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Vishay General Semiconductor - Diodes Division SMAJ8.5AHE3_A/I
- Part No.:
- SMAJ8.5AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.5AHE3_A/I.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,584
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Product details
Overview
SMAJ8.5AHE3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤14.4 V at 27.8 A peak pulse current (IPPM) under 10/1000 μs waveform - ideal for safeguarding MOSFET gates, microcontroller I/O lines, and automotive sensor interfaces.
For engineers reviewing the SMAJ8.5AHE3_A/I datasheet, SMAJ8.5AHE3_A/I pinout, SMAJ8.5AHE3_A/I application, or SMAJ8.5AHE3_A/I equivalent, key selection criteria include its AEC-Q101 qualification, 400 W peak pulse power rating (10/1000 μs), low clamping ratio (VC/VBR ≈ 1.45), and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches rapidly (<1 ps response) to divert surge energy away from downstream circuitry. Its glass-passivated junction ensures stable leakage (<10 μA at VWM) and long-term reliability under repetitive transients.
Thermally, it exhibits RθJA = 120 °C/W and RθJL = 30 °C/W, enabling effective heat dissipation when mounted on 5.0 mm × 5.0 mm copper pads per terminal. The device is rated for TJ = –55 °C to +150 °C and meets MSL Level 1 (260 °C peak reflow).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before clamping begins; defines safe signal line operating margin. |
| VBR (min/max) | 9.44 V / 10.4 V at IT = 1 mA - precise avalanche onset range ensuring consistent turn-on across production lots. |
| VC @ IPPM | 14.4 V at 27.8 A - clamping voltage under 10/1000 μs surge; determines maximum stress imposed on protected ICs. |
| PPPM | 400 W - peak pulse power handling capability; supports high-energy ESD and load-switching transients. |
| ID @ VWM | ≤10 μA - ultra-low reverse leakage at rated stand-off voltage, minimizing standby power loss in battery-powered systems. |
| TJ max. | +150 °C - extended junction temperature rating enables use in under-hood automotive and industrial environments. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path (cathode-biased during clamping) | Connected to ground or low-impedance return path to sink surge current during transient events. |
| Cathode | Protected line connection point | Connected to the signal/power line requiring protection; reverse-biased during normal operation, avalanches when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against high-energy transients from inductive switching (e.g., solenoid drivers) without derating below 78 V. |
| Glass passivated chip junction | Ensures stable electrical characteristics over time and temperature, critical for long-life automotive and industrial deployments. |
| AEC-Q101 qualified (HE3 suffix) | Confirms compliance with automotive reliability standards including HTGB, H3TRB, and mechanical shock testing. |
| MSL Level 1 (260 °C peak) | Supports lead-free reflow soldering without moisture sensitivity concerns or baking requirements prior to assembly. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a), improving protection fidelity. |
Applications
| Automotive Body Control Module | Industrial PLC Digital Input |
|---|---|
|
Use Scenario: Protecting 12 V CAN/LIN bus interface circuits from load-dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between signal line and chassis ground to limit voltage excursions during ISO 16750-2 events. Use Value: Clamps to 14.4 V while sustaining 27.8 A surge, preventing damage to transceiver ICs rated for ≤16 V absolute maximum. |
Use Scenario: Safeguarding 24 V DC digital input channels in programmable logic controllers exposed to relay coil flyback. IC Role / Device Role / Timing Role: Primary overvoltage clamp on field-side input terminals, coordinated with upstream series impedance. Use Value: Responds in <1 ps to suppress 100 V/μs transients, maintaining signal integrity and reducing false triggering in high-noise factory environments. |
| Consumer Appliance Motor Driver | Automotive Cabin Sensor Interface |
|
Use Scenario: Shielding gate drivers and MCU GPIOs in BLDC motor control boards from commutation-induced spikes. IC Role / Device Role / Timing Role: Localized TVS at MOSFET source/drain nodes and microcontroller I/O pins to absorb localized inductive kickback. Use Value: Low clamping ratio (VC/VBR ≈ 1.45) limits gate-source stress to safe levels, extending MOSFET lifetime and reducing firmware fault recovery burden. |
Use Scenario: Protecting analog outputs of cabin temperature/humidity sensors connected to HVAC control units. IC Role / Device Role / Timing Role: Signal-line TVS on 3.3 V or 5 V analog output paths, placed immediately after sensor IC output buffer. Use Value: Sub-10 μA leakage at 8.5 V VWM preserves sensor accuracy and battery runtime in always-on modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5A-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade (non-AEC-Q101 qualified). | Lacks automotive qualification; suitable for consumer/industrial designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and lifecycle traceability is not required. |
| SMBJ8.5AHE3_A/I | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; higher PPPM (600 W) and lower RθJA (90 °C/W). | Better thermal performance and surge margin; requires larger PCB footprint and different pad layout. | Choose when system-level surge testing exceeds 400 W or board layout allows SMB footprint for enhanced robustness. |
Compared with SMAJ8.5AHE3_A/I, the E3/61 variant offers identical protection performance at lower cost but no automotive qualification, while the SMBJ8.5AHE3_A/I delivers higher surge capacity and thermal headroom at the expense of board space - making SMAJ8.5AHE3_A/I the optimal balance of AEC-Q101 compliance, compact size, and 400 W protection for space-constrained automotive modules.
