1SMB22AT3 Equivalent & Substitute Parts

Part Overview

The 1SMB22AT3 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by onsemi in the DO-214AA (SMB) surface mount package. This component is designed for general-purpose transient voltage suppression applications with a 22V reverse standoff voltage and 35.5V maximum clamping voltage. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	1SMB22AT3
Manufacturer	onsemi
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	22V
Voltage - Breakdown (Min)	24.4V
Voltage - Clamping (Max) @ Ipp	35.5V
Current - Peak Pulse (10/1000µs)	16.9A
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	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the 1SMB22AT3 is determined by the following critical electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 22V
Voltage - Breakdown (Min): 24.4V
Voltage - Clamping (Max) @ Ipp: 35.5V
Current - Peak Pulse (10/1000µs): 16.9A
Power - Peak Pulse: 600W
Package / Case: DO-214AA (SMB)
Mounting Type: Surface Mount
Unidirectional Channels: 1

Substitute parts are grouped into two categories:

Direct Substitutes: Parts with identical electrical specifications (22V standoff, 24.4V breakdown, 35.5V clamping, 16.9A peak pulse, 600W peak power) in the same DO-214AA SMB package. These parts are functionally interchangeable without circuit modification.

Similar Substitutes: Parts with equivalent or near-equivalent electrical performance in the same package. The SACB22 operates at 14A peak pulse and 500W peak power, representing a lower current/power rating but maintaining the same voltage specifications and package form factor.

Parameter Comparison

Parameter	1SMB22AT3 (onsemi)	SMBJ22A (Meritek)	SACB22 (Littelfuse)	SMBJ22A-13-F (Diodes Inc.)	SMBJ22A-HR (Littelfuse)	SMBJ22A-HRA (Littelfuse)	SMBJ22A-M3/52 (Vishay)	SMBJ22A-M3/5B (Vishay)	SMBJ22A-TP (MCC)
Voltage - Reverse Standoff (Typ)	22V	22V	22V	22V	22V	22V	22V	22V	22V
Voltage - Breakdown (Min)	24.4V	24.4V	24.4V	24.4V	24.4V	24.4V	24.4V	24.4V	24.4V
Voltage - Clamping (Max) @ Ipp	35.5V	35.5V	35.4V	35.5V	35.5V	35.5V	35.5V	35.5V	35.5V
Current - Peak Pulse (10/1000µs)	16.9A	16.9A	14A	16.9A	16.9A	16.9A	16.9A	16.9A	16.9A
Power - Peak Pulse	600W	600W	500W	600W	600W	600W	600W	600W	600W
Package / Case	DO-214AA, SMB	DO-214AA (SMB)	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 175°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts listed are active products with ROHS3 compliance, addressing the obsolescence and RoHS non-compliance status of the 1SMB22AT3.

Direct Electrical Equivalents (600W, 16.9A): SMBJ22A (Meritek), SMBJ22A-13-F (Diodes Incorporated), SMBJ22A-HR (Littelfuse), SMBJ22A-HRA (Littelfuse), SMBJ22A-M3/52 (Vishay), SMBJ22A-M3/5B (Vishay), and SMBJ22A-TP (Micro Commercial Co) provide identical electrical performance with full RoHS3 compliance and active product status.

Lower Power Alternative: SACB22 (Littelfuse) maintains voltage specifications and package compatibility but operates at 14A peak pulse and 500W peak power. This part is suitable for applications where the lower current/power rating is acceptable.

Temperature Range Consideration: SMBJ22A-TP (Micro Commercial Co) extends the upper operating temperature to 175°C, compared to 150°C for most alternatives. SMBJ22A-HR, SMBJ22A-HRA, and the original 1SMB22AT3 support the lower temperature limit of -65°C; other substitutes operate from -55°C.

Frequently Asked Questions (FAQ)

Q: Can SMBJ22A (Meritek) directly replace 1SMB22AT3 in existing designs?

A: Yes. SMBJ22A matches all critical electrical parameters: 22V reverse standoff, 24.4V breakdown, 35.5V clamping, 16.9A peak pulse, and 600W peak power. Both use the DO-214AA (SMB) package. The part is active and RoHS3 compliant.

Q: What is the difference between SMBJ22A-HR and SMBJ22A-HRA?

A: Both parts are manufactured by Littelfuse with identical electrical specifications and operating temperature range (-65°C ~ 150°C). The suffix designations indicate different packaging or internal manufacturing variants, but electrical performance is equivalent.

**Q: Is SAC

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