1KSMB36 Equivalent & Substitute Parts

Part Overview

The 1KSMB36 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 30.8V reverse standoff voltage, 52.4V clamping voltage at peak pulse current, and 1000W peak pulse power rating in a DO-214AA (SMB) package. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs or production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	1KSMB36
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener, Unidirectional
Voltage - Reverse Standoff (Typ)	30.8V
Voltage - Clamping (Max) @ Ipp	52.4V
Current - Peak Pulse (10/1000µs)	20A
Power - Peak Pulse	1000W (1kW)
Operating Temperature Range	-55°C ~ 150°C (TJ)
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 1KSMB36 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 30.8V ±tolerance
Package / Case: DO-214AA, SMB (surface-mount compatibility)
Unidirectional Zener type configuration
RoHS3 compliance

Secondary Compatibility Factors:

Voltage - Clamping (Max) @ Ipp: 49.9V to 52.4V range
Current - Peak Pulse (10/1000µs): 12A to 20A
Power - Peak Pulse: 600W to 1000W
Operating Temperature Range: minimum -55°C, maximum 150°C or higher

Substitute parts are grouped into two categories: direct equivalents maintaining 20A peak pulse current and 1000W power rating, and functional alternatives with reduced current/power ratings (12A, 600W) suitable for applications with lower transient energy requirements.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package	Product Status
1KSMB36	Littelfuse Inc.	30.8V	52.4V	20A	1000W	-55°C ~ 150°C	DO-214AA, SMB	Obsolete
1KSMB36A	Taiwan Semiconductor Corporation	30.8V	49.9V	20A	1000W	-55°C ~ 175°C	DO-214AA, SMB	Active
1KSMB36AH	Taiwan Semiconductor Corporation	30.8V	49.9V	20A	1000W	-55°C ~ 175°C	DO-214AA, SMB	Active
1KSMB36A M4G	Taiwan Semiconductor Corporation	30.8V	49.9V	20A	1000W	-55°C ~ 175°C	DO-214AA, SMB	Active
P6SMB36	Taiwan Semiconductor Corporation	29.1V	52V	12A	600W	-55°C ~ 150°C	DO-214AA, SMB	Active
P6SMB36A	Eaton - Electronics Division	30.8V	49.9V	12.2A	600W	-55°C ~ 150°C	DO-214AA, SMB	Active
P6SMB36A R5G	Taiwan Semiconductor Corporation	30.8V	49.9V	12.6A	600W	-55°C ~ 150°C	DO-214AA, SMB	Discontinued at DiGi Electronics
P6SMB36A-E3/52	Vishay General Semiconductor - Diodes Division	30.8V	49.9V	12A	600W	-65°C ~ 150°C	DO-214AA, SMB	Active
SZP6SMB36AT3G	Littelfuse Inc.	30.8V	49.9V	12A	600W	-65°C ~ 150°C	DO-214AA, SMB	Active

Engineering Selection Recommendations

Direct Equivalents (1:1 Replacement): The 1KSMB36A, 1KSMB36AH, and 1KSMB36A M4G from Taiwan Semiconductor Corporation are direct functional equivalents. All three maintain the 20A peak pulse current and 1000W power rating, identical reverse standoff voltage of 30.8V, and DO-214AA SMB package compatibility. These parts are in active production status with extended operating temperature ranges (-55°C to 175°C) compared to the original 1KSMB36. All are ROHS3 compliant and REACH unaffected. The 1KSMB36AH and 1KSMB36A M4G variants include AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability.

Functional Alternatives (Reduced Power Rating): The P6SMB series components (P6SMB36, P6SMB36A, P6SMB36A R5G, P6SMB36A-E3/52) and SZP6SMB36AT3G provide equivalent voltage protection with reduced peak pulse current (12A to 12.6A) and power dissipation (600W). These alternatives are suitable for applications where transient energy levels are lower than the original 1kW specification. The P6SMB36A-E3/52 from Vishay and SZP6SMB36AT3G from Littelfuse offer extended temperature ranges (-65°C minimum), beneficial for harsh environment applications. All functional alternatives maintain ROHS3 compliance and active production status.

Compliance Considerations: All substitute parts listed are ROHS3 compliant. The 1KSMB36AH and 1KSMB36A M4G include AEC-Q101 automotive qualification. The P6SMB36A-E3/52 and SZP6SMB36AT3G provide extended low-temperature operation to -65°C. Selection should prioritize active production status parts (1KSMB36A variants and P6SMB series) over discontinued alternatives.

Frequently Asked Questions (FAQ)

Q: Can I use a P6SMB36A as a direct replacement for the 1KSMB36? A: The P6SMB36A is functionally compatible but with reduced specifications. It maintains the 30.8V reverse standoff voltage and DO-214AA SMB package, but provides 12.2A peak pulse current and 600W power rating versus the original 20A and 1000W. Use this substitute only if your application's transient energy requirements do not exceed 600W.

Q: What is the difference between 1KSMB36A, 1KSMB36AH, and 1KSMB36A M4G? A: All three are electrically identical with 30.8V standoff, 49.9V clamping, 20A peak pulse, and 1000W power rating. The 1KSMB36AH and 1KSMB36A M4G include AEC-Q101 automotive qualification and extended temperature range to 175°C. The M4G variant includes a specific packaging designation. Select based on automotive qualification requirements and packaging specifications.

Q: Are all substitute parts in the same package? A: Yes, all listed substitute parts use the DO-214AA SMB surface-mount package, ensuring mechanical and footprint compatibility. Mounting type is surface mount for all alternatives.

Q: Which substitute offers the best temperature performance? A: The P6SMB36A-E3/52 and SZP6SMB36AT3G both operate from -65°C to 150°C, providing 10°C lower minimum temperature than most alternatives. The 1KSMB36A variants extend the maximum to 175°C. Select based on your specific temperature environment requirements.

Q: Is the 1KSMB36A available in higher quantities than other substitutes? A: Yes, the 1KSMB36A from Taiwan Semiconductor Corporation has 30,300 pieces in stock, providing superior availability compared to other direct equivalents. The SZP6SMB36AT3G has 93,300 pieces available if the reduced power rating is acceptable.

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