P6SMB24 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The P6SMB24 is a unidirectional transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component operates with a 20.5V reverse standoff voltage and provides 34.86V maximum clamping voltage at peak pulse current. The part is currently classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for ongoing system support and new designs.

Key Parameters

Parameter	Value
Manufacturer Part Number	P6SMB24
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	20.5V
Voltage - Breakdown (Min)	21.6V
Voltage - Clamping (Max) @ Ipp	34.86V
Current - Peak Pulse (10/1000µs)	18.4A
Power - Peak Pulse	600W
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	DO-214AA, SMB
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the P6SMB24 is determined by the following critical parameters:

Mandatory Matching Criteria:

Reverse Standoff Voltage: 20.5V (Typ)
Unidirectional configuration (1 channel)
Surface mount package: DO-214AA / SMB form factor
Peak pulse power rating: 600W
Operating temperature range compatibility: minimum -55°C to 150°C

Acceptable Variation Parameters:

Voltage - Breakdown (Min): 21.6V to 22.8V range
Voltage - Clamping (Max) @ Ipp: 33.2V to 42.8V range
Current - Peak Pulse (10/1000µs): 18A to 93A range

All substitute parts listed maintain the core electrical protection function while operating within the specified voltage and current parameters. Packaging variations (Cut Tape, Tape & Reel, or Digi-Reel) do not affect electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package	RoHS Status
P6SMB24	Littelfuse Inc.	Obsolete	20.5V	21.6V	34.86V	18.4A	600W	-55°C ~ 150°C	DO-214AA, SMB	ROHS3 Compliant
P6SMB24A	Eaton - Electronics Division	Active	20.5V	22.8V	33.2V	18.4A	600W	-55°C ~ 150°C	DO-214AA, SMB	RoHS Compliant
SM6T24A	STMicroelectronics	Active	20.5V	22.8V	42.8V	93A (8/20µs)	600W	-55°C ~ 150°C	DO-214AA, SMB	ROHS3 Compliant
SM6T24A-E3/52	Vishay General Semiconductor - Diodes Division	Active	20.5V	22.8V	33.2V	18A	600W	-65°C ~ 150°C	DO-214AA, SMB	ROHS3 Compliant
SM6T24A-E3/5B	Vishay General Semiconductor - Diodes Division	Active	20.5V	22.8V	33.2V	18A	600W	-65°C ~ 150°C	DO-214AA, SMB	ROHS3 Compliant
SM6T24AY	STMicroelectronics	Active	20.5V	22.8V	42.8V	93A (8/20µs)	600W	-55°C ~ 150°C	DO-214AA, SMB	ROHS3 Compliant
SMBJP6KE24A-TP	Micro Commercial Co	Active	20.5V	22.8V	33.2V	18.4A	600W	-55°C ~ 175°C	DO-214AA, SMB	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: P6SMB24A (Eaton - Electronics Division)

P6SMB24A is the direct manufacturer-recommended equivalent with active product status. It maintains identical reverse standoff voltage (20.5V), peak pulse power (600W), and operating temperature range (-55°C ~ 150°C). The clamping voltage specification (33.2V) and peak pulse current (18.4A) are within acceptable substitution parameters. RoHS compliance is confirmed. This part provides the closest electrical and mechanical match for direct replacement.

Secondary Recommendations: SM6T24A-E3/52 and SM6T24A-E3/5B (Vishay General Semiconductor)

Both Vishay variants maintain the 20.5V reverse standoff voltage and 600W power rating. The clamping voltage (33.2V) and peak pulse current (18A) are compatible. These parts offer extended operating temperature range (-65°C ~ 150°C), providing additional thermal margin. ROHS3 compliance and DO-214AA packaging ensure compatibility. Packaging options (Cut Tape vs. Tape & Reel) accommodate different procurement workflows.

Alternative Options: SM6T24A and SM6T24AY (STMicroelectronics)

Both STMicroelectronics parts maintain core electrical parameters (20.5V standoff, 600W power). These variants feature higher peak pulse current capability (93A at 8/20µs) and elevated clamping voltage (42.8V), providing enhanced transient suppression performance. SM6T24AY includes automotive-grade qualification (AEC-Q101), suitable for applications requiring automotive reliability standards. ROHS3 compliance confirmed.

Extended Temperature Option: SMBJP6KE24A-TP (Micro Commercial Co)

This part maintains 20.5V standoff voltage and 600W power rating with extended upper operating temperature limit (-55°C ~ 175°C). Peak pulse current (18.4A) and clamping voltage (33.2V) match the original specification. ROHS3 compliance and DO-214AA packaging provide full compatibility. This option is suitable for high-temperature applications.

Frequently Asked Questions (FAQ)

Q: Can I use SM6T24A or SM6T24AY as direct replacements for P6SMB24?

A: Yes. Both parts maintain the mandatory 20.5V reverse standoff voltage, 600W peak pulse power, and DO-214AA/SMB package format. The higher peak pulse current (93A vs. 18.4A) and clamping voltage (42.8V vs. 34.86V) represent enhanced performance characteristics within acceptable substitution parameters. These parts provide superior transient suppression capability.

Q: What is the difference between SM6T24A-E3/52 and SM6T24A-E3/5B?

A: Both parts are electrically identical with matching reverse standoff voltage (20.5V), clamping voltage (33.2V), and peak pulse current (18A). The difference is packaging format: SM6T24A-E3/52 is supplied in Cut Tape (CT) & Digi-Reel format, while SM6T24A-E3/5B is supplied in Tape & Reel (TR) format. Selection depends on procurement and assembly requirements.

Q: Is SM6T24AY suitable for automotive applications?

A: Yes. SM6T24AY carries automotive-grade qualification (AEC-Q101) and is classified as automotive-grade component. It maintains all electrical compatibility parameters with P6SMB24 while meeting automotive reliability standards.

Q: What is the temperature range difference between P6SMB24A and SM6T24A-E3/52?

A: P6SMB24A operates from -55°C to 150°C. SM6T24A-E3/52 operates from -65°C to 150°C, providing 10°C additional margin at the lower temperature limit. Both maintain the same upper temperature limit (150°C).

Q: Can SMBJP6KE24A-TP be used in high-temperature environments?

A: Yes. SMBJP6KE24A-TP operates from -55°C to 175°C, providing 25°C additional margin at the upper temperature limit compared to the original P6SMB24 (-55°C to 150°C). This makes it suitable for applications requiring extended high-temperature operation.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts carry RoHS compliance certification (ROHS3 or RoHS Compliant status), meeting environmental and regulatory requirements equivalent to the original P6SMB24.

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

A: All substitute parts use DO-214AA/SMB surface mount package format. Packaging supply formats vary: Cut Tape (CT), Tape & Reel (TR), or Digi-Reel. These format differences do not affect electrical compatibility and accommodate different procurement and assembly workflows.

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