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Vishay General Semiconductor - Diodes Division SM15T18CAHE3/57T
- Part No.:
- SM15T18CAHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T18CAHE3/57T.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,069
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Product details
Overview
SM15T18CAHE3/57T from Vishay General Semiconductor is a bidirectional 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 provides robust protection for automotive-grade signal lines and power rails against lightning-induced and switching transients.
For engineers reviewing the SM15T18CAHE3/57T datasheet, SM15T18CAHE3/57T pinout, SM15T18CAHE3/57T application, or SM15T18CAHE3/57T equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification, 1500 W surge capability, low clamping ratio (25.2 V / 18 V = 1.4), and compatibility with high-impedance transient sources in automotive ECUs and sensor interfaces.
Technical Context
This bidirectional TVS diode operates symmetrically across both polarities, with breakdown voltage VBR min/max of 17.1 V / 18.9 V at 1 mA test current and maximum reverse leakage ID ≤ 1.0 μA at 15.3 V standoff. Its clamping performance is specified under standardized 10/1000 μs waveform conditions, with thermal resistance RθJA = 75 °C/W enabling reliable operation up to +150 °C junction temperature.
The device uses glass-passivated silicon junction technology, exhibits low parasitic inductance due to SMC package geometry, and meets J-STD-020 MSL Level 1 with 260 °C lead-free reflow peak. It is qualified per AEC-Q101 for automotive applications and features matte tin-plated leads compliant with JESD 22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 1500 W - sustains single high-energy transients typical of ISO 7637-2 Load Dump or IEC 61000-4-5 surge events |
| Standoff Voltage VWM | 18 V - maximum continuous reverse operating voltage before significant leakage begins |
| Breakdown Voltage VBR | 17.1–18.9 V @ 1 mA - defines onset of avalanche conduction in either polarity |
| Clamping Voltage VC | 25.2 V @ 59.5 A - limits voltage seen by protected circuit during full-rated surge |
| Junction Temperature Range | −65 °C to +150 °C - supports under-hood automotive deployment without derating |
| Package | SMC (DO-214AB) - surface-mount footprint compatible with automated assembly and IPC-7351B land patterns |
| AEC-Q101 Qualified | Yes - validated for automotive reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
SM15T18CAHE3/57T is housed in an SMC (DO-214AB) plastic package with two terminals and no polarity marking-consistent with bidirectional functionality. The case conforms to UL 94 V-0 flammability rating and features matte tin-plated leads suitable for J-STD-002-compliant soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (symmetrical) | No fixed polarity; functions identically as anode or cathode depending on transient polarity |
| Terminal 2 | Anode/Cathode (symmetrical) | Completes bidirectional conduction path; no band marking required |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables protection against severe transients such as ISO 7637-2 Pulse 5a (load dump) without external series impedance |
| Bidirectional clamping | Eliminates need for dual unidirectional devices or polarity-aware layout in AC-coupled or floating signal paths |
| AEC-Q101 qualification | Validates long-term reliability in automotive environments including thermal shock, humidity bias, and mechanical vibration |
| Low clamping ratio (1.4) | Minimizes overvoltage stress on downstream ICs like CAN transceivers or microcontrollers during surge events |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking, reducing manufacturing overhead |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protecting LIN bus transceiver inputs from load dump and battery reversal transients in vehicle door modules. IC Role / Device Role: Bidirectional voltage clamp placed between LIN line and ground, shunting surge energy away from transceiver ESD structures. Use Value: Prevents latch-up or permanent damage to TI SN65HVDA100 or similar LIN PHYs during 12 V system faults while maintaining signal integrity below 25.2 V. |
Use Scenario: Safeguarding 24 V DC digital input channels in programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role: Primary transient suppression element mounted directly at connector entry point before optocoupler input stage. Use Value: Limits transient voltage to ≤25.2 V, ensuring safe operation of PC817 or TLP185 optocouplers rated for 30 V max reverse input voltage. |
| Automotive Camera Sensor Interface | Telecom Base Station Power Monitoring |
Use Scenario: Shielding MIPI CSI-2 data lanes in ADAS camera modules from ESD and board-level coupling during ignition events. IC Role / Device Role: Low-capacitance bidirectional TVS placed across differential pairs near image sensor connector. Use Value: Clamps common-mode surges to 25.2 V without distorting high-speed signals (capacitance not specified but consistent with SMC geometry < 100 pF). |
Use Scenario: Protecting analog monitoring circuits measuring −48 V telecom power supply rail against accidental polarity reversal and lightning-induced surges. IC Role / Device Role: Standoff-limited bidirectional clamp referenced to system ground, absorbing energy before it reaches ADC front-end. Use Value: Maintains 18 V working voltage margin above nominal −48 V rail, clamping reversals to ±25.2 V to prevent op-amp saturation or rail-to-rail latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ18CA | Same 18 V VWM, 1500 W rating, SMA package (smaller footprint, higher RθJA = 90 °C/W) | Lower power density; less suitable for sustained ambient >105 °C without derating | Select when board space is constrained and thermal budget allows higher junction rise |
| ON Semiconductor 1.5KE18CA | Through-hole DO-201 package, identical electrical specs but no AEC-Q101 qualification | Not approved for automotive production; limited to industrial or prototyping use | Choose only for non-automotive applications where reflow compatibility and qualification are not required |
Compared with SMAJ18CA and 1.5KE18CA, SM15T18CAHE3/57T offers superior thermal performance (RθJA = 75 °C/W vs. 90 °C/W), AEC-Q101 validation for automotive deployment, and SMC package compatibility with high-volume SMT lines-making it the preferred choice for production-grade automotive electronics requiring long-term reliability and process consistency.
