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Vishay General Semiconductor - Diodes Division SMAJ7.0AHE3_A/H
- Part No.:
- SMAJ7.0AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.0AHE3_A/H.pdf
- Description:
- TVS DIODE 7VWM 12VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ7.0AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping fast-rising voltage transients on power and signal lines. It features a 7.0 V stand-off voltage (VWM), 7.78–8.60 V breakdown voltage (VBR) at 10 mA, 12.0 V maximum clamping voltage (VC) at 33.3 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - ideal for protecting MOSFETs, ICs, and sensor interfaces in automotive and industrial power rails.
For engineers reviewing the SMAJ7.0AHE3_A/H datasheet, SMAJ7.0AHE3_A/H pinout, SMAJ7.0AHE3_A/H application, or SMAJ7.0AHE3_A/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 120 °C/W junction-to-ambient thermal resistance, low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold, diverting surge energy away from downstream circuitry. Its glass-passivated junction ensures stable leakage performance and robust surge handling under repetitive transients.
The SMAJ7.0AHE3_A/H is rated for -55 °C to +150 °C operating junction temperature, supports 40 A non-repetitive forward surge current (8.3 ms half-sine), and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak - confirming suitability for high-reliability automotive PCB assembly without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 7.0 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe DC/AC working margin. |
| VBR (Breakdown Voltage) | 7.78–8.60 V at 10 mA - Voltage range at which avalanche conduction initiates; ensures predictable clamping onset. |
| VC (Clamping Voltage) | 12.0 V at 33.3 A - Maximum voltage seen across device during 10/1000 μs surge; determines protected circuit's peak stress level. |
| PPPM (Peak Pulse Power) | 400 W - Surge energy-handling capacity with standard 10/1000 μs waveform; sufficient for IEC 61000-4-5 Level 3 surges. |
| IPPM (Peak Pulse Current) | 33.3 A - Maximum transient current the device safely shunts without degradation; derived from VC and PPPM. |
| TJ max. | +150 °C - Maximum allowable junction temperature; enables operation in under-hood automotive environments. |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs derating requirements above 25 °C. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity indicated by cathode band; anode and cathode terminals are axially aligned along the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode | Reference node | Typically tied to system ground or lower-potential rail; completes clamping path during reverse-biased surge. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS power supplies, with guaranteed reliability under temperature cycling and humidity exposure. |
| 400 W peak pulse power | Supports robust protection against IEC 61000-4-5 combination wave surges up to 1 kV/500 A without failure or parameter shift. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage (<800 μA at VWM) across temperature and lifetime, critical for low-power sensor interfaces. |
| MSL Level 1 rating | Enables direct placement into lead-free reflow ovens at 260 °C peak without pre-baking, reducing manufacturing complexity and cost. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on protected ICs - e.g., keeps 3.3 V or 5 V logic rails within safe operating area during transients. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load-dump and inductive switching transients in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp surges before they reach LDOs and microcontrollers. Use Value: Limits transient voltage to ≤12.0 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic components powered from the same rail. | Use Scenario: Safeguarding analog output lines of pressure or temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Clamping device on 4–20 mA current loop or 0–10 V analog output traces exposed to ESD and cable discharge events. Use Value: Maintains signal integrity by suppressing transients faster than op-amp response time, avoiding ADC saturation or calibration drift. |
| Consumer Power Adapter Input Protection | Telecom DC Power Feeding Protection |
Use Scenario: Input-stage surge suppression in wall-mounted AC/DC adapters for smart home hubs and IoT gateways. IC Role / Device Role / Timing Role: First-line defense against line-side surges entering secondary-side 5 V/9 V/12 V outputs after isolation. Use Value: Withstands repeated 400 W pulses without degradation, extending adapter field life in regions with unstable grid conditions. | Use Scenario: Protecting PoE-powered devices (e.g., IP cameras, wireless APs) from induced surges on 48 V DC feeding lines. IC Role / Device Role / Timing Role: Unidirectional clamping element on DC input before DC-DC converter stage to prevent overvoltage shutdown. Use Value: Fast <1 ps response ensures clamping occurs before 48 V DC-DC controller ICs experience overvoltage lockout or internal FET failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.0A-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade without AEC-Q101 qualification. | Lacks automotive qualification; suitable for consumer/industrial designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and no vehicle-grade certification is needed. |
| SMBJ7.0AHE3_A/H | Same VWM, VBR, and VC; higher 600 W PPPM rating due to SMB (DO-214AA) package with larger thermal mass. | Better surge energy handling but requires larger PCB footprint; not drop-in compatible due to different pad layout and dimensions. | Choose when system-level surge testing exceeds 400 W requirements and board space allows SMB footprint. |
Compared with SMAJ7.0A-E3/61, the SMAJ7.0AHE3_A/H adds AEC-Q101 validation for automotive use; compared with SMBJ7.0AHE3_A/H, it trades 200 W pulse power headroom for 30% smaller PCB area - making SMAJ7.0AHE3_A/H optimal for space-constrained, vehicle-qualified designs requiring verified reliability.
