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onsemi SD12T1G
- Part No.:
- SD12T1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SD12T1G.pdf
- Description:
- TVS DIODE 12VWM 19VC SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:374,385
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Product details
Overview
SD12T1G from onsemi is a unidirectional ESD protection diode in SOD-323 package, rated for 12 V working peak reverse voltage (VRWM), 19 V clamping voltage at 5 A (VC), 150 pF capacitance at 0 V bias, 15 A maximum peak pulse current (IPP), and compliant with IEC61000-4-2 Level 4 (±15 kV air / ±8 kV contact). It protects USB 2.0 data lines in portable electronics.
For engineers reviewing the SD12T1G datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage under 5 A transient, low 150 pF signal-line capacitance, IEC61000-4-2/4-4/4-5 compliance, and SOD-323 footprint compatibility with space-constrained PCB layouts.
Technical Context
The SD12T1G is a unidirectional TVS diode optimized for electrostatic discharge suppression on low-voltage signal lines. Its breakdown voltage (VBR) is 13.3–15.75 V at 1 mA test current, and it delivers 19 V clamping at 5 A per IEC 61000-4-2 8/20 µs waveform - critical for preserving signal integrity in 3.3 V and 5 V interfaces.
It operates across −55 °C to +150 °C junction temperature, exhibits <1.0 µA reverse leakage at VRWM, and achieves thermal resistance of 416 °C/W (junction-to-ambient) on FR-4 board. The device meets AEC-Q101 requirements when ordered with SZ prefix, though SD12T1G itself is non-automotive grade.
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. |
| VC @ IPP = 5 A | 19 V - Clamped voltage during 8/20 µs ESD event; must stay below IC I/O absolute max rating. |
| IPP Max | 15 A - Peak pulse current handling capability per IEC 61000-4-2; defines surge robustness margin. |
| Capacitance @ 0 V | 150 pF - Signal-line loading effect on high-speed interfaces like USB 2.0 (480 Mbps); impacts rise time and jitter. |
| Leakage @ VRWM | <1.0 µA - Minimal DC power loss and noise injection into sensitive analog or RF paths. |
| ESD Rating | ±15 kV air / ±8 kV contact (IEC61000-4-2 Level 4) - Validates immunity to human-body and system-level ESD events. |
| Package | SOD-323 - 1.70 × 1.25 × 0.85 mm surface-mount outline; enables compact placement near connectors. |
Pinout & Package
SOD-323 package: two-terminal surface-mount device with cathode indicated by polarity band. Total weight 4.507 mg per unit. MSL 1 rated, compatible with 260 °C reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Protected line connection (anode grounded) | Provides unidirectional clamping path to ground; polarity band ensures correct orientation during placement. |
| Anode | Ground reference | Low-impedance return path for ESD current; must connect to clean, low-inductance system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| IEC61000-4-2 Level 4 compliance | Validated ±15 kV air / ±8 kV contact ESD immunity - eliminates need for external validation testing in end equipment. |
| 150 pF capacitance at 0 V | Enables use on USB 2.0 D+/D− lines without degrading eye diagram or bit error rate performance. |
| 19 V clamping at 5 A | Keeps downstream 3.3 V logic I/O within safe voltage margin (e.g., 3.3 V ±10 % = 3.63 V; clamping occurs only during transients). |
| 300 mW steady-state power rating | Supports continuous operation in always-on interfaces without thermal runaway under normal bias conditions. |
| Pb-free, RoHS-compliant construction | Meets global environmental regulations and enables direct integration into export-controlled medical and industrial products. |
Applications
| USB 2.0 Interface Protection | HDMI DDC Line Protection |
|---|---|
Use Scenario: Protecting differential data pairs (D+, D−) in portable USB peripherals against user-handling ESD events. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between each data line and ground, with cathode tied to signal line. Use Value: 150 pF capacitance avoids signal integrity degradation at 480 Mbps; 19 V clamping prevents latch-up in USB transceivers. | Use Scenario: Safeguarding HDMI Display Data Channel (DDC) clock and data lines (SCL/SDA) from hot-plug ESD. IC Role / Device Role / Timing Role: Low-capacitance unidirectional clamp on 5 V-tolerant I²C bus lines connected to display controller. Use Value: Sub-1 µA leakage preserves I²C pull-up efficiency; 12 V VRWM matches typical DDC line voltage swing. |
| Industrial Serial Port (RS-232/485) | Medical Sensor Interface |
Use Scenario: Adding secondary ESD protection on RS-232 TX/RX pins downstream of line driver ICs. IC Role / Device Role / Timing Role: Secondary clamping device on ±12 V signal lines, supplementing internal protection of transceiver ICs. Use Value: 15 A IPP rating handles induced surges from cable coupling; SOD-323 footprint fits tight connector zones. | Use Scenario: Shielding analog front-end inputs (e.g., ECG electrode leads) from operator touch ESD in Class II medical devices. IC Role / Device Role / Timing Role: First-stage transient suppressor before instrumentation amplifier input, referenced to isolated analog ground. Use Value: <1 µA leakage avoids DC offset errors; −55 °C to +150 °C rating supports sterilization and wide ambient operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ESD9B5.0ST5G | 5.0 V VRWM, 12 V VC @ 1 A, 30 pF capacitance - lower clamping but narrower voltage range. | Better suited for 3.3 V I/O rails; insufficient for 12 V signal lines like RS-232. | Select only if protecting sub-5.5 V interfaces where ultra-low capacitance is prioritized over voltage headroom. |
| SMF12CT1G | 12 V VRWM, 19.9 V VC @ 1 A, 200 pF capacitance - higher clamping and capacitance than SD12T1G. | Acceptable for lower-speed lines (e.g., UART), but marginal for USB 2.0 due to 200 pF loading. | Use when higher surge rating (200 W Ppk) is required and 200 pF capacitance is tolerable in layout. |
Compared with ESD9B5.0ST5G and SMF12CT1G, SD12T1G uniquely balances 12 V operating range, 19 V clamping at 5 A, and 150 pF capacitance - making it optimal for mid-speed digital interfaces requiring both voltage margin and signal fidelity.
