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Vishay General Semiconductor - Diodes Division SMA5J18HE3/5A
- Part No.:
- SMA5J18HE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J18HE3/5A.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,921
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Product details
Overview
SMA5J18HE3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor diode in DO-214AC (SMA) package, designed for high-energy surge protection on power and signal lines. It features a 18 V standoff voltage (VWM), 20.0–22.1 V breakdown voltage (VBR), 500 W peak pulse power (10/1000 µs), 17.1 A clamping current at 29.2 V, and AEC-Q101 qualification for automotive electronics.
For engineers reviewing the SMA5J18HE3/5A datasheet, SMA5J18HE3/5A pinout, SMA5J18HE3/5A application, or SMA5J18HE3/5A equivalent, this page delivers verified electrical parameters, thermal resistance (RθJA = 80 °C/W), JEDEC-compliant packaging, RoHS and whisker-test compliance (JESD 201 Class 2), and real-world use cases in automotive ECUs and industrial sensor interfaces.
Technical Context
This unidirectional TVS diode operates by avalanche breakdown to clamp transient overvoltages above its VWM of 18 V, with a maximum clamping voltage of 29.2 V at 17.1 A IPPM. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time under ESD and lightning-induced surges.
Designed for surface-mount assembly on 5.0 mm × 5.0 mm copper pads, it supports automated placement and meets MSL Level 1 (260 °C reflow). Thermal performance is characterized by RθJA = 80 °C/W and RθJL = 25 °C/W, enabling reliable operation up to TJ = 150 °C in constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 20.0 V / 22.1 V at 1 mA - Confirmed breakdown threshold range for design margining |
| VC @ IPPM | 29.2 V at 17.1 A - Clamping voltage during 500 W 10/1000 µs surge, limiting downstream stress |
| PPPM | 500 W - Peak pulse power handling per single transient event, per standard waveform |
| IR @ VWM | <1.0 µA - Low leakage preserves signal integrity and battery life in always-on circuits |
| TJ max | 150 °C - Maximum junction temperature enabling use in under-hood automotive environments |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band; compliant with UL 94 V-0, J-STD-002 solderability, and JESD 22-B102 mechanical robustness.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode (banded end) | Avalanche clamping terminal | Connected to protected line (e.g., 12 V rail or CAN-H); conducts when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Glass-passivated junction | Stable VBR tolerance and low leakage across temperature and lifetime |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving clamping precision |
| MSL Level 1 rating | Enables single-reflow assembly without moisture sensitivity concerns |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V supply inputs in engine control units (ECUs) against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery rail and DC-DC input stage. Use Value: Limits transient voltage to ≤29.2 V during 500 W surges, preventing damage to downstream regulators and microcontrollers. | Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) in factory automation sensors exposed to EFT and surge noise. IC Role / Device Role / Timing Role: Standoff protector on signal path, activated only during overvoltage events >18 V. Use Value: Maintains <1.0 µA leakage at 18 V, ensuring minimal impact on loop accuracy and long-term calibration stability. |
| Consumer Power Adapter Input Stage | Telecom DC Feeding Interface |
Use Scenario: Secondary-side surge suppression in AC/DC adapters for smart home hubs subjected to mains-borne transients. IC Role / Device Role / Timing Role: Fast-response clamping element after rectification but before bulk capacitor filtering. Use Value: Withstands 40 A IFSM (8.3 ms half-sine), surviving repeated inrush and surge events without degradation. | Use Scenario: DC power feed protection in PoE-powered base stations where 48 V bias lines face induced lightning surges. IC Role / Device Role / Timing Role: Bidirectional-capable variant not applicable; this unidirectional part used with polarity-aware feed architecture. Use Value: 80 °C/W thermal resistance enables effective heat dissipation on compact telecom PCBs with limited copper area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J18A-E3/5A | No AEC-Q101 qualification; same VWM, VBR, PPPM, and package | Commercial-grade only; unsuitable for automotive production | Select when automotive qualification is not required and cost optimization is prioritized |
| SMC5J18AHE3/5A | DO-214AB (SMC) package - larger footprint, higher IPPM (27.6 A), same VC (29.2 V) | Higher surge margin needed; requires PCB layout change due to 7.11 mm × 6.22 mm vs. 4.93 mm × 3.99 mm | Choose for systems requiring >500 W surge handling or legacy SMC footprint compatibility |
Compared with SMA5J18A-E3/5A, the SMA5J18HE3/5A adds automotive-grade reliability without altering electrical specs; versus SMC5J18AHE3/5A, it trades surge capacity for space-constrained mounting while retaining identical clamping behavior and AEC-Q101 compliance.
Availability
SMA5J18HE3/5A is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and consumer power adapter designs requiring stable component supply, AEC-Q101 validation, and RoHS-compliant manufacturing.
Supply support for SMA5J18HE3/5A 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMA5J series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-power-density transient suppression in harsh environments such as automotive power systems and industrial control cabinets.
FAQ
What is the clamping voltage of the SMA5J18HE3/5A under a 10/1000 µs surge?
The SMA5J18HE3/5A clamps to a maximum of 29.2 V when subjected to its rated peak pulse current of 17.1 A (10/1000 µs waveform). This value is measured at the specified test condition and defines the upper voltage limit imposed on protected circuitry during transient events.
Is the SMA5J18HE3/5A suitable for automotive applications?
Yes, the SMA5J18HE3/5A is AEC-Q101 qualified and explicitly rated for automotive use. Its construction includes glass-passivated junctions, MSL Level 1 reflow compatibility, and operation up to 150 °C junction temperature-meeting critical requirements for engine bay and chassis-mounted electronics.
What does the "HE3" suffix indicate in SMA5J18HE3/5A?
The "HE3" suffix denotes RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance. It distinguishes the part from commercial-grade "E3" variants and confirms compliance with automotive reliability and plating standards.
How does the SMA5J18HE3/5A differ from the SMA5J18A-E3/5A?
The SMA5J18HE3/5A includes full AEC-Q101 qualification and JESD 201 Class 2 whisker testing, whereas the SMA5J18A-E3/5A is commercial-grade only. All electrical parameters-including VWM, VBR, VC, and PPPM-are identical between the two variants.
What is the thermal resistance of the SMA5J18HE3/5A, and how does it affect PCB layout?
The SMA5J18HE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W when mounted on 5.0 mm × 5.0 mm copper pads per terminal. To maintain safe junction temperatures, designers must allocate sufficient copper area and avoid excessive trace length or isolation around the SMA5J18HE3/5A footprint.
SMA5J18HE3/5A 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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 15.5A
- Power - Peak Pulse:
- 500W
- 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)
SMA5J18HE3/5A FAQ
1.How can I place an order for SMA5J18HE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J18HE3/5A 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 SMA5J18HE3/5A reliable?
The price and inventory of SMA5J18HE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J18HE3/5A is usually 5 days.
3.What payment methods are accepted for SMA5J18HE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J18HE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J18HE3/5A?
SMA5J18HE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J18HE3/5A 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 SMA5J18HE3/5A?
For technical support, including SMA5J18HE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J18HE3/5A requirements.
6.How does Aetrix verify that SMA5J18HE3/5A is sourced from the original manufacturer or authorized distributors?
All SMA5J18HE3/5A 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 SMA5J18HE3/5A meets industry standards.
7.What is the process for return or replacement of SMA5J18HE3/5A?
All SMA5J18HE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J18HE3/5A, 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 SMA5J18HE3/5A part is unused and in its original packaging.
Return procedure for SMA5J18HE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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