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Vishay General Semiconductor - Diodes Division 1.5SMC27CAHE3/9AT
- Part No.:
- 1.5SMC27CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC27CAHE3/9AT.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:7,787
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Product details
Overview
1.5SMC27CAHE3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMC (DO-214AB) package, featuring a 23.1 V stand-off voltage (VWM), 25.7–28.4 V breakdown voltage (VBR) at 1 mA, 37.5 V maximum clamping voltage (VC) at 40 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 μs waveform. It protects signal lines and power rails in automotive sensor units, industrial I/O interfaces, and telecom surge-prone circuits.
For engineers reviewing the 1.5SMC27CAHE3/9AT datasheet, 1.5SMC27CAHE3/9AT pinout, 1.5SMC27CAHE3/9AT application, or 1.5SMC27CAHE3/9AT equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification for automotive use, low incremental surge resistance, fast response time (<1 ns), and compatibility with automated SMT placement on standard PCB pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ at VWM), then rapidly avalanches into low-impedance conduction when transient voltage exceeds VBR, diverting surge energy to ground while limiting downstream voltage to ≤37.5 V. Its glass-passivated junction ensures stable breakdown and long-term reliability.
The 1.5SMC27CAHE3/9AT is rated for repetitive 10/1000 μs surges at 0.01% duty cycle, supports 200 A non-repetitive forward surge (unidirectional mode only), and maintains operation across –65 °C to +150 °C junction temperature range. Thermal resistance is 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-leads) on recommended 8.0 mm × 8.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 23.1 V - Maximum continuous reverse working voltage before leakage exceeds 1 μA; defines safe operating margin below clamping threshold. |
| VBR (Breakdown) | 25.7–28.4 V at 1 mA - Voltage at which device enters avalanche conduction; tight tolerance enables precise overvoltage protection. |
| VC (Clamping) | 37.5 V at 40 A - Maximum voltage seen by protected circuit during 10/1000 μs surge; determines stress on downstream ICs/MOSFETs. |
| PPPM | 1500 W - Peak pulse power handling with 10/1000 μs waveform; supports robust lightning and ESD immunity per IEC 61000-4-5. |
| IPPM | 40 A - Peak pulse current corresponding to VC; defines minimum surge current the device can safely clamp without failure. |
| TJ max. | +150 °C - Maximum junction temperature; allows operation in under-hood automotive or high-ambient industrial environments. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing; suitable for ASIL-B systems. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no polarity marking - both terminals are electrically symmetric and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (bidirectional) | Surge current path | Either terminal conducts during positive or negative transients; no cathode band marking required for CA devices. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled or differential signal lines (e.g., RS-485, CAN, USB) without polarity constraints. |
| 1500 W peak pulse power | Withstands 10/1000 μs surges up to 40 A - meets Level 4 IEC 61000-4-5 (4 kV line-to-line, 2 kV line-to-ground). |
| Glass passivated junction | Ensures stable VBR over lifetime and improved moisture resistance vs. epoxy-passivated alternatives. |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles without preconditioning; eliminates moisture-related popcorning risk. |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive applications including engine control modules, ADAS sensors, and body electronics. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) in engine bay modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt TVS diode placed directly at connector entry point to clamp transients before reaching MCU ADC or LIN transceiver. Use Value: Limits voltage to ≤37.5 V during 100 V/50 ms load dump events, preventing latch-up or gate oxide damage in 3.3 V/5 V signal chain components. |
Use Scenario: Safeguarding 24 V DC input terminals of PLC digital input cards against field-wiring induced surges and inductive kickback. IC Role / Device Role / Timing Role: Primary front-end surge suppressor in parallel with input filter capacitor, responding within <1 ns to fast-rising transients. Use Value: Absorbs 1500 W peak energy without degradation, enabling compliance with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) immunity standards. |
| Telecom Line Protection | Consumer Power Adapter Input |
Use Scenario: Secondary-side protection on Ethernet PHY power rails (e.g., 3.3 V bias supply) in PoE-powered switches and IP cameras. IC Role / Device Role / Timing Role: Bidirectional clamp between VCC and GND to suppress common-mode surges coupled onto DC bias lines via transformer parasitics. Use Value: Maintains ≤37.5 V clamping during 10/1000 μs surges, preserving integrity of isolated DC-DC controllers and PHY ICs with 4.5 V absolute max ratings. |
Use Scenario: Input-stage transient suppression on 12 V secondary side of wall adapters powering smart home hubs and IoT gateways. IC Role / Device Role / Timing Role: Low-capacitance (≈200 pF) TVS placed after primary EMI filter but before DC-DC converter input capacitor. Use Value: Prevents surge-induced reset or brownout in downstream buck converters by limiting input rail overshoot to safe levels during plug-in transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA | Lower PPPM (600 W), smaller SMB package (DO-214AA), VC = 38.9 V at 15.4 A | Lower surge capacity; suited for space-constrained consumer electronics with moderate threat levels. | Select when board area is critical and peak surge current remains below 15 A. |
| SMCJ24CA | Same SMC package, higher PPPM (3000 W), VC = 38.9 V at 77.5 A, wider VBR tolerance (22.8–25.2 V) | Higher surge margin for harsher environments (e.g., railway, heavy industrial); larger footprint not required. | Choose for mission-critical systems needing >1500 W headroom or extended lifetime under repetitive surges. |
Compared with 1.5SMC27CAHE3/9AT, SMBJ24CA offers reduced board area but sacrifices 60% peak power handling and requires derating for automotive-grade reliability, while SMCJ24CA delivers double the surge capacity in identical packaging-making it ideal for designs anticipating elevated threat severity without layout changes.
