SD12C-01FTG - 12V 450W Bidirectional TVS Diode | Littelfuse
料号： SD12C-01FTG ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.42 | $0.42 |
| 10 | $0.36 | $3.60 |
| 100 | $0.24 | $24.00 |
| 500 | $0.18 | $90.00 |
| 1,000 | $0.14 | $140.00 |
| 3,000 | $0.11 | $330.00 |
SD12C-01FTG 概述
What is a bidirectional TVS diode? A Transient Voltage Suppressor (TVS) is a solid-state protection device that clamps voltage spikes to a safe level when the input exceeds its breakdown threshold. Bidirectional means it protects both positive and negative transients symmetrically, eliminating polarity orientation concerns during PCB assembly. In the broader hierarchy, TVS diodes sit within surge protectors, which fall under Discrete Semiconductors > Diodes, providing the last line of defense for downstream ICs.
Key features include a 12V reverse standoff (Vrwm), 13.3V minimum breakdown (Vbr) and 450W peak pulse power (Ppp) on a 10/1000µs waveform. The SOD-323 (SC-76) footprint measures approximately 1.7mm x 1.25mm, enabling high-density placement on data line protection channels. The device offers low leakage current (<1µA at Vrwm) and a fast sub-nanosecond response time typical of avalanche-mode TVS technology.
The SD12C-01FTG uses avalanche breakdown physics in a silicon PN junction, achieving a sub-nanosecond clamping response that begins before the protected IC can latch up or fail. Compared with varistors, TVS diodes offer tighter clamping tolerances, lower capacitance, and no wear-out mechanism over rated surge events.
Typical applications include USB 2.0/3.0 data line protection, HDMI port ESD clamps, mobile handset charging port TVS, industrial CAN bus protection, and 12V automotive sensor interfaces. Its automotive-grade qualification makes it suitable for body electronics and infotainment links.
When designing with the SD12C-01FTG, route the protected trace directly through the device with the shortest possible ground return path to maximize surge absorption. Place the TVS within 3mm of the connector to minimize loop inductance, and pair it with a series ferrite or PTC for combined ESD + overcurrent defense.
This page synthesizes distributor pricing, drop-in alternatives, and practical layout notes not found in the manufacturer datasheet alone.
直接替换替代料： SD12C-01FTG ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： SD12C-01FTG （相同外形与封装尺寸） ——差异在于 Operating Temperature.
快速对比工具——选择替代料号进行并排对比：
SD12CWTG
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
SD05C-01FTG
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
NUP2105LT1G
✅ 直接替换📋 参考替代料（不在目录中）
ESD5V0S1B-N
✅ 直接替换📋 参考替代料（不在目录中）
SRV05-4.TCT
✅ 直接替换📋 参考替代料（不在目录中）
SD12C-01FTG 最大额定值与电气特性
| Series | SD-C (General Purpose) |
| Reverse Standoff Voltage (Vrwm) | 12 V |
| Breakdown Voltage (Vbr) Min | 13.3 V |
| Clamping Voltage (Vc) at 17A 8/20µs | 23 V |
| Peak Pulse Current (Ipp) 8/20µs | 17 A |
| Peak Pulse Power (Ppp) 10/1000µs | 450 W |
| ESD Contact Discharge | ±30 kV (IEC 61000-4-2) |
| ESD Air Discharge | ±30 kV (IEC 61000-4-2) |
| Surge Rating 8/20µs | 30 A (per IEC 61000-4-5 2nd Edition) |
| Direction | Bidirectional |
| 封装 | SOD-323 (SC-76) |
| 安装类型 | Surface Mount |
| 工作温度 | -40 °C to +125 °C |
| Automotive Qualified | Yes (AEC-Q101 grade SD12C-01FTG) |
| RoHS 状态 | Compliant |
SD12C-01FTG 引脚配置
| 引脚 1 | Pin 1 — Bidirectional TVS terminal (anode/cathode - non-polar) |
| 引脚 2 | Pin 2 — Bidirectional TVS terminal (cathode/anode - non-polar) |
Peak Pulse Power vs Pulse Duration
典型应用
SD12C-01FTG 适用于 6 应用s: USB 2.0/3.0 Data Line ESD Protection, HDMI / DisplayPort ESD Clamp, 12V Automotive CAN Bus Protection, Industrial Sensor I/O Protection, Mobile Handset Charging Port TVS, Industrial 12V Power Rail Transient Clamp.
