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Vishay General Semiconductor - Diodes Division SMAJ7.0AHM3_A/H
- Part No.:
- SMAJ7.0AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.0AHM3_A/H.pdf
- Description:
- TVS DIODE 7VWM 12VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ7.0AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount 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 - ideal for safeguarding MOSFETs, ICs, and sensor interfaces against ESD and inductive switching transients.
For engineers reviewing the SMAJ7.0AHM3_A/H datasheet, SMAJ7.0AHM3_A/H pinout, SMAJ7.0AHM3_A/H application, or SMAJ7.0AHM3_A/H equivalent, this part delivers verified AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, and MSL Level 1 moisture sensitivity - critical for automotive, industrial, and high-reliability embedded designs requiring stable surge immunity without layout rework.
Technical Context
This TVS diode operates as a clamping device: under normal bias it presents high impedance (<1 μA leakage at 7.0 V), then rapidly transitions to low-impedance conduction when reverse voltage exceeds VBR, limiting transient energy by diverting surge current to ground. Its glass-passivated junction ensures consistent avalanche behavior and fast response time (<1 ns), while the SMA package supports automated SMT placement and meets UL 94 V-0 flammability requirements.
The SMAJ7.0AHM3_A/H is rated for -55 °C to +150 °C operating junction temperature, with thermal resistance RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 30 °C/W. It sustains 40 A non-repetitive forward surge current (8.3 ms half-sine) and exhibits a positive VBR temperature coefficient of +0.065 %/°C - enabling predictable performance across automotive thermal profiles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - Maximum continuous reverse working voltage before significant leakage; sets safe operating margin below system rail voltage. |
| VBR (min/max) | 7.78 V / 8.60 V at 10 mA - Confirmed breakdown threshold defining turn-on precision and consistency across production lots. |
| VC @ IPPM | 12.0 V at 33.3 A - Clamped voltage during 400 W transient; determines maximum stress imposed on protected downstream circuitry. |
| PPPM | 400 W (10/1000 μs) - Peak surge energy handling capacity; sufficient for ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 Level 3 events. |
| IFSM | 40 A (8.3 ms half-sine) - Forward surge rating confirming robustness against accidental polarity reversal or inrush events. |
| TJ max | +150 °C - Junction temperature limit enabling use in under-hood automotive environments and thermally constrained PCBs. |
| Package | SMA (DO-214AC) - Standardized 2-pin surface-mount outline with cathode band marking; compatible with JEDEC MS-013 and IPC-7351B footprints. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 (peak reflow 260 °C), UL 94 V-0 rated compound. Cathode indicated by band on body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when VREV > VBR; must be routed with low-inductance path to chassis or power ground. |
| Anode (unbanded end) | Reference/ground return | Typically tied to system ground plane; forms low-impedance return path essential for effective clamping performance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including HTOL, TC, UHAST, and ESD testing - enables direct use in ADAS, body control, and infotainment modules. |
| Halogen-free & RoHS-compliant | Meets JESD201 Class 2 whisker resistance and global environmental regulations - supports sustainable manufacturing and export compliance. |
| 400 W peak pulse power (10/1000 μs) | Provides robust protection against common board-level transients without derating below 78 V - eliminates need for cascaded protection stages. |
| Low clamping ratio (VC/VBR ≈ 1.44) | Minimizes voltage overshoot during clamping - preserves timing margins and logic integrity in 3.3 V/5 V digital interfaces. |
| Fast response time (<1 ns) | Engages before sensitive components experience damaging overvoltage - critical for protecting high-speed data lines and microcontroller I/O pins. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients per ISO 7637-2. IC Role / Device Role / Timing Role: Primary clamping element placed directly at connector entry point to shunt surges before reaching LDOs and MCU power inputs. Use Value: Withstands 400 W pulses and operates up to +150 °C junction temperature - ensures uninterrupted function during engine start-stop cycles and under-hood thermal stress. |
Use Scenario: Shielding 4–20 mA current loop transmitters and analog sensor outputs from ESD and field wiring faults. IC Role / Device Role / Timing Role: Unidirectional TVS connected between signal line and ground to clamp negative transients while preserving DC bias integrity. Use Value: 7.0 V VWM allows compatibility with 5 V or 12 V sensor supply rails; 12.0 V VC prevents damage to op-amps and ADC front-ends. |
| Consumer Device USB Port Protection | Telecom Line Card Surge Suppression |
|
Use Scenario: Adding secondary-level surge immunity to USB 2.0 VBUS and D+/D− lines in portable chargers and docking stations. IC Role / Device Role / Timing Role: Standalone TVS placed upstream of USB switch ICs and ESD diodes to absorb high-energy coupling events from AC adapters. Use Value: SMA package enables compact placement near connectors; 400 W rating exceeds IEC 61000-4-5 Level 3 (1 kV/42 Ω) requirements. |
Use Scenario: Front-end protection of Ethernet PHYs and DSL line drivers exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-stage clamping device on differential pair inputs, coordinated with gas discharge tubes for multi-stage defense. Use Value: Low incremental surge resistance and fast response ensure minimal let-through energy to downstream protection ICs and PHY transceivers. |
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/H | Same electrical specs but RoHS-compliant commercial grade (E3); lacks AEC-Q101 qualification and halogen-free certification. | Approved for consumer/industrial use only; not certified for automotive production. | Select when AEC-Q101 and halogen-free requirements are not mandated; lower cost alternative for non-automotive BOMs. |
| SMBJ7.0A-HM3 | Higher 600 W PPPM rating, same VWM/VC, larger SMB (DO-214AA) package - 2.5× higher thermal mass and 20 % larger footprint. | Better suited for high-energy industrial motor drives where 400 W is marginal; requires PCB layout change. | Choose when surge threat level exceeds 400 W or when thermal dissipation demands larger package; verify pad layout compatibility. |
Compared with SMAJ7.0AHE3_A/H, the SMAJ7.0AHM3_A/H adds AEC-Q101 qualification and halogen-free compliance for automotive use; versus SMBJ7.0A-HM3, it trades 200 W extra surge capacity for smaller SMA footprint and tighter board space constraints.
