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Vishay General Semiconductor - Diodes Division SMAJ8.0AHM3/I
- Part No.:
- SMAJ8.0AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.0AHM3/I.pdf
- Description:
- TVS DIODE 8VWM 13.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,221
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Product details
Overview
SMAJ8.0AHM3/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 8.0 V stand-off voltage (VWM), 8.89–9.83 V breakdown voltage (VBR) at 10 mA, 13.6 V maximum clamping voltage (VC) at 29.4 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), commonly deployed to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ8.0AHM3/I datasheet, SMAJ8.0AHM3/I pinout, SMAJ8.0AHM3/I application, or SMAJ8.0AHM3/I equivalent, key selection criteria include its unidirectional polarity, AEC-Q101 qualification (via HM3 suffix), halogen-free RoHS compliance, 150 °C max junction temperature, and suitability for inductive load switching surge suppression in 12 V rail protection and ESD-sensitive analog front-ends.
Technical Context
This TVS diode operates as a fast-acting shunt clamp, responding in <1 ps to transient overvoltages while maintaining low incremental surge resistance. Its glass-passivated junction ensures stable breakdown characteristics and repeatable clamping performance under repetitive 10/1000 μs surges at 0.01 % duty cycle.
The device is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), supports operation from –55 °C to +150 °C, and exhibits a positive temperature coefficient of VBR (+0.069 %/°C), enabling predictable voltage drift across temperature ranges in automotive under-hood environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC bias margin for 12 V system rails. |
| VBR min/max | 8.89 V / 9.83 V at IT = 10 mA - Confirmed breakdown range ensures reliable turn-on without premature conduction during normal operation. |
| VC @ IPPM | 13.6 V at 29.4 A - Clamping voltage limits downstream component stress during 400 W transient events (10/1000 μs). |
| PPPM | 400 W - Peak pulse power rating with standardized waveform; derates to 300 W above 78 V, but fully applicable at 8.0 V rating. |
| ID @ VWM | 50 μA - Low reverse leakage preserves efficiency in battery-powered or low-quiescent circuits. |
| TJ max | +150 °C - Enables use in high-temperature automotive engine control units and industrial motor drives without thermal derating. |
| Package | SMA (DO-214AC) - Surface-mount footprint compatible with automated assembly; meets MSL Level 1, LF peak 260 °C. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to lower-potential side of protected line (e.g., GND or return path) | Enables unidirectional clamping from cathode to anode; must be tied to reference plane matching system ground topology. |
| Cathode | Current exit terminal in forward bias; marked with band; connected to higher-potential side (e.g., 12 V rail or signal line) | Defines clamping direction: transients exceeding VBR cause avalanche conduction from cathode to anode, diverting surge current to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors per stress test requirements. |
| Halogen-free & RoHS-compliant | HM3 suffix confirms full compliance with IEC 61249-2-21 and JEDEC J-STD-20D, supporting green manufacturing and end-of-life recycling. |
| 400 W peak pulse power | Handles ISO 7637-2 Pulse 1/2a/5a transients and IEC 61000-4-5 surge events without degradation when mounted per recommended pad layout. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage overshoot during clamping-critical for protecting 5 V or 3.3 V logic interfaces downstream of 12 V supply rails. |
| Fast response time (<1 ps) | Clamps before transient energy couples into sensitive circuitry, preventing latch-up or gate oxide damage in MOSFETs and microcontrollers. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppressing load dump and alternator ripple transients on 12 V battery-fed ECUs and lighting modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and local regulator input to clamp spikes up to ±100 V. Use Value: Prevents regulator IC failure and maintains MCU uptime during cold-crank and jump-start conditions per ISO 16750-2. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: TVS located at connector interface to absorb 8 kV HBM ESD pulses before reaching ADC input or op-amp buffer. Use Value: Eliminates field returns due to sensor drift or calibration loss caused by transient-induced latch-up in signal conditioning stages. |
| Consumer Power Adapter Input Stage | MOSFET Gate Driver Protection |
|
Use Scenario: Protecting AC-DC adapter primary-side controllers from lightning-induced surges entering via mains input. IC Role / Device Role / Timing Role: TVS placed across bridge rectifier output to clamp differential-mode transients before bulk capacitor and controller IC. Use Value: Extends adapter lifetime in regions with unstable grid infrastructure by limiting voltage stress on PWM controller and MOSFET drain. |
Use Scenario: Safeguarding high-side N-channel MOSFET gate drivers in half-bridge motor controllers from shoot-through-inducing voltage spikes. IC Role / Device Role / Timing Role: TVS installed between gate and source to clamp Miller-induced ringing and prevent unintended turn-on. Use Value: Reduces gate oxide stress and improves reliability of 48 V BLDC drives in e-bikes and power tools. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.0AHE3/I | Same electrical specs, but RoHS-compliant commercial grade (E3) without halogen-free certification; no AEC-Q101 qualification. | Lacks automotive qualification; suitable only for consumer or industrial non-automotive designs requiring cost optimization. | Select SMAJ8.0AHE3/I only if halogen-free content and AEC-Q101 are not mandated by end-equipment standards. |
| SMBJ8.0A-M3 | Higher 600 W PPPM rating in larger SMB (DO-214AA) package; identical VWM/VBR/VC but 43.5 A IPPM and 15.4 V VC. | Better surge handling for harsher environments (e.g., telecom base stations), but requires PCB layout change due to larger footprint. | Choose SMBJ8.0A-M3 when system-level surge testing exceeds IEC 61000-4-5 Level 4 and board space permits larger package. |
Compared with SMAJ8.0AHM3/I, SMAJ8.0AHE3/I trades halogen-free compliance and automotive qualification for lower cost, while SMBJ8.0A-M3 delivers higher surge robustness at the expense of footprint size-making SMAJ8.0AHM3/I optimal for space-constrained AEC-Q101-compliant automotive modules where 400 W clamping suffices.
