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Vishay General Semiconductor - Diodes Division SMA5J18AHM3_A/H
- Part No.:
- SMA5J18AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J18AHM3_A/H.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,098
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Product details
Overview
SMA5J18AHM3_A/H from Vishay General Semiconductor is a unidirectional 500 W Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, with 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR), and 29.2 V clamping voltage (VC) at 17.1 A peak pulse current (IPPM). It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients in automotive and industrial power electronics.
For engineers reviewing the SMA5J18AHM3_A/H datasheet, SMA5J18AHM3_A/H pinout, SMA5J18AHM3_A/H application, or SMA5J18AHM3_A/H equivalent, key selection criteria include clamping performance under 10/1000 µs surge, AEC-Q101 qualification status, halogen-free RoHS compliance, and thermal resistance (RθJA = 80 °C/W) for PCB layout validation.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its specified VBR range (20.0–22.1 V at 1 mA test current). Its low incremental surge resistance ensures stable clamping during fast transients, while glass-passivated junction enhances reliability under repetitive surge stress.
The device is rated for 500 W peak pulse power (10/1000 µs waveform), supports 40 A non-repetitive forward surge current (8.3 ms half-sine), and operates across -55 °C to +150 °C junction temperature range - validated per JESD22-B102 and J-STD-020 MSL level 1 (260 °C peak reflow).
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 - defines reliable avalanche initiation threshold window |
| VC @ IPPM | 29.2 V at 17.1 A - clamped voltage during full-rated 500 W transient, limiting downstream stress |
| PPPM | 500 W - peak surge power handling capability using standard 10/1000 µs waveform |
| RθJA | 80 °C/W - thermal resistance from junction to ambient on 5.0 mm × 5.0 mm copper pads |
| TJ max | +150 °C - maximum allowable junction temperature for sustained operation |
| ID @ VWM | 1.0 µA - ultra-low leakage at stand-off voltage, minimizing standby power loss |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Polarity indicated by cathode band; unidirectional configuration only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to circuit ground or lower-potential node in unidirectional clamp configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12 V rail or sensor input); band-marked end |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC J-STD-020 MSL level 1 (260 °C) |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage exposure during surge events compared to competing TVS devices |
| Glass-passivated junction | Enhances long-term stability and moisture resistance in harsh industrial environments |
| Fast response time (< 1 ps) | Clamps transients before sensitive downstream components experience damaging overvoltage |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load-dump and jump-start transients on 12 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between power rail and ground, absorbing up to 500 W surges without failure. Use Value: Prevents latch-up or permanent damage to microcontrollers and CAN transceivers during ISO 7637-2 Pulse 5a/b events. | Use Scenario: Shielding analog inputs of pressure/temperature sensors in PLC I/O modules from field-wiring induced surges. IC Role / Device Role / Timing Role: Standoff protection element on signal line, leveraging 1.0 µA leakage to avoid DC offset errors. Use Value: Maintains signal integrity under IEC 61000-4-5 Level 3 (2 kV) surges while preserving low-noise measurement accuracy. |
| DC-DC Converter Input Stage | MOSFET Gate Driver Protection |
Use Scenario: Safeguarding buck converter input stages against back-EMF from relay coils and motor drivers in factory automation systems. IC Role / Device Role / Timing Role: Primary transient shunt on 24 V input rail, activated within picoseconds of overvoltage onset. Use Value: Enables use of cost-optimized input capacitors by limiting peak voltage excursion to ≤29.2 V during 17.1 A surges. | Use Scenario: Protecting high-side N-channel MOSFET gate drivers from Miller-induced voltage spikes during fast switching. IC Role / Device Role / Timing Role: Clamping diode tied between gate and source, exploiting low RθJL (25 °C/W) for localized thermal management. Use Value: Prevents unintended turn-on and gate oxide breakdown while supporting >1 MHz PWM frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J18AHE3_A/H | Same electrical specs; RoHS-compliant but not halogen-free; no AEC-Q101 qualification | Restricted to commercial-grade industrial or consumer applications without automotive qualification requirements | Select when halogen-free content or automotive qualification is not required and cost optimization is prioritized |
| SMC5J18A | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package; higher RθJA (50 °C/W) and 600 W PPPM rating | Better thermal performance under sustained surge duty cycles; requires larger PCB footprint | Choose when higher surge repetition rate or improved thermal dissipation is needed and board space permits |
Compared with SMA5J18AHM3_A/H, SMA5J18AHE3_A/H lacks halogen-free and AEC-Q101 compliance, while SMC5J18A offers higher power rating and thermal margin at the cost of footprint size - making SMA5J18AHM3_A/H optimal for space-constrained, automotive-qualified 12 V/24 V systems requiring halogen-free materials.
