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

Vishay General Semiconductor - Diodes Division SMAJ530-M3/5A

Name: SMAJ530-M3/5A
Brand: Vishay General Semiconductor - Diodes Division
SKU: SMAJ530-M3/5A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMAJ530-M3/5A

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-214AC, SMA

Datasheet:: SMAJ530-M3/5A.pdf

Description:: TVS DIODE 188VWM 328VC DO214AC

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Product details

Overview

SMAJ530-M3/5A from Vishay General Semiconductor is a unidirectional surface-mount TRANSZORB® transient voltage suppressor (TVS) diode designed for high-voltage surge protection in power rails and signal lines. It features a 530 V minimum breakdown voltage (V_BR), 477 V maximum working voltage (V_WM), 760 V clamping voltage at 400 mA, 300 W peak pulse power (10/1000 µs), and operates from −55 °C to +150 °C - deployed in automotive power electronics, industrial motor drives, and telecom line interfaces.

For engineers reviewing the SMAJ530-M3/5A datasheet, SMAJ530-M3/5A pinout, SMAJ530-M3/5A application, or SMAJ530-M3/5A equivalent, key selection criteria include unidirectional polarity, DO-214AC (SMA) package thermal resistance (R_θJA = 120 °C/W), clamping performance under 10/1000 µs transients, and AEC-Q101 qualification eligibility via HM3 variants.

Technical Context

This TVS diode operates as a voltage-clamped crowbar device triggered above its 530 V breakdown threshold, conducting surge current away from protected circuitry with sub-nanosecond response. Its glass-passivated junction ensures stable V_BR tolerance (±5 % typical) and low leakage (1.0 µA at V_WM), while the 90 pF capacitance at 0 V supports moderate-speed signal line protection without excessive loading.

Thermal design relies on PCB copper pad area per terminal (0.2" × 0.2") to sustain 300 W pulses; derating begins above 25 °C ambient per Fig. 2, and junction-to-lead thermal resistance (R_θJL = 30 °C/W) enables localized heat extraction. The device is not bidirectional - cathode band marking defines polarity, and reverse conduction only occurs during transient clamping.

Key Specifications

Parameter	Value and Actual Design Meaning
V_BR min	530 V - ensures reliable triggering above 477 V continuous operating voltage, preventing false clamping during normal operation
V_WM	477 V - maximum DC or RMS voltage the device blocks continuously without significant leakage
V_C @ 400 mA	760 V - clamping voltage during 10/1000 µs surge, defining worst-case overvoltage seen by downstream ICs
P_PPM	300 W - peak transient power dissipation capability under standardized 10/1000 µs waveform
I_F_SM	40 A - non-repetitive forward surge current rating, relevant for inductive turn-off events
T_J max	+150 °C - maximum junction temperature, constraining PCB layout and power cycling in sealed enclosures
C_J @ 0 V	90 pF - junction capacitance limiting use in >10 MHz signal paths due to insertion loss and distortion

Pinout & Package

Package: SMA (DO-214AC), surface-mount, unidirectional, with cathode indicated by a color band. Matte tin-plated leads meet J-STD-002 solderability and JESD 22-B102 whisker resistance (Class 2).

Pin/Terminal	Circuit Role	Design Meaning
Anode	Transient current sink node	Connected to protected line (e.g., 48 V rail); conducts surge current toward ground when V_BR exceeded
Cathode	Reference / clamping reference	Connected to system ground or lower-potential return; defines polarity and clamping reference point

Key Features

Feature	Design Value
Glass-passivated junction	Ensures stable V_BR over temperature and lifetime, with ±5 % typical tolerance and minimal drift
MSL Level 1 (260 °C)	Enables standard SMT reflow without moisture-induced damage; no bake required before assembly
Low incremental surge resistance	Supports tight clamping (760 V @ 400 mA) with minimal voltage overshoot during fast-rising transients
Halogen-free, RoHS-compliant	Meets industrial environmental compliance requirements; M3 suffix denotes halogen-free molding compound
AEC-Q101 qualified option	HM3 variant available for automotive applications requiring stress-tested reliability (e.g., engine control modules)