Availability
SMAJ7.0AHE3_A/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor modules, and telecom power feeding circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ7.0AHE3_A/H 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 is engineered for high-speed transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against ESD, lightning-induced surges, and inductive switching spikes is mission-critical.
FAQ
What is the clamping voltage of the SMAJ7.0AHE3_A/H at its rated peak pulse current?
The SMAJ7.0AHE3_A/H has a maximum clamping voltage (VC) of 12.0 V at 33.3 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream 3.3 V or 5 V ICs remain within absolute maximum ratings. The SMAJ7.0AHE3_A/H maintains this clamping performance across its full operating temperature range.
Is the SMAJ7.0AHE3_A/H suitable for automotive applications?
Yes, the SMAJ7.0AHE3_A/H is AEC-Q101 qualified, meaning it has passed rigorous stress tests for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock. Its construction - glass-passivated junction, matte tin leads, and MSL Level 1 rating - supports under-hood deployment in engine control units, body electronics, and ADAS subsystems. The SMAJ7.0AHE3_A/H is explicitly designated for automotive use via its "HE3" suffix and revision-coded packaging ("_A/H").
What is the difference between SMAJ7.0AHE3_A/H and SMAJ7.0A-E3/61?
The SMAJ7.0AHE3_A/H and SMAJ7.0A-E3/61 share identical electrical parameters (VWM, VBR, VC, PPPM) and SMA package, but differ in qualification and compliance: SMAJ7.0AHE3_A/H is AEC-Q101 qualified and RoHS-compliant, while SMAJ7.0A-E3/61 is RoHS-compliant commercial grade only. Both use the same "H" tape-and-reel packaging (1800 units per 7" reel), but the SMAJ7.0AHE3_A/H carries additional automotive process controls and lot-level traceability required for Tier 1 automotive supply chains.
Does the SMAJ7.0AHE3_A/H have polarity marking, and how is it oriented on PCB?
Yes, the SMAJ7.0AHE3_A/H is unidirectional and features a visible cathode band at one end of the SMA (DO-214AC) package. During PCB layout, the banded end must be connected to the line being protected (e.g., 12 V rail), while the opposite (anode) terminal connects to ground. Reversing polarity renders the device ineffective for surge suppression, as forward conduction would occur at ~0.7 V instead of clamping at 12.0 V. The SMAJ7.0AHE3_A/H datasheet specifies cathode-band orientation in Figure 5 of Document Number 88390.
What is the thermal resistance and how does it affect layout for the SMAJ7.0AHE3_A/H?
The SMAJ7.0AHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal - the minimum recommended pad layout per Vishay. Exceeding this thermal resistance (e.g., via undersized pads or poor copper pour) causes junction temperature to rise rapidly during repetitive surges, potentially degrading clamping performance or shortening lifetime. For high-duty-cycle applications, designers should verify thermal margin using the SMAJ7.0AHE3_A/H's 3.3 W steady-state power dissipation rating and derating curve in Figure 2.
SMAJ7.0AHE3_A/H 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):
- 7V
- Voltage - Breakdown (Min):
- 7.78V
- Voltage - Clamping (Max) @ Ipp:
- 12V
- Current - Peak Pulse (10/1000µs):
- 33.3A
- 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)
SMAJ7.0AHE3_A/H FAQ
1.How can I place an order for SMAJ7.0AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.0AHE3_A/H 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 SMAJ7.0AHE3_A/H reliable?
The price and inventory of SMAJ7.0AHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.0AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ7.0AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.0AHE3_A/H?
SMAJ7.0AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.0AHE3_A/H 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 SMAJ7.0AHE3_A/H?
For technical support, including SMAJ7.0AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0AHE3_A/H requirements.
6.How does Aetrix verify that SMAJ7.0AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ7.0AHE3_A/H 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 SMAJ7.0AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ7.0AHE3_A/H?
All SMAJ7.0AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0AHE3_A/H, 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 SMAJ7.0AHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ7.0AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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