SMLJ33A-TP Equivalent & Substitute Parts

Part Overview

The SMLJ33A-TP is a unidirectional transient voltage suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose overvoltage protection in surface-mount applications. This component operates with a 33V reverse standoff voltage and 53.3V maximum clamping voltage, delivering 56.2A peak pulse current with 3000W peak pulse power dissipation. The device is housed in a DO-214AB (SMC) package and is RoHS3 compliant with unlimited moisture sensitivity rating. Substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the DO-214AB package family.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	33	V
Voltage - Breakdown (Min)	36.7	V
Voltage - Clamping (Max) @ Ipp	53.3	V
Current - Peak Pulse (10/1000µs)	56.2	A
Power - Peak Pulse	3000	W
Package / Case	DO-214AB, SMC	—
Operating Temperature Range	-55 to 175	°C
RoHS Status	ROHS3 Compliant	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitute parts for the SMLJ33A-TP are classified into two categories based on electrical equivalence:

Direct Equivalents maintain identical electrical specifications: 33V reverse standoff voltage, 36.7V minimum breakdown voltage, 53.3V maximum clamping voltage, 56.2A to 56.3A peak pulse current, and 3000W peak pulse power. These parts are mechanically and electrically interchangeable within the same circuit application.

Higher-Power Variants feature increased peak pulse current (93.9A) and power dissipation (5000W) while maintaining the same voltage parameters (33V standoff, 53.3V clamping). These parts provide enhanced transient protection capability and are suitable for applications requiring greater energy absorption.

Lower-Power Variants deliver reduced peak pulse current (28.2A) and power dissipation (1500W) with identical voltage specifications. These parts are suitable for lower-energy transient environments.

All substitute parts are housed in DO-214AB (SMC) surface-mount packages and maintain RoHS3 compliance.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Package	RoHS Status
SMLJ33A-TP	Micro Commercial Co	33	53.3	56.2	3000	-55 to 175	DO-214AB, SMC	ROHS3
3SMC33A TR13 PBFREE	Central Semiconductor Corp	33	53.3	56.2	3000	-65 to 150	DO-214AB, SMC	ROHS3
SMDJ33A	Alpha & Omega Semiconductor Inc.	33	53.3	56.3	3000	-55 to 150	DO-214AB, SMC	ROHS3
5.0SMDJ33A	Taiwan Semiconductor Corporation	33	53.3	93.9	5000	-55 to 175	DO-214AB, SMC	ROHS3
5.0SMDJ33A-T7	Littelfuse Inc.	33	53.3	93.9	5000	-65 to 150	DO-214AB, SMC	ROHS3
SMCJ33A	MDD	33	53.3	28.2	1500	-50 to 150	DO-214AB, SMC	ROHS3
SMCJ33A-TR	STMicroelectronics	33	69.7	143	1500	-55 to 150	DO-214AB, SMC	ROHS3
SMDJ33A-T7	Littelfuse Inc.	33	53.3	56.3	3000	-65 to 150	DO-214AB, SMC	ROHS3
SMLJ33A	Bourns Inc.	33	53.3	56.2	3000	-55 to 150	DO-214AB, SMC	ROHS3

Engineering Selection Recommendations

Direct Electrical Equivalents (3SMC33A TR13 PBFREE, SMDJ33A, SMDJ33A-T7, SMLJ33A) are suitable for one-to-one replacement with the SMLJ33A-TP. These parts maintain identical voltage and current specifications with minor temperature range variations. All are RoHS3 compliant and active products.

Higher-Power Alternatives (5.0SMDJ33A, 5.0SMDJ33A-T7) provide increased transient energy absorption (5000W vs. 3000W) and higher peak pulse current (93.9A vs. 56.2A) while preserving voltage parameters. These are suitable for applications requiring enhanced overvoltage protection margins or higher transient stress environments.

Lower-Power Alternatives (SMCJ33A) deliver reduced power dissipation (1500W) and peak pulse current (28.2A). Selection of this part requires confirmation that circuit transient energy levels do not exceed 1500W.

Non-Equivalent Part (SMCJ33A-TR by STMicroelectronics) exhibits different clamping voltage (69.7V vs. 53.3V) and peak pulse current specification (143A at 8/20µs vs. 56.2A at 10/1000µs). This part is not electrically equivalent and is not recommended as a substitute.

All recommended substitute parts are housed in DO-214AB (SMC) packages, compatible with existing PCB footprints and assembly processes.

Frequently Asked Questions (FAQ)

Q: Can SMCJ33A-TR replace SMLJ33A-TP? A: No. SMCJ33A-TR has a maximum clamping voltage of 69.7V compared to 53.3V for SMLJ33A-TP. The different clamping voltage and peak pulse current specification (143A at 8/20µs) make this part electrically non-equivalent.

Q: What is the difference between direct equivalents and higher-power variants? A: Direct equivalents (3SMC33A TR13 PBFREE, SMDJ33A, SMLJ33A) maintain identical 56.2A to 56.3A peak pulse current and 3000W power dissipation. Higher-power variants (5.0SMDJ33A, 5.0SMDJ33A-T7) provide 93.9A peak pulse current and 5000W power dissipation, offering greater transient protection capability.

Q: Are all substitute parts in the same package? A: Yes. All substitute parts are housed in DO-214AB (SMC) surface-mount packages, ensuring mechanical compatibility with existing PCB designs.

Q: What is the operating temperature range difference? A: SMLJ33A-TP operates from -55°C to 175°C. Most substitute parts operate from -55°C to 150°C or -65°C to 150°C. Verify temperature requirements for your specific application.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts are RoHS3 compliant and suitable for applications requiring RoHS compliance.

Q: Can SMCJ33A (lower-power variant) be used in place of SMLJ33A-TP? A: SMCJ33A can be used only if circuit transient energy does not exceed 1500W. This part delivers 28.2A peak pulse current versus 56.2A for SMLJ33A-TP. Confirm transient specifications before substitution.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message