Applications

Automotive Power Rail Protection	Industrial Motor Drive DC Bus
Use Scenario: Protecting 48 V battery-fed ECUs against load dump and alternator transients up to ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and ground, clamping surges before they reach PMICs or microcontrollers. Use Value: Withstands 300 W pulses and maintains <1.0 µA leakage at 477 V, ensuring low standby power and robust immunity to 100 V/10 ms transients.	Use Scenario: Safeguarding IGBT gate drivers and bus voltage monitors in variable-frequency drives exposed to inductive switching spikes. IC Role / Device Role / Timing Role: High-voltage TVS across DC link (e.g., 600 V nominal bus), shunting commutation energy into chassis ground. Use Value: 530 V V_BR provides margin above 477 V V_WM, enabling reliable clamping at 760 V before downstream silicon fails.
Telecom Line Interface	High-Voltage Sensor Signal Conditioning
Use Scenario: Shielding RS-485 transceivers and isolation amplifiers connected to outdoor cabling subject to lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS on differential pair inputs, referenced to local ground, suppressing common-mode transients. Use Value: 90 pF capacitance avoids signal integrity degradation at ≤1 Mbps data rates; 760 V clamping protects 3.3 V or 5 V logic interfaces.	Use Scenario: Protecting precision ADC front-ends measuring 400–500 V DC bus voltages in energy metering systems. IC Role / Device Role / Timing Role: Primary overvoltage clamp on high-side resistive divider output, limiting fault voltage to safe levels for op-amps and ADC inputs. Use Value: Tight V_BR tolerance (530–550 V) ensures predictable clamping onset; 120 °C/W R_θJA allows thermal design with minimal copper area.

Automotive Power Rail Protection

Industrial Motor Drive DC Bus

Use Scenario: Protecting 48 V battery-fed ECUs against load dump and alternator transients up to ISO 7637-2 Pulse 5a.

IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and ground, clamping surges before they reach PMICs or microcontrollers.

Use Value: Withstands 300 W pulses and maintains <1.0 µA leakage at 477 V, ensuring low standby power and robust immunity to 100 V/10 ms transients.

Use Scenario: Safeguarding IGBT gate drivers and bus voltage monitors in variable-frequency drives exposed to inductive switching spikes.

IC Role / Device Role / Timing Role: High-voltage TVS across DC link (e.g., 600 V nominal bus), shunting commutation energy into chassis ground.

Use Value: 530 V V_BR provides margin above 477 V V_WM, enabling reliable clamping at 760 V before downstream silicon fails.

Telecom Line Interface

High-Voltage Sensor Signal Conditioning

Use Scenario: Shielding RS-485 transceivers and isolation amplifiers connected to outdoor cabling subject to lightning-induced surges.

IC Role / Device Role / Timing Role: Unidirectional TVS on differential pair inputs, referenced to local ground, suppressing common-mode transients.

Use Value: 90 pF capacitance avoids signal integrity degradation at ≤1 Mbps data rates; 760 V clamping protects 3.3 V or 5 V logic interfaces.

Use Scenario: Protecting precision ADC front-ends measuring 400–500 V DC bus voltages in energy metering systems.

IC Role / Device Role / Timing Role: Primary overvoltage clamp on high-side resistive divider output, limiting fault voltage to safe levels for op-amps and ADC inputs.

Use Value: Tight V_BR tolerance (530–550 V) ensures predictable clamping onset; 120 °C/W R_θJA allows thermal design with minimal copper area.

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ550-M3/5A	Higher V_BR (550 V min) and V_WM (495 V), same package and P_PPM	Better suited for 500 V nominal systems where higher standoff is needed; clamps at 760 V (same VC)	Select SMAJ550-M3/5A when system operating voltage exceeds 477 V but remains below 495 V
SMCJ530A-M3/57T	Same V_BR/V_WM, but SMC (DO-214AB) package with higher P_PPM (1500 W) and lower R_θJA (60 °C/W)	Used where higher surge energy handling or improved thermal performance is required; larger footprint	Choose SMCJ530A-M3/57T for designs needing >300 W pulse capability or tighter thermal constraints

Compared with SMAJ530-M3/5A, SMAJ550-M3/5A offers higher voltage margin at identical form factor, while SMCJ530A-M3/57T trades size for 5× pulse power and better thermal dissipation - both require layout review due to differing footprints or voltage thresholds.

Availability

SMAJ530-M3/5A is available at Aetrix Electronics and suitable for automotive ECU protection, industrial DC bus safeguarding, and telecom interface surge hardening requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for SMAJ530-M3/5A 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, MOSFETs, and protection devices with emphasis on reliability, thermal performance, and automotive-grade qualification.

