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Vishay General Semiconductor - Diodes Division 1.5SMC18CAHE3/9AT
- Part No.:
- 1.5SMC18CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC18CAHE3/9AT.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:6,365
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Product details
Overview
1.5SMC18CAHE3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 1500 W peak pulse power rating (10/1000 μs), 18 V breakdown voltage (VBR min/max = 17.1–18.9 V at 1 mA), and clamps to ≤25.2 V at 59.5 A peak pulse current. It is AEC-Q101 qualified and RoHS-compliant, targeting automotive sensor lines and industrial I/O interfaces.
For engineers reviewing the 1.5SMC18CAHE3/9AT datasheet, 1.5SMC18CAHE3/9AT pinout, 1.5SMC18CAHE3/9AT application, or 1.5SMC18CAHE3/9AT equivalent, this device delivers verified bidirectional clamping performance, MSL Level 1 moisture sensitivity, and validated thermal resistance (RθJA = 75 °C/W) under standard PCB pad layout per JEDEC.
Technical Context
The 1.5SMC18CAHE3/9AT operates as a bidirectional avalanche diode with symmetrical clamping in both polarities, enabling protection against voltage transients from either direction without polarity dependency. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 μA at 15.3 V).
It uses a 10/1000 μs double-exponential surge waveform standard per REA, delivering 1500 W peak pulse power with 0.01 % duty cycle repeatability. Thermal design relies on RθJL = 15 °C/W (junction-to-leads) and requires 8.0 mm × 8.0 mm copper pads per terminal for rated IPPM derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - defines precise avalanche onset threshold for reliable triggering |
| VWM | 15.3 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA |
| VC @ IPPM | 25.2 V at 59.5 A - clamped voltage during full-rated 1500 W transient, limiting stress on downstream ICs |
| PPPM | 1500 W - peak pulse power handling capability with 10/1000 μs waveform, critical for lightning/inductive spike immunity |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| RθJA | 75 °C/W - thermal resistance from junction to ambient, used to calculate safe power dissipation on standard PCB layout |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Bidirectional construction has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | One terminal of symmetrical avalanche junction; conducts during negative surges |
| Cathode | Transient current entry (positive polarity) | Other terminal of symmetrical avalanche junction; conducts during positive surges |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 1500 W peak pulse power | Withstands high-energy transients such as ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 surges |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without preconditioning or baking |
| Glass-passivated junction | Ensures long-term stability of VBR and low leakage across temperature and lifetime |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, ADAS sensors, and body electronics |
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 events in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed at connector interface or IC input pins. Use Value: Limits transient voltage to ≤25.2 V, preventing damage to 3.3 V/5 V sensor signal conditioning circuits while maintaining signal integrity. |
Use Scenario: Safeguarding digital and analog I/O channels of programmable logic controllers against field-induced surges and ground bounce. IC Role / Device Role / Timing Role: Primary overvoltage clamp on isolated or non-isolated input/output terminals. Use Value: Absorbs up to 1500 W surge energy without degradation, ensuring system uptime in factory automation environments. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Front-end protection of Ethernet PHYs, RS-485 transceivers, and PoE-powered devices exposed to lightning-induced surges. IC Role / Device Role / Timing Role: First-line transient suppressor on differential data lines or DC bias rails. Use Value: Symmetrical clamping maintains common-mode noise rejection while suppressing ±25.2 V transients on both conductors. |
Use Scenario: Secondary-side surge suppression in AC/DC adapters for smart home devices, guarding against mains-borne transients. IC Role / Device Role / Timing Role: Clamp on low-voltage DC output rail (e.g., 12 V, 19 V) before LDO or DC-DC regulator. Use Value: Prevents latch-up or burnout of downstream regulators by limiting surge voltage to safe levels within 1 ns response time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA | Lower peak pulse power (600 W), same VBR range (17.1–18.9 V), SMB package (smaller footprint, higher RθJA) | Preferred for space-constrained consumer designs where 600 W surge margin suffices | Select when board area is limited and full 1500 W rating is not required; verify thermal derating on smaller pads |
| 1.5KE18CA | Through-hole TO-204AA (DO-41) package, identical electrical specs but higher mounting thermal resistance and manual assembly requirement | Suitable for legacy industrial equipment or prototyping where through-hole assembly remains standard | Choose only if existing production line lacks SMT capability or mechanical retention demands axial leads |
Compared with SMBJ18CA and 1.5KE18CA, the 1.5SMC18CAHE3/9AT uniquely combines AEC-Q101 qualification, 1500 W surge capacity, and SMC surface-mount compatibility-making it the optimal choice for volume automotive and industrial SMT production requiring high-reliability transient immunity.
