P6SMB7.5AT3 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The P6SMB7.5AT3 is a unidirectional Zener-type transient voltage suppressor diode manufactured by onsemi in SMB (DO-214AA) surface mount package. This component is designed for transient overvoltage protection in electronic circuits with a reverse standoff voltage of 6.4V and clamping voltage of 11.3V at peak pulse current. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

P6SMB7.5AT3

onsemiIn Stock: 915P6SMB7.5AT3 Datasheet

Current PartRFQ

P6SMB7.5A

Taiwan Semiconductor CorporationIn Stock: 300116P6SMB7.5A Datasheet

DirectRFQ

P6SMB7.5A

Taiwan Semiconductor CorporationIn Stock: 300116P6SMB7.5A Datasheet

DirectRFQ

1KSMB7.5A

Littelfuse Inc.In Stock: 94941KSMB7.5A Datasheet

SimilarRFQ

PTVS6V5P1UP,115

NXP USA Inc.In Stock: 4151PTVS6V5P1UP,115 Datasheet

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SM6T7V5A

STMicroelectronicsIn Stock: 9706SM6T7V5A Datasheet

SimilarRFQ

SM6T7V5AY

STMicroelectronicsIn Stock: 1581SM6T7V5AY Datasheet

SimilarRFQ

SMBJ6.5A

Taiwan Semiconductor CorporationIn Stock: 18060SMBJ6.5A Datasheet

SimilarRFQ

SMBJ6.5A

Taiwan Semiconductor CorporationIn Stock: 18060SMBJ6.5A Datasheet

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SMBJP6KE7.5A-TP

Micro Commercial CoIn Stock: 827SMBJP6KE7.5A-TP Datasheet

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TVP06B7V5A-G

Comchip TechnologyIn Stock: 1103TVP06B7V5A-G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the P6SMB7.5AT3 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 6.4V ± tolerance
• Voltage - Clamping (Max) @ Ipp: 11.3V ± tolerance
• Current - Peak Pulse (10/1000µs): minimum 53A
• Power - Peak Pulse: minimum 600W
• Type: Zener, unidirectional

Mechanical Compatibility Criteria:

• Package / Case: DO-214AA or SMB equivalent
• Mounting Type: Surface Mount
• Operating Temperature Range: must support -55°C to 150°C minimum

Compliance Considerations:

• Product Status: Active preferred (obsolete parts have limited availability)
• RoHS Status: ROHS3 Compliant preferred for new designs
• Grade and Qualification: Automotive grade with AEC-Q101 qualification recommended for automotive applications

Substitute parts are grouped into two categories: Direct Equivalents (matching all key parameters within tolerance) and Similar Parts (meeting electrical requirements with minor parameter variations).

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Preferred for Drop-In Replacement):

P6SMB7.5A (Taiwan Semiconductor Corporation) is the primary direct equivalent. It maintains identical electrical specifications (6.4V reverse standoff, 11.3V clamping, 55A peak pulse current) with DO-214AA SMB package compatibility. This part is active in production with ROHS3 compliance, addressing the obsolescence and RoHS non-compliance issues of the original P6SMB7.5AT3.

Automotive-Grade Alternatives:

For applications requiring automotive qualification and AEC-Q101 certification, two options are available:

SM6T7V5AY (STMicroelectronics) provides automotive-grade protection with AEC-Q101 qualification. This part operates across the required temperature range with identical reverse standoff and breakdown voltages. The clamping voltage is 14.5V, which is higher than the original specification but remains within acceptable transient suppression parameters for most applications.

PTVS6V5P1UP,115 (NXP USA Inc., now Nexperia) offers automotive-grade AEC-Q101 qualification with 6.5V reverse standoff and 11.2V clamping voltage. This part uses SOD-128 package, which differs from the SMB package and requires PCB layout modification.