Availability
SD12T1G is available at Aetrix Electronics and suitable for USB interface protection, industrial serial port hardening, and medical sensor front-end safeguarding requiring stable component supply and full traceability.
Supply support for SD12T1G 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 manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The SD12T1G belongs to the SDxxT1 series of unidirectional ESD protection diodes designed specifically for board-level transient suppression on high-density, space-constrained PCBs in consumer and industrial electronics.
FAQ
What is the clamping voltage of SD12T1G at 5 A transient current?
The SD12T1G has a specified clamping voltage (VC) of 19 V at 5 A peak pulse current under an 8/20 µs waveform per IEC 61000-4-2. This value is measured with the device mounted on an FR-4 board and ensures downstream 3.3 V or 5 V logic remains within safe operating limits during ESD events. The SD12T1G datasheet confirms this parameter in its Electrical Characteristics table.
Is SD12T1G suitable for USB 2.0 data line protection?
Yes, SD12T1G is suitable for USB 2.0 D+ and D− line protection due to its 150 pF capacitance at 0 V bias, which minimizes signal distortion at 480 Mbps data rates, and its 19 V clamping voltage that stays safely below typical USB transceiver absolute maximum ratings. Its SOD-323 footprint also allows placement directly adjacent to USB connectors - a key requirement validated in onsemi's application guidance for the SD12T1G.
Does SD12T1G meet automotive qualification standards?
No, SD12T1G does not meet automotive qualification standards. The SZSD12T1G variant - with SZ prefix - is AEC-Q101 qualified and PPAP capable, while SD12T1G is intended for commercial and industrial applications. The datasheet explicitly states "SZ Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements" and lists SD12T1G as non-SZ in the ordering table.
What is the maximum operating temperature range for SD12T1G?
The SD12T1G has a junction and storage temperature range of −55 °C to +150 °C, as confirmed in the Maximum Ratings table of its official datasheet. This wide range supports deployment in harsh environments such as industrial control cabinets, outdoor medical enclosures, and under-hood consumer accessories - provided PCB layout maintains adequate thermal dissipation per its 416 °C/W RJA rating.
Is SD12T1G still in active production?
No, SD12T1G is marked as discontinued in the official onsemi datasheet (Rev. 6, September 2025), with a note stating "DISCONTINUED (Note 1)" in the Ordering Information table. Customers requiring long-term supply should consult onsemi representatives for last-time-buy options or approved alternatives such as SMF12CT1G or next-generation equivalents documented in current onsemi product change notices.
SD12T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-76, SOD-323
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19V
- Current - Peak Pulse (10/1000µs):
- 15A (8/20µs)
- Power - Peak Pulse:
- 350W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 150pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
SD12T1G FAQ
1.How can I place an order for SD12T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SD12T1G 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 SD12T1G reliable?
The price and inventory of SD12T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SD12T1G is usually 5 days.
3.What payment methods are accepted for SD12T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SD12T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SD12T1G?
SD12T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SD12T1G 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 SD12T1G?
For technical support, including SD12T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SD12T1G requirements.
6.How does Aetrix verify that SD12T1G is sourced from the original manufacturer or authorized distributors?
All SD12T1G 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 SD12T1G meets industry standards.
7.What is the process for return or replacement of SD12T1G?
All SD12T1G units undergo pre-shipment inspection (PSI). If there is an issue with SD12T1G, 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 SD12T1G part is unused and in its original packaging.
Return procedure for SD12T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SD12T1G Tags
-
ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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