P6SMB24AT3G Equivalent & Substitute Parts

Part Overview

The P6SMB24AT3G is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This unidirectional Zener diode operates with a 20.5V reverse standoff voltage and provides 33.2V clamping at peak pulse current. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	20.5V
Voltage - Breakdown (Min)	22.8V
Voltage - Clamping (Max) @ Ipp	33.2V
Current - Peak Pulse (10/1000µs)	18A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Operating Temperature Range	-65°C ~ 150°C (TJ)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the P6SMB24AT3G is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Requirements:

Voltage - Reverse Standoff: 20.5V (exact match required)
Voltage - Breakdown (Min): 22.8V (exact match required)
Voltage - Clamping (Max) @ Ipp: 33.2V (exact match required)
Current - Peak Pulse (10/1000µs): minimum 18A
Power - Peak Pulse: minimum 600W

Mechanical Compatibility Requirements:

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

Compliance Requirements:

RoHS Status: ROHS3 Compliant or equivalent
Moisture Sensitivity Level: 1 (Unlimited)

Substitute parts are grouped into two categories: direct electrical equivalents with identical clamping voltage (33.2V) and enhanced performance alternatives with higher current ratings or power dissipation capabilities.

Parameter Comparison

Part Number	Manufacturer	VWM (V)	VBR Min (V)	VC Max (V)	Ipp (A)	Power (W)	Temp Range (°C)	Package	Status
P6SMB24AT3G	Littelfuse Inc.	20.5	22.8	33.2	18	600	-65 ~ 150	DO-214AA, SMB	Obsolete
P6SMB24A	Eaton - Electronics Division	20.5	22.8	33.2	18.4	600	-55 ~ 150	DO-214AA, SMB	Active
1KSMB24A	Taiwan Semiconductor Corporation	20.5	22.8	33.2	30.1	1000	-55 ~ 175	DO-214AA, SMB	Active
TPSMB24A	Littelfuse Inc.	20.5	22.8	33.2	18.4	600	-65 ~ 175	DO-214AA, SMB	Active
P6SMB24A-E3/52	Vishay General Semiconductor - Diodes Division	20.5	22.8	33.2	18.1	600	-65 ~ 150	DO-214AA, SMB	Active
P6SMB24A-M3/52	Vishay General Semiconductor - Diodes Division	20.5	22.8	33.2	18.1	600	-65 ~ 150	DO-214AA, SMB	Active
P6SMB24A-M3/5B	Vishay General Semiconductor - Diodes Division	20.5	22.8	33.2	18.1	600	-65 ~ 150	DO-214AA, SMB	Active
SM6T24A-M3/52	Vishay General Semiconductor - Diodes Division	20.5	22.8	33.2	18	600	-65 ~ 150	DO-214AA, SMB	Active
SM6T24A-M3/5B	Vishay General Semiconductor - Diodes Division	20.5	22.8	33.2	18	600	-65 ~ 150	DO-214AA, SMB	Active

Engineering Selection Recommendations

Direct Electrical Equivalents (Identical Specifications):

P6SMB24A (Eaton), P6SMB24A-E3/52 (Vishay), P6SMB24A-M3/52 (Vishay), P6SMB24A-M3/5B (Vishay), SM6T24A-M3/52 (Vishay), and SM6T24A-M3/5B (Vishay) provide direct substitution with matching voltage ratings, clamping characteristics, and 600W power dissipation. All are active products with ROHS3 compliance. Selection among these options depends on packaging preference (Tape & Reel vs. Tape & Box) and temperature range requirements. Vishay parts maintain the -65°C lower temperature limit matching the original specification.

Enhanced Performance Alternative:

1KSMB24A (Taiwan Semiconductor Corporation) offers superior current handling (30.1A vs. 18A) and power dissipation (1000W vs. 600W) while maintaining identical voltage characteristics. This part is suitable for applications requiring higher transient energy absorption. Extended operating temperature range (-55°C ~ 175°C) provides additional thermal margin.

Automotive-Grade Option:

TPSMB24A (Littelfuse Inc.) is qualified to AEC-Q101 automotive standards with extended upper temperature rating (-65°C ~ 175°C). This part is appropriate for automotive and harsh environment applications.

Frequently Asked Questions (FAQ)

Q: Can I use 1KSMB24A as a direct replacement for P6SMB24AT3G?

A: Yes. The 1KSMB24A maintains identical voltage specifications (20.5V standoff, 22.8V breakdown, 33.2V clamping) and exceeds the current and power requirements. The higher ratings provide additional design margin without affecting circuit operation.

Q: What is the difference between P6SMB24A and SM6T24A variants?

A: Both maintain identical electrical specifications for the P6SMB24AT3G application. The primary difference is manufacturer (Eaton vs. Vishay) and packaging options. Selection should be based on supply chain availability and packaging requirements (Tape & Reel vs. Tape & Box).

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the original P6SMB24AT3G specification.

Q: Does operating temperature range affect substitution suitability?

A: Operating temperature range does not affect electrical substitution if the application operates within the specified range. The P6SMB24AT3G operates -65°C ~ 150°C. Vishay P6SMB24A variants and TPSMB24A maintain this range. Eaton P6SMB24A operates -55°C ~ 150°C, which is acceptable if the application does not require operation below -55°C.

Q: What packaging options are available?

A: All substitute parts use DO-214AA (SMB) surface mount package. Packaging format options include Tape & Reel (TR) and Tape & Box (TB). Selection depends on manufacturing equipment and volume requirements.

Q: Is TPSMB24A suitable for general-purpose applications?

A: Yes. TPSMB24A is AEC-Q101 qualified for automotive use but is fully suitable for general-purpose applications. The automotive qualification provides additional quality assurance without restricting use in non-automotive designs.

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