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Vishay General Semiconductor - Diodes Division SM15T18CA-E3/9AT
- Part No.:
- SM15T18CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T18CA-E3/9AT.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,269
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Product details
Overview
SM15T18CA-E3/9AT 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), 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 switching transients.
For engineers reviewing the SM15T18CA-E3/9AT datasheet, SM15T18CA-E3/9AT pinout, SM15T18CA-E3/9AT application, or SM15T18CA-E3/9AT equivalent, key selection criteria include bidirectional clamping behavior, 18 V VWM, 25.2 V VC at 59.5 A, RoHS-compliant matte tin terminals, and AEC-Q101 qualification eligibility via HE3/HM3 variants.
Technical Context
This bidirectional TVS operates symmetrically across both polarities with identical breakdown (VBR = 17.1–18.9 V at 1 mA), clamping (VC = 25.2 V at IPPM = 59.5 A), and leakage (<1.0 μA at VWM = 18 V) characteristics in forward and reverse directions. Its low-inductance SMC package enables fast response to sub-microsecond transients.
The device uses a glass-passivated silicon junction and is rated for TJ = –65 °C to +150 °C operation. Thermal resistance is RθJA = 75 °C/W (typ.) on 8.0 mm × 8.0 mm copper pads, supporting reliable surge handling without external heatsinking in typical PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 18 V - Maximum continuous reverse voltage before clamping begins; sets operating margin above circuit nominal voltage. |
| VBR (Breakdown Voltage) | 17.1–18.9 V at 1 mA - Confirmed symmetric breakdown threshold in both directions; ensures predictable turn-on. |
| VC (Clamping Voltage) | 25.2 V at 59.5 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; defines protection window. |
| PPPM (Peak Pulse Power) | 1500 W - Sustains high-energy transients like lightning surges (IEC 61000-4-5) without failure. |
| IPPM (Peak Pulse Current) | 59.5 A - Maximum non-repetitive surge current the device can divert while maintaining VC ≤ 25.2 V. |
| TJ max. | +150 °C - Enables use in under-hood automotive and high-ambient industrial environments. |
| Package | SMC (DO-214AB) - Surface-mount, low-profile package compatible with automated placement and reflow soldering per J-STD-020 MSL level 1. |
Pinout & Package
SM15T18CA-E3/9AT is housed in an SMC (DO-214AB) plastic package with two unmarked terminals - no polarity marking as required for bidirectional devices. The case conforms to UL 94 V-0 flammability rating and features matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional conduction path | Both terminals function identically; no cathode band marking; enables placement without orientation check. |
| Case (plastic body) | Isolation barrier | Non-conductive housing provides electrical isolation and mechanical protection; no thermal or electrical connection to die. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 4 (4 kV) surge immunity in systems with moderate source impedance. |
| Low clamping ratio (VC/VWM ≈ 1.4) | Minimizes overvoltage stress on downstream ICs while maintaining margin against false triggering. |
| Glass-passivated junction | Ensures stable VBR and low leakage over temperature and lifetime; improves reliability in harsh environments. |
| MSL Level 1, 260 °C peak reflow | Compatible with standard lead-free SMT assembly processes without moisture sensitivity concerns. |
| AEC-Q101 qualification path | Enables drop-in use in automotive applications when ordered as SM15T18CAHE3_A/I (HE3 suffix). |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) in engine control modules against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt surge energy before it reaches signal conditioning circuitry. Use Value: Maintains signal integrity by limiting transient overvoltage to ≤25.2 V while surviving repeated 59.5 A pulses - critical for ASIL-B compliant subsystems. | Use Scenario: Safeguarding digital input/output channels of programmable logic controllers against ESD and 2 kV/1 kA surges induced by relay coil switching or field wiring faults. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on terminal blocks and backplane connectors, operating in parallel with gas discharge tubes or MOVs in hybrid protection schemes. Use Value: Fast response (<1 ns) and low clamping voltage prevent latch-up or damage to 3.3 V/5 V microcontrollers and optocouplers driving isolated outputs. |
| Telecom Line Interface Protection | Consumer Appliance Motor Control |
Use Scenario: Shielding Ethernet PHYs, DSL line drivers, and PoE injectors from induced surges on outdoor cabling exposed to lightning coupling. IC Role / Device Role / Timing Role: Secondary-level protector downstream of primary GDT-based protection, providing precise low-voltage clamping for sensitive silicon. Use Value: 18 V VWM aligns with 12 V bias rails in telecom line cards; 25.2 V VC stays below absolute maximum ratings of common PHY ICs. | Use Scenario: Securing MCU GPIOs and gate drivers controlling BLDC motors in washing machines and HVAC blowers against commutation spikes. IC Role / Device Role / Timing Role: Localized clamp on motor driver enable lines and feedback sensing paths to prevent false resets or erroneous fault detection. Use Value: Bidirectional symmetry eliminates need for orientation-aware layout; RoHS-compliant E3 termination supports global appliance compliance requirements. |
