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onsemi SD12CT1
- Part No.:
- SD12CT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SD12CT1.pdf
- Description:
- TVS DIODE 12VWM 19VC SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:5,267
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Product details
Overview
SD12CT1 from onsemi is a bi-directional ESD protection diode designed for I/O line protection in portable electronics, featuring 12 V working peak reverse voltage (VRWM), 19 V clamping voltage at 5 A (VC), 15 A peak pulse current (IPP), and 64 pF capacitance at 0 V - deployed in cellular phones, digital cameras, and power supplies.
For engineers reviewing the SD12CT1 datasheet, pinout, applications, or equivalent options, key selection criteria include IEC61000-4-2 Level 4 compliance (±30 kV air/contact), ultra-low clamping performance, SOD-323 footprint constraints, and 12 V system-level DC operating margin.
Technical Context
This device operates as a transient voltage suppression (TVS) diode with symmetrical bi-directional clamping behavior, enabling protection of AC-coupled or differential signal lines without polarity concerns. Its 13.3 V breakdown voltage (VBR @ 1 mA) and 12 V VRWM ensure reliable standoff during normal operation while triggering fast response to ESD transients.
The SD12CT1 delivers 350 W peak power dissipation (8/20 µs waveform) with thermal resistance RJA = 635 °C/W and meets MSL 1 reflow requirements (260 °C, 10 s). It exhibits low leakage (1.0 µA @ 12 V) and stable clamping across temperature, supporting robust design in space-constrained portable applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 12 V - maximum continuous reverse voltage before clamping begins; matches common 12 V supply rails and USB/MIPI interface DC bias levels |
| VBR | 13.3 V min @ 1 mA - ensures precise, repeatable turn-on threshold for ESD events above normal operating range |
| VC @ IPP=5 A | 19 V - clamping voltage limits downstream IC stress during 8/20 µs ESD pulses, critical for protecting 3.3 V/5 V logic interfaces |
| IPP | 15 A - peak pulse current rating defines survivability under IEC61000-4-2 Level 4 contact discharge (±30 kV) |
| Cj @ 0 V | 64 pF - junction capacitance impacts high-speed signal integrity; suitable for <100 Mbps data lines (e.g., USB 2.0, UART) |
| IR @ VRWM | 1.0 µA - low leakage preserves battery life and avoids loading of high-impedance sensor or analog inputs |
| Package | SOD-323 - 1.70 × 1.25 × 0.85 mm surface-mount package enabling placement adjacent to connectors in tight PCB layouts |
Pinout & Package
SOD-323 two-terminal package with cathode band marking (Pin 1) and anode (Pin 2); no internal substrate connection or control pins - purely passive bi-directional clamping structure.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Cathode Band) | Bi-directional Anode/Cathode Junction Terminal | Marked terminal serves as either anode or cathode depending on transient polarity; enables symmetric clamping for AC signals |
| Pin 2 | Bi-directional Anode/Cathode Junction Terminal | Unmarked terminal completes the dual-junction TVS path; no polarity assignment required in layout |
Key Features
| Feature | Design Value |
|---|---|
| IEC61000-4-2 Level 4 Compliance | ±30 kV air/±30 kV contact discharge immunity - exceeds industrial and consumer ESD immunity requirements |
| Ultra-Low Clamping Voltage | 19 V @ 5 A - minimizes voltage overshoot on protected lines, reducing risk of latch-up or gate oxide damage in downstream ICs |
| Pb-Free & RoHS Compliant | Meets EU Directive 2011/65/EU - supports environmental compliance for global product certifications and end-of-life recycling |
| MSL 1 Reflow Rating | 260 °C peak, 10 s - compatible with standard lead-free reflow profiles without preconditioning or special handling |
Applications
| USB 2.0 Data Lines | Mobile Phone Keypad Interface |
|---|---|
Use Scenario: Protecting D+ and D− lines against ESD during cable insertion/removal in handheld devices. IC Role / Device Role / Timing Role: Bi-directional TVS diode placed directly at USB connector to clamp transients before reaching USB transceiver IC. Use Value: 19 V clamping ensures <5 V logic tolerance is not exceeded; 64 pF capacitance avoids signal rise-time degradation at 480 Mbps. | Use Scenario: Shielding mechanical keypad matrix rows/columns from user-hand ESD in smartphones and feature phones. IC Role / Device Role / Timing Role: Standalone ESD suppressor between keypad traces and microcontroller GPIO pins. Use Value: 12 V VRWM aligns with typical keypad I/O supply; low leakage (<1 µA) prevents false key detection during sleep mode. |
| Digital Camera Image Sensor Interface | DC-DC Converter Input Protection |
Use Scenario: Safeguarding MIPI CSI-2 clock and data lanes connecting image sensor to processor in compact camera modules. IC Role / Device Role / Timing Role: Passive clamping element mounted at sensor flex connector to absorb finger-touch ESD before signal conditioning circuitry. Use Value: SOD-323 size fits within 2 mm board edge clearance; 13.3 V VBR provides margin above 1.2 V/1.8 V rail voltages. | Use Scenario: Suppressing load-dump and coupling transients on 12 V input rails of buck converters in portable power supplies. IC Role / Device Role / Timing Role: Primary overvoltage clamp on converter input, placed upstream of input capacitor and controller IC. Use Value: 350 W peak power rating handles short-duration surges; 12 V VRWM avoids conduction during nominal 12 V 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 (onsemi) | 5.0 V VRWM, 12 V VC @ 1 A, 30 pF - lower clamping but narrower voltage range | Targeted at 3.3 V/5 V logic only; unsuitable for 12 V bus protection | Select when protecting sub-5 V interfaces where tighter clamping margin is prioritized over voltage range |
| SMAJ12A (Littelfuse) | 12 V VRWM, 19.9 V VC @ 10 A, 100 pF, DO-214AC package - higher capacitance, larger footprint | Used in industrial power supplies; less suitable for high-speed portable data lines | Choose for cost-sensitive 12 V rail protection where board space and signal speed are secondary |
Compared with ESD9B5.0ST5G and SMAJ12A, the SD12CT1 uniquely balances 12 V system compatibility, 19 V clamping headroom, 64 pF signal loading, and SOD-323 miniaturization - making it optimal for space-constrained, mixed-voltage portable designs requiring IEC61000-4-2 Level 4 immunity.
