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Vishay General Semiconductor - Diodes Division SM15T24CA-E3/9AT
- Part No.:
- SM15T24CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T24CA-E3/9AT.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,556
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Product details
Overview
SM15T24CA-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), 24 V standoff voltage (VWM), and clamping voltage of 33.2 V at 45 A peak pulse current. It protects signal lines and power rails in automotive sensor interfaces and industrial I/O modules against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T24CA-E3/9AT datasheet, SM15T24CA-E3/9AT pinout, SM15T24CA-E3/9AT application, or SM15T24CA-E3/9AT equivalent, key selection criteria include bidirectional clamping symmetry, low clamping ratio (1.38×VWM), AEC-Q101 qualification eligibility, and compatibility with automated SMT placement on 8 mm × 8 mm copper pads.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with breakdown voltage (VBR) specified at 27.4–30.2 V (min/max) under 1 mA test current. Its clamping behavior follows standardized 10/1000 μs waveform testing per REA definitions, delivering consistent voltage limiting up to 33.2 V at 45 A IPPM.
Thermal design relies on RθJA = 75 °C/W (typical, no heatsink) and RθJL = 15 °C/W, enabling operation from –65 °C to +150 °C junction temperature. The device features glass-passivated junction, low inductance, and meets J-STD-020 MSL Level 1 (260 °C peak reflow).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA |
| VBR (min/max) | 27.4 V / 30.2 V at 1 mA - ensures reliable turn-on above system operating voltage with margin |
| VC @ IPPM | 33.2 V at 45 A (10/1000 μs) - limits transient voltage to safe level for downstream 3.3 V/5 V ICs |
| PPPM | 1500 W - withstands high-energy lightning surges (IEC 61000-4-5 Level 4) without failure |
| IPPM | 45 A - peak surge current capability validated on standard 8 mm × 8 mm copper pad layout |
| TJ max | +150 °C - supports under-hood automotive and industrial environments with extended thermal margin |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile, RoHS-compliant matte tin-plated leads. Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H); cathode band omitted (bidirectional type).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive polarity) | Accepts surge current during positive half-cycle; symmetrical with Cathode terminal |
| Cathode | Transient current entry (negative polarity) | Accepts surge current during negative half-cycle; identical electrical role to Anode in bidirectional configuration |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 1500 W peak pulse power | Meets IEC 61000-4-5 surge immunity requirements for industrial and automotive applications |
| Low clamping ratio (1.38×VWM) | Minimizes overvoltage stress on protected ICs compared to higher-ratio TVS devices |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity handling |
| Glass-passivated junction | Ensures stable leakage performance and long-term reliability under thermal cycling |
Applications
| Automotive Sensor Interface | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load-dump and ESD events in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt transients before reaching signal conditioning circuitry. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V microcontrollers and ADCs by limiting voltage to ≤33.2 V during 45 A surges. | Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to inductive kickback from solenoids and contactors. IC Role / Device Role / Timing Role: Transient suppression on 24 V DC field wiring terminals to absorb switching spikes up to 1500 W. Use Value: Eliminates need for external snubbers while maintaining >100 kΩ input impedance at 24 V nominal operation. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Shielding Ethernet PHYs and RS-485 transceivers in networked building automation equipment from induced lightning surges. IC Role / Device Role / Timing Role: Primary-level protection on unshielded twisted-pair lines entering outdoor-rated enclosures. Use Value: Provides <1 ns response time and <33.2 V clamping to preserve signal integrity and meet IEC 61000-4-5 Class 3 compliance. | Use Scenario: Guarding microcontroller GPIOs and gate drivers in smart washing machine motor control boards against brush-commutator noise. IC Role / Device Role / Timing Role: Localized TVS on motor driver enable lines and feedback sensing paths. Use Value: Withstands repetitive 100 A surge currents (derated) without degradation, extending board lifetime in high-noise environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA | 600 W PPPM, same VWM/VC, SMB package (smaller footprint, lower thermal mass) | Limited to lower-energy threats (IEC 61000-4-5 Level 2); unsuitable for direct lightning coupling | Select when board space is constrained and surge threat level is defined below 1500 W. |
| SMCJ24CA | 1500 W PPPM, identical VWM/VC, same SMC package but non-AEC-Q101 commercial grade | No automotive qualification path; lacks whisker resistance certification per JESD 201 Class 2 | Choose for cost-sensitive industrial designs where AEC-Q101 is not mandated. |
Compared with SM15T24CA-E3/9AT, SMBJ24CA offers smaller size but reduced surge handling, while SMCJ24CA matches power rating but omits automotive qualification and enhanced plating-making SM15T24CA-E3/9AT the preferred choice for AEC-Q101-compliant automotive sensor nodes requiring full 1500 W immunity.
