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Vishay General Semiconductor - Diodes Division SM15T18CA-M3/57T
- Part No.:
- SM15T18CA-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T18CA-M3/57T.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,607
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Product details
Overview
SM15T18CA-M3/57T 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 SM15T18CA-M3/57T datasheet, SM15T18CA-M3/57T pinout, SM15T18CA-M3/57T application, or SM15T18CA-M3/57T equivalent, key selection criteria include bidirectional clamping capability, 1500 W surge rating, SMC package thermal performance (RθJA = 75 °C/W), AEC-Q101 qualification eligibility, and halogen-free RoHS compliance per M3 suffix.
Technical Context
This bidirectional TVS diode operates symmetrically across both polarities with identical breakdown (VBR = 17.1–18.9 V at 1 mA), clamping (VC = 25.2 V @ IPPM = 59.5 A), and leakage (<1 μA @ 15.3 V) characteristics in forward and reverse directions. Its glass-passivated junction ensures stable avalanche behavior under repetitive transient stress.
The device is designed for high-impedance source environments where system-level source impedance limits surge current within its 59.5 A IPPM rating. Failure mode under overstress is a short circuit, consistent with industrial and automotive safety requirements for fail-safe protection elements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.3 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected line DC bias. |
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - Confirmed breakdown threshold range; defines onset of clamping action in both directions. |
| VC @ IPPM | 25.2 V at 59.5 A (10/1000 μs) - Clamped voltage during worst-case surge; determines maximum stress on downstream ICs. |
| PPPM | 1500 W - Peak transient power handling capacity; validates suitability for lightning and motor-switching threats. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and industrial enclosures. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; supports automated placement. |
| Compliance | Halogen-free, RoHS-compliant (M3 suffix); meets JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1. |
Pinout & Package
SM15T18CA-M3/57T uses the SMC (DO-214AB) package - a molded, surface-mount case with two coplanar matte tin-plated terminals. No polarity marking is present on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point in negative half-cycle | Accepts surge current during negative polarity transients; symmetrical with cathode for bidirectional conduction. |
| Cathode | Transient current entry point in positive half-cycle | Accepts surge current during positive polarity transients; functionally identical to anode due to bidirectional design. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates need for polarity-aware layout in AC-coupled or differential signal lines. |
| 1500 W peak pulse power | Validated with 10/1000 μs waveform - meets IEC 61000-4-5 Level 4 surge immunity requirements for industrial and automotive ports. |
| Low clamping ratio (VC/VWM = 1.65) | 25.2 V clamp at 15.3 V standoff - minimizes overvoltage stress on 16–24 V rail systems without requiring derating headroom. |
| MSL Level 1 rating | Peak reflow temperature up to 260 °C - enables single-pass lead-free assembly without moisture sensitivity concerns. |
| AEC-Q101 qualification path | M3 suffix indicates halogen-free, RoHS-compliant construction compatible with automotive-grade screening when ordered as HM3 variant. |
Applications
| Automotive Sensor Protection | Industrial I/O Port Protection |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor outputs (e.g., pressure, temperature) in engine control modules from load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector interface to shunt transients before reaching signal conditioning ICs. Use Value: 25.2 V clamping ensures microcontrollers and ADCs operating at 3.3 V or 5 V logic remain undamaged during 12 V/24 V system surges. |
Use Scenario: Safeguarding PLC digital input channels connected to external field devices subject to inductive kickback from solenoids or relays. IC Role / Device Role / Timing Role: Primary transient suppression element on 24 V DC input lines, mounted adjacent to terminal block. Use Value: 1500 W rating handles repeated 500 A/2 Ω surge events per IEC 61000-4-4, extending maintenance intervals and reducing field failures. |
| Telecom Line Interface | Consumer Power Adapter ESD Protection |
Use Scenario: Shielding Ethernet PHY or RS-485 transceivers in base station equipment from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-stage protector before gas discharge tube (GDT) or secondary TVS, absorbing fast-rising energy. Use Value: Low inductance and 25.2 V clamp prevent overshoot beyond transceiver absolute maximum ratings during 1.2/50 μs transients. |
Use Scenario: Adding robustness to USB-C or barrel-jack inputs in smart home hubs against user-handling ESD and accidental AC mains contact. IC Role / Device Role / Timing Role: Secondary protection device after primary fuse or PTC, clamping residual overvoltage after upstream limiting. Use Value: Halogen-free M3 construction satisfies IEC 62368-1 material requirements while maintaining 15.3 V working voltage for 19 V adapter rails. |
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 power (600 W), same VWM (15.3 V), SMB package (smaller footprint, higher RθJA = 85 °C/W) | Limited to lower-energy threats (IEC 61000-4-2 ESD only); unsuitable for lightning or motor-switching surges. | Select SMBJ18CA only when board space is constrained and threat level is limited to ±8 kV contact ESD. |
| SMCJ18CA | Same 1500 W rating and SMC package, but E3 suffix (non-halogen-free); identical electrical specs and thermal resistance. | No functional difference in protection performance; differs only in material compliance (RoHS without halogen-free certification). | Choose SMCJ18CA if halogen-free requirement is not mandated by end-equipment standards or OEM specifications. |
Compared with SM15T18CA-M3/57T, SMBJ18CA offers reduced surge margin and thermal derating headroom, while SMCJ18CA matches all electrical and mechanical performance but lacks halogen-free documentation - making SM15T18CA-M3/57T the optimal choice for automotive and green-electronics programs requiring full material compliance.
