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onsemi SM24T1G
- Part No.:
- SM24T1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SM24T1G.pdf
- Description:
- TVS DIODE 24VWM 43VC SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,960
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Product details
Overview
SM24T1G from onsemi is a dual common-anode ESD protection diode array in SOT-23 package, designed for transient overvoltage and electrostatic discharge protection of two signal lines. It features a 24 V working peak reverse voltage (VRWM), 43 V clamping voltage (VC) at 1 A peak pulse current, 5.0 A maximum peak pulse current (IPP), and 60 pF typical capacitance at 0 V bias - ideal for USB 2.0, HDMI, and industrial I/O port protection.
For engineers reviewing the SM24T1G datasheet, pinout, applications, or equivalent options, key selection criteria include unidirectional dual-line clamping capability, low capacitance for high-speed interfaces, UL 94 V-0 flammability rating, AEC-Q101 qualification, and Pb-free SOT-23 packaging with validated thermal performance on FR-5 and alumina substrates.
Technical Context
The SM24T1G implements a monolithic dual-junction silicon structure with shared anode (Pin 3) and separate cathodes (Pins 1 and 2), enabling independent protection of two signal paths without cross-talk. Its breakdown voltage (VBR) is specified at 26.7–31.35 V (min/max) with 1 mA test current, and it delivers 300 W peak pulse power per IEC 61000-4-5 (8/20 µs).
It meets IEC 61000-4-2 (±26 kV contact ESD), IEC 61000-4-4 (40 A EFT), and IEC 61000-4-5 (12 A lightning surge) standards. Thermal resistance is 556 °C/W on FR-5 board and 417 °C/W on alumina substrate, supporting reliable operation from −55 °C to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 24 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA; sets safe signal swing limit for protected lines. |
| VC @ IPP = 1 A | 43 V - clamped voltage during 8/20 µs surge; ensures downstream ICs see <43 V under 1 A transient. |
| IPP | 5.0 A - maximum non-repetitive peak pulse current the device can safely divert without failure. |
| Capacitance @ 0 V | 60 pF - low line-to-line capacitance preserves signal integrity in USB 2.0 (480 Mbps) and RS-485 applications. |
| Leakage @ VRWM | 1.0 µA - minimal DC loading on protected signal lines, critical for high-impedance sensor or analog inputs. |
| Package | SOT-23 (Case 318, Style 12) - surface-mount, 2.90 × 1.30 × 1.00 mm footprint; enables high-density PCB layout. |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress per AEC standard. |
Pinout & Package
SOT-23 package (Case 318, Style 12) with void-free thermosetting plastic case, corrosion-resistant finish, and 260°C soldering tolerance (10 s). Designed for automated placement and reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode (Line 1) | Protected signal path #1 input; connects to I/O line requiring clamping to common anode (Pin 3). |
| Pin 2 | Cathode (Line 2) | Protected signal path #2 input; electrically isolated from Pin 1 but shares same anode reference. |
| Pin 3 | Anode (Common) | Shared return node tied to system ground or local reference; establishes common clamping threshold for both lines. |
Key Features
| Feature | Design Value |
|---|---|
| Dual unidirectional protection | Two independent ESD paths in one SOT-23 package - eliminates need for discrete diodes and saves >50% board area vs. dual-SOT-23 solution. |
| Low clamping voltage | 43 V at 1 A pulse - limits voltage overshoot below 45 V, protecting 3.3 V and 5 V logic interfaces compliant with IEC 61000-4-2 Level 4. |
| UL 94 V-0 rated | Flame-retardant housing - satisfies safety requirements for medical, industrial, and consumer equipment enclosures. |
| Pb-free and RoHS compliant | "G" suffix denotes lead-free termination - meets global environmental regulations and supports lead-free reflow profiles. |
| High surge robustness | 300 W peak pulse power (8/20 µs) - withstands repeated lightning-induced surges in industrial fieldbus and automation systems. |
Applications
| USB 2.0 Port Protection | HDMI DDC Line Protection |
|---|---|
Use Scenario: Protecting USB 2.0 data lines (D+, D−) against ESD events during hot-plug insertion in embedded hosts and peripherals. IC Role / Device Role: Unidirectional transient voltage suppressor placed between connector and USB transceiver IC. Use Value: 60 pF capacitance avoids signal degradation at 480 Mbps; 43 V clamping prevents damage to 3.3 V PHY circuitry. |
Use Scenario: Safeguarding HDMI Display Data Channel (DDC) lines (SCL, SDA) from contact ESD in AV receivers and monitors. IC Role / Device Role: Dual-line ESD clamp referenced to local ground, preserving I²C timing margins. Use Value: Low leakage (<1 µA) prevents pull-up resistor loading; dual-cathode isolation avoids bus contention. |
| Industrial RS-485 Transceiver Protection | Automotive Body Control Module I/O |
Use Scenario: Shielding RS-485 differential pair (A, B) from induced surges in factory floor cabling and motor drive environments. IC Role / Device Role: Common-anode TVS array connected line-to-ground on each bus wire. Use Value: 5.0 A IPP and 300 W pulse rating handle repetitive 12 A lightning surges per IEC 61000-4-5. |
Use Scenario: Protecting LIN or CAN FD diagnostic pins and sensor inputs in body control modules exposed to ISO 10605 ESD. IC Role / Device Role: AEC-Q101 qualified dual-line protector for low-voltage automotive I/O with ground-referenced clamping. Use Value: −55 °C to +150 °C operating range supports under-hood deployment; UL 94 V-0 meets OEM flame-spread requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPD2E001DRYR (Texas Instruments) | Single-channel, 1.5 pF capacitance, 5.5 V VRWM - optimized for ultra-high-speed interfaces like USB 3.0, not 24 V lines. | Targeted at <6 V logic; unsuitable for 24 V industrial I/O or RS-485 where higher VRWM is mandatory. | Select only when protecting sub-5 V high-frequency signals where capacitance <2 pF is critical. |
| SMAJ24A (Littelfuse) | Single-line, 24 V unidirectional TVS, DO-214AC package - higher 400 W peak power but 3× larger footprint than SOT-23. | Requires two devices and more PCB area for dual-line protection; lacks integrated dual-cathode topology. | Choose when higher surge rating (>300 W) is required and board space allows DO-214AC placement. |
Compared with TPD2E001DRYR and SMAJ24A, the SM24T1G uniquely delivers dual-line 24 V protection in a space-constrained SOT-23 package while maintaining AEC-Q101 qualification and 60 pF capacitance - making it optimal for cost-sensitive, high-density industrial and automotive I/O designs where both voltage rating and footprint matter.