Availability
SMAJ8.0AHM3/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor nodes, and consumer power adapters requiring stable component supply with halogen-free and AEC-Q101-compliant transient protection.
Supply support for SMAJ8.0AHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade validation.
The SMAJ series was engineered specifically for robust, surface-mount transient suppression in automotive and industrial environments-balancing low clamping voltage, fast response, and AEC-Q101 compliance in compact SMA packages.
FAQ
What does the "HM3" suffix mean in SMAJ8.0AHM3/I?
The "HM3" suffix in SMAJ8.0AHM3/I indicates halogen-free, RoHS-compliant construction and AEC-Q101 qualification. It confirms compliance with JEDEC J-STD-20D moisture sensitivity level 1, lead-free solderability per J-STD-002, and whisker resistance per JESD 201 Class 2-making SMAJ8.0AHM3/I suitable for automotive under-hood applications where material restrictions and reliability are critical.
Is SMAJ8.0AHM3/I bidirectional or unidirectional?
SMAJ8.0AHM3/I is unidirectional. Its marking band denotes the cathode terminal, and it conducts only when reverse-biased beyond its breakdown voltage. Bidirectional variants carry a "CA" suffix (e.g., SMAJ8.0CA); SMAJ8.0AHM3/I is explicitly designated for single-polarity clamping, such as protecting positive supply rails against negative-going transients.
What is the maximum clamping voltage of SMAJ8.0AHM3/I and at what current is it specified?
The maximum clamping voltage (VC) of SMAJ8.0AHM3/I is 13.6 V, measured at a peak pulse current (IPPM) of 29.4 A using the standard 10/1000 μs double-exponential waveform. This value is guaranteed across temperature and ensures downstream components see no more than 13.6 V during a 400 W transient event, provided the device is mounted per the recommended 0.2" × 0.2" copper pad layout.
Can SMAJ8.0AHM3/I replace SMAJ8.0A-E3 in an existing design?
SMAJ8.0AHM3/I can replace SMAJ8.0A-E3 electrically and mechanically-both share identical SMA (DO-214AC) package, pinout, and core electrical parameters-but SMAJ8.0AHM3/I adds halogen-free content and AEC-Q101 qualification. No PCB changes are needed; however, requalification per automotive standards is required if migrating to automotive production, as SMAJ8.0A-E3 lacks AEC-Q101 validation.
What is the junction-to-ambient thermal resistance (RθJA) of SMAJ8.0AHM3/I?
The typical junction-to-ambient thermal resistance (RθJA) of SMAJ8.0AHM3/I is 120 °C/W when mounted on the minimum recommended pad layout (0.2" × 0.2" copper pads per terminal). This value assumes still air conditions and defines the thermal rise from junction to ambient at steady-state 3.3 W power dissipation-critical for validating long-term reliability in enclosed enclosures or high-temperature ambient deployments.
SMAJ8.0AHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 8V
- Voltage - Breakdown (Min):
- 8.89V
- Voltage - Clamping (Max) @ Ipp:
- 13.6V
- Current - Peak Pulse (10/1000µs):
- 29.4A
- 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)
SMAJ8.0AHM3/I FAQ
1.How can I place an order for SMAJ8.0AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.0AHM3/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 SMAJ8.0AHM3/I reliable?
The price and inventory of SMAJ8.0AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.0AHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ8.0AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.0AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.0AHM3/I?
SMAJ8.0AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.0AHM3/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 SMAJ8.0AHM3/I?
For technical support, including SMAJ8.0AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.0AHM3/I requirements.
6.How does Aetrix verify that SMAJ8.0AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ8.0AHM3/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 SMAJ8.0AHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ8.0AHM3/I?
All SMAJ8.0AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.0AHM3/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 SMAJ8.0AHM3/I part is unused and in its original packaging.
Return procedure for SMAJ8.0AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ8.0AHM3/I Tags
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