Taiwan Semiconductor Corporation LSR104 L0G

Overview

LSR104 L0G from Taiwan Semiconductor is a 1 A, 40 V repetitive peak reverse voltage Schottky surface-mount rectifier in MELF package, with 25 A surge rating, 0.55 V max forward voltage at 1.0 A, and 110 pF junction capacitance - used in DC-DC converter output stages for low-loss freewheeling.

For engineers reviewing the LSR104 L0G datasheet, LSR104 L0G pinout, LSR104 L0G application, or LSR104 L0G equivalent, key selection criteria include VRRM = 40 V, IF = 1 A, VF ≤ 0.55 V, TJ(max) = +150°C, and MELF mechanical compatibility with automated placement systems.

Technical Context

This Schottky rectifier operates as a unidirectional power switching device with metal–semiconductor junction, enabling low forward conduction loss and fast recovery (no minority carrier storage). Its MELF package provides high thermal conductivity and robust mechanical stability under thermal cycling.

Rated for continuous operation up to +150°C junction temperature, it supports high-efficiency 12 V/24 V input DC-DC converters where low VF minimizes conduction loss and 110 pF CJ limits high-frequency switching noise coupling.

Key Specifications

Pinout & Package

Package: MELF (Metal Electrode Leadless Face), cylindrical glass-passivated body with cathode band marking polarity. Dimensions: A = 4.80–5.50 mm length, B = 2.25–2.67 mm diameter, C = 0.30–0.60 mm end radius.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STPS1L40S and SS14-E3/5AT, the LSR104 L0G delivers superior thermal performance (80°C/W) in a compact MELF form factor ideal for high-density automated assembly, while maintaining competitive VF and surge capability without requiring layout changes.

Availability

LSR104 L0G is available at Aetrix Electronics and suitable for inverters, AC-DC adapters, and DC-DC buck converters requiring stable component supply, RoHS/halogen-free compliance, and MELF packaging for high-reliability production.

Supply support for LSR104 L0G 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 protection markets since 1979.

The LSR102–LSR106 series was designed specifically for cost-sensitive, high-volume surface-mount power rectification in consumer and industrial power supplies where low VF, MELF reliability, and automated assembly compatibility are critical.

FAQ

What is the maximum junction temperature rating for the LSR104 L0G?

The LSR104 L0G has a maximum junction temperature (TJ(max)) of +150°C, verified per absolute maximum ratings table in the official Taiwan Semiconductor datasheet revision H2004. This allows reliable operation in thermally demanding locations such as near transformers or in sealed enclosures. Derating curves confirm 1 A continuous current is maintained up to this limit when ambient and thermal resistance conditions are met. The LSR104 L0G must not be operated beyond this temperature to avoid permanent parametric shift or failure.

Is the LSR104 L0G RoHS and halogen-free compliant?

Yes, the LSR104 L0G is fully RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the "Features" section of the Taiwan Semiconductor datasheet (H2004). The molding compound contains no brominated flame retardants or chlorine-based additives. This compliance is verified through material declarations and third-party testing, making the LSR104 L0G suitable for export to EU, Japan, and other regulated markets requiring strict environmental adherence.

What does the "L0G" suffix indicate in LSR104 L0G?

The "L0G" suffix in LSR104 L0G denotes the packaging and reel configuration: MELF package supplied on 13-inch reels with 5,000 units per reel, per the "Ordering Information" table in the Taiwan Semiconductor datasheet. It is not a variant code for electrical parameters - all electrical specs (VRRM = 40 V, VF ≤ 0.55 V, etc.) are fixed for LSR104 regardless of suffix. The LSR104 L0G is the standard production version intended for automated SMT lines.

How does the junction capacitance of the LSR104 L0G affect high-frequency switching performance?

The LSR104 L0G exhibits a typical junction capacitance (CJ) of 110 pF at 1 MHz and 4 V reverse bias, which directly influences high-frequency switching behavior by contributing to reverse recovery charge and capacitive turn-on loss. In 100–500 kHz DC-DC converters, this value helps minimize ringing and EMI compared to higher-CJ alternatives. The LSR104 L0G's CJ is confirmed in the "Electrical Specifications" table and validated via curve Fig.5 in the official datasheet.

Can the LSR104 L0G replace a standard PN-junction rectifier in an existing design?

Yes, the LSR104 L0G can replace a 1 A, 40 V PN rectifier (e.g., 1N4007 variant) in most cases, delivering lower forward voltage (0.55 V vs. ~0.9–1.1 V), faster effective recovery, and reduced thermal stress. However, its higher reverse leakage (1 mA @ 25°C) must be evaluated in high-impedance bias networks. Layout remains identical due to MELF footprint compatibility. The LSR104 L0G is not a drop-in replacement for devices requiring >40 V VRRM or >1 A IF - always verify operating margins using the full LSR104 L0G datasheet.