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Vishay General Semiconductor - Diodes Division SMA5J18CAHE3_A/H
- Part No.:
- SMA5J18CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J18CAHE3_A/H.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,384
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Product details
Overview
SMA5J18CAHE3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on signal and power 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 ≤27.6 V at 17.1 A IPPM - used in automotive sensor interfaces, industrial I/O protection, and telecom line conditioning.
For engineers reviewing the SMA5J18CAHE3_A/H datasheet, SMA5J18CAHE3_A/H pinout, SMA5J18CAHE3_A/H application, or SMA5J18CAHE3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 150 °C junction temperature rating, low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamped crowbar during ESD or lightning-induced transients, leveraging an avalanche breakdown mechanism across both polarities. Its bidirectional symmetry ensures identical VBR min/max (20.0 V / 22.1 V), ID ≤1.0 μA at VWM, and VC = 27.6 V at IPPM = 17.1 A under 10/1000 μs waveform.
Thermally, it exhibits RθJA = 80 °C/W and RθJL = 25 °C/W, enabling reliable operation up to TJ = 150 °C. The glass-passivated junction and matte tin-plated leads meet J-STD-002 solderability and JESD201 Class 2 whisker resistance requirements.
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 - guaranteed avalanche initiation range at 1 mA test current |
| VC @ IPPM | 27.6 V at 17.1 A - clamped voltage during 10/1000 μs surge, defining protected circuit stress level |
| PPPM | 500 W - peak transient energy handling capacity under standardized surge waveform |
| TJ max. | 150 °C - maximum junction temperature supporting automotive under-hood and industrial ambient use |
| Polarity | Bidirectional - symmetrical clamping in both directions, no polarity marking required |
| Package | SMA (DO-214AC) - surface-mount outline with 5.28 mm length, 4.50 mm width, 2.29 mm height |
Pinout & Package
Package: SMA (DO-214AC), molded epoxy case meeting UL 94 V-0; matte tin-plated leads; no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (unmarked) | Transient conduction path | Both terminals function identically - bidirectional avalanche conduction enables symmetric clamping without orientation dependency |
| Case (body) | Thermal and mechanical interface | Non-electrical; provides thermal path to PCB copper pads (0.2" × 0.2" per terminal recommended) |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment power rails |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns |
| Glass-passivated junction | Enhances long-term reliability and stability of VBR under thermal cycling and humidity stress |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a) |
| 500 W peak pulse power | Supports robust protection against IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges on 12 V/24 V systems |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector entry point to shunt transients before reaching sensitive ICs. Use Value: Clamps 10/1000 μs surges to ≤27.6 V while maintaining <1.0 μA leakage at 18 V, preserving signal integrity and ADC accuracy. | Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to inductive switching noise from solenoids and relays. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor on 24 V DC input lines to absorb repetitive switching spikes. Use Value: Withstands 500 W peak pulses and operates continuously from −55 °C to +150 °C, ensuring uptime in harsh factory environments. |
| Telecom Line Interface | Consumer Power Adapter Output |
Use Scenario: Shielding Ethernet PHYs and PoE injectors from induced surges on outdoor cabling in security camera systems. IC Role / Device Role / Timing Role: Primary-level surge suppression ahead of secondary TVS arrays and common-mode chokes. Use Value: Bidirectional symmetry eliminates polarity concerns during field installation; low capacitance avoids signal degradation on 100BASE-TX lines. | Use Scenario: Secondary-side overvoltage protection on 12 V/19 V outputs of AC-DC adapters for laptops and monitors. IC Role / Device Role / Timing Role: Final-stage clamp preventing downstream damage from regulator failure or capacitor discharge events. Use Value: AEC-Q101 qualification ensures consistent performance across production batches, critical for consumer brand reliability 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 |
|---|---|---|---|
| SMA5J18CAHM3_A/H | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification | Required where halogen-free material compliance is mandated (e.g., EU medical or public infrastructure projects) | Select SMA5J18CAHM3_A/H when halogen-free bill-of-materials is contractually specified |
| SMA6J18CAHE3_A/H | 600 W PPPM rating, same VWM/VBR/VC, larger thermal mass (SMA6J package: DO-214AB) | Preferred for higher-energy threat environments (e.g., 12 V battery rail in commercial vehicles with frequent load dump) | Choose SMA6J18CAHE3_A/H when system-level testing reveals margin shortfall with 500 W clamping capability |
Compared with SMA5J18CAHE3_A/H, SMA5J18CAHM3_A/H offers identical protection performance with halogen-free construction, while SMA6J18CAHE3_A/H delivers 20 % higher surge energy handling in a physically larger package - both require layout review due to differing footprints and thermal pad requirements.
