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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

Vishay General Semiconductor - Diodes Division SMAJ30C-E3/5A

Name: SMAJ30C-E3/5A
Brand: Vishay General Semiconductor - Diodes Division
SKU: SMAJ30C-E3/5A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMAJ30C-E3/5A

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-214AC, SMA

Datasheet:: SMAJ30C-E3/5A.pdf

Description:: TVS DIODE 30VWM 53.5VC DO214AC

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Product details

Overview

SMAJ30C-E3/5A from Vishay General Semiconductor is a bi-directional surface-mount Transient Voltage Suppressor (TVS) in DO-214AC (SMA) package, designed for clamping voltage transients on signal or power lines. It features a 30 V stand-off voltage (V_WM), 53.5 V maximum clamping voltage (V_C) at 7.5 A peak pulse current (I_PPM), and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting MOSFETs, ICs, and sensor signal lines in industrial and automotive electronics.

For engineers reviewing the SMAJ30C-E3/5A datasheet, SMAJ30C-E3/5A pinout, SMAJ30C-E3/5A application, or SMAJ30C-E3/5A equivalent, key selection criteria include bi-directional surge capability, low clamping ratio (V_C/V_WM = 1.78), RoHS-compliant matte tin terminals, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on standard PCB copper pads.

Technical Context

This bi-directional TVS diode operates symmetrically in both polarities, with identical electrical characteristics in forward and reverse directions. Its glass-passivated junction ensures stable breakdown behavior and fast response (<1 ps) to transient events such as ESD, inductive switching spikes, and lightning-induced surges.

The device is rated for 150 °C maximum junction temperature and exhibits 120 °C/W typical thermal resistance (junction-to-ambient) when mounted on 0.2 × 0.2 inch copper pads. It meets JESD201 Class 1A whisker resistance and complies with RoHS 2002/95/EC and WEEE 2002/96/EC directives.

Key Specifications

Parameter	Value and Actual Design Meaning
Stand-off Voltage (V_WM)	30 V - Maximum continuous reverse operating voltage before clamping begins
Clamping Voltage (V_C)	53.5 V at 7.5 A - Peak voltage seen by protected circuit during 10/1000 µs surge
Peak Pulse Power (P_PPM)	400 W - Surge energy handling capacity under standardized 10/1000 µs waveform
Breakdown Voltage (V_BR)	33.3–40.7 V at 1 mA - Confirmed avalanche onset range ensuring reliable triggering
Reverse Leakage (I_D)	≤1.0 µA at 30 V - Negligible standby current minimizing system power loss
Junction Temperature Range	−55 °C to +150 °C - Enables operation in under-hood automotive and industrial environments

Pinout & Package

Package: DO-214AC (SMA), surface-mount, bi-directional configuration with no polarity marking - symmetrical terminal design for AC-coupled or bidirectional signal line protection.

Pin/Terminal	Circuit Role	Design Meaning
Anode / Cathode (symmetrical)	Transient conduction path	Identical terminals; either end connects to protected line - no cathode band or polarity indicator required for bi-directional operation

Key Features

Feature	Design Value
Bi-directional clamping	Enables single-device protection of AC signals, differential buses, or ungrounded lines without polarity concerns
400 W peak pulse power	Handles IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on properly laid out PCBs with recommended copper pads
Low clamping ratio (1.78)	Minimizes overvoltage stress on downstream components compared to higher-ratio suppressors
MSL Level 1 rating	Allows unlimited floor life and reflow soldering at 260 °C peak without baking or special handling
RoHS-compliant matte tin leads	Ensures solderability per J-STD-002 and JESD22-B102, with JESD201 Class 1A whisker resistance

