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Vishay General Semiconductor - Diodes Division SMA5J18AHM3_A/I
- Part No.:
- SMA5J18AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J18AHM3_A/I.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,436
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Product details
Overview
SMA5J18AHM3_A/I 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), 500 W peak pulse power (PPPM), and clamps transients to ≤29.2 V at 17.1 A IPPM - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMA5J18AHM3_A/I datasheet, SMA5J18AHM3_A/I pinout, SMA5J18AHM3_A/I application, or SMA5J18AHM3_A/I equivalent, key selection criteria include its AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, 150 °C max junction temperature, and suitability for 10/1000 μs surge waveforms per IEC 61000-4-5.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging glass-passivated silicon junction technology for stable avalanche behavior under repetitive surge stress. Its low incremental surge resistance and fast response time (<1 ns) enable effective suppression of ESD, lightning-induced transients, and inductive switching spikes.
Thermal performance is defined by RθJA = 80 °C/W (on 5.0 mm × 5.0 mm copper pads) and RθJL = 25 °C/W, supporting reliable operation up to TJ = 150 °C. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification for automotive-grade reliability.
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 - guaranteed avalanche onset range for predictable turn-on threshold |
| VC @ IPPM | ≤29.2 V at 17.1 A - clamped voltage during 10/1000 μs surge, defining worst-case stress on protected circuit |
| PPPM | 500 W - peak transient power handling capability under standardized 10/1000 μs waveform |
| ID @ VWM | ≤1.0 μA - ultra-low leakage current ensures minimal standby power loss and signal integrity |
| TJ max | 150 °C - maximum junction temperature enabling use in under-hood automotive and industrial environments |
| Package | SMA (DO-214AC) - surface-mount package with 5.28 mm × 4.50 mm footprint, compatible with automated placement |
Pinout & Package
SMA (DO-214AC) package: molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 (260 °C reflow peak), cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path (cathode-banded end is opposite) | Connected to ground or low-side return in unidirectional clamp configuration |
| Cathode | Avalanche clamping node (marked with band) | Connected to protected line (e.g., 12 V rail or sensor input) to shunt surges to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control units and body electronics |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for global OEM supply chains |
| Low incremental surge resistance | Enables tighter clamping voltage margin and reduced energy dissipation in protected ICs |
| Glass passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity stress |
| MSL Level 1 rating | Supports standard SMT reflow without pre-baking, reducing manufacturing complexity |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between power rail and chassis ground. Use Value: Limits transient voltage to ≤29.2 V, preventing damage to downstream DC-DC converters and microcontrollers. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure or temperature sensors) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Point-of-entry protection on signal lines entering industrial PLC modules. Use Value: Sub-1 ns response ensures clamping occurs before sensitive op-amps or ADC inputs are overstressed. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feeds |
Use Scenario: Safeguarding AC/DC adapter primary-side rectifier and controller ICs from surge coupling via mains input. IC Role / Device Role / Timing Role: Secondary-side TVS on 19 V output rail to absorb reflected transients. Use Value: 500 W PPPM rating handles repeated 10/1000 μs surges without degradation over product lifetime. |
Use Scenario: Protecting PoE-powered equipment (e.g., IP cameras) from induced surges on 48 V DC feed lines. IC Role / Device Role / Timing Role: Bidirectional-capable variant not applicable; this unidirectional part used with explicit polarity alignment. Use Value: 1.0 μA ID at 18 V minimizes quiescent current draw critical for always-on telecom nodes. |
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_A/I | Same electrical specs, but RoHS-compliant commercial grade (not AEC-Q101 qualified); E3 suffix, no halogen-free requirement | Suitable for non-automotive industrial or consumer designs where automotive qualification is unnecessary | Select when cost sensitivity outweighs AEC-Q101 requirement and halogen-free mandate is not enforced |
| SMA6J18A-M3/5A | 600 W PPPM rating, same VWM/VBR range, identical SMA package; higher surge capacity due to larger die | Better suited for systems requiring higher immunity margins (e.g., outdoor telecom enclosures) | Choose when design requires >500 W surge handling while retaining same board footprint and layout |
Compared with SMA5J18AHM3_A/I, SMA5J18AHE3_A/I offers identical clamping performance without automotive qualification, while SMA6J18A-M3/5A delivers 20 % higher peak power handling in the same form factor - enabling robustness upgrades without PCB redesign.
