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Vishay General Semiconductor - Diodes Division SMAJ17AHE3_A/H
- Part No.:
- SMAJ17AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ17AHE3_A/H.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,711
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Product details
Overview
SMAJ17AHE3_A/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 17 V standoff voltage (VWM), 18.9–20.9 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤27.6 V at 14.5 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 SMAJ17AHE3_A/H datasheet, SMAJ17AHE3_A/H pinout, SMAJ17AHE3_A/H application, or SMAJ17AHE3_A/H equivalent, key selection criteria include its AEC-Q101 qualification, 400 W peak pulse power rating (≤78 V), low 0.090 %/°C VBR temperature coefficient, and SMA (DO-214AC) surface-mount package optimized for automated assembly in high-reliability industrial and automotive systems.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, conducting only when reverse voltage exceeds VBR. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response (<1 ns), enabling suppression of ESD, inductive switching spikes, and lightning-induced surges before downstream components are damaged.
Thermally, it delivers 3.3 W steady-state power dissipation on infinite heatsink at 50 °C, with RθJA = 120 °C/W and RθJL = 30 °C/W - confirming suitability for compact PCB layouts with minimal copper area (0.2" × 0.2" pads per terminal). The HE3 suffix denotes RoHS-compliant, AEC-Q101-qualified construction with matte tin-plated leads meeting J-STD-002 solderability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 18.9 V / 20.9 V at 1 mA - precise breakdown threshold ensuring reliable clamping onset |
| VC @ IPPM | 27.6 V at 14.5 A - clamped voltage during 10/1000 μs surge, limiting stress on protected ICs |
| PPPM | 400 W - peak pulse power handling capability for short-duration transients up to 78 V |
| IFSM | 40 A - surge current rating for 8.3 ms half-sine wave, supporting inductive load switching events |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| Package | SMA (DO-214AC) - industry-standard SMD outline with 2.54 mm lead pitch and MSL Level 1 moisture sensitivity |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, cathode-banded unidirectional configuration. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H), with 0.208" body length and 0.100" lead spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path (unidirectional) | Connected to ground or lower-potential rail; conducts during positive transients relative to cathode |
| Cathode (banded end) | Reverse-biased terminal during normal operation | Connected to protected line (e.g., signal or power rail); initiates clamping when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensors |
| 400 W peak pulse power (10/1000 μs) | Withstands high-energy transients without degradation in industrial motor drives and power supplies |
| Glass passivated junction | Ensures stable VBR and low leakage across temperature and lifetime |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT assembly processes without pre-baking |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ESD >15 kV) |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between signal line and ground, responding within <1 ns to limit voltage to ≤27.6 V. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V sensor interface ICs during 12 V system transients up to 400 W. | Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to relay coil flyback and EMI coupling. IC Role / Device Role / Timing Role: Parallel-connected TVS on 24 V DC input lines, clamping induced spikes before reaching optocoupler or MCU GPIO. Use Value: Maintains functional safety integrity by holding clamped voltage below 27.6 V while absorbing 14.5 A surges without derating. |
| Consumer Power Adapter Output | Telecom Line Card Surge Protection |
Use Scenario: Secondary-side overvoltage protection in AC/DC adapters powering USB-C PD devices and smart home hubs. IC Role / Device Role / Timing Role: Unidirectional clamp on +5 V/9 V/12 V output rails, triggered only during fault conditions. Use Value: Limits output voltage excursion to safe levels during transformer saturation or feedback loop failure, preserving connected SoCs. | Use Scenario: Front-end protection for Ethernet PHYs and DSL line drivers subjected to lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: First-stage shunt device on twisted-pair interfaces, diverting energy to chassis ground before reaching integrated transceivers. Use Value: Achieves 400 W surge handling with ≤27.6 V clamping, reducing need for secondary protection stages and board space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17A-E3/61 | Same electrical specs, RoHS-compliant but not AEC-Q101 qualified; commercial-grade only | Lacks automotive qualification - unsuitable for under-hood or safety-critical ECUs | Select when cost-sensitive industrial designs do not require automotive reliability validation |
| SMBJ17AHE3_A/H | Same VWM/VBR, but SMB package (DO-214AA) with higher 600 W PPPM rating and larger thermal mass | Better thermal performance in high-duty-cycle surge environments; requires larger PCB footprint | Choose for applications needing enhanced surge margin where board space permits SMB footprint |
Compared with SMAJ17A-E3/61, SMAJ17AHE3_A/H adds AEC-Q101 qualification for automotive use; compared with SMBJ17AHE3_A/H, it trades 200 W lower peak power for 30 % smaller PCB area - making it optimal for space-constrained automotive modules requiring validated reliability.