Availability
SM15T18CA-M3/57T is available at Aetrix Electronics and suitable for automotive sensor units, industrial PLC I/O modules, telecom line interfaces, and consumer power adapter designs requiring stable component supply and halogen-free compliance.
Supply support for SM15T18CA-M3/57T 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 reliability, power efficiency, and automotive-grade qualification.
The SM15T Series was developed specifically for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where 1500 W surge capability and AEC-Q101 readiness are mandatory.
FAQ
What does the "CA" suffix indicate in SM15T18CA-M3/57T?
The "CA" suffix denotes a bidirectional configuration, meaning SM15T18CA-M3/57T provides symmetrical transient suppression in both polarities - unlike unidirectional "A" variants that require correct orientation. This eliminates polarity-checking during assembly and simplifies protection of AC-coupled or differential signals.
Is SM15T18CA-M3/57T qualified to AEC-Q101?
SM15T18CA-M3/57T itself is not AEC-Q101 qualified; however, the SM15T platform supports AEC-Q101 via the HM3 suffix (e.g., SM15T18CAHM3_A/H). The M3 suffix confirms halogen-free, RoHS-compliant construction - a prerequisite for automotive qualification but not sufficient alone.
What is the maximum clamping voltage of SM15T18CA-M3/57T under surge conditions?
The maximum clamping voltage of SM15T18CA-M3/57T is 25.2 V when subjected to a 10/1000 μs waveform at its peak pulse current of 59.5 A. This value is measured across both terminals during transient conduction and defines the upper voltage limit imposed on protected circuitry.
Can SM15T18CA-M3/57T be used in place of a unidirectional TVS like SM15T18A-M3/57T?
SM15T18CA-M3/57T can replace SM15T18A-M3/57T only in circuits where bidirectional protection is acceptable and polarity-insensitive layout is feasible. It must not be substituted in unidirectionally biased rails (e.g., DC power inputs with series diodes) without verifying reverse leakage and failure-mode compatibility.
What is the thermal resistance junction-to-ambient for SM15T18CA-M3/57T?
The typical thermal resistance junction-to-ambient (RθJA) for SM15T18CA-M3/57T is 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes standard PCB layout per Vishay's recommended pad dimensions and is critical for calculating safe power dissipation at elevated ambient temperatures.
SM15T18CA-M3/57T 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-M3/57T FAQ
1.How can I place an order for SM15T18CA-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T18CA-M3/57T 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-M3/57T reliable?
The price and inventory of SM15T18CA-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T18CA-M3/57T is usually 5 days.
3.What payment methods are accepted for SM15T18CA-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T18CA-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T18CA-M3/57T?
SM15T18CA-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T18CA-M3/57T 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-M3/57T?
For technical support, including SM15T18CA-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T18CA-M3/57T requirements.
6.How does Aetrix verify that SM15T18CA-M3/57T is sourced from the original manufacturer or authorized distributors?
All SM15T18CA-M3/57T 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-M3/57T meets industry standards.
7.What is the process for return or replacement of SM15T18CA-M3/57T?
All SM15T18CA-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SM15T18CA-M3/57T, 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-M3/57T part is unused and in its original packaging.
Return procedure for SM15T18CA-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T18CA-M3/57T Tags
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