Availability
SMA5J18AHM3_A/I is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, and telecom DC feed applications requiring stable component supply with full traceability and lifecycle management.
Supply support for SMA5J18AHM3_A/I 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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMA5Jxx series was engineered for high-power-density transient suppression in space-constrained automotive and industrial systems, balancing clamping precision, surge endurance, and manufacturability in standard SMT packages.
FAQ
What is the maximum clamping voltage of the SMA5J18AHM3_A/I under a 10/1000 μs surge?
The SMA5J18AHM3_A/I clamps to a maximum of 29.2 V when subjected to its rated peak pulse current of 17.1 A under a 10/1000 μs waveform. This value is measured at the device terminals and defines the upper voltage limit imposed on protected circuitry during surge events. The SMA5J18AHM3_A/I datasheet specifies this parameter under standard test conditions with 5.0 mm × 5.0 mm copper pads.
Is the SMA5J18AHM3_A/I suitable for automotive applications?
Yes, the SMA5J18AHM3_A/I is AEC-Q101 qualified and carries the HM3 suffix, indicating halogen-free, RoHS-compliant construction validated for automotive use. It supports operating junction temperatures up to 150 °C and meets MSL Level 1 reflow requirements - making it appropriate for engine control units, body electronics, and ADAS power domains. The SMA5J18AHM3_A/I is explicitly listed in Vishay's AEC-Q101 qualified product matrix.
What does the "HM3" suffix mean in SMA5J18AHM3_A/I?
The "HM3" suffix in SMA5J18AHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. "H" indicates the AEC-Q101 grade, "M3" specifies halogen-free and RoHS compliance, and "_A/I" refers to the packaging variant: 13-inch tape-and-reel (I) with 7500-unit quantity. This distinguishes it from E3 (RoHS only) or HE3 (AEC-Q101 + RoHS, non-halogen-free) variants.
How does the SMA5J18AHM3_A/I compare to bidirectional TVS diodes?
The SMA5J18AHM3_A/I is unidirectional and must be installed with correct polarity - cathode toward the protected line. Unlike bidirectional types (e.g., SMA5J18CA), it conducts forward current below ~3.5 V and blocks reverse voltage up to 18 V. This makes it ideal for DC power rails where polarity is fixed, offering lower leakage and sharper clamping than bidirectional equivalents at the same VWM.
What is the thermal resistance of the SMA5J18AHM3_A/I in typical PCB mounting?
The SMA5J18AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, and a junction-to-lead resistance (RθJL) of 25 °C/W. These values assume standard JEDEC test conditions and directly impact power derating above 25 °C ambient - for example, at 85 °C ambient, its usable PPPM drops to ~350 W per Vishay's derating curve.
SMA5J18AHM3_A/I 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/I FAQ
1.How can I place an order for SMA5J18AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J18AHM3_A/I 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/I reliable?
The price and inventory of SMA5J18AHM3_A/I 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/I is usually 5 days.
3.What payment methods are accepted for SMA5J18AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J18AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J18AHM3_A/I?
SMA5J18AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J18AHM3_A/I 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/I?
For technical support, including SMA5J18AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J18AHM3_A/I requirements.
6.How does Aetrix verify that SMA5J18AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMA5J18AHM3_A/I 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/I meets industry standards.
7.What is the process for return or replacement of SMA5J18AHM3_A/I?
All SMA5J18AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J18AHM3_A/I, 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/I part is unused and in its original packaging.
Return procedure for SMA5J18AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA5J18AHM3_A/I Tags
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