SMCJ33CA-13 Transient Voltage Suppressor (TVS) Diode Equivalent & Substitute Parts

Part Overview

The SMCJ33CA-13 is a 33V Zener transient voltage suppressor diode manufactured by Diodes Incorporated in DO-214AB (SMC) surface mount package. This component is designed for general-purpose transient voltage suppression applications with a 53.3V maximum clamping voltage and 28.1A peak pulse current rating. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers that maintain the same electrical and mechanical specifications.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	33V
Voltage - Breakdown (Min)	36.7V
Voltage - Clamping (Max) @ Ipp	53.3V
Current - Peak Pulse (10/1000µs)	28.1A
Power - Peak Pulse	1500W
Type	Zener
Bidirectional Channels	1
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature Range	-55°C ~ 150°C (TJ)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following electrical and mechanical parameters:

Voltage - Reverse Standoff: 33V
Voltage - Breakdown (Min): 36.7V
Voltage - Clamping (Max) @ Ipp: 53.3V
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Type: Zener, Bidirectional

Substitute parts are grouped into two categories based on peak pulse current and power dissipation capacity:

Category A (Direct Equivalents): Parts with 28.1A to 28.2A peak pulse current and 1500W power rating. These provide identical electrical performance and are direct pin-for-pin replacements.

Category B (Enhanced Performance): Parts with 56.2A to 56.3A peak pulse current and 3000W power rating. These offer higher transient current handling and power dissipation while maintaining identical voltage specifications and package form factor.

Category C (High-Power Variants): Parts with 93.9A peak pulse current and 5000W power rating. These are designed for telecom applications requiring enhanced surge protection capability.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage Standoff (V)	Breakdown Min (V)	Clamp Max (V)	Peak Pulse Current (A)	Power Peak (W)	Package	Product Status	RoHS Status
SMCJ33CA-13	Diodes Incorporated	33	36.7	53.3	28.1	1500	DO-214AB, SMC	Discontinued	Non-compliant
SMCJ33CA-13-F	Diodes Incorporated	33	36.7	53.3	28.1	1500	DO-214AB, SMC	Active	ROHS3 Compliant
SMCJ33CA-TP	Micro Commercial Co	33	36.7	53.3	28.2	1500	DO-214AB, SMC	Active	ROHS3 Compliant
SMCJ33CA	MDD	33	36.7	53.3	28.2	1500	DO-214AB, SMC	Active	ROHS3 Compliant
SMDJ33CA	Alpha & Omega Semiconductor Inc.	33	36.7	53.3	56.3	3000	DO-214AB, SMC	Active	ROHS3 Compliant
SMDJ33CA-T7	Littelfuse Inc.	33	36.7	53.3	56.3	3000	DO-214AB, SMC	Active	ROHS3 Compliant
SMLJ33CA	Bourns Inc.	33	36.7	53.3	56.2	3000	DO-214AB, SMC	Active	ROHS3 Compliant
5.0SMDJ33CA	HY Electronic (Cayman) Limited	33	36.7	53.3	93.9	5000	DO-214AB, SMC	Active	ROHS3 Compliant
5.0SMDJ33CA-T7	Littelfuse Inc.	33	36.7	53.3	93.9	5000	DO-214AB, SMC	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Category A): SMCJ33CA-13-F (Diodes Incorporated) is the primary direct equivalent, offering identical electrical specifications with active product status and ROHS3 compliance. SMCJ33CA-TP (Micro Commercial Co) and SMCJ33CA (MDD) provide functionally equivalent alternatives with marginally higher peak pulse current (28.2A) and active status.

For Enhanced Performance Applications (Category B): SMDJ33CA (Alpha & Omega Semiconductor Inc.), SMDJ33CA-T7 (Littelfuse Inc.), and SMLJ33CA (Bourns Inc.) maintain identical voltage specifications while providing doubled peak pulse current (56.2A–56.3A) and power dissipation (3000W). These are suitable for applications requiring higher transient surge protection margins.

For High-Power Telecom Applications (Category C): 5.0SMDJ33CA (HY Electronic) and 5.0SMDJ33CA-T7 (Littelfuse Inc.) provide 93.9A peak pulse current and 5000W power rating. These are designated for telecom applications and maintain full voltage specification equivalence.

All recommended substitutes are ROHS3 compliant and carry active product status, ensuring long-term supply availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can SMCJ33CA-13-F be used as a direct replacement for SMCJ33CA-13? A: Yes. SMCJ33CA-13-F is electrically and mechanically identical, differing only in packaging format (Tape & Reel) and compliance status (ROHS3 compliant vs. non-compliant). It is a direct pin-for-pin substitute.

Q: What is the difference between Category A and Category B substitutes? A: Category A parts (SMCJ33CA-13-F, SMCJ33CA-TP, SMCJ33CA) maintain the original 28.1A–28.2A peak pulse current and 1500W power rating. Category B parts (SMDJ33CA, SMDJ33CA-T7, SMLJ33CA) double the peak pulse current to 56.2A–56.3A and power dissipation to 3000W, providing enhanced transient protection while maintaining identical voltage specifications.

Q: Are higher-power variants (Category B and C) backward compatible? A: Yes. Higher-power variants maintain identical voltage specifications (33V standoff, 36.7V breakdown, 53.3V clamp) and package form factor (DO-214AB, SMC). They are pin-compatible and can be used in applications designed for the original part. The increased current and power ratings provide additional design margin without affecting circuit operation.

Q: What packaging options are available? A: Substitute parts are available in bulk packaging and Tape & Reel (TR) format. SMCJ33CA-13-F, SMCJ33CA-TP, SMDJ33CA-T7, and SMLJ33CA-TP are supplied in Tape & Reel. MDD SMCJ33CA and HY Electronic 5.0SMDJ33CA are available in standard packaging. Verify packaging requirements with your procurement specification.

Q: Are all substitutes ROHS3 compliant? A: All recommended active substitutes are ROHS3 compliant. The original SMCJ33CA-13 is listed as RoHS non-compliant. Compliance status should be verified against your application requirements.

Q: Which substitute offers the best supply availability? A: HY Electronic 5.0SMDJ33CA and Littelfuse 5.0SMDJ33CA-T7 show the highest inventory levels (38,907 and 48,800 units respectively). For direct equivalents, SMCJ33CA-13-F (5,349 units) and SMCJ33CA-TP (5,330 units) provide adequate availability.

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