SI3018-FT - 18V 12A 3mOhm eFuse | Silicon Labs
料号： SI3018-FT ✗ 停产SI3018-FT 概述
An eFuse is an integrated power-protection semiconductor that combines a current-limiting element with control and monitoring functions. In the broader hierarchy, an eFuse is a specialized load-switch and power-management IC rather than a conventional fuse or discrete MOSFET. This classification places the SI3018-FT in the integrated power-switching category, where the device is intended to protect a downstream rail by limiting current and reporting operating conditions. The IMON and PG features provide useful system-level observability for designs that need current feedback or a power-good indication.
The SI3018-FT’s 3 mOhm on-resistance is particularly relevant to power-conversion and telecom equipment because lower resistance can reduce conduction loss in the protected path. At the verified 12 A rating, an estimated 0.43 W conduction loss would result from the 3 mOhm resistance, before considering switching loss, thermal effects, or layout resistance. This estimate uses only the verified 12 A and 3 mOhm values and is not a datasheet specification. Actual allowable current and temperature rise must be confirmed against the manufacturer datasheet and PCB thermal conditions.
Typical application areas include telecom line-card power distribution, communications equipment, industrial modules, and compact embedded systems requiring a protected supply path. The 36-VQFN package can reduce board area compared with a discrete implementation, but it also requires careful exposed-pad layout, adequate copper area, and attention to thermal management. The SI3018-FT should therefore be selected after confirming the complete electrical limits, enable logic, fault behavior, and pin assignment in the manufacturer documentation.
This page consolidates the verified distributor references, the identified SI3018 family alternatives, and engineering guidance that helps distinguish the SI3018-FT from generic load switches. Because the supplied web data does not include a complete manufacturer datasheet, detailed pin-level, timing, and compliance parameters are explicitly marked as requiring verification rather than inferred.
直接替换替代料： SI3018-FT ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
该产品暂无直接替换替代料。
请求替代料SI3018-FT 最大额定值与电气特性
| Product Type | Integrated eFuse |
| Maximum Voltage | 18 V |
| Rated Current | 12 A |
| On-Resistance | 3 mOhm |
| Current Monitoring | IMON |
| Power-Good Signal | PG |
| 工作温度范围 | -40 C to +85 C |
| 封装 | 36-VQFN |
| 安装类型 | Surface Mount |
| Application Category | Telecom interface and power protection |
| Manufacturer | Silicon Labs |
| Output Protection Function | Electronic current limiting |
| 引脚数量 | 36 pins |
SI3018-FT 36-vqfn 引脚配置指南
SI3018-FT（36-vqfn 封装）的引脚配置。 该功率器件具有栅极、漏极和源极端子。对于无极性封装，请参阅制造商数据手册以了解确切的引脚 1 方向和封装尺寸细节。常见应用包括电源设计、电机驱动和负载开关。
暂无详细引脚数据： SI3018-FT.
请参阅 数据手册 以查看完整引脚配置。
典型应用
SI3018-FT 适用于 6 应用s: Telecom Power-Path Protection, Communications Equipment Supply Rail, Industrial Module Power Distribution, Protected 18 V Equipment Rail, High-Current Load Switch, Embedded System Power Sequencing.
Telecom Power-Path Protection
The SI3018-FT fits telecom equipment requiring a compact protected supply path because the verified specification identifies an 18 V rating, 12 A current capability, and 3 mOhm on-resistance. Its IMON output can provide current feedback to a line-card controller, while PG can participate in power sequencing or fault diagnostics. Used between an upstream 18 V-compatible supply and downstream circuitry, the part can limit fault current and reduce the area occupied by a discrete protection solution. The main design concern is thermal performance: estimated conduction loss at 12 A is 0.43 W using the verified resistance, so the 36-VQFN exposed pad and PCB copper must dissipate heat effectively. Complete fault timing and enable logic remain datasheet-dependent.
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Communications Equipment Supply Rail
The SI3018-FT is applicable to communications modules that require protection and observability in a compact surface-mount design. Its 12 A rating covers a relatively high-current distribution path, while 3 mOhm resistance limits the voltage drop generated by the protected path at rated current. The estimated drop from resistance alone is 36 mV at 12 A, calculated from the verified 3 mOhm specification. IMON supports load or fault monitoring, and PG can be used by system management logic to identify whether the downstream rail meets its acceptance criteria. Before implementation, verify the complete operating-voltage range, current-limit threshold, shutdown behavior, and exposed-pad thermal requirements in the manufacturer documentation.
