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onsemi SMS24T1
- Part No.:
- SMS24T1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-74, SOT-457
- Datasheet:
-
SMS24T1.pdf
- Description:
- TVS DIODE 24VWM 44VC SC74
- Quantity:
- Payment:
- Shipping:
Inventory:5,559
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Product details
Overview
SMS24T1 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 automotive infotainment systems.
For engineers reviewing the SMS24T1 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin vs. protected IC VCC, capacitance (40–75 pF) impact on high-speed signal integrity, AEC-Q101 qualification for automotive use, and SC-74 footprint compatibility with space-constrained PCB layouts.
Technical Context
The SMS24T1 integrates four independent unidirectional silicon avalanche diodes in a single SC-74 (Case 318F) monolithic die. Each channel operates as a low-capacitance transient voltage suppressor with defined breakdown (26.7–32 V), clamping (40 V @ 8 A), and leakage (<1 µA @ 24 V) characteristics under standardized surge waveforms.
It meets IEC 61000-4-2/4-4/4-5 immunity requirements without external biasing or control logic. Thermal design relies on FR-5 board derating (1.8 mW/°C above 25°C) and junction-to-ambient thermal resistance of 556 °C/W, limiting continuous power handling to 225 mW.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 24 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected line voltage. |
| VC @ IPP = 8 A | 40 V - Clamping voltage during 8/20 µs surge; must remain below protected IC's absolute maximum rating. |
| IPP Max | 350 W peak - Surge energy handling capability per channel under 8 × 20 µs waveform; defines robustness against lightning-induced transients. |
| C @ 0 V, 1 MHz | 40–75 pF - Junction capacitance affecting signal rise time and bandwidth; critical for USB 2.0, HDMI, or CAN FD lines. |
| ESD Rating (HBM) | >25 kV - Human Body Model withstand level; ensures reliability during manual handling and board assembly. |
| IEC 61000-4-5 | 23 A (8/20 µs) - Surge current immunity level; validates performance against AC mains-coupled surges in industrial environments. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade temperature cycling, humidity, and mechanical stress; supports PPAP documentation. |
Pinout & Package
Package: SC-74 (Case 318F), surface-mount, 6-pin, Pb-free, RoHS-compliant. Dimensions per ON Semiconductor drawing 98ASB42973B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Anode-side connection point for Channel 1; ties to protected signal line when used in unidirectional configuration. |
| 2 | Anode | Ground reference for Channel 1; connects to system GND or local chassis return path. |
| 3 | Cathode | Anode-side connection for Channel 2; enables independent protection of second signal line (e.g., differential pair leg). |
| 4 | Cathode | Anode-side connection for Channel 3; supports triple-line protection (e.g., RS-485 A/B and enable). |
| 5 | Anode | Shared ground terminal for Channels 2 and 3; reduces PCB trace count versus discrete diodes. |
| 6 | Cathode | Anode-side connection for Channel 4; completes quad-channel layout for multi-signal interface protection. |
Key Features
| Feature | Design Value |
|---|---|
| Quad unidirectional architecture | Four independent ESD paths in one SC-74 footprint-reduces board area by ~60% vs. four discrete SOD-323 devices. |
| 350 W peak power rating | Withstands 8/20 µs surges up to 23 A per IEC 61000-4-5-exceeds legacy MMQA series by >2× energy handling. |
| Low clamping voltage (40 V @ 8 A) | Minimizes overvoltage stress on downstream 24 V-rated transceivers or microcontrollers during surge events. |
| 40–75 pF capacitance | Enables use on 10–50 Mbps industrial buses (e.g., CAN, RS-485) without signal distortion or timing skew. |
| AEC-Q101 qualification | Validated for automotive under-hood and infotainment applications-supports zero-defect supply chain requirements. |
Applications
| Industrial PLC Analog I/O | Automotive Infotainment Display Interface |
|---|---|
Use Scenario: Protecting 0–10 V analog input channels on programmable logic controller modules from induced surges on factory floor wiring. IC Role / Device Role / Timing Role: Unidirectional TVS array clamping transient overvoltage before it reaches ADC front-end or op-amp buffer. Use Value: Maintains signal fidelity under 23 A IEC 61000-4-5 surges while adding only 40–75 pF loading to <100 kHz measurement bandwidth. |
Use Scenario: Safeguarding LVDS or FPD-Link III video data lanes between head unit and TFT display in vehicles exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Low-capacitance ESD clamp placed directly at connector to suppress ESD and fast transients before signal conditioning ICs. Use Value: Enables AEC-Q101-compliant protection with 40 V clamping margin below 45 V display IC absolute max ratings. |
| RS-485 Communication Port | 24 V DC Power Input Stage |
Use Scenario: Shielding half-duplex RS-485 transceiver (e.g., SN65HVD72) on building automation nodes from cable-induced EFT and lightning surges. IC Role / Device Role / Timing Role: Quad TVS providing separate protection for A, B, RE/DE control, and GND-referenced shield connections. Use Value: Delivers 23 A surge immunity per line while maintaining <1 ns response time and preserving 20 Mbps data integrity. |
Use Scenario: Front-end transient suppression on 24 V DC input rails powering industrial sensors and actuators connected to long cables. IC Role / Device Role / Timing Role: Primary surge limiter absorbing 350 W peak energy before upstream fuse or DC-DC converter. Use Value: Limits input rail overshoot to ≤40 V during 8/20 µs surges, preventing latch-up or damage to 24 V-rated regulators. |
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 |
|---|---|---|---|
| SZSMF24CT1G | Bi-directional configuration; 24 V VRWM; 38.9 V VC @ 10 A; higher capacitance (100 pF) | Better suited for AC-coupled or bidirectional signal lines (e.g., USB D+/D−); less ideal for DC-biased 24 V rails due to leakage asymmetry. | Choose when protecting symmetrical signals where reverse polarity transients are possible. |
| TPD2E001DRYR | Single-channel, 5.5 V VRWM; 12 V VC @ 1 A; ultra-low capacitance (3.5 pF); not AEC-Q101 qualified | Targeted at high-speed digital interfaces (USB 2.0, HDMI); insufficient for 24 V system-level surge protection. | Select only for low-voltage, high-bandwidth data lines-not a functional replacement for SMS24T1 in 24 V power or industrial I/O roles. |
Compared with SZSMF24CT1G and TPD2E001DRYR, the SMS24T1 uniquely combines 24 V unidirectional clamping, 350 W surge rating, AEC-Q101 qualification, and quad-channel integration-making it the only option among the three validated for automotive 24 V sensor hub and industrial fieldbus protection.