Availability
SD12CT1 is available at Aetrix Electronics and suitable for USB interface protection, mobile keypad ESD hardening, and digital camera sensor line safeguarding requiring stable component supply and full traceability.
Supply support for SD12CT1 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 portable markets.
The SD12CT1 belongs to onsemi's ESD protection diode product line, engineered specifically for ultra-compact, high-immunity transient suppression in battery-powered consumer electronics with strict board-area budgets.
FAQ
What is the maximum working voltage the SD12CT1 can protect?
The SD12CT1 has a working peak reverse voltage (VRWM) of 12 V, meaning it reliably blocks up to 12 V DC or continuous peak operating voltage without clamping. This makes SD12CT1 appropriate for protecting circuits powered by or interfacing with 12 V rails, such as USB power switches, DC-DC input stages, and automotive accessory interfaces - provided transient clamping thresholds remain within safe margins for downstream components.
Does the SD12CT1 require orientation during PCB placement?
No - the SD12CT1 is a bi-directional ESD protection diode with symmetrical clamping characteristics, so polarity does not affect its function. While the SOD-323 package features a cathode band marking (Pin 1), either orientation satisfies protection requirements for AC-coupled or bidirectional signal lines. However, consistent placement aids inspection and rework; SD12CT1 remains fully functional regardless of rotation.
How does the SD12CT1 compare to polymer-based ESD suppressors?
The SD12CT1 uses silicon avalanche diode technology, delivering faster response (<1 ns), lower clamping voltage (19 V @ 5 A), and tighter parameter distribution than polymer-based alternatives. Unlike polymer devices, SD12CT1 maintains stable performance over temperature and lifetime without degradation after repeated ESD strikes - critical for mission-critical portable electronics where long-term reliability is verified per IEC61000-4-2 Level 4 testing.
Is the SD12CT1 suitable for protecting high-speed data lines like USB 3.0 or HDMI?
No - the SD12CT1's 64 pF junction capacitance at 0 V is too high for USB 3.0 (requires <1.5 pF) or HDMI (typically <0.5 pF) interfaces. It is validated for USB 2.0, MIPI CSI-2, UART, and other sub-100 Mbps links where capacitance-induced signal distortion remains acceptable. For higher-speed protocols, onsemi offers specialized low-capacitance arrays such as ESD7L5.0DT5G, not the SD12CT1.
What reflow profile should be used for soldering the SD12CT1?
The SD12CT1 meets MSL 1 requirements and is rated for peak reflow temperatures up to 260 °C for 10 seconds, fully compatible with standard lead-free J-STD-020 profiles. No pre-baking is required. Its SOD-323 package (1.70 × 1.25 mm) demands precise stencil aperture design and controlled heating ramp rates to avoid tombstoning - confirmed process data for SD12CT1 is published in onsemi's BRD8011/D tape-and-reel specification document.
SD12CT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-76, SOD-323
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 12V (Max)
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19V
- Current - Peak Pulse (10/1000µs):
- 5A (8/20µs)
- Power - Peak Pulse:
- 350W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 64pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
SD12CT1 FAQ
1.How can I place an order for SD12CT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SD12CT1 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 SD12CT1 reliable?
The price and inventory of SD12CT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SD12CT1 is usually 5 days.
3.What payment methods are accepted for SD12CT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SD12CT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SD12CT1?
SD12CT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SD12CT1 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 SD12CT1?
For technical support, including SD12CT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SD12CT1 requirements.
6.How does Aetrix verify that SD12CT1 is sourced from the original manufacturer or authorized distributors?
All SD12CT1 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 SD12CT1 meets industry standards.
7.What is the process for return or replacement of SD12CT1?
All SD12CT1 units undergo pre-shipment inspection (PSI). If there is an issue with SD12CT1, 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 SD12CT1 part is unused and in its original packaging.
Return procedure for SD12CT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SD12CT1 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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