NCP398FCCT1G - USB Type-C VCONN OVP IC, 5.65V OVLO | onsemi
料号： NCP398FCCT1G ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.85 | $0.85 |
| 10 | $0.76 | $7.60 |
| 100 | $0.61 | $61.00 |
| 500 | $0.49 | $245.00 |
| 1,000 | $0.42 | $420.00 |
| 3,000 | $0.35 | $1,050.00 |
NCP398FCCT1G 概述
What is a VCONN OVP IC? A VCONN overvoltage protection IC is a specialized power-management device used in USB Type-C systems to safeguard the VCONN power rail that powers cable electronics (e-marked cables, retimers, and active cables). USB Type-C ports share connector pins between VBUS and the VCONN auxiliary supply, and a misconfigured cable or faulty adapter can inject the full VBUS voltage (5 V, 9 V, 15 V, or 20 V) onto the VCONN pin, instantly destroying the cable's electronic components. An OVP IC sits between the VCONN source and the cable, disconnecting the rail within microseconds whenever the detected voltage exceeds a safe threshold, typically an OVLO of 5.65 V for legacy cables or 3.65 V for modern USB PD 3.1 applications.
Key features include a 5.65 V OVLO threshold, internal MOSFET switch with low on-resistance, fast overvoltage response time in the microsecond range, built-in thermal shutdown, and an active-low ENB pin for system-level control. The WLCSP-4 (0.84x0.84 mm) package occupies minimal board area and is well-suited for compact mobile and wearable designs where PCB real estate is at a premium. The integrated protection reduces external component count and BOM cost relative to discrete FET + driver solutions.
The NCP398FCCT1G uses a back-to-back internal MOSFET topology that disconnects VCONN from the load during an overvoltage event while still allowing system-level monitoring through the OVLO logic. It is part of the onsemi NCP398 family, which is offered in UDFN and WLCSP packages to address different board layouts and thermal budgets.
Typical applications include USB Type-C ports in smartphones, tablets, laptops, docking stations, and wall adapters where VCONN rails must be defended against cable-borne overvoltage transients. The 5.65 V OVLO makes the part targeted at legacy 5 V VCONN implementations; designs targeting USB PD 3.1 cables (which can carry 9 V, 15 V, or 20 V VBUS) often require a higher-threshold variant or an additional external protection stage.
When designing with this device, place input/output capacitors adjacent to the WLCSP balls to minimize parasitic inductance, and follow IPC-7351 land pattern guidelines for wafer-level chip-scale packages to ensure reliable board-level reliability through thermal cycling and mechanical stress.
直接替换替代料： NCP398FCCT1G ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
NCP398FCBT1G
✅ 直接替换📋 参考替代料（不在目录中）
NCP398SQCT1G
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
NCP398FCCT1G 规格参数
| 功能 | USB Type-C VCONN overvoltage protection (OVP) IC |
| Overvoltage Lockout (OVLO) | 5.65 V |
| 封装 | WLCSP-4 (0.84 x 0.84 mm) |
| Enable Input | ENB (active-low) |
| Internal Switch | Back-to-back MOSFET |
| Thermal Protection | Thermal shutdown (built-in) |
| 工作温度 | -40 C to +85 C |
| Storage Temperature | -55 C to +150 C |
| 安装类型 | Surface Mount |
| 引脚数量 | 4 |
| RoHS 状态 | Compliant |
| Lead-Free | Yes |
| Applications | USB Type-C ports, smartphones, tablets, laptops, adapters |
| Manufacturer Family | NCP398 |
NCP398FCCT1G 引脚配置
| 引脚 A1 | IN — VCONN supply input from VBUS-derived source |
| 引脚 B1 | OUT — VCONN output to cable / load |
| 引脚 A2 | ENB — Active-low enable input (logic-low enables device) |
| 引脚 B2 | GND — Ground reference |
典型应用
NCP398FCCT1G 适用于 6 应用s: USB Type-C Smartphone VCONN Rail, USB Type-C Tablet and Laptop Docking Stations, USB Type-C Wall Adapters and Chargers, USB Type-C Active Cables and Retimers, USB Type-C Monitors and Display Dongles, Industrial USB Type-C Test and Measurement.
USB Type-C Smartphone VCONN Rail
The NCP398FCCT1G protects the VCONN rail of a smartphone's USB Type-C port from VBUS-to-VCONN overvoltage transients delivered by misbehaving cables or adapters. With a 5.65 V OVLO threshold and back-to-back MOSFET switch, it disconnects the cable electronics within microseconds when the cable injects higher-than-expected voltage. The 0.84x0.84 mm WLCSP-4 package fits within the tight confines of a mobile-phone PCB and saves roughly 6-8 mm of board area compared to discrete MOSFET-plus-comparator OVP solutions. Combined with ENB for system-level power-down during firmware updates, the part enables reliable legacy 5 V VCONN support without compromising protection.
推荐
USB Type-C Tablet and Laptop Docking Stations
In tablet and laptop docking stations, the NCP398FCCT1G guards the VCONN auxiliary rail that powers e-marked cables and active retimers within multi-port Type-C hubs. Because the docking station typically receives cables from many sources at once, the probability of a single misconfigured cable delivering 9 V or 20 V onto the VCONN rail is non-trivial. The NCP398's 5.65 V OVLO traps legacy 5 V VCONN faults cleanly while letting the system controller respond through ENB. The WLCSP-4 footprint allows the OVP IC to sit next to the Type-C connector, keeping loop inductance short and limiting transient overshoot.