Availability
SMAJ17AHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, consumer power adapter outputs, and telecom line card surge protection requiring stable component supply across extended production lifecycles.
Supply support for SMAJ17AHE3_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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-speed transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping performance and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMAJ17AHE3_A/H at its rated peak pulse current?
The SMAJ17AHE3_A/H has a maximum clamping voltage (VC) of 27.6 V at its rated peak pulse current (IPPM) of 14.5 A under the standardized 10/1000 μs waveform. This value is measured per JEDEC test conditions and guarantees that protected downstream components experience no more than 27.6 V during surge events - critical for safeguarding 3.3 V and 5 V logic interfaces. The SMAJ17AHE3_A/H maintains this clamping performance across its full operating temperature range.
Is SMAJ17AHE3_A/H suitable for automotive applications?
Yes, SMAJ17AHE3_A/H is explicitly AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation. It meets stringent automotive reliability requirements including temperature cycling, humidity testing, and mechanical shock - making it appropriate for engine control units, body electronics, and ADAS sensor modules. The SMAJ17AHE3_A/H is rated for operation from −55 °C to +150 °C and supports automotive load-dump and ISO 7637-2 pulse immunity.
What does the "HE3" suffix indicate in SMAJ17AHE3_A/H?
The "HE3" suffix in SMAJ17AHE3_A/H denotes RoHS-compliant construction with AEC-Q101 qualification, distinguishing it from commercial-grade variants like SMAJ17A-E3. It specifies matte tin-plated leads compliant with J-STD-002, JESD 22-B102 solderability, and JESD 201 Class 2 whisker resistance. The "_A/H" further indicates packaging in 7" tape-and-reel format (1800 units per reel), verified in Vishay's official ordering information table.
How does SMAJ17AHE3_A/H compare to bidirectional TVS diodes like SMAJ17CA?
SMAJ17AHE3_A/H is unidirectional and intended for DC circuits where polarity is fixed (e.g., +12 V supply lines), whereas SMAJ17CA is bidirectional and suited for AC or differential signal lines (e.g., RS-485). The SMAJ17AHE3_A/H offers identical VWM (17 V) and VBR (18.9–20.9 V) in one direction only, with cathode band marking; SMAJ17CA provides symmetric clamping in both directions. Selection depends strictly on circuit topology - using SMAJ17AHE3_A/H in AC applications would cause forward conduction and failure.
What is the thermal resistance of SMAJ17AHE3_A/H, and how does it affect PCB layout?
SMAJ17AHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W. These values assume mounting on 0.2" × 0.2" copper pads per terminal. To maintain safe junction temperatures under sustained power dissipation, designers must allocate adequate copper area and avoid excessive trace length - especially critical in automotive modules where ambient temperatures exceed 85 °C. The SMAJ17AHE3_A/H's low RθJL enables effective heat transfer through solder joints into internal ground planes.
SMAJ17AHE3_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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 14.5A
- 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)
SMAJ17AHE3_A/H FAQ
1.How can I place an order for SMAJ17AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ17AHE3_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 SMAJ17AHE3_A/H reliable?
The price and inventory of SMAJ17AHE3_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 SMAJ17AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ17AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ17AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ17AHE3_A/H?
SMAJ17AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ17AHE3_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 SMAJ17AHE3_A/H?
For technical support, including SMAJ17AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ17AHE3_A/H requirements.
6.How does Aetrix verify that SMAJ17AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ17AHE3_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 SMAJ17AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ17AHE3_A/H?
All SMAJ17AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ17AHE3_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 SMAJ17AHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ17AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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