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Vishay General Semiconductor - Diodes Division SMAJ8.5AHM3/I
- Part No.:
- SMAJ8.5AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.5AHM3/I.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,659
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Product details
Overview
SMAJ8.5AHM3/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 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 14.4 V maximum clamping voltage (VC) at 27.8 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ8.5AHM3/I datasheet, SMAJ8.5AHM3/I pinout, SMAJ8.5AHM3/I application, or SMAJ8.5AHM3/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, 120 °C/W junction-to-ambient thermal resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a clamping device that remains non-conductive below its 8.5 V stand-off voltage and rapidly transitions to low-impedance conduction when transient voltages exceed its 9.44–10.4 V breakdown range. Its glass-passivated junction ensures stable leakage performance (<10 μA at VWM) and fast response time (<1.0 ps).
The SMAJ8.5AHM3/I delivers 400 W peak pulse power handling (derated to 300 W above 78 V), supports 40 A non-repetitive forward surge current (8.3 ms half-sine), and maintains operation across –55 °C to +150 °C junction temperature range with MSL Level 1 moisture sensitivity rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 9.44 V / 10.4 V at 1 mA - Confirmed breakdown threshold defining turn-on consistency |
| VC @ IPPM | 14.4 V at 27.8 A - Clamped voltage during 10/1000 μs transient, limiting downstream stress |
| PPPM | 400 W (10/1000 μs) - Surge energy absorption capacity under standard test waveform |
| ID @ VWM | <10 μA - Low leakage preserves signal integrity and minimizes standby power loss |
| RθJA | 120 °C/W - Thermal resistance indicating need for adequate PCB copper area for power dissipation |
| Polarity | Unidirectional - Cathode marked by band; blocks reverse current until breakdown |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102. Polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to lower-potential side of protected line; defines directionality of clamping |
| Cathode | Clamping output / Surge current sink | Marked with band; ties to higher-potential rail or ground return path to shunt transients |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use including engine control units and ADAS sensor interfaces |
| 400 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) without degradation |
| Low incremental surge resistance | Enables tight clamping window (VC − VBR ≈ 4.0 V), minimizing overvoltage exposure to protected ICs |
| MSL Level 1 rating | Allows unlimited floor life and reflow at peak 260 °C without baking preconditioning |
| Glass passivated junction | Ensures stable VBR and ID over temperature and lifetime, critical for long-term reliability in industrial environments |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-supplied microcontrollers and CAN transceivers from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and ground to clamp positive transients up to 400 W. Use Value: Limits voltage seen by downstream regulators to ≤14.4 V during 27.8 A surge, preventing latch-up or gate oxide damage. | Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC analog input modules. IC Role / Device Role / Timing Role: TVS mounted at sensor connector to absorb ESD and switching noise induced on 4–20 mA loop wiring. Use Value: Sub-10 μA leakage avoids loading precision current loops; 14.4 V clamping prevents ADC input saturation during 8 kV contact ESD events. |
| Consumer Power Adapter Input Stage | Motor Drive Gate Driver Protection |
Use Scenario: Secondary-side DC bus protection in USB-C PD adapters against flyback overshoot and hot-plug transients. IC Role / Device Role / Timing Role: Unidirectional clamping device across +5 V/9 V/15 V output rails to ground. Use Value: Fast response (<1 ps) and low clamping ratio (VC/VBR ≈ 1.45) maintain regulated output stability during repetitive 10/1000 μs surges. | Use Scenario: Shielding high-side and low-side MOSFET gate drivers from Miller-induced voltage spikes in BLDC inverters. IC Role / Device Role / Timing Role: TVS placed between gate and source terminals to clamp dv/dt-induced ringing exceeding VGS(max). Use Value: 14.4 V VC ensures gate oxide remains within ±20 V absolute max rating even during 27.8 A transient coupling events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5AHE3/I | Same electrical specs; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification | Restricted to commercial-grade industrial or consumer use; not approved for automotive ECUs | Select when cost sensitivity outweighs automotive qualification requirements |
| SMBJ8.5A-M3/5A | Higher 600 W PPPM rating; larger SMB (DO-214AA) package; same VWM/VBR/VC | Requires PCB layout change due to 2.54 mm lead pitch vs. SMA's 2.29 mm; better thermal dissipation | Choose when system-level surge testing exceeds 400 W or board space allows larger footprint |
Compared with SMAJ8.5AHM3/I, SMAJ8.5AHE3/I offers identical clamping performance but no automotive qualification, while SMBJ8.5A-M3/5A provides higher surge margin at the cost of larger footprint and revised layout-making SMAJ8.5AHM3/I optimal for space-constrained AEC-Q101-compliant designs.
