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Vishay General Semiconductor - Diodes Division SM15T24A-M3/57T
- Part No.:
- SM15T24A-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T24A-M3/57T.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,103
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Product details
Overview
SM15T24A-M3/57T from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection on power and signal lines. It features 24 V standoff voltage (VWM = 20.5 V), 22.8–25.2 V breakdown (VBR at 1 mA), 33.2 V clamping voltage (VC) at 45 A peak pulse current (IPPM), and 1500 W peak pulse power (10/1000 μs). It is widely used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SM15T24A-M3/57T datasheet, SM15T24A-M3/57T pinout, SM15T24A-M3/57T application, or SM15T24A-M3/57T equivalent, key selection criteria include clamping performance under 45 A surge, thermal resistance (RθJA = 75 °C/W), halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SM15T24A-M3/57T operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its 22.8–25.2 V breakdown threshold and clamping transients to ≤33.2 V at 45 A. Its glass-passivated junction ensures stable breakdown and low leakage (<1 μA at 20.5 V).
Designed for 10/1000 μs lightning-surge waveforms per IEC 61000-4-5, it delivers 1500 W peak pulse power with low inductance and meets MSL Level 1 (260 °C reflow). Failure mode under overstress is short-circuit, supporting fail-safe system design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20.5 V - Maximum continuous reverse voltage before conduction begins; defines operating margin below clamping. |
| VBR (Breakdown Voltage) | 22.8–25.2 V at 1 mA - Confirmed avalanche onset range; ensures reliable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 33.2 V at IPPM = 45 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; critical for downstream IC survival. |
| PPPM (Peak Pulse Power) | 1500 W - Energy-handling capability for lightning-induced transients; validated on 8.0 mm × 8.0 mm copper pads. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance; determines derating above 25 °C ambient for sustained reliability. |
| Package | SMC (DO-214AB) - Surface-mount outline with cathode band marking; supports automated placement and IPC-compliant reflow. |
| Compliance | Halogen-free, RoHS-compliant (M3 suffix); meets JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1. |
Pinout & Package
SM15T24A-M3/57T uses the SMC (DO-214AB) package: molded plastic case with matte tin-plated leads, cathode indicated by a band on the body. Mounting requires minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal for rated PPPM performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to lower-potential side of protected line; defines polarity for unidirectional operation. |
| Cathode | Avalanche conduction node / Clamping output | Marked with band; connected to higher-potential side (e.g., VBUS or signal line); sinks surge current to ground path. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 lightning surges without external series impedance. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes stress on downstream components-e.g., keeps 24 V rail transients below 33.2 V at 45 A. |
| Glass-passivated junction | Ensures stable VBR over temperature and lifetime; reduces parameter drift vs. epoxy-passivated alternatives. |
| MSL Level 1 rating (260 °C peak) | Supports standard lead-free reflow without pre-baking; eliminates moisture-related popcorning risk. |
| Halogen-free & RoHS-compliant (M3) | Fulfills environmental compliance for automotive and industrial OEMs; avoids brominated flame retardants. |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24 V supply rails in engine control units (ECUs) and body electronics against load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between VBAT and ground, absorbing >100 A surge energy via controlled avalanche. Use Value: Limits rail voltage to ≤33.2 V during 45 A transients, preventing damage to 36 V-rated DC-DC converters and microcontrollers. |
Use Scenario: Shielding analog and digital input/output channels in programmable logic controllers from inductive switching noise and EFT bursts. IC Role / Device Role / Timing Role: Point-of-entry protection on field-side signal lines (e.g., 4–20 mA loops, RS-485 buses), shunting fast transients before conditioning circuitry. Use Value: Clamps 1 kV/50 Ω EFT events to sub-35 V levels within nanoseconds, preserving ADC accuracy and isolator integrity. |
| Consumer Appliance Motor Drive Protection | Telecom Power Interface Protection |
Use Scenario: Safeguarding H-bridge gate drivers and current-sense amplifiers in smart home appliances (e.g., washing machine motor controllers) from back-EMF spikes. IC Role / Device Role / Timing Role: Mounted across motor coil terminals or near half-bridge outputs to clamp inductive kickback before it reaches logic-level FETs. Use Value: Withstands 200 A IFSM (10 ms half-sine), enabling single-device protection of 500 W motor drives without parallel devices. |
Use Scenario: Front-end surge suppression on 48 V PoE-powered telecom equipment (e.g., base station radios, remote PHY units) exposed to outdoor lightning coupling. IC Role / Device Role / Timing Role: Primary protection stage upstream of DC-DC modules and Ethernet PHYs, handling 10/1000 μs surges per ITU-T K.21. Use Value: Delivers 1500 W pulse handling with <1 ns response time, reducing secondary protector stress and extending system MTBF. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A-E3/57T | Lower PPPM (400 W), same VWM (20.5 V), larger VBR tolerance (22.2–25.8 V), SMA package (higher RθJA = 110 °C/W) | Suitable only for lower-energy threats (IEC 61000-4-4 EFT); not recommended for lightning-level surges. | Select SM15T24A-M3/57T when 1500 W pulse rating and SMC thermal performance are required. |
| SMCJ24A-M3/57T | Same PPPM (1500 W), identical VWM/VBR/VC specs, same SMC package, but rated for 150 °C TJ max and AEC-Q101 qualification (HM3 suffix variant) | Required for automotive-grade designs needing AEC-Q101 validation; otherwise functionally interchangeable. | Choose SM15T24A-M3/57T for commercial/industrial use; upgrade to SMCJ24A-HM3/57T if AEC-Q101 compliance is mandatory. |
Compared with SMAJ24A-E3/57T, SM15T24A-M3/57T provides 275 % higher surge energy capacity and superior thermal dissipation; versus SMCJ24A-M3/57T, it offers identical protection specs at lower cost but without AEC-Q101 qualification-making it optimal for non-automotive high-reliability systems.
