SMP80MC-320 Equivalent & Substitute Parts

Part Overview

The SMP80MC-320 is a 320V off-state thyristor-based transient voltage suppressor manufactured by STMicroelectronics in the TRISIL™ series. This component is packaged in DO-214AA (SMB) surface mount format and is designed to handle peak pulse currents of 200 A at 8/20µs pulse duration. The product is currently obsolete, necessitating identification of functionally equivalent alternatives that maintain compatibility with existing circuit designs while meeting the same electrical and mechanical specifications.

Substiute Parts

SMP80MC-320

STMicroelectronicsIn Stock: 2362SMP80MC-320 Datasheet

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P3500SCMCLRP

Littelfuse Inc.In Stock: 2242P3500SCMCLRP Datasheet

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SMBJ300CA

MeritekIn Stock: 23875SMBJ300CA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMP80MC-320 is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - Off State: 320V (exact match required)
• Voltage - Breakover: 400V (exact match required)
• Package / Case: DO-214AA, SMB (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Number of Elements: 1 (exact match required)

Secondary Compatibility Parameters:

• Current - Hold (Ih): 150 mA (exact match required)
• RoHS Status: ROHS3 Compliant (compliance requirement)
• Moisture Sensitivity Level: 1 (Unlimited) (environmental requirement)

Substitute parts must satisfy all primary criteria and secondary compatibility parameters. Current ratings, capacitance, and on-state voltage may vary within acceptable design margins provided the core voltage and mechanical specifications remain identical.

Parameter Comparison

Engineering Selection Recommendations

P3500SCMCLRP (Littelfuse Inc.) - Primary Substitute

The P3500SCMCLRP is a direct functional equivalent to the SMP80MC-320. Both components share identical off-state voltage (320V), breakover voltage (400V), hold current (150 mA), and package format (DO-214AA, SMB). The P3500SCMCLRP is manufactured by Littelfuse Inc. under the SIDACtor® series and maintains active product status. This component exceeds the current handling capability of the original part (400A peak pulse at 8/20µs versus 200A), providing enhanced performance margin. Both components are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) rating. The P3500SCMCLRP is supplied in Tape & Reel packaging format.

SMBJ300CA (Meritek) - Limited Compatibility

The SMBJ300CA is a TVS diode (Zener type) rather than a thyristor-based suppressor. While it shares the DO-214AA (SMB) package format and surface mount mounting type, it does not meet the primary substitution criteria. The off-state voltage is 300V (not 320V), and the component lacks a defined breakover voltage specification characteristic of thyristor devices. The peak pulse current rating (1.23A at 10/1000µs) is substantially lower than the original specification. This component is not suitable as a direct substitute for the SMP80MC-320 in applications requiring thyristor-based transient suppression at the specified voltage and current levels.

Frequently Asked Questions (FAQ)

Q: Can the P3500SCMCLRP directly replace the SMP80MC-320 in existing designs?

A: Yes. The P3500SCMCLRP meets all primary substitution criteria: identical off-state voltage (320V), breakover voltage (400V), hold current (150 mA), and package format (DO-214AA, SMB). Both components are single-element surface mount thyristor suppressors with equivalent environmental compliance ratings.

Q: Why is the SMBJ300CA not recommended as a substitute?

A: The SMBJ300CA is a Zener diode TVS device, not a thyristor suppressor. It does not meet the required off-state voltage specification (300V versus 320V required) and lacks thyristor-specific electrical characteristics such as defined breakover voltage. The peak pulse current capability (1.23A) is insufficient for applications requiring 200A suppression.

Q: Are there packaging differences between the main part and P3500SCMCLRP?

A: Both components use the DO-214AA (SMB) package format and surface mount mounting type. The P3500SCMCLRP is supplied in Tape & Reel (TR) packaging, while the original SMP80MC-320 packaging format was not specified in the component data. This difference does not affect electrical compatibility or circuit board integration.

Q: What is the significance of the higher current rating in the P3500SCMCLRP?

A: The P3500SCMCLRP is rated for 400A peak pulse current at 8/20µs, compared to 200A for the SMP80MC-320. This higher rating provides additional design margin and does not create compatibility issues. The component will function correctly in circuits designed for the lower current specification.

Q: Are compliance certifications identical between the main part and substitute?

A: Yes. Both the SMP80MC-320 and P3500SCMCLRP are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity ratings. Both components meet the same environmental and regulatory requirements.

Q: What is the difference in capacitance between the main part and P3500SCMCLRP?

A: The P3500SCMCLRP has 40pF capacitance compared to 25pF for the SMP80MC-320. This difference may affect high-frequency circuit behavior. Circuit designers should evaluate the impact on signal integrity and EMI performance for applications sensitive to device capacitance.