Availability
SMS24T1 is available at Aetrix Electronics and suitable for industrial PLC analog I/O, automotive infotainment display interfaces, and RS-485 communication ports requiring stable component supply across extended product lifecycles.
Supply support for SMS24T1 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 management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The SMS24T1 belongs to the SMS05T1 Series of quad ESD/surge protectors designed specifically for compact, high-reliability transient suppression in space-constrained 24 V industrial and automotive subsystems.
FAQ
What is the clamping voltage of SMS24T1 at 8 A peak pulse current?
The SMS24T1 has a maximum clamping voltage (VC) of 40 V when subjected to an 8/20 µs surge current of 8 A, as specified in the Electrical Characteristics table on page 2 of the official datasheet. This value ensures protected 24 V circuits remain within safe operating limits during transient events. The SMS24T1 maintains this clamping performance across its full operating temperature range of −55°C to +150°C.
Is SMS24T1 qualified for automotive applications?
Yes, SMS24T1 is AEC-Q101 qualified and PPAP capable, as confirmed in the Ordering Information section of the datasheet. The "SZ" prefix variant (SZSMS24T1G) explicitly denotes automotive-grade manufacturing controls and site-specific change management. The SMS24T1 meets rigorous stress testing for temperature cycling, humidity, and mechanical shock required for under-hood and infotainment use cases.
What is the capacitance of SMS24T1 and how does it affect high-speed signals?
The SMS24T1 exhibits 40–75 pF capacitance at 0 V bias and 1 MHz, per the Electrical Characteristics table. This low capacitance allows use on moderate-speed interfaces like RS-485 (≤50 Mbps) and CAN FD (≤5 Mbps) without significant signal rise-time degradation or reflection. For higher-speed links such as USB 3.0 or PCIe, lower-capacitance alternatives would be required-SMS24T1 is not intended for those applications.
How many independent protection channels does SMS24T1 provide?
The SMS24T1 provides four independent unidirectional ESD/surge protection channels in a single SC-74 package. Pin assignments confirm separate cathode/anode pairs for each channel (Pins 1/2, 3, 4, 5, 6), enabling discrete protection of up to four signal lines-such as RS-485 A/B, enable, and shield-or multiple 24 V I/O lines on a compact PCB.
Does SMS24T1 meet IEC 61000-4-2, -4-4, and -4-5 standards?
Yes, SMS24T1 is rated per IEC 61000-4-2 (15 kV air / 8 kV contact), IEC 61000-4-4 (40 A EFT, 5/5 ns), and IEC 61000-4-5 (23 A surge, 8/20 µs), as stated in the Features section of the datasheet. These certifications validate its suitability for electromagnetic compatibility compliance in industrial and automotive end equipment where immunity to electrostatic discharge, electrical fast transients, and lightning-induced surges is mandatory.
SMS24T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-74, SOT-457
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
SMS24T1 FAQ
1.How can I place an order for SMS24T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMS24T1 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 SMS24T1 reliable?
The price and inventory of SMS24T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMS24T1 is usually 5 days.
3.What payment methods are accepted for SMS24T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMS24T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMS24T1?
SMS24T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMS24T1 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 SMS24T1?
For technical support, including SMS24T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMS24T1 requirements.
6.How does Aetrix verify that SMS24T1 is sourced from the original manufacturer or authorized distributors?
All SMS24T1 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 SMS24T1 meets industry standards.
7.What is the process for return or replacement of SMS24T1?
All SMS24T1 units undergo pre-shipment inspection (PSI). If there is an issue with SMS24T1, 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 SMS24T1 part is unused and in its original packaging.
Return procedure for SMS24T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMS24T1 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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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
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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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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Diodes Incorporated
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