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Vishay General Semiconductor - Diodes Division SMA5J18AHE3_A/I
- Part No.:
- SMA5J18AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J18AHE3_A/I.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,014
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Product details
Overview
SMA5J18AHE3_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 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR), 500 W peak pulse power (PPPM), 17.1 A peak pulse current (IPPM), and clamps transients to ≤29.2 V at rated surge. It is AEC-Q101 qualified and used in automotive sensor interface protection.
For engineers reviewing the SMA5J18AHE3_A/I datasheet, SMA5J18AHE3_A/I pinout, SMA5J18AHE3_A/I application, or SMA5J18AHE3_A/I equivalent, this page delivers verified electrical parameters, thermal derating behavior, junction-to-ambient thermal resistance (80 °C/W), polarity marking convention, and AEC-Q101 qualification status - all critical for robust overvoltage design in automotive and industrial systems.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping device triggered by reverse-biased avalanche breakdown. Its 10/1000 μs waveform response enables suppression of fast transients from inductive switching and ESD events, with clamping voltage tightly bounded at ≤29.2 V under 17.1 A surge current.
Thermal performance is defined by RθJA = 80 °C/W (typical, on 5.0 mm × 5.0 mm copper pads) and TJ range of –55 °C to +150 °C. The device uses glass-passivated chip junction and matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system operating margin. |
| VBR min/max | 20.0 V / 22.1 V - Breakdown occurs within this band at 1 mA test current; defines turn-on threshold tolerance. |
| VC @ IPPM | ≤29.2 V - Clamped voltage during 17.1 A 10/1000 μs surge; determines maximum stress on downstream ICs. |
| PPPM | 500 W - Peak pulse power handling per single transient; defines energy absorption capability. |
| ID @ VWM | ≤1.0 μA - Reverse leakage at 18 V; ensures minimal standby power loss and signal integrity. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments. |
| RθJA | 80 °C/W - Thermal resistance junction-to-ambient on standard pad layout; guides PCB copper area requirements. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with molded UL 94 V-0 compound. Cathode indicated by black band on body end.
| 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 sensor input); reverse-biased during surge. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan. |
| Glass-passivated junction | Enhances long-term stability and moisture resistance versus epoxy-passivated alternatives. |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C / 60 % RH; no bake required prior to reflow. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time). |
| Matte tin-plated leads | Ensures consistent solder wetting and compatibility with lead-free reflow profiles (peak 260 °C). |
Applications
| Automotive Sensor Protection | Industrial Power Rail Clamping |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between sensor supply line and chassis ground. Use Value: Limits transient voltage to ≤29.2 V, preventing damage to 3.3 V or 5 V interface ICs while maintaining <1.0 μA leakage at 18 V nominal rail. | Use Scenario: Safeguarding 12 V/24 V DC power distribution networks in PLC I/O modules against inductive kickback from solenoid drivers. IC Role / Device Role / Timing Role: Standoff-connected TVS across input rail and common ground, activated only during >20 V surges. Use Value: Absorbs 500 W peak energy without degradation, enabling compliance with IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge immunity. |
| Consumer Power Adapter Input | Telecom Line Interface |
Use Scenario: Secondary-side overvoltage protection in AC/DC adapters for USB-C PD and laptop chargers exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS on +VOUT rail referenced to output GND, upstream of DC-DC converters. Use Value: Clamps 10/1000 μs transients to ≤29.2 V with 17.1 A peak current handling, preserving downstream regulator integrity. | Use Scenario: Surge protection on Ethernet PHY power rails (e.g., 3.3 V bias supply) in PoE-powered switches and base stations. IC Role / Device Role / Timing Role: Local clamping element on isolated DC bias line, positioned adjacent to PHY IC. Use Value: Provides <1.0 μA leakage at 18 V standoff, avoiding interference with sensitive analog PHY circuitry while meeting GR-1089-CORE Level 3 requirements. |
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-E3/61 | Same electrical specs, RoHS-compliant commercial grade (non-AEC-Q101), same SMA package. | Lacks automotive qualification; suitable for consumer/industrial use where AEC-Q101 not mandated. | Select when cost sensitivity outweighs automotive qualification requirement and thermal derating matches. |
| SMC5J18AHE3_A/I | Same VWM/VBR/VC specs but in larger SMC (DO-214AB) package; higher IFSM (100 A vs. 40 A) and lower RθJA (35 °C/W). | Better thermal performance and surge endurance; requires larger PCB footprint. | Choose for higher-reliability 12 V systems needing >40 A surge margin or extended thermal headroom. |
Compared with SMA5J18AHE3_A/I, SMA5J18A-E3/61 offers identical clamping performance without AEC-Q101 validation, while SMC5J18AHE3_A/I provides superior thermal dissipation and surge current capacity at the cost of board space - enabling trade-offs between qualification, footprint, and ruggedness.
