SMAJ30C Equivalent & Substitute Parts

Part Overview

The SMAJ30C 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 with a 30V reverse standoff voltage and provides 400W peak pulse power dissipation in a DO-214AC (SMA) package. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	30	V
Voltage - Breakdown (Min)	31.55	V
Voltage - Clamping (Max) @ Ipp	50.82	V
Current - Peak Pulse (10/1000µs)	8.3	A
Power - Peak Pulse	400	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SMAJ30C is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 30V
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Bidirectional Channels: 1
Type: Zener

Allowable Variation Parameters:

Voltage - Clamping (Max) @ Ipp: 48.4V to 54.6V (within acceptable transient suppression range)
Current - Peak Pulse (10/1000µs): 8.26A to 10.3A (equal or greater capacity)
Power - Peak Pulse: 400W to 500W (equal or greater capacity)
Operating Temperature Range: -55°C to -65°C minimum; 150°C to 175°C maximum

Substitute parts must maintain identical reverse standoff voltage, package configuration, and bidirectional operation. Variations in clamping voltage, peak current, and power dissipation are acceptable when they equal or exceed the original specification, provided the part remains suitable for general-purpose transient suppression applications.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Product Status	Package
SMAJ30C	Littelfuse Inc.	30V	50.82V	8.3A	400W	-65 to 150°C (TJ)	Obsolete	DO-214AC, SMA
SMAJ30CA	Good-Ark Semiconductor	30V	48.4V	8.3A	400W	-55 to 150°C (TJ)	Active	DO-214AC, SMA
SMAJ30CA-13-F	Diodes Incorporated	30V	48.4V	8.3A	400W	-55 to 150°C (TJ)	Active	DO-214AC, SMA
SMAJ30CA-TP	Micro Commercial Co	30V	48.4V	8.3A	400W	-55 to 175°C (TA)	Active	DO-214AC, SMA
SMAJ30CAE3/TR13	Microchip Technology	30V	48.4V	10.3A	500W	-65 to 150°C (TJ)	Active	DO-214AC, SMA
SMAJ30CE3/TR13	Microchip Technology	30V	54.6V	9.3A	500W	-65 to 150°C (TJ)	Active	DO-214AC, SMA
TV04A300JB-G	Comchip Technology	30V	48.4V	8.26A	400W	-55 to 150°C (TJ)	Active	DO-214AC, SMA
TV04A300JB-HF	Comchip Technology	30V	48.4V	8.26A	400W	-55 to 150°C (TJ)	Active	DO-214AC, SMA

Engineering Selection Recommendations

All listed substitute parts are ROHS3 compliant with MSL rating of 1 (Unlimited), matching the original SMAJ30C specifications. Selection should prioritize active product status for long-term availability and supply chain stability.

Primary Substitutes (Closest Electrical Match):

SMAJ30CA (Good-Ark Semiconductor): Direct electrical equivalent with active status and high inventory availability (35,300 pcs).
SMAJ30CA-13-F (Diodes Incorporated): Functionally equivalent with active status and substantial inventory (17,791 pcs).
TV04A300JB-G and TV04A300JB-HF (Comchip Technology): Equivalent performance with active status, though lower inventory levels.

Enhanced Performance Alternatives:

SMAJ30CAE3/TR13 (Microchip Technology): Provides higher peak pulse current (10.3A) and power dissipation (500W) while maintaining -65°C minimum operating temperature matching the original part.
SMAJ30CE3/TR13 (Microchip Technology): Offers higher clamping voltage (54.6V) and enhanced power rating (500W) for applications requiring additional transient margin.

Temperature Consideration:

SMAJ30CA-TP (Micro Commercial Co) extends maximum operating temperature to 175°C, suitable for high-temperature environments.

Frequently Asked Questions (FAQ)

Q: Can SMAJ30CA directly replace SMAJ30C? A: Yes. SMAJ30CA maintains identical reverse standoff voltage (30V), package configuration (DO-214AC, SMA), and peak pulse current (8.3A). The clamping voltage is slightly lower (48.4V vs. 50.82V), which is acceptable for general-purpose transient suppression. SMAJ30CA is active and widely available.

Q: What is the difference between SMAJ30CAE3/TR13 and SMAJ30CE3/TR13? A: Both are Microchip Technology products with enhanced power ratings (500W). SMAJ30CAE3/TR13 maintains the 48.4V clamping voltage with 10.3A peak pulse current. SMAJ30CE3/TR13 increases clamping voltage to 54.6V with 9.3A peak pulse current. Selection depends on whether lower clamping voltage or higher voltage margin is required for the application.

Q: Are Comchip TV04A300JB series parts compatible? A: Yes. TV04A300JB-G and TV04A300JB-HF are functionally equivalent with 30V reverse standoff, 48.4V clamping voltage, and 400W power rating. Both are active products in DO-214AC (SMA) package. Inventory availability is lower than Good-Ark or Diodes alternatives.

Q: Does operating temperature range affect substitution? A: The original SMAJ30C operates -65°C to 150°C. Most substitutes operate -55°C to 150°C, which is acceptable for standard industrial applications. SMAJ30CAE3/TR13 and SMAJ30CE3/TR13 maintain the -65°C minimum. SMAJ30CA-TP extends to 175°C maximum for high-temperature requirements.

Q: Are all substitutes RoHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant with MSL rating 1 (Unlimited), matching the original specification.

Q: What packaging options are available? A: All substitutes are supplied in Tape & Reel (TR) or Cut Tape (CT) packaging for surface-mount assembly. The physical package remains DO-214AC (SMA) across all alternatives.

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