P6SMB15C Equivalent & Substitute Parts

Part Overview

The P6SMB15C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional Zener diode features a 12.8V reverse standoff voltage and 22.26V maximum clamping voltage at peak pulse current. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage ratings, current handling, and thermal specifications while supporting the same DO-214AA (SMB) package format.

Key Parameters

Parameter	P6SMB15C	Unit
Voltage - Reverse Standoff (Typ)	12.8	V
Voltage - Breakdown (Min)	14.65	V
Voltage - Clamping (Max) @ Ipp	22.26	V
Current - Peak Pulse (10/1000µs)	28.8	A
Power - Peak Pulse	600	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Type	Zener	—
Bidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the P6SMB15C is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 12.8V
Voltage - Breakdown (Min): 14.65V or higher
Voltage - Clamping (Max) @ Ipp: 21.2V to 27.2V range
Current - Peak Pulse (10/1000µs): 28A or higher
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB (surface mount)
Operating Temperature: -55°C to 150°C minimum
Type: Zener, Bidirectional (1 channel)

Substitute parts are grouped into two categories based on clamping voltage performance:

Category A (Lower Clamping Voltage: 21.2V): P6SMB15CA, SZP6SMB15CAT3G, P6SMB15CA-M3/52, P6SMB15CA-M3/5B, SM6T15CA-E3/52, SM6T15CA-E3/5B, SMBJP6KE15CA-TP

Category B (Higher Clamping Voltage: 27.2V): SM6T15CA, SM6T15CAY

All substitute parts maintain the 12.8V reverse standoff voltage, 600W peak pulse power rating, and DO-214AA (SMB) package compatibility. Clamping voltage variations reflect different transient suppression characteristics within acceptable operating ranges for the 15V protection class.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown (Min) (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temperature (°C)	Package	Product Status
P6SMB15C	Littelfuse Inc.	12.8	14.65	22.26	28.8	600	-55 to 150	DO-214AA, SMB	Obsolete
P6SMB15CA	Eaton - Electronics Division	12.8	14.3	21.2	28.8	600	-55 to 150	DO-214AA, SMB	Active
SZP6SMB15CAT3G	Littelfuse Inc.	12.8	14.3	21.2	28	600	-65 to 150	DO-214AA, SMB	Active
P6SMB15CA-M3/52	Vishay General Semiconductor - Diodes Division	12.8	14.3	21.2	28.3	600	-65 to 150	DO-214AA, SMB	Active
P6SMB15CA-M3/5B	Vishay General Semiconductor - Diodes Division	12.8	14.3	21.2	28.3	600	-65 to 150	DO-214AA, SMB	Active
SM6T15CA	STMicroelectronics	12.8	14.3	27.2	147 (8/20µs)	600	-55 to 150	DO-214AA, SMB	Active
SM6T15CA-E3/52	Vishay General Semiconductor - Diodes Division	12.8	14.3	21.2	28	600	-65 to 150	DO-214AA, SMB	Active
SM6T15CA-E3/5B	Vishay General Semiconductor - Diodes Division	12.8	14.3	21.2	28	600	-65 to 150	DO-214AA, SMB	Active
SM6T15CAY	STMicroelectronics	12.8	14.3	27.2	147 (8/20µs)	600	-55 to 150	DO-214AA, SMB	Active
SMBJP6KE15CA-TP	Micro Commercial Co	12.8	14.3	21.2	28.8	600	-55 to 175	DO-214AA, SMB	Active

Engineering Selection Recommendations

All listed substitute parts are active products with current manufacturing support, eliminating obsolescence risk associated with the P6SMB15C. Selection between Category A (21.2V clamping) and Category B (27.2V clamping) depends on circuit protection requirements:

Category A substitutes (P6SMB15CA, SZP6SMB15CAT3G, P6SMB15CA-M3/52, P6SMB15CA-M3/5B, SM6T15CA-E3/52, SM6T15CA-E3/5B, SMBJP6KE15CA-TP) provide clamping voltage closer to the original P6SMB15C specification (22.26V) and are suitable for applications requiring tighter voltage control. P6SMB15CA from Eaton and SMBJP6KE15CA-TP from Micro Commercial Co maintain the original 28.8A peak pulse current rating. Vishay variants (P6SMB15CA-M3/52, P6SMB15CA-M3/5B, SM6T15CA-E3/52, SM6T15CA-E3/5B) extend operating temperature to -65°C and carry ROHS3 compliance. SZP6SMB15CAT3G from Littelfuse includes AEC-Q101 automotive qualification.

Category B substitutes (SM6T15CA, SM6T15CAY) from STMicroelectronics feature higher clamping voltage (27.2V) and significantly higher peak pulse current (147A at 8/20µs pulse), suitable for applications requiring enhanced transient suppression capability. SM6T15CAY carries AEC-Q101 automotive qualification and extends operating temperature to -55°C minimum.

All parts maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating. Temperature range selection should align with circuit operating requirements: standard -55°C to 150°C range or extended -65°C to 150°C range for Vishay variants.

Frequently Asked Questions (FAQ)

Q: Can P6SMB15CA directly replace P6SMB15C in existing designs?

A: Yes. P6SMB15CA maintains identical reverse standoff voltage (12.8V), peak pulse power (600W), and package format (DO-214AA, SMB). The clamping voltage is 21.2V versus the original 22.26V, representing a 4.8% reduction within acceptable tolerance for 15V protection class applications. Peak pulse current remains at 28.8A.

Q: What is the difference between Category A and Category B substitutes?

A: Category A parts (21.2V clamping) provide voltage suppression characteristics closer to the original P6SMB15C. Category B parts (SM6T15CA, SM6T15CAY) feature higher clamping voltage (27.2V) and substantially higher peak pulse current (147A), offering enhanced transient suppression for high-energy surge environments. Selection depends on circuit protection requirements and transient energy levels.

Q: Are Vishay variants (P6SMB15CA-M3/52, P6SMB15CA-M3/5B) compatible with standard -55°C to 150°C applications?

A: Yes. Vishay variants support -65°C to 150°C operating temperature, exceeding the original -55°C to 150°C specification. They are fully compatible with standard temperature range applications and provide additional margin for low-temperature operation.

Q: Which substitute offers the best compatibility with the original P6SMB15C?

A: P6SMB15CA from Eaton and SMBJP6KE15CA-TP from Micro Commercial Co maintain the original 28.8A peak pulse current rating and 600W power dissipation. Both are active products with established supply chains. SMBJP6KE15CA-TP extends operating temperature to 175°C, providing additional thermal margin.

Q: Do all substitutes support the same DO-214AA (SMB) package?

A: Yes. All listed substitutes use DO-214AA (SMB) surface-mount package format, ensuring mechanical and electrical compatibility with existing PCB layouts and reflow soldering processes.

Q: What is the significance of AEC-Q101 qualification on SZP6SMB15CAT3G and SM6T15CAY?

A: AEC-Q101 qualification indicates automotive-grade reliability testing and is required for automotive applications. SZP6SMB15CAT3G and SM6T15CAY meet this standard; other substitutes are suitable for general-purpose and telecom applications without automotive qualification.

Q: Can SM6T15CA or SM6T15CAY be used in place of Category A parts?

A: Yes, with circuit verification. The higher clamping voltage (27.2V) and peak pulse current (147A) provide enhanced protection but may alter circuit transient response. Applications sensitive to clamping voltage should be evaluated for compatibility.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message