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Vishay General Semiconductor - Diodes Division SMAJ30HE3/5A
- Part No.:
- SMAJ30HE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30HE3/5A.pdf
- Description:
- TVS DIODE 30VWM 53.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,272
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Product details
Overview
SMAJ30HE3/5A from Vishay General Semiconductor is a high-reliability, AEC-Q101-qualified unidirectional transient voltage suppressor (TVS) in DO-214AC (SMA) package, designed for automotive and industrial overvoltage protection. It features 30 V stand-off voltage (VWM), 53.5 V maximum clamping voltage (VC) at 7.5 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 µs waveform), protecting sensitive MOSFETs and ICs against inductive switching transients.
For engineers reviewing the SMAJ30HE3/5A datasheet, SMAJ30HE3/5A pinout, SMAJ30HE3/5A application, or SMAJ30HE3/5A equivalent, this device serves as a robust, RoHS-compliant, high-whisker-resistance (JESD 201 Class 2) TVS diode optimized for automotive-grade ESD and surge immunity in power supply rails, sensor interfaces, and CAN/LIN bus lines.
Technical Context
The SMAJ30HE3/5A employs a glass-passivated silicon avalanche junction to deliver fast response (<1 ps) and low incremental surge resistance, enabling precise clamping during sub-microsecond transients. Its unidirectional polarity-marked with a cathode band-ensures defined forward conduction and reverse surge suppression.
Thermally, it exhibits RθJA = 120 °C/W and RθJL = 30 °C/W, supporting reliable operation up to TJ = +150 °C. The device is rated for 40 A non-repetitive forward surge (8.3 ms half-sine) and meets MSL Level 1 per J-STD-020 with 260 °C solder dip tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin for protected circuitry. |
| VBR (min/max) | 33.3 V / 40.7 V at 1 mA - Breakdown voltage range ensures consistent avalanche initiation across production lots. |
| VC @ IPPM | 53.5 V at 7.5 A - Clamping voltage under 10/1000 µs surge; limits downstream voltage stress to ≤53.5 V during worst-case transients. |
| PPPM | 400 W - Peak pulse power handling capability; supports robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges. |
| IFSM | 40 A - Single half-sine surge rating (8.3 ms); enables survival of motor-commutation or relay-coil turn-off events. |
| TJ Range | –55 °C to +150 °C - Extended junction temperature range suitable for under-hood automotive environments. |
| Leakage ID | 1.0 µA max at VWM - Ultra-low reverse leakage preserves battery life and signal integrity in always-on systems. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, low-profile plastic case with matte tin-plated leads compliant with J-STD-002 and JESD22-B102. Cathode indicated by a single band on the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connects to lower-potential side (e.g., ground or return path); conducts during forward surge or bias conditions. |
| Cathode | Avalanche clamping terminal | Marked with band; connects to protected line (e.g., 30 V rail); initiates avalanche breakdown when reverse voltage exceeds VWM. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units, body electronics, and ADAS sensors. |
| JESD 201 Class 2 whisker resistance | Ensures long-term reliability under thermal cycling and high-humidity conditions without tin whisker growth risk. |
| Glass-passivated junction | Provides stable electrical parameters, enhanced moisture resistance, and improved long-term stability vs. epoxy-passivated alternatives. |
| MSL Level 1 rating | Allows unlimited floor life and reflow compatibility up to 260 °C peak, simplifying SMT assembly without baking. |
| 400 W 10/1000 µs pulse rating | Delivers higher surge energy absorption than standard SMAJ30A (300 W above 78 V), maintaining full rating at 30 V. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V power distribution networks in engine control modules from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges exceeding 30 V. Use Value: Limits rail voltage to ≤53.5 V during 7.5 A transients, preventing damage to microcontrollers and power management ICs. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors in factory automation PLCs exposed to relay-induced spikes. IC Role / Device Role / Timing Role: TVS connected across sensor output and ground to absorb fast-rising ESD and inductive kickback. Use Value: Sub-1 ns response and 1.0 µA leakage preserve signal fidelity while suppressing >400 W surges without loading the sensor output. |
| Automotive CAN Bus Line Protection | Consumer Power Adapter Input Stage |
|
Use Scenario: Secondary-level surge protection on CAN_H/CAN_L lines in vehicle infotainment gateways subjected to ISO 16750-2 pulses. IC Role / Device Role / Timing Role: Unidirectional SMAJ30HE3/5A used on each line referenced to ground, complementing primary common-mode choke filtering. Use Value: Clamps differential and common-mode transients to <53.5 V, ensuring CAN transceiver survival under ±35 V surge tests. |
Use Scenario: Input-stage transient suppression in wall-mounted AC/DC adapters for smart home devices, exposed to lightning-induced surges on mains input. IC Role / Device Role / Timing Role: TVS placed after bridge rectifier to protect downstream switching controllers from reverse-polarity and surge events. Use Value: Withstands 40 A 8.3 ms forward surge and maintains 30 V standoff, enabling compact design without sacrificial fusing. |
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 | Commercial-grade (non-AEC-Q101), JESD 201 Class 1A whisker rating, identical VWM/VC/PPPM specs. | Limited to non-automotive industrial or consumer use; not qualified for automotive temperature cycling or lifetime reliability testing. | Select when cost sensitivity outweighs automotive qualification requirements and system environment remains within commercial temperature range. |
| SMCJ30AHE3/5A | DO-214AB (SMC) package, 1500 W PPPM, same VWM/VC, larger footprint and higher thermal mass. | Used where higher surge energy (e.g., ISO 7637-2 Pulse 5b) or improved thermal dissipation is required; incompatible PCB layout. | Choose for heavy-duty industrial power supplies needing >3× surge margin; requires board redesign due to larger SMC package. |
Compared with SMAJ30HE3/5A, SMAJ30A-E3/5A offers identical electrical performance at lower qualification assurance, while SMCJ30AHE3/5A trades PCB space for 3.75× higher surge capacity-making SMAJ30HE3/5A the optimal balance of automotive reliability, compact SMA footprint, and 400 W protection for space-constrained ECUs and sensor nodes.
