SMCJ33C Equivalent & Substitute Parts

Part Overview

The SMCJ33C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional Zener diode operates at a 33V reverse standoff voltage with a 55.97V maximum clamping voltage and 28.2A peak pulse current capability. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	33	V
Voltage - Breakdown (Min)	34.79	V
Voltage - Clamping (Max) @ Ipp	55.97	V
Current - Peak Pulse (10/1000µs)	28.2	A
Power - Peak Pulse	1500	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SMCJ33C are classified into two functional groups based on electrical performance:

Group 1: Direct Electrical Equivalents (1500W Peak Pulse Power) These parts maintain the same 33V reverse standoff voltage, 28.1–28.2A peak pulse current, and 1500W peak pulse power rating as the original SMCJ33C. Clamping voltages range from 53.3V to 55.97V. All parts use DO-214AB (SMC) surface-mount packaging. This group includes SMCJ33CA, SMCJ33CA V7G, TV15C330JB-G, TV15C330JB-HF, SMCJ33CAE3/TR13, 1SMC33CA TR13 PBFREE, and ATV15C330JB-HF. These parts are interchangeable for applications requiring the original electrical specifications.

Group 2: Enhanced Performance Alternatives (5000W Peak Pulse Power) These parts maintain the same 33V reverse standoff voltage and 53.3V clamping voltage but provide higher peak pulse current (93.9A) and 5000W peak pulse power rating. This group includes 5.0SMDJ33CA, 5.0SMDJ33CA-H, and 5.0SMLJ33CA-TP. These parts are suitable for applications requiring greater transient energy absorption capacity while maintaining the same voltage protection level.

Key Parameters Determining Substitution:

Voltage - Reverse Standoff: 33V (fixed)
Voltage - Clamping (Max) @ Ipp: 53.3V–55.97V (acceptable range)
Current - Peak Pulse: 28.1–28.2A (Group 1) or 93.9A (Group 2)
Power - Peak Pulse: 1500W (Group 1) or 5000W (Group 2)
Package / Case: DO-214AB, SMC (all parts)
Mounting Type: Surface Mount (all parts)

Parameter Comparison

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 Temp (°C)	Product Status	Package
SMCJ33C	Littelfuse Inc.	33	34.79	55.97	28.2	1500	-55 to 150	Obsolete	DO-214AB, SMC
SMCJ33CA	MDD	33	36.7	53.3	28.2	1500	-50 to 150	Active	DO-214AB, SMC
SMCJ33CA V7G	Taiwan Semiconductor Corporation	33	36.7	53.3	29	1500	-55 to 150	Discontinued at DiGi Electronics	DO-214AB, SMC
TV15C330JB-G	Comchip Technology	33	36.7	53.3	28.14	1500	-55 to 150	Active	DO-214AB, SMC
TV15C330JB-HF	Comchip Technology	33	36.7	53.3	28.14	1500	-55 to 150	Active	DO-214AB, SMC
SMCJ33CAE3/TR13	Microchip Technology	33	36.7	53.3	28.1	1500	-65 to 150	Active	DO-214AB, SMC
1SMC33CA TR13 PBFREE	Central Semiconductor Corp	33	36.7	53.3	28.1	1500	-65 to 150	Active	DO-214AB, SMC
ATV15C330JB-HF	Comchip Technology	33	36.7	53.3	28.14	1500	-55 to 150	Active	DO-214AB, SMC
5.0SMDJ33CA	HY Electronic (Cayman) Limited	33	36.7	53.3	93.9	5000	-65 to 150	Active	DO-214AB, SMC
5.0SMDJ33CA-H	Bourns Inc.	33	36.7	53.3	93.9	5000	-55 to 150	Active	DO-214AB, SMC
5.0SMLJ33CA-TP	Micro Commercial Co	33	36.7	53.3	93.9	5000	-55 to 175	Active	DO-214AB, SMC

Engineering Selection Recommendations

For Direct Replacement (1500W Power Rating): Select from SMCJ33CA, TV15C330JB-G, TV15C330JB-HF, SMCJ33CAE3/TR13, or 1SMC33CA TR13 PBFREE. All are active products with ROHS3 compliance and MSL 1 rating. SMCJ33CAE3/TR13 and 1SMC33CA TR13 PBFREE offer extended low-temperature operation (-65°C minimum) compared to SMCJ33CA (-50°C minimum). TV15C330JB-G and TV15C330JB-HF are functionally identical Comchip alternatives. ATV15C330JB-HF is qualified to AEC-Q101 automotive standards and suitable for automotive applications.

For Enhanced Transient Protection (5000W Power Rating): Select from 5.0SMDJ33CA, 5.0SMDJ33CA-H, or 5.0SMLJ33CA-TP when circuit design requires higher transient energy absorption. All three maintain 33V reverse standoff and 53.3V clamping voltage while providing 93.9A peak pulse current. 5.0SMLJ33CA-TP offers the highest operating temperature range (-55°C to 175°C). All are active products with ROHS3 compliance.

Compliance Considerations: All substitute parts are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity). Parts designated with REACH Affected status (5.0SMDJ33CA, 5.0SMDJ33CA-H) require verification against specific REACH substance restrictions for your application region.

Frequently Asked Questions (FAQ)

Q: Can SMCJ33CA directly replace SMCJ33C? A: Yes. Both parts maintain 33V reverse standoff voltage, 28.2A peak pulse current, and 1500W peak pulse power in DO-214AB SMC packaging. SMCJ33CA is an active product from MDD, whereas SMCJ33C is obsolete from Littelfuse. The clamping voltage difference (53.3V vs. 55.97V) falls within acceptable substitution parameters for general-purpose transient suppression.

Q: What is the difference between Group 1 and Group 2 substitutes? A: Group 1 parts (SMCJ33CA, TV15C330JB-G, etc.) maintain the original 1500W peak pulse power and 28.1–28.2A peak pulse current. Group 2 parts (5.0SMDJ33CA, 5.0SMDJ33CA-H, 5.0SMLJ33CA-TP) provide 5000W peak pulse power and 93.9A peak pulse current. Both groups maintain the same 33V reverse standoff voltage. Select Group 2 only if circuit design requires higher transient energy absorption capacity.

Q: Are all substitute parts in the same package? A: Yes. All substitute parts use DO-214AB (SMC) surface-mount packaging, ensuring mechanical and footprint compatibility with the original SMCJ33C design.

Q: Which substitute part has the widest operating temperature range? A: 5.0SMLJ33CA-TP operates from -55°C to 175°C, providing the widest temperature range among all substitutes. For standard temperature applications, SMCJ33CAE3/TR13 and 1SMC33CA TR13 PBFREE extend the low-temperature limit to -65°C.

Q: Is ATV15C330JB-HF suitable for automotive applications? A: Yes. ATV15C330JB-HF is qualified to AEC-Q101 automotive standards and carries automotive-grade designation. It maintains the same electrical specifications as other Group 1 substitutes while meeting automotive qualification requirements.

Q: What does ROHS3 compliance mean for these parts? A: ROHS3 compliance indicates conformance to the Restriction of Hazardous Substances Directive 3, restricting lead, cadmium, mercury, hexavalent chromium, and specified brominated flame retardants. All substitute parts listed are ROHS3 compliant.

Q: Can I use a 5000W part in place of a 1500W part? A: Yes. The 5000W parts (Group 2) provide higher transient energy absorption while maintaining the same voltage protection level (33V reverse standoff, 53.3V clamping). This substitution is suitable for applications where enhanced overvoltage protection is beneficial or required.

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