onsemi GF1K

Overview

GF1K from ON Semiconductor is a glass-passivated general-purpose silicon rectifier diode rated for 800 V maximum repetitive reverse voltage (V_RRM), 1.0 A average forward current (I_F(AV)), and 30 A non-repetitive surge current (I_FSM). It features low forward voltage drop (1.2 V @ 1.0 A), fast reverse recovery time (2.0 µs), and is packaged in SMA/DO-214AC for surface-mount power conversion applications.

For engineers reviewing the GF1K datasheet, pinout, applications, or equivalent options, key selection criteria include its 800 V blocking capability, thermal resistance (R_θJL = 26 °C/W), junction temperature range (–65 to +175 °C), and suitability for AC/DC adapters, power supplies, and input rectification stages where reliability under surge and elevated temperature is required.

Technical Context

The GF1K operates as a unidirectional power rectifier with a PN junction structure optimized for general-purpose switching and line-frequency rectification. Its glass passivation ensures stable performance and enhanced moisture resistance compared to epoxy-passivated alternatives.

Designed for PCB mounting on 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pads, it delivers 1.8 W power dissipation with R_θJA = 80 °C/W and R_θJL = 26 °C/W - enabling robust thermal management in compact power designs without forced cooling.

Key Specifications

Pinout & Package

Package: SMA/DO-214AC - surface-mount, molded plastic case with cathode indicated by color band; footprint compatible with JEDEC DO-214AC standard.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar general-purpose rectifier applications.

Compared with STTH1R08 and ES1J, the GF1K offers superior surge robustness (30 A I_FSM) and wider temperature tolerance (–65 to +175 °C), making it preferred for industrial-grade power supplies where reliability under transient stress outweighs marginal efficiency gains.

Availability

GF1K is available at Aetrix Electronics and suitable for AC/DC power adapters, industrial motor control inputs, and LED driver bulk rectification requiring stable component supply and long-term manufacturability.

Supply support for GF1K 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

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and logic solutions for automotive, industrial, cloud, and consumer markets.

The GF1K belongs to ON Semiconductor's general-purpose rectifier product line, designed for cost-effective, reliable AC/DC conversion in non-critical power applications where ruggedness and thermal stability are essential.

FAQ

What is the maximum junction temperature rating for the GF1K?

The GF1K has a specified operating junction temperature range of –65 to +175 °C. This wide range supports deployment in harsh environments such as industrial controls and outdoor power equipment. The device's thermal resistance values (R_θJL = 26 °C/W, R_θJA = 80 °C/W) allow accurate junction temperature estimation under real-world PCB layout conditions. Always verify thermal design using actual board copper area and ambient conditions for the GF1K.

Does the GF1K have a cathode marking, and how is it identified?

Yes, the GF1K uses a color band to denote the cathode terminal, consistent with the SMA/DO-214AC package standard. The band is typically a single stripe near one end of the molded body. This marking is critical for correct orientation during PCB assembly and ensures proper forward conduction direction. The anode is the unmarked terminal. Always confirm polarity with a multimeter diode test before high-volume placement of the GF1K.

Can the GF1K replace the 1N4007 in existing designs?

The GF1K is not a direct replacement for the 1N4007 due to differences in package (SMA vs. DO-41), V_RRM (800 V vs. 1000 V), and thermal characteristics. While both are general-purpose rectifiers, the GF1K's lower R_θJL (26 °C/W vs. ~50 °C/W for 1N4007) improves thermal performance, but its 800 V rating requires verification against peak line voltage in the target application. Redesign validation is recommended before substituting GF1K for 1N4007.

What is the reverse leakage current specification for the GF1K at elevated temperature?

The GF1K specifies reverse current (I_R) as 5.0 µA maximum at 25 °C and 50 µA maximum at 125 °C, measured at rated V_R. These values reflect stable leakage behavior across its operating range and are typical for glass-passivated silicon rectifiers. At 175 °C, leakage increases further but remains within safe operational limits for most power applications. Designers should account for this temperature-dependent leakage when sizing hold-up capacitors or evaluating standby power in GF1K-based circuits.

Is the GF1K suitable for use in automotive applications?

The GF1K is not AEC-Q101 qualified and is not recommended for automotive powertrain or safety-critical systems. However, it may be used in non-safety automotive auxiliary systems - such as cabin lighting or infotainment power supplies - provided the application remains outside AEC-Q101 scope and complies with OEM environmental and qualification requirements. For automotive-grade rectification, ON Semiconductor offers AEC-Q101-certified alternatives; the GF1K serves best in industrial and commercial power applications.