USB 2.0/3.0 Data Line ESD Protection
The SD12C-01FTG protects USB D+/D- and VBUS lines from ±30kV contact ESD strikes per IEC 61000-4-2. Its 12V reverse standoff safely tolerates 5V VBUS transients without false clamping, and the bidirectional configuration eliminates polarity concerns during assembly. Place one TVS across each differential pair plus one on VBUS-to-GND, routed within 3mm of the USB connector to minimize loop inductance. The 23V clamp at 17A (8/20µs) keeps downstream USB transceiver ICs within their absolute-maximum ratings during cable discharge events. Sub-nanosecond response prevents latch-up in PHY chips. Suitable for USB Type-A, Type-C, and Micro-USB ports in consumer and industrial devices.
推荐
HDMI / DisplayPort ESD Clamp
The SD12C-01FTG can be deployed on HDMI TMDS lines and auxiliary channels for system-level ESD compliance. The 450W peak pulse power (10/1000µs) and 17A 8/20µs surge rating absorb cable discharge events that frequently occur during user plug-in. Bidirectional operation is essential for AC-coupled TMDS signals where polarity reference is dynamic. Place one TVS per TMDS lane plus dedicated clamps on the HPD and CEC lines. The IEC 61000-4-2 ±30kV rating exceeds HDMI CTS 1.4b ESD requirements, ensuring robust margin during compliance testing. Low leakage (<1µA at Vrwm) preserves signal integrity on hot-plug detect lines.
推荐
12V Automotive CAN Bus Protection
The SD12C-01FTG is AEC-Q101 qualified, making it ideal for automotive CAN-H/CAN-L bus protection in body electronics and infotainment modules. The 12V Vrwm aligns with 12V battery rail transients while clamping at 23V protects CAN transceivers (such as TJA1050 or TCAN334) from jump-start and load-dump surges. Bidirectional operation is critical for differential CAN signals. Place the TVS within 5mm of the bus connector with a direct ground return. The -40°C to +125°C operating range handles under-hood and cabin environments. IEC 61000-4-5 surge compliance covers automotive transient pulses per ISO 7637-2.
推荐
Industrial Sensor I/O Protection
Industrial 4-20mA loops, RS-485 interfaces, and 24V sensor rails benefit from SD12C-01FTG protection against surge events on long cable runs. The 12V Vrwm is well suited to 24V instrumentation loops where common-mode transients regularly exceed 30V. Place the TVS at the field-side connector with a series PTC or TVS for combined surge and overcurrent defense. The IEC 61000-4-5 30A surge rating covers induced lightning transients on outdoor cable runs. The compact SOD-323 footprint supports high-density multi-channel I/O modules. AEC-Q101 qualification, while automotive-targeted, also provides extended reliability margin in industrial applications.
推荐
Mobile Handset Charging Port TVS
The SD12C-01FTG can be deployed on the VBUS line of smartphone charging ports to absorb ESD during cable insertion and removal. The ±30kV contact rating handles real-world user discharge events, while the 23V clamp protects downstream charging ICs (such as BQ25890 or MAX77975) from induced surge. The SOD-323 footprint fits within the dense PCB layout of modern smartphones where board space is at a premium. Bidirectional operation eliminates polarity concerns during automated assembly. Sub-nanosecond response ensures the charging IC sees a clean VBUS rail even during fast ESD events. Low capacitance preserves USB PD signaling integrity.
推荐
Industrial 12V Power Rail Transient Clamp
The SD12C-01FTG provides final-line defense on 12V industrial power rails feeding PLCs, sensor hubs, and motor control boards. Place one TVS directly across the 12V-to-GND input terminal to absorb load-dump and inductive kickback surges from solenoids and motor brushes. The 450W peak pulse power rating handles repetitive inrush events that would otherwise stress downstream LDO regulators. Bidirectional operation handles both positive and negative transients common on ungrounded industrial systems. The -40 to +125°C operating range and AEC-Q101 qualification provide extended margin for harsh factory environments.
