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Vishay General Semiconductor - Diodes Division SM15T24CA-M3/9AT
- Part No.:
- SM15T24CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T24CA-M3/9AT.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,984
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Product details
Overview
SM15T24CA-M3/9AT 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 switching transients.
For engineers reviewing the SM15T24CA-M3/9AT datasheet, SM15T24CA-M3/9AT pinout, SM15T24CA-M3/9AT application, or SM15T24CA-M3/9AT equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, thermal resistance (RθJA = 75 °C/W), AEC-Q101 qualification status, and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker testing.
Technical Context
The SM15T24CA-M3/9AT operates as a bidirectional voltage-clamping device with symmetrical breakdown characteristics in both polarities, enabling protection of AC-coupled or floating signal paths without polarity concerns. Its glass-passivated junction ensures stable leakage performance and low capacitance under reverse bias.
Designed for high-energy transient suppression, it sustains 1500 W peak pulse power per 10/1000 μs waveform while maintaining clamping voltage ≤33.2 V at 45 A, with thermal resistance to ambient of 75 °C/W on standard 8.0 mm × 8.0 mm copper pads. It meets MSL Level 1 and supports reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuit. |
| VBR (min/max) | 22.8 V / 25.2 V - Breakdown occurs within this band at 1 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | 33.2 V @ 45 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 1500 W - Peak pulse power handling capability; enables robust protection against lightning and inductive switching events. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on recommended pad layout; informs derating above 25 °C ambient. |
| TJ max | +150 °C - Maximum junction temperature; sets upper limit for thermal design margin in sealed enclosures. |
| Package | SMC (DO-214AB) - Surface-mount package with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated placement. |
Pinout & Package
SMC (DO-214AB) package with two terminals: no polarity marking for bidirectional operation. Cathode/anode designation does not apply; both terminals are functionally identical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Transient return path | Connects to ground or common reference plane; carries full surge current during clamping event. |
| Terminal 2 | Protected line interface | Connects to signal or power line requiring protection; forms symmetrical clamp with Terminal 1. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC, differential, or floating nodes without external polarity management. |
| 1500 W peak pulse rating | Supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out with low-inductance grounding. |
| Halogen-free & RoHS-compliant (M3) | Fulfills environmental compliance requirements for automotive and industrial end equipment without compromising reliability. |
| AEC-Q101 qualified option available | HM3 variant meets automotive-grade reliability standards; SM15T24CA-M3/9AT is commercial-grade but shares same die and process. |
| Low clamping ratio (VC/VWM = 1.38) | Minimizes overvoltage exposure to protected ICs compared to higher-ratio TVS devices. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load-dump and ESD events in engine control units. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across signal pair or between signal and chassis ground. Use Value: Limits transient voltage to ≤33.2 V, preventing latch-up or gate oxide damage in 5 V/3.3 V interface ICs. | Use Scenario: Shielding PLC digital input modules from inductive kickback generated by solenoid and relay coils in factory automation systems. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor on 24 V DC input lines upstream of optocoupler isolation stage. Use Value: Absorbs 1500 W surges without degradation, preserving long-term reliability of isolation barrier components. |
| Telecom Line Protection | Consumer Power Adapter Input |
Use Scenario: Safeguarding Ethernet PHY front-end circuits and PoE injectors against lightning-induced surges entering via RJ45 ports. IC Role / Device Role / Timing Role: Common-mode clamp across differential pairs with shared ground reference. Use Value: Symmetrical clamping ensures balanced suppression on both conductors, maintaining signal integrity during surge events. | Use Scenario: Secondary-side overvoltage protection in USB-C PD adapters where 24 V auxiliary rails feed controller ICs. IC Role / Device Role / Timing Role: Standoff-rated clamp on 24 V output rail to prevent regulator failure during output short-circuit recovery. Use Value: Fast response (<1 ps) and low leakage (<1 μA at 24 V) avoid standby power loss while ensuring fail-safe shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24CA | 600 W peak power, SMA package, higher RθJA (110 °C/W), same VWM/VC ratings | Limited to lower-energy threats; unsuitable for IEC 61000-4-5 Level 4 compliance | Select when board space is constrained and surge threat level is ≤1 kV. |
| SMCJ24CA | 1500 W rating, identical SMC package, tighter VBR tolerance (5% vs. 10%), same thermal specs | Higher cost; preferred for designs requiring tighter parametric consistency across production lots | Choose when VBR distribution control is critical for margin analysis in safety-critical systems. |
Compared with SMAJ24CA and SMCJ24CA, the SM15T24CA-M3/9AT offers optimal balance of surge robustness, thermal performance, and commercial-grade cost-making it ideal for high-volume industrial and automotive-tier-2 applications where AEC-Q101 is not mandated but reliability must exceed basic consumer requirements.
