MMT08B064T3 Equivalent & Substitute Parts

Part Overview

The MMT08B064T3 is a 58V off-state, 250A peak pulse (8/20µs) transient voltage suppressor thyristor manufactured by onsemi in DO-214AA (SMB) surface mount packaging. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates with a 77V breakover voltage and 150mA hold current, designed for transient suppression applications requiring high peak current handling in compact form factors.

Substiute Parts

MMT08B064T3

onsemiIn Stock: 1203MMT08B064T3 Datasheet

Current PartRFQ

P0640SBLRP

Littelfuse Inc.In Stock: 21319P0640SBLRP Datasheet

SimilarRFQ

P0640SCMCLRP

Littelfuse Inc.In Stock: 20466P0640SCMCLRP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the MMT08B064T3 is determined by strict equivalence in the following electrical and mechanical parameters:

• Voltage - Breakover: 77V
• Voltage - Off State: 58V
• Current - Peak Pulse (8/20µs): 250A minimum
• Current - Hold (Ih): 150mA
• Package / Case: DO-214AA, SMB
• Mounting Type: Surface Mount
• Number of Elements: 1

Two substitute parts are identified:

P0640SBLRP (Littelfuse Inc.) maintains exact electrical equivalence with the MMT08B064T3 across all critical parameters, including identical 250A peak pulse current rating and 150mA hold current. This part is active in production status and RoHS3 compliant.

P0640SCMCLRP (Littelfuse Inc.) provides enhanced current handling with 400A peak pulse (8/20µs) capability while maintaining the same voltage ratings, breakover point, and hold current. This part is active in production status and RoHS3 compliant, suitable for applications requiring higher transient current margins.

Parameter Comparison

Engineering Selection Recommendations

P0640SBLRP is the direct functional equivalent for MMT08B064T3 replacement. Both parts share identical electrical performance across voltage ratings, peak pulse current, and hold current specifications. P0640SBLRP is active in production with RoHS3 compliance, addressing the obsolescence status of the original part. This substitute is suitable for direct board-level replacement without circuit redesign.

P0640SCMCLRP provides enhanced transient current handling at 400A peak pulse (8/20µs) versus the original 250A specification. This part maintains voltage equivalence and is active in production with RoHS3 compliance. Selection of P0640SCMCLRP is appropriate when design margins for transient suppression require higher current capacity or when sourcing the 250A variant becomes constrained.

Both Littelfuse substitutes are available in active production status, ensuring long-term supply continuity compared to the obsolete MMT08B064T3.

Frequently Asked Questions (FAQ)

Q: Can P0640SBLRP directly replace MMT08B064T3 without circuit modification?

A: Yes. P0640SBLRP maintains identical electrical specifications for voltage ratings (77V breakover, 58V off-state), peak pulse current (250A at 8/20µs), and hold current (150mA). Both use DO-214AA SMB packaging for surface mount applications. Direct substitution is electrically and mechanically compatible.

Q: What is the difference between P0640SBLRP and P0640SCMCLRP?

A: Both parts share identical voltage ratings and hold current. P0640SCMCLRP provides higher peak pulse current capability (400A at 8/20µs versus 250A), making it suitable for applications requiring greater transient suppression margin. On-state voltage differs slightly (4V versus 5V), and capacitance values vary (80pF versus 85pF).

Q: Are both substitute parts RoHS compliant?

A: Yes. Both P0640SBLRP and P0640SCMCLRP are RoHS3 compliant, addressing environmental and regulatory requirements that the obsolete MMT08B064T3 does not meet.

Q: Does packaging differ between the original and substitute parts?

A: No. All three parts use identical DO-214AA (SMB) surface mount packaging. PCB footprints and assembly processes remain unchanged.

Q: Which substitute should be selected for new designs?

A: P0640SBLRP provides direct electrical equivalence for designs originally specified with MMT08B064T3. P0640SCMCLRP is appropriate when higher transient current capacity is required or when design margins justify the enhanced specification.