Applications

Automotive Sensor Interfaces	Industrial CAN Bus Lines
Use Scenario: Protecting analog sensor outputs (e.g., pressure, temperature) from load-dump and jump-start transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bi-directional TVS placed across sensor output and ground to clamp ±100 V transients within nanoseconds. Use Value: Prevents latch-up or permanent damage to precision ADC inputs while maintaining signal integrity below 30 V normal operation.	Use Scenario: Safeguarding CAN_H and CAN_L differential pair against ESD and coupled surges in factory automation controllers. IC Role / Device Role / Timing Role: One SMAJ30C-E3/5A per line (CAN_H–GND and CAN_L–GND) providing symmetrical clamping without affecting bus DC bias. Use Value: Maintains CAN FD bit timing integrity by limiting transient overshoot to ≤53.5 V, well below ISO 11898-2 fault thresholds.
Telecom DSL Line Cards	Consumer Appliance Motor Drivers
Use Scenario: Shielding ADSL/VDSL line interface transformers from lightning-induced surges entering via telephone wiring. IC Role / Device Role / Timing Role: Paired bi-directional TVS devices across transformer secondary windings to absorb common-mode transients. Use Value: Achieves ITU-T K.20/21 compliance with <100 ns response, preventing transformer saturation and PHY IC damage.	Use Scenario: Suppressing inductive kickback from brushed DC motors in washing machines or HVAC blowers. IC Role / Device Role / Timing Role: Mounted across motor terminals to clamp flyback voltages generated during PWM switching transitions. Use Value: Eliminates need for freewheeling diodes in low-cost designs while sustaining 40 A non-repetitive surge current (I_FSM).

Automotive Sensor Interfaces

Industrial CAN Bus Lines

Use Scenario: Protecting analog sensor outputs (e.g., pressure, temperature) from load-dump and jump-start transients in 12 V vehicle systems.

IC Role / Device Role / Timing Role: Bi-directional TVS placed across sensor output and ground to clamp ±100 V transients within nanoseconds.

Use Value: Prevents latch-up or permanent damage to precision ADC inputs while maintaining signal integrity below 30 V normal operation.

Use Scenario: Safeguarding CAN_H and CAN_L differential pair against ESD and coupled surges in factory automation controllers.

IC Role / Device Role / Timing Role: One SMAJ30C-E3/5A per line (CAN_H–GND and CAN_L–GND) providing symmetrical clamping without affecting bus DC bias.

Use Value: Maintains CAN FD bit timing integrity by limiting transient overshoot to ≤53.5 V, well below ISO 11898-2 fault thresholds.

Telecom DSL Line Cards

Consumer Appliance Motor Drivers

Use Scenario: Shielding ADSL/VDSL line interface transformers from lightning-induced surges entering via telephone wiring.

IC Role / Device Role / Timing Role: Paired bi-directional TVS devices across transformer secondary windings to absorb common-mode transients.

Use Value: Achieves ITU-T K.20/21 compliance with <100 ns response, preventing transformer saturation and PHY IC damage.

Use Scenario: Suppressing inductive kickback from brushed DC motors in washing machines or HVAC blowers.

IC Role / Device Role / Timing Role: Mounted across motor terminals to clamp flyback voltages generated during PWM switching transitions.

Use Value: Eliminates need for freewheeling diodes in low-cost designs while sustaining 40 A non-repetitive surge current (I_FSM).

Equivalent & Alternatives

The following parts are listed as comparable options for similar bi-directional TVS applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ30CA-E3/5A	Same electrical specs and package; CA suffix denotes identical bi-directional construction per Vishay documentation	No functional difference - CA and C suffixes are interchangeable per Document 88390 Table heading and ordering examples	Select based on distributor stock; both meet identical performance and qualification requirements
SMCJ30CA	Higher 1500 W P_PPM, larger DO-214AB (SMB) package, 64.5 V V_C at 23.3 A	Better suited for high-energy surges but requires larger board area and different pad layout	Choose SMCJ30CA only when system-level testing demands >400 W surge margin or higher I_PPM

Compared with SMAJ30C-E3/5A, SMAJ30CA-E3/5A offers identical protection performance in the same footprint, while SMCJ30CA trades compactness for higher surge capacity - making SMAJ30C-E3/5A optimal for space-constrained, cost-sensitive designs requiring certified 400 W transient immunity.

Availability

SMAJ30C-E3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus protection, telecom DSL line cards, and consumer appliance motor drivers requiring stable component supply and full traceability.

