1KSMBJ36A Equivalent & Substitute Parts

Part Overview

The 1KSMBJ36A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for telecom applications. This component features a 30.8V reverse standoff voltage with 49.9V maximum clamping voltage and 20A peak pulse current capability in a surface mount DO-214AA (SMBJ) package. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	30.8	V
Voltage - Breakdown (Min)	34.2	V
Voltage - Clamping (Max) @ Ipp	49.9	V
Current - Peak Pulse (10/1000µs)	20	A
Power - Peak Pulse	1000	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 1KSMBJ36A is determined by strict electrical and mechanical parameter matching:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 30.8V
Voltage - Breakdown (Min): 34.2V
Voltage - Clamping (Max) @ Ipp: 49.9V
Package / Case: DO-214AA, SMB (surface mount)
Unidirectional Channels: 1
Type: Zener

Acceptable Variation Parameters:

Current - Peak Pulse (10/1000µs): Substitute parts may have lower peak pulse current (12A or 12.2A) while maintaining the same voltage characteristics
Power - Peak Pulse: Substitute parts may have reduced power rating (600W) while maintaining voltage specifications
Operating Temperature Range: Substitute parts may have extended or equivalent temperature ranges

Substitute parts are grouped into two categories based on these criteria: direct electrical equivalents with identical voltage specifications and current ratings, and functional equivalents with reduced current/power ratings but identical voltage protection characteristics.

Parameter Comparison

Part Number	Manufacturer	VWM (Typ) V	VBR (Min) V	VC (Max) V	Ipp A	Power W	Temp Range °C	Package	Status
1KSMBJ36A	Littelfuse Inc.	30.8	34.2	49.9	20	1000	-55 to 150	DO-214AA (SMBJ)	Obsolete
1KSMB36A	Taiwan Semiconductor Corporation	30.8	34.2	49.9	20	1000	-55 to 175	DO-214AA (SMB)	Active
P6SMB36A	Eaton - Electronics Division	30.8	34.2	49.9	12.2	600	-55 to 150	DO-214AA, SMB	Active
SZP6SMB36AT3G	Littelfuse Inc.	30.8	34.2	49.9	12	600	-65 to 150	DO-214AA, SMB	Active
SM6T36A	STMicroelectronics	30.8	34.2	64.3	62 (8/20µs)	600	-55 to 150	DO-214AA, SMB	Active
SM6T36A-E3/52	Vishay General Semiconductor - Diodes Division	30.8	34.2	49.9	12	600	-65 to 150	DO-214AA (SMBJ)	Active
SM6T36A-E3/5B	Vishay General Semiconductor - Diodes Division	30.8	34.2	49.9	12	600	-65 to 150	DO-214AA (SMBJ)	Active
SM6T36AY	STMicroelectronics	30.8	34.2	64.3	62 (8/20µs)	600	-55 to 150	DO-214AA, SMB	Active
SMBJP6KE36A-TP	Micro Commercial Co	30.8	34.2	49.9	12.2	600	-55 to 175	DO-214AA (SMBJ)	Active

Engineering Selection Recommendations

Direct Electrical Equivalent (Preferred for 1:1 Replacement): The 1KSMB36A from Taiwan Semiconductor Corporation is the closest active equivalent, matching all electrical parameters (30.8V standoff, 49.9V clamping, 20A peak pulse, 1000W power) with an extended operating temperature range (-55 to 175°C). This part maintains ROHS3 compliance and is actively manufactured with high inventory availability.

Functional Equivalents with Reduced Current Rating: Parts including P6SMB36A (Eaton), SZP6SMB36AT3G (Littelfuse), SM6T36A-E3/52 (Vishay), SM6T36A-E3/5B (Vishay), and SMBJP6KE36A-TP (Micro Commercial Co) maintain identical voltage protection characteristics (30.8V standoff, 49.9V clamping) but with reduced peak pulse current (12A or 12.2A) and power dissipation (600W). These are suitable for applications where the full 20A peak pulse capability is not required. All maintain ROHS3 compliance and active product status.

Higher Clamping Voltage Variants: SM6T36A and SM6T36AY from STMicroelectronics feature higher clamping voltage (64.3V) with significantly higher peak pulse current (62A at 8/20µs pulse). These are not direct substitutes but represent alternative protection levels for different circuit requirements.

Compliance Considerations: All recommended substitute parts maintain ROHS3 compliance. SZP6SMB36AT3G includes AEC-Q101 automotive qualification and extended temperature range (-65 to 150°C). SM6T36AY includes AEC-Q101 automotive qualification. Selection should account for application-specific compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can 1KSMB36A directly replace 1KSMBJ36A? A: Yes. The 1KSMB36A maintains identical electrical specifications (30.8V standoff, 49.9V clamping, 20A peak pulse) and DO-214AA SMB package compatibility. The primary difference is extended operating temperature range (-55 to 175°C vs. -55 to 150°C) and active product status.

Q: What is the difference between parts with 20A and 12A peak pulse ratings? A: The 20A rating (1KSMBJ36A, 1KSMB36A) indicates higher transient current handling capability and 1000W peak power dissipation. The 12A/12.2A variants (P6SMB36A, SZP6SMB36AT3G, SM6T36A-E3/52, SM6T36A-E3/5B, SMBJP6KE36A-TP) provide identical voltage protection but with 600W peak power dissipation. Selection depends on circuit transient current requirements.

Q: Are SM6T36A and SM6T36AY suitable replacements? A: These parts maintain the 30.8V standoff voltage but feature higher clamping voltage (64.3V) and significantly higher peak pulse current (62A). They are not direct substitutes but represent alternative protection levels. Use only if circuit design permits higher clamping voltage.

Q: What packaging differences exist among substitute parts? A: All parts use DO-214AA SMB surface mount package. Variations include SMBJ designation (1KSMBJ36A, SM6T36A-E3/52, SM6T36A-E3/5B, SMBJP6KE36A-TP) and generic SMB designation (1KSMB36A, P6SMB36A, SZP6SMB36AT3G, SM6T36A, SM6T36AY). These designations reflect manufacturer conventions but do not affect mechanical compatibility.

Q: Which substitute offers the best availability? A: 1KSMB36A (Taiwan Semiconductor Corporation) and SZP6SMB36AT3G (Littelfuse) offer the highest inventory levels (30,300 and 93,300 pieces respectively) among active equivalents.

Q: Do substitute parts require design changes? A: Direct electrical equivalents (1KSMB36A, P6SMB36A, SZP6SMB36AT3G, SM6T36A-E3/52, SM6T36A-E3/5B, SMBJP6KE36A-TP) require no design changes. Higher clamping voltage variants (SM6T36A, SM6T36AY) may require circuit evaluation if clamping voltage tolerance is critical.

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