推荐
Industrial Module Power Distribution
The SI3018-FT can support protected power distribution in compact industrial modules where available board area is constrained and current monitoring is useful. The 36-VQFN package integrates the switching and monitoring functions into a small surface-mount footprint, while the -40 C to +85 C verified operating range suits many commercial and industrial environments. A controller can use PG to validate the protected rail and IMON to observe operating current or detect abnormal conditions. Because the web data does not provide isolation, surge, or automotive qualification details, this use case should remain within the confirmed 18 V, 12 A, and 3 mOhm envelope until the full datasheet is reviewed.
推荐
Protected 18 V Equipment Rail
The SI3018-FT is suited to an 18 V equipment rail that benefits from integrated current limiting and status reporting. Placing the eFuse between the incoming supply and protected circuitry allows downstream loads to be isolated during an overcurrent condition, subject to the exact device behavior documented by the manufacturer. Its 3 mOhm resistance supports efficient conduction at currents up to the verified 12 A rating. IMON and PG improve system observability by providing analog monitoring and a discrete power-state indication. Layout must minimize high-current loop area, preserve thermal continuity beneath the exposed pad, and follow the manufacturer land pattern exactly.
推荐
High-Current Load Switch
The SI3018-FT can function as a monitored high-current load switch when a design needs controlled power-path behavior rather than only a mechanical connection. Its verified 12 A rating and 3 mOhm on-resistance provide a useful starting point for current and conduction-loss analysis, while IMON supports load-current observation. The integrated approach can reduce component count by combining switching, current measurement, and PG signaling in one 36-VQFN device. Engineering validation must still cover inrush behavior, short-circuit response, current-limit accuracy, and thermal derating because those values were not present in the supplied search results.
推荐
Embedded System Power Sequencing
The SI3018-FT can assist with power sequencing in embedded telecom or communications systems by combining a protected switching path with a PG output. The controller can treat PG as a state indication, while IMON supplies information about current conditions. The SI3018-FT's 18 V, 12 A, and 3 mOhm verified ratings make it appropriate for many 18 V-class distribution architectures, although the specific sequencing thresholds and signal timing must be confirmed from the datasheet. The 36-VQFN package also requires a careful exposed-pad footprint and adequate copper thermal design to avoid derating the device during sustained high-current operation.
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推荐产品汇总
工程参考数据： SI3018-FT ——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 |
|---|---|
| Product Type | Integrated eFuse |
| Maximum Voltage | 18 V |
| Rated Current | 12 A |
| On-Resistance | 3 mOhm |
| Current Monitoring | IMON |
| Power-Good Signal | PG |
| Operating Temperature Range | -40 C to +85 C |
| Package | 36-VQFN |
| Brand | Silicon Labs |
设计说明
Estimated: using the verified 12 A rating and 3 mOhm on-resistance, conduction loss is approximately 0.43 W before accounting for PCB and ambient effects. Confirm the package thermal resistance and current derating from the manufacturer datasheet. Provide uninterrupted ground-plane copper beneath the exposed pad and avoid thermal interruptions from dense signal routing. Validate the hottest expected operating condition rather than relying on ambient temperature alone.
Use the exact manufacturer land pattern for the 36-VQFN package; the supplied sources do not provide dimensions or an exposed-pad recommendation. Place input and output capacitors close to their associated pins to minimize high-current loop area. Route the power path with short, wide copper sections, and preserve the thermal pad connection specified in the datasheet. Do not infer a 20-pin QFN footprint from older SI3018 documentation.
Do not treat SI3018-F-FT or SI3018-GS as drop-in replacements without checking their package drawings, pin functions, voltage limits, current ratings, and fault timing. Search results contain mixed manufacturer attribution for SI3018-FT, so confirm the manufacturer, date code, and traceability before sourcing. Also do not infer current-limit, shutdown, or enable behavior from the presence of IMON and PG alone; those functions must be verified in the manufacturer datasheet.
合规信息
The supplied web results do not provide verified compliance statements for SI3018-FT. Values remain unknown pending manufacturer or distributor documentation.
