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Vishay General Semiconductor - Diodes Division SM15T24A-M3/9AT
- Part No.:
- SM15T24A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T24A-M3/9AT.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,559
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Product details
Overview
SM15T24A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, with 24 V standoff voltage (VWM = 20.5 V), 25.2 V minimum breakdown voltage (VBR), 33.2 V maximum clamping voltage at 45 A IPPM, and 1500 W peak pulse power rating per 10/1000 μs waveform. It protects MOSFETs and signal lines in automotive sensor units against inductive switching transients.
For engineers reviewing the SM15T24A-M3/9AT datasheet, SM15T24A-M3/9AT pinout, SM15T24A-M3/9AT application, or SM15T24A-M3/9AT equivalent, this page delivers verified electrical parameters, thermal resistance (RθJA = 75 °C/W), polarity marking (cathode band), halogen-free RoHS compliance (M3 suffix), and AEC-Q101 qualification path - all critical for automotive-grade transient protection design-in.
Technical Context
This unidirectional TVS diode operates with a glass-passivated junction and low-inductance SMC package to minimize voltage overshoot during fast transients. Its clamping behavior is defined by a 10/1000 μs waveform, and it sustains up to 200 A non-repetitive forward surge current (IFSM) for 10 ms half-sine pulses.
The device features a maximum junction temperature of 150 °C, thermal resistance of 75 °C/W (junction-to-ambient), and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its reverse leakage is limited to 1.0 μA at 20.5 V VWM, ensuring minimal standby power loss in protected circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20.5 V - Maximum continuous reverse operating voltage before clamping begins; sets operating margin below breakdown. |
| VBR (Breakdown Voltage) | 22.8–25.2 V at 1.0 mA IT - Confirmed avalanche initiation range; ensures predictable turn-on under transient stress. |
| VC (Clamping Voltage) | 33.2 V at 45 A IPPM (10/1000 μs) - Limits voltage seen by downstream ICs during surge; enables safe operation of 24 V rail components. |
| PPPM (Peak Pulse Power) | 1500 W - Withstands lightning-induced or motor-switching transients without failure; validated on 8.0 mm × 8.0 mm copper pads. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance under standard mounting; informs heatsinking requirements for sustained power dissipation. |
| IFSM | 200 A - Peak forward surge current rating for 10 ms half-sine wave; supports robustness against accidental polarity reversal events. |
| Polarity | Unidirectional with cathode band marking - Enables correct orientation in DC-biased protection paths; prevents misplacement in layout. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant (M3 suffix), matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by molded band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to lower-potential side of protected line | Completes conduction path during overvoltage events; must be routed to ground or return path with minimal inductance. |
| Cathode | Current exit terminal in forward bias; marked with band; connected to higher-potential side (e.g., 24 V rail) | Defines polarity-sensitive placement; incorrect orientation disables clamping function and risks open-circuit failure mode. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables protection against high-energy transients from industrial motor switching or ISO 7637-2 pulse 5a without derating. |
| Glass passivated chip junction | Ensures stable breakdown characteristics and long-term reliability under thermal cycling and humidity exposure. |
| Low inductance SMC package | Minimizes voltage overshoot during nanosecond-scale transients; critical for protecting fast-switching MOSFET gates. |
| AEC-Q101 qualification path (HM3 variant) | Supports automotive qualification via HM3 suffix; confirms robustness for engine control, ADAS sensor, and body electronics. |
| MSL Level 1 (260 °C peak) | Allows single-reflow assembly without moisture sensitivity concerns; eliminates bake requirement in production. |
Applications
| Automotive Sensor Protection | Industrial Motor Drive I/O |
|---|---|
Use Scenario: Protecting LIN bus transceivers and Hall-effect sensors in 24 V vehicle subsystems exposed to load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor supply rail and ground to clamp transients before they reach sensitive analog front-ends. Use Value: Clamps to ≤33.2 V during 45 A surges, preserving 24 V-rated ICs and meeting ISO 16750-2 test requirements. |
Use Scenario: Safeguarding PLC digital input modules connected to solenoid valves and contactors subject to coil de-energization spikes. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24 V input lines to absorb repetitive 10/1000 μs transients up to 1500 W without degradation. Use Value: Maintains <1.0 μA leakage at 20.5 V, preventing false triggering while delivering consistent clamping across >10⁵ surge events. |
| Telecom Power Interface | Computer Peripheral Port |
Use Scenario: Shielding PoE-powered remote radio units from induced surges on 24–48 V DC feeds entering outdoor enclosures. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC input stage, coordinated with upstream fuse and downstream DC-DC converter. Use Value: 75 °C/W RθJA allows operation at full power in sealed housings up to +85 °C ambient without thermal runaway. |