推荐
USB Type-C Wall Adapters and Chargers
Wall adapters and travel chargers integrate the NCP398FCCT1G to protect downstream cable electronics when a legacy 5 V VCONN device is plugged into a USB PD 3.0 charger that briefly negotiates higher voltages. The IC's fast microsecond-class response time and 5.65 V OVLO threshold provide a clean disconnect before cable-rated VCONN components see an overvoltage. The active-low ENB pin allows the adapter's MCU to gate VCONN during standby, reducing idle power consumption. WLCSP-4 packaging helps the adapter meet tight regulatory enclosure volumes while simplifying thermal layout, since the back-to-back MOSFET integrates heat spreading into the die.
推荐
USB Type-C Active Cables and Retimers
Active USB Type-C cables contain retimer ICs and e-marker chips that draw a small current from VCONN, making them especially vulnerable to VBUS-to-VCONN shorts. The NCP398FCCT1G placed inside the cable overmold or active plug isolates the retimer from upstream overvoltage within microseconds, preserving the cable's higher-cost silicon. Its low on-resistance back-to-back MOSFET minimizes IR drop on the VCONN line so the cable negotiates properly even at the OVLO boundary. The WLCSP-4 package is small enough to fit within the cable plug's strain-relief boot, allowing field-replaceable cable designs.
推荐
USB Type-C Monitors and Display Dongles
USB Type-C monitors, dongles, and KVM switches use the NCP398FCCT1G to guard VCONN-fed display electronics from upstream VBUS overshoots that occur when the display is hot-plugged into a high-power laptop. The 5.65 V OVLO cleanly clips transients that exceed cable-class VCONN ratings while keeping the monitor operational under normal signaling. Engineers value the WLCSP-4 form factor because display-port PCBs are typically congested with high-speed lanes that leave little room for protection ICs. The thermal-shutdown feature prevents the OVP IC itself from overheating during sustained fault events.
推荐
Industrial USB Type-C Test and Measurement
Industrial USB Type-C testers and protocol analyzers benefit from the NCP398FCCT1G's predictable OVLO behavior to validate the cable's worst-case voltage-withstand capability. By forcing the ENB pin through an FPGA, the test fixture can stress VCONN with controlled fault timing and verify whether the cable's e-marker survives. The WLCSP-4 footprint integrates into a fine-pitch test fixture header, allowing repeatable contact during automated cable qualification. Because onsemi publishes thermal-shutdown thresholds clearly, the engineer can correlate fault durations with safe-recovery behavior.
推荐
推荐产品汇总
工程参考数据： NCP398FCCT1G ——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 | NCP398FCBT1G | NCP398SQCT1G |
|---|---|---|---|
| Package | WLCSP-4 (0.84x0.84 mm) | UDFN-6 (same family, different footprint - verify before drop-in) | WLCSP-4 (same family) |
| OVLO Threshold | 5.65 V | 5.65 V | 5.65 V |
| Brand | onsemi | onsemi | onsemi |
| Enable Logic | ENB active-low | ENB active-low | ENB active-low |
| Thermal Shutdown | Yes (built-in) | Yes (built-in) | Yes (built-in) |
| Internal Switch | Back-to-back MOSFET | Back-to-back MOSFET | Back-to-back MOSFET |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| RoHS | Compliant | Compliant | Compliant |
关键差异点
- WLCSP-4 sub-millimeter footprint （对比 NCP398FCBT1G (UDFN-6))
- Integrated back-to-back MOSFET （对比 Discrete FET + TL431 OVP circuit)
- onsemi direct-support lifecycle （对比 Third-party clone / relabel)
设计说明
WLCSP-4 packages rely on solder ball geometry and surface tension for self-alignment during reflow. Follow IPC-7351 WLCSP land-pattern guidance and use NSMD (non-solder-mask-defined) pads to maximize alignment tolerance. Place input/output capacitors adjacent to balls A1 and B1 to minimize parasitic inductance, which directly affects transient overshoot during VCONN hot-plug events.
Estimated: at a VBUS fault of 9 V on a 5 V VCONN line with cable capacitance of 10 uF, peak fault current through the back-to-back MOSFET can briefly exceed the IC's thermal-shutdown threshold if the OVP is not fast enough. The NCP398's microsecond-class response limits peak fault energy, but engineers should still validate that downstream cable electronics tolerate the residual transient. For USB PD 3.1 (9 V / 15 V / 20 V VBUS), add an external high-threshold protection stage or select a higher-OVLO variant.
Route the IN (A1) and OUT (B1) traces as a differential pair with a continuous ground return on the next PCB layer to control impedance and reduce radiated EMI. Keep the ENB (A2) trace short and away from high-speed USB 2.0 data lines to avoid logic glitches during VBUS plug events. Apply a 100 nF decoupling capacitor near ball B2 (GND) to filter high-frequency noise on the ground reference.
合规信息
RoHS and REACH compliant per onsemi product page; lead-free and halogen-free assembly materials are standard. Not AEC-Q100 qualified; for automotive applications choose a fully automotive-grade onsemi part. Conflict-minerals statement available on onsemi corporate-responsibility page.
