FDMC8030

The FDMC8030 is an N-channel enhancement mode power MOSFET from ON Semiconductor’s PowerTrench® family, designed for high-efficiency power switching applications in consumer, computing, and industrial electronics. PowerTrench technology is ON Semi’s advanced trench MOSFET architecture that delivers an optimized combination of low on-resistance (RDS(on)), low gate charge (Qg), low output capacitance (Coss), and fast switching speed — all critical parameters for achieving high efficiency in high-frequency power conversion. The FDMC8030 is rated for 30 V drain-source voltage and 11 A continuous drain current at 25°C, derated to 8.5 A at 100°C junction temperature. Its low on-resistance of 11 mΩ maximum at 10 V gate drive and 14 mΩ maximum at 4.5 V gate drive enables low conduction losses, while the low gate charge of 11 nC typical minimizes switching losses — an important balance for overall efficiency in DC-DC converter applications. The 4.5 V gate drive capability makes the device suitable for both 5 V and 12 V gate drive systems commonly found in computing and telecom power applications. The DFN-8 package (3.3 mm × 3.3 mm) provides an excellent combination of compact size and thermal performance. The exposed bottom pad of the DFN package provides a low thermal resistance path from the die to the PCB, enabling effective heat dissipation and allowing the device to handle its rated power in a small footprint. With 8 pins (multiple source and drain connections), the package also provides multiple parallel current paths for lower package resistance and improved current distribution. Key features include a fast body diode with low reverse recovery charge, which is important for synchronous rectifier and half-bridge applications where the body diode conducts during dead time. The device is fully characterized for both static and dynamic parameters including capacitances, gate charge characteristics, switching times, and safe operating area (SOA). With an operating temperature range of -55°C to +175°C and a high junction temperature rating of 175°C, the FDMC8030 provides substantial thermal headroom for demanding applications. RoHS compliant, lead-free, and halogen-free, it is packaged in tape and reel for high-volume automated assembly. Overall, the FDMC8030 is a versatile 30V N-channel MOSFET that finds application in DC-DC converters, load switches, battery management, motor drives, and power management circuits where high efficiency and small size are required.

The FDMC8030 is an N-channel enhancement mode MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) that operates as a voltage-controlled switch. In an N-channel MOSFET, current flows between the drain and source terminals through a channel of N-type semiconductor material, and the conductivity of this channel is controlled by the voltage applied to the gate terminal. The gate is electrically insulated from the channel by a thin layer of silicon dioxide (the ‘oxide’ in MOSFET), so the gate draws essentially zero DC current — only a small charging current when switching. In enhancement mode, the channel is normally non-conducting (off) when the gate-source voltage (VGS) is 0 V. When a positive VGS is applied that exceeds the gate threshold voltage (VGS(th), typically 1.5 V for FDMC8030), an electric field forms between the gate and the semiconductor, attracting electrons to the region under the gate oxide and creating a conductive N-type channel between the drain and source. The higher the VGS above threshold, the wider and more conductive the channel becomes, resulting in lower on-resistance (RDS(on)). ON Semiconductor’s PowerTrench technology uses a trench (vertical) gate structure rather than a planar (horizontal) structure. In the trench structure, the gate electrode is formed in a trench etched vertically into the silicon, with the gate oxide lining the trench walls. This vertical structure has several advantages: the channel is formed along the vertical trench walls, which increases the effective channel width per unit of die area (reducing RDS(on) for a given die size); the gate-to-drain overlap capacitance (Crss) is reduced, improving switching speed and reducing switching losses; and the overall die can be smaller for a given RDS(on) rating, reducing cost. When the MOSFET is fully on (saturated, with VGS well above threshold), it behaves like a low-value resistor (RDS(on)), and power dissipation is I² × RDS(on). This is the conduction loss. When switching between on and off states, energy is dissipated as the voltage and current transition — these are the switching losses, which depend on gate charge, output capacitance, and switching frequency. The FDMC8030’s low gate charge and low output capacitance minimize these switching losses, which is particularly important in high-frequency DC-DC converter applications. The body diode (also called the parasitic diode or intrinsic diode) is formed by the body-drain PN junction inherent in the MOSFET structure. It conducts when the drain-source voltage goes negative (for an N-channel device), and its characteristics are important in synchronous rectifier and bridge applications where the body diode carries current during dead time. The fast body diode of the FDMC8030 reduces losses in these applications. Overall, the PowerTrench architecture provides an optimal balance of low conduction loss, low switching loss, and high power density.

The FDMC8030 is an N-channel power MOSFET in an 8-pin DFN (Dual Flat No-lead) surface-mount package with exposed thermal pad.

Note: In typical DFN-8 power MOSFET pinouts, one side contains the gate pin(s), the opposite side contains multiple drain pins, and the large exposed bottom pad serves as both the source connection and the primary thermal path. Exact pin assignments should be verified against the official datasheet.

Package Features:

• Package Style: DFN-8 (Dual Flat No-lead, 8 connections)
• Package Dimensions: 3.3 mm × 3.3 mm × 0.8 mm (approximate)
• Exposed Thermal Pad: Yes (large bottom pad for heat dissipation)
• Termination: Tin-plated, lead-free
• Mounting: Surface mount technology (SMT)
• Thermal Resistance (Junction to Case): ~4°C/W (excellent thermal performance)
• Current Handling: Multiple drain and source connections for low resistance
• Packaging: Tape and reel (standard for SMT assembly)
• Weight: Lightweight
• RoHS Compliant: Yes
• Halogen Free: Yes

Application Notes:

• Use wide copper traces on drain and source for low resistance and good heat spreading
• Maximize copper area on the source pad for thermal dissipation
• Place gate resistor close to the gate pin for damping and noise immunity
• Ensure adequate PCB thermal vias under the exposed pad
• Refer to the ON Semiconductor FDMC8030 datasheet for exact pinout, dimensions, recommended PCB footprint, and thermal design guidelines

• DC-DC Converters: Used as the control switch or synchronous rectifier in buck, boost, buck-boost, and other DC-DC converter topologies in computing, telecom, and consumer electronics, where the low RDS(on) and low gate charge combine for high efficiency across light and heavy load conditions
• Load Switches & Power Distribution: Deployed as high-side or low-side load switches in portable electronics, servers, and communication equipment for power distribution, enabling and disabling power rails to subsystems, and providing protection features like current limiting and voltage monitoring
• Battery Management Systems (BMS): Used in battery management systems for Li-ion battery packs (laptops, power tools, e-bikes, EV modules) as discharge/control FETs, cell balancing switches, and protection circuit switches, leveraging the 30V rating for multi-cell battery stacks
• Motor Drives & Motor Control: Found in BLDC and brushed DC motor drive circuits for power tools, robotics, drones, and automotive actuators, where high current capability and efficient switching contribute to extended battery life and high performance
• Power Management IC Companions: Used alongside power management ICs (PMICs) as external pass transistors for high-current power rails, or as additional switching regulators controlled by the PMIC’s PWM outputs
• Portable Electronics & Computing: Used in laptops, tablets, smartphones (high-power variants), wearables, and accessories for efficient power conversion, battery charging, and power management in space-constrained designs where the small DFN-8 package is essential
• LED Drivers & Lighting: Deployed in LED driver circuits for general lighting, automotive lighting, and display backlighting as the switching element in buck, boost, and buck-boost LED driver topologies, providing efficient constant-current drive for LED arrays
• Server & Telecom Power: Used in server power supplies, telecom rectifiers, and datacom equipment for intermediate bus converters, point-of-load regulators, and power OR-ing applications where efficiency and power density are critical design requirements