SMCJ30A-13 Equivalent & Substitute Parts

Part Overview

The SMCJ30A-13 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 30V reverse standoff voltage with a 48.4V maximum clamping voltage and 31A peak pulse current capability in a DO-214AB (SMC) package. The main part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers to maintain design continuity and ensure supply chain availability.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	30	V
Voltage - Breakdown (Min)	33.3	V
Voltage - Clamping (Max) @ Ipp	48.4	V
Current - Peak Pulse (10/1000µs)	31	A
Power - Peak Pulse	1500	W
Package / Case	DO-214AB, SMC	—
Operating Temperature Range	-55 to 150	°C
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the SMCJ30A-13 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Direct Substitution:

Voltage - Reverse Standoff (Typ): 30V
Voltage - Breakdown (Min): 33.3V
Voltage - Clamping (Max) @ Ipp: 48.4V
Package / Case: DO-214AB, SMC
Type: Zener, Unidirectional (1 channel)

Allowable Variations:

Current - Peak Pulse: Equal to or greater than 31A
Power - Peak Pulse: Equal to or greater than 1500W
Operating Temperature Range: May extend beyond the original range
Manufacturer: Different manufacturers acceptable if electrical specifications match
Packaging Format: Bulk or Tape & Reel formats are interchangeable for the same part number

Substitute parts are grouped into two categories: direct electrical equivalents (matching all critical parameters) and higher-performance alternatives (exceeding power and current ratings while maintaining voltage specifications).

Parameter Comparison

Part Number	Manufacturer	VR (Typ) V	VBR (Min) V	VC (Max) V	Ipp A	Power W	Package	Temp Range °C	Status
SMCJ30A-13	Diodes Incorporated	30	33.3	48.4	31	1500	DO-214AB, SMC	-55 to 150	Discontinued
SMCJ30A-13-F	Diodes Incorporated	30	33.3	48.4	31	1500	DO-214AB, SMC	-55 to 150	Active
SMCJ30A	MDD	30	33.3	48.4	31	1500	DO-214AB, SMC	-50 to 150	Active
SMCJ30A-TR	STMicroelectronics	30	33.3	64.3	156	1500	DO-214AB, SMC	-55 to 150	Active
SMDJ30A	Alpha & Omega Semiconductor Inc.	30	33.3	48.4	62	3000	DO-214AB, SMC	-55 to 150	Active
SMDJ30A-HR	Littelfuse Inc.	30	33.3	48.4	62	3000	DO-214AB, SMC	-65 to 150	Active
SMDJ30A-T7	Littelfuse Inc.	30	33.3	48.4	62	3000	DO-214AB, SMC	-65 to 150	Active
5.0SMDJ30A	Taiwan Semiconductor Corporation	30	33.3	48.4	103	5000	DO-214AB, SMC	-55 to 175	Active
5.0SMDJ30A-T7	Littelfuse Inc.	30	33.3	48.4	103	5000	DO-214AB, SMC	-65 to 150	Active

Engineering Selection Recommendations

Direct Electrical Equivalent (Preferred for Drop-In Replacement):

SMCJ30A-13-F from Diodes Incorporated is the primary substitute. This part maintains identical electrical specifications (30V standoff, 33.3V breakdown, 48.4V clamping, 31A peak pulse, 1500W power) and package format while offering active product status and RoHS3 compliance. The Tape & Reel packaging format is functionally equivalent to the original bulk packaging for assembly operations.

Alternative Direct Equivalent:

SMCJ30A from MDD provides matching electrical performance with active status and RoHS3 compliance. Operating temperature range extends to -50°C minimum (versus -55°C for the original), which is acceptable for most general-purpose applications. Inventory availability is significantly higher (22,928 units).

Higher-Performance Alternatives:

For applications requiring enhanced transient energy absorption, SMDJ30A variants (Alpha & Omega, Littelfuse) and 5.0SMDJ30A series (Taiwan Semiconductor, Littelfuse) maintain identical voltage specifications while providing 2× to 3.3× greater peak pulse current and power dissipation. These are suitable for designs with higher transient stress or margin requirements. All alternatives are RoHS3 compliant and carry active product status.

Packaging Consideration:

SMCJ30A-TR from STMicroelectronics differs in clamping voltage (64.3V) and peak pulse current (156A at 8/20µs pulse), making it suitable only for applications where higher clamping voltage is acceptable or beneficial.

Frequently Asked Questions (FAQ)

Q: Can SMCJ30A-13-F be used as a direct replacement for SMCJ30A-13?

A: Yes. SMCJ30A-13-F is electrically and mechanically identical to SMCJ30A-13, with the primary difference being packaging format (Tape & Reel versus bulk) and active product status. Both feature 30V standoff voltage, 48.4V clamping voltage, and 31A peak pulse current in DO-214AB (SMC) package.

Q: What is the difference between SMCJ30A and SMDJ30A variants?

A: Both maintain identical voltage specifications (30V standoff, 33.3V breakdown, 48.4V clamping). The SMDJ30A series provides higher peak pulse current (62A versus 31A) and power dissipation (3000W versus 1500W), making it suitable for higher-stress transient protection applications. Package and operating temperature ranges are comparable.

Q: Are the 5.0SMDJ30A series parts suitable replacements?

A: The 5.0SMDJ30A series maintains all critical voltage parameters but provides significantly higher peak pulse current (103A) and power dissipation (5000W). These are suitable for designs requiring enhanced transient margin or higher energy absorption. Verify that the application circuit can accommodate the higher performance characteristics without adverse effects.

Q: Does packaging format (bulk versus Tape & Reel) affect electrical performance?

A: No. Packaging format affects only handling, storage, and assembly logistics. Electrical and thermal performance are identical between bulk and Tape & Reel formats of the same part number.

Q: What compliance certifications should I verify for substitute parts?

A: All recommended substitutes carry RoHS3 compliance and REACH Unaffected status, matching the regulatory requirements of the original SMCJ30A-13. Verify MSL (Moisture Sensitivity Level) rating of 1 (Unlimited) for storage and handling compatibility.

Q: Can I use SMCJ30A-TR as a substitute?

A: SMCJ30A-TR from STMicroelectronics differs in clamping voltage (64.3V) and peak pulse current (156A), making it unsuitable as a direct replacement. Use only if your application circuit design specifically accommodates higher clamping voltage.

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