Availability
SM15T24CA-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor interface, industrial PLC I/O protection, and telecom line interface applications requiring stable component supply, traceable sourcing, and long-term lifecycle support.
Supply support for SM15T24CA-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, MOSFETs, and optoelectronics with emphasis on reliability and application-specific performance.
The SM15T Series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where robustness against lightning, ESD, and inductive switching is mission-critical.
FAQ
What is the clamping voltage of SM15T24CA-E3/9AT at its rated peak pulse current?
The SM15T24CA-E3/9AT has a maximum clamping voltage (VC) of 33.2 V when subjected to its rated peak pulse current (IPPM) of 45 A under the standard 10/1000 μs waveform. This value is measured with the device mounted on 8.0 mm × 8.0 mm copper pads per JEDEC guidelines and defines the upper voltage limit imposed on protected circuitry during surge events.
Is SM15T24CA-E3/9AT qualified for automotive applications?
SM15T24CA-E3/9AT itself is RoHS-compliant commercial-grade (E3 suffix); however, the SM15T24CAHE3 variant is AEC-Q101 qualified. The base SM15T24CA-E3/9AT shares identical electrical and thermal specifications but lacks formal automotive qualification documentation-designers requiring AEC-Q101 must specify the HE3 suffix version.
How does the bidirectional configuration of SM15T24CA-E3/9AT affect its PCB layout?
The SM15T24CA-E3/9AT has no polarity marking and functions identically in both directions, simplifying PCB layout by eliminating orientation constraints. Unlike unidirectional TVS diodes, it requires no attention to cathode/anode placement-reducing assembly errors and enabling flexible routing on differential or AC-coupled signal paths.
What is the thermal resistance of SM15T24CA-E3/9AT, and how does it impact power dissipation?
SM15T24CA-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W under standard SMT conditions (no heatsink). At ambient temperatures above 25 °C, its 6.5 W steady-state power dissipation derates linearly-requiring thermal analysis for continuous operation near TJ max (150 °C), especially in enclosed enclosures.
Can SM15T24CA-E3/9AT be used in place of a unidirectional TVS like SM15T24A-E3/9AT?
No-SM15T24CA-E3/9AT is strictly bidirectional and cannot replace unidirectional types in DC-biased circuits where reverse conduction must be blocked. In applications with defined polarity (e.g., 24 V supply rail), using SM15T24CA-E3/9AT would allow unintended reverse current flow during normal operation, risking system malfunction or damage.
SM15T24CA-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):
- 20.5V
- Voltage - Breakdown (Min):
- 22.8V
- Voltage - Clamping (Max) @ Ipp:
- 33.2V
- Current - Peak Pulse (10/1000µs):
- 45A
- 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)
SM15T24CA-E3/9AT FAQ
1.How can I place an order for SM15T24CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T24CA-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 SM15T24CA-E3/9AT reliable?
The price and inventory of SM15T24CA-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 SM15T24CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T24CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T24CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T24CA-E3/9AT?
SM15T24CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T24CA-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 SM15T24CA-E3/9AT?
For technical support, including SM15T24CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T24CA-E3/9AT requirements.
6.How does Aetrix verify that SM15T24CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T24CA-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 SM15T24CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T24CA-E3/9AT?
All SM15T24CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T24CA-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 SM15T24CA-E3/9AT part is unused and in its original packaging.
Return procedure for SM15T24CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T24CA-E3/9AT Tags
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