Availability
1.5SMC27CAHE3/9AT is available at Aetrix Electronics and suitable for automotive sensor modules, industrial programmable logic controllers, and telecom infrastructure equipment requiring stable component supply, AEC-Q101 qualification, and consistent 1500 W surge performance across production batches.
Supply support for 1.5SMC27CAHE3/9AT 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The 1.5SMC Series targets high-energy transient suppression in automotive, industrial, and telecom systems where robustness, AEC-Q101 compliance, and standardized SMC packaging are essential design requirements.
FAQ
What does the "CA" suffix indicate in 1.5SMC27CAHE3/9AT?
The "CA" suffix denotes a bidirectional configuration - meaning the 1.5SMC27CAHE3/9AT provides symmetrical clamping for both positive and negative voltage transients without polarity sensitivity. This differs from unidirectional "A" variants, which require correct anode/cathode orientation and only protect against one polarity of surge. The CA version is used where AC signals, differential buses, or unknown polarity connections demand full-spectrum protection.
Is 1.5SMC27CAHE3/9AT suitable for automotive applications?
Yes - the "HE3" suffix confirms that 1.5SMC27CAHE3/9AT is AEC-Q101 qualified, having passed rigorous automotive reliability tests including temperature cycling, high-temperature reverse bias, and ESD. It is approved for use in engine control units, body electronics, ADAS sensors, and infotainment systems where sustained operation from –40 °C to +125 °C ambient and immunity to load dump pulses are mandatory.
How does the clamping voltage of 1.5SMC27CAHE3/9AT compare to its breakdown voltage?
The 1.5SMC27CAHE3/9AT has a breakdown voltage (VBR) range of 25.7–28.4 V at 1 mA test current, while its maximum clamping voltage (VC) is 37.5 V at 40 A peak pulse current. This 9.1–11.8 V difference represents the dynamic voltage rise under surge conditions - a critical parameter for ensuring protected ICs remain below their absolute maximum voltage ratings during transient events.
What is the thermal resistance of 1.5SMC27CAHE3/9AT, and how does it affect PCB layout?
The 1.5SMC27CAHE3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To maintain safe junction temperatures under repeated surges, designers must implement these minimum pad sizes and avoid excessive trace length or narrow traces that increase thermal impedance. Smaller pads raise RθJA, risking thermal runaway during high-duty-cycle events.
Can 1.5SMC27CAHE3/9AT be used in place of a unidirectional TVS like 1.5SMC27AHE3/9AT?
No - 1.5SMC27CAHE3/9AT is bidirectional and lacks polarity marking, while 1.5SMC27AHE3/9AT is unidirectional with a cathode band. Substituting them requires verifying circuit topology: bidirectional use is mandatory for AC-coupled or floating lines (e.g., RS-485), whereas unidirectional types are preferred for DC power rails where polarity is fixed and lower leakage at VWM is beneficial. Interchangeability is not guaranteed without schematic and layout review.
1.5SMC27CAHE3/9AT 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):
- 23.1V
- Voltage - Breakdown (Min):
- 25.7V
- Voltage - Clamping (Max) @ Ipp:
- 37.5V
- Current - Peak Pulse (10/1000µs):
- 40A
- 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)
1.5SMC27CAHE3/9AT FAQ
1.How can I place an order for 1.5SMC27CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC27CAHE3/9AT 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 1.5SMC27CAHE3/9AT reliable?
The price and inventory of 1.5SMC27CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC27CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC27CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC27CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC27CAHE3/9AT?
1.5SMC27CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC27CAHE3/9AT 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 1.5SMC27CAHE3/9AT?
For technical support, including 1.5SMC27CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC27CAHE3/9AT requirements.
6.How does Aetrix verify that 1.5SMC27CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC27CAHE3/9AT 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 1.5SMC27CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC27CAHE3/9AT?
All 1.5SMC27CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC27CAHE3/9AT, 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 1.5SMC27CAHE3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC27CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC27CAHE3/9AT Tags
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