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Vishay General Semiconductor - Diodes Division SMAJ8.0HE3/5A
- Part No.:
- SMAJ8.0HE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.0HE3/5A.pdf
- Description:
- TVS DIODE 8VWM 15VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,282
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Product details
Overview
SMAJ8.0HE3/5A from Vishay General Semiconductor is a high-reliability, AEC-Q101-qualified unidirectional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive and industrial overvoltage protection. It features 8.0 V stand-off voltage (VWM), 15.0 V maximum clamping voltage (VC) at 26.7 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 µs waveform), protecting sensitive MOSFETs, ICs, and sensor signal lines against ESD and inductive switching transients.
For engineers reviewing the SMAJ8.0HE3/5A datasheet, SMAJ8.0HE3/5A pinout, SMAJ8.0HE3/5A application, or SMAJ8.0HE3/5A equivalent, this page delivers verified electrical parameters, automotive-grade qualification status, thermal resistance values, junction capacitance behavior, and direct alternative part guidance - all specific to the HE3/5A variant with high-reliability tin plating and JESD201 Class 2 whisker resistance.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector, activating when reverse voltage exceeds its 8.0 V stand-off threshold and clamping transients to ≤15.0 V at 26.7 A. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 µA at VWM), while the DO-214AC package supports automated placement and meets MSL Level 1 reflow requirements (260 °C peak).
Thermal performance is defined by RθJA = 120 °C/W and RθJL = 30 °C/W, enabling reliable operation up to +150 °C junction temperature. The device sustains 40 A non-repetitive forward surge current (8.3 ms half-sine) and exhibits typical junction capacitance of ~500 pF at VWM, making it suitable for low-to-moderate speed signal line protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe operating margin for 5–6 V rail protection. |
| VC @ IPPM | 15.0 V - Clamped voltage during 26.7 A 10/1000 µs surge; ensures downstream ICs rated ≤15 V remain within absolute maximum ratings. |
| IPPM | 26.7 A - Peak surge current capability under standard 10/1000 µs waveform; determines minimum trace width and PCB copper pad sizing (0.2 × 0.2″ required). |
| PPPM | 400 W - Peak pulse power dissipation; confirms suitability for automotive load-dump and ISO 7637-2 Pulse 1/2a/5a compliance testing. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive modules and industrial motor drives without derating below 125 °C ambient. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance; informs heatsinking needs when operating near power limits in enclosed enclosures. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, molded plastic case meeting UL 94 V-0 flammability rating. Matte tin-plated leads, solderable per J-STD-002 and JESD22-B102. Cathode band denotes terminal polarity for unidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-side reference | Connected to ground or lower-potential node; establishes reference for clamping action during positive transients on cathode side. |
| Cathode (banded end) | Reverse-biased input / protected line connection | Connected to signal/power line requiring protection; conducts only during overvoltage events exceeding VWM. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and ADAS sensors - no additional qualification testing required. |
| 400 W peak pulse power (10/1000 µs) | Withstands severe transients such as ISO 7637-2 Pulse 5a (load dump) without degradation, supporting 12 V system robustness. |
| JESD201 Class 2 whisker resistance | Ensures long-term reliability in high-temperature, high-humidity environments common in automotive under-hood deployments. |
| Glass-passivated junction | Delivers stable VBR (8.89–10.9 V) and low leakage (<1.0 µA), critical for battery-powered sensor nodes where standby current must be minimized. |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from load dump and alternator ripple in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Shunt clamping element placed between protected line and ground, responding within <1 ns to limit voltage excursion. Use Value: Maintains VC ≤15.0 V during 400 W surges, ensuring compatibility with 16 V-tolerant automotive MCUs and preventing latch-up or gate oxide damage. |
Use Scenario: Safeguarding analog output lines of pressure/temperature sensors in PLC analog input modules exposed to field wiring transients. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 µA) voltage clamp on 0–10 V or 4–20 mA signal paths, preserving measurement accuracy during ESD events. Use Value: Enables >10 kV contact ESD immunity per IEC 61000-4-2 without adding series resistance that would degrade signal bandwidth or introduce offset. |
| Consumer Power Adapter Input Stage | MOSFET Gate Driver Protection |
|
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters for smart home devices, guarding against transformer flyback spikes and capacitor discharge surges. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) transient suppressor placed across DC output rails prior to LDO regulators. Use Value: Limits VC to 15.0 V at 26.7 A, preventing regulator overvoltage failure and maintaining 5 V/3.3 V rail integrity during 10/1000 µs surges. |
Use Scenario: Clamping gate-source voltage of N-channel power MOSFETs in motor driver H-bridges subjected to shoot-through or inductive kickback. IC Role / Device Role / Timing Role: Unidirectional clamp from gate to source, triggered only when VGS exceeds 8.0 V, avoiding false triggering during normal PWM switching. Use Value: Prevents gate oxide breakdown (typically rated ≤20 V) while allowing full 10–12 V gate drive for optimal RDS(on), with no impact on switching speed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.0AHE3/5A | Lower breakdown range (8.89–9.83 V vs. 8.89–10.9 V); tighter VBR tolerance; same VWM and VC. | Better suited for precision 8 V rail protection where tighter clamping consistency is required. | Select SMAJ8.0AHE3/5A if design requires reduced VBR variation across temperature and lot; otherwise SMAJ8.0HE3/5A offers broader surge margin. |
| SMBJ8.0HE3/5A | Same electrical specs but in DO-214AA (SMB) package - 2.5 mm wider body, higher PPPM (600 W), RθJA = 80 °C/W. | Preferred for higher-power or thermally constrained layouts where larger footprint improves heat dissipation. | Choose SMBJ8.0HE3/5A when board space allows and thermal management is critical; SMAJ8.0HE3/5A remains optimal for dense automotive PCBs with strict height constraints. |
Compared with SMAJ8.0AHE3/5A, the SMAJ8.0HE3/5A provides greater surge margin due to wider VBR range, while compared with SMBJ8.0HE3/5A, it trades 200 W pulse power and thermal performance for 30 % smaller footprint - making it ideal for space-constrained automotive modules where 400 W clamping suffices.
