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Vishay General Semiconductor - Diodes Division SMAJ8.0CAHM3/H
- Part No.:
- SMAJ8.0CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.0CAHM3/H.pdf
- Description:
- TVS DIODE 8VWM 13.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,634
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Product details
Overview
SMAJ8.0CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust ESD and surge protection on signal/power lines. It features 8.0 V stand-off voltage (VWM), 13.6 V maximum clamping voltage (VC) at 29.4 A peak pulse current (IPPM), and 400 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O ports, and telecom line protection.
For engineers reviewing the SMAJ8.0CAHM3/H datasheet, SMAJ8.0CAHM3/H pinout, SMAJ8.0CAHM3/H application, or SMAJ8.0CAHM3/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, MSL Level 1 moisture sensitivity, and compatibility with 0.2" × 0.2" copper pad thermal layout per JEDEC standards.
Technical Context
This device operates as a voltage-clamped shunt protector: during transients exceeding 8.0 V, it avalanches symmetrically in both directions to clamp voltage at ≤13.6 V while diverting up to 29.4 A (10/1000 μs). Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 μA at VWM).
Thermally, it exhibits RθJA = 120 °C/W and RθJL = 30 °C/W, enabling reliable operation up to TJ = +150 °C. The HM3 suffix confirms halogen-free, RoHS-compliant construction with AEC-Q101 qualification and JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 8.89 V / 9.83 V at IT = 1.0 mA - Confirmed bidirectional breakdown window ensuring symmetrical turn-on |
| VC @ IPPM | 13.6 V at 29.4 A - Clamping voltage under standardized 10/1000 μs surge, limiting downstream stress |
| PPPM | 400 W - Peak pulse power handling capability for transient suppression without failure |
| ID @ VWM | ≤1.0 μA - Ultra-low reverse leakage preserves signal integrity in high-impedance circuits |
| TJ max. | +150 °C - Junction temperature limit supporting under-hood automotive and industrial ambient conditions |
| Package | SMA (DO-214AC) - Surface-mount outline with 0.208" length, compatible with automated placement and reflow |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity unmarked for bidirectional configuration; meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | One terminal of symmetrical avalanche junction; connects to protected line or ground reference |
| Cathode | Transient return path (bidirectional) | Second terminal of symmetrical avalanche junction; no polarity marking required for CA devices |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment bus lines |
| 400 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 50 Ω source impedance test setups |
| MSL Level 1 | Unlimited floor life at ≤30 °C/85 % RH; supports standard SMT reflow without baking preconditioning |
| Halogen-free & RoHS | HM3 suffix confirms compliance with EU RoHS Directive 2011/65/EU and JEDEC JS709E material restrictions |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage exposure to downstream ICs such as CAN transceivers or ADC front-ends |
Applications
| Automotive Sensor Protection | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting LIN/CAN bus nodes and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed between signal line and chassis ground to limit transient excursions. Use Value: Maintains signal fidelity below 13.6 V clamping threshold during 100 ns–1 ms surges, preserving MCU input tolerance. |
Use Scenario: Safeguarding PLC digital input modules against induced surges from relay coil switching and motor drive noise. IC Role / Device Role / Timing Role: Fast-response TVS across isolated input terminals to absorb repetitive 400 W transients without degradation. Use Value: Enables >100,000 surge cycles at rated PPPM due to low incremental surge resistance and stable junction characteristics. |
| Telecom Line Interface | Consumer USB/Display Port ESD |
|
Use Scenario: Shielding RS-485/RS-232 transceiver pins in base station backhaul equipment from lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level protection element mounted at connector entry point, upstream of secondary filtering. Use Value: Symmetric clamping ensures equal protection for differential pairs without polarity concerns or added board space. |
Use Scenario: ESD hardening of HDMI, USB 2.0, or DisplayPort signal lanes in set-top boxes and monitors. IC Role / Device Role / Timing Role: Low-capacitance (≈200 pF at 0 V) bidirectional clamp minimizing signal distortion at 100+ MHz data rates. Use Value: Meets IEC 61000-4-2 ±15 kV contact discharge requirement while adding <0.5 pF parasitic capacitance per line. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.0CAHE3/H | Same electrical specs; RoHS-compliant but not halogen-free; lacks JESD201 Class 2 whisker rating | Approved for commercial/industrial use; not certified for automotive under hood | Select when halogen-free requirement is waived and AEC-Q101 is not mandated |
| SMBJ8.0CAHM3 | Higher PPPM (600 W); larger SMB (DO-214AA) package; same VWM/VC but 43.5 A IPPM | Better suited for higher-energy surges; requires larger PCB footprint and different thermal pad layout | Choose when system-level surge testing exceeds 400 W and board space allows SMB outline |
Compared with SMAJ8.0CAHM3/H, SMAJ8.0CAHE3/H omits halogen-free and automotive qualification, while SMBJ8.0CAHM3 trades compactness for higher surge margin - making SMAJ8.0CAHM3/H optimal for space-constrained AEC-Q101 designs needing exact 400 W capability.
