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Vishay General Semiconductor - Diodes Division SMAJ7.0AHE3/61
- Part No.:
- SMAJ7.0AHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.0AHE3/61.pdf
- Description:
- TVS DIODE 7VWM 12VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,502
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Product details
Overview
SMAJ7.0AHE3/61 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for primary overvoltage protection of DC power rails 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 - used to safeguard MOSFETs, ICs, and sensor interfaces against ESD and inductive switching transients in automotive and industrial control systems.
For engineers reviewing the SMAJ7.0AHE3/61 datasheet, SMAJ7.0AHE3/61 pinout, SMAJ7.0AHE3/61 application, or SMAJ7.0AHE3/61 equivalent, key selection criteria include its AEC-Q101 qualification, low clamping ratio (VC/VWM = 1.71), 0.065 %/°C temperature coefficient of VBR, and compatibility with automated SMT placement on standard PCB pad layouts per JEDEC DO-214AC footprint.
Technical Context
The SMAJ7.0AHE3/61 operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds VBR to clamp transient energy into ground. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<800 μA at 7.0 V), while the SMA package provides thermal resistance of 120 °C/W (junction-to-ambient) and supports 40 A non-repetitive surge current (8.3 ms half-sine).
Designed for single-event transient suppression-not continuous regulation-it delivers sub-nanosecond response time and maintains clamping performance across -55 °C to +150 °C operating junction temperature. The HE3 suffix confirms RoHS-compliance and AEC-Q101 qualification, enabling use in automotive powertrain and body electronics where reliability under thermal cycling and humidity is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - Maximum continuous reverse operating voltage before conduction begins; sets safe margin below system rail (e.g., 5 V or 12 V logic supply) |
| VBR @ IT = 10 mA | 7.78–8.60 V - Verified avalanche onset range; ensures predictable turn-on during fast transients without premature leakage |
| VC @ IPPM = 33.3 A | 12.0 V - Clamped voltage during 10/1000 μs surge; limits downstream device stress to ≤12 V under worst-case 400 W event |
| PPPM | 400 W - Peak pulse power handling capability; sufficient for ISO 7637-2 Pulse 1/2a/5a automotive transients and IEC 61000-4-5 Level 3 surges |
| IFSM | 40 A - Single half-sine surge rating (8.3 ms); supports robustness against motor commutation spikes and relay bounce |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and sealed industrial enclosures |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal relief; MSL Level 1 compliant (260 °C peak reflow) |
Pinout & Package
SMAJ7.0AHE3/61 uses the SMA (DO-214AC) package: molded plastic case with matte tin-plated leads, cathode indicated by a band on the body. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path / Ground reference | Connected to system ground or low-side return; completes clamping path during reverse transient |
| Cathode | Protected line input / High-side connection | Connected to the line being protected (e.g., 12 V battery feed or sensor output); carries surge current into anode during clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including powertrain, chassis, and ADAS subsystems per stress test requirements |
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients common in 12 V/24 V vehicle electrical systems without degradation |
| Clamping ratio VC/VWM = 1.71 | Minimizes overvoltage exposure to protected ICs-critical for 5 V or 3.3 V logic interfaces with tight absolute maximum ratings |
| Glass passivated junction | Ensures long-term stability of VBR and low leakage drift over temperature and lifetime |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppressing load dump and alternator ripple transients on 12 V battery-fed ECUs in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and LDO input to clamp spikes up to 35 V within nanoseconds. Use Value: Prevents latch-up or gate oxide damage in downstream PMICs and microcontrollers during ISO 7637-2 Pulse 5a events. |
Use Scenario: Protecting analog outputs of pressure/temperature sensors connected to PLC analog input modules. IC Role / Device Role / Timing Role: TVS mounted at sensor connector to shunt induced lightning-induced surges on 4–20 mA or 0–10 V lines. Use Value: Maintains signal integrity by limiting transient overvoltage to <12 V, avoiding ADC saturation or op-amp input stage failure. |
| Consumer Power Adapter Input Stage | Motor Drive Gate Driver Protection |
|
Use Scenario: Safeguarding AC-DC adapter primary-side controllers against surge coupling from mains input. IC Role / Device Role / Timing Role: Placed across bulk capacitor terminals to clamp differential-mode surges before they reach PWM controller. Use Value: Enables compliance with IEC 61000-4-5 Level 3 (2 kV line-earth) without adding MOVs or complex filtering. |
Use Scenario: Shielding high-side gate drivers in BLDC inverters from shoot-through-inducing voltage spikes during MOSFET switching. IC Role / Device Role / Timing Role: Connected between gate and source of power MOSFETs to clamp Miller-induced dv/dt overshoot. Use Value: Reduces false triggering risk and extends gate oxide life by limiting gate-source voltage to ≤12 V during fast switching transitions. |
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 | No AEC-Q101 qualification; commercial-grade only; identical electrical specs and package | Restricted to non-automotive industrial or consumer applications where automotive reliability testing is not required | Select when cost sensitivity outweighs automotive qualification needs and thermal cycling/lifetime validation is not mandated |
| SMAJ7.0CAHE3/61 | Bidirectional variant; symmetric VBR (7.78–8.60 V) in both polarities; same VC and PPPM | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal may occur | Choose only if bidirectional clamping is essential; unidirectional SMAJ7.0AHE3/61 offers lower leakage and better DC rail protection efficiency |
Compared with SMAJ7.0A-E3/61, the SMAJ7.0AHE3/61 adds automotive-grade reliability without sacrificing clamping performance; versus SMAJ7.0CAHE3/61, it provides superior leakage control and optimized forward conduction path for DC power line protection.
