SMDJ30C Equivalent & Substitute Parts

Part Overview

The SMDJ30C is a 30V bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc. in DO-214AB (SMC) surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The SMDJ30C provides transient voltage suppression for general-purpose applications with a peak pulse power rating of 3000W and peak pulse current of 62A at 10/1000µs pulse width.

Key Parameters

Parameter	Value
Manufacturer Part Number	SMDJ30C
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Bidirectional Channels	1
Voltage - Reverse Standoff (Typ)	30V
Voltage - Breakdown (Min)	31.55V
Voltage - Clamping (Max) @ Ipp	50.82V
Current - Peak Pulse (10/1000µs)	62A
Power - Peak Pulse	3000W
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature	-65°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the SMDJ30C is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Parameters:

Reverse Standoff Voltage: 30V (Typ)
Bidirectional Channels: 1
Package / Case: DO-214AB, SMC (surface mount)
Mounting Type: Surface Mount
Peak Pulse Current: 62A (10/1000µs)
Peak Pulse Power: 3000W minimum

Acceptable Variation Range:

Voltage - Breakdown (Min): 31.55V to 33.3V
Voltage - Clamping (Max) @ Ipp: 48.4V to 50.82V
Operating Temperature: -55°C to -65°C (minimum), 150°C to 175°C (maximum)

All substitute parts listed maintain the core electrical specifications within the defined tolerance band and preserve the DO-214AB surface mount package footprint, ensuring direct PCB compatibility without layout modifications.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package	Product Status
SMDJ30C	Littelfuse Inc.	30V	31.55V	50.82V	62A	3000W	-65°C ~ 150°C	DO-214AB, SMC	Obsolete
SMDJ30CA	Alpha & Omega Semiconductor Inc.	30V	33.3V	48.4V	62A	3000W	-55°C ~ 150°C	DO-214AB, SMC	Active
SMLJ30CAE3/TR13	Microchip Technology	30V	33.3V	48.4V	62A	300W	-55°C ~ 150°C	DO-214AB, SMC	Active
3SMC30CA BK PBFREE	Central Semiconductor Corp	30V	33.3V	48.4V	62A	3000W	-65°C ~ 150°C	DO-214AB, SMC	Active
3SMC30CA TR13 PBFREE	Central Semiconductor Corp	30V	33.3V	48.4V	62A	3000W	-65°C ~ 150°C	DO-214AB, SMC	Active
5.0SMDJ30CA	MDE Semiconductor Inc	30V	33.3V	48.4V	103A	5000W	-55°C ~ 150°C	DO-214AB, SMC	Active
5.0SMLJ30CA-TP	Micro Commercial Co	30V	33.3V	48.4V	103A	5000W	-55°C ~ 175°C	DO-214AB, SMC	Active
ATV30C300JB-HF	Comchip Technology	30V	33.3V	48.4V	61.98A	3000W	-55°C ~ 150°C	DO-214AB, SMC	Active
SM30T35CAY	STMicroelectronics	30V	33.3V	48.4V	62A	3000W	-55°C ~ 175°C	DO-214AB, SMC	Active
SMC30J30CA	STMicroelectronics	30V	33.3V	48.4V	62A	3000W	-55°C ~ 175°C	DO-214AB, SMC	Active

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

SMDJ30CA (Alpha & Omega Semiconductor Inc.), 3SMC30CA BK PBFREE and 3SMC30CA TR13 PBFREE (Central Semiconductor Corp), SM30T35CAY (STMicroelectronics), and SMC30J30CA (STMicroelectronics) provide the closest electrical match to the SMDJ30C with identical 30V standoff voltage, 62A peak pulse current, and 3000W peak pulse power. All are active products with ROHS3 compliance. The Central Semiconductor parts maintain the extended temperature range (-65°C minimum) matching the original SMDJ30C specification.

Enhanced Performance Alternatives:

5.0SMDJ30CA (MDE Semiconductor Inc.) and 5.0SMLJ30CA-TP (Micro Commercial Co) offer increased peak pulse current (103A) and power rating (5000W) while maintaining the 30V standoff voltage and DO-214AB package. These parts provide design margin for applications requiring higher transient energy absorption. The 5.0SMLJ30CA-TP extends the maximum operating temperature to 175°C.

Automotive-Grade Option:

ATV30C300JB-HF (Comchip Technology) is qualified to AEC-Q101 automotive standard with equivalent electrical specifications to the standard industrial substitutes. This part is suitable for automotive and harsh environment applications.

Note on SMLJ30CAE3/TR13:

This Microchip Technology part maintains electrical compatibility but specifies 300W peak pulse power, which is significantly lower than the SMDJ30C 3000W rating. This part is suitable only for applications with reduced transient energy requirements.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for SMDJ30C?

A: Yes, SMDJ30CA, 3SMC30CA variants, SM30T35CAY, and SMC30J30CA are direct electrical and mechanical equivalents. All maintain the 30V standoff voltage, 62A peak pulse current, 3000W power rating, and DO-214AB surface mount package. No PCB layout changes are required.

Q: What is the difference between the standard substitutes and the 5.0SMDJ30CA / 5.0SMLJ30CA-TP?

A: The 5.0-series parts provide higher peak pulse current (103A) and power dissipation (5000W) compared to the standard 62A / 3000W specification. These are suitable for applications requiring greater transient suppression capability while maintaining the same 30V standoff voltage and package footprint.

Q: Why does SMLJ30CAE3/TR13 show only 300W power rating?

A: SMLJ30CAE3/TR13 is a lower-power variant of the 30V TVS diode family. It is electrically compatible for voltage suppression but is limited to applications with lower transient energy levels. Verify application requirements before selection.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant. Central Semiconductor and STMicroelectronics parts also carry REACH Unaffected status where specified.

Q: Which substitute offers the widest operating temperature range?

A: 5.0SMLJ30CA-TP and SM30T35CAY both support -55°C to 175°C operating temperature, extending the upper limit by 25°C compared to the SMDJ30C specification of -65°C to 150°C.

Q: Is the ATV30C300JB-HF suitable for non-automotive applications?

A: Yes. ATV30C300JB-HF is AEC-Q101 qualified but can be used in general-purpose applications. The automotive qualification ensures higher reliability standards and is not restrictive for other uses.

Q: Do packaging options affect substitution?

A: All substitute parts use the DO-214AB (SMC) surface mount package, ensuring identical PCB footprint and soldering process compatibility. Packaging variants (Bulk, Tape & Reel, Cut Tape) do not affect electrical performance or mechanical fit.

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