1SMA30CAT3 Equivalent & Substitute Parts

Part Overview

The 1SMA30CAT3 is a bidirectional Transient Voltage Suppressor (TVS) diode manufactured by onsemi, rated for 30V reverse standoff voltage with a 48.4V maximum clamping voltage at peak pulse current. This component is designed for general-purpose transient protection in surface mount applications using the DO-214AC (SMA) package. The part is currently listed as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Substiute Parts

1SMA30CAT3

onsemiIn Stock: 17921SMA30CAT3 Datasheet

Current PartRFQ

SMAJ30CA

Good-Ark SemiconductorIn Stock: 35354SMAJ30CA Datasheet

DirectRFQ

SMAJ30CA

Good-Ark SemiconductorIn Stock: 35354SMAJ30CA Datasheet

DirectRFQ

SM4T35CAY

STMicroelectronicsIn Stock: 39052SM4T35CAY Datasheet

SimilarRFQ

SMAJ30CA-13-F

Diodes IncorporatedIn Stock: 17873SMAJ30CA-13-F Datasheet

SimilarRFQ

SMAJ30CA-TP

Micro Commercial CoIn Stock: 14131SMAJ30CA-TP Datasheet

SimilarRFQ

SMAJ30CA-TR

STMicroelectronicsIn Stock: 35430SMAJ30CA-TR Datasheet

SimilarRFQ

SMAJ30CAE3/TR13

Microchip TechnologyIn Stock: 1140SMAJ30CAE3/TR13 Datasheet

SimilarRFQ

TV04A300JB-G

Comchip TechnologyIn Stock: 1121TV04A300JB-G Datasheet

SimilarRFQ

TV04A300JB-HF

Comchip TechnologyIn Stock: 1041TV04A300JB-HF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 1SMA30CAT3 is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff (Typ): 30V
• Voltage - Breakdown (Min): 33.3V
• Voltage - Clamping (Max) @ Ipp: 48.4V
• Current - Peak Pulse (10/1000µs): 8.3A nominal
• Power - Peak Pulse: 400W
• Package / Case: DO-214AC (SMA)
• Bidirectional operation with single channel
• Surface mount configuration

Substitute parts are classified into two categories:

Direct Equivalents maintain identical electrical specifications and are pin-for-pin compatible replacements.

Similar Parts share the same voltage rating and package but may exhibit variations in peak pulse current handling or clamping voltage characteristics. These parts are functionally compatible within the same circuit topology but require verification of transient energy absorption capacity in the specific application.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

SMAJ30CA (Good-Ark Semiconductor), SMAJ30CA-13-F (Diodes Incorporated), and SMAJ30CA-TP (Micro Commercial Co) are direct electrical equivalents to the 1SMA30CAT3. All three maintain identical voltage ratings, clamping characteristics, and peak pulse current specifications. These parts are active products with ROHS3 compliance, providing long-term availability and regulatory alignment for new designs.

Enhanced Performance Alternative:

SMAJ30CAE3/TR13 (Microchip Technology) offers higher peak pulse current (10.3A) and increased power dissipation (500W) while maintaining the same voltage protection window. This part is suitable for applications requiring additional transient energy absorption margin.

Similar Voltage Rating Parts:

SM4T35CAY (STMicroelectronics) and SMAJ30CA-TR (STMicroelectronics) share the 30V reverse standoff voltage but exhibit higher clamping voltage (64.3V) and significantly higher peak pulse current (36A at 8/20µs). These parts are functionally compatible for 30V protection circuits but deliver different transient response characteristics. SM4T35CAY carries AEC-Q101 automotive qualification.

Comchip Technology Options:

TV04A300JB-HF and TV04A300JB-G (Comchip Technology) provide near-equivalent performance with 8.26A peak pulse current and 48.4V clamping voltage, maintaining compatibility with the original 1SMA30CAT3 specifications.

All recommended substitutes are available in active production status with ROHS3 compliance, ensuring regulatory compliance and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can I use SMAJ30CA as a direct replacement for 1SMA30CAT3?

A: Yes. SMAJ30CA maintains identical voltage ratings (30V reverse standoff, 33.3V breakdown, 48.4V clamping) and peak pulse current (8.3A) specifications. The part is pin-compatible in the DO-214AC (SMA) package and is an active product with ROHS3 compliance.

Q: What is the difference between the direct equivalents and similar parts?

A: Direct equivalents (SMAJ30CA, SMAJ30CA-13-F, SMAJ30CA-TP) match all electrical parameters of the 1SMA30CAT3. Similar parts (SM4T35CAY, SMAJ30CA-TR) maintain the 30V voltage rating but feature higher clamping voltage (64.3V) and peak pulse current (36A), altering transient response characteristics.

Q: Should I use SMAJ30CAE3/TR13 instead of the standard SMAJ30CA?

A: SMAJ30CAE3/TR13 is suitable if your circuit requires additional transient energy absorption capacity. It provides 10.3A peak pulse current and 500W power dissipation compared to 8.3A and 400W in the original specification. Both maintain the same voltage protection window.

Q: Are all substitute parts available in the same package?

A: Yes. All listed substitutes use the DO-214AC (SMA) surface mount package, ensuring mechanical and electrical compatibility with the original 1SMA30CAT3 footprint.

Q: What is the compliance status of these substitutes?

A: All active substitute parts listed are ROHS3 compliant. The original 1SMA30CAT3 is marked as RoHS non-compliant. Substitution with ROHS3-compliant parts aligns new designs with current regulatory requirements.

Q: Can I use SM4T35CAY in place of 1SMA30CAT3?

A: SM4T35CAY is functionally compatible for 30V protection applications but exhibits different transient characteristics due to higher clamping voltage (64.3V) and peak pulse current (36A). Use this part only if your circuit design accommodates these performance differences or requires enhanced transient suppression capability.

Q: Which substitute offers the best long-term availability?

A: SMAJ30CA (Good-Ark Semiconductor) and SMAJ30CA-13-F (Diodes Incorporated) are established active products with high inventory levels, providing reliable long-term supply continuity for production designs.