Availability
SMAJ30HE3/5A is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and consumer power adapter designs requiring stable component supply with guaranteed AEC-Q101 compliance and traceable lot history.
Supply support for SMAJ30HE3/5A 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, efficiency, and application-specific optimization.
The SMAJ series was developed specifically for surface-mount transient suppression in automotive, industrial, and telecom systems-prioritizing AEC-Q101 qualification, low clamping voltage, and robust surge handling in compact DO-214AC packages.
FAQ
What is the clamping voltage of SMAJ30HE3/5A at its rated peak pulse current?
The SMAJ30HE3/5A has a maximum clamping voltage (VC) of 53.5 V at 7.5 A peak pulse current (IPPM) under a 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88390 and defines the upper voltage limit imposed on protected circuitry during surge events. Maintaining VC ≤ 53.5 V ensures downstream components like microcontrollers or transceivers remain within safe operating voltage margins. The SMAJ30HE3/5A achieves this with low incremental resistance and fast avalanche response.
Is SMAJ30HE3/5A suitable for automotive applications?
Yes, SMAJ30HE3/5A is explicitly qualified to AEC-Q101 for automotive use, with extended temperature operation from –55 °C to +150 °C and JESD 201 Class 2 whisker resistance. Its DO-214AC package meets MSL Level 1 and withstands 260 °C solder reflow-critical for engine bay and transmission control modules. The SMAJ30HE3/5A is deployed in power rails, sensor interfaces, and communication buses across Tier 1 automotive systems where reliability under thermal cycling and vibration is mandatory.
How does SMAJ30HE3/5A differ from SMAJ30A-E3/5A?
The SMAJ30HE3/5A differs from SMAJ30A-E3/5A primarily in qualification and reliability: SMAJ30HE3/5A carries AEC-Q101 certification and JESD 201 Class 2 whisker resistance, whereas SMAJ30A-E3/5A is commercial-grade with Class 1A whisker rating. Electrically, both share identical VWM = 30 V, VC = 53.5 V, and PPPM = 400 W. The SMAJ30HE3/5A is intended for automotive and high-reliability industrial use, while SMAJ30A-E3/5A suits cost-sensitive consumer or non-automotive applications.
What is the maximum reverse leakage current for SMAJ30HE3/5A at its stand-off voltage?
The maximum reverse leakage current (ID) for SMAJ30HE3/5A is 1.0 µA at its stand-off voltage (VWM) of 30 V and TA = 25 °C. This ultra-low leakage minimizes standby power loss and avoids signal distortion in high-impedance sensor or communication circuits. The specification is verified per test condition in Table 2 of Vishay document 88390 and remains stable across the full operating temperature range due to the device's glass-passivated junction structure.
Can SMAJ30HE3/5A be used in bi-directional protection configurations?
No, SMAJ30HE3/5A is a unidirectional TVS diode, identified by its cathode band marking and specified only for reverse-biased clamping operation. For bi-directional protection, Vishay offers the SMAJ30CA variant (with "CA" suffix), which provides symmetrical clamping in both polarities and uses different marking codes. Using SMAJ30HE3/5A in a bi-directional configuration would allow forward conduction during negative transients, potentially damaging the device or failing to suppress the surge. Always match the device type-uni- or bi-directional-to the circuit's voltage polarity requirements.
SMAJ30HE3/5A 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ30HE3/5A FAQ
1.How can I place an order for SMAJ30HE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30HE3/5A 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 SMAJ30HE3/5A reliable?
The price and inventory of SMAJ30HE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ30HE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ30HE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30HE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30HE3/5A?
SMAJ30HE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30HE3/5A 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 SMAJ30HE3/5A?
For technical support, including SMAJ30HE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30HE3/5A requirements.
6.How does Aetrix verify that SMAJ30HE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ30HE3/5A 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 SMAJ30HE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ30HE3/5A?
All SMAJ30HE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30HE3/5A, 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 SMAJ30HE3/5A part is unused and in its original packaging.
Return procedure for SMAJ30HE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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