Availability
SMAJ7.0AHE3/61 is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and consumer power adapter certification requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ7.0AHE3/61 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, precision, and application-specific optimization.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure modes must be mitigated without compromising signal fidelity or power efficiency.
FAQ
What is the clamping voltage of SMAJ7.0AHE3/61 at its rated peak pulse current?
The SMAJ7.0AHE3/61 has a maximum clamping voltage (VC) of 12.0 V at 33.3 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is measured per ANSI/IEEE C62.35 standards and guarantees that protected circuitry sees no more than 12.0 V during a 400 W transient event. The clamping performance is validated across -55 °C to +150 °C junction temperature range.
Is SMAJ7.0AHE3/61 suitable for automotive applications?
Yes, SMAJ7.0AHE3/61 is AEC-Q101 qualified, confirming its suitability for automotive applications including engine control units, body electronics, and ADAS sensors. The HE3 suffix explicitly denotes RoHS-compliant and AEC-Q101-qualified construction, with testing covering temperature cycling, humidity bias, and mechanical shock per automotive reliability standards.
How does the breakdown voltage tolerance of SMAJ7.0AHE3/61 affect circuit design?
SMAJ7.0AHE3/61 specifies a breakdown voltage (VBR) range of 7.78 V to 8.60 V at 10 mA test current. This ±5.3% tolerance requires designers to ensure system operating voltage remains below the minimum VBR (7.78 V) with margin - for example, using it on a nominal 7.0 V rail leaves 0.78 V headroom before conduction, preventing false triggering during normal operation.
What is the thermal resistance of SMAJ7.0AHE3/61, and how does it impact PCB layout?
The SMAJ7.0AHE3/61 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. To maintain safe junction temperature under sustained power dissipation, PCB layout must replicate this pad area and avoid excessive trace length or isolation - otherwise, thermal derating becomes necessary per Figure 2 in the Vishay datasheet 88390.
Can SMAJ7.0AHE3/61 replace SMAJ6.5AHE3/61 in an existing design?
SMAJ7.0AHE3/61 is not a direct replacement for SMAJ6.5AHE3/61 due to higher VWM (7.0 V vs. 6.5 V) and VBR (7.78–8.60 V vs. 7.22–7.98 V). Substituting it may reduce protection margin on 5 V or 6 V rails, risking inadequate clamping during low-voltage transients. Verify system rail tolerances and transient amplitude profiles before interchange - the SMAJ7.0AHE3/61 is intended for 7 V nominal applications.
SMAJ7.0AHE3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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)
SMAJ7.0AHE3/61 FAQ
1.How can I place an order for SMAJ7.0AHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.0AHE3/61 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 SMAJ7.0AHE3/61 reliable?
The price and inventory of SMAJ7.0AHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.0AHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ7.0AHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0AHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.0AHE3/61?
SMAJ7.0AHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.0AHE3/61 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 SMAJ7.0AHE3/61?
For technical support, including SMAJ7.0AHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0AHE3/61 requirements.
6.How does Aetrix verify that SMAJ7.0AHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ7.0AHE3/61 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 SMAJ7.0AHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ7.0AHE3/61?
All SMAJ7.0AHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0AHE3/61, 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 SMAJ7.0AHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ7.0AHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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