Availability
SM15T24CA-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface boards requiring stable component supply and halogen-free compliance.
Supply support for SM15T24CA-M3/9AT 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, MOSFETs, and protection devices with emphasis on high-reliability, high-power, and automotive-qualified solutions.
The SM15T Series was engineered for robust transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where 1500 W surge immunity, low clamping voltage, and AEC-Q101 readiness are essential system-level requirements.
FAQ
What is the clamping voltage of SM15T24CA-M3/9AT at its rated peak pulse current?
The SM15T24CA-M3/9AT has a maximum clamping voltage (VC) of 33.2 V at 45 A peak pulse current (IPPM) 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 worst-case surge events. The SM15T24CA-M3/9AT maintains this clamping performance across its full operating temperature range.
Is SM15T24CA-M3/9AT suitable for automotive applications requiring AEC-Q101 qualification?
The SM15T24CA-M3/9AT itself is a commercial-grade part with halogen-free RoHS compliance (M3 suffix), but it is not AEC-Q101 qualified. For automotive use, Vishay offers the HM3 variant (e.g., SM15T24CAHM3_A/I), which shares the same die and SMC package but undergoes additional stress testing per AEC-Q101. The SM15T24CA-M3/9AT may be used in non-safety-critical automotive subsystems where qualification is not mandated.
What is the thermal resistance of SM15T24CA-M3/9AT, and how does it affect PCB layout?
The SM15T24CA-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's DO-214AB outline. To maintain safe junction temperatures under repeated surges, designers must ensure adequate copper area and avoid thermal bottlenecks-undersized traces will increase effective RθJA and risk thermal runaway. The SM15T24CA-M3/9AT benefits from symmetric thermal coupling to both terminals.
How does the bidirectional configuration of SM15T24CA-M3/9AT differ from unidirectional TVS diodes like SM15T24A?
The SM15T24CA-M3/9AT provides symmetrical clamping in both directions, making it suitable for protecting AC signals, differential buses (e.g., RS-485), or floating nodes where polarity is undefined. In contrast, SM15T24A is unidirectional and requires correct cathode orientation relative to ground. Both share identical VWM, VBR, and VC magnitudes, but only the SM15T24CA-M3/9AT eliminates polarity-dependent layout constraints and supports common-mode surge suppression.
What packaging format is used for SM15T24CA-M3/9AT, and what is its reel quantity?
The SM15T24CA-M3/9AT is supplied in 13-inch diameter plastic tape and reel format (package code 9AT) with a base quantity of 3500 units per reel. This format supports high-speed automated pick-and-place assembly and complies with EIA-481 standards. The "M3" suffix confirms halogen-free, RoHS-compliant construction with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. The SM15T24CA-M3/9AT reel is compatible with standard SMC feeders.
SM15T24CA-M3/9AT 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-M3/9AT FAQ
1.How can I place an order for SM15T24CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T24CA-M3/9AT 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-M3/9AT reliable?
The price and inventory of SM15T24CA-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T24CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T24CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T24CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T24CA-M3/9AT?
SM15T24CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T24CA-M3/9AT 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-M3/9AT?
For technical support, including SM15T24CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T24CA-M3/9AT requirements.
6.How does Aetrix verify that SM15T24CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T24CA-M3/9AT 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-M3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T24CA-M3/9AT?
All SM15T24CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T24CA-M3/9AT, 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-M3/9AT part is unused and in its original packaging.
Return procedure for SM15T24CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T24CA-M3/9AT Tags
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