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Vishay General Semiconductor - Diodes Division SMAJ7.0AHM3_A/I
- Part No.:
- SMAJ7.0AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.0AHM3_A/I.pdf
- Description:
- TVS DIODE 7VWM 12VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,836
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Product details
Overview
SMAJ7.0AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping 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 - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMAJ7.0AHM3_A/I datasheet, SMAJ7.0AHM3_A/I pinout, SMAJ7.0AHM3_A/I application, or SMAJ7.0AHM3_A/I equivalent, this part delivers verified AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, and MSL Level 1 moisture sensitivity - critical for high-reliability automotive ECUs and industrial control modules requiring long-term surge immunity without derating.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging a glass-passivated silicon junction for fast response (<1 ps) and low incremental surge resistance. Its thermal design relies on RθJA = 120 °C/W (on 5.0 mm × 5.0 mm copper pads) and RθJL = 30 °C/W, enabling stable operation up to TJ = +150 °C.
The SMAJ7.0AHM3_A/I is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine) and exhibits 0.065 %/°C temperature coefficient of VBR, ensuring predictable clamping behavior across automotive temperature ranges. It meets UL 497B recognition (QVGQ2) and JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin above 5 V logic or 6.5 V supply rails. |
| VBR (min/max) | 7.78 V / 8.60 V at 10 mA - Confirmed breakdown range ensures reliable turn-on during ESD or load-dump events without premature conduction. |
| VC @ IPPM | 12.0 V at 33.3 A - Clamping voltage limits downstream IC stress during 400 W transient surges (10/1000 μs), protecting 12 V tolerant inputs. |
| PPPM | 400 W - Peak pulse power handling capability supports ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 4 surge immunity testing. |
| IFSM | 40 A - Surge current rating enables robust protection against inductive switching spikes in relay drivers and motor control circuits. |
| TJ max. | +150 °C - Junction temperature limit allows deployment in under-hood automotive environments and sealed industrial enclosures. |
| Package | SMA (DO-214AC) - Standardized surface-mount footprint compatible with automated placement and reflow soldering (260 °C peak). |
Pinout & Package
Package: SMA (DO-214AC), molded epoxy case with matte tin-plated leads; cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential side (e.g., ground or return path); enables clamping when cathode-side voltage exceeds VBR. |
| Cathode | Current exit terminal during forward conduction; marked with band | Connected to protected line (e.g., 7 V rail or signal input); conducts surge current to ground when transient exceeds VWM. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive electronics per stress test requirements including HTOL, TC, UHAST - suitable for engine control, body electronics, and ADAS sensors. |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC J-STD-020 MSL Level 1 - eliminates brominated flame retardants and supports green manufacturing and end-of-life recycling. |
| 400 W peak pulse power (10/1000 μs) | Handles repetitive surge energy without degradation when duty cycle ≤ 0.01 % - ideal for infrequent but high-energy transients like load dump. |
| Low clamping ratio (VC/VBR ≈ 1.44) | Minimizes overvoltage stress on protected ICs - e.g., keeps 3.3 V or 5 V logic inputs below absolute maximum ratings during clamping. |
| Fast response time (< 1 ps) | Clamps ESD events (IEC 61000-4-2 ±8 kV contact) before damage occurs to sensitive gate oxides in MOSFETs or CMOS inputs. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppressing load-dump transients (up to 35 V, 100 ms) on 12 V battery-fed ECUs in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp overvoltage before regulator stage. Use Value: Prevents latch-up or burnout of buck controller ICs by limiting input voltage to ≤12.0 V during 400 W surges. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) from EFT bursts in factory-floor PLC I/O modules. IC Role / Device Role / Timing Role: TVS connected across signal and ground near connector to divert fast transients before reaching op-amp or ADC front-end. Use Value: Maintains signal integrity by clamping sub-100 ns EFT pulses to <12 V, avoiding ADC saturation or DAC offset drift. |
| Consumer Power Adapter Input Stage | MOSFET Gate Driver Protection |
|
Use Scenario: Protecting primary-side controller ICs in universal-input AC/DC adapters against surge coupling from mains. IC Role / Device Role / Timing Role: TVS installed across bulk capacitor terminals to absorb line-to-line or line-to-ground surges per IEC 61000-4-5. Use Value: Extends adapter lifetime by preventing repeated overstress of PWM controllers during lightning-induced surges. |
Use Scenario: Safeguarding high-side N-channel MOSFET gates driven by level-shifted signals in half-bridge motor drivers. IC Role / Device Role / Timing Role: TVS placed between gate and source to clamp Miller-induced voltage spikes during switching transitions. Use Value: Avoids unintended turn-on or gate oxide rupture by limiting gate-source voltage to ≤12 V during dV/dt events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.0AHE3_A/I | Same electrical specs, but RoHS-compliant commercial grade (E3) without halogen-free certification or AEC-Q101 qualification. | Lacks automotive qualification and halogen-free assurance - suitable for consumer or industrial non-automotive designs. | Select SMAJ7.0AHE3_A/I only if AEC-Q101 and halogen-free compliance are not required. |
| SMBJ7.0A-HM3 | Higher 600 W PPPM, larger SMB (DO-214AA) package, identical VWM/VC - requires PCB layout change. | Better suited for higher-energy transients where 400 W is marginal; not drop-in due to footprint difference. | Choose SMBJ7.0A-HM3 when surge energy exceeds 400 W and board space permits larger package. |
Compared with SMAJ7.0AHM3_A/I, SMAJ7.0AHE3_A/I offers identical clamping performance but no automotive qualification, while SMBJ7.0A-HM3 provides 50 % higher surge power in a physically larger package - making SMAJ7.0AHM3_A/I the optimal balance of AEC-Q101 reliability, halogen-free compliance, and compact SMA footprint for space-constrained automotive modules.
