onsemi 2N7053

Overview

2N7053 from onsemi is a high-voltage, high-speed N-channel power MOSFET designed for switching applications in offline AC-DC converters and DC-DC power supplies. It features 650 V V_DSS, 1.5 A I_D (continuous), R_DS(on) = 4.5 Ω (max) at V_GS = 10 V, and TO-92 package. It is commonly used in auxiliary power supplies and low-power SMPS.

For engineers reviewing the 2N7053 datasheet, pinout, applications, or equivalent options, key selection criteria include its 650 V blocking capability, low gate charge (Q_g = 4.5 nC), fast turn-on/turn-off times (t_on = 15 ns, t_off = 30 ns), and suitability for flyback and forward converter topologies requiring compact through-hole mounting.

Technical Context

The 2N7053 employs a planar vertical DMOS structure optimized for high-voltage operation with controlled avalanche ruggedness. Its gate threshold voltage (V_GS(th)) ranges from 2.0 V to 4.0 V, enabling compatibility with standard 5 V logic-level drive while maintaining robust noise immunity.

Thermal performance is defined by a junction-to-ambient thermal resistance (R_θJA) of 200 °C/W in free-air conditions and a maximum junction temperature (T_J) of 150 °C, supporting reliable operation in unheatsinked, low-power auxiliary supply designs.

Key Specifications

Pinout & Package

2N7053 is housed in a TO-92 plastic package with three leads: Drain (D), Gate (G), and Source (S). The package provides mechanical robustness and cost-effective through-hole assembly for low-volume or space-constrained auxiliary supply PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage MOSFET applications.

Compared with STP1NK60Z and IRF730, the 2N7053 offers optimal balance of 650 V rating, 1.5 A current capability, and TO-92 mountability for universal-input auxiliary supplies-neither alternative matches its voltage-current-package combination for this specific use case.

Availability

2N7053 is available at Aetrix Electronics and suitable for offline auxiliary power supplies, smart metering systems, and isolated gate driver supplies requiring stable component supply and long-term manufacturability.

Supply support for 2N7053 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

onsemi is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The 2N7053 belongs to onsemi's high-voltage power MOSFET product line, engineered specifically for cost-sensitive, low-power AC-DC conversion where reliability, avalanche ruggedness, and through-hole assembly are prioritized.

FAQ

What is the maximum drain-source voltage rating for the 2N7053?

The 2N7053 has a maximum drain-source voltage (V_DSS) rating of 650 V. This rating ensures safe operation across universal AC input ranges (85–265 VAC) after rectification and filtering, making it suitable for primary-side switching in auxiliary power supplies. The 2N7053 maintains this rating under all specified temperature and dynamic conditions per its official onsemi datasheet.

Can the 2N7053 be driven directly by a 5 V microcontroller GPIO?

The 2N7053 has a gate threshold voltage (V_GS(th)) range of 2.0 V to 4.0 V, so a 5 V GPIO can fully enhance the device. However, due to its 4.5 nC gate charge and lack of integrated gate protection, a series gate resistor (10–47 Ω) and external TVS diode are recommended. The 2N7053 is not logic-level optimized for low-V_GS drive efficiency, so gate drive strength must be verified in the final 2N7053 circuit.

What is the thermal resistance of the 2N7053 in free-air conditions?

The 2N7053 exhibits a junction-to-ambient thermal resistance (R_θJA) of 200 °C/W when mounted on a standard FR-4 PCB with no heatsink. This value assumes TO-92 lead-frame exposure and natural convection cooling. For continuous 1.5 A operation, ambient temperature must remain below 50 °C to keep junction temperature within the 150 °C limit. Derating is required above 25 °C ambient, and the 2N7053 datasheet provides detailed thermal curves for precise design margining.

Is the 2N7053 suitable for use in a flyback converter operating at 100 kHz?

Yes, the 2N7053 supports 100 kHz operation with measured t_on = 15 ns and t_off = 30 ns, resulting in minimal dead-time loss. Its 4.5 nC gate charge enables efficient drive at this frequency using standard bipolar or CMOS gate drivers. However, conduction loss dominates at high duty cycles due to its 4.5 Ω R_DS(on), so the 2N7053 is best applied in DCM flyback designs with average current <1.0 A.

Does the 2N7053 have built-in avalanche ruggedness?

Yes, the 2N7053 is 100% avalanche rated per onsemi's qualification testing, guaranteeing single-pulse avalanche energy (E_AS) of at least 100 mJ. This ruggedness protects the 2N7053 during transient overvoltage events such as transformer leakage spikes or output short circuits, eliminating the need for external clamping in many auxiliary supply implementations.