Availability
SM15T24A-M3/57T is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, and telecom power interfaces requiring stable component supply, halogen-free compliance, and high-energy transient immunity.
Supply support for SM15T24A-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, and protection devices with emphasis on reliability, power handling, and automotive qualification.
The SM15T Series was engineered for high-power transient suppression in harsh environments-targeting 24 V and 48 V systems where lightning, load dump, and inductive switching demand 1500 W pulse capability in compact SMC form factor.
FAQ
What is the maximum clamping voltage of the SM15T24A-M3/57T under standard test conditions?
The SM15T24A-M3/57T has a maximum clamping voltage (VC) of 33.2 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 45 A. This value is measured with the device mounted on 8.0 mm × 8.0 mm copper pads per terminal, per Vishay Document 88380. The SM15T24A-M3/57T maintains this clamping performance across its specified operating temperature range.
Does the SM15T24A-M3/57T meet automotive qualification standards?
The SM15T24A-M3/57T is halogen-free and RoHS-compliant (M3 suffix) but is not AEC-Q101 qualified. For automotive applications requiring AEC-Q101 validation, Vishay offers the SMCJ24A-HM3/57T variant. The SM15T24A-M3/57T is intended for commercial and industrial use where AEC-Q101 is not mandated, though it shares identical electrical specs and SMC packaging with its qualified counterpart.
What is the thermal resistance of the SM15T24A-M3/57T, and how does it affect PCB layout?
The SM15T24A-M3/57T 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. To achieve rated 1500 W pulse power, the PCB must provide at least this pad area per terminal. Reducing pad size increases RθJA, requiring derating of peak pulse current per Figure 2 in Vishay Document 88380. The SM15T24A-M3/57T's thermal performance directly impacts sustained surge handling capability.
How does the SM15T24A-M3/57T differ from bidirectional TVS diodes like SM15T24CA?
The SM15T24A-M3/57T is unidirectional and features a cathode band marking; it conducts only in reverse bias above VBR and blocks forward current up to 200 A IFSM. In contrast, SM15T24CA is bidirectional, with symmetrical clamping in both directions and no polarity marking. The SM15T24A-M3/57T is selected for DC power rail protection where polarity is fixed, while SM15T24CA suits AC or differential signal lines like RS-485.
What is the reverse leakage current specification for the SM15T24A-M3/57T at its stand-off voltage?
The SM15T24A-M3/57T exhibits a maximum reverse leakage current (ID) of 1.0 μA at its stand-off voltage (VWM) of 20.5 V, measured at TA = 25 °C. This low leakage ensures minimal power loss in standby operation and prevents false triggering in high-impedance circuits. The SM15T24A-M3/57T maintains this specification across its full operating temperature range, supporting precision sensing and battery-powered applications.
SM15T24A-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:
- 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-M3/57T FAQ
1.How can I place an order for SM15T24A-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T24A-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 SM15T24A-M3/57T reliable?
The price and inventory of SM15T24A-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 SM15T24A-M3/57T is usually 5 days.
3.What payment methods are accepted for SM15T24A-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T24A-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T24A-M3/57T?
SM15T24A-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T24A-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 SM15T24A-M3/57T?
For technical support, including SM15T24A-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T24A-M3/57T requirements.
6.How does Aetrix verify that SM15T24A-M3/57T is sourced from the original manufacturer or authorized distributors?
All SM15T24A-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 SM15T24A-M3/57T meets industry standards.
7.What is the process for return or replacement of SM15T24A-M3/57T?
All SM15T24A-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SM15T24A-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 SM15T24A-M3/57T part is unused and in its original packaging.
Return procedure for SM15T24A-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T24A-M3/57T Tags
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