Availability
SMAJ7.0AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and consumer power adapter input stages requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ7.0AHM3_A/I 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, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The SMAJ series was developed for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure due to voltage surges must be eliminated through proven clamping performance and qualification rigor.
FAQ
What is the clamping voltage of SMAJ7.0AHM3_A/I at its rated peak pulse current?
The SMAJ7.0AHM3_A/I 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 per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for downstream components. The SMAJ7.0AHM3_A/I maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) when mounted per recommended pad layout.
Is SMAJ7.0AHM3_A/I qualified for automotive applications?
Yes, SMAJ7.0AHM3_A/I is AEC-Q101 qualified, as confirmed by the HM3 suffix in its ordering code. This qualification covers stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing - validating its suitability for under-hood and chassis-mounted automotive electronics. The SMAJ7.0AHM3_A/I is explicitly listed in Vishay's AEC-Q101 qualified product matrix for transient suppressors.
What does the "HM3" suffix indicate in SMAJ7.0AHM3_A/I?
The "HM3" suffix in SMAJ7.0AHM3_A/I denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction. Specifically, "H" indicates halogen-free molding compound, "M3" confirms RoHS compliance per EU Directive 2011/65/EU and JESD201 Class 2 whisker resistance, and the qualification is documented in Vishay's AEC-Q101 certification reports. This distinguishes SMAJ7.0AHM3_A/I from E3 (RoHS-only) or HE3 (AEC-Q101 + RoHS, but not halogen-free) variants.
Can SMAJ7.0AHM3_A/I be used in bidirectional configurations?
No, SMAJ7.0AHM3_A/I is a unidirectional TVS diode, as indicated by the absence of "CA" in its part number and presence of cathode band marking. Bidirectional operation requires parts with "CA" suffix (e.g., SMAJ7.0CA). Using SMAJ7.0AHM3_A/I in reverse-biased configurations risks permanent breakdown or failure, since it is not characterized for symmetrical clamping in both directions. Always verify polarity during PCB layout.
What is the maximum printed circuit board pad size recommended for SMAJ7.0AHM3_A/I thermal performance?
Vishay specifies that the 400 W peak pulse power rating and thermal resistance values (RθJA = 120 °C/W) for SMAJ7.0AHM3_A/I are validated using 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Deviating from this pad size - especially reducing copper area - degrades heat dissipation and reduces surge current handling. For designs requiring higher reliability, use internal ground/power planes connected via multiple vias to maintain thermal performance consistent with SMAJ7.0AHM3_A/I datasheet conditions.
SMAJ7.0AHM3_A/I 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ7.0AHM3_A/I FAQ
1.How can I place an order for SMAJ7.0AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.0AHM3_A/I 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 SMAJ7.0AHM3_A/I reliable?
The price and inventory of SMAJ7.0AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.0AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ7.0AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.0AHM3_A/I?
SMAJ7.0AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.0AHM3_A/I 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 SMAJ7.0AHM3_A/I?
For technical support, including SMAJ7.0AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0AHM3_A/I requirements.
6.How does Aetrix verify that SMAJ7.0AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ7.0AHM3_A/I 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 SMAJ7.0AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ7.0AHM3_A/I?
All SMAJ7.0AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0AHM3_A/I, 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 SMAJ7.0AHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ7.0AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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