Availability
SMAJ8.5AHE3_A/I is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC inputs, and consumer appliance motor control systems requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMAJ8.5AHE3_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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in automotive, industrial, and computing applications - delivering precise clamping, low leakage, and AEC-Q101 validation in compact surface-mount packages.
FAQ
What is the clamping voltage of SMAJ8.5AHE3_A/I at its rated peak pulse current?
The SMAJ8.5AHE3_A/I clamps to a maximum of 14.4 V at its specified peak pulse current (IPPM) of 27.8 A under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and reflects the actual voltage seen by protected circuitry during worst-case surge events - a critical parameter for ensuring downstream ICs remain within their absolute maximum ratings. The SMAJ8.5AHE3_A/I achieves this with a clamping ratio (VC/VBR) of approximately 1.45, indicating efficient voltage limiting behavior.
Is SMAJ8.5AHE3_A/I suitable for automotive applications?
Yes, SMAJ8.5AHE3_A/I is explicitly AEC-Q101 qualified, as confirmed by the "HE3" suffix and Vishay documentation. It undergoes rigorous stress testing including high-temperature reverse bias (HTRB), temperature cycling, and unbiased highly accelerated stress testing (uHAST) to meet automotive reliability standards. The SMAJ8.5AHE3_A/I is commonly deployed in body control modules, sensor interfaces, and infotainment power rails where sustained operation from –40 °C to +125 °C ambient is required.
What does the "_A/I" suffix indicate in SMAJ8.5AHE3_A/I?
The "_A/I" suffix in SMAJ8.5AHE3_A/I denotes the packaging configuration: "I" specifies 7500 units per 13-inch diameter plastic tape-and-reel, while "A" indicates the revision code (Revision A). This ordering code aligns with Vishay's standardized nomenclature for AEC-Q101-qualified parts in bulk tape-and-reel format, ensuring traceability and compliance with automotive logistics requirements. The SMAJ8.5AHE3_A/I is supplied with full lot-level documentation and material declarations per IATF 16949 protocols.
How does SMAJ8.5AHE3_A/I compare to bidirectional TVS diodes like SMAJ8.5CA?
SMAJ8.5AHE3_A/I is unidirectional and intended for DC-coupled lines referenced to ground, whereas SMAJ8.5CA is bidirectional and suited for AC or floating signal paths. The SMAJ8.5AHE3_A/I has asymmetric conduction (forward voltage ~3.5 V at 25 A), while SMAJ8.5CA clamps equally in both directions. For 12 V automotive power rails or microcontroller I/O lines tied to ground, SMAJ8.5AHE3_A/I provides lower leakage and tighter VBR tolerance - making it the preferred choice unless true bidirectional protection is required.
What is the thermal resistance of SMAJ8.5AHE3_A/I, and how does it affect PCB layout?
The SMAJ8.5AHE3_A/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 maintain safe junction temperatures under repetitive surges, PCB layout must provide adequate copper area and avoid thermal isolation. Reducing pad size or omitting thermal vias increases RθJA, potentially causing premature thermal runaway. The SMAJ8.5AHE3_A/I's RθJL of 30 °C/W further emphasizes the importance of solid lead-to-plane connections for heat extraction.
SMAJ8.5AHE3_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):
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ8.5AHE3_A/I FAQ
1.How can I place an order for SMAJ8.5AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.5AHE3_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 SMAJ8.5AHE3_A/I reliable?
The price and inventory of SMAJ8.5AHE3_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 SMAJ8.5AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ8.5AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.5AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.5AHE3_A/I?
SMAJ8.5AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.5AHE3_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 SMAJ8.5AHE3_A/I?
For technical support, including SMAJ8.5AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.5AHE3_A/I requirements.
6.How does Aetrix verify that SMAJ8.5AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ8.5AHE3_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 SMAJ8.5AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ8.5AHE3_A/I?
All SMAJ8.5AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.5AHE3_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 SMAJ8.5AHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ8.5AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ8.5AHE3_A/I Tags
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