1KSMB22 Equivalent & Substitute Parts

Part Overview

The 1KSMB22 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in surface-mount applications. This component features an 18.8V reverse standoff voltage, 32.13V maximum clamping voltage, and 1000W peak pulse power rating in a DO-214AA (SMB) package. The part is currently listed as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	18.8	V
Voltage - Breakdown (Min)	19.8	V
Voltage - Clamping (Max) @ Ipp	32.13	V
Current - Peak Pulse (10/1000µs)	32.7	A
Power - Peak Pulse	1000	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AA, SMB	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the 1KSMB22 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 18.8V
Voltage - Clamping (Max) @ Ipp: Must remain within acceptable circuit tolerance
Current - Peak Pulse (10/1000µs): Minimum 20A required for equivalent protection
Package / Case: DO-214AA (SMB) surface-mount form factor
Type: Unidirectional Zener diode
RoHS3 Compliance: Required for regulatory alignment

The substitute parts listed below maintain the core voltage standoff specification and package compatibility. Variations in clamping voltage and peak pulse current reflect different manufacturer implementations within the 22V class TVS diode category.

Parameter Comparison

Parameter	1KSMB22 (Littelfuse)	1KSMB22A (Taiwan Semiconductor)	SM6T22A-E3/52 (Vishay)	SMBJP6KE22A-TP (Micro Commercial)
Voltage - Reverse Standoff (Typ)	18.8V	18.8V	18.8V	18.8V
Voltage - Breakdown (Min)	19.8V	20.9V	20.9V	20.9V
Voltage - Clamping (Max) @ Ipp	32.13V	30.6V	30.6V	30.6V
Current - Peak Pulse (10/1000µs)	32.7A	32.7A	20A	19.9A
Power - Peak Pulse	1000W	1000W	600W	600W
Operating Temperature Range	-55 to 150°C	-55 to 175°C	-65 to 150°C	-55 to 175°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

1KSMB22A (Taiwan Semiconductor Corporation) is the primary direct substitute. It maintains identical voltage standoff and peak pulse current specifications (32.7A, 1000W) while offering active product status and extended operating temperature range (-55 to 175°C). This part provides the closest electrical equivalence to the obsolete 1KSMB22.

SM6T22A-E3/52 (Vishay General Semiconductor) is a manufacturer-recommended alternative with active status and REACH compliance. This part operates within the same voltage class but with reduced peak pulse current (20A) and power rating (600W). Selection of this part requires circuit analysis to confirm that the lower current and power ratings are acceptable for the intended application.

SMBJP6KE22A-TP (Micro Commercial Co) is a manufacturer-recommended alternative with active status and extended operating temperature range (-55 to 175°C). Like the Vishay option, this part features reduced peak pulse current (19.9A) and power rating (600W), requiring application-level verification.

All substitute parts are RoHS3 compliant and maintain the DO-214AA (SMB) surface-mount package, ensuring mechanical and thermal compatibility with existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can the 1KSMB22A directly replace the 1KSMB22 without circuit modification?

A: Yes. The 1KSMB22A maintains identical voltage standoff (18.8V), breakdown voltage (20.9V minimum), peak pulse current (32.7A), and power rating (1000W). The DO-214AA package is mechanically and thermally compatible. No circuit redesign is required.

Q: What is the key difference between the 1KSMB22A and the Vishay SM6T22A-E3/52?

A: The primary difference is peak pulse current and power rating. The 1KSMB22A supports 32.7A and 1000W, while the SM6T22A-E3/52 supports 20A and 600W. Both maintain the same 18.8V standoff voltage and 30.6V clamping voltage. Selection depends on whether the circuit requires the higher current capacity.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (1KSMB22A, SM6T22A-E3/52, and SMBJP6KE22A-TP) are RoHS3 compliant, meeting current regulatory requirements for electronic components.

Q: Can the Vishay SM6T22A-E3/52 or Micro Commercial SMBJP6KE22A-TP be used in high-current transient suppression applications?

A: These parts are rated for 20A and 19.9A peak pulse current respectively, compared to 32.7A for the 1KSMB22A. Application suitability depends on the actual transient current magnitude in the circuit. Lower-rated parts may not provide adequate protection in high-energy surge events.

Q: What is the operating temperature difference between substitutes?

A: The 1KSMB22 operates from -55 to 150°C. The 1KSMB22A and SMBJP6KE22A-TP extend to -55 to 175°C. The SM6T22A-E3/52 operates from -65 to 150°C. Selection should account for the thermal environment of the application.

Q: Are all substitute parts available in Tape & Reel (TR) packaging?

A: Yes. The 1KSMB22A, SM6T22A-E3/52, and SMBJP6KE22A-TP are all supplied in Tape & Reel packaging, suitable for automated assembly processes.

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