Diodes Incorporated RS403L

Overview

RS403L from Diodes Incorporated is a 4.0A single-phase bridge rectifier with 200V peak reverse voltage (VRRM), 1.0V forward voltage at 3.0A, and 200A non-repetitive surge current rating (IFSM). It uses an RS-4L plastic package (UL 94V-0), supports operation from –55°C to +150°C, and is rated for 1000V DC blocking. It is used in AC/DC power supplies for industrial control panels requiring compact, high-surge-capable rectification.

For engineers reviewing the RS403L datasheet, RS403L pinout, RS403L application, or RS403L equivalent, key selection factors include its 200V VRRM rating, 4.0A average forward current at 50°C case temperature, thermal derating curve, UL recognition (E94661), and compatibility with standard through-hole PCB mounting in oriented layouts.

Technical Context

The RS403L integrates four silicon diodes in a single-phase full-wave bridge configuration, enabling direct AC-to-DC conversion without external wiring. Its design supports resistive or inductive loads at 60Hz, with mandatory 20% current derating for capacitive loads per datasheet guidance.

Thermal performance is defined by case temperature (TC) derating - I(AV) drops linearly from 4.0A at 50°C to zero at ~135°C - and junction-to-case thermal resistance is optimized via the RS-4L package's 5.6g mass and lead-frame construction.

Key Specifications

Pinout & Package

RS403L uses the RS-4L molded plastic package (UL 94V-0), with four tinned copper leads suitable for wave or hand soldering (MIL-STD-202, Method 208). Dimensions: A = 18.5–19.5 mm, B = 15.4–16.0 mm, D = 6.2–6.5 mm, E = 4.6–5.6 mm, G = 1.5–2.0 mm, H ≈ 1.3 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RS403L, GBU4005 offers smaller size but insufficient voltage rating for 120VAC use, while RS404L provides immediate 400V VRRM headroom with identical thermal and mounting behavior - making it the preferred upgrade path for new designs targeting global input ranges.

Availability

RS403L is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, motor control interface rectifiers, embedded HVAC control boards, and test equipment AC adapter input stages requiring stable component supply and long-term manufacturability.

Supply support for RS403L 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management and signal integrity solutions for industrial, computing, and consumer markets.

The RS401L–RS407L series targets cost-sensitive, high-volume AC/DC front-end rectification where UL recognition, surge robustness, and wide temperature operation are mandatory - particularly in legacy industrial controls and replacement power modules.

FAQ

What is the maximum allowable case temperature for continuous 4.0A operation?

The RS403L delivers 4.0A average forward current only at TC = 50°C, as defined in Figure 1 of the datasheet. Above this temperature, current must be linearly derated - e.g., 3.2A at 70°C, 2.0A at 100°C - until reaching zero at approximately 135°C. Heatsinking is required for sustained >50°C ambient operation.

Is RS403L suitable for capacitive-load applications like switch-mode power supply inputs?

No - the datasheet explicitly states "For capacitive load, derate current by 20%." At 50°C case temperature, that reduces usable I(AV) to 3.2A. Additionally, high dv/dt from SMPS switching can increase stress on the junction; Diodes Incorporated recommends GBU-series alternatives for new capacitive-load designs.

Does RS403L have a built-in thermal shutdown mechanism?

No. The RS403L is a passive silicon bridge rectifier with no integrated thermal protection. Safe operation depends entirely on external thermal design - including PCB copper area, heatsink attachment, airflow, and derating per the published I(AV) vs. TC curve. Junction temperature must remain within –55°C to +150°C.

Can RS403L replace RS402L in an existing design?

Yes - RS403L is a direct upgrade from RS402L (100V VRRM) with identical package, pinout, and thermal characteristics, but doubled reverse voltage rating (200V VRRM). No layout or thermal changes are needed; it improves margin against line surges and enables compatibility with higher-input-voltage variants of the same system.