SMCJ30A-M3/9AT Equivalent & Substitute Parts

Part Overview

The SMCJ30A-M3/9AT is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 30V reverse standoff category and is designed for general-purpose transient voltage protection applications. The part is Active status and RoHS3 compliant, making it suitable for modern electronic circuit protection requirements. Equivalent and substitute parts are identified based on matching electrical characteristics, mechanical compatibility, and operational parameters that ensure functional interchangeability within the specified application envelope.

Substiute Parts

SMCJ30A-M3/9AT

Vishay General Semiconductor - Diodes DivisionIn Stock: 942SMCJ30A-M3/9AT Datasheet

Current PartRFQ

SMCJ30A-E3/57T

Vishay General Semiconductor - Diodes DivisionIn Stock: 42554SMCJ30A-E3/57T Datasheet

DirectRFQ

SMCJ30A-E3/9AT

Vishay General Semiconductor - Diodes DivisionIn Stock: 2937SMCJ30A-E3/9AT Datasheet

DirectRFQ

SMCJ30A

MDDIn Stock: 23027SMCJ30A Datasheet

DirectRFQ

SMCJ30A

MDDIn Stock: 23027SMCJ30A Datasheet

DirectRFQ

SMCJ30A

MDDIn Stock: 23027SMCJ30A Datasheet

DirectRFQ

SMCJ30A-13-F

Diodes IncorporatedIn Stock: 1800SMCJ30A-13-F Datasheet

DirectRFQ

3.0SMCJ30A-13

Diodes IncorporatedIn Stock: 59873.0SMCJ30A-13 Datasheet

MFR RecommendedRFQ

5.0SMDJ30A-T7

Littelfuse Inc.In Stock: 14585.0SMDJ30A-T7 Datasheet

MFR RecommendedRFQ

SMCJ30A-TR

STMicroelectronicsIn Stock: 3397SMCJ30A-TR Datasheet

MFR RecommendedRFQ

SMDJ30A-T7

Littelfuse Inc.In Stock: 1398SMDJ30A-T7 Datasheet

MFR RecommendedRFQ

SMLJ30A-TP

Micro Commercial CoIn Stock: 4679SMLJ30A-TP Datasheet

MFR RecommendedRFQ

SZ1SMC30AT3G

Littelfuse Inc.In Stock: 3636SZ1SMC30AT3G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMCJ30A-M3/9AT is determined by the following critical parameters:

Primary Matching Criteria:

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

Secondary Compatibility Factors:

• Current - Peak Pulse (10/1000µs): 31A (baseline; higher ratings acceptable for enhanced protection margin)
• Power - Peak Pulse: 1500W (baseline; higher ratings acceptable)
• Operating Temperature Range: -55°C ~ 150°C minimum
• RoHS3 Compliance and MSL Level 1

Parts are grouped into three categories:

Group 1 - Direct Equivalents (Identical Electrical & Mechanical Specifications): Parts with matching voltage parameters, 31A peak pulse current, 1500W power rating, DO-214AB/SMC package, and identical operating temperature range.

Group 2 - Enhanced Performance Substitutes (Higher Current/Power Ratings): Parts with identical voltage parameters and package but higher peak pulse current (62A or greater) and proportionally higher power ratings (3kW or greater). These provide superior transient suppression capability while maintaining electrical compatibility.

Group 3 - Alternative Manufacturer Equivalents (Same Base Specifications): Parts from different manufacturers with matching core electrical parameters and package specifications, ensuring functional interchangeability.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitution (Group 1): SMCJ30A-E3/57T, SMCJ30A-E3/9AT, SMCJ30A-13-F, and SMCJ30A (MDD) are direct functional equivalents. All maintain identical voltage specifications (30V reverse standoff, 33.3V breakdown minimum, 48.4V clamping maximum), 31A peak pulse current, and 1500W power rating. These parts are suitable for one-to-one replacement in existing designs. All are Active status and RoHS3 compliant. The MDD variant operates at -50°C minimum (versus -55°C for Vishay and Diodes Incorporated), which is acceptable for most general-purpose applications.

Enhanced Performance Substitution (Group 2): 3.0SMCJ30A-13 (Diodes Incorporated) and SMDJ30A-T7 (Littelfuse Inc.) provide doubled peak pulse current (62A) and tripled power dissipation (3000W) while maintaining identical voltage parameters. These are suitable where enhanced transient suppression margin is required. The 3.0SMCJ30A-13 extends operating temperature to -55°C ~ 175°C. The SMDJ30A-T7 extends the lower temperature limit to -65°C.

Higher Power Substitution (Group 3): 5.0SMDJ30A-T7 (Littelfuse Inc.) provides the highest performance with 103A peak pulse current and 5000W power rating. This part is suitable for applications requiring maximum transient protection. Operating temperature range is -65°C ~ 150°C.

Non-Recommended Substitution: SMCJ30A-TR (STMicroelectronics) exhibits a higher clamping voltage of 64.3V (versus 48.4V specification) and significantly higher peak pulse current of 156A (8/20µs pulse). This part does not meet the clamping voltage requirement and introduces incompatible electrical characteristics.

All recommended substitutes maintain RoHS3 compliance and MSL Level 1 rating, ensuring compatibility with modern manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can SMCJ30A-E3/57T replace SMCJ30A-M3/9AT directly? A: Yes. Both parts are manufactured by Vishay with identical electrical specifications: 30V reverse standoff, 33.3V breakdown minimum, 48.4V clamping maximum, 31A peak pulse current, and 1500W power rating. The difference is in packaging designation (SMCJ versus SMC supplier device package). Both use DO-214AB surface mount package and are suitable for direct substitution.

Q: What is the difference between the 31A and 62A versions? A: The 31A version (SMCJ30A-M3/9AT baseline) provides 1500W peak pulse power dissipation. The 62A version (3.0SMCJ30A-13, SMDJ30A-T7) doubles the peak pulse current to 62A and increases power dissipation to 3000W. Both maintain identical voltage parameters. The 62A version is suitable where enhanced transient suppression margin is required, but is not necessary for applications designed for the 31A specification.

Q: Is the MDD SMCJ30A suitable as a substitute? A: Yes, with one consideration. The MDD variant operates at -50°C minimum temperature (versus -55°C for Vishay and Diodes Incorporated). All other electrical and mechanical specifications are identical. This part is suitable for applications where the -50°C lower limit is acceptable.

Q: Why is SMCJ30A-TR not recommended? A: SMCJ30A-TR (STMicroelectronics) has a clamping voltage of 64.3V, which exceeds the 48.4V specification of SMCJ30A-M3/9AT. This higher clamping voltage means the device will not suppress transients to the same voltage level, potentially allowing higher voltage stress on protected circuits. This part is not electrically compatible.

Q: Can I use the 5.0SMDJ30A-T7 in place of SMCJ30A-M3/9AT? A: Yes, with design consideration. The 5.0SMDJ30A-T7 maintains identical voltage specifications but provides 103A peak pulse current and 5000W power dissipation (versus 31A and 1500W). This represents a significant performance upgrade suitable for applications requiring maximum transient protection. The extended lower temperature limit (-65°C) provides additional operational margin. Verify that the higher current handling does not introduce unintended circuit behavior in your specific application.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All parts listed in the substitute table are RoHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with modern manufacturing processes and storage requirements.

Q: What packaging options are available? A: All parts use the DO-214AB surface mount package (also designated SMC or SMCJ depending on manufacturer). Packaging format varies between Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel options, which affects supply and handling but not electrical or mechanical compatibility. Verify packaging format availability with your supplier.