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Vishay General Semiconductor - Diodes Division SM15T18CAHE3_A/I
- Part No.:
- SM15T18CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T18CAHE3_A/I.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,841
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Product details
Overview
SM15T18CAHE3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 18 V standoff voltage (VWM), and clamping voltage of 25.2 V at 59.5 A peak pulse current. It protects signal lines and power rails in automotive sensor units and industrial I/O interfaces against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T18CAHE3_A/I datasheet, SM15T18CAHE3_A/I pinout, SM15T18CAHE3_A/I application, or SM15T18CAHE3_A/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, clamping performance under standardized waveforms, and real-world use context for ESD and surge protection design.
Technical Context
The SM15T18CAHE3_A/I operates as a bidirectional avalanche diode with symmetrical breakdown behavior in both polarities, enabling robust protection of AC-coupled or differential signal paths without polarity constraints. Its 10/1000 μs waveform rating reflects standardized lightning surge immunity testing per IEC 61000-4-5.
Thermal resistance is characterized at RθJA = 75 °C/W (typ.) on 8.0 mm × 8.0 mm copper pads, and it features glass-passivated junction construction for stable leakage and long-term reliability under repeated transient stress. The device fails short-circuit in overstress conditions, preserving downstream circuit integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe working range for protected line. |
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - Confirmed breakdown threshold ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 25.2 V at 59.5 A (10/1000 μs) - Clamping voltage limits transient energy delivered to downstream ICs like microcontrollers or transceivers. |
| PPPM | 1500 W - Peak pulse power handling capability meets IEC 61000-4-5 Level 3/4 surge requirements for industrial and automotive applications. |
| TJ max. | +150 °C - Junction temperature limit supports operation in under-hood automotive environments and high-ambient industrial enclosures. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile plastic case with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102. No polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | One terminal of bidirectional avalanche junction | Connects to either side of protected line; symmetric conduction enables AC or differential protection without orientation dependency. |
| Cathode | Other terminal of bidirectional avalanche junction | Electrically identical to Anode in CA-suffix devices; no functional distinction-device operates identically in both directions. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables compliance with IEC 61000-4-5 surge immunity up to 4 kV (line-to-earth) in properly designed PCB layouts. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes voltage overshoot during clamping, reducing stress on 3.3 V or 5 V logic-level interface components. |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive electronics including body control modules, ADAS sensor interfaces, and infotainment I/O protection. |
| MSL Level 1, peak reflow 260 °C | Supports single-pass lead-free reflow assembly without moisture-related popcorning or delamination risk. |
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 inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS placed at connector entry point to clamp ±25 V surges before reaching signal conditioning circuitry. Use Value: Prevents latch-up or permanent damage to 5 V rail-powered op-amps and ADC front-ends during ISO 7637-2 Pulse 1/2a/5a events. |
Use Scenario: Shielding digital input/output channels on programmable logic controllers from field-wiring induced surges due to motor contactor switching or lightning coupling. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted directly at terminal block to shunt >1 kA transients away from optocoupler isolation barriers. Use Value: Maintains functional safety integrity by limiting transient voltage to <25.2 V, well below 30 V absolute maximum ratings of industrial-grade isolators. |
| Telecom Line Interface Protection | Consumer Appliance Power Supply Input |
Use Scenario: Safeguarding Ethernet PHY magnetics and RS-485 transceivers in network edge devices exposed to induced surges via unshielded cabling. IC Role / Device Role / Timing Role: Bidirectional clamping element across differential pairs to suppress common-mode transients without disrupting DC bias. Use Value: Achieves >30 kV ESD contact discharge immunity (IEC 61000-4-2) and 2 kV surge (IEC 61000-4-5) while maintaining <1 pF junction capacitance impact on signal integrity. |
Use Scenario: Suppressing line-to-line and line-to-ground surges entering switch-mode power supplies in white goods and HVAC controllers. IC Role / Device Role / Timing Role: Primary-stage TVS placed after EMI filter but before bridge rectifier to absorb fast-rising transients before bulk capacitor charging. Use Value: Limits peak voltage to 25.2 V during 10/1000 μs surges, preventing overvoltage failure of 400 V-rated electrolytic capacitors and MOSFET gate drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18CA | Lower peak pulse power (400 W), same VWM (18 V), larger VC (29.2 V at 13.7 A) | Not suitable for IEC 61000-4-5 Level 4; limited to lower-energy threats such as ESD and local switching noise. | Select SMAJ18CA only when board space is constrained and surge threat level is ≤1 kV. |
| SMCJ18CA | Same package (SMC), higher PPPM (1500 W), identical VWM/VC, but not AEC-Q101 qualified (E3/M3 suffix only) | Lacks automotive qualification; requires additional reliability validation for vehicle programs. | Choose SMCJ18CA for industrial or telecom use where AEC-Q101 is not mandated and cost sensitivity is higher. |
Compared with SMAJ18CA and SMCJ18CA, SM15T18CAHE3_A/I uniquely combines 1500 W surge capability, AEC-Q101 qualification, and bidirectional symmetry-making it the only option among the three validated for automotive-grade surge protection without derating or supplemental qualification.