Availability
SMA5J18AHM3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, DC-DC converter inputs, and MOSFET gate driver circuits requiring stable component supply with full traceability and lifecycle support.
Supply support for SMA5J18AHM3_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, TVS devices, and optoelectronics with emphasis on reliability and application-specific performance.
The SMA5J series is designed for high-power-density transient suppression in automotive, industrial, and telecom systems where compact size, AEC-Q101 compliance, and consistent clamping behavior under surge stress are critical.
FAQ
What is the clamping voltage of the SMA5J18AHM3_A/H under full-rated surge conditions?
The SMA5J18AHM3_A/H clamps to 29.2 V at its rated peak pulse current of 17.1 A (10/1000 µs waveform). This value is measured per ANSI/IEEE C62.35 standards and reflects actual voltage seen by protected circuitry during worst-case transient events, ensuring downstream components remain within safe operating limits.
Is SMA5J18AHM3_A/H qualified for automotive applications?
Yes, SMA5J18AHM3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation stating "AEC-Q101 qualified available" with base P/NHM3_X designation. It meets stress tests including HTGB, H3TRB, and temperature cycling required for under-hood and chassis-mounted automotive electronics.
What does the "HM3" suffix indicate in SMA5J18AHM3_A/H?
The "HM3" suffix in SMA5J18AHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering guide, HM3 parts meet JESD201 Class 2 whisker resistance and UL 94 V-0 flammability, distinguishing them from E3 (RoHS only) and HE3 (AEC-Q101 but not halogen-free) variants.
What is the maximum operating temperature for SMA5J18AHM3_A/H?
The SMA5J18AHM3_A/H has a maximum junction temperature (TJ max) of +150 °C and operates across -55 °C to +150 °C. This rating is validated per thermal characterization data and supports use in under-hood automotive environments and high-ambient industrial enclosures without derating below full power.
How does the SMA5J18AHM3_A/H compare to bidirectional TVS diodes like SMA5J18CA?
SMA5J18AHM3_A/H is unidirectional and intended for DC rail protection with polarity-sensitive placement (cathode to line), whereas SMA5J18CA is bidirectional and symmetrical for AC or floating signal line protection. They share identical VWM/VBR/VC specs but differ in polarity handling, leakage profile, and application context - SMA5J18AHM3_A/H is not interchangeable with SMA5J18CA without circuit redesign.
SMA5J18AHM3_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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 17.1A
- Power - Peak Pulse:
- 500W
- 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)
SMA5J18AHM3_A/H FAQ
1.How can I place an order for SMA5J18AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J18AHM3_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 SMA5J18AHM3_A/H reliable?
The price and inventory of SMA5J18AHM3_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 SMA5J18AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMA5J18AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J18AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J18AHM3_A/H?
SMA5J18AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J18AHM3_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 SMA5J18AHM3_A/H?
For technical support, including SMA5J18AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J18AHM3_A/H requirements.
6.How does Aetrix verify that SMA5J18AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMA5J18AHM3_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 SMA5J18AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMA5J18AHM3_A/H?
All SMA5J18AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J18AHM3_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 SMA5J18AHM3_A/H part is unused and in its original packaging.
Return procedure for SMA5J18AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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