P6SMB27AT3G Equivalent & Substitute Parts

Part Overview

The P6SMB27AT3G is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface mount applications. This component features a 23.1V reverse standoff voltage with 37.5V maximum clamping voltage and 16A peak pulse current capability in the SMB (DO-214AA) package. The part is currently listed as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	P6SMB27AT3G
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	23.1V
Voltage - Breakdown (Min)	25.7V
Voltage - Clamping (Max) @ Ipp	37.5V
Current - Peak Pulse (10/1000µs)	16A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature	-65°C ~ 150°C (TJ)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the P6SMB27AT3G is determined by strict electrical and mechanical parameter matching within the TVS diode category. The critical parameters governing substitution are:

Electrical Parameters:

Voltage - Reverse Standoff (Typ): 23.1V
Voltage - Breakdown (Min): 25.7V
Voltage - Clamping (Max) @ Ipp: 37.5V
Current - Peak Pulse (10/1000µs): 16A minimum
Power - Peak Pulse: 600W minimum

Mechanical Parameters:

Package / Case: DO-214AA (SMB)
Mounting Type: Surface Mount
Unidirectional Channels: 1

Substitute parts are grouped into two categories based on these parameters:

Group 1 - Direct Electrical Equivalents (37.5V Clamping): Parts maintaining identical clamping voltage (37.5V) and comparable peak pulse current ratings (16A–26.7A). These include 1KSMB27A, P6SMB27A (Eaton), P6SMB27A_R1_00001 (Panjit), and SMBJP6KE27A-TP.

Group 2 - Higher Performance Variants (48.3V Clamping): Parts with elevated clamping voltage (48.3V) and significantly higher peak pulse current (83A at 8/20µs). These include SM6T27A and SM6T27AY, suitable for applications requiring enhanced transient suppression capability.

Group 3 - Lower Voltage Variant: SMBJ22A with 22V reverse standoff and 35.5V clamping voltage, applicable where slightly lower voltage thresholds are acceptable.

Parameter Comparison

Part Number	Manufacturer	VWM (Typ)	VBR (Min)	VC (Max)	Ipp (10/1000µs)	Power	Package	Status	Temp Range
P6SMB27AT3G	Littelfuse Inc.	23.1V	25.7V	37.5V	16A	600W	DO-214AA (SMB)	Obsolete	-65°C ~ 150°C
1KSMB27A	Taiwan Semiconductor Corporation	23.1V	25.7V	37.5V	26.7A	1000W	DO-214AA (SMB)	Active	-55°C ~ 175°C
P6SMB27A	Eaton - Electronics Division	23.1V	25.7V	37.5V	16.3A	600W	DO-214AA (SMB)	Active	-55°C ~ 150°C
SMBJ22A	Meritek	22V	24.4V	35.5V	16.9A	600W	DO-214AA (SMB)	Active	-55°C ~ 150°C
P6SMB27A_R1_00001	Panjit International Inc.	23.1V	25.7V	37.5V	16A	600W	DO-214AA (SMB)	Active	-55°C ~ 150°C
SM6T27A	STMicroelectronics	23.1V	25.7V	48.3V	83A (8/20µs)	600W	DO-214AA (SMB)	Active	-55°C ~ 150°C
SM6T27AY	STMicroelectronics	23.1V	25.7V	48.3V	83A (8/20µs)	600W	DO-214AA (SMB)	Active	-55°C ~ 150°C
SMBJP6KE27A-TP	Micro Commercial Co	23.1V	25.7V	37.5V	16.3A	600W	DO-214AA (SMB)	Active	-55°C ~ 175°C

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

P6SMB27A (Eaton) and SMBJP6KE27A-TP (Micro Commercial Co) are the preferred direct replacements for P6SMB27AT3G. Both maintain identical electrical specifications (23.1V VWM, 37.5V clamping, 16.3A Ipp) and package configuration. Both are active products with ROHS3 compliance. P6SMB27A offers the largest inventory (20,140 units) and is qualified for telecom applications. SMBJP6KE27A-TP extends the upper operating temperature to 175°C, providing additional thermal margin in high-temperature environments.

P6SMB27A_R1_00001 (Panjit International Inc.) provides an alternative equivalent with identical electrical performance and active product status, suitable where supply chain diversification is required.

Secondary Substitute (Enhanced Performance):

1KSMB27A (Taiwan Semiconductor Corporation) maintains electrical equivalence while offering enhanced specifications: 26.7A peak pulse current and 1000W power dissipation versus the original 16A and 600W. This part is suitable for applications requiring higher transient energy absorption. Operating temperature range extends to 175°C. This substitution is valid where the circuit design can accommodate the higher performance characteristics without adverse effects.

Higher Performance Variants:

SM6T27A and SM6T27AY (STMicroelectronics) feature elevated clamping voltage (48.3V) and significantly higher peak pulse current (83A at 8/20µs). SM6T27AY includes automotive-grade qualification (AEC-Q101). These parts are suitable only for applications where the higher clamping voltage is acceptable and where enhanced transient suppression capability is beneficial.

Lower Voltage Alternative:

SMBJ22A (Meritek) operates at 22V reverse standoff with 35.5V clamping voltage. This part is suitable only for applications where the lower voltage threshold is compatible with circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can I use 1KSMB27A as a direct replacement for P6SMB27AT3G?

A: Yes. The 1KSMB27A maintains identical reverse standoff voltage (23.1V) and clamping voltage (37.5V). The higher peak pulse current (26.7A versus 16A) and power rating (1000W versus 600W) represent enhanced performance characteristics that do not compromise compatibility. The extended operating temperature range (-55°C to 175°C) provides additional thermal margin.

Q: What is the difference between P6SMB27A and SMBJP6KE27A-TP?

A: Both parts maintain identical electrical specifications (23.1V VWM, 37.5V clamping, 16.3A Ipp, 600W power). The primary difference is the upper operating temperature limit: P6SMB27A operates to 150°C while SMBJP6KE27A-TP extends to 175°C. Selection depends on the thermal environment of the application.

Q: Can SM6T27A replace P6SMB27AT3G?

A: SM6T27A is electrically compatible in terms of reverse standoff voltage (23.1V) and package (DO-214AA SMB). However, the clamping voltage is higher (48.3V versus 37.5V) and peak pulse current is significantly higher (83A versus 16A). This substitution is valid only if the circuit design can accommodate the higher clamping voltage without adverse effects on protected components.

Q: Why would I choose SMBJ22A over other substitutes?

A: SMBJ22A operates at a lower reverse standoff voltage (22V versus 23.1V) and lower clamping voltage (35.5V versus 37.5V). This part is suitable only for applications where these lower voltage thresholds are compatible with circuit protection requirements. It is not a general-purpose replacement for the P6SMB27AT3G.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the compliance status of the original P6SMB27AT3G.

Q: What is the significance of the SM6T27AY automotive qualification?

A: SM6T27AY carries AEC-Q101 automotive-grade qualification, indicating compliance with automotive industry reliability and quality standards. This part is suitable for automotive and mission-critical applications requiring enhanced qualification documentation. Non-automotive variants (SM6T27A) are suitable for general industrial and consumer applications.

Q: Do all substitutes use the same SMB package?

A: Yes. All listed substitute parts use the DO-214AA (SMB) surface mount package, ensuring mechanical and footprint compatibility with the original P6SMB27AT3G design.

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