P6SMB75AT3G Equivalent & Substitute Parts

Part Overview

The P6SMB75AT3G 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 reverse standoff voltage of 64.1V and provides clamping at 103V with a peak pulse current of 5.8A. The P6SMB75AT3G is classified as obsolete, necessitating identification of active equivalent parts that maintain electrical and mechanical compatibility for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	64.1V
Voltage - Breakdown (Min)	71.3V
Voltage - Clamping (Max) @ Ipp	103V
Current - Peak Pulse (10/1000µs)	5.8A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Operating Temperature	-65°C ~ 150°C (TJ)
Type	Zener
Unidirectional Channels	1
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the P6SMB75AT3G is determined by the following critical electrical parameters:

Voltage - Reverse Standoff (Typ): 64.1V ± tolerance
Voltage - Clamping (Max) @ Ipp: 103V ± tolerance
Current - Peak Pulse (10/1000µs): 5.8A minimum
Power - Peak Pulse: 600W minimum
Package / Case: DO-214AA (SMB) surface mount
Type: Zener diode, unidirectional

Substitute parts must maintain equivalent voltage ratings and clamping characteristics within acceptable engineering tolerances. Peak pulse current and power dissipation must meet or exceed the original specification. All substitutes must be housed in the DO-214AA (SMB) package to ensure mechanical and thermal compatibility with existing PCB layouts.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Product Status
P6SMB75AT3G	Littelfuse Inc.	64.1V	71.3V	103V	5.8A	600W	-65°C ~ 150°C	Obsolete
1KSMB75A	Taiwan Semiconductor Corporation	64.1V	71.3V	103V	9.7A	1000W	-55°C ~ 175°C	Active
SMBJ64A	Meritek	64V	71.1V	103V	5.83A	600W	-55°C ~ 150°C	Active
SMBJ70A	MDD	70V	77.8V	113V	5.3A	600W	-50°C ~ 150°C	Active
P6SMB75A-E3/52	Vishay General Semiconductor - Diodes Division	64.1V	71.3V	103V	5.8A	600W	-65°C ~ 150°C	Active
SM6T68A	STMicroelectronics	58.1V	64.6V	121V	33A (8/20µs)	600W	-55°C ~ 150°C	Active
SM6T75AY	STMicroelectronics	64.1V	71.3V	134V	30A (8/20µs)	600W	-55°C ~ 150°C	Active
SMBJ58E3/TR13	Microchip Technology	58V	64.4V	103V	5.8A	600W	-65°C ~ 150°C	Active

Engineering Selection Recommendations

Primary Substitute: P6SMB75A-E3/52

The P6SMB75A-E3/52 from Vishay General Semiconductor - Diodes Division is the recommended direct replacement. This part maintains identical electrical specifications to the P6SMB75AT3G: 64.1V reverse standoff voltage, 103V clamping voltage, and 5.8A peak pulse current. The operating temperature range (-65°C ~ 150°C) matches the original specification. The part is active in production, ROHS3 compliant, and available in tape and reel packaging. This substitution requires no circuit redesign.

Secondary Substitute: SMBJ64A

The SMBJ64A from Meritek provides equivalent voltage protection with 64V reverse standoff and 103V clamping. Peak pulse current is 5.83A, meeting the 5.8A requirement. This part is active and ROHS3 compliant. Operating temperature range is -55°C ~ 150°C, which is narrower than the original but suitable for most applications.

Alternative Substitute: 1KSMB75A

The 1KSMB75A from Taiwan Semiconductor Corporation matches the original voltage specifications (64.1V standoff, 103V clamping) with enhanced performance: 9.7A peak pulse current and 1000W power dissipation. Operating temperature extends to 175°C. This part is suitable for applications requiring higher transient current handling or elevated temperature operation.

Not Recommended: SMBJ70A, SM6T68A, SM6T75AY, SMBJ58E3/TR13

These parts deviate from the original electrical specifications. SMBJ70A operates at 70V standoff with 113V clamping, outside the 64.1V specification. SM6T68A and SM6T75AY feature different clamping voltages (121V and 134V respectively) and higher peak pulse currents designed for different protection requirements. SMBJ58E3/TR13 operates at 58V standoff, below the 64.1V requirement. These parts are suitable only for applications with different voltage protection requirements.

Frequently Asked Questions (FAQ)

Q: Can I use SMBJ70A as a substitute for P6SMB75AT3G?

A: No. The SMBJ70A operates at 70V reverse standoff voltage, which exceeds the 64.1V specification of the P6SMB75AT3G. This higher voltage rating means the device will not trigger protection at the intended voltage threshold, compromising circuit protection.

Q: What is the difference between the 1KSMB75A and P6SMB75A-E3/52?

A: Both parts maintain the same voltage specifications (64.1V standoff, 103V clamping). The 1KSMB75A provides higher peak pulse current (9.7A vs. 5.8A) and power dissipation (1000W vs. 600W), making it suitable for circuits experiencing higher transient energy. The 1KSMB75A also operates to 175°C versus 150°C for the P6SMB75A-E3/52.

Q: Are all substitute parts available in DO-214AA (SMB) packaging?

A: Yes. All listed substitute parts are manufactured in the DO-214AA (SMB) surface mount package, ensuring mechanical compatibility with existing PCB layouts without requiring footprint modifications.

Q: Does the P6SMB75A-E3/52 require any circuit modifications?

A: No. The P6SMB75A-E3/52 is a direct electrical and mechanical equivalent to the P6SMB75AT3G. No circuit redesign or PCB layout changes are necessary.

Q: Why is the P6SMB75AT3G obsolete?

A: The P6SMB75AT3G is classified as obsolete by Littelfuse Inc. Active equivalent parts from other manufacturers provide equivalent or superior performance and are recommended for new designs and production continuity.

Q: Can I use SM6T75AY in place of P6SMB75AT3G?

A: No. While SM6T75AY matches the 64.1V reverse standoff voltage, its clamping voltage is 134V compared to the 103V specification of the P6SMB75AT3G. This higher clamping voltage provides different protection characteristics and is not suitable as a direct substitute.

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