STMicroelectronics STL35N6F3

Overview

STL35N6F3 from STMicroelectronics is an N-channel enhancement-mode Power MOSFET in PowerFLAT™ 5x6 package, rated for 60 V V_DS, 0.019 Ω R_DS(on) at V_GS = 10 V and 10 A continuous drain current (T_pcb = 25 °C), featuring low gate charge (13.6 nC) and 100% avalanche-rated operation. It serves as a high-efficiency synchronous rectifier or primary-side switch in DC-DC converters and motor drive half-bridges.

For engineers reviewing the STL35N6F3 datasheet, STL35N6F3 pinout, STL35N6F3 application, or STL35N6F3 equivalent, key selection criteria include its 31.3 °C/W junction-to-PCB thermal resistance, 409 mJ single-pulse avalanche energy, 762 pF input capacitance, and compatibility with 4.7 Ω gate drive in fast-switching topologies.

Technical Context

This MOSFET employs STMicroelectronics' STripFET™ III process to simultaneously minimize R_DS(on) and gate charge-enabling high-frequency switching with reduced conduction and switching losses. Its PowerFLAT™ 5x6 package provides exposed-drain thermal pad for direct PCB heat sinking and supports surface-mount reflow assembly.

The device operates with a gate threshold voltage of 2–4 V and exhibits stable on-resistance over temperature (1.8× increase from −75 °C to 150 °C). Its source-drain diode has 33 ns reverse recovery time and 51.2 nC reverse recovery charge under 100 A/µs di/dt, enabling use in synchronous rectification without external Schottky replacement.

Key Specifications

Pinout & Package

STL35N6F3 uses the PowerFLAT™ 5x6 (Type C-B) package: 5 mm × 6 mm footprint, 0.83 mm nominal height, exposed drain pad on bottom for thermal conduction. Pin 1 is marked by chamfered corner; pins are arranged linearly along one long edge.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel 60 V power MOSFET applications.

Compared with BSC014N06LS3 and SiHFL064, STL35N6F3 offers balanced trade-offs: moderate R_DS(on) and Q_g, industry-leading avalanche ruggedness, and compact PowerFLAT™ 5x6 thermal performance-making it optimal for cost-sensitive, reliability-critical industrial switching.

Availability

STL35N6F3 is available at Aetrix Electronics and suitable for battery-powered motor drives, DC-DC synchronous rectifiers, and industrial PLC output modules requiring stable component supply across multi-year production cycles.

Supply support for STL35N6F3 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

STL35N6F3 belongs to the STripFET™ III Power MOSFET product line, engineered specifically to deliver ultra-low R_DS(on) and gate charge for high-efficiency, high-frequency power conversion in space-constrained applications.

FAQ

What is the maximum continuous drain current for STL35N6F3 at PCB temperature of 100 °C?

The STL35N6F3 supports 7 A continuous drain current when mounted on a standard FR-4 PCB at 100 °C ambient (T_pcb = 100 °C), per Table 2 in the official datasheet. This rating reflects thermal limitation imposed by its 31.3 °C/W junction-to-PCB resistance and 175 °C maximum junction temperature.

Does STL35N6F3 require a gate resistor for reliable operation?

Yes-a gate resistor is required to control dV/dt and prevent oscillation during switching. The datasheet specifies test conditions using a 4.7 Ω resistor (Figure 12); typical design values range from 2.2 Ω to 10 Ω depending on switching speed and EMI requirements. Omitting it risks shoot-through in bridge configurations.

Can STL35N6F3 be used in linear (analog) regulation mode?

No-it is not characterized or guaranteed for linear-mode operation. Its Safe Operating Area (Figure 2) shows limited capability beyond pulse widths of 10 ms at high V_DS/I_D combinations. For analog regulation, ST recommends dedicated LDOs or bipolar linear regulators instead.

Is the exposed drain pad on the PowerFLAT™ 5x6 package electrically connected to the drain terminal?

Yes-the exposed copper pad on the bottom of the PowerFLAT™ 5x6 package is internally connected to the drain (Pin 3) and must be soldered to a large PCB copper pour for thermal and electrical performance. Electrical isolation of this pad violates the device's thermal specification and may cause premature failure.