P6SMB7.5AT3G Equivalent & Substitute Parts

Part Overview

The P6SMB7.5AT3G is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface mount applications. This part operates with a 6.4V reverse standoff voltage and provides 11.3V maximum clamping voltage at peak pulse current. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	P6SMB7.5AT3G
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	6.4V
Voltage - Breakdown (Min)	7.13V
Voltage - Clamping (Max) @ Ipp	11.3V
Current - Peak Pulse (10/1000µs)	53A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature	-65°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the P6SMB7.5AT3G is determined by the following critical parameters:

Voltage Rating: Reverse standoff voltage of 6.4V ± tolerance, breakdown voltage minimum of 7.13V, and clamping voltage maximum of 11.3V
Peak Pulse Current: Minimum 53A at 10/1000µs pulse width
Power Dissipation: 600W peak pulse power
Package: DO-214AA (SMB) surface mount form factor
Unidirectional Configuration: Single channel Zener diode
Temperature Range: Operating range of -55°C to 150°C minimum

Substitute parts are grouped into two categories:

Direct Equivalents maintain all critical electrical parameters within specification and use identical packaging. These parts are pin-compatible and functionally interchangeable.

Functional Alternatives meet the core voltage and current requirements but may differ in peak pulse current capacity, clamping voltage, or temperature range. These parts are suitable when the application does not require exact parameter matching.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package	Product Status
P6SMB7.5AT3G	Littelfuse Inc.	6.4V	11.3V	53A	600W	-65°C ~ 150°C	DO-214AA (SMB)	Obsolete
P6SMB7.5A	Taiwan Semiconductor Corporation	6.4V	11.3V	55A	600W	-55°C ~ 150°C	DO-214AA (SMB)	Active
1KSMB7.5A	Littelfuse Inc.	6.4V	11.3V	88.3A	1000W	-55°C ~ 150°C	DO-214AA (SMBJ)	Active
SM6T7V5A-E3/52	Vishay General Semiconductor - Diodes Division	6.4V	11.3V	53A	600W	-65°C ~ 150°C	DO-214AA (SMBJ)	Active
P6SMB7.5A-E3/5B	Vishay General Semiconductor - Diodes Division	6.4V	11.3V	53.1A	600W	-65°C ~ 150°C	DO-214AA (SMB)	Active
SM6T7V5A	STMicroelectronics	6.4V	14.5V	276A (8/20µs)	600W	-55°C ~ 150°C	DO-214AA (SMB)	Active
SM6T7V5AY	STMicroelectronics	6.4V	14.5V	276A (8/20µs)	600W	-55°C ~ 150°C	DO-214AA (SMB)	Active
SMBJ6.5A	Taiwan Semiconductor Corporation	6.5V	11.2V	56A	600W	-55°C ~ 150°C	DO-214AA (SMB)	Active
SMBJP6KE7.5A-TP	Micro Commercial Co	6.4V	11.3V	54A	600W	-55°C ~ 175°C	DO-214AA (SMBJ)	Active

Engineering Selection Recommendations

Primary Recommendation: P6SMB7.5A (Taiwan Semiconductor Corporation)

This part is the closest direct equivalent to the P6SMB7.5AT3G. It maintains identical voltage ratings (6.4V reverse standoff, 11.3V clamping) and equivalent peak pulse current (55A vs. 53A). The part is active and in high inventory (300,100 pcs). The only difference is the minimum operating temperature of -55°C versus the original -65°C. This part is suitable for applications where the lower temperature limit is acceptable.

Secondary Recommendation: P6SMB7.5A-E3/5B (Vishay General Semiconductor - Diodes Division)

This part provides an exact parameter match to the original P6SMB7.5AT3G, including the extended operating temperature range of -65°C to 150°C. Peak pulse current is 53.1A, matching the original specification. The part is active and ROHS3 compliant. Limited inventory (630 pcs) may affect availability.

Alternative for Higher Power Applications: 1KSMB7.5A (Littelfuse Inc.)

This part maintains the same voltage ratings but provides significantly higher peak pulse current (88.3A) and power dissipation (1000W vs. 600W). It is manufactured by the original supplier and is active. This option is suitable when the application requires enhanced transient protection capability.

Functional Alternative: SM6T7V5A-E3/52 (Vishay General Semiconductor - Diodes Division)

This part matches all critical electrical parameters of the original part (6.4V standoff, 11.3V clamping, 53A peak pulse current) and extends the operating temperature range to -65°C. It is active and ROHS3 compliant with adequate inventory (30,300 pcs).

Not Recommended: SM6T7V5A and SM6T7V5AY (STMicroelectronics)

These parts have a higher clamping voltage (14.5V vs. 11.3V) and significantly higher peak pulse current (276A vs. 53A). While they share the same reverse standoff voltage, the elevated clamping voltage may not be suitable for applications requiring precise voltage regulation at 11.3V. These parts are functional alternatives only for applications with different voltage protection requirements.

Not Recommended: SMBJ6.5A (Taiwan Semiconductor Corporation)

This part has a slightly higher reverse standoff voltage (6.5V vs. 6.4V) and lower clamping voltage (11.2V vs. 11.3V). The voltage deviation may affect circuit protection performance in applications with tight voltage specifications.

Frequently Asked Questions (FAQ)

Q: Can I use P6SMB7.5A as a direct replacement for P6SMB7.5AT3G?

A: Yes. The P6SMB7.5A maintains the same voltage ratings and equivalent peak pulse current. The primary difference is the minimum operating temperature (-55°C vs. -65°C). If your application operates above -55°C, this part is fully compatible.

Q: What is the difference between the SMB and SMBJ package designations?

A: Both SMB and SMBJ refer to the DO-214AA package form factor used for surface mount TVS diodes. The designations are manufacturer-specific naming conventions. Both packages are physically and electrically compatible for this application.

Q: Why do some substitute parts have higher peak pulse current ratings?

A: Higher peak pulse current ratings indicate greater transient protection capability. Parts like the 1KSMB7.5A (88.3A) and SM6T7V5A (276A) can suppress larger transient events. These are suitable when the application requires enhanced protection beyond the original 53A specification.

Q: Is the clamping voltage difference between 11.3V and 14.5V significant?

A: Yes. The clamping voltage determines the maximum voltage the TVS diode allows across the protected circuit during a transient event. A higher clamping voltage (14.5V) provides less aggressive protection. Use parts with 11.3V clamping voltage for applications requiring precise voltage regulation at this level.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, matching the compliance status of the original P6SMB7.5AT3G.

Q: What does "Obsolete" product status mean for the original part?

A: Obsolete status indicates the manufacturer has discontinued production. Substitute parts with "Active" status are currently manufactured and available for procurement, ensuring long-term supply chain reliability.

Q: Can I use SMBJP6KE7.5A-TP in applications requiring -65°C operation?

A: No. The SMBJP6KE7.5A-TP has a minimum operating temperature of -55°C. For applications requiring -65°C operation, use P6SMB7.5A-E3/5B or SM6T7V5A-E3/52.

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