SMLJ150A Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMLJ150A is a unidirectional transient voltage suppressor diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection applications. This surface-mount component operates in the 150V reverse standoff voltage class with a 243V maximum clamping voltage and 12.4A peak pulse current capability. The part is active in production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity when the primary part becomes unavailable or when alternative performance characteristics better suit specific application requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	150	V
Voltage - Breakdown (Min)	167	V
Voltage - Clamping (Max) @ Ipp	243	V
Current - Peak Pulse (10/1000µs)	12.4	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitute parts for the SMLJ150A are classified based on electrical parameter compatibility within the 150V reverse standoff voltage class. The primary substitution criteria are:

Voltage - Reverse Standoff (Typ): 150V
Voltage - Clamping (Max) @ Ipp: 243V
Voltage - Breakdown (Min): 167V
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Unidirectional Channels: 1
Type: Zener

Substitute parts are grouped into two categories:

Direct Equivalents maintain identical electrical specifications including peak pulse current (12.4A) and peak pulse power (3000W).

Compatible Alternatives maintain voltage specifications but differ in peak pulse current and power ratings. These parts are electrically compatible for the same voltage protection class but provide different current handling capabilities.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Package	Product Status
SMLJ150A	Bourns Inc.	150	167	243	12.4	3000	-55 to 150	DO-214AB, SMC	Active
SMDJ150A	Alpha & Omega Semiconductor Inc.	150	167	243	12.4	3000	-55 to 150	DO-214AB, SMC	Active
5.0SMDJ150A	MDE Semiconductor Inc	150	167	243	20.6	5000	-55 to 150	DO-214AB, SMC	Active
5.0SMDJ150A-T7	Littelfuse	150	167	243	20.6	5000	-65 to 150	DO-214AB, SMC	Active
SMCJ150A	Fairchild Semiconductor	150	167	243	6.2	1500	-55 to 150	DO-214AB, SMC	Active
SMCJ150A-TP	Micro Commercial Co	150	167	243	6.2	1500	-55 to 175	DO-214AB, SMC	Active

Engineering Selection Recommendations

All listed substitute parts maintain active production status and ROHS3 compliance, ensuring long-term availability and regulatory conformance.

SMDJ150A (Alpha & Omega Semiconductor Inc.) provides direct electrical equivalence to the SMLJ150A with identical voltage and current specifications. This part is the primary direct substitute when Bourns SMLJ150A inventory is unavailable.

5.0SMDJ150A and 5.0SMDJ150A-T7 (MDE Semiconductor Inc. and Littelfuse) are compatible alternatives that maintain identical voltage protection characteristics but provide enhanced current handling (20.6A peak pulse) and power dissipation (5000W). The Littelfuse variant extends the lower operating temperature limit to -65°C. These parts are suitable for applications requiring higher transient current capacity within the same voltage class.

SMCJ150A and SMCJ150A-TP (Fairchild Semiconductor and Micro Commercial Co) are compatible alternatives with reduced current handling (6.2A peak pulse) and power dissipation (1500W). The Micro Commercial Co variant extends the upper operating temperature limit to 175°C. These parts are suitable for applications with lower transient current requirements or space-constrained designs.

All substitute parts are available in the same DO-214AB (SMC) surface-mount package, ensuring mechanical and thermal compatibility with existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can SMDJ150A be used as a direct replacement for SMLJ150A?

A: Yes. SMDJ150A maintains identical electrical specifications including 150V reverse standoff voltage, 243V clamping voltage, 12.4A peak pulse current, and 3000W peak pulse power. Both parts use the DO-214AB (SMC) package and are rated for -55°C to 150°C operation.

Q: What is the difference between SMLJ150A and 5.0SMDJ150A?

A: Both parts maintain the same voltage protection class (150V reverse standoff, 243V clamping). The 5.0SMDJ150A provides higher current handling (20.6A versus 12.4A) and power dissipation (5000W versus 3000W). Selection depends on the peak transient current requirements of the application.

Q: Can SMCJ150A replace SMLJ150A in all applications?

A: SMCJ150A maintains voltage compatibility but provides reduced current handling (6.2A versus 12.4A) and power dissipation (1500W versus 3000W). Substitution is valid only when application transient currents do not exceed 6.2A peak pulse.

Q: Are all substitute parts available in the same package?

A: Yes. All listed substitute parts use the DO-214AB (SMC) surface-mount package, ensuring mechanical compatibility with existing PCB designs and assembly processes.

Q: What is the operating temperature range difference between SMCJ150A-TP and SMLJ150A?

A: SMCJ150A-TP extends the upper operating temperature limit to 175°C compared to SMLJ150A's 150°C maximum. Both parts maintain the same -55°C lower limit. This extended temperature rating may be beneficial for high-temperature application environments.

Q: Do all substitute parts have the same RoHS compliance status?

A: All listed substitute parts are ROHS3 compliant, ensuring regulatory conformance for applications requiring RoHS certification.

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