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Vishay General Semiconductor - Diodes Division SMAJ8.0CAHE3_A/H
- Part No.:
- SMAJ8.0CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.0CAHE3_A/H.pdf
- Description:
- TVS DIODE 8VWM 13.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,399
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Product details
Overview
SMAJ8.0CAHE3_A/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 (10/1000 μs waveform), commonly deployed to safeguard MOSFET gates, sensor interfaces, and automotive control modules against inductive switching transients.
For engineers reviewing the SMAJ8.0CAHE3_A/H datasheet, SMAJ8.0CAHE3_A/H pinout, SMAJ8.0CAHE3_A/H application, or SMAJ8.0CAHE3_A/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, low thermal resistance (RθJL = 30 °C/W), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (<1 μA leakage at 8.0 V), but triggers into low-impedance conduction when transient voltage exceeds its breakdown range (8.89–9.83 V at 10 mA test current). Its bidirectional architecture ensures symmetrical clamping in both polarities without polarity marking.
Thermally, it sustains 150 °C max junction temperature with 3.3 W steady-state power dissipation on infinite heatsink, and leverages glass-passivated junctions for stable surge response. The SMA package supports MSL Level 1 handling and 260 °C lead-free reflow per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line operating margin. |
| VBR min/max | 8.89 V / 9.83 V at 10 mA - Confirmed bidirectional breakdown threshold; ensures consistent turn-on across polarity and unit variation. |
| VC @ IPPM | 13.6 V at 29.4 A - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum transient overvoltage exposure. |
| PPPM | 400 W (≤78 V) - Peak surge energy absorption capability; validates suitability for IEC 61000-4-5 Level 3/4 surges. |
| ID @ VWM | 50 μA - Reverse leakage at rated stand-off; low enough to avoid loading 3.3 V/5 V logic or analog sensor outputs. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive or industrial ambient environments. |
| RθJL | 30 °C/W - Junction-to-lead thermal resistance; supports reliable pulsed power dissipation without external heatsinking. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified (HE3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (unmarked) | Bidirectional terminal pair | Identical electrical behavior in both directions; no cathode band - simplifies PCB layout and eliminates polarity assembly errors. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS, and body electronics. |
| 400 W peak pulse power (10/1000 μs) | Withstands repetitive 400 W surges at ≤0.01% duty cycle - sufficient for ISO 7637-2 Pulse 1/2/5a/b and IEC 61000-4-5 combination wave testing. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage stress on downstream ICs - critical for protecting 5 V tolerant microcontrollers and CAN transceivers. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free assembly without moisture sensitivity concerns - reduces manufacturing yield risk and bake requirements. |
| Glass-passivated junction | Ensures stable VBR and low leakage over lifetime and temperature - avoids parameter drift in harsh industrial or automotive environments. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN bus or 12 V supply rails in body control modules from load dump and inductive kickback. IC Role / Device Role / Timing Role: Shunt TVS diode clamping transients to ground before they reach MCU I/O or regulator inputs. Use Value: Maintains system uptime by preventing latch-up or gate oxide damage in automotive-grade microcontrollers during cold-crank or alternator regulation events. |
Use Scenario: Safeguarding 4–20 mA current loop or RS-485 transceiver inputs in factory automation sensors exposed to motor drive noise. IC Role / Device Role / Timing Role: Bidirectional voltage clamp absorbing ±1 kV EFT bursts and 0.5 kV surge events on differential data lines. Use Value: Eliminates need for external series resistors or RC filters while preserving signal integrity up to 10 Mbps on industrial communication links. |
| Consumer USB Port ESD Protection | Telecom DC Power Input Protection |
Use Scenario: Adding secondary-level ESD immunity to USB 2.0 VBUS and D+/D− lines in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) shunt device triggered by ±8 kV contact discharge per IEC 61000-4-2. Use Value: Achieves Class 4 ESD rating without degrading signal rise/fall times - preserves full-speed USB timing margins. |
Use Scenario: Protecting -48 V telecom power feeds against lightning-induced surges entering central office equipment. IC Role / Device Role / Timing Role: Primary surge limiter placed upstream of DC-DC converters and hot-swap controllers. Use Value: Limits let-through voltage to <16 V during 10/1000 μs 10 A surge - prevents overvoltage shutdown of downstream POL regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.0CA-M3 | Halogen-free, RoHS-compliant, commercial grade (non-AEC-Q101); identical VWM, VC, and PPPM specs. | Lacks automotive qualification - suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select when cost optimization is prioritized and automotive reliability testing is unnecessary. |
| SMBJ8.0CAHE3_A/H | Same VWM and clamping performance, but in larger SMB (DO-214AA) package with higher 600 W PPPM rating and lower RθJA (90 °C/W). | Better thermal performance and surge margin; requires larger PCB footprint and may not fit space-constrained layouts. | Choose when higher surge endurance (>400 W) or improved thermal derating is required in high-temperature enclosures. |
Compared with SMAJ8.0CAHE3_A/H, SMAJ8.0CA-M3 offers identical protection performance without automotive qualification, while SMBJ8.0CAHE3_A/H delivers enhanced surge capacity and thermal headroom at the expense of board area - enabling trade-offs between qualification, footprint, and ruggedness.
