Taiwan Semiconductor Corporation B0520LW RHG

Overview

B0520LW RHG from Taiwan Semiconductor is a 20 V, 500 mA Schottky barrier diode in SOD-123 package, featuring low forward voltage (0.385 V at 500 mA), 5.5 A surge capability, and 125 °C max junction temperature - used in compact DC/DC converters and USB-powered adapters.

For engineers reviewing the B0520LW RHG datasheet, B0520LW RHG pinout, B0520LW RHG application, or B0520LW RHG equivalent, key selection criteria include VF matching at target load current, VRRM margin for input rail transients, thermal resistance (244 °C/W), reverse leakage at operating VR, and SOD-123 footprint compatibility with high-density PCB layouts.

Technical Context

This discrete Schottky diode uses a single silicon die optimized for low-loss rectification in low-voltage, medium-current switching applications. Its 20 V repetitive peak reverse voltage and 0.300 V forward voltage at 100 mA enable high efficiency in 3.3–12 V output SMPS stages.

The device operates across –55 °C to +125 °C junction temperature range and exhibits 170 pF junction capacitance at 0 V reverse bias - critical for minimizing switching node ringing in high-frequency flyback or buck topologies.

Key Specifications

Pinout & Package

Package: SOD-123 - surface-mount plastic case with cathode band marking; 10.0 mg weight; UL 94 V-0 molding compound; matte tin-plated leads compliant with J-STD-002 solderability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SB120-E3/54 and SS12, the B0520LW RHG delivers lowest VF at 500 mA in SOD-123, enabling highest efficiency in space-constrained 20 W adapters - but requires tighter thermal management due to lower I_F rating and higher R_θJA.

Availability

B0520LW RHG is available at Aetrix Electronics and suitable for USB-C power adapters, industrial DC/DC converters, and smart LED drivers requiring stable component supply with full traceability and no obsolescence risk.

Supply support for B0520LW RHG 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 management and signal conditioning markets since 1979.

The B0520LW RHG belongs to TSC's low-voltage Schottky diode family designed specifically for high-efficiency, low-profile AC/DC and DC/DC power conversion in consumer, industrial, and computing applications.

FAQ

What is the maximum continuous forward current rating for B0520LW RHG?

The B0520LW RHG is rated for 500 mA continuous forward current (I_F) at 25 °C ambient with adequate PCB copper thermal relief. Derating begins above 25 °C per the published forward current derating curve, reaching zero at 125 °C junction temperature. The B0520LW RHG must be mounted on ≥1 cm² of 1 oz copper to sustain full 500 mA at 70 °C ambient.

Does B0520LW RHG have a cathode marking, and how is polarity identified?

Yes, the B0520LW RHG uses a visible cathode band on the SOD-123 package body to indicate the cathode terminal. This band aligns with the cathode pin in the standardized SOD-123 footprint. The anode is the unmarked end. Polarity must be verified during placement to prevent reverse-bias failure - the B0520LW RHG has only 20 V reverse blocking capability.

What is the typical forward voltage of B0520LW RHG at 100 mA and 500 mA?

The B0520LW RHG exhibits 0.300 V maximum forward voltage at 100 mA and 0.385 V maximum at 500 mA, both measured at 25 °C. These values are guaranteed by Taiwan Semiconductor's production test limits. At 500 mA, the B0520LW RHG's VF is among the lowest in its SOD-123 20 V class, directly reducing conduction loss in high-duty-cycle applications.

Is B0520LW RHG RoHS and halogen-free compliant?

Yes, the B0520LW RHG is fully RoHS compliant and halogen-free per IEC 61249-2-21. Taiwan Semiconductor certifies that no brominated flame retardants or chlorine-based compounds exceed threshold limits in the molding compound or plating. This compliance is documented in the B0520LW RHG material declaration and applies to all production lots shipped after Version J2112.

What is the junction-to-ambient thermal resistance (R_θJA) of B0520LW RHG, and how does it affect layout?

The B0520LW RHG has a typical R_θJA of 244 °C/W under standard JEDEC test conditions. This high value means even 200 mW dissipation raises junction temperature by ~50 °C above ambient - requiring ≥0.5 cm² of 1 oz copper connected to both terminals. Without thermal relief, the B0520LW RHG will exceed 125 °C junction limit at just 300 mA in still air.