SMAJ30C-E3/5A Equivalent & Substitute Parts

Part Overview

The SMAJ30C-E3/5A is a transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for general-purpose overvoltage protection in surface-mount applications. This part operates with a 30V reverse standoff voltage and provides 53.5V maximum clamping voltage at peak pulse current. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts must maintain compatibility with the DO-214AC (SMA) package and preserve the core electrical characteristics required for transient suppression in the target application.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	30	V
Voltage - Breakdown (Min)	33.3	V
Voltage - Clamping (Max) @ Ipp	53.5	V
Current - Peak Pulse (10/1000µs)	7.5	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Type	Zener	—
Bidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution eligibility for the SMAJ30C-E3/5A is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 30V
Voltage - Breakdown (Min): 33.3V
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Type: Zener
Bidirectional Channels: 1
Operating Temperature Range: -55°C to 150°C minimum

Secondary Compatibility Parameters:

Voltage - Clamping (Max) @ Ipp: 48.4V to 64.3V (acceptable range for general-purpose protection)
Current - Peak Pulse (10/1000µs): 8.26A to 36A (higher ratings provide enhanced protection margin)
Power - Peak Pulse: 400W to 500W (higher ratings acceptable)
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Parts meeting all primary criteria and at least one secondary criterion are classified as direct substitutes. Parts with enhanced electrical ratings (higher clamping voltage or peak pulse current) are classified as upgrades and may be used where application requirements permit.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Product Status
SMAJ30C-E3/5A	Vishay General Semiconductor	30	33.3	53.5	7.5	400	-55 to 150	Obsolete
SMAJ30CA-E3/5A	Vishay General Semiconductor	30	33.3	48.4	8.3	400	-55 to 150	Active
SMAJ30CA	Good-Ark Semiconductor	30	33.3	48.4	8.3	400	-55 to 150	Active
TV04A300JB-G	Comchip Technology	30	33.3	48.4	8.26	400	-55 to 150	Active
SMAJ30CA-13-F	Diodes Incorporated	30	33.3	48.4	8.3	400	-55 to 150	Active
SMAJ30CE3/TR13	Microchip Technology	30	33.3	53.5	9.3	500	-65 to 150	Active
SMAJ30CA-TR	STMicroelectronics	30	33.3	64.3	36	400	-55 to 150	Active
SM4T35CAY	STMicroelectronics	30	33.3	64.3	36	400	-55 to 150	Active

Engineering Selection Recommendations

Direct Substitutes (Equivalent Electrical Performance):

SMAJ30CA-E3/5A, SMAJ30CA, TV04A300JB-G, and SMAJ30CA-13-F are direct substitutes for the SMAJ30C-E3/5A. These parts maintain the 30V reverse standoff voltage, 33.3V minimum breakdown voltage, and 48.4V clamping voltage within acceptable tolerance. All substitute parts are active products with ROHS3 compliance and MSL 1 rating, ensuring long-term availability and environmental compliance. The primary difference is reduced peak pulse current (8.26A to 8.3A versus 7.5A), which provides a margin of protection.

Enhanced Substitutes (Upgraded Electrical Performance):

SMAJ30CE3/TR13 (Microchip Technology) and SMAJ30CA-TR / SM4T35CAY (STMicroelectronics) offer enhanced electrical characteristics. SMAJ30CE3/TR13 maintains the original 53.5V clamping voltage while increasing peak pulse current to 9.3A and power dissipation to 500W, with extended lower operating temperature limit (-65°C). SMAJ30CA-TR and SM4T35CAY provide significantly higher peak pulse current (36A) and clamping voltage (64.3V), suitable for applications requiring enhanced transient suppression capability.

Compliance and Availability:

All substitute parts meet ROHS3 compliance and carry MSL 1 (Unlimited) moisture sensitivity rating. Product status is active for all substitutes, ensuring procurement continuity and long-term supply chain stability. Selection should prioritize active products from established manufacturers with demonstrated inventory levels.

Frequently Asked Questions (FAQ)

Q: Can SMAJ30CA-E3/5A be used as a direct replacement for SMAJ30C-E3/5A?

A: Yes. SMAJ30CA-E3/5A is a direct substitute. Both parts share identical reverse standoff voltage (30V), breakdown voltage (33.3V), and package specifications (DO-214AC, SMA). The clamping voltage is slightly lower (48.4V versus 53.5V), and peak pulse current is slightly higher (8.3A versus 7.5A), providing equivalent or improved protection performance.

Q: What is the difference between direct substitutes and enhanced substitutes?

A: Direct substitutes maintain electrical characteristics within the original part's specification range. Enhanced substitutes provide higher peak pulse current or clamping voltage ratings. Enhanced substitutes are suitable when application requirements permit higher transient suppression capability or when design margins require additional protection headroom.

Q: Are all substitute parts compatible with the original DO-214AC (SMA) package footprint?

A: Yes. All listed substitute parts use the DO-214AC (SMA) surface-mount package, ensuring mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Q: Does the operating temperature range affect substitution eligibility?

A: The SMAJ30C-E3/5A operates from -55°C to 150°C. SMAJ30CE3/TR13 extends the lower limit to -65°C, providing enhanced performance in cold environments. All other substitutes maintain the -55°C to 150°C range. Selection should match application temperature requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification and MSL 1 (Unlimited) moisture sensitivity rating, meeting current environmental and reliability standards.

Q: Which substitute offers the best protection margin for high-transient environments?

A: SMAJ30CA-TR and SM4T35CAY provide the highest peak pulse current (36A) and clamping voltage (64.3V), offering maximum protection margin. These parts are suitable for applications with severe transient conditions or where design margins require enhanced suppression capability.

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