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Vishay General Semiconductor - Diodes Division SMAJ30-E3/5A
- Part No.:
- SMAJ30-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30-E3/5A.pdf
- Description:
- TVS DIODE 30VWM 53.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,706
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Product details
Overview
SMAJ30-E3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping voltage transients on power and signal lines. It features 30 V stand-off voltage (VWM), 53.5 V maximum clamping voltage (VC) at 7.5 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting MOSFETs, ICs, and sensor interfaces in industrial and automotive electronics.
For engineers reviewing the SMAJ30-E3/5A datasheet, SMAJ30-E3/5A pinout, SMAJ30-E3/5A application, or SMAJ30-E3/5A equivalent, key selection criteria include unidirectional polarity, 30 V reverse stand-off capability, 7.5 A surge current handling, RoHS-compliant matte tin plating, and MSL Level 1 moisture sensitivity per J-STD-020.
Technical Context
This TVS diode operates as a clamping device triggered by overvoltage events exceeding its breakdown threshold of 33.3–40.7 V (VBR at 1 mA). Its low incremental surge resistance ensures rapid energy diversion during transients induced by inductive switching or ESD.
Thermal performance is defined by RθJA = 120 °C/W and RθJL = 30 °C/W, supporting reliable operation up to TJ = 150 °C. The device meets JESD201 Class 1A whisker resistance and is rated for solder dip at 260 °C for 40 s.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before clamping begins |
| VC @ IPPM | 53.5 V at 7.5 A - Clamped voltage during 10/1000 µs surge, limiting stress on downstream components |
| PPPM | 400 W - Peak pulse power dissipation capability under standard 10/1000 µs waveform |
| IPPM | 7.5 A - Maximum non-repetitive peak pulse current the device can safely divert |
| TJ Range | −55 °C to +150 °C - Operating junction temperature range enabling use in harsh environments |
| Package | DO-214AC (SMA) - Surface-mount outline with cathode band marking, compatible with automated placement |
Pinout & Package
DO-214AC (SMA) package with two terminals: anode and cathode. Cathode identified by a visible band on the body. Designed for PCB mounting on 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pads per terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to protected line's lower potential side | Completes conduction path during transient clamping when cathode is held at higher potential |
| Cathode | Current exit point in forward bias; marked with band; connected to reference or ground | Defines polarity and clamping reference node; must be tied to stable return path for effective suppression |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Enables robust protection against high-energy transients like ISO 7637-2 Pulse 1/2a without thermal runaway |
| Low clamping ratio (VC/VWM ≈ 1.78) | Minimizes overvoltage exposure to protected ICs while maintaining margin above normal operating voltage |
| MSL Level 1 rating | Allows unlimited floor life and reflow compatibility without dry-pack requirements |
| Glass passivated junction | Ensures stable leakage performance and long-term reliability under humidity and thermal cycling |
| RoHS-compliant matte tin plating | Supports lead-free assembly and meets J-STD-002/JESD22-B102 solderability standards |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load-dump and jump-start transients on 12 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges above 30 V. Use Value: Limits peak voltage to ≤53.5 V during 7.5 A transients, preventing damage to 36 V-rated power management ICs. | Use Scenario: Protecting analog outputs and digital communication lines (e.g., CAN, LIN) of pressure/temperature sensors in factory automation. IC Role / Device Role / Timing Role: Standoff-clamp TVS on signal lines referenced to local ground, absorbing ESD and switching noise. Use Value: Fast response (<1 ns) and low capacitance (<100 pF at 50 mVp-p, 1 MHz) avoid signal integrity degradation. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feeds |
Use Scenario: Guarding primary-side input rectifiers and controllers in AC/DC adapters against lightning-induced surges. IC Role / Device Role / Timing Role: Primary-side unidirectional TVS across bulk capacitor inputs, referenced to common-mode ground. Use Value: Withstands repetitive 400 W pulses at 0.01% duty cycle, extending adapter lifetime in surge-prone regions. | Use Scenario: Safeguarding -48 V DC distribution lines in base station power systems from accidental polarity reversal and inductive kickback. IC Role / Device Role / Timing Role: Reverse-polarity blocking and overvoltage clamp on telecom power feeds using unidirectional configuration. Use Value: 30 V VWM provides safe margin above nominal -48 V rail magnitude while clamping positive excursions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30A-E3/5A | Lower VBR range (33.3–36.8 V), tighter tolerance; 48.4 V VC at 8.3 A | Better suited for designs requiring lower clamping voltage and tighter VWM consistency | Select when system margin allows reduced clamping voltage and tighter VBR spec is critical |