Availability
SM24T1G is available at Aetrix Electronics and suitable for USB 2.0 interface protection, industrial RS-485 transceiver safeguarding, and automotive body control module I/O requiring stable component supply across production lifecycles.
Supply support for SM24T1G 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, cloud, and IoT applications.
The SM24T1G belongs to the SM05T1G Series of ESD protection diode arrays, engineered specifically for compact, dual-line transient suppression in space-constrained, high-reliability electronic systems.
FAQ
What is the maximum clamping voltage of the SM24T1G under a 1 A transient pulse?
The SM24T1G has a maximum clamping voltage (VC) of 43 V when subjected to a 1 A peak pulse current with an 8/20 µs waveform. This value is measured per IEC 61000-4-5 test conditions and ensures protected circuits remain within safe voltage limits during ESD or surge events. The SM24T1G maintains this clamping performance across its full operating temperature range of −55 °C to +150 °C.
Is the SM24T1G suitable for protecting USB 2.0 data lines?
Yes, the SM24T1G is suitable for USB 2.0 data line protection due to its 60 pF typical capacitance at 0 V bias, which minimizes signal distortion at 480 Mbps data rates. Its dual-cathode configuration allows independent protection of D+ and D− lines using a single SOT-23 package, and its 43 V clamping voltage safeguards 3.3 V USB transceivers from ESD overstress. The SM24T1G's low leakage (<1 µA) also avoids interference with USB pull-up/pull-down resistors.
Does the SM24T1G meet automotive qualification standards?
Yes, the SM24T1G is AEC-Q101 qualified and PPAP capable, confirming its suitability for automotive applications including body control modules and infotainment I/O protection. It undergoes rigorous stress testing for temperature cycling, highly accelerated life testing (HALT), and ESD robustness per AEC-Q101 requirements. The "G" suffix indicates Pb-free construction aligned with automotive manufacturing standards, and its −55 °C to +150 °C junction temperature range supports under-hood and cabin deployment.
How is the pinout configured for dual-line protection in the SM24T1G?
The SM24T1G uses a common-anode configuration: Pin 1 is Cathode for Line 1, Pin 2 is Cathode for Line 2, and Pin 3 is the shared Anode connected to system ground. This arrangement enables independent clamping of two signal lines to the same reference without internal coupling. The SOT-23 package (Style 12) is clearly marked per the datasheet, and the pinout is validated in onsemi's mechanical drawings (Case 318) and electrical test reports.
What is the peak pulse power rating of the SM24T1G and under what test condition?
The SM24T1G has a peak pulse power rating of 300 W under an 8/20 µs current waveform at TL ≤ 25 °C, as defined in IEC 61000-4-5. This rating applies to each protected line independently and is verified per Figure 3 of the official datasheet. Derating is required above 25 °C ambient, with thermal resistance of 556 °C/W on FR-5 board and 417 °C/W on alumina substrate ensuring predictable power handling in real-world layouts.
SM24T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 2
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 43V
- Current - Peak Pulse (10/1000µs):
- 5A (8/20µs)
- Power - Peak Pulse:
- 300W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SM24T1G FAQ
1.How can I place an order for SM24T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SM24T1G 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 SM24T1G reliable?
The price and inventory of SM24T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM24T1G is usually 5 days.
3.What payment methods are accepted for SM24T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM24T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM24T1G?
SM24T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM24T1G 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 SM24T1G?
For technical support, including SM24T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM24T1G requirements.
6.How does Aetrix verify that SM24T1G is sourced from the original manufacturer or authorized distributors?
All SM24T1G 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 SM24T1G meets industry standards.
7.What is the process for return or replacement of SM24T1G?
All SM24T1G units undergo pre-shipment inspection (PSI). If there is an issue with SM24T1G, 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 SM24T1G part is unused and in its original packaging.
Return procedure for SM24T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM24T1G 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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D5V0H1B2LP-7B
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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