Use Scenario: Securing USB-C PD negotiation lines and auxiliary power rails in docking stations handling hot-plug events and cable ESD. IC Role / Device Role / Timing Role: Fast-response unidirectional suppressor on 20 V auxiliary rails to prevent latch-up in USB PD controllers. Use Value: 33.2 V clamping ensures VDD pins remain within absolute maximum ratings even during 1 kV EFT bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Lower PPPM (400 W), same VWM (20.5 V), larger package (SMA/DO-214AC), RθJA = 110 °C/W | Not suitable for 1500 W threats like ISO 7637-2 pulse 5a; limited to low-energy ESD and EFT. | Select SMAJ24A only for cost-sensitive consumer applications where surge energy is strictly bounded below 400 W. |
| SMCJ24A | Same PPPM (1500 W), identical SMC package, but E3 suffix (non-halogen-free); VBR min = 22.8 V, VC = 33.2 V - electrically identical | RoHS-compliant but not halogen-free; lacks M3 environmental designation required for some automotive OEMs. | Choose SMCJ24A when halogen-free content is not mandated; otherwise SM15T24A-M3/9AT satisfies both AEC-Q101 readiness and green procurement policies. |
Compared with SMAJ24A and SMCJ24A, SM15T24A-M3/9AT uniquely combines 1500 W surge capability, halogen-free construction, MSL Level 1 reflow compatibility, and documented AEC-Q101 qualification path - making it the preferred choice for automotive and industrial designs requiring full compliance traceability.
Availability
SM15T24A-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor units, industrial motor drive I/O interfaces, and telecom power interfaces requiring stable component supply, long-lifecycle support, and halogen-free RoHS compliance.
Supply support for SM15T24A-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, and protection devices with emphasis on reliability, power handling, and automotive qualification.
The SM15T Series was engineered specifically for high-energy transient suppression in 12 V–220 V DC systems, targeting automotive, industrial, and telecom applications where robustness against lightning and inductive switching surges is mandatory.
FAQ
What is the clamping voltage of SM15T24A-M3/9AT at its rated peak pulse current?
The SM15T24A-M3/9AT 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 terminal and defines the upper voltage limit imposed on protected circuitry during surge events. The SM15T24A-M3/9AT maintains this clamping performance across its specified operating temperature range.
Is SM15T24A-M3/9AT qualified for automotive use?
SM15T24A-M3/9AT itself is halogen-free and RoHS-compliant, but full AEC-Q101 qualification requires the HM3 suffix variant (e.g., SM15T24AHM3_A/I). The M3 suffix indicates material compliance, while HM3 adds the automotive stress testing and lot traceability required by Tier 1 suppliers. Engineers designing for automotive applications should specify the HM3 version to ensure qualification documentation is available for PPAP submission.
What does the "9AT" in SM15T24A-M3/9AT indicate?
The "9AT" in SM15T24A-M3/9AT is Vishay's packaging code denoting 13-inch diameter plastic tape and reel with a base quantity of 3500 units. It specifies the delivery format and is distinct from the M3 environmental suffix. This packaging supports high-volume automated SMT placement and is compatible with standard pick-and-place feeders used in electronics manufacturing.
How does SM15T24A-M3/9AT differ from SM15T24CA-M3/9AT?
SM15T24A-M3/9AT is unidirectional with a cathode band marking, while SM15T24CA-M3/9AT is bidirectional and unmarked. The "CA" suffix denotes symmetrical breakdown in both directions, enabling AC-line or differential-signal protection. Their VWM, VBR, and VC values differ accordingly: SM15T24CA has VWM = 20.5 V but clamps equally in both polarities, whereas SM15T24A-M3/9AT only clamps in reverse bias and conducts forward during polarity reversal.
What is the thermal resistance of SM15T24A-M3/9AT, and how does it affect layout?
The SM15T24A-M3/9AT 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. This value assumes no additional heatsinking; reducing pad size or omitting thermal vias increases RθJA, risking junction overheating during repeated surges. For reliable operation above 25 °C ambient, designers must maintain minimum pad dimensions and consider thermal vias to inner ground planes.
SM15T24A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SM15T24A-M3/9AT FAQ
1.How can I place an order for SM15T24A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T24A-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 SM15T24A-M3/9AT reliable?
The price and inventory of SM15T24A-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 SM15T24A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T24A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T24A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T24A-M3/9AT?
SM15T24A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T24A-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 SM15T24A-M3/9AT?
For technical support, including SM15T24A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T24A-M3/9AT requirements.
6.How does Aetrix verify that SM15T24A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T24A-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 SM15T24A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T24A-M3/9AT?
All SM15T24A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T24A-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 SM15T24A-M3/9AT part is unused and in its original packaging.
Return procedure for SM15T24A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T24A-M3/9AT Tags
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