MMT08B310T3 Equivalent & Substitute Parts

Part Overview

The MMT08B310T3 is a 270V off-state, 250A peak pulse TVS thyristor manufactured by onsemi in DO-214AA (SMB) surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part provides transient voltage suppression with a 365V breakover voltage and 3V on-state voltage characteristic.

Substiute Parts

MMT08B310T3

onsemiIn Stock: 1048MMT08B310T3 Datasheet

Current PartRFQ

P3100SBLRP

Littelfuse Inc.In Stock: 119152P3100SBLRP Datasheet

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SMP80MC-270

STMicroelectronicsIn Stock: 1460SMP80MC-270 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MMT08B310T3 is determined by the following critical parameters:

• Voltage - Off State: 270V ±5V tolerance range
• Voltage - Breakover: 345V to 365V range
• Current - Peak Pulse (8/20µs): 200A minimum
• Current - Hold (Ih): 150mA nominal
• Package / Case: DO-214AA, SMB (mandatory)
• Mounting Type: Surface Mount (mandatory)

Substitute parts must maintain functional equivalence within these electrical and mechanical boundaries. Parts meeting these criteria are considered direct replacements for the obsolete MMT08B310T3.

Parameter Comparison

Engineering Selection Recommendations

P3100SBLRP (Littelfuse Inc.) is the primary substitute for MMT08B310T3. This part maintains identical peak pulse current (250A at 8/20µs), matching hold current (150mA), and equivalent off-state voltage (275V vs. 270V). The breakover voltage of 350V falls within acceptable operating range. The part is actively manufactured and ROHS3 compliant, addressing the obsolescence of the original component. Packaging and mounting specifications are identical (DO-214AA, SMB).

SMP80MC-270 (STMicroelectronics) is a secondary substitute option. This part matches the off-state voltage (270V) and hold current (150mA) of the original component. The peak pulse current is reduced to 200A at 8/20µs, representing an 80A reduction from the original specification. The breakover voltage of 345V is within acceptable range. This part is actively manufactured and ROHS3 compliant. Selection of this part requires verification that the 200A peak pulse current rating is sufficient for the application.

Frequently Asked Questions (FAQ)

Q: Can P3100SBLRP directly replace MMT08B310T3 without circuit modification?

A: Yes. P3100SBLRP maintains electrical equivalence across all critical parameters: identical peak pulse current (250A), matching hold current (150mA), and compatible off-state voltage (275V vs. 270V). Package and mounting specifications are identical. No circuit modification is required.

Q: What is the impact of using SMP80MC-270 instead of MMT08B310T3?

A: SMP80MC-270 has a reduced peak pulse current rating of 200A compared to the original 250A specification. This 20% reduction must be evaluated against circuit transient requirements. If peak transient currents exceed 200A, this substitute is not suitable. Off-state voltage and hold current remain compatible.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both P3100SBLRP and SMP80MC-270 are ROHS3 compliant. The original MMT08B310T3 is RoHS non-compliant. Compliance requirements for the application should determine substitute selection.

Q: Do the substitute parts have different capacitance values?

A: Yes. P3100SBLRP has 45pF capacitance (5pF lower than original), and SMP80MC-270 has 25pF (25pF lower than original). In high-frequency applications, lower capacitance may improve performance. In applications sensitive to capacitance values, circuit simulation or testing is necessary to confirm compatibility.

Q: Are packaging and mounting specifications identical across all parts?

A: Yes. MMT08B310T3, P3100SBLRP, and SMP80MC-270 all use DO-214AA (SMB) surface mount package. PCB footprints and reflow profiles are compatible.