1KSMB16 Equivalent & Substitute Parts

Part Overview

The 1KSMB16 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in surface-mount applications. This component features a 13.6V reverse standoff voltage and 23.63V maximum clamping voltage with 44.4A peak pulse current capability in a DO-214AA (SMB) package.

The 1KSMB16 is classified as obsolete. Equivalent and substitute parts are available from active manufacturers to maintain design continuity and ensure supply chain availability for new production and maintenance applications.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	13.6V
Voltage - Breakdown (Min)	14.4V
Voltage - Clamping (Max) @ Ipp	23.63V
Current - Peak Pulse (10/1000µs)	44.4A
Power - Peak Pulse	1000W
Operating Temperature Range	-55°C ~ 150°C (TJ)
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Type	Zener
Unidirectional Channels	1

Substitute Part Grouping Explanation

Substitute parts for the 1KSMB16 are qualified based on the following critical parameters:

Voltage Rating Match: Reverse standoff voltage of 13.6V and breakdown voltage minimum of 14.4V or higher
Clamping Voltage Compatibility: Maximum clamping voltage at Ipp between 22.5V and 23.63V
Peak Pulse Current: Minimum 27.1A capability (lower than original 44.4A represents reduced performance margin)
Package Compatibility: DO-214AA or SMB surface-mount package
Thermal Range: Operating temperature range of -55°C to 150°C or higher
Diode Type: Unidirectional Zener TVS configuration

The substitute parts listed below meet these core electrical and mechanical criteria, enabling direct replacement in circuit designs originally specified for the 1KSMB16.

Parameter Comparison

Parameter	1KSMB16 (Littelfuse)	1KSMB16A (Taiwan Semiconductor)	P6SMB16A (Eaton)	SMBJP6KE16A-TP (Micro Commercial)
Voltage - Reverse Standoff (Typ)	13.6V	13.6V	13.6V	13.6V
Voltage - Breakdown (Min)	14.4V	15.2V	15.2V	15.2V
Voltage - Clamping (Max) @ Ipp	23.63V	22.5V	22.5V	22.5V
Current - Peak Pulse (10/1000µs)	44.4A	44.4A	27.1A	27.1A
Power - Peak Pulse	1000W	1000W	600W	600W
Operating Temperature Range	-55°C ~ 150°C	-55°C ~ 175°C	-55°C ~ 150°C	-55°C ~ 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	RoHS Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: 1KSMB16A (Taiwan Semiconductor Corporation)

The 1KSMB16A is the closest electrical equivalent to the 1KSMB16. It maintains identical peak pulse current (44.4A) and power dissipation (1000W), with marginally lower clamping voltage (22.5V vs. 23.63V). This part is active in production, ROHS3 compliant, and offers an extended operating temperature range to 175°C. Tape & Reel packaging ensures compatibility with automated assembly processes.

Secondary Substitute: SMBJP6KE16A-TP (Micro Commercial Co)

The SMBJP6KE16A-TP provides equivalent voltage protection with reduced peak pulse current (27.1A) and power dissipation (600W). This part is suitable for applications where the original 44.4A specification exceeds circuit requirements. It is active in production, ROHS3 compliant, and rated to 175°C. The SMBJ package variant is mechanically compatible with standard SMB footprints.

Tertiary Substitute: P6SMB16A (Eaton - Electronics Division)

The P6SMB16A offers the same voltage protection parameters as the SMBJP6KE16A-TP with reduced current and power ratings (27.1A, 600W). This part is active in production and RoHS compliant. It is specified for telecom applications and maintains the -55°C to 150°C operating range. High inventory availability supports rapid procurement.

Frequently Asked Questions (FAQ)

Q: Can the 1KSMB16A directly replace the 1KSMB16 without circuit modification?

A: Yes. The 1KSMB16A maintains the same reverse standoff voltage (13.6V), identical peak pulse current (44.4A), and equivalent power dissipation (1000W). The clamping voltage is marginally lower (22.5V vs. 23.63V), which is within acceptable tolerance for most general-purpose transient suppression circuits. Both parts use the DO-214AA (SMB) package.

Q: What is the difference between the 1KSMB16A and the P6SMB16A or SMBJP6KE16A-TP?

A: The 1KSMB16A maintains the original 44.4A peak pulse current specification. The P6SMB16A and SMBJP6KE16A-TP both feature reduced peak pulse current (27.1A) and power dissipation (600W). These lower-rated parts are suitable only for applications where transient energy is limited and the original 1000W specification is not required.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All substitute parts use the DO-214AA or SMB surface-mount package, which share identical mechanical dimensions and land patterns. No PCB redesign is required for substitution.

Q: What compliance certifications apply to these substitute parts?

A: The 1KSMB16A and SMBJP6KE16A-TP are ROHS3 compliant. The P6SMB16A is RoHS compliant. All parts are rated EAR99 for export control and carry HTSUS code 8541.10.0080. The 1KSMB16A and SMBJP6KE16A-TP include REACH Unaffected status.

Q: Which substitute part offers the widest operating temperature range?

A: Both the 1KSMB16A and SMBJP6KE16A-TP are rated to -55°C ~ 175°C, extending 25°C above the original 1KSMB16 specification of -55°C ~ 150°C. The P6SMB16A maintains the original -55°C ~ 150°C range.

Q: Is the 1KSMB16 still available for purchase?

A: The 1KSMB16 is classified as obsolete. Active substitute parts from Taiwan Semiconductor Corporation, Eaton, and Micro Commercial Co are recommended for new designs and ongoing production requirements.

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