Supply support for SMAJ30C-E3/5A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and transient protection devices with emphasis on reliability and automotive-grade qualification.

The SMAJ series was developed specifically for surface-mount surge suppression in space-constrained, high-reliability applications - balancing low clamping voltage, robust surge handling, and automated assembly compatibility.

FAQ

What does the "C" suffix indicate in SMAJ30C-E3/5A?

The "C" suffix in SMAJ30C-E3/5A denotes a bi-directional configuration, meaning the device provides symmetrical transient suppression in both polarities. Per Vishay Document 88390, this enables use on AC-coupled lines or ungrounded differential pairs without polarity orientation concerns - unlike uni-directional variants marked "A" or no suffix.

Is SMAJ30C-E3/5A RoHS compliant and lead-free?

Yes, SMAJ30C-E3/5A is RoHS 2002/95/EC compliant and features matte tin-plated leads meeting J-STD-002 solderability standards. The "E3" suffix explicitly indicates commercial-grade RoHS compliance, and the device passes JESD201 Class 1A whisker testing - confirmed in the Mechanical Data section of Vishay Document 88390.

What is the maximum clamping voltage of SMAJ30C-E3/5A under surge conditions?

The maximum clamping voltage (V_C) of SMAJ30C-E3/5A is 53.5 V at 7.5 A peak pulse current (I_PPM) with a 10/1000 µs waveform. This value is measured per Figure 1 and Table on page 2 of Vishay Document 88390 and defines the upper voltage limit imposed on protected circuitry during standardized surge events.

Can SMAJ30C-E3/5A replace SMAJ30A-E3/5A in a design?

No - SMAJ30C-E3/5A is bi-directional, while SMAJ30A-E3/5A is uni-directional with a cathode band marking. Substituting them requires verifying circuit topology: SMAJ30C-E3/5A is appropriate for AC or floating lines, whereas SMAJ30A-E3/5A must be oriented correctly for DC-biased paths. Their V_BR, V_WM, and V_C differ per Table on page 2 of Document 88390.

What PCB pad layout is recommended for optimal thermal and surge performance of SMAJ30C-E3/5A?

Vishay specifies mounting SMAJ30C-E3/5A on 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pads per terminal to achieve rated 400 W peak pulse power. Smaller pads reduce heat dissipation and cause premature failure under repetitive surges - this layout is validated in the "Maximum Ratings" note (2) and Figure 4 of Document 88390.

SMAJ30C-E3/5A Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Package/Case:: DO-214AC, SMA

Series:: TransZorb®

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Zener

Unidirectional Channels:: -

Bidirectional Channels:: 1

Voltage - Reverse Standoff (Typ):: 30V

Voltage - Breakdown (Min):: 33.3V

Voltage - Clamping (Max) @ Ipp:: 53.5V

Current - Peak Pulse (10/1000µs):: 7.5A

Power - Peak Pulse:: 400W

Power Line Protection:: No

Applications:: General Purpose

Capacitance @ Frequency:: -

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AC (SMA)

SMAJ30C-E3/5A FAQ

1.How can I place an order for SMAJ30C-E3/5A through Aetrix?

Please submit a Request for Quotation (RFQ) for SMAJ30C-E3/5A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SMAJ30C-E3/5A reliable?

The price and inventory of SMAJ30C-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ30C-E3/5A is usually 5 days.

3.What payment methods are accepted for SMAJ30C-E3/5A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30C-E3/5A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMAJ30C-E3/5A?

SMAJ30C-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMAJ30C-E3/5A order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SMAJ30C-E3/5A?

For technical support, including SMAJ30C-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30C-E3/5A requirements.

6.How does Aetrix verify that SMAJ30C-E3/5A is sourced from the original manufacturer or authorized distributors?

All SMAJ30C-E3/5A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMAJ30C-E3/5A meets industry standards.

7.What is the process for return or replacement of SMAJ30C-E3/5A?

All SMAJ30C-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30C-E3/5A, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SMAJ30C-E3/5A part is unused and in its original packaging.

Return procedure for SMAJ30C-E3/5A:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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