1SMB150AT3 Equivalent & Substitute Parts

Part Overview

The 1SMB150AT3 is a unidirectional transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface mount applications. This component features a 150V reverse standoff voltage with a 243V maximum clamping voltage at 2.5A peak pulse current, housed in the DO-214AA (SMB) package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	150	V
Voltage - Breakdown (Min)	167	V
Voltage - Clamping (Max) @ Ipp	243	V
Current - Peak Pulse (10/1000µs)	2.5	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature	-65°C ~ 150°C	TJ
Unidirectional Channels	1	—
Applications	General Purpose	—

Substitute Part Grouping Explanation

Substitution for the 1SMB150AT3 is determined by strict equivalence across the following electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 150V
Voltage - Breakdown (Min): 167V
Voltage - Clamping (Max) @ Ipp: 243V
Current - Peak Pulse (10/1000µs): 2.5A
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Unidirectional Channels: 1

Direct equivalents maintain all electrical specifications and package requirements. Similar parts are listed where voltage or current parameters deviate but remain functionally compatible for general-purpose transient suppression applications.

Parameter Comparison

Part Number	Manufacturer	VWM (V)	V(BR) Min (V)	VC Max (V)	Ipp (A)	Package	Status	RoHS
1SMB150AT3	onsemi	150	167	243	2.5	DO-214AA, SMB	Obsolete	Non-compliant
SMBJ150A	MDD	150	167	243	2.5	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ150A-13-F	Diodes Incorporated	150	167	243	2.5	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ150A-TP	Micro Commercial Co	150	167	243	2.5	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ150AE3/TR13	Microchip Technology	150	167	243	2.5	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ150E3/TR13	Microchip Technology	150	167	268	2.2	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ120CA	Meritek	120	133	193	3.11	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ154A-TR	STMicroelectronics	154	171	246	2.4	DO-214AA, SMB	Active	ROHS3 Compliant

Engineering Selection Recommendations

For direct replacement of the obsolete 1SMB150AT3, select from the following active, RoHS3-compliant alternatives that maintain identical electrical specifications:

SMBJ150A (MDD), SMBJ150A-13-F (Diodes Incorporated), SMBJ150A-TP (Micro Commercial Co), and SMBJ150AE3/TR13 (Microchip Technology) are electrically equivalent with 150V standoff, 243V clamping, and 2.5A peak pulse current ratings.

SMBJ150E3/TR13 (Microchip Technology) maintains the 150V standoff voltage but exhibits a higher clamping voltage of 268V and reduced peak pulse current of 2.2A. This part is suitable where higher transient voltage tolerance is acceptable.

SMBJ154A-TR (STMicroelectronics) provides a near-equivalent alternative with 154V standoff, 246V clamping, and 2.4A peak pulse current, offering minimal deviation from original specifications.

SMBJ120CA (Meritek) operates at a lower voltage class (120V standoff, 193V clamping) with higher peak pulse current (3.11A) and is suitable only for applications with reduced voltage stress requirements.

All recommended substitutes are available in active production status with RoHS3 compliance, addressing the regulatory and supply chain limitations of the obsolete 1SMB150AT3.

Frequently Asked Questions (FAQ)

Q: Can SMBJ150E3/TR13 replace 1SMB150AT3 directly?

A: SMBJ150E3/TR13 maintains the 150V reverse standoff voltage and DO-214AA package but exhibits a 268V maximum clamping voltage compared to the original 243V specification. Peak pulse current is reduced to 2.2A from 2.5A. This part is compatible where the higher clamping voltage does not exceed downstream component ratings.

Q: What is the difference between tape & reel and bulk packaging options?

A: SMBJ150A-13-F, SMBJ150A-TP, SMBJ150AE3/TR13, and SMBJ150E3/TR13 are supplied in tape & reel (TR) packaging for automated assembly. SMBJ150A (MDD) is available in bulk form. Both packaging formats contain electrically identical components; selection depends on manufacturing process requirements.

Q: Is SMBJ120CA a suitable substitute?

A: SMBJ120CA operates at a lower voltage class (120V standoff versus 150V) and is not a direct equivalent. This part is suitable only for applications where the circuit operates at reduced voltage levels and does not require the full 150V protection threshold of the original design.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed are RoHS3 compliant. The original 1SMB150AT3 is RoHS non-compliant. Compliance with current environmental regulations is achieved through any of the recommended active alternatives.

Q: What is the temperature operating range difference?

A: The 1SMB150AT3 operates from -65°C to 150°C. SMBJ150A-TP extends the upper limit to 175°C. Most other substitutes operate within -55°C to 150°C. Verify application temperature requirements before final selection.

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