Availability
SMAJ7.0AHM3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom infrastructure requiring stable component supply with guaranteed long-term continuity and traceable sourcing.
Supply support for SMAJ7.0AHM3_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 robust transient suppression in harsh environments - targeting automotive, industrial, and communications systems where failure due to voltage surges must be eliminated at the component level.
FAQ
What is the clamping voltage of the SMAJ7.0AHM3_A/H under a 33.3 A transient?
The SMAJ7.0AHM3_A/H has a maximum clamping voltage (VC) of 12.0 V when subjected to its rated peak pulse current of 33.3 A with a 10/1000 μs waveform. This value is measured per standard test conditions in the Vishay datasheet (Document Number: 88390, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ7.0AHM3_A/H maintains this clamping performance across its full operating temperature range.
Is the SMAJ7.0AHM3_A/H suitable for automotive applications?
Yes, the SMAJ7.0AHM3_A/H is AEC-Q101 qualified (denoted by the HM3 suffix) and specifically designed for automotive use. It undergoes rigorous stress testing including high-temperature operating life, temperature cycling, and unbiased HAST to ensure reliability in under-hood and cabin environments. The SMAJ7.0AHM3_A/H is approved for use in ECUs, ADAS sensors, lighting modules, and infotainment systems where transient immunity and long-term stability are mandatory.
What does the "HM3" suffix indicate in SMAJ7.0AHM3_A/H?
The "HM3" suffix in SMAJ7.0AHM3_A/H signifies halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade versions (e.g., E3) and confirms compliance with automotive reliability standards, JESD201 Class 2 whisker resistance, and UL 94 V-0 flammability rating. The "_A/H" denotes packaging: 7-inch tape-and-reel, 1800 units per reel - a standard logistics configuration for SMT production.
How does the SMAJ7.0AHM3_A/H compare to bidirectional TVS diodes like SMAJ7.0CA?
The SMAJ7.0AHM3_A/H is unidirectional and intended for DC line protection where polarity is fixed (e.g., VBUS, 12 V rail), offering lower leakage and sharper clamping onset. In contrast, SMAJ7.0CA is bidirectional and used for AC or floating signal lines (e.g., RS-485, audio). They share identical VWM (7.0 V) and VC (12.0 V), but SMAJ7.0AHM3_A/H has a defined cathode band and cannot suppress positive transients on grounded lines - correct polarity orientation is essential for proper operation of the SMAJ7.0AHM3_A/H.
What is the maximum junction temperature rating for the SMAJ7.0AHM3_A/H?
The SMAJ7.0AHM3_A/H has a maximum junction temperature (TJ) rating of +150 °C, as specified in the Vishay datasheet. This allows reliable operation in high-ambient environments such as automotive engine compartments or enclosed industrial enclosures. Derating curves in Figure 2 of Document 88390 show that its 400 W peak pulse power capability decreases linearly above 25 °C ambient, maintaining functional integrity up to the TJ limit - a key design parameter confirmed for the SMAJ7.0AHM3_A/H.
SMAJ7.0AHM3_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:
- 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/H FAQ
1.How can I place an order for SMAJ7.0AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.0AHM3_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 SMAJ7.0AHM3_A/H reliable?
The price and inventory of SMAJ7.0AHM3_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 SMAJ7.0AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ7.0AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.0AHM3_A/H?
SMAJ7.0AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.0AHM3_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 SMAJ7.0AHM3_A/H?
For technical support, including SMAJ7.0AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0AHM3_A/H requirements.
6.How does Aetrix verify that SMAJ7.0AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ7.0AHM3_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 SMAJ7.0AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ7.0AHM3_A/H?
All SMAJ7.0AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0AHM3_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 SMAJ7.0AHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ7.0AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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