| SMCJ30A-E3/57T | Higher power rating (1500 W), larger DO-214AB (SMC) package, same VWM/VC family | Used where higher surge energy (e.g., ISO 16750-2) demands greater PPPM headroom | Choose for enhanced ruggedness in high-risk environments; requires PCB layout change due to larger footprint |
Compared with SMAJ30-E3/5A, SMAJ30A-E3/5A offers improved clamping voltage and tighter breakdown spread but identical package and mounting; SMCJ30A-E3/57T delivers triple the pulse power in a physically larger package, necessitating board redesign but enabling compliance with more severe automotive surge standards.
Availability
SMAJ30-E3/5A is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, consumer power adapters, and telecom DC feeds requiring stable component supply across production lifecycles.
Supply support for SMAJ30-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, MOSFETs, and protection devices with emphasis on reliability and application-specific optimization.
The SMAJ series is engineered for surface-mount transient suppression in space-constrained, high-reliability applications - particularly targeting automotive (AEC-Q101 qualified variants), industrial, and telecom systems exposed to repetitive electrical surges.
FAQ
What is the breakdown voltage range of the SMAJ30-E3/5A?
The SMAJ30-E3/5A has a minimum breakdown voltage (VBR) of 33.3 V and a maximum of 40.7 V at 1 mA test current, per Vishay Document 88390. This range defines the voltage threshold at which the SMAJ30-E3/5A begins conducting significantly during overvoltage events, ensuring consistent clamping behavior across production lots.
Is the SMAJ30-E3/5A unidirectional or bidirectional?
The SMAJ30-E3/5A is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix and confirmed by its single-band marking and specification table placement under "UNI" column. It conducts only when cathode voltage exceeds anode voltage by ≥VBR, making it appropriate for DC power line protection with defined polarity.
What is the maximum clamping voltage for SMAJ30-E3/5A at its rated surge current?
The SMAJ30-E3/5A exhibits a maximum clamping voltage (VC) of 53.5 V at 7.5 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value represents the highest voltage seen across the SMAJ30-E3/5A during standardized surge testing and directly determines the protection level afforded to downstream circuitry.
Does the SMAJ30-E3/5A meet automotive qualification standards?
The base SMAJ30-E3/5A is commercial-grade and RoHS-compliant but not AEC-Q101 qualified. For automotive applications, Vishay offers the SMAJ30HE3/5A variant (with HE3 suffix), which is explicitly rated for high-reliability automotive use and certified to AEC-Q101. Always verify part number suffixes when selecting for automotive deployment.
What is the thermal resistance from junction to ambient for SMAJ30-E3/5A?
The SMAJ30-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on the recommended 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pad layout. This value is critical for calculating steady-state temperature rise and verifying safe operation within the −55 °C to +150 °C junction temperature range.
SMAJ30-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ30-E3/5A FAQ
1.How can I place an order for SMAJ30-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30-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 SMAJ30-E3/5A reliable?
The price and inventory of SMAJ30-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 SMAJ30-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ30-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30-E3/5A?
SMAJ30-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30-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 SMAJ30-E3/5A?
For technical support, including SMAJ30-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30-E3/5A requirements.
6.How does Aetrix verify that SMAJ30-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ30-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 SMAJ30-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ30-E3/5A?
All SMAJ30-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30-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 SMAJ30-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ30-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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