Availability
SMAJ8.0CAHE3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom infrastructure requiring stable component supply with AEC-Q101 compliance and lead-free manufacturing support.
Supply support for SMAJ8.0CAHE3_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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series targets high-reliability transient suppression in automotive, industrial, and communications systems - engineered for fast response, stable clamping, and robust surge endurance in compact surface-mount packages.
FAQ
What does the "CA" suffix indicate in SMAJ8.0CAHE3_A/H?
The "CA" suffix denotes a bidirectional configuration, meaning SMAJ8.0CAHE3_A/H provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMAJ8.0A), it has no cathode marking and clamps equally in either polarity - essential for AC-coupled lines, differential buses, or systems where polarity reversal is possible. This is confirmed in Vishay's documentation for all CA-suffixed SMAJ devices.
Is SMAJ8.0CAHE3_A/H qualified to AEC-Q101?
Yes, SMAJ8.0CAHE3_A/H is explicitly AEC-Q101 qualified, as indicated by the "HE3" suffix and verified in Vishay's ordering information table and mechanical data section. This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD - making SMAJ8.0CAHE3_A/H suitable for automotive applications such as body electronics, infotainment power rails, and sensor front-ends where automotive-grade reliability is mandatory.
What is the maximum clamping voltage of SMAJ8.0CAHE3_A/H and how is it measured?
The maximum clamping voltage (VC) of SMAJ8.0CAHE3_A/H is 13.6 V, measured at a peak pulse current (IPPM) of 29.4 A using a standardized 10/1000 μs double-exponential waveform. This value is specified in the Electrical Characteristics table of Vishay's datasheet (Document Number 88390) and represents the worst-case voltage seen by downstream circuitry during a surge event - a critical parameter for ensuring protected ICs remain within absolute maximum ratings.
How does the SMA package of SMAJ8.0CAHE3_A/H affect thermal performance?
The SMA (DO-214AC) package of SMAJ8.0CAHE3_A/H delivers a typical junction-to-lead thermal resistance (RθJL) of 30 °C/W, enabling effective heat transfer to PCB copper pads. When mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, SMAJ8.0CAHE3_A/H sustains its full 400 W peak pulse rating. Its RθJA of 120 °C/W also supports operation in ambient temperatures up to +85 °C without forced cooling - validated in Vishay's thermal characteristics table.
Can SMAJ8.0CAHE3_A/H be used in place of a unidirectional TVS like SMAJ8.0A?
No - SMAJ8.0CAHE3_A/H is bidirectional and lacks polarity marking, whereas SMAJ8.0A is unidirectional with a cathode band. Substituting SMAJ8.0CAHE3_A/H for SMAJ8.0A in DC-coupled circuits may cause unintended conduction or fail to suppress certain transient polarities correctly. The two share VWM and clamping specs but differ fundamentally in conduction directionality; replacement requires verifying circuit topology, grounding scheme, and transient polarity profile before implementation.
SMAJ8.0CAHE3_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:
- -
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ8.0CAHE3_A/H FAQ
1.How can I place an order for SMAJ8.0CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.0CAHE3_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 SMAJ8.0CAHE3_A/H reliable?
The price and inventory of SMAJ8.0CAHE3_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 SMAJ8.0CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ8.0CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.0CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.0CAHE3_A/H?
SMAJ8.0CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.0CAHE3_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 SMAJ8.0CAHE3_A/H?
For technical support, including SMAJ8.0CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.0CAHE3_A/H requirements.
6.How does Aetrix verify that SMAJ8.0CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ8.0CAHE3_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 SMAJ8.0CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ8.0CAHE3_A/H?
All SMAJ8.0CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.0CAHE3_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 SMAJ8.0CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ8.0CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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