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Vishay General Semiconductor - Diodes Division SM15T18CA-E3/57T
- Part No.:
- SM15T18CA-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T18CA-E3/57T.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,208
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Product details
Overview
SM15T18CA-E3/57T from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 18 V standoff voltage (VWM), 25.2 V clamping voltage at 59.5 A peak pulse current, and operating from −65 °C to +150 °C. It protects signal lines in automotive sensor units against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T18CA-E3/57T datasheet, SM15T18CA-E3/57T pinout, SM15T18CA-E3/57T application, or SM15T18CA-E3/57T equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (25.2 V / 18 V = 1.4), RoHS-compliant matte tin terminals, MSL Level 1 reflow compatibility, and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
The SM15T18CA-E3/57T implements a glass-passivated silicon junction optimized for high-energy transient suppression with low dynamic impedance. Its bidirectional architecture enables symmetrical clamping in both polarities without external polarity management.
Designed for surface-mount placement on 8.0 mm × 8.0 mm copper pads, it delivers 1500 W peak pulse power under IEC 61000-4-5 threat conditions while maintaining thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), enabling reliable operation in thermally constrained automotive and industrial PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 12 V automotive systems. |
| VBR min/max | 17.1 V / 18.9 V at 1 mA - Confirmed breakdown threshold ensures predictable turn-on within ±5.5% tolerance. |
| VC @ IPPM | 25.2 V at 59.5 A (10/1000 μs) - Clamping voltage limits downstream IC stress during surge events. |
| PPPM | 1500 W - Peak pulse power rating validates suitability for lightning surge protection per IEC 61000-4-5 Level 3/4. |
| TJ max | +150 °C - Enables deployment in under-hood automotive environments without derating below ambient. |
| RθJA | 75 °C/W - Thermal resistance measured on standard 8 mm × 8 mm pads; informs heatsinking requirements for sustained surge duty. |
Pinout & Package
Package: SMC (DO-214AB), molded epoxy case meeting UL 94 V-0 flammability rating; matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards; no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (unmarked) | Transient conduction path (bidirectional) | Both terminals function identically; no cathode/anode distinction-enables symmetric placement across differential or AC-coupled lines. |
| Anode (unmarked) | Transient conduction path (bidirectional) | Same electrical behavior as cathode terminal; eliminates orientation constraints during automated placement. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signal paths, RS-485 buses, or ungrounded sensor interfaces without polarity awareness. |
| 1500 W peak pulse power (10/1000 μs) | Validates robustness against lightning surges up to 10 A (line-to-ground) and 5 A (line-to-line) per IEC 61000-4-5. |
| Low clamping ratio (1.4) | Minimizes overvoltage stress on protected ICs-e.g., keeps 3.3 V or 5 V logic inputs below 25.2 V during worst-case transients. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without pre-baking; reduces manufacturing complexity and cost. |
| AEC-Q101 qualification option | HE3/HM3 variants meet automotive reliability requirements for engine control, ADAS sensors, and body electronics. |
Applications
| Automotive Sensor Protection | Industrial Motor Drive I/O |
|---|---|
Use Scenario: Protecting CAN bus transceivers and analog sensor outputs (e.g., pressure, temperature) in engine control modules exposed to load-dump and inductive kickback. IC Role / Device Role / Timing Role: Bidirectional TVS clamp limiting transient voltages to ≤25.2 V during 10/1000 μs surges up to 59.5 A. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V microcontrollers and analog front-ends without adding series impedance. |
Use Scenario: Shielding PLC digital input channels connected to 24 V DC field devices subject to relay coil switching transients. IC Role / Device Role / Timing Role: Fast-response voltage clamp absorbing >1 kV spikes with <1 ns response time and minimal capacitance (<100 pF). Use Value: Eliminates need for external RC snubbers or optocouplers-reducing BOM count and board space in DIN-rail mounted controllers. |
| Telecom Line Interface | Consumer USB Port ESD |
Use Scenario: Safeguarding Ethernet PHYs and PoE injectors against induced surges on outdoor cabling per IEEE 802.3af/bt. IC Role / Device Role / Timing Role: High-power bidirectional clamp handling common-mode transients up to 1500 W without degradation over 1000+ events. Use Value: Extends field-replaceable unit lifetime in outdoor access points by preventing cumulative degradation of PHY ESD structures. |
Use Scenario: Secondary-level protection on USB 2.0 data lines (D+/D−) in smart home hubs where primary ESD diodes lack sufficient energy handling. IC Role / Device Role / Timing Role: Bulk transient absorber shunting >10 A surges away from sensitive USB transceivers during hot-plug events. Use Value: Maintains signal integrity (low CJ) while raising system-level IEC 61000-4-2 immunity from ±8 kV to ±15 kV contact discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18CA | Lower peak pulse power (400 W), same VWM/VC, SMA package (smaller footprint, higher RθJA = 110 °C/W) | Suitable only for lower-energy threats (e.g., ESD-only, not lightning); limited to consumer-grade non-automotive use. | Select SMAJ18CA only when board space is critical and surge threat level is restricted to IEC 61000-4-2 ESD, not IEC 61000-4-5 surges. |
| SMCJ18CA | Same 1500 W rating and SMC package, but higher VBR range (19.0–21.0 V) and tighter VC spec (27.7 V @ 54.2 A) | Better suited for 24 V systems requiring higher VWM margin; slightly higher clamping voltage reduces protection margin for 12 V rails. | Choose SMCJ18CA for 24 V industrial controls; retain SM15T18CA-E3/57T for 12 V automotive applications where 18 V VWM and 25.2 V VC provide optimal margin. |
Compared with SMAJ18CA and SMCJ18CA, the SM15T18CA-E3/57T offers the tightest VBR tolerance (±5.5%) and lowest clamping voltage (25.2 V) among 1500 W SMC bidirectional TVS diodes at 18 V, making it optimal for 12 V automotive signal line protection where voltage headroom is constrained.