推荐
推荐产品汇总
工程参考数据： SD12C-01FTG ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | SD12CWTG | SD05C-01FTG | NUP2105LT1G | ESD5V0S1B-N | SRV05-4.TCT |
|---|---|---|---|---|---|---|
| Package | SOD-323 | SOD-323 - same | SOD-323 - same | SOD-323 - same | SOD-323 - same | SOT-23-6 - different |
| Brand | Littelfuse | Littelfuse | Littelfuse | onsemi | onsemi | Semtech |
| Reverse Standoff (Vrwm) | 12 V | 12 V | 5 V | 24 V | 5 V | 5 V |
| Clamping Voltage (Vc) | 23 V at 17 A | 23 V at 17 A | 9.8 V at 17 A | 44 V at 3 A | 12.5 V at 8 A | 12.5 V at 5 A |
| Peak Pulse Power (10/1000µs) | 450 W | 450 W | 450 W | 350 W | 100 W | 150 W |
| ESD Rating (Contact, IEC 61000-4-2) | ±30 kV | ±30 kV | ±30 kV | ±30 kV | ±30 kV | ±15 kV |
| Direction | Bidirectional | Bidirectional | Bidirectional | Bidirectional | Bidirectional | Bidirectional |
| Automotive Qualified (AEC-Q) | Yes (AEC-Q101) | Yes (AEC-Q101) | Yes (AEC-Q101) | Yes (AEC-Q101) | No | No |
| Unit Price (1k qty, USD) | $0.14 | $0.14 | $0.12 | $0.22 | $0.18 | $0.31 |
关键差异点
- Industry-leading ±30kV contact ESD rating （对比 SRV05-4.TCT)
- Higher peak pulse power (450W) （对比 NUP2105LT1G)
- AEC-Q101 automotive qualification （对比 ESD5V0S1B-N)
设计说明
Place the SD12C-01FTG within 3mm of the I/O connector with the shortest possible trace between the protected pin and ground. The loop inductance between the TVS, the protected trace, and ground determines the residual clamping voltage seen by downstream ICs during a fast ESD pulse. Use a wide ground pour (at least 0.5mm trace width per Ampere of expected surge) for the return path. Avoid routing protected and unprotected traces in parallel - keep them separated by a ground trace to prevent coupling.
For high-speed data lines (USB 2.0, HDMI), verify that the SD12C-01FTG capacitance is compatible with your signal-integrity budget. Typical TVS junction capacitance in the low-pF range preserves 480 Mbps USB and HDMI TMDS signals, but high-speed protocols (USB 3.0, USB 3.1 Gen 2) may require dedicated low-capacitance arrays. Estimated: TVS capacitance + connector stub + ESD footprint pad capacitance should total <2 pF for USB 2.0 Hi-Speed eye compliance.
While TVS diodes are not continuous-power devices, the SD12C-01FTG must dissipate 450W peak pulses without exceeding junction temperature limits. Derate repetitive surge events per the manufacturer derating curve: at 25°C the device can handle the full 450W pulse, but at 125°C ambient this drops significantly. For high-surge-count applications (e.g., hot-plug connectors), select a higher-rated TVS (e.g., 600W or 1500W series) to ensure long-term reliability.
Do not use the SD12C-01FTG on signal lines whose normal operating voltage exceeds 12V - the device will clamp the signal and corrupt data. For 24V rails, use a 24V Vrwm TVS instead. Do not rely on a single TVS for both ESD and surge protection on high-exposure connectors - pair with a gas discharge tube (GDT) for outdoor or long-cable applications. Always verify the part number suffix (-01FTG vs -01FLTG) matches the tape-and-reel orientation required by your pick-and-place.
合规信息
AEC-Q101 qualified (automotive-grade discrete semiconductor - note that AEC-Q101 applies to discretes, not AEC-Q100 which is for ICs). RoHS and REACH compliant per Littelfuse product page. Halogen-free per manufacturer declaration.
