SMDJ150 Equivalent & Substitute Parts

Part Overview

The SMDJ150 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 150V reverse standoff voltage with a 255.15V maximum clamping voltage and 12.3A peak pulse current capability in a DO-214AB (SMC) package. The SMDJ150 is classified as obsolete, necessitating identification of active equivalent parts that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	150	V
Voltage - Breakdown (Min)	158.4	V
Voltage - Clamping (Max) @ Ipp	255.15	V
Current - Peak Pulse (10/1000µs)	12.3	A
Power - Peak Pulse	3000	W
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-65 to 150	°C
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SMDJ150 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff: 150V (exact match required)
Package / Case: DO-214AB, SMC (exact match required)
Mounting Type: Surface Mount (exact match required)
Unidirectional Channels: 1 (exact match required)
Type: Zener (exact match required)

Secondary Compatibility Parameters:

Voltage - Clamping (Max) @ Ipp: 243V to 255.15V (acceptable range)
Current - Peak Pulse (10/1000µs): 6.2A to 12.4A (acceptable range for general-purpose applications)
Power - Peak Pulse: 1500W to 3000W (acceptable range)
Operating Temperature Range: -55°C to 175°C minimum (acceptable if meets or exceeds -65°C to 150°C)

Substitute parts are grouped into two categories based on peak pulse current capability: 6.2A devices (lower current rating) and 12.3A–12.4A devices (equivalent current rating). Both categories maintain the same voltage protection characteristics and package form factor.

Parameter Comparison

Manufacturer 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 Temperature (°C)	Package	Product Status
SMDJ150	Littelfuse Inc.	150	158.4	255.15	12.3	3000	-65 to 150	DO-214AB, SMC	Obsolete
SMDJ150A	Alpha & Omega Semiconductor Inc.	150	167	243	12.4	3000	-55 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
SMCJ150AE3/TR13	Microchip Technology	150	167	243	6.2	1500	-65 to 150	DO-214AB, SMC	Active
SMLJ150A	Bourns Inc.	150	167	243	12.4	3000	-55 to 150	DO-214AB, SMC	Active
SMLJ150A-TP	Micro Commercial Co	150	167	243	12.4	3000	-55 to 175	DO-214AB, SMC	Active
TV15C151J-G	Comchip Technology	150	167	243	6.17	1500	-55 to 150	DO-214AB, SMC	Active
TV30C151J-G	Comchip Technology	150	167	243	12.35	3000	-55 to 150	DO-214AB, SMC	Active

Engineering Selection Recommendations

For Direct Replacement (Equivalent Current Rating):

SMDJ150A (Alpha & Omega Semiconductor Inc.), SMLJ150A (Bourns Inc.), SMLJ150A-TP (Micro Commercial Co), and TV30C151J-G (Comchip Technology) are functionally equivalent to the SMDJ150, each providing 12.3A–12.4A peak pulse current and 3000W power dissipation. All are active products with ROHS3 compliance. SMDJ150A and SMLJ150A are recommended for applications requiring the original performance envelope without extended temperature operation. SMLJ150A-TP extends the operating temperature range to 175°C and is suitable for high-temperature environments.

For Current-Limited Applications:

SMCJ150A (Fairchild Semiconductor), SMCJ150A-TP (Micro Commercial Co), SMCJ150AE3/TR13 (Microchip Technology), and TV15C151J-G (Comchip Technology) provide reduced peak pulse current (6.2A–6.17A) and 1500W power dissipation. These parts are suitable for applications where lower transient energy absorption is acceptable or where thermal constraints limit power dissipation. SMCJ150AE3/TR13 maintains the original -65°C lower temperature limit and is recommended for extended low-temperature operation.

Compliance Considerations:

All substitute parts are ROHS3 compliant. SMLJ150A carries REACH Affected status; verify compliance requirements for your application. All other substitutes are REACH Unaffected or REACH Compliant.

Frequently Asked Questions (FAQ)

Q: Can I use SMCJ150A (6.2A) as a direct replacement for SMDJ150 (12.3A)?

A: SMCJ150A is electrically compatible in terms of voltage protection (150V standoff, 243V clamping) and package form factor (DO-214AB, SMC). However, it provides half the peak pulse current (6.2A vs. 12.3A) and half the power dissipation (1500W vs. 3000W). Use SMCJ150A only if your circuit's transient energy requirements do not exceed 1500W peak pulse power.

Q: What is the difference between SMLJ150A and SMDJ150A?

A: Both provide equivalent electrical performance (150V standoff, 243V clamping, 12.4A peak pulse, 3000W power). The primary difference is manufacturer: SMLJ150A is manufactured by Bourns Inc., while SMDJ150A is manufactured by Alpha & Omega Semiconductor Inc. Both are active products with identical package specifications (DO-214AB, SMC).

Q: Does operating temperature range affect substitution compatibility?

A: Operating temperature range does not prevent substitution if the substitute meets or exceeds the original specification. The SMDJ150 operates from -65°C to 150°C. Substitutes with -55°C to 150°C or -55°C to 175°C ranges are acceptable for applications within the -55°C to 150°C window. SMCJ150AE3/TR13 and SMDJ150A maintain the -65°C lower limit for extended low-temperature applications.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Packaging varies by manufacturer and part number. SMDJ150A, SMCJ150A-TP, SMCJ150AE3/TR13, SMLJ150A, SMLJ150A-TP, TV15C151J-G, and TV30C151J-G are available in Tape & Reel (TR) packaging. SMCJ150A is available in Bulk packaging. Verify packaging availability with your supplier for production requirements.

Q: Which substitute is recommended for new designs?

A: SMDJ150A (Alpha & Omega Semiconductor Inc.) or SMLJ150A (Bourns Inc.) are recommended for new designs requiring equivalent performance to the obsolete SMDJ150. Both are active products with full ROHS3 compliance, 12.4A peak pulse current, and 3000W power dissipation in the standard DO-214AB, SMC package. Select based on supplier availability and lead time.

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