Taiwan Semiconductor Corporation SF2L8G

Overview

SF2L8G from Taiwan Semiconductor is a 2 A, 600 V super fast recovery rectifier diode in DO-204AC (DO-15) package, featuring 1.70 V max forward voltage at 2 A and 35 ns reverse recovery time. It delivers high surge current capability (IFSM = 40 A), low power loss, and is optimized for switching-mode power supplies and freewheeling paths in industrial DC-DC converters.

For engineers reviewing the SF2L8G datasheet, SF2L8G pinout, SF2L8G application, or SF2L8G equivalent, key selection criteria include its 600 V repetitive peak reverse voltage, 40 A surge rating, thermal resistance (R_θJL = 17 °C/W), AEC-Q101 qualification option (SF2L8GH), and DO-15 mechanical compatibility with legacy through-hole layouts.

Technical Context

The SF2L8G uses a single-die, glass-passivated silicon junction to achieve fast recovery (trr ≤ 35 ns) and low leakage (IR ≤ 1 µA at 25°C). Its 600 V V_RRM and 420 V V_R(RMS) support high-input-voltage topologies, while R_θJA = 65 °C/W enables operation up to T_J = 150°C without forced cooling in moderate-power designs.

Designed for unidirectional conduction in hard-switched circuits, the SF2L8G exhibits 20 pF junction capacitance at 4 V reverse bias and maintains stable VF across temperature - critical for efficiency-critical flyback and boost converter outputs where conduction loss dominates.

Key Specifications

Pinout & Package

Package: DO-204AC (DO-15), axial lead, glass-passivated die, cathode indicated by band. Lead finish: pure tin, J-STD-002 solderable. Weight: 0.400 g.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar super fast rectifier applications.

Compared with STTH2R06 and ES2D, the SF2L8G uniquely combines 600 V rating, AEC-Q101 availability, and 17 °C/W junction-to-lead thermal resistance - making it optimal for space-constrained, thermally demanding, and automotive-qualified 2 A rectification tasks.

Availability

SF2L8G is available at Aetrix Electronics and suitable for DC-DC converters, switching mode inverters, and freewheeling applications requiring stable component supply, consistent DO-15 mechanical fit, and verified 600 V/2 A performance.

Supply support for SF2L8G 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving industrial, computing, and automotive markets since 1979.

The SF2L8G belongs to TSC's Super Fast Rectifier family, engineered specifically for high-efficiency, high-reliability power conversion in compact through-hole packages - emphasizing low VF, fast trr, and rugged thermal performance.

FAQ

What is the maximum junction temperature rating for the SF2L8G?

The SF2L8G has a maximum junction temperature (T_J) rating of +150°C, validated across its full operating range from –55°C to +150°C. This allows reliable operation in high-ambient environments such as enclosed power supplies or under-hood automotive locations when paired with appropriate PCB copper area for heat dissipation. The SF2L8G maintains specified electrical parameters within this range.

Is the SF2L8G pin-compatible with other DO-15 rectifiers like the 1N4007?

Yes, the SF2L8G uses the standard DO-204AC (DO-15) axial package with identical mechanical dimensions and lead spacing as the 1N4007, enabling direct physical replacement on existing PCBs. However, unlike the 1N4007's 30 µs recovery time and 1 A rating, the SF2L8G offers 35 ns trr and 2 A continuous current - requiring verification of layout thermal relief and switching frequency compatibility.

Does the SF2L8G meet automotive qualification standards?

The base SF2L8G is not AEC-Q101 qualified, but Taiwan Semiconductor offers the SF2L8GH variant - identical electrically and mechanically but fully tested and certified to AEC-Q101 for stress, temperature cycling, and reliability. For automotive applications, specify SF2L8GH; the "H" suffix denotes AEC-Q101 compliance, and both share the same SF2L8G marking code on the device body.

What is the typical forward voltage drop of the SF2L8G at 2 A and 125°C?

While the datasheet specifies V_F ≤ 1.70 V at 2 A and 25°C, the SF2L8G exhibits positive temperature coefficient behavior: V_F decreases slightly with rising junction temperature. At 125°C and 2 A, typical V_F is approximately 1.55 V - confirmed by Figure 4 (Typical Forward Characteristics) in the B2105 datasheet. This improves conduction efficiency at elevated temperatures.

How does the SF2L8G's junction capacitance affect EMI in high-frequency SMPS designs?

The SF2L8G has a typical junction capacitance (C_J) of 20 pF at 4 V reverse bias, measured at 1 MHz. This low value minimizes displacement current during rapid voltage transitions, reducing high-frequency common-mode noise injection into transformer windings and output filters. In 300–500 kHz flyback converters, this contributes to cleaner output ripple and easier EMI filter sizing compared to diodes with >50 pF C_J.