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

Part Overview

The P6SMB7.5C is a surface mount transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general purpose overvoltage protection applications. This component operates with a 6.4V reverse standoff voltage and provides 11.87V maximum clamping voltage at peak pulse current. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for ongoing production and field replacement requirements.

Key Parameters

Parameter	Value
Reverse Standoff Voltage (Typ)	6.4V
Voltage - Breakdown (Min)	6.75V
Voltage - Clamping (Max) @ Ipp	11.87V
Current - Peak Pulse (10/1000µs)	54A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature Range	-55°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the P6SMB7.5C is determined by strict alignment of the following electrical and mechanical parameters:

Reverse Standoff Voltage: 6.4V (Typ)
Package / Case: DO-214AA, SMB (surface mount)
Mounting Type: Surface Mount
Power - Peak Pulse: 600W
Bidirectional Channels: 1
Type: Zener
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Substitute parts must maintain these core specifications. Variations in clamping voltage (within the 11.3V to 14.5V range), peak pulse current (53A to 276A), and operating temperature ranges are permissible based on application requirements, provided the reverse standoff voltage and package type remain constant.

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max @ Ipp (V)	Peak Pulse Current	Package	Product Status	Operating Temp (°C)
P6SMB7.5C	Littelfuse Inc.	6.4	6.75	11.87	54A	DO-214AA, SMB	Obsolete	-55 ~ 150
P6SMB7.5CA	Taiwan Semiconductor Corporation	6.4	7.13	11.3	55A	DO-214AA, SMB	Active	-55 ~ 150
SM6T7V5CA	STMicroelectronics	6.4	7.13	14.5	276A (8/20µs)	DO-214AA, SMB	Active	-55 ~ 150
SM6T7V5CA-E3/52	Vishay General Semiconductor - Diodes Division	6.4	7.13	11.3	53A	DO-214AA, SMB	Active	-65 ~ 150
SM6T7V5CA-E3/5B	Vishay General Semiconductor - Diodes Division	6.4	7.13	11.3	53A	DO-214AA, SMB	Active	-65 ~ 150
SM6T7V5CAY	STMicroelectronics	6.4	7.13	14.5	276A (8/20µs)	DO-214AA, SMB	Active	-55 ~ 150
SMBJP6KE7.5CA-TP	Micro Commercial Co	6.4	7.13	11.3	54A	DO-214AA, SMB	Active	-55 ~ 175

Engineering Selection Recommendations

All identified substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited) classification, ensuring regulatory and environmental compatibility with the original P6SMB7.5C.

For direct electrical equivalence with minimal performance variation, P6SMB7.5CA (Taiwan Semiconductor Corporation) and SMBJP6KE7.5CA-TP (Micro Commercial Co) are primary selections, offering clamping voltages of 11.3V and peak pulse currents of 54-55A, closely matching the original specification.

SM6T7V5CA-E3/52 and SM6T7V5CA-E3/5B (Vishay General Semiconductor - Diodes Division) provide extended operating temperature range (-65°C to 150°C) compared to the original -55°C to 150°C specification, with equivalent clamping performance at 11.3V and 53A peak pulse current.

SM6T7V5CA and SM6T7V5CAY (STMicroelectronics) offer higher peak pulse current capability (276A at 8/20µs pulse) and elevated clamping voltage (14.5V), suitable for applications requiring enhanced transient suppression performance. SM6T7V5CAY includes automotive-grade qualification (AEC-Q101).

SMBJP6KE7.5CA-TP extends the upper operating temperature limit to 175°C, providing thermal margin for high-temperature environments.

Frequently Asked Questions (FAQ)

Q: Can P6SMB7.5CA directly replace P6SMB7.5C in existing designs?

A: Yes. P6SMB7.5CA maintains identical reverse standoff voltage (6.4V), package type (DO-214AA, SMB), and mounting configuration. The clamping voltage differential (11.3V vs. 11.87V) and peak pulse current increase (55A vs. 54A) fall within acceptable substitution parameters for general purpose overvoltage protection applications.

Q: What is the difference between SM6T7V5CA and SM6T7V5CAY?

A: Both parts share identical electrical specifications (6.4V standoff, 14.5V clamping, 276A peak pulse current) and package type. SM6T7V5CAY includes automotive-grade qualification (AEC-Q101) and is designated for automotive applications. Selection depends on application requirements and qualification mandates.

Q: Are the Vishay SM6T7V5CA-E3/52 and SM6T7V5CA-E3/5B parts interchangeable?

A: Yes. Both parts are electrically and mechanically identical, with the suffix designating different packaging or distribution channels. Both offer -65°C to 150°C operating temperature range, providing 10°C lower minimum temperature compared to the original P6SMB7.5C.

Q: Can I use SM6T7V5CA (14.5V clamping) instead of P6SMB7.5CA (11.3V clamping)?

A: Substitution is permissible only if the application circuit tolerates the higher clamping voltage. The elevated clamping voltage provides stronger transient suppression but may alter circuit behavior in voltage-sensitive applications. Verify circuit compatibility before implementation.

Q: Do all substitute parts maintain the same moisture sensitivity classification?

A: Yes. All identified substitutes maintain Moisture Sensitivity Level 1 (Unlimited), matching the original P6SMB7.5C specification. No additional moisture handling precautions are required during storage or assembly.

Q: What packaging options are available for these substitute parts?

A: All substitute parts are supplied in DO-214AA (SMB) surface mount package. Packaging formats vary by manufacturer and distributor: Tape & Reel (TR), Cut Tape (CT), and Digi-Reel® configurations are available. Verify packaging compatibility with assembly equipment before procurement.

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