1SMA30CAT3G Equivalent & Substitute Parts

Part Overview

The 1SMA30CAT3G is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc. in the DO-214AC (SMA) surface mount package. This component is rated for 30V reverse standoff voltage with a 48.4V maximum clamping voltage at 8.3A peak pulse current and 400W peak pulse power dissipation. The part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	1SMA30CAT3G
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Package / Case	DO-214AC, SMA
Type	Zener
Bidirectional Channels	1
Voltage - Reverse Standoff (Typ)	30V
Voltage - Breakdown (Min)	33.3V
Voltage - Clamping (Max) @ Ipp	48.4V
Current - Peak Pulse (10/1000µs)	8.3A
Power - Peak Pulse	400W
Operating Temperature	-65°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the 1SMA30CAT3G are selected based on strict electrical and mechanical parameter matching. The critical substitution criteria are:

Mandatory Matching Parameters:

Voltage - Reverse Standoff (Typ): 30V
Voltage - Breakdown (Min): 33.3V
Voltage - Clamping (Max) @ Ipp: 48.4V
Current - Peak Pulse (10/1000µs): 8.3A
Power - Peak Pulse: 400W
Package / Case: DO-214AC, SMA
Type: Zener, Bidirectional (1 channel)
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (Identical Electrical Specifications): Parts with matching voltage ratings, clamping voltage, peak pulse current, and power dissipation. These parts are fully interchangeable from an electrical standpoint.

Category B - Functional Equivalents with Parameter Variations: Parts that maintain the 30V reverse standoff voltage and DO-214AC package but may have different clamping voltages, peak pulse currents, or power ratings. These require circuit-level evaluation for compatibility.

Parameter Comparison

Part Number	Manufacturer	Status	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package
1SMA30CAT3G	Littelfuse Inc.	Obsolete	30V	48.4V	8.3A	400W	-65°C ~ 150°C (TJ)	DO-214AC, SMA
SMAJ30CA	Good-Ark Semiconductor	Active	30V	48.4V	8.3A	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA
SMAJ30CA-13-F	Diodes Incorporated	Active	30V	48.4V	8.3A	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA
SMAJ30CA-E3/61	Vishay General Semiconductor - Diodes Division	Active	30V	48.4V	8.3A	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA
SMAJ30CA-M3/61	Vishay General Semiconductor - Diodes Division	Active	30V	48.4V	8.3A	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA
SMAJ30CA-TP	Micro Commercial Co	Active	30V	48.4V	8.3A	400W	-55°C ~ 175°C (TA)	DO-214AC, SMA
TV04A300JB-G	Comchip Technology	Active	30V	48.4V	8.26A	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA
SM4T35CAY	STMicroelectronics	Active	30V	64.3V	36A (8/20µs)	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA
SMA5J30CA-E3/5A	Vishay General Semiconductor - Diodes Division	Active	30V	48.4V	10.3A	500W	-55°C ~ 150°C (TJ)	DO-214AC, SMA
SMAJ30CA-TR	STMicroelectronics	Active	30V	64.3V	36A (8/20µs)	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA

Engineering Selection Recommendations

Primary Substitutes (Direct Electrical Equivalents):

SMAJ30CA (Good-Ark Semiconductor), SMAJ30CA-13-F (Diodes Incorporated), SMAJ30CA-E3/61 (Vishay), SMAJ30CA-M3/61 (Vishay), and TV04A300JB-G (Comchip Technology) are direct electrical equivalents with identical voltage ratings (30V reverse standoff, 48.4V clamping) and current specifications (8.3A peak pulse). All are active products with ROHS3 compliance and MSL 1 rating. These parts are suitable for direct replacement in applications requiring the original 1SMA30CAT3G specifications.

SMAJ30CA-TP (Micro Commercial Co) offers an extended operating temperature range to 175°C (TA) while maintaining identical electrical specifications, providing enhanced thermal performance for high-temperature applications.

Secondary Substitutes (Enhanced Performance):

SMA5J30CA-E3/5A (Vishay) maintains the 30V reverse standoff and 48.4V clamping voltage but provides increased peak pulse current (10.3A) and power dissipation (500W). This part is suitable for applications requiring higher transient energy absorption while maintaining the same voltage protection level.

Functional Alternatives (Parameter Variations):

SM4T35CAY (STMicroelectronics) and SMAJ30CA-TR (STMicroelectronics) maintain the 30V reverse standoff voltage and DO-214AC package but feature significantly higher clamping voltage (64.3V) and peak pulse current (36A at 8/20µs). These parts are suitable only for applications where higher clamping voltage is acceptable and where the increased current handling capability is beneficial.

All recommended substitutes are active products with ROHS3 compliance and MSL 1 moisture sensitivity rating, ensuring long-term availability and environmental compliance.

Frequently Asked Questions (FAQ)

Q: Can SMAJ30CA be used as a direct replacement for 1SMA30CAT3G?

A: Yes. SMAJ30CA matches all critical electrical parameters: 30V reverse standoff voltage, 48.4V clamping voltage, 8.3A peak pulse current, and 400W power dissipation. Both use the DO-214AC (SMA) package. The primary difference is operating temperature range (-55°C to 150°C for SMAJ30CA versus -65°C to 150°C for the original), which is acceptable for most applications.

Q: What is the difference between SMAJ30CA-E3/61 and SMAJ30CA-M3/61?

A: Both parts are manufactured by Vishay and have identical electrical specifications. The difference lies in packaging and distribution format. SMAJ30CA-E3/61 is supplied in Tape & Reel (TR) format with higher inventory availability (19,300 pcs), while SMAJ30CA-M3/61 has limited inventory (1,085 pcs). Electrically, they are equivalent.

Q: Why is SM4T35CAY listed as a substitute if it has different clamping voltage?

A: SM4T35CAY maintains the 30V reverse standoff voltage and DO-214AC package but features 64.3V clamping voltage and 36A peak pulse current. This part is a functional alternative for applications where higher transient energy absorption is required or where the higher clamping voltage does not conflict with circuit design constraints. It is not a direct replacement but an enhanced-performance option.

Q: Is SMA5J30CA-E3/5A compatible with the original 1SMA30CAT3G?

A: SMA5J30CA-E3/5A is electrically compatible for voltage protection (30V reverse standoff, 48.4V clamping) but offers enhanced performance with 10.3A peak pulse current and 500W power dissipation compared to the original 8.3A and 400W. This part is suitable for applications requiring higher transient energy handling while maintaining the same voltage protection level.

Q: What packaging formats are available for these substitutes?

A: All substitute parts use the DO-214AC (SMA) surface mount package, matching the original 1SMA30CAT3G. Packaging formats vary by manufacturer and part number: some are supplied in Cut Tape (CT) & Digi-Reel format, while others are in Tape & Reel (TR) format. Verify packaging availability with your supplier for procurement requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental compliance of the original 1SMA30CAT3G.

Q: What is the temperature range difference between substitutes?

A: Most substitutes operate from -55°C to 150°C (TJ), compared to the original -65°C to 150°C. SMAJ30CA-TP extends to -55°C to 175°C (TA). For applications requiring operation below -55°C, verify that the original temperature range is mandatory before selecting a substitute.

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