SMAJ30CA-13 Equivalent & Substitute Parts

Part Overview

The SMAJ30CA-13 is a transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated, 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 compact DO-214AC (SMA) package. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers to maintain design continuity and supply chain reliability.

Substiute Parts

SMAJ30CA-13

Diodes IncorporatedIn Stock: 5340SMAJ30CA-13 Datasheet

Current PartRFQ

SMAJ30CA-13-F

Diodes IncorporatedIn Stock: 17873SMAJ30CA-13-F Datasheet

DirectRFQ

SM4T35CAY

STMicroelectronicsIn Stock: 39052SM4T35CAY Datasheet

MFR RecommendedRFQ

SMAJ30CA

Good-Ark SemiconductorIn Stock: 35354SMAJ30CA Datasheet

MFR RecommendedRFQ

SMAJ30CA

Good-Ark SemiconductorIn Stock: 35354SMAJ30CA Datasheet

MFR RecommendedRFQ

SMAJ30CA-TP

Micro Commercial CoIn Stock: 14131SMAJ30CA-TP Datasheet

MFR RecommendedRFQ

SMAJ30CA-TR

STMicroelectronicsIn Stock: 35430SMAJ30CA-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMAJ30CA-13 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters (Must Match):

• Voltage - Reverse Standoff (Typ): 30V
• Voltage - Breakdown (Min): 33.3V
• Package / Case: DO-214AC, SMA
• Mounting Type: Surface Mount
• Bidirectional Channels: 1
• Type: Zener

Allowable Variation Parameters:

• Voltage - Clamping (Max) @ Ipp: 48.4V (baseline); higher values acceptable if within thermal and circuit constraints
• Current - Peak Pulse (10/1000µs): 8.3A (baseline); higher values acceptable
• Power - Peak Pulse: 400W (baseline); equal or higher values acceptable
• Operating Temperature Range: -55°C to 150°C (baseline); equal or extended ranges acceptable
• RoHS Status: Non-compliant (baseline); ROHS3 compliant alternatives acceptable

Substitute parts must maintain identical reverse standoff voltage, breakdown voltage, and package specifications. Clamping voltage, peak pulse current, and power dissipation may exceed baseline specifications without compromising circuit compatibility, provided the application does not impose upper limits on these parameters.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (Identical Electrical Performance):

SMAJ30CA-13-F (Diodes Incorporated) is the direct equivalent, offering identical electrical specifications with the advantage of active product status and ROHS3 compliance. This part is recommended as the primary substitute when supply continuity is required.

SMAJ30CA (Good-Ark Semiconductor) and SMAJ30CA-TP (Micro Commercial Co) provide equivalent electrical performance with active availability. Both maintain the 30V reverse standoff, 33.3V breakdown voltage, 48.4V clamping voltage, and 8.3A peak pulse current. SMAJ30CA-TP offers an extended operating temperature range to 175°C, providing additional thermal margin in high-temperature applications.

Higher Performance Alternatives:

SM4T35CAY (STMicroelectronics) and SMAJ30CA-TR (STMicroelectronics) feature enhanced peak pulse current (36A at 8/20µs) and higher clamping voltage (64.3V) while maintaining identical reverse standoff and breakdown voltages. These parts are suitable for applications requiring greater transient energy absorption. SM4T35CAY carries AEC-Q101 automotive qualification, appropriate for automotive-grade designs. SMAJ30CA-TR is available in active status with ROHS3 compliance.

All substitute parts maintain DO-214AC (SMA) surface-mount packaging and are compatible with existing PCB layouts and assembly processes.

Frequently Asked Questions (FAQ)

Q: Can SMAJ30CA-13-F be used as a direct drop-in replacement for SMAJ30CA-13?

A: Yes. SMAJ30CA-13-F is electrically and mechanically identical to SMAJ30CA-13, differing only in packaging format (Tape & Reel) and product status (Active vs. Discontinued). It is the recommended direct substitute.

Q: What is the difference between SMAJ30CA-13 and SM4T35CAY?

A: Both maintain 30V reverse standoff and 33.3V breakdown voltage. SM4T35CAY provides higher peak pulse current (36A vs. 8.3A) and higher clamping voltage (64.3V vs. 48.4V). The higher clamping voltage may affect circuit behavior in applications with strict voltage limits. SM4T35CAY is suitable only if the application tolerates or benefits from increased clamping voltage.

Q: Are all substitute parts compatible with the original PCB layout?

A: Yes. All substitute parts use identical DO-214AC (SMA) packaging and surface-mount configuration, ensuring mechanical and electrical compatibility with existing PCB designs without layout modifications.

Q: Does RoHS compliance affect electrical performance?

A: No. ROHS3-compliant alternatives (SMAJ30CA-13-F, SMAJ30CA, SMAJ30CA-TP, SMAJ30CA-TR) maintain identical electrical specifications to the non-compliant SMAJ30CA-13. RoHS compliance reflects manufacturing process changes only.

Q: Which substitute is recommended for automotive applications?

A: SM4T35CAY carries AEC-Q101 automotive qualification and is appropriate for automotive-grade designs. However, verify that the higher clamping voltage (64.3V) is acceptable for the specific circuit application.

Q: What is the difference between the packaging formats listed for substitute parts?

A: Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® refer to supply formats for automated assembly. Both formats contain identical components; the difference is in handling and delivery method. Select based on assembly process requirements.

Q: Can SMAJ30CA-TP be used in high-temperature environments?

A: SMAJ30CA-TP operates to 175°C (TA), compared to 150°C (TJ) for SMAJ30CA-13. This extended range provides additional thermal margin in high-temperature applications, though circuit design must still ensure junction temperature remains within specified limits.