Alpha & Omega Semiconductor Inc. AOY66620

Overview

AOY66620 from Alpha & Omega Semiconductor is a 60V, 58A N-channel Trench Power MOSFET in TO-251B (IPAK short lead) package, featuring R_DS(ON) < 8.5 mΩ at V_GS = 10 V and optimized gate charge × R_DS(ON) figure-of-merit for high-efficiency synchronous rectification in ATX and gaming power supplies.

For engineers reviewing the AOY66620 datasheet, pinout, applications, or equivalent options, key selection criteria include its 100% UIS-tested ruggedness, low thermal resistance (R_θJC = 2.4 °C/W), and validated performance in high-current switching applications requiring stable conduction and fast turn-off.

Technical Context

The AOY66620 employs AlphaSGT™ technology to achieve low R_DS(ON) and high current density while maintaining robust avalanche capability (E_AS = 60 mJ). Its gate threshold voltage (2.4–3.6 V) ensures reliable enhancement-mode operation with standard 5 V or 10 V drive.

Dynamic parameters-including Q_g = 16–25 nC, Q_gd = 3.6 nC, and t_f = 5 ns-support high-frequency switching in SMPS topologies. The device is characterized for junction temperatures from –55 °C to 150 °C and features 100% R_g testing for gate reliability.

Key Specifications

Pinout & Package

TO-251B (IPAK short lead) package with three terminals: Drain (D), Source (S), and Gate (G). The package features exposed drain pad on bottom side for enhanced thermal conduction to PCB copper or heatsink.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IRFZ44NPBF and SiR626DP, the AOY66620 offers best-in-class thermal resistance (R_θJC = 2.4 °C/W) and ruggedness (100% UIS tested), making it optimal for high-reliability, high-current through-hole synchronous rectifiers where heatsink attachment and transient immunity are critical.

Availability

AOY66620 is available at Aetrix Electronics and suitable for ATX power supplies, gaming PSU secondary-side rectification, and industrial DC-DC modules requiring stable component supply and long-lifecycle availability.

Supply support for AOY66620 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

Alpha & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in high-performance MOSFETs, IGBTs, and power ICs for computing, consumer, and industrial markets.

The AOY66620 belongs to AOS' AlphaSGT™ Trench MOSFET product line, engineered specifically for high-efficiency, high-current synchronous rectification and switching applications in compact, thermally constrained power supplies.

FAQ

What is the maximum continuous drain current for AOY66620 at TC = 100°C?

The AOY66620 supports 58 A continuous drain current at T_C = 25°C, derating linearly to 37 A at T_C = 100°C per the Absolute Maximum Ratings table. This reflects thermal limits imposed by R_θJC = 2.4 °C/W and T_J(MAX) = 150°C. For sustained 58 A operation, active heatsinking or lower case temperature is required. The AOY66620 datasheet specifies this de-rating curve in Figure 13.

Does AOY66620 support logic-level gate drive?

The AOY66620 has a gate threshold voltage (V_GS(th)) of 2.4–3.6 V, enabling turn-on with 3.3 V or 5 V logic-level signals. However, full R_DS(ON) performance (<8.5 mΩ) requires V_GS ≥ 10 V. For logic-level applications, designers must verify sufficient gate drive strength to achieve full enhancement, as partial turn-on increases conduction loss. The AOY66620 transfer characteristics in Figure 2 confirm usable ID at V_GS = 4.5 V.

What is the body diode forward voltage of AOY66620 and how does it affect synchronous rectification?

The AOY66620 body diode exhibits V_SD = 0.7–1.0 V at I_S = 1 A and T_J = 25°C (Figure 6), significantly lower than Schottky diodes used in legacy designs. In synchronous rectification, this low V_SD minimizes reverse recovery loss during dead-time transitions. The AOY66620's Q_rr = 58 nC and t_rr = 18 ns further reduce switching loss compared to standard MOSFETs, enhancing overall converter efficiency.

Is AOY66620 suitable for unclamped inductive switching (UIS) applications?

Yes, the AOY66620 is 100% UIS tested with E_AS = 60 mJ at L = 0.3 mH, confirming robustness against inductive energy transients common in motor drives and relay drivers. This rating is measured per JEDEC JESD24-11 and guarantees safe operation without external snubbers in properly designed circuits. The AOY66620 UIS test circuit and waveform are documented in Figure C on page 6 of the datasheet.

What package type and mounting considerations apply to AOY66620?

The AOY66620 uses the TO-251B (IPAK short lead) package with an exposed drain pad on the bottom surface. This pad must be soldered to a large copper area or heatsink for effective thermal conduction-R_θJC = 2.4 °C/W assumes direct metal contact. Through-hole mounting provides mechanical stability in high-vibration environments, unlike surface-mount alternatives. The AOY66620 pinout diagram on page 1 shows G-D-S terminal arrangement for correct PCB layout.