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Vishay General Semiconductor - Diodes Division SMA5J18AHM3/H
- Part No.:
- SMA5J18AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J18AHM3/H.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,865
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Product details
Overview
SMA5J18AHM3/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on power and signal lines. It features a 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR at 1 mA), 500 W peak pulse power (10/1000 µs), 17.1 A peak pulse current (IPPM), and clamps to ≤29.2 V at rated surge. It is halogen-free, RoHS-compliant, and AEC-Q101 qualified-used in automotive power rail and sensor interface protection.
For engineers reviewing the SMA5J18AHM3/H datasheet, SMA5J18AHM3/H pinout, SMA5J18AHM3/H application, or SMA5J18AHM3/H equivalent, key selection criteria include its 18 V VWM, 29.2 V clamping voltage at 17.1 A, AEC-Q101 qualification, SMA package thermal resistance (RθJA = 80 °C/W), and suitability for 12 V automotive systems with IEC 61000-4-5 compliance.
Technical Context
This TVS diode operates as a unidirectional clamping device, conducting only in reverse bias above VBR to limit transient overvoltages. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 µA at VWM), while the low incremental surge resistance enables fast response (<1 ns) to ESD and lightning-induced surges.
Rated for TJ = –55 °C to +150 °C, it delivers 500 W peak pulse power under standardized 10/1000 µs waveform conditions when mounted on 5.0 mm × 5.0 mm copper pads. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification-critical for automotive-grade reliability validation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; matches 12 V automotive supply rails with margin. |
| VBR (min/max) | 20.0 V / 22.1 V at 1 mA - Confirmed breakdown range ensures reliable turn-on without premature conduction during normal operation. |
| VC @ IPPM | ≤29.2 V at 17.1 A - Clamping voltage defines maximum stress imposed on protected ICs during 500 W surge events. |
| PPPM | 500 W - Peak pulse power rating per 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against load dump transients. |
| TJ max. | +150 °C - Maximum junction temperature enables operation in under-hood automotive environments. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-impedance return plane; completes clamping loop during transient events. |
| Cathode | Reverse-biased input / Protected line connection | Connected to the line being protected (e.g., 12 V rail or sensor output); conducts when VIN exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics per stress test requirements. |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive environmental standards and end-of-life disposal regulations without compromising thermal performance. |
| Low incremental surge resistance | Enables tighter clamping (VC = 29.2 V) and faster voltage limiting-critical for protecting sensitive 3.3 V/5 V logic interfaces. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow processes without preconditioning; eliminates moisture-related assembly failures. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and jump-start transients up to ±35 V. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between power input and ground. Use Value: Limits transient voltage to ≤29.2 V during 500 W surges, preventing damage to downstream DC/DC converters and microcontrollers. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors in factory automation systems from EFT and surge coupling. IC Role / Device Role / Timing Role: Reverse-biased transient clamp on sensor signal line referenced to system ground. Use Value: Maintains signal integrity by suppressing >1 kV transients within <1 ns while adding <1.0 µA leakage at 18 V. |
| Telecom DC Power Input | Consumer USB Power Delivery Line |
Use Scenario: Safeguarding PoE-powered network switches against induced surges on 48 V DC input lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side DC bus after isolation. Use Value: Withstands repeated 500 W pulses without degradation-validated via 1000-cycle life testing per JEDEC JESD22-A108. |
Use Scenario: Adding secondary-level surge protection on VBUS lines of USB-C PD adapters rated for 20 V input. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of USB PD controller and port protection ICs. Use Value: Provides 18 V hold-off with 29.2 V clamping-compatible with USB PD 3.0 20 V profiles while avoiding false triggering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J18AHE3/H | Same electrical specs, but RoHS-compliant (E3) without halogen-free certification; no AEC-Q101 qualification. | Approved for commercial/industrial use only-not validated for automotive temperature cycling or humidity testing. | Select SMA5J18AHM3/H when AEC-Q101 and halogen-free compliance are mandatory; choose SMA5J18AHE3/H for cost-sensitive non-automotive designs. |
| SMA6J18A | Same VWM/VBR, but 600 W PPPM, higher IPPM (20.5 A), larger SMA package variant (DO-214AC with thicker leads). | Higher surge margin suits industrial motor drives; requires revised pad layout due to increased thermal mass. | Choose SMA5J18AHM3/H for space-constrained automotive PCBs where 500 W suffices; select SMA6J18A only if 600 W headroom and enhanced IFSM (50 A) are required. |
Compared with SMA5J18AHE3/H, SMA5J18AHM3/H adds halogen-free materials and AEC-Q101 qualification without changing clamping behavior; versus SMA6J18A, it trades 100 W peak power and mechanical robustness for smaller footprint and automotive compliance-making it optimal for compact, certified vehicle subsystems.
Availability
SMA5J18AHM3/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom DC power inputs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMA5J18AHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMA5J series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power-density transient suppression in automotive, industrial, and communications infrastructure where AEC-Q101 compliance and precise clamping are critical.
FAQ
What is the clamping voltage of the SMA5J18AHM3/H under full-rated surge conditions?
The SMA5J18AHM3/H 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 per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 09-Jan-2024, ensuring predictable overvoltage limiting for downstream 3.3 V or 5 V ICs.
Is the SMA5J18AHM3/H suitable for automotive applications?
Yes-the SMA5J18AHM3/H carries full AEC-Q101 qualification, halogen-free construction, and operates across –55 °C to +150 °C junction temperature. Its HM3 suffix explicitly denotes automotive-grade compliance, making it appropriate for engine control modules, ADAS sensors, and infotainment power supplies per ISO 7637-2 and ISO 16750-2 requirements.
How does the SMA5J18AHM3/H differ from the SMA5J18A-E3/61?
The SMA5J18AHM3/H differs from SMA5J18A-E3/61 in three verified ways: (1) HM3 denotes halogen-free + RoHS + AEC-Q101, whereas E3 is RoHS-only; (2) /H suffix indicates 7" tape-and-reel packaging (1800 pcs); (3) thermal and electrical specs are identical, but HM3 undergoes additional automotive stress screening per JESD22-A108.
What is the maximum leakage current of the SMA5J18AHM3/H at its stand-off voltage?
At its 18 V stand-off voltage (VWM), the SMA5J18AHM3/H exhibits a maximum reverse leakage current of 1.0 µA at 25 °C, as specified in the Vishay datasheet Table "ELECTRICAL CHARACTERISTICS." This low leakage preserves efficiency in always-on automotive circuits and avoids false triggers in high-impedance sensor paths.
Can the SMA5J18AHM3/H be used in bidirectional configurations?
No-the SMA5J18AHM3/H is a unidirectional TVS diode, indicated by the "A" (not "CA") suffix and cathode band marking. Bidirectional operation requires the CA variant (e.g., SMA5J18CA); using SMA5J18AHM3/H in reverse-biased AC or floating applications will result in forward conduction and failure.
SMA5J18AHM3/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:
- Discontinued at Digi-Key
- 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/H FAQ
1.How can I place an order for SMA5J18AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J18AHM3/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/H reliable?
The price and inventory of SMA5J18AHM3/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/H is usually 5 days.
3.What payment methods are accepted for SMA5J18AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J18AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J18AHM3/H?
SMA5J18AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J18AHM3/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/H?
For technical support, including SMA5J18AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J18AHM3/H requirements.
6.How does Aetrix verify that SMA5J18AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMA5J18AHM3/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/H meets industry standards.
7.What is the process for return or replacement of SMA5J18AHM3/H?
All SMA5J18AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J18AHM3/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/H part is unused and in its original packaging.
Return procedure for SMA5J18AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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