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Vishay General Semiconductor - Diodes Division SM6T24A-M3/5B
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- Part No.:
- SM6T24A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T24A-M3/5B.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,354
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Product details
Overview
SM6T24A-M3/5B from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, with 24 V standoff voltage (VWM = 20.5 V), 22.8–25.2 V breakdown voltage (VBR), 33.2 V clamping voltage at 18 A (VC), 600 W peak pulse power (10/1000 μs), and 1.0 μA max reverse leakage at VWM - deployed for overvoltage protection of automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the SM6T24A-M3/5B datasheet, SM6T24A-M3/5B pinout, SM6T24A-M3/5B application, or SM6T24A-M3/5B equivalent, key selection criteria include clamping performance under 10/1000 μs transients, thermal resistance (RθJA = 100 °C/W), halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
The SM6T24A-M3/5B operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its specified breakdown range (22.8–25.2 V at 1.0 mA test current). Its low-inductance SMB package enables fast response to ESD and lightning-induced transients, with clamping action limiting downstream voltage to ≤33.2 V at 18 A peak pulse current.
Thermal design relies on junction-to-ambient thermal resistance of 100 °C/W (typical) and maximum junction temperature of +150 °C. It is rated for non-repetitive surge currents up to 100 A (10 ms half-sine) and meets J-STD-020 MSL Level 1 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20.5 V - Maximum continuous reverse operating voltage before significant conduction begins |
| VBR (Breakdown Voltage) | 22.8–25.2 V at 1.0 mA - Confirmed avalanche initiation range under DC test conditions |
| VC (Clamping Voltage) | 33.2 V at IPPM = 18 A (10/1000 μs) - Peak voltage seen by protected circuit during standardized surge |
| PPPM (Peak Pulse Power) | 600 W - Surge energy handling capacity per single transient event |
| ID (Reverse Leakage) | ≤1.0 μA at VWM - Minimal standby power loss and signal integrity impact in high-impedance circuits |
| RθJA | 100 °C/W - Thermal resistance defining junction temperature rise above ambient at 5.0 mm × 5.0 mm pad layout |
| Polarity | Unidirectional - Cathode marked by band; blocks forward current, clamps reverse overvoltage |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads, MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when reverse voltage exceeds VBR |
| Anode | Reference node / ground return | Typically tied to system ground or low-impedance return path to complete clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV) in industrial and automotive environments |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes voltage overshoot during transients, reducing stress on downstream ICs like microcontrollers and CAN transceivers |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for automotive and consumer electronics without compromising surge performance |
| MSL Level 1 rating | Supports standard lead-free reflow profiles without preconditioning, simplifying manufacturing integration |
| Low inductance SMB package | Reduces voltage overshoot during fast-rising transients (e.g., ESD >1 kV/ns), critical for high-speed signal line protection |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of engine coolant temperature sensors exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between sensor output and ECU input to limit transient voltage to safe levels. Use Value: Clamps 10/1000 μs surges to ≤33.2 V while maintaining <1.0 μA leakage at 20.5 V, preserving sensor accuracy and ECU interface integrity. |
Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from inductive switching spikes. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across input terminals to shunt transient energy before it reaches optocoupler or MCU input stage. Use Value: Withstands 100 A surge (10 ms) and delivers 600 W pulse power, enabling reliable operation in factory automation with contactor-driven loads. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Safeguarding RS-485 transceiver pins in base station backhaul modules against lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional-capable family variant used (e.g., SM6T24CA), but SM6T24A-M3/5B serves as unidirectional alternative where polarity is controlled. Use Value: 33.2 V clamping ensures transceiver remains within absolute maximum ratings even during 1 kV/μs fast transients. |
Use Scenario: Suppressing flyback voltage from brushed DC motors in smart washing machines during PWM commutation. IC Role / Device Role / Timing Role: Mounted across motor terminals to absorb inductive kickback energy and prevent MOSFET drain-source overvoltage. Use Value: 20.5 V VWM aligns with 24 V supply rails; 600 W PPPM handles repetitive switching events without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A-E3/57 | Same SMB package, 24 V VWM, but lower PPPM (400 W), higher VC (38.9 V at 10.3 A) | Less robust for high-energy surges; suitable for cost-sensitive consumer designs with lower threat levels | Select SMAJ24A-E3/57 only if system-level surge testing confirms 400 W suffices and layout allows tighter thermal margin |
| SMCJ24A-M3/57 | Larger SMC (DO-214AB) package, same VWM/VC specs, higher PPPM (1500 W), RθJA = 25 °C/W | Better thermal performance and surge margin, but requires larger PCB footprint and different reflow profile | Choose SMCJ24A-M3/57 when protecting high-power industrial drives where 600 W is insufficient and board space permits SMC |
Compared with SMAJ24A-E3/57 and SMCJ24A-M3/57, the SM6T24A-M3/5B delivers optimal balance of 600 W surge capability, compact SMB footprint, and halogen-free compliance - making it preferred for space-constrained automotive and industrial modules requiring validated MSL Level 1 manufacturability.