Availability
SMAJ8.0HE3/5A is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and consumer power adapter designs requiring stable component supply with AEC-Q101 qualification and traceable sourcing.
Supply support for SMAJ8.0HE3/5A 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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and automotive-grade validation.
The SMAJ series was developed specifically for high-reliability transient suppression in automotive and industrial environments, combining AEC-Q101 qualification, robust surge handling, and surface-mount compatibility for automated manufacturing.
FAQ
What is the key qualification difference between SMAJ8.0HE3/5A and standard SMAJ8.0E3/5A?
The SMAJ8.0HE3/5A carries the "H" suffix indicating high-reliability grade and AEC-Q101 qualification, whereas SMAJ8.0E3/5A is commercial grade only. SMAJ8.0HE3/5A undergoes extended stress testing including temperature cycling, humidity bias, and accelerated life testing per AEC-Q101 Rev D. This makes SMAJ8.0HE3/5A mandatory for automotive under-hood and safety-critical applications where field failure is unacceptable.
Does SMAJ8.0HE3/5A support bi-directional transient suppression?
No, SMAJ8.0HE3/5A is a unidirectional TVS diode - it clamps only in reverse bias and conducts forward current like a standard diode. For bi-directional protection, Vishay specifies CA-suffix parts (e.g., SMAJ8.0CAHE3/5A). Using SMAJ8.0HE3/5A in bi-directional configurations risks forward conduction during negative transients, potentially damaging upstream circuitry or failing to suppress the event.
What is the maximum clamping voltage of SMAJ8.0HE3/5A under actual surge conditions?
The maximum clamping voltage of SMAJ8.0HE3/5A is 15.0 V, measured at 26.7 A peak pulse current using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed across temperature (−55 °C to +150 °C) and lifetime, and represents the upper bound of voltage seen by protected circuitry during worst-case surge events.
How does the HE3 suffix affect solderability and reliability of SMAJ8.0HE3/5A?
The HE3 suffix denotes matte tin plating qualified to JESD201 Class 2 for whisker resistance, plus compliance with RoHS and AEC-Q101. Unlike standard E3 plating (Class 1A), HE3 withstands prolonged exposure to high temperature/humidity without tin whisker growth - critical for automotive modules operating at 105 °C ambient for 15+ years. Solderability remains fully compatible with J-STD-002 and lead-free reflow profiles up to 260 °C.
Can SMAJ8.0HE3/5A be used to protect USB or high-speed data lines?
No - SMAJ8.0HE3/5A has typical junction capacitance of ~500 pF at VWM, which would severely attenuate signals above ~1 MHz and disrupt USB 2.0 (480 Mbps) or CAN FD timing. It is intended for power rails and low-speed analog/sensor lines (e.g., LIN, analog outputs, power inputs). For high-speed data lines, use low-capacitance TVS arrays such as Vishay's USBxx series or discrete ultra-low-CJ diodes.
SMAJ8.0HE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 8V
- Voltage - Breakdown (Min):
- 8.89V
- Voltage - Clamping (Max) @ Ipp:
- 15V
- Current - Peak Pulse (10/1000µs):
- 26.7A
- 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)
SMAJ8.0HE3/5A FAQ
1.How can I place an order for SMAJ8.0HE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.0HE3/5A 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 SMAJ8.0HE3/5A reliable?
The price and inventory of SMAJ8.0HE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.0HE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ8.0HE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.0HE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.0HE3/5A?
SMAJ8.0HE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.0HE3/5A 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 SMAJ8.0HE3/5A?
For technical support, including SMAJ8.0HE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.0HE3/5A requirements.
6.How does Aetrix verify that SMAJ8.0HE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ8.0HE3/5A 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 SMAJ8.0HE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ8.0HE3/5A?
All SMAJ8.0HE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.0HE3/5A, 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 SMAJ8.0HE3/5A part is unused and in its original packaging.
Return procedure for SMAJ8.0HE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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