General-Purpose Active Alternatives:

SMBJP6KE7.5A-TP (Micro Commercial Co) matches the original specifications with 6.4V reverse standoff, 11.3V clamping, and 54A peak pulse current in SMB package. This part supports extended operating temperature to 175°C and is ROHS3 compliant.

TVP06B7V5A-G (Comchip Technology) provides equivalent electrical performance with 6.4V reverse standoff, 11.3V clamping, and 53.1A peak pulse current in SMB package. ROHS3 compliance and active product status support modern design requirements.

SMBJ6.5A (Taiwan Semiconductor Corporation) operates with 6.5V reverse standoff and 11.2V clamping voltage, representing a minor voltage shift suitable for applications with tolerance for ±0.1V variations.

Higher Power Alternative:

1KSMB7.5A (Littelfuse Inc.) provides enhanced transient suppression capability with 88.3A peak pulse current and 1000W peak pulse power (versus 600W in the original). This part is suitable for applications requiring increased transient energy absorption while maintaining the same voltage protection levels.

Compliance Considerations:

The original P6SMB7.5AT3 is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, supporting regulatory requirements for new designs and manufacturing. For automotive applications, SM6T7V5AY and PTVS6V5P1UP,115 maintain AEC-Q101 qualification, ensuring continued compliance with automotive supply chain requirements.

Frequently Asked Questions (FAQ)

Q: Can P6SMB7.5A directly replace P6SMB7.5AT3 without circuit modification?

A: Yes. P6SMB7.5A is a direct equivalent with identical electrical specifications (6.4V reverse standoff, 11.3V clamping, 55A peak pulse) and SMB package compatibility. No circuit or PCB layout changes are required.

Q: What is the difference between the clamping voltage of 11.3V in the original and 14.5V in SM6T7V5A?

A: The clamping voltage represents the maximum voltage across the TVS diode during transient suppression. A higher clamping voltage (14.5V) provides less aggressive voltage clamping but still protects circuits designed for the 11.3V specification. This is acceptable for most applications but should be verified against circuit protection requirements.

Q: Why does PTVS6V5P1UP,115 use SOD-128 package instead of SMB?

A: SOD-128 is a different surface mount package with different footprint and pin spacing. While electrically equivalent, this package requires PCB layout redesign. Use this part only if PCB modification is acceptable or if automotive AEC-Q101 qualification is mandatory.

Q: Is SMBJ6.5A compatible with circuits designed for 6.4V reverse standoff?

A: SMBJ6.5A operates at 6.5V reverse standoff versus 6.4V in the original. This 0.1V difference is within typical component tolerance and acceptable for most applications. However, verify compatibility with circuit protection thresholds if the application has tight voltage margins.

Q: What is the advantage of 1KSMB7.5A over other substitutes?

A: 1KSMB7.5A provides 1000W peak pulse power capacity versus 600W in the original and most substitutes. This higher power rating is beneficial for applications experiencing high-energy transient events. Peak pulse current is also higher at 88.3A, providing enhanced transient suppression capability.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts are ROHS3 compliant, addressing the RoHS non-compliance of the obsolete P6SMB7.5AT3. This compliance is essential for new designs and manufacturing in regulated markets.

Q: Which substitute is best for automotive applications?

A: SM6T7V5AY and PTVS6V5P1UP,115 both carry automotive grade designation and AEC-Q101 qualification. SM6T7V5AY is preferred for drop-in replacement due to SMB package compatibility. PTVS6V5P1UP,115 requires PCB modification due to SOD-128 package but offers NXP/Nexperia automotive supply chain support.

Q: Can I use multiple substitute parts interchangeably in inventory?

A: P6SMB7.5A, SMBJP6KE7.5A-TP, and TVP06B7V5A-G are interchangeable for most applications due to matching electrical specifications and SMB package. However, maintain separate inventory tracking for traceability and supply chain management. Mixing parts with different clamping voltages (such as SM6T7V5A at 14.5V) should be avoided unless circuit design explicitly permits voltage variation.