SMDJ33C Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The SMDJ33C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 33V reverse standoff voltage with a 55.97V maximum clamping voltage and 56.3A peak pulse current capability in a DO-214AB (SMC) package. The SMDJ33C is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Reverse Standoff Voltage (Typ)	33	V
Breakdown Voltage (Min)	34.79	V
Clamping Voltage (Max) @ Ipp	55.97	V
Peak Pulse Current (10/1000µs)	56.3	A
Peak Pulse Power	3000	W
Package Type	DO-214AB (SMC)	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-65 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SMDJ33C is determined by the following electrical and mechanical parameters:

Primary Substitution Criteria:

Reverse standoff voltage: 33V (nominal)
Breakdown voltage minimum: 36.7V or higher
Package type: DO-214AB (SMC) surface mount
Bidirectional channel configuration: 1 channel
Type: Zener TVS diode
RoHS3 compliance

Secondary Compatibility Parameters:

Clamping voltage range: 53.3V to 55.97V @ Ipp
Peak pulse current: 28.1A to 56.3A (application-dependent)
Peak pulse power: 1500W to 3000W (application-dependent)
Operating temperature: -65°C to 175°C (minimum -55°C acceptable)
Moisture sensitivity level: MSL 1 (unlimited)

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

Group A (Full Current Rating): Parts with 56.2A to 56.3A peak pulse current and 3000W peak pulse power, providing direct electrical equivalence to the SMDJ33C.

Group B (Reduced Current Rating): Parts with 28.1A to 28.2A peak pulse current and 1500W peak pulse power, suitable for applications with lower transient energy requirements.

Parameter Comparison

Part Number	Manufacturer	Standoff Voltage (V)	Breakdown Min (V)	Clamp Voltage Max (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Package	Status
SMDJ33C	Littelfuse Inc.	33	34.79	55.97	56.3	3000	DO-214AB (SMC)	Obsolete
SMDJ33CA	Alpha & Omega Semiconductor Inc.	33	36.7	53.3	56.3	3000	DO-214AB (SMC)	Active
SMLJ33CA	Bourns Inc.	33	36.7	53.3	56.2	3000	DO-214AB (SMC)	Active
SMLJ33CA-TP	Micro Commercial Co	33	36.7	53.3	56.2	3000	DO-214AB (SMC)	Active
SMLJ33CAE3/TR13	Microchip Technology	33	36.7	53.3	56.2	300	DO-214AB (SMC)	Active
SMCJ33CA	MDD	33	36.7	53.3	28.2	1500	DO-214AB (SMC)	Active
SMCJ33CA-TP	Micro Commercial Co	33	36.7	53.3	28.2	1500	DO-214AB (SMC)	Active
SMCJ33CAE3/TR13	Microchip Technology	33	36.7	53.3	28.1	1500	DO-214AB (SMC)	Active
TV30C330JB-G	Comchip Technology	33	36.7	53.3	56.29	3000	DO-214AB (SMC)	Active
TV15C330JB-G	Comchip Technology	33	36.7	53.3	28.14	1500	DO-214AB (SMC)	Active

Engineering Selection Recommendations

Direct Equivalents (Group A - Full Current Rating):

SMDJ33CA, SMLJ33CA, SMLJ33CA-TP, and TV30C330JB-G are direct electrical equivalents with 56.2A to 56.3A peak pulse current and 3000W peak pulse power. These parts maintain the same transient suppression capability as the SMDJ33C and are recommended for applications requiring the full current rating. All are active products with ROHS3 compliance and MSL 1 moisture sensitivity rating.

Reduced Current Rating Alternatives (Group B):

SMCJ33CA, SMCJ33CA-TP, SMCJ33CAE3/TR13, and TV15C330JB-G feature 28.1A to 28.2A peak pulse current and 1500W peak pulse power. These parts are suitable for applications with lower transient energy requirements and provide cost optimization while maintaining the 33V standoff voltage and DO-214AB package compatibility.

Packaging Considerations:

Parts specified with "-TP" suffix (SMLJ33CA-TP, SMCJ33CA-TP) are supplied in tape and reel format. Parts with "E3/TR13" designation (SMLJ33CAE3/TR13, SMCJ33CAE3/TR13) are also tape and reel packaged. Standard bulk packaging is available for parts without these suffixes.

Compliance Status:

All substitute parts listed are ROHS3 compliant. SMLJ33CA carries REACH Affected status; all other substitutes are REACH Unaffected. Selection should account for supply chain compliance requirements specific to the end application and destination market.

Frequently Asked Questions (FAQ)

Q: Can SMDJ33CA directly replace SMDJ33C in existing designs?

A: Yes. SMDJ33CA maintains identical reverse standoff voltage (33V), breakdown voltage specification (36.7V minimum), package type (DO-214AB/SMC), and peak pulse current (56.3A). The clamping voltage is slightly lower (53.3V vs. 55.97V), which is within acceptable tolerance for general-purpose transient suppression applications. Both are bidirectional single-channel devices with identical operating temperature ranges and RoHS3 compliance.

Q: What is the difference between Group A and Group B substitutes?

A: Group A parts (SMDJ33CA, SMLJ33CA, TV30C330JB-G) provide 56.2A to 56.3A peak pulse current and 3000W peak pulse power, matching the SMDJ33C specification. Group B parts (SMCJ33CA, TV15C330JB-G) provide 28.1A to 28.2A peak pulse current and 1500W peak pulse power. Selection depends on the transient energy level in the application. Group A is recommended for high-energy transient environments; Group B is suitable for lower-energy applications.

Q: Are tape and reel packaged parts electrically identical to bulk packaged parts?

A: Yes. Tape and reel packaging (-TP suffix) is a delivery format only and does not affect electrical performance. Parts such as SMLJ33CA-TP and SMCJ33CA-TP are electrically identical to their bulk-packaged counterparts (SMLJ33CA and SMCJ33CA). Selection between packaging formats is based on production volume and assembly line requirements.

Q: What does ROHS3 compliance mean for this component?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, hexavalent chromium, and specified brominated flame retardants. All substitute parts listed are ROHS3 compliant, ensuring compatibility with regulations in markets requiring hazardous substance restrictions.

Q: Can I use SMLJ33CAE3/TR13 as a substitute despite the 300W power rating discrepancy?

A: SMLJ33CAE3/TR13 is listed with 300W peak pulse power, which differs from the 3000W specification of the SMDJ33C and other Group A substitutes. This part should be used only in applications where transient energy is confirmed to be within 300W limits. For general-purpose replacement without application-specific analysis, Group A or Group B alternatives with verified power ratings are recommended.

Q: What is the operating temperature range consideration for substitute selection?

A: The SMDJ33C operates from -65°C to 150°C. Most substitutes operate from -55°C to 150°C, which is acceptable for most industrial and commercial applications. SMLJ33CA-TP and SMCJ33CA-TP extend to -55°C to 175°C, providing wider temperature margin. If the application requires operation below -55°C, verify that the selected substitute meets the specific temperature requirement.

Q: Are all substitute parts available in the same DO-214AB package?

A: Yes. All substitute parts listed are supplied in DO-214AB (SMC) surface-mount package, ensuring mechanical and footprint compatibility with designs originally specified for SMDJ33C. No PCB layout modifications are required when substituting between these parts.

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