Availability
1.5SMC18CAHE3/9AT is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, telecom line interfaces, and consumer power adapter designs requiring stable component supply and long-term lifecycle support.
Supply support for 1.5SMC18CAHE3/9AT 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 automotive-grade validation.
The 1.5SMC Series was developed specifically for high-power, surface-mount transient suppression in harsh environments-including automotive, industrial, and telecom infrastructure-where bidirectional clamping and AEC-Q101 compliance are mandatory.
FAQ
What is the breakdown voltage tolerance of the 1.5SMC18CAHE3/9AT?
The 1.5SMC18CAHE3/9AT has a specified breakdown voltage (VBR) range of 17.1 V to 18.9 V at 1 mA test current, representing a ±5.6% tolerance around the nominal 18 V rating. This tight tolerance ensures consistent clamping behavior across production lots and supports precise circuit protection design without over-engineering margins.
Is the 1.5SMC18CAHE3/9AT unidirectional or bidirectional?
The 1.5SMC18CAHE3/9AT is a bidirectional TVS diode, indicated by the "CA" suffix. It provides symmetrical clamping in both polarities, making it suitable for protecting AC-coupled signals, differential buses (e.g., CAN, RS-485), and floating nodes where voltage transients may occur with either polarity.
Does the 1.5SMC18CAHE3/9AT require a heatsink for 1500 W pulse handling?
No external heatsink is required for single-pulse 1500 W events, as the 1.5SMC18CAHE3/9AT is rated for that power with proper PCB layout: 8.0 mm × 8.0 mm copper pads per terminal. However, repetitive surges demand thermal derating per Figure 2 in the datasheet, and sustained power dissipation must stay below 6.5 W at 50 °C ambient.
What does the "HE3" suffix signify in 1.5SMC18CAHE3/9AT?
The "HE3" suffix in 1.5SMC18CAHE3/9AT denotes RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this automotive-grade variant from commercial-grade "E3" parts, confirming compliance with automotive reliability standards including temperature cycling, highly accelerated life testing (HALT), and ESD robustness per AEC-Q101.
Can the 1.5SMC18CAHE3/9AT be used in place of a unidirectional 1.5SMC18AHE3/9AT?
No-the 1.5SMC18CAHE3/9AT is bidirectional and lacks polarity marking, whereas the unidirectional 1.5SMC18AHE3/9AT has a cathode band and conducts only in reverse bias. Substituting them risks improper clamping or forward conduction in DC-biased circuits; always match device polarity and directionality to the circuit topology.
1.5SMC18CAHE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.2V
- Current - Peak Pulse (10/1000µs):
- 59.5A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
1.5SMC18CAHE3/9AT FAQ
1.How can I place an order for 1.5SMC18CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC18CAHE3/9AT 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 1.5SMC18CAHE3/9AT reliable?
The price and inventory of 1.5SMC18CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC18CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC18CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC18CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC18CAHE3/9AT?
1.5SMC18CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC18CAHE3/9AT 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 1.5SMC18CAHE3/9AT?
For technical support, including 1.5SMC18CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC18CAHE3/9AT requirements.
6.How does Aetrix verify that 1.5SMC18CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC18CAHE3/9AT 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 1.5SMC18CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC18CAHE3/9AT?
All 1.5SMC18CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC18CAHE3/9AT, 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 1.5SMC18CAHE3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC18CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC18CAHE3/9AT Tags
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