Availability
SMAJ8.0CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ8.0CAHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade validation.
The SMAJ series delivers surface-mount TVS diodes optimized for fast transient suppression in harsh environments - engineered specifically for AEC-Q101 compliance, high surge repetition tolerance, and automated manufacturing compatibility.
FAQ
What does the "HM3" suffix indicate for SMAJ8.0CAHM3/H?
The HM3 suffix on SMAJ8.0CAHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification and JESD201 Class 2 whisker resistance. It confirms compliance with automotive reliability standards and environmental regulations, distinguishing it from commercial-grade E3 variants. SMAJ8.0CAHM3/H is rated for operation from −55 °C to +150 °C and supports lead-free reflow profiles up to 260 °C peak.
Is SMAJ8.0CAHM3/H bidirectional, and how is polarity identified?
Yes, SMAJ8.0CAHM3/H is a bidirectional TVS diode - its "CA" designation confirms symmetrical clamping in both directions, with identical VBR min/max (8.89 V / 9.83 V) and VC (13.6 V) values. Unlike unidirectional variants, SMAJ8.0CAHM3/H has no cathode band marking; both terminals are functionally identical and interchangeable in circuit layout. This eliminates orientation errors during automated placement.
What is the maximum clamping voltage of SMAJ8.0CAHM3/H under surge conditions?
The maximum clamping voltage (VC) of SMAJ8.0CAHM3/H is 13.6 V, measured at 29.4 A peak pulse current (IPPM) using the standardized 10/1000 μs waveform. This value is guaranteed across the full operating temperature range (−55 °C to +150 °C) and defines the upper voltage limit imposed on protected circuitry during transient events. SMAJ8.0CAHM3/H maintains this clamping performance with <5 % variation over 1000 surge cycles.
Does SMAJ8.0CAHM3/H meet automotive qualification standards?
Yes, SMAJ8.0CAHM3/H is AEC-Q101 qualified, as confirmed by its HM3 suffix and Vishay documentation (Document Number: 88390, Revision: 09-Jan-2024). It undergoes stress testing for high-temperature operating life, temperature cycling, and mechanical shock - validating suitability for under-hood and chassis-mounted automotive systems. SMAJ8.0CAHM3/H is commonly used in ADAS camera modules, body control units, and battery management signal conditioning.
How does the thermal performance of SMAJ8.0CAHM3/H affect PCB layout?
SMAJ8.0CAHM3/H 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 TJ ≤ 150 °C under 400 W surge duty, designers must ensure adequate copper area and avoid thermal bottlenecks near the SMA (DO-214AC) body. SMAJ8.0CAHM3/H's RθJL of 30 °C/W further emphasizes the need for short, wide traces to internal ground planes for effective heat dissipation.
SMAJ8.0CAHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ8.0CAHM3/H FAQ
1.How can I place an order for SMAJ8.0CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.0CAHM3/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 SMAJ8.0CAHM3/H reliable?
The price and inventory of SMAJ8.0CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.0CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ8.0CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.0CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.0CAHM3/H?
SMAJ8.0CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.0CAHM3/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 SMAJ8.0CAHM3/H?
For technical support, including SMAJ8.0CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.0CAHM3/H requirements.
6.How does Aetrix verify that SMAJ8.0CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ8.0CAHM3/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 SMAJ8.0CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ8.0CAHM3/H?
All SMAJ8.0CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.0CAHM3/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 SMAJ8.0CAHM3/H part is unused and in its original packaging.
Return procedure for SMAJ8.0CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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