Taiwan Semiconductor Corporation 1N5817 A0G

Overview

1N5817 A0G from Taiwan Semiconductor is a 1A, 20V Schottky barrier rectifier in DO-41 package, featuring low forward voltage drop (max 0.45 V at 1 A), 30 A surge current capability, and AEC-Q101 qualification option. It serves as a high-efficiency output rectifier in DC-DC converters and offline SMPS secondary-side circuits.

For engineers reviewing the 1N5817 A0G datasheet, 1N5817 A0G pinout, 1N5817 A0G application, or 1N5817 A0G equivalent, key selection criteria include its 20 V repetitive peak reverse voltage, 100 °C/W junction-to-ambient thermal resistance, cathode-band polarity marking, RoHS/halogen-free compliance, and 3,000-unit ammo box packaging configuration.

Technical Context

This discrete Schottky diode uses a single-die construction with guard ring structure to enhance overvoltage ruggedness and suppress leakage under transient stress. Its low VF enables reduced conduction loss in high-frequency switching topologies where thermal management is constrained.

The device operates across –55 °C to +125 °C junction temperature range and exhibits 55 pF junction capacitance at 1 MHz and 4 V reverse bias - a value critical for minimizing switching noise and EMI in fast-switching power stages.

Key Specifications

Pinout & Package

DO-204AL (DO-41) axial-leaded package with cathode indicated by a painted band on the body. Leads are pure tin-plated and solderable per J-STD-002; weight ≈ 0.330 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SB120-E3/54 and SS12, the 1N5817 A0G offers the lowest VF (0.45 V), highest IFSM (30 A), and axial DO-41 form factor ideal for manual assembly, field service, and cost-sensitive through-hole designs - especially where thermal headroom and surge robustness are prioritized.

Availability

1N5817 A0G is available at Aetrix Electronics and suitable for switching mode power supplies, DC-DC converters, and AC-DC adapters requiring stable component supply, consistent lead-time visibility, and traceable sourcing for production ramp-up.

Supply support for 1N5817 A0G 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 global power, automotive, and industrial markets since 1979.

The 1N5817 A0G belongs to TSC's general-purpose Schottky rectifier product line, engineered for high-efficiency, cost-optimized AC-DC and DC-DC power conversion in consumer, industrial, and automotive auxiliary power systems.

FAQ

What is the maximum junction temperature rating for the 1N5817 A0G?

The 1N5817 A0G has a maximum junction temperature (TJ MAX) of +125 °C, with operational range from –55 °C to +125 °C. This rating applies under specified thermal conditions and must be verified using RθJA = 100 °C/W and actual power dissipation. Derating is required above 75 °C ambient; full 1 A current is only guaranteed up to 75 °C case temperature. The 1N5817 A0G must be mounted with adequate copper area or airflow to avoid exceeding TJ MAX in sustained operation.

Does the 1N5817 A0G have AEC-Q101 qualification?

The base 1N5817 A0G part is not AEC-Q101 qualified; however, Taiwan Semiconductor offers an AEC-Q101-qualified variant identified by the "H" suffix (e.g., 1N5817H or 1N5817HA0G). The 1N5817 A0G itself meets RoHS and halogen-free standards and shares identical electrical specs and DO-41 packaging, but automotive qualification requires explicit ordering of the "H"-suffixed version confirmed in TSC's official qualification reports.

What does the "A0G" suffix mean in 1N5817 A0G?

The "A0G" suffix in 1N5817 A0G indicates Taiwan Semiconductor's standard packaging configuration: "A0" denotes ammo box packaging, and "G" signifies green (halogen-free) molding compound compliant with IEC 61249-2-21. This version ships in 3,000-unit ammo boxes and replaces lead-free solderability requirements per J-STD-002. The 1N5817 A0G is functionally identical to tape-and-reel versions except for packaging format and reel compatibility.

How does the 1N5817 A0G compare to the 1N5819 in terms of reverse voltage rating?

The 1N5817 A0G has a repetitive peak reverse voltage (VRRM) of 20 V, whereas the 1N5819 is rated for 40 V. Both share identical package (DO-41), forward current (1 A), and surge rating (30 A), but the 1N5817 A0G is optimized for lower-voltage applications like 5 V/12 V outputs where tighter VF control (0.45 V max) and reduced junction capacitance improve efficiency. Using 1N5817 A0G in a 40 V circuit risks reverse breakdown; always match VRRM to system-level transient and ripple margins.

Is the 1N5817 A0G suitable for high-frequency switching applications above 100 kHz?

Yes, the 1N5817 A0G is suitable for high-frequency switching applications up to several hundred kHz due to its Schottky architecture - zero minority-carrier storage delay and 55 pF junction capacitance at 1 MHz. Its 10,000 V/µs dv/dt rating supports stable operation in flyback and resonant converters. However, at frequencies above 500 kHz, parasitic inductance of DO-41 leads may dominate; for >1 MHz designs, consider surface-mount alternatives. The 1N5817 A0G remains widely deployed in 65–130 kHz SMPS platforms.