirements. Extended range parts (TPSMB18CA) are preferred for high-temperature environments or applications with limited thermal management.

Q: Can these parts be used interchangeably on the same PCB assembly?

A: All substitute parts use the DO-214AA (SMB) package with identical PCB footprint. They are mechanically and electrically interchangeable at the board level. However, verify that the specific part number is correctly specified in the bill of materials and assembly documentation to ensure procurement of the intended part.