Availability
SMA5J18AHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial power rail protection, and telecom line bias circuits requiring stable component supply with AEC-Q101 assurance and full traceability.
Supply support for SMA5J18AHE3_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, MOSFETs, and protection devices with emphasis on reliability and application-specific optimization.
The SMA5J series is part of Vishay's TRANSZORB® TVS platform, engineered for high-power-density transient suppression in space-constrained automotive and industrial applications where AEC-Q101 compliance and precise clamping are mandatory.
FAQ
What is the clamping voltage of the SMA5J18AHE3_A/I under its rated surge current?
The SMA5J18AHE3_A/I clamps to a maximum of 29.2 V when subjected to its rated 17.1 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured at the device terminals with specified mounting conditions (0.2" × 0.2" copper pads), and defines the upper voltage limit imposed on protected circuitry during surge events.
Is the SMA5J18AHE3_A/I suitable for automotive applications?
Yes, the SMA5J18AHE3_A/I is AEC-Q101 qualified, with test documentation covering HTOL, temperature cycling, HTRB, and ESD per the AEC stress test plan. Its –55 °C to +150 °C operating junction temperature range and MSL Level 1 rating make it suitable for under-hood and ECU-mounted automotive applications requiring certified transient protection.
How does the SMA5J18AHE3_A/I differ from the SMA5J18A-E3/61?
The SMA5J18AHE3_A/I and SMA5J18A-E3/61 share identical electrical characteristics (VWM = 18 V, VBR = 20.0–22.1 V, VC ≤ 29.2 V), but SMA5J18AHE3_A/I carries AEC-Q101 qualification and uses the HE3 suffix denoting automotive-grade construction, whereas SMA5J18A-E3/61 is commercial-grade RoHS-compliant only.
What is the thermal resistance of the SMA5J18AHE3_A/I, and how does it affect PCB layout?
The SMA5J18AHE3_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. To maintain safe junction temperatures during repeated surges, designers must allocate adequate copper area and avoid excessive trace length or isolation that increases thermal impedance beyond this baseline.
Does the SMA5J18AHE3_A/I have polarity marking, and how is it oriented in circuit?
Yes, the SMA5J18AHE3_A/I is unidirectional and marked with a cathode band on the body. In circuit, the banded end connects to the line being protected (e.g., 12 V rail), while the anode connects to ground - ensuring reverse-biased operation during normal use and avalanche conduction during overvoltage events.
SMA5J18AHE3_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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA5J18AHE3_A/I FAQ
1.How can I place an order for SMA5J18AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J18AHE3_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 SMA5J18AHE3_A/I reliable?
The price and inventory of SMA5J18AHE3_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 SMA5J18AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMA5J18AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J18AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J18AHE3_A/I?
SMA5J18AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J18AHE3_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 SMA5J18AHE3_A/I?
For technical support, including SMA5J18AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J18AHE3_A/I requirements.
6.How does Aetrix verify that SMA5J18AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMA5J18AHE3_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 SMA5J18AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMA5J18AHE3_A/I?
All SMA5J18AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J18AHE3_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 SMA5J18AHE3_A/I part is unused and in its original packaging.
Return procedure for SMA5J18AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA5J18AHE3_A/I Tags
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