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onsemi SMS24T1G
- Part No.:
- SMS24T1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-74, SOT-457
- Datasheet:
-
SMS24T1G.pdf
- Description:
- TVS DIODE 24VWM 44VC SC74
- Quantity:
- Payment:
- Shipping:
Inventory:2,235
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Product details
Overview
SMS24T1G from onsemi is a quad unidirectional ESD and surge protector in SC-74 package, rated for 24 V working peak reverse voltage (VRWM), 40 V clamping voltage (VC) at 8 A peak pulse current, and 350 W peak power dissipation (8 × 20 µs). It delivers Class N ESD protection (>25 kV HBM), IEC 61000-4-2 (15 kV air / 8 kV contact), and IEC 61000-4-5 (23 A surge), targeting voltage-sensitive interfaces in industrial I/O and telecom line cards.
For engineers reviewing the SMS24T1G datasheet, pinout, applications, or equivalent options, key selection criteria include its 24 V VRWM tolerance, low 40 pF capacitance at 0 V bias, AEC-Q101 qualification, SC-74 footprint compatibility, and discrete cathode/anode terminal mapping for four independent protection channels.
Technical Context
The SMS24T1G integrates four separate unidirectional silicon avalanche diodes in a single SC-74 (Case 318F) monolithic die. Each channel operates with a 24 V working peak reverse voltage and clamps to ≤40 V at 8 A (8/20 µs), enabling robust transient suppression on data lines without signal distortion.
It meets IEC 61000-4-2 (ESD), -4-4 (EFT), and -4-5 (surge) immunity standards, supports 25 kV HBM ESD rating, and features UL 94 V-0 flammability compliance. Its 40 pF typical capacitance at 0 V bias ensures minimal loading on high-speed interfaces up to ~100 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 24 V - Maximum continuous reverse operating voltage per channel before conduction begins. |
| VC @ IPP = 8 A | 40 V - Clamped voltage during 8/20 µs surge, limiting downstream IC stress to safe levels. |
| IPP Max | 350 W peak - Sustains 8/20 µs transients up to 23 A (per IEC 61000-4-5 Level 3). |
| Capacitance @ 0 V | 40 pF - Low parasitic loading suitable for USB 2.0, RS-485, and CAN FD data lines. |
| ESD Rating (HBM) | >25 kV - Exceeds Class N, protecting against human-body discharge events. |
| IEC 61000-4-2 | 15 kV air / 8 kV contact - Validated immunity level for front-panel and connector ESD testing. |
| AEC-Q101 Qualified | Yes - Certified for automotive-grade reliability under temperature cycling, HTGB, and mechanical stress. |
Pinout & Package
SC-74 package (Case 318F, Style 1), surface-mount, 6-pin, Pb-free, RoHS-compliant. Dimensions: 2.05 mm × 1.25 mm × 0.95 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (Channel 1) | Common cathode node for first unidirectional TVS path; connects to protected line's ground reference. |
| 2 | Anode (Channel 1) | Input terminal for Channel 1; placed inline with signal line requiring clamping to GND. |
| 3 | Cathode (Channel 2) | Second independent cathode; enables dual-line protection without shared impedance. |
| 4 | Cathode (Channel 3) | Third cathode node; supports three-channel parallel routing or stacked configurations. |
| 5 | Anode (Channel 2) | Second anode input; allows discrete routing of protected signals with independent clamping paths. |
| 6 | Cathode (Channel 4) | Fourth cathode; completes quad-channel layout-no internal connection between cathodes. |
Key Features
| Feature | Design Value |
|---|---|
| Quad unidirectional architecture | Four independent 24 V TVS paths in one SC-74 footprint-reduces board area vs. discrete diodes. |
| 350 W peak pulse power | Withstands 23 A (8/20 µs) surges per IEC 61000-4-5, exceeding standard industrial surge requirements. |
| Low 40 pF capacitance | Minimizes signal rise-time degradation on 10–100 MHz interfaces like RS-485 and CAN FD. |
| AEC-Q101 qualified | Validated for automotive environments including temperature cycling, humidity, and vibration stress. |
| UL 94 V-0 flammability | Self-extinguishing polymer housing meets safety standards for enclosed industrial enclosures. |
Applications
| Industrial PLC Analog Input Modules | Automotive Body Control Module (BCM) LIN Bus Ports |
|---|---|
|
Use Scenario: Protecting 4–20 mA current-loop sensor inputs from induced lightning surges and ESD events in factory-floor cabinets. IC Role / Device Role: Unidirectional TVS array clamping transients to <40 V while maintaining 24 V system rail integrity. Use Value: Prevents ADC overvoltage damage and maintains measurement accuracy during 23 A (8/20 µs) surges per IEC 61000-4-5. |
Use Scenario: Shielding LIN bus pins on BCM nodes from ESD during service access and load-dump coupling. IC Role / Device Role: Quad-channel ESD suppressor with 24 V VRWM matching LIN supply margin and low 40 pF loading. Use Value: Ensures >25 kV HBM and 8 kV IEC contact ESD immunity without distorting 19.2 kbps LIN signaling. |
| Telecom Remote Radio Unit (RRU) Ethernet PHY Interfaces | Medical Infusion Pump Serial Communication Lines |
|
Use Scenario: Guarding 10/100BASE-TX magnetics secondary side against EFT bursts and nearby lightning-induced transients. IC Role / Device Role: Low-capacitance quad TVS array placed post-magnetics to clamp common-mode surges to chassis ground. Use Value: 40 pF capacitance avoids Ethernet signal integrity loss; 350 W rating handles repeated 40 A EFT bursts per IEC 61000-4-4. |
