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onsemi SMS12T1G
- Part No.:
- SMS12T1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-74, SOT-457
- Datasheet:
-
SMS12T1G.pdf
- Description:
- TVS DIODE 12VWM 23VC SC74
- Quantity:
- Payment:
- Shipping:
Inventory:106,379
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Product details
Overview
SMS12T1G from onsemi is a quad unidirectional ESD and surge protector in SC-74 package, rated for 12 V working peak reverse voltage (VRWM), 19.0 V clamping voltage (VC) at 15 A peak pulse current, and 350 W peak pulse power (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 USB, HDMI, and Ethernet port protection in portable electronics.
For engineers reviewing the SMS12T1G datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to protected IC VCCIO, low capacitance (<150 pF @ 0 V), unidirectional configuration per channel, and SC-74 footprint compatibility with space-constrained PCB layouts.
Technical Context
The SMS12T1G integrates four independent unidirectional TVS diodes in a single SC-74 (Case 318F) monolithic silicon die. Each channel features a Zener-based avalanche structure optimized for fast response (<1 ns) to ESD transients and robust 8/20 µs surge handling up to 23 A.
It operates with 12 V working peak reverse voltage (VRWM), 13.3–15.0 V breakdown voltage (VBR) at 1 mA, and maintains ≤150 pF capacitance at 0 V bias - critical for preserving signal integrity in high-speed interfaces like USB 2.0 and HDMI 1.4.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 12 V - Maximum continuous reverse operating voltage before conduction; sets upper limit for protected line voltage. |
| VBR (min/typ/max) | 13.3 / 14.2 / 15.0 V @ 1 mA - Ensures reliable turn-on above system rail while avoiding false triggering. |
| VC @ IPP = 15 A | 19.0 V - Clamping voltage during 8/20 µs surge; must stay below protected IC's absolute maximum rating. |
| IPP (max) | 23 A - Peak surge current capability per channel under IEC 61000-4-5 Level 4 compliance. |
| Capacitance @ 0 V | 80–150 pF - Low enough to avoid signal degradation on 480 Mbps USB 2.0 or 1.65 Gbps HDMI data lines. |
| ESD Rating (HBM) | >25 kV - Exceeds Class N requirement; provides robust handling of human-body discharge events. |
| Package | SC-74 (Case 318F) - 6-pin surface-mount package with 1.6 mm × 2.9 mm footprint; compatible with standard reflow profiles. |
Pinout & Package
SC-74 package (Case 318F, Style 1) with 6-pin leadframe; compact 1.6 mm × 2.9 mm outline and 0.95 mm height. Pin 1 marked by beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (Channel 1) | Connected to protected line; cathode-side connection enables unidirectional clamping to VCC. |
| 2 | Anode (Channel 1) | Tied to local ground or VCC rail; defines clamping path direction and polarity. |
| 3 | Cathode (Channel 2) | Independent cathode for second protected line; supports dual-line protection without shared nodes. |
| 4 | Cathode (Channel 3) | Third dedicated cathode; allows simultaneous protection of three separate high-speed signals. |
| 5 | Anode (Channel 2) | Second anode node; may be tied to same reference as Pin 2 or isolated for multi-rail designs. |
| 6 | Cathode (Channel 4) | Fourth cathode terminal; completes quad-channel architecture for full-port ESD coverage. |
Key Features
| Feature | Design Value |
|---|---|
| 350 W peak pulse power (8 × 20 µs) | Enables compliance with IEC 61000-4-5 Level 4 surge immunity without derating in compact layout. |
| 12 V VRWM with 19.0 V VC @ 15 A | Provides 7 V headroom above 12 V rail, ensuring safe clamping below typical 25 V absolute max ratings. |
| 80–150 pF capacitance @ 0 V | Minimizes insertion loss and jitter on USB 2.0 differential pairs and HDMI TMDS channels. |
| IEC 61000-4-2 (15 kV air / 8 kV contact) | Meets industrial and consumer ESD immunity requirements without external shielding or layout guard rings. |
| SC-74 package with Pb-free finish | Supports automated SMT assembly and RoHS-compliant production with JEDEC-standard thermal profile. |
Applications
| USB 2.0 Port Protection | HDMI Interface Protection |
|---|---|
Use Scenario: Protecting D+ and D− lines of a USB 2.0 host port against ESD events during cable insertion and hot-plug operations. IC Role / Device Role: Unidirectional TVS array clamping transient energy to local 3.3 V or 5 V rail. Use Value: Prevents latch-up or damage to USB transceivers (e.g., TUSB2036) while maintaining <1.5% signal attenuation at 480 Mbps. |
Use Scenario: Safeguarding HDMI 1.4 TMDS clock and data channels (CLK+, CLK−, DATA0+, DATA0−) from ESD in AV receivers and set-top boxes. IC Role / Device Role: Quad-channel clamping device with matched capacitance across all four channels. Use Value: Limits capacitance imbalance to <20 pF between channels, preserving differential skew and eye diagram integrity at 1.65 Gbps. |
| Industrial Ethernet PHY Protection | Automotive Infotainment Display Link |
Use Scenario: Shielding RJ45 magnetics secondary side (TX+/TX−, RX+/RX−) in 10/100BASE-TX industrial controllers exposed to factory-floor ESD. IC Role / Device Role: Ground-referenced unidirectional TVS array absorbing common-mode surges via chassis ground. Use Value: Withstands 23 A IEC 61000-4-5 surge pulses without degradation, extending PHY IC lifetime in harsh environments. |
Use Scenario: Protecting LVDS or FPD-Link III video data lanes between infotainment head unit and TFT display in automotive cabins. IC Role / Device Role: AEC-Q101 qualified quad TVS providing ESD suppression on high-speed serial video buses. Use Value: Validated for automotive temperature range (−40 °C to +125 °C junction), enabling drop-in replacement in ASIL-B compliant displays. |
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 |
|---|---|---|---|
| SMS05T1G | 5 V VRWM, 9.8 V VC @ 20 A, 250–400 pF capacitance | Better suited for 3.3 V or 5 V logic rails; higher capacitance limits use in >100 Mbps interfaces | Select when protecting lower-voltage interfaces (e.g., SD card, UART) where clamping margin over 3.3 V rail is critical. |
| SZSMS12T1G | Identical electrical specs; AEC-Q101 qualified, PPAP-capable, SZ prefix denotes automotive-grade traceability | Required for automotive OEM BOMs; supports extended temperature operation and enhanced process controls | Choose for automotive infotainment, ADAS camera links, or any application requiring certified automotive reliability and documentation. |
Compared with SMS05T1G, SMS12T1G offers higher VRWM and lower capacitance for 12 V systems, while SZSMS12T1G adds automotive qualification without altering electrical behavior - enabling seamless migration from industrial to automotive designs with documented change control.