Availability
SM15T18CAHE3/57T is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC input protection, and telecom power monitoring systems requiring stable component supply, AEC-Q101 compliance, and 1500 W surge immunity.
Supply support for SM15T18CAHE3/57T 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 high-reliability, automotive-qualified components.
The SM15T Series is designed specifically for high-power transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness against lightning, load dump, and inductive switching surges is critical.
FAQ
What does the "CA" suffix indicate in SM15T18CAHE3/57T?
The "CA" suffix in SM15T18CAHE3/57T denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage suppression in both forward and reverse directions. Unlike unidirectional variants (e.g., SM15T18A), SM15T18CAHE3/57T has no polarity marking and clamps equally across its terminals-ideal for AC-coupled or floating signal lines where voltage polarity may reverse during fault conditions.
Is SM15T18CAHE3/57T qualified for automotive use?
Yes, SM15T18CAHE3/57T is AEC-Q101 qualified, as confirmed by its "HE3" suffix and documentation in Vishay's official datasheet (Document Number: 88380, Revision: 09-Jan-2024). This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD, validating its suitability for under-hood and chassis-mounted automotive electronics.
What is the clamping voltage of SM15T18CAHE3/57T at rated peak pulse current?
The clamping voltage VC of SM15T18CAHE3/57T is 25.2 V at 59.5 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured across the device terminals during full-rated surge and represents the maximum voltage imposed on the protected circuit during transient events.
Does SM15T18CAHE3/57T require a heatsink for standard operation?
No, SM15T18CAHE3/57T does not require an external heatsink for single-pulse operation. Its thermal resistance RθJA = 75 °C/W is specified with standard 0.31" × 0.31" copper pads per terminal, and the 6.5 W steady-state power dissipation (PD) is sufficient for typical leakage-current conditions. Heatsinking is unnecessary unless operating continuously near maximum junction temperature.
How does the SMC package of SM15T18CAHE3/57T compare to SMA in terms of surge handling?
The SMC (DO-214AB) package used in SM15T18CAHE3/57T offers larger thermal mass and lower thermal resistance (RθJA = 75 °C/W) than the smaller SMA (DO-214AC) package, enabling more effective heat dissipation during repetitive or high-duty-cycle transients. This makes SM15T18CAHE3/57T better suited for automotive applications where sustained thermal stress is expected.
SM15T18CAHE3/57T 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:
- 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)
SM15T18CAHE3/57T FAQ
1.How can I place an order for SM15T18CAHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T18CAHE3/57T 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 SM15T18CAHE3/57T reliable?
The price and inventory of SM15T18CAHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T18CAHE3/57T is usually 5 days.
3.What payment methods are accepted for SM15T18CAHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T18CAHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T18CAHE3/57T?
SM15T18CAHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T18CAHE3/57T 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 SM15T18CAHE3/57T?
For technical support, including SM15T18CAHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T18CAHE3/57T requirements.
6.How does Aetrix verify that SM15T18CAHE3/57T is sourced from the original manufacturer or authorized distributors?
All SM15T18CAHE3/57T 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 SM15T18CAHE3/57T meets industry standards.
7.What is the process for return or replacement of SM15T18CAHE3/57T?
All SM15T18CAHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SM15T18CAHE3/57T, 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 SM15T18CAHE3/57T part is unused and in its original packaging.
Return procedure for SM15T18CAHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T18CAHE3/57T Tags
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