Availability
SM15T18CA-E3/57T is available at Aetrix Electronics and suitable for automotive sensor protection, industrial motor drive I/O, and telecom line interface applications requiring stable component supply, RoHS compliance, and long-term lifecycle support.
Supply support for SM15T18CA-E3/57T 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, and transient protection devices with emphasis on reliability, power handling, and automotive qualification.
The SM15T Series is engineered specifically for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where failure modes must be controlled and clamping performance must remain stable over temperature and lifetime.
FAQ
What is the clamping voltage of the SM15T18CA-E3/57T at its rated peak pulse current?
The SM15T18CA-E3/57T has a maximum clamping voltage (VC) of 25.2 V when subjected to its rated peak pulse current (IPPM) of 59.5 A under the standard 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88380 and defines the upper voltage limit imposed on protected circuitry during surge events. The SM15T18CA-E3/57T maintains this clamping performance across its full operating temperature range.
Is the SM15T18CA-E3/57T suitable for automotive applications?
Yes-the SM15T18CA-E3/57T is RoHS-compliant and compatible with AEC-Q101 qualification when ordered with HE3 or HM3 suffixes (e.g., SM15T18CAHE3_A). While the -E3/57T variant itself is commercial grade, its construction-including glass-passivated junction, MSL Level 1 rating, and −65 °C to +150 °C operating range-meets foundational requirements for under-hood and cabin electronics. The SM15T18CA-E3/57T is widely deployed in automotive sensor modules and body control units.
Does the SM15T18CA-E3/57T have polarity markings?
No-the SM15T18CA-E3/57T is a bidirectional TVS diode and carries no polarity marking on its SMC (DO-214AB) package. Unlike unidirectional variants (e.g., SM15T18A), it features identical electrical behavior at both terminals, allowing unrestricted orientation during pick-and-place assembly. This eliminates risk of misplacement and simplifies layout for differential or AC-coupled signal lines protected by the SM15T18CA-E3/57T.
What is the thermal resistance of the SM15T18CA-E3/57T?
The SM15T18CA-E3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, and a junction-to-lead resistance (RθJL) of 15 °C/W. These values are specified in the Thermal Characteristics table of Vishay document 88380 and directly inform thermal design-e.g., confirming that at 6.5 W steady-state dissipation, junction temperature rise remains within safe limits for continuous operation. The SM15T18CA-E3/57T leverages these characteristics for reliable performance in sealed enclosures.
How does the SM15T18CA-E3/57T differ from unidirectional SM15T18A variants?
The SM15T18CA-E3/57T is bidirectional with symmetrical clamping in both polarities and no polarity marking, whereas the SM15T18A is unidirectional with a cathode band and forward conduction capability. Electrically, the SM15T18CA-E3/57T exhibits identical VWM, VBR, and VC specs but supports AC or floating signal protection without ground-reference constraints. This makes the SM15T18CA-E3/57T preferred for RS-485, CAN, and other balanced interfaces where the SM15T18A would require dual-device implementation.
SM15T18CA-E3/57T 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:
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SM15T18CA-E3/57T FAQ
1.How can I place an order for SM15T18CA-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T18CA-E3/57T 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 SM15T18CA-E3/57T reliable?
The price and inventory of SM15T18CA-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T18CA-E3/57T is usually 5 days.
3.What payment methods are accepted for SM15T18CA-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T18CA-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T18CA-E3/57T?
SM15T18CA-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T18CA-E3/57T 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 SM15T18CA-E3/57T?
For technical support, including SM15T18CA-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T18CA-E3/57T requirements.
6.How does Aetrix verify that SM15T18CA-E3/57T is sourced from the original manufacturer or authorized distributors?
All SM15T18CA-E3/57T 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 SM15T18CA-E3/57T meets industry standards.
7.What is the process for return or replacement of SM15T18CA-E3/57T?
All SM15T18CA-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SM15T18CA-E3/57T, 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 SM15T18CA-E3/57T part is unused and in its original packaging.
Return procedure for SM15T18CA-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T18CA-E3/57T Tags
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