Availability
SM15T18CAHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SM15T18CAHE3_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, TVS, MOSFETs, and optoelectronics with emphasis on high-reliability and application-specific performance.
The SM15T Series was engineered specifically for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom systems where failure modes must be controlled and surge immunity must meet international standards.
FAQ
What is the clamping voltage of SM15T18CAHE3_A/I at its rated peak pulse current?
The SM15T18CAHE3_A/I has a maximum clamping voltage (VC) of 25.2 V when subjected to a 10/1000 μs waveform at 59.5 A peak pulse current (IPPM). This value is measured per Figure 1 and Table 1 in Vishay Document 88380 and defines the upper voltage limit imposed on protected circuits during surge events. The SM15T18CAHE3_A/I maintains this clamping performance across its full operating temperature range.
Is SM15T18CAHE3_A/I suitable for automotive applications?
Yes, SM15T18CAHE3_A/I is AEC-Q101 qualified, as confirmed by the "HE3" suffix and documentation in Vishay's SM15T Series datasheet (Rev. 09-Jan-2024). It undergoes stress testing for temperature cycling, high-temperature reverse bias, and ESD per AEC-Q101 requirements. The SM15T18CAHE3_A/I is approved for use in engine control units, body electronics, and ADAS sensor interfaces where transient immunity and long-term reliability are mandatory.
What does the "CA" suffix indicate in SM15T18CAHE3_A/I?
The "CA" suffix in SM15T18CAHE3_A/I denotes a bidirectional configuration-meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional "A" variants, the SM15T18CAHE3_A/I has no polarity marking and functions identically regardless of voltage polarity applied across its terminals, making it ideal for AC signal lines and differential buses.
What is the thermal resistance of SM15T18CAHE3_A/I from junction to ambient?
The typical junction-to-ambient thermal resistance (RθJA) of SM15T18CAHE3_A/I is 75 °C/W, measured on a standard 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad layout per JEDEC test conditions. This value assumes no external heatsinking and guides thermal design for sustained power dissipation up to 6.5 W at +50 °C ambient. The SM15T18CAHE3_A/I also exhibits RθJL = 15 °C/W to the lead, supporting localized heat transfer in compact layouts.
How does SM15T18CAHE3_A/I differ from SM15T18AHE3_A/I?
The SM15T18CAHE3_A/I is bidirectional (CA), whereas SM15T18AHE3_A/I is unidirectional (A). Their VWM (18 V), VBR (17.1–18.9 V), and VC (25.2 V) are identical, but the unidirectional version includes a cathode band marking and conducts only in reverse bias-requiring correct orientation during placement. The SM15T18CAHE3_A/I eliminates orientation concerns and supports AC-coupled or floating signal protection without polarity constraints.
SM15T18CAHE3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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)
SM15T18CAHE3_A/I FAQ
1.How can I place an order for SM15T18CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T18CAHE3_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 SM15T18CAHE3_A/I reliable?
The price and inventory of SM15T18CAHE3_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 SM15T18CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SM15T18CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T18CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T18CAHE3_A/I?
SM15T18CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T18CAHE3_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 SM15T18CAHE3_A/I?
For technical support, including SM15T18CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T18CAHE3_A/I requirements.
6.How does Aetrix verify that SM15T18CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SM15T18CAHE3_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 SM15T18CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SM15T18CAHE3_A/I?
All SM15T18CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM15T18CAHE3_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 SM15T18CAHE3_A/I part is unused and in its original packaging.
Return procedure for SM15T18CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T18CAHE3_A/I Tags
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