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 power (400 W), same VWM/VC, SMA package (smaller footprint, higher RθJA) | Not suitable for IEC 61000-4-5 Level 4; limited to lower-energy threats (e.g., ESD, local switching noise) | Select SMAJ18CA only if system-level surge testing is ≤1 kV and board space is constrained. |
| SMCJ18CA | Same 1500 W rating and SMC package, but tighter VBR tolerance (17.1–18.9 V vs. 17.1–19.0 V) and slightly higher VC (26.5 V at 56.5 A) | Identical application scope; minor derating needed for margin-critical 24 V rail protection | SMCJ18CA is a direct functional alternative with near-identical performance; verify layout compatibility with exact pad dimensions. |
Compared with SMAJ18CA and SMCJ18CA, SM15T18CA-E3/9AT offers identical 1500 W surge capability and SMC packaging as SMCJ18CA but with tighter VC (25.2 V), making it preferable for protecting 18–24 V systems where voltage margin is critical; unlike SMAJ18CA, it avoids power derating in high-temperature environments due to superior thermal design.
Availability
SM15T18CA-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor units, industrial PLC I/O modules, and telecom line interface designs requiring stable component supply, RoHS compliance, and long-term production continuity.
Supply support for SM15T18CA-E3/9AT 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, TVS devices, and MOSFETs for high-reliability power and protection applications.
The SM15T Series was developed to deliver high-power transient suppression in compact SMC packages for automotive, industrial, and telecom systems demanding AEC-Q101 readiness and robust 10/1000 μs surge handling - with SM15T18CA-E3/9AT targeting 18 V rail protection.
FAQ
What does the "CA" suffix indicate in SM15T18CA-E3/9AT?
The "CA" suffix denotes a bidirectional configuration - meaning SM15T18CA-E3/9AT provides symmetrical clamping in both forward and reverse directions, with identical VBR, VC, and leakage characteristics across polarity. This eliminates orientation constraints during PCB assembly and suits AC-coupled or differential signal lines where voltage reversals occur.
Is SM15T18CA-E3/9AT qualified to AEC-Q101?
SM15T18CA-E3/9AT itself is RoHS-compliant commercial-grade; however, the same die and construction are AEC-Q101 qualified when ordered with HE3 or HM3 suffixes (e.g., SM15T18CAHE3_A/I). The E3/9AT variant shares all electrical and thermal specs but lacks the automotive qualification documentation and screening.
What is the maximum clamping voltage of SM15T18CA-E3/9AT under surge conditions?
The maximum clamping voltage of SM15T18CA-E3/9AT is 25.2 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 59.5 A. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events.
Can SM15T18CA-E3/9AT be used in place of a unidirectional TVS like SM15T18A-E3/9AT?
No - SM15T18CA-E3/9AT is bidirectional and has no polarity marking, whereas SM15T18A-E3/9AT is unidirectional with a cathode band. Substituting them requires verifying that the circuit does not rely on DC blocking or asymmetric conduction; reverse-bias leakage and forward conduction behavior differ significantly between the two types.
What PCB pad layout is recommended for optimal thermal and surge performance of SM15T18CA-E3/9AT?
Vishay specifies mounting SM15T18CA-E3/9AT on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve the rated 1500 W peak pulse power and thermal resistance of 75 °C/W. Smaller pads reduce surge capability and increase junction temperature during repetitive transients.
SM15T18CA-E3/9AT 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-E3/9AT FAQ
1.How can I place an order for SM15T18CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T18CA-E3/9AT 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 SM15T18CA-E3/9AT reliable?
The price and inventory of SM15T18CA-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T18CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T18CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T18CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T18CA-E3/9AT?
SM15T18CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T18CA-E3/9AT 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 SM15T18CA-E3/9AT?
For technical support, including SM15T18CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T18CA-E3/9AT requirements.
6.How does Aetrix verify that SM15T18CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T18CA-E3/9AT 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 SM15T18CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T18CA-E3/9AT?
All SM15T18CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T18CA-E3/9AT, 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 SM15T18CA-E3/9AT part is unused and in its original packaging.
Return procedure for SM15T18CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T18CA-E3/9AT Tags
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