Availability
SMA5J18CAHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line conditioning, and consumer power adapter output protection requiring stable component supply and AEC-Q101 traceability.
Supply support for SMA5J18CAHE3_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, MOSFETs, and TVS devices with emphasis on reliability, power density, and automotive-grade qualification.
The SMA5J series is engineered for high-power-density transient suppression in space-constrained SMT designs, targeting automotive, industrial, and telecom applications where bidirectional clamping and AEC-Q101 compliance are mandatory.
FAQ
What is the breakdown voltage range for SMA5J18CAHE3_A/H?
The SMA5J18CAHE3_A/H has a guaranteed breakdown voltage (VBR) range of 20.0 V to 22.1 V at 1 mA test current, measured across both polarities due to its bidirectional construction. This range ensures consistent clamping behavior regardless of transient polarity and aligns with the 18 V stand-off voltage (VWM) specification. The device meets ANSI/IEEE C62.35 standards for transient suppressors.
Is SMA5J18CAHE3_A/H qualified for automotive applications?
Yes, SMA5J18CAHE3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation revision 09-Jan-2024. It is rated for operation from −55 °C to +150 °C junction temperature and passes MSL Level 1 reflow requirements. This makes SMA5J18CAHE3_A/H suitable for under-hood and cabin-mounted automotive electronics including body control modules and ADAS sensor interfaces.
What is the maximum clamping voltage of SMA5J18CAHE3_A/H under surge conditions?
The SMA5J18CAHE3_A/H clamps to a maximum of 27.6 V when subjected to its rated peak pulse current (IPPM) of 17.1 A under the standard 10/1000 μs waveform. This clamping voltage defines the upper voltage stress imposed on downstream circuitry during transient events and is measured with the device mounted on 0.2" × 0.2" copper pads per Vishay's thermal test condition.
Does SMA5J18CAHE3_A/H have polarity markings on the package?
No, SMA5J18CAHE3_A/H does not feature polarity markings because it is a bidirectional TVS diode. Unlike unidirectional variants (e.g., SMA5J18A), the SMA5J18CAHE3_A/H functions identically in both directions - the absence of a cathode band eliminates orientation constraints during PCB assembly and simplifies layout verification.
What is the thermal resistance from junction to ambient for SMA5J18CAHE3_A/H?
The SMA5J18CAHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W when mounted on the recommended 0.2" × 0.2" copper pads per terminal. Its junction-to-lead resistance (RθJL) is 25 °C/W. These values support thermal design validation for continuous operation at up to 150 °C junction temperature in compact, high-density layouts.
SMA5J18CAHE3_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:
- -
- Bidirectional Channels:
- 1
- 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)
SMA5J18CAHE3_A/H FAQ
1.How can I place an order for SMA5J18CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J18CAHE3_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 SMA5J18CAHE3_A/H reliable?
The price and inventory of SMA5J18CAHE3_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 SMA5J18CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMA5J18CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J18CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J18CAHE3_A/H?
SMA5J18CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J18CAHE3_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 SMA5J18CAHE3_A/H?
For technical support, including SMA5J18CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J18CAHE3_A/H requirements.
6.How does Aetrix verify that SMA5J18CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMA5J18CAHE3_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 SMA5J18CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMA5J18CAHE3_A/H?
All SMA5J18CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J18CAHE3_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 SMA5J18CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMA5J18CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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