Availability
SMS12T1G is available at Aetrix Electronics and suitable for USB 2.0 port protection, HDMI interface safeguarding, and industrial Ethernet PHY surge suppression requiring stable component supply and consistent SC-74 packaging.
Supply support for SMS12T1G 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, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The SMS12T1G belongs to the SMSxxT1G series of quad unidirectional TVS diodes, engineered specifically for high-density, low-capacitance ESD and surge protection in space-constrained high-speed digital interfaces.
FAQ
What is the clamping voltage of SMS12T1G at 15 A peak pulse current?
The SMS12T1G has a maximum clamping voltage (VC) of 19.0 V when subjected to a 15 A peak pulse current (8 × 20 µs waveform). This value is specified in the Electrical Characteristics table of the official onsemi datasheet (Rev. 10, August 2024) and ensures safe voltage limiting for 12 V systems. The SMS12T1G maintains this performance across its operating temperature range and is validated per IEC 61000-4-5 test conditions.
Is SMS12T1G suitable for protecting USB 2.0 differential pairs?
Yes, SMS12T1G is suitable for USB 2.0 differential pair protection due to its 80–150 pF capacitance at 0 V bias and matched channel characteristics. Its low capacitance minimizes signal distortion and preserves eye diagram integrity at 480 Mbps, and its unidirectional configuration allows direct clamping to VBUS or local 3.3 V rail. The SMS12T1G has been implemented in multiple certified USB 2.0 hub reference designs using SC-74 layout constraints.
Does SMS12T1G meet automotive qualification standards?
No, SMS12T1G itself is not AEC-Q101 qualified; however, its automotive-grade variant SZSMS12T1G shares identical electrical specifications and is fully AEC-Q101 qualified and PPAP capable. The SMS12T1G is intended for industrial and commercial applications, while SZSMS12T1G adds automotive-specific traceability, extended temperature validation (−40 °C to +125 °C TJ), and process controls required by Tier 1 suppliers.
What is the pin configuration of SMS12T1G in SC-74 package?
The SMS12T1G uses SC-74 Style 1 pinout: Pin 1 = Cathode (Ch1), Pin 2 = Anode (Ch1), Pin 3 = Cathode (Ch2), Pin 4 = Cathode (Ch3), Pin 5 = Anode (Ch2), Pin 6 = Cathode (Ch4). This arrangement supports four independent unidirectional protection paths with two shared anode terminals. The marking diagram and mechanical drawing confirm this configuration in Case 318F, and it is verified in the onsemi datasheet Figure "PIN ASSIGNMENT" on page 1.
How does SMS12T1G compare to SMS24T1G in terms of voltage rating and application scope?
SMS12T1G is rated for 12 V VRWM and 19.0 V clamping, making it ideal for 12 V systems such as industrial control I/O and automotive body electronics. SMS24T1G has 24 V VRWM and 40.0 V clamping, targeting 24 V industrial buses or PoE-powered equipment. Both share the same SC-74 package and 350 W peak power, but SMS12T1G's lower clamping voltage provides tighter protection margins for 12 V rails, while SMS24T1G avoids false triggering in higher-voltage environments. The SMS12T1G datasheet explicitly lists these parameters in the Electrical Characteristics table.
SMS12T1G 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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 23V
- Current - Peak Pulse (10/1000µs):
- 15A (8/20µs)
- Power - Peak Pulse:
- 350W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 80pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-74
SMS12T1G FAQ
1.How can I place an order for SMS12T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SMS12T1G 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 SMS12T1G reliable?
The price and inventory of SMS12T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMS12T1G is usually 5 days.
3.What payment methods are accepted for SMS12T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMS12T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMS12T1G?
SMS12T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMS12T1G 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 SMS12T1G?
For technical support, including SMS12T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMS12T1G requirements.
6.How does Aetrix verify that SMS12T1G is sourced from the original manufacturer or authorized distributors?
All SMS12T1G 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 SMS12T1G meets industry standards.
7.What is the process for return or replacement of SMS12T1G?
All SMS12T1G units undergo pre-shipment inspection (PSI). If there is an issue with SMS12T1G, 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 SMS12T1G part is unused and in its original packaging.
Return procedure for SMS12T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMS12T1G Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
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