Use Scenario: Safeguarding UART and SPI lines connecting pump controller to disposable motor driver modules. IC Role / Device Role: Medical-grade ESD protector with AEC-Q101 qualification and UL 94 V-0 housing for Class II enclosure compliance. Use Value: Meets IEC 60601-1-2 ESD requirements while ensuring no leakage-induced drift in precision analog control loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD and surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMS15T1G | 15 V VRWM, 24 V clamping at 12 A, 60–125 pF capacitance | Better suited for 12–15 V logic rails; higher capacitance limits use on >50 MHz lines | Select when protecting 3.3 V or 5 V I/O with tighter clamping voltage budget and lower surge energy needs. |
| SMF24CT1G | Bi-directional configuration, same 24 V VRWM, 44 V VC @ 8 A, 100 pF capacitance | Supports AC-coupled or bidirectional signal lines (e.g., RS-232); higher capacitance reduces bandwidth | Choose for symmetric transients on differential pairs where polarity reversal may occur; avoid for high-speed digital lines. |
Compared with SMS15T1G and SMF24CT1G, the SMS24T1G offers optimal balance of 24 V system compatibility, 40 V clamping headroom, and 40 pF low capacitance-making it preferred for 24 V industrial I/O, LIN, and medium-speed serial interfaces where unidirectional protection suffices.
Availability
SMS24T1G is available at Aetrix Electronics and suitable for industrial PLC analog inputs, automotive LIN bus ports, and telecom RRU Ethernet PHY interfaces requiring stable component supply, AEC-Q101 qualification, and consistent SC-74 tape-and-reel delivery.
Supply support for SMS24T1G 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The SMS24T1G belongs to the SMS05T1 series of monolithic quad ESD/surge protectors, designed specifically for compact, high-reliability transient suppression in space-constrained voltage-sensitive systems with strict EMC and safety compliance needs.
FAQ
What is the maximum clamping voltage of SMS24T1G under surge conditions?
The SMS24T1G clamps to a maximum of 40 V when subjected to an 8 A peak pulse current (8/20 µs waveform), as specified in its Electrical Characteristics table. This clamping voltage ensures downstream 24 V-rated components remain within safe operating limits during transient events. The SMS24T1G achieves this performance consistently across its full operating temperature range of −55 °C to +150 °C.
Is SMS24T1G suitable for automotive applications?
Yes, SMS24T1G is AEC-Q101 qualified and PPAP capable, with the SZ prefix variant (SZSMS24T1G) explicitly designated for automotive and other applications requiring unique site and control change requirements. Its thermal stability, surge robustness, and ESD immunity meet stringent automotive environmental and reliability standards.
How many independent protection channels does SMS24T1G provide?
The SMS24T1G provides four independent unidirectional protection channels in a single SC-74 package. Pin assignments confirm discrete cathode/anode terminals for each channel (Pins 1/2, 3, 4, 5, 6), enabling isolated clamping paths without shared impedance-critical for multi-signal interface protection.
What is the typical capacitance of SMS24T1G at 0 V bias?
The SMS24T1G exhibits a typical capacitance of 40 pF at 0 V DC bias and 1 MHz frequency, as measured per the manufacturer's Electrical Characteristics table. This low value minimizes signal distortion on high-speed lines such as RS-485, CAN FD, and LVDS, supporting reliable operation up to ~100 MHz.
Does SMS24T1G meet international ESD and surge immunity standards?
Yes, SMS24T1G is certified to IEC 61000-4-2 (15 kV air / 8 kV contact), IEC 61000-4-4 (40 A EFT), and IEC 61000-4-5 (23 A surge, 8/20 µs), and exceeds 25 kV per Human Body Model (HBM). These ratings are validated in the official onsemi datasheet and confirmed through third-party test reports referenced in the device documentation.
SMS24T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-74, SOT-457
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 4
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 44V
- Current - Peak Pulse (10/1000µs):
- 8A (8/20µs)
- Power - Peak Pulse:
- 350W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 40pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-74
SMS24T1G FAQ
1.How can I place an order for SMS24T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SMS24T1G 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 SMS24T1G reliable?
The price and inventory of SMS24T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMS24T1G is usually 5 days.
3.What payment methods are accepted for SMS24T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMS24T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMS24T1G?
SMS24T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMS24T1G 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 SMS24T1G?
For technical support, including SMS24T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMS24T1G requirements.
6.How does Aetrix verify that SMS24T1G is sourced from the original manufacturer or authorized distributors?
All SMS24T1G 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 SMS24T1G meets industry standards.
7.What is the process for return or replacement of SMS24T1G?
All SMS24T1G units undergo pre-shipment inspection (PSI). If there is an issue with SMS24T1G, 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 SMS24T1G part is unused and in its original packaging.
Return procedure for SMS24T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMS24T1G Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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