Availability
SMAJ8.5AHM3/I is available at Aetrix Electronics and suitable for automotive control units, industrial sensor interfaces, and consumer power adapter designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ8.5AHM3/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The SMAJ series is engineered for robust transient suppression in harsh environments-targeting automotive, industrial, and telecom systems where AEC-Q101 compliance, low leakage, and precise clamping are mandatory design requirements.
FAQ
What is the clamping voltage of SMAJ8.5AHM3/I at its rated peak pulse current?
The SMAJ8.5AHM3/I has a maximum clamping voltage (VC) of 14.4 V at its rated peak pulse current (IPPM) of 27.8 A, measured under the standardized 10/1000 μs double-exponential waveform. This value ensures protected circuitry remains within safe operating limits during transient events. The SMAJ8.5AHM3/I achieves this with low incremental surge resistance and a tightly controlled breakdown range of 9.44–10.4 V.
Is SMAJ8.5AHM3/I qualified for automotive applications?
Yes, SMAJ8.5AHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" (halogen-free, RoHS-compliant, AEC-Q101 qualified). It is approved for use in automotive electronic control units, body electronics, and ADAS sensor modules where reliability under temperature cycling, humidity, and mechanical shock is required. The SMAJ8.5AHM3/I meets all stress test conditions defined in the AEC-Q101 standard.
What is the maximum reverse leakage current of SMAJ8.5AHM3/I at its stand-off voltage?
The SMAJ8.5AHM3/I exhibits a maximum reverse leakage current (ID) of 10 μA at its 8.5 V stand-off voltage (VWM), tested at TA = 25 °C. This low leakage preserves signal integrity in high-impedance sensor interfaces and minimizes power loss in always-on automotive subsystems. The SMAJ8.5AHM3/I maintains this specification across its full operating temperature range due to its glass-passivated junction construction.
Does SMAJ8.5AHM3/I have moisture sensitivity level (MSL) rating, and what does it mean for assembly?
SMAJ8.5AHM3/I is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and can withstand reflow soldering at a peak temperature of 260 °C without preconditioning bake. This eliminates moisture-related popcorning risk during SMT assembly and simplifies manufacturing logistics. The SMAJ8.5AHM3/I's DO-214AC package and molding compound meet UL 94 V-0 flammability requirements, supporting high-yield automated placement.
How does the thermal resistance of SMAJ8.5AHM3/I affect PCB layout design?
The SMAJ8.5AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To sustain repeated 400 W surges, designers must allocate sufficient copper area and consider thermal vias-especially in enclosed automotive or industrial enclosures. The SMAJ8.5AHM3/I's RθJL of 30 °C/W indicates efficient heat transfer to PCB traces, making pad size and copper weight critical layout parameters.
SMAJ8.5AHM3/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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 27.8A
- 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)
SMAJ8.5AHM3/I FAQ
1.How can I place an order for SMAJ8.5AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.5AHM3/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 SMAJ8.5AHM3/I reliable?
The price and inventory of SMAJ8.5AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.5AHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ8.5AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.5AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.5AHM3/I?
SMAJ8.5AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.5AHM3/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 SMAJ8.5AHM3/I?
For technical support, including SMAJ8.5AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.5AHM3/I requirements.
6.How does Aetrix verify that SMAJ8.5AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ8.5AHM3/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 SMAJ8.5AHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ8.5AHM3/I?
All SMAJ8.5AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.5AHM3/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 SMAJ8.5AHM3/I part is unused and in its original packaging.
Return procedure for SMAJ8.5AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ8.5AHM3/I Tags
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