Taiwan Semiconductor Corporation SR302 A0G

Overview

SR302 A0G from Taiwan Semiconductor is a 3A, 20V Schottky barrier rectifier in DO-201AD package, featuring low forward voltage (0.55 V max at 3 A, 25°C), high surge capability (80 A), and AEC-Q101 qualification option. It serves as primary output rectifier in compact SMPS and DC-DC converters for industrial adapters and embedded power supplies.

For engineers reviewing the SR302 A0G datasheet, SR302 A0G pinout, SR302 A0G application, or SR302 A0G equivalent, key selection factors include its 20 V V_RRM, 125°C max junction temperature, DO-201AD mechanical compatibility, and cathode-band polarity marking-critical for layout validation and thermal derating in high-density power designs.

Technical Context

This discrete Schottky diode uses a single-die construction with guard ring overvoltage protection and pure tin-plated leads compliant with J-STD-002 solderability. Its 15 °C/W junction-to-case thermal resistance supports conduction-cooled mounting on PCB copper pours.

Rated for repetitive peak reverse voltage of 20 V and reverse rms voltage of 14 V, it delivers 3 A average forward current with 500 µA max reverse leakage at 25°C and 10 mA at 100°C-enabling efficient operation in low-voltage, high-current secondary-side rectification.

Key Specifications

Pinout & Package

DO-201AD axial-leaded package with cathode indicated by band-marked end; body length 7.2 mm, diameter 2.7 mm, lead spacing 5.3 mm; RoHS-compliant, halogen-free molding compound rated UL 94V-0.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-3EWH02-M3/5BT and SB320-E3/54, SR302 A0G offers verified AEC-Q101 availability, tighter V_F consistency across production lots, and documented 1.10 g weight for automated assembly calibration-making it preferred for automotive-tier BOMs and high-volume OEM programs requiring traceable sourcing.

Availability

SR302 A0G is available at Aetrix Electronics and suitable for adapter power supplies, USB-C PD secondary rectification, and industrial DC-DC converters requiring stable component supply, long-term lifecycle support, and RoHS/halogen-free compliance.

Supply support for SR302 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 SR302 A0G belongs to TSC's SR3xx Schottky rectifier family, engineered specifically for high-efficiency, high-reliability secondary-side rectification in compact, thermally constrained AC/DC and DC/DC power stages.

FAQ

What is the maximum junction temperature rating for SR302 A0G?

The SR302 A0G has a maximum junction temperature (T_J) of 125°C. This rating applies under continuous forward conduction at rated current and must be maintained via appropriate PCB copper area or heatsinking. Exceeding 125°C risks parametric shift and accelerated degradation. The SR302 A0G datasheet specifies derating curves confirming usable current drops to zero at 150°C ambient-so thermal design must keep T_J ≤ 125°C at worst-case load and ambient.

Does SR302 A0G have AEC-Q101 qualification?

The SR302 A0G itself is not AEC-Q101 qualified; however, the SR302H and SR302HA0G variants are explicitly qualified per AEC-Q101. The "H" suffix denotes automotive qualification. Since SR302 A0G uses the same die and DO-201AD package as the qualified versions, it shares identical electrical and thermal performance-but formal AEC-Q101 documentation and test reports apply only to the "H"-suffixed part numbers. For automotive programs, SR302H A0G is the compliant choice.

What is the reverse leakage current specification for SR302 A0G at 100°C?

At 100°C junction temperature and rated reverse voltage (20 V), the SR302 A0G exhibits a maximum reverse leakage current (I_R) of 10 mA. This value is specified in the Electrical Specifications table under "Reverse current @ rated V_R" for SR302–SR304 devices at T_J = 100°C. It reflects worst-case leakage under thermal stress and is critical for calculating standby power loss in always-on systems.

How does the forward voltage of SR302 A0G compare to SR303 A0G?

The SR302 A0G has a maximum forward voltage (V_F) of 0.55 V at 3 A and 25°C, whereas the SR303 A0G (30 V V_RRM) is rated at 0.55 V max under identical conditions. Both share the same V_F ceiling because they use identical Schottky die architecture optimized for low-voltage operation. However, SR303 A0G's higher blocking voltage comes with slightly increased series resistance, making its typical V_F ~0.02–0.03 V higher than SR302 A0G at light loads-a difference confirmed in the "Typical Forward Characteristics" curve (Fig.4) of the SR302–SR320 datasheet.

What packaging options are available for SR302 A0G?

The SR302 A0G is supplied in 500-piece ammo boxes, as indicated by the "A0G" suffix in the ordering code. This contrasts with the base "SR302" (tape-and-reel, 1250 pcs) and "SR302H" (tape-and-reel, 1250 pcs). The ammo box format supports manual or semi-automated placement in low-to-medium volume production and prototyping. All variants use the same DO-201AD package with pure tin-plated leads and UL 94V-0 molding compound.