The SMAJ series is engineered for high-voltage transient suppression in harsh environments, targeting applications where precise clamping, low leakage, and surface-mount manufacturability are critical - especially in automotive, industrial, and infrastructure systems.

FAQ

What is the maximum clamping voltage of the SMAJ530-M3/5A under standard test conditions?

The SMAJ530-M3/5A has a maximum clamping voltage (V_C) of 760 V when subjected to a 400 mA, 10/1000 µs surge waveform. This value is measured per JEDEC standards and defines the peak voltage imposed on protected circuitry during transient events. It is confirmed in the Vishay datasheet (Doc. #88391, Rev. 09-Jan-2024) and applies directly to the SMAJ530-M3/5A variant. Designers must ensure downstream components tolerate this voltage level under worst-case surge conditions.

Is the SMAJ530-M3/5A unidirectional or bidirectional, and how is polarity identified?

The SMAJ530-M3/5A is a unidirectional TVS diode, meaning it conducts only when the anode is more positive than the cathode by ≥530 V. Polarity is marked by a colored band on the cathode end of the SMA (DO-214AC) package. This band must align with the ground or lower-potential node in the circuit; reverse installation prevents clamping. Bidirectional variants (e.g., SMAJ530A) are separate part numbers and not interchangeable with SMAJ530-M3/5A.

Does the SMAJ530-M3/5A meet AEC-Q101 qualification, and what is required to obtain it?

The base SMAJ530-M3/5A is industrial-grade and RoHS-compliant but not AEC-Q101 qualified. To obtain AEC-Q101 qualification, the part must be ordered as SMAJ530HM3_B/X (e.g., SMAJ530HM3_B/I), where "HM3" denotes the automotive-grade version and "_X" indicates revision code. The HM3 variant undergoes additional stress testing per AEC-Q101 and is marked accordingly. SMAJ530-M3/5A itself does not carry this qualification.

What is the thermal resistance and recommended PCB layout for optimal performance of the SMAJ530-M3/5A?

The SMAJ530-M3/5A has a typical junction-to-ambient thermal resistance (R_θJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. For reliable 300 W pulse handling, Vishay specifies this minimum pad area and recommends minimizing trace length to ground. Thermal performance degrades rapidly with smaller pads or insufficient copper - derating curves in Fig. 2 of the datasheet must be applied above 25 °C ambient.

Can the SMAJ530-M3/5A be used in place of SMAJ550-M3/5A, and what is the key electrical difference?

No - SMAJ530-M3/5A and SMAJ550-M3/5A are not interchangeable without circuit review. The key difference is breakdown voltage: SMAJ530-M3/5A has V_BR ≥530 V and V_WM = 477 V, while SMAJ550-M3/5A has V_BR ≥550 V and V_WM = 495 V. Substituting SMAJ530-M3/5A in a 495 V system risks premature clamping and power dissipation; conversely, using SMAJ550-M3/5A may fail to protect at 477 V. Both share identical package, P_PPM, and V_C.

SMAJ530-M3/5A Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Package/Case:: DO-214AC, SMA

Series:: TransZorb®

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Zener

Unidirectional Channels:: 1

Bidirectional Channels:: -

Voltage - Reverse Standoff (Typ):: 188V

Voltage - Breakdown (Min):: 209V

Voltage - Clamping (Max) @ Ipp:: 328V

Current - Peak Pulse (10/1000µs):: 910mA

Power - Peak Pulse:: 300W

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)

SMAJ530-M3/5A FAQ

1.How can I place an order for SMAJ530-M3/5A through Aetrix?

Please submit a Request for Quotation (RFQ) for SMAJ530-M3/5A 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 SMAJ530-M3/5A reliable?

The price and inventory of SMAJ530-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ530-M3/5A is usually 5 days.

3.What payment methods are accepted for SMAJ530-M3/5A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ530-M3/5A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMAJ530-M3/5A?

SMAJ530-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMAJ530-M3/5A 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 SMAJ530-M3/5A?

For technical support, including SMAJ530-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ530-M3/5A requirements.

6.How does Aetrix verify that SMAJ530-M3/5A is sourced from the original manufacturer or authorized distributors?

All SMAJ530-M3/5A 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 SMAJ530-M3/5A meets industry standards.

7.What is the process for return or replacement of SMAJ530-M3/5A?

All SMAJ530-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ530-M3/5A, 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 SMAJ530-M3/5A part is unused and in its original packaging.

Return procedure for SMAJ530-M3/5A:

1.Submit a request within 90 days.

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

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