P6SMB20AT3 Equivalent & Substitute Parts

Part Overview

The P6SMB20AT3 is a unidirectional transient voltage suppressor (TVS) diode manufactured by onsemi, rated for 600W peak pulse power with a 20V clamping specification. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives from active product lines. TVS diodes in this category are used for transient voltage protection in telecom and general-purpose applications where surge suppression is required on signal and power lines.

Key Parameters

Parameter	P6SMB20AT3
Manufacturer	onsemi
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Power - Peak Pulse	600W
Mounting Type	Surface Mount
Package / Case	SMB (DO-214AA)
Operating Temperature	-55°C ~ 150°C
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the P6SMB20AT3 is determined by the following critical parameters:

Unidirectional topology: All substitutes must be single-channel (1) unidirectional TVS diodes
Power rating: All substitutes must maintain 600W peak pulse power capability
Package type: Surface mount SMB (DO-214AA) or equivalent compact surface mount packages
Operating temperature range: Must support -55°C to 150°C minimum
Voltage class: Reverse standoff voltage in the 15V–17V range with clamping voltages between 27V–32.5V
Mounting compatibility: Surface mount technology for direct PCB integration

The identified substitutes meet these criteria while offering active product status and improved compliance profiles compared to the obsolete P6SMB20AT3.

Parameter Comparison

Parameter	P6SMB20AT3	P6SMB20A	PTVS17VP1UP,115	SM6T18A	SMBJ17A
Manufacturer	onsemi	Eaton - Electronics Division	NXP USA Inc.	STMicroelectronics	Meritek
Type	Zener	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1	1
Voltage - Reverse Standoff (Typ)	—	17.1V	17V	15.3V	17V
Voltage - Clamping (Max) @ Ipp	—	27.7V	27.6V	32.5V	27.6V
Current - Peak Pulse (10/1000µs)	—	21.7A	21.7A	123A (8/20µs)	21.74A
Power - Peak Pulse	600W	600W	600W	600W	600W
Package / Case	SMB (DO-214AA)	SMB (DO-214AA)	SOD-128	SMB (DO-214AA)	SMB (DO-214AA)
Operating Temperature	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	RoHS Compliant	—	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

P6SMB20A (Eaton - Electronics Division): This part offers the closest electrical match with 17.1V reverse standoff and 27.7V clamping voltage. It maintains SMB package compatibility and achieves RoHS compliance. Active product status ensures long-term availability and supply chain stability.

PTVS17VP1UP,115 (NXP USA Inc.): This alternative provides equivalent electrical performance with 17V reverse standoff and 27.6V clamping. It carries AEC-Q101 automotive qualification and is available in high inventory. Package differs as SOD-128 instead of SMB; PCB layout modification is required.

SM6T18A (STMicroelectronics): This part operates in a lower voltage class (15.3V reverse standoff) with higher clamping voltage (32.5V) and significantly higher peak pulse current (123A at 8/20µs). It maintains SMB package compatibility and ROHS3 compliance. Selection depends on circuit tolerance for higher clamping voltage.

SMBJ17A (Meritek): This option matches the voltage profile closely (17V reverse standoff, 27.6V clamping) with SMB package compatibility and ROHS3 compliance. Active status and high inventory availability support procurement flexibility.

Selection should prioritize parts with active product status and compliance certifications matching your application requirements. Package compatibility with existing PCB layouts is a primary consideration for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can the P6SMB20AT3 be directly replaced with any of these substitutes?

A: Direct replacement depends on package compatibility. P6SMB20A, SM6T18A, and SMBJ17A use SMB (DO-214AA) packaging and can be directly substituted on existing PCBs. PTVS17VP1UP,115 uses SOD-128 packaging and requires PCB layout modification.

Q: What is the primary difference between these substitute options?

A: The main differences are voltage clamping levels and peak pulse current ratings. P6SMB20A, PTVS17VP1UP,115, and SMBJ17A cluster around 27V clamping with 21.7A peak pulse current. SM6T18A operates at higher clamping voltage (32.5V) with significantly higher peak pulse current (123A). Selection depends on your circuit's voltage tolerance and transient current requirements.

Q: Are all substitutes RoHS compliant?

A: P6SMB20A, SM6T18A, and SMBJ17A are RoHS compliant (RoHS or ROHS3). The original P6SMB20AT3 is RoHS non-compliant. PTVS17VP1UP,115 RoHS status is not specified in available data.

Q: Which substitute offers the best long-term availability?

A: All identified substitutes carry active product status. PTVS17VP1UP,115 shows the highest inventory level (61,309 pcs), followed by P6SMB20A (5,087 pcs). Active status across all options supports sustained procurement.

Q: Does operating temperature range differ among substitutes?

A: All substitutes maintain the -55°C to 150°C operating temperature range, matching the original P6SMB20AT3 specification.

Q: What certifications should I consider for automotive applications?

A: PTVS17VP1UP,115 carries AEC-Q101 automotive qualification. If automotive-grade components are required, this part is the specified option among the substitutes listed.

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