SMDJ64 Equivalent & Substitute Parts

Part Overview

The SMDJ64 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 64V reverse standoff voltage, 108.15V maximum clamping voltage, and 3000W peak pulse power rating in a DO-214AB (SMC) package. The SMDJ64 is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	64V	V
Voltage - Breakdown (Min)	67.37V	V
Voltage - Clamping (Max) @ Ipp	108.15V	V
Current - Peak Pulse (10/1000µs)	29.1A	A
Power - Peak Pulse	3000W	W
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature	-65°C ~ 150°C	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SMDJ64 is determined by the following critical parameters:

Voltage Parameters: Reverse standoff voltage (64V nominal), breakdown voltage minimum (67.37V), and clamping voltage maximum (108.15V) define the protection threshold. Substitute parts must maintain these voltage specifications within acceptable tolerances to ensure equivalent overvoltage protection.

Current Rating: Peak pulse current of 29.1A at 10/1000µs pulse duration establishes the transient energy handling capability. Substitute parts with equal or higher current ratings maintain functional equivalence.

Power Dissipation: 3000W peak pulse power rating indicates the thermal energy absorption capacity. Substitute parts must support this power level or higher.

Package Compatibility: DO-214AB (SMC) surface-mount package ensures mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Compliance: RoHS3 compliance and MSL rating (1 - Unlimited) are mandatory for environmental and manufacturing standards.

Substitute parts are grouped into two categories: direct equivalents (matching all critical parameters) and functional alternatives (meeting voltage and power requirements with minor parameter variations).

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Operating Temperature	Product Status	RoHS Status
SMDJ64	Littelfuse Inc.	64V	108.15V	29.1A	3000W	DO-214AB, SMC	-65°C ~ 150°C	Obsolete	ROHS3 Compliant
SMDJ64A	Alpha & Omega Semiconductor Inc.	64V	103V	29.2A	3000W	DO-214AB, SMC	-55°C ~ 150°C	Active	ROHS3 Compliant
SMCJ64A	Meritek	64V	103V	14.56A	1500W	DO-214AB, SMC	-55°C ~ 150°C	Active	ROHS3 Compliant
SMCJ64A-TP	Micro Commercial Co	64V	103V	14.6A	1500W	DO-214AB, SMC	-55°C ~ 175°C	Active	ROHS3 Compliant
SMCJ64AE3/TR13	Microchip Technology	64V	103V	14.6A	1500W	DO-214AB, SMC	-65°C ~ 150°C	Active	ROHS3 Compliant
SMLJ64A	Bourns Inc.	64V	103V	29.2A	3000W	DO-214AB, SMC	-55°C ~ 150°C	Active	ROHS3 Compliant
SMLJ64A-TP	Micro Commercial Co	64V	103V	29.2A	3000W	DO-214AB, SMC	-55°C ~ 175°C	Active	ROHS3 Compliant
1.5SMC75A	Taiwan Semiconductor Corporation	64.1V	103V	15A	1500W	DO-214AB, SMC	-55°C ~ 150°C	Active	ROHS3 Compliant
SMCJ58E3/TR13	Microchip Technology	58V	103V	14.6A	1500W	DO-214AB, SMC	-65°C ~ 150°C	Active	ROHS3 Compliant
SMLJ58E3/TR13	Microchip Technology	58V	103V	29.2A	300W	DO-214AB, SMC	-55°C ~ 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

SMDJ64A (Alpha & Omega Semiconductor Inc.) and SMLJ64A (Bourns Inc.) are the primary direct equivalents. Both maintain the 64V reverse standoff voltage, 29.1A–29.2A peak pulse current, and 3000W power rating. SMDJ64A operates across -55°C to 150°C, while SMLJ64A provides identical electrical performance. Both are active products with ROHS3 compliance and unlimited MSL rating.

SMLJ64A-TP (Micro Commercial Co) offers extended operating temperature range (-55°C to 175°C) with identical electrical specifications and active product status, suitable for applications requiring higher thermal margins.

Secondary Equivalents (Reduced Power Rating):

SMCJ64A (Meritek), SMCJ64A-TP (Micro Commercial Co), and SMCJ64AE3/TR13 (Microchip Technology) maintain the 64V voltage specification but feature reduced peak pulse current (14.56A–14.6A) and 1500W power rating. These parts are suitable for applications where the full 3000W power dissipation is not required. SMCJ64AE3/TR13 extends the lower operating temperature to -65°C, matching the original SMDJ64 specification.

Alternative Voltage Ratings:

1.5SMC75A (Taiwan Semiconductor Corporation) provides 64.1V reverse standoff voltage with 1500W power rating and 15A peak pulse current. SMCJ58E3/TR13 and SMLJ58E3/TR13 (Microchip Technology) operate at 58V reverse standoff, representing a lower voltage protection threshold suitable only for applications with reduced overvoltage requirements.

Compliance Status:

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) rating, ensuring compatibility with modern manufacturing and environmental standards. SMLJ64A carries REACH Affected status; all other substitutes are REACH Unaffected.

Frequently Asked Questions (FAQ)

Q: Can SMCJ64A replace SMDJ64 directly?

A: SMCJ64A maintains the 64V reverse standoff voltage and DO-214AB package compatibility but operates at 1500W peak pulse power versus the original 3000W rating. Direct replacement is valid only if the application does not require the full 3000W transient energy absorption capacity.

Q: What is the difference between SMDJ64A and SMLJ64A?

A: Both parts maintain 64V reverse standoff voltage, 29.1A–29.2A peak pulse current, and 3000W power rating. SMDJ64A is manufactured by Alpha & Omega Semiconductor Inc., while SMLJ64A is manufactured by Bourns Inc. Electrical performance is equivalent; selection depends on supplier availability and procurement requirements.

Q: Why do some substitutes have lower current ratings?

A: Parts designated with SMCJ prefix (e.g., SMCJ64A) are designed for lower transient energy applications and feature 1500W power dissipation versus 3000W for SMDJ and SMLJ series. Selection depends on the actual transient current and energy requirements of the circuit.

Q: Is SMCJ64AE3/TR13 suitable for the full operating temperature range of SMDJ64?

A: SMCJ64AE3/TR13 operates from -65°C to 150°C, matching the original SMDJ64 temperature specification. This part is suitable for applications requiring extended low-temperature performance.

Q: Can 1.5SMC75A be used as a substitute?

A: 1.5SMC75A provides 64.1V reverse standoff voltage (within tolerance of 64V) and 1500W power rating. Substitution is valid only for applications where 1500W power dissipation is sufficient and the 64.1V voltage specification meets circuit requirements.

Q: What is the impact of using SMCJ58E3/TR13 or SMLJ58E3/TR13?

A: These parts operate at 58V reverse standoff voltage, which is 6V lower than the original 64V specification. Use only in applications where the lower protection threshold is acceptable and does not compromise circuit protection requirements.

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

A: Packaging varies by manufacturer and part number. SMDJ64A, SMCJ64A-TP, SMCJ64AE3/TR13, SMLJ64A, SMLJ64A-TP, and 1.5SMC75A are available in Tape & Reel (TR) or Bulk packaging. Verify packaging specifications with the supplier before procurement.

Q: Do all substitutes maintain RoHS3 compliance?

A: All listed substitute parts are RoHS3 compliant. SMLJ64A carries REACH Affected status; verify REACH compliance requirements for your specific application and region.

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