Taiwan Semiconductor Corporation 1N5817

Overview

1N5817 from Taiwan Semiconductor is a 1A, 20V Schottky barrier rectifier in DO-41 package, featuring 0.45V max forward voltage at 1A and 30A surge capability. It serves as a low-loss output rectifier in DC-DC converters and AC adapters where fast switching and thermal efficiency are critical.

For engineers reviewing the 1N5817 datasheet, 1N5817 pinout, 1N5817 application, or 1N5817 equivalent, key selection factors include its 20V V_RRM, 100°C/W R_θJA, AEC-Q101 qualification option, DO-41 mechanical compatibility, and 1mA reverse leakage at 25°C.

Technical Context

This discrete Schottky diode uses a single-die construction with guard ring protection to sustain transient overvoltage events. Its low V_F and high I_FSM enable efficient power conversion in compact, thermally constrained topologies.

The device operates across –55°C to +125°C junction temperature range and exhibits 55pF junction capacitance at 4V reverse bias-critical for high-frequency switching noise control and EMI management in SMPS designs.

Key Specifications

Pinout & Package

Package: DO-204AL (DO-41), axial-leaded, epoxy-molded case with cathode band polarity marking. Leads are pure tin-plated and solderable per J-STD-002.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SB120 and SS12, the 1N5817 delivers the lowest forward voltage in its voltage class and supports through-hole manufacturing while offering AEC-Q101-qualified variants-making it optimal for cost-efficient, thermally stable, and automotive-capable rectification where leaded packaging is preferred.

Availability

1N5817 is available at Aetrix Electronics and suitable for switching mode power supplies, AC/DC adapters, and DC-DC converters requiring stable component supply, long-term BOM continuity, and RoHS-compliant sourcing.

Supply support for 1N5817 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 consumer markets since 1979.

The 1N5817 belongs to TSC's general-purpose Schottky rectifier product line, engineered for high-efficiency, low-noise power conversion in cost-sensitive, high-volume applications such as consumer adapters and embedded power rails.

FAQ

What is the maximum junction temperature rating for the 1N5817?

The 1N5817 has a maximum junction temperature (T_J) of +125°C and a minimum of –55°C. This rating allows reliable operation in industrial environments where ambient temperatures reach 85°C, provided thermal design maintains junction temperature within limits using the specified R_θJA = 100°C/W. The 1N5817 must not be operated beyond this limit to avoid permanent degradation.

Does the 1N5817 have AEC-Q101 qualification?

The base 1N5817 is not AEC-Q101 qualified, but Taiwan Semiconductor offers an AEC-Q101-qualified version identified by the "H" suffix (e.g., 1N5817H). This variant undergoes stress testing per automotive reliability standards and is intended for use in vehicle infotainment, body control, and ADAS auxiliary power systems. Always verify ordering code suffix when selecting for automotive applications.

What is the reverse leakage current of the 1N5817 at elevated temperature?

The 1N5817 exhibits a maximum reverse leakage current (I_R) of 1 mA at 25°C and rated V_R, rising to 10 mA at 100°C. This temperature-dependent leakage impacts standby power in always-on circuits; designers should account for it in battery-backed or energy-harvesting systems where ultra-low quiescent current is critical.

Can the 1N5817 replace a 1N4007 in a switching power supply?

The 1N5817 can replace a 1N4007 only in low-voltage, high-frequency applications where V_RRM ≥ 20V suffices and reverse recovery speed matters. Unlike the slow 1N4007 (t_rr ≈ 30 µs), the 1N5817 is a Schottky with no minority-carrier storage, enabling clean switching above 50 kHz. However, its 20V V_RRM makes it unsuitable for 100V+ rectification where the 1N4007's 1000V rating applies.

What does the "x" in ordering codes like 1N581x indicate for the 1N5817?

In Taiwan Semiconductor's ordering nomenclature, the "x" in 1N581x denotes the voltage grade: "7" = 20V (1N5817), "8" = 30V (1N5818), "9" = 40V (1N5819). Thus, 1N5817 explicitly identifies the 20V-rated variant. Packaging and qualification options (e.g., "H" for AEC-Q101) are appended separately and do not affect the core voltage designation encoded in the part number.