Availability
SM6T24A-M3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, and telecom line conditioning requiring stable component supply, consistent halogen-free compliance, and verified surge performance per IEC 61000-4-5.
Supply support for SM6T24A-M3/5B 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, automotive qualification, and application-specific performance.
The SM6T Series was engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where compact size, repeatable clamping, and AEC-Q101 readiness (via HE3/HM3 variants) are essential.
FAQ
What is the maximum clamping voltage of the SM6T24A-M3/5B under standard test conditions?
The SM6T24A-M3/5B has a maximum clamping voltage (VC) of 33.2 V when subjected to a 10/1000 μs waveform at 18 A peak pulse current. This value is measured per Figure 1 in Vishay document 88385 and defines the upper voltage limit imposed on protected circuitry during surge events. The SM6T24A-M3/5B maintains this clamping performance across its qualified operating temperature range.
Is the SM6T24A-M3/5B suitable for automotive applications?
Yes - the SM6T24A-M3/5B is halogen-free and RoHS-compliant (M3 suffix), and belongs to the AEC-Q101-qualified SM6T family. While the base SM6T24A-M3/5B itself is commercial-grade, its HM3 automotive-grade variant (e.g., SM6T24AHM3_B/I) is explicitly qualified. Designers may use SM6T24A-M3/5B in non-safety-critical automotive subsystems where full AEC-Q101 validation is not mandated, leveraging its proven SMB reliability and thermal performance.
What does the "M3/5B" suffix indicate in SM6T24A-M3/5B?
The "M3" suffix denotes halogen-free, RoHS-compliant construction with JESD 201 Class 2 whisker resistance. The "5B" indicates packaging in 13-inch diameter plastic tape and reel, with a base quantity of 3200 units. This format supports high-volume automated SMT assembly and is documented in Vishay's ordering information table (page 3, doc #88385). The SM6T24A-M3/5B is fully compatible with standard pick-and-place equipment calibrated for SMB devices.
How does the SM6T24A-M3/5B compare to bidirectional TVS diodes like SM6T24CA?
The SM6T24A-M3/5B is unidirectional, with cathode marked by a band and intended for DC-biased lines where polarity is fixed. In contrast, SM6T24CA provides symmetrical clamping for AC or floating signal paths. Both share identical VWM (20.5 V), VBR (22.8–25.2 V), and VC (33.2 V), but SM6T24A-M3/5B offers lower leakage (<1.0 μA) in forward bias and avoids ambiguity in grounding configuration - making it preferable for 24 V supply rail and sensor output protection where polarity is known.
What PCB layout guidance applies to the SM6T24A-M3/5B for optimal thermal and electrical performance?
Vishay specifies mounting the SM6T24A-M3/5B on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated PPPM and thermal resistance (RθJA = 100 °C/W). Traces should be short and wide to minimize inductance; avoid vias near terminals. The SM6T24A-M3/5B's low-inductance SMB package performs best when pads match the recommended outline (doc #88385, page 4), ensuring mechanical stability and thermal dissipation during repeated surge events.
SM6T24A-M3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, 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):
- 18A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMBJ)
SM6T24A-M3/5B FAQ
1.How can I place an order for SM6T24A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T24A-M3/5B 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 SM6T24A-M3/5B reliable?
The price and inventory of SM6T24A-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T24A-M3/5B is usually 5 days.
3.What payment methods are accepted for SM6T24A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T24A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T24A-M3/5B?
SM6T24A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T24A-M3/5B 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 SM6T24A-M3/5B?
For technical support, including SM6T24A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T24A-M3/5B requirements.
6.How does Aetrix verify that SM6T24A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SM6T24A-M3/5B 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 SM6T24A-M3/5B meets industry standards.
7.What is the process for return or replacement of SM6T24A-M3/5B?
All SM6T24A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T24A-M3/5B, 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 SM6T24A-M3/5B part is unused and in its original packaging.
Return procedure for SM6T24A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T24A-M3/5B Tags
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