SMBJ36 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ36 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in surface-mount applications. The device features a 36V reverse standoff voltage with a 61.01V maximum clamping voltage and 10.4A peak pulse current capability in a DO-214AA (SMB) package. The SMBJ36 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Active alternatives from multiple manufacturers provide comparable electrical performance while maintaining compatibility with existing circuit designs.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	36	V
Voltage - Breakdown (Min)	37.89	V
Voltage - Clamping (Max) @ Ipp	61.01	V
Current - Peak Pulse (10/1000µs)	10.4	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ36 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): Must equal 36V
Voltage - Clamping (Max) @ Ipp: Must not exceed 61.01V (lower values acceptable)
Current - Peak Pulse (10/1000µs): Must meet or exceed 10.4A
Power - Peak Pulse: Must meet or exceed 600W
Package / Case: Must be DO-214AA or SMB equivalent
Mounting Type: Must be Surface Mount
RoHS Status: Must maintain ROHS3 Compliance

All substitute parts listed below satisfy these electrical and mechanical compatibility criteria. Variations in clamping voltage below the maximum threshold and peak pulse current above the minimum requirement are acceptable within the scope of transient voltage suppression applications.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Package	Product Status
SMBJ36	Littelfuse Inc.	36	37.89	61.01	10.4	600	-65 to 150	DO-214AA, SMB	Obsolete
SMBJ36A	EVVO Semi	36	40	58.1	10.4	600	-65 to 150	DO-214AC, SMA	Active
SM6T42AY	STMicroelectronics	36	40	76	52 (8/20µs)	600	-55 to 150	DO-214AA, SMB	Active
SMB10J36A-E3/52	Vishay General Semiconductor - Diodes Division	36	40	58.1	17.2	1000	-55 to 150	DO-214AA, SMB	Active
SMBJ36A-13-F	Diodes Incorporated	36	40	58.1	10.3	600	-55 to 150	DO-214AA, SMB	Active
SMBJ36A-TP	Micro Commercial Co	36	40	58.1	10.3	600	-55 to 175	DO-214AA, SMB	Active

Engineering Selection Recommendations

All listed substitute parts maintain ROHS3 compliance and are classified as active products, ensuring long-term availability and supply chain stability. Selection among these alternatives should be based on the following considerations:

Direct Electrical Equivalents: SMBJ36A-13-F (Diodes Incorporated) and SMBJ36A-TP (Micro Commercial Co) provide the closest electrical match to the original SMBJ36, with clamping voltages of 58.1V and peak pulse currents of 10.3A. Both maintain the 600W power rating and are available in DO-214AA (SMB) packaging.

Enhanced Performance Options: SMB10J36A-E3/52 (Vishay) and SM6T42AY (STMicroelectronics) offer higher peak pulse current ratings (17.2A and 52A respectively) and increased power dissipation capability (1000W and 600W), providing additional margin for transient protection in demanding applications.

Temperature Range Consideration: SMBJ36A-TP extends the upper operating temperature to 175°C, compared to 150°C for most alternatives, suitable for high-temperature environments.

Automotive Grade Option: SM6T42AY carries AEC-Q101 automotive qualification and is part of the TRANSIL™ series, appropriate for automotive and industrial applications requiring enhanced reliability standards.

Frequently Asked Questions (FAQ)

Q: Can SMBJ36A substitute for SMBJ36 in existing designs? A: Yes. SMBJ36A maintains the 36V reverse standoff voltage and 600W power rating with a lower clamping voltage (58.1V vs. 61.01V), providing equivalent or improved transient suppression performance. The DO-214AC (SMA) package is mechanically compatible with DO-214AA (SMB) footprints in most applications.

Q: What is the difference between the 10/1000µs and 8/20µs pulse specifications? A: These represent different test pulse waveforms. The 10/1000µs waveform (used by most SMBJ36 alternatives) simulates slower transient events, while the 8/20µs waveform (used by SM6T42AY) simulates faster, more severe transients. SM6T42AY's 52A rating at 8/20µs indicates superior performance under rapid transient conditions.

Q: Is the higher peak pulse current of SMB10J36A-E3/52 necessary? A: Higher peak pulse current provides additional design margin and protection headroom. If the original SMBJ36 design operated within specifications, the 10.3A to 10.4A alternatives are sufficient. Higher-rated devices are beneficial in applications with uncertain or variable transient severity.

Q: Are all substitute parts available in the same package? A: Most alternatives use DO-214AA (SMB) packaging identical to the original SMBJ36. SMBJ36A (EVVO Semi) uses DO-214AC (SMA), which is mechanically similar but has slightly different pin spacing. Verify PCB footprint compatibility before selection.

Q: Which substitute offers the best long-term availability? A: SMBJ36A-13-F (Diodes Incorporated) and SMBJ36A-TP (Micro Commercial Co) are high-volume production parts with extensive inventory levels (113,200 and 2,986 units respectively), ensuring stable supply chains for ongoing production.

Q: Do all substitutes maintain RoHS3 compliance? A: Yes. All listed substitute parts are ROHS3 compliant, meeting environmental and regulatory requirements equivalent to the original SMBJ36.

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