Diodes Incorporated RS402L

Overview

RS402L from Diodes Incorporated is a 4.0A, 100V PIV single-phase bridge rectifier in RS-4L plastic package, featuring 200A peak surge rating, 1.0V max forward voltage at 3.0A, and UL 94V-0 flammability compliance - used in AC/DC power supplies for industrial control panels requiring high-reliability input rectification.

For engineers reviewing the RS402L datasheet, RS402L pinout, RS402L application, or RS402L equivalent, key selection criteria include peak reverse voltage (100V), average forward current (4.0A @ 50°C), surge capability (200A, 8.3ms), thermal derating curve, and RS-4L mechanical footprint compatibility with through-hole PCB layouts.

Technical Context

The RS402L integrates four silicon diodes in a single-phase full-wave bridge configuration, enabling AC-to-DC conversion without center-tapped transformers. Its 100V VRRM rating supports 70V RMS input (e.g., 100VAC nominal systems) and accommodates transient overvoltage up to 200A non-repetitive surge per JEDEC Method.

Thermal performance is defined by case temperature derating: full 4.0A output is rated only at TC ≤ 50°C, dropping linearly to ~2.0A at TC = 100°C. Reverse leakage remains ≤10.0μA at 25°C and ≤1.0mA at 100°C under rated DC blocking voltage.

Key Specifications

Pinout & Package

Package: RS-4L plastic case, through-hole mount, UL 94V-0 rated, approx. 5.6 g weight, 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 RS402L, GBU4005 trades voltage headroom for compactness and slightly better thermal performance, while MB10F prioritizes extreme reverse voltage at the cost of surge robustness and board area - RS402L uniquely balances 100V rating, 200A surge, and standardized RS-4L mounting.

Availability

RS402L is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, motor control interface rectifiers, embedded system front-end rectifiers, and test equipment AC input stages requiring stable component supply and long-term manufacturability.

Supply support for RS402L 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, headquartered in Plano, Texas, serving industrial, computing, consumer, and communications markets with high-reliability components.

The RS401L–RS407L series targets cost-sensitive, high-volume AC/DC front-end rectification where UL recognition, surge resilience, and thermal stability are primary design requirements.

FAQ

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

The RS402L delivers its full 4.0A average forward current rating only when case temperature (TC) is maintained at or below 50°C, as specified in Figure 1 of the datasheet. Above 50°C, current must be linearly derated - e.g., 3.0A at TC = 75°C and 2.0A at TC = 100°C - to prevent junction overheating beyond 150°C.

Can RS402L replace RS401L in an existing design?

Yes, RS402L is a direct upgrade from RS401L (50V → 100V VRRM) with identical RS-4L package, pinout, and thermal characteristics. No layout or thermal redesign is needed, and the higher reverse voltage provides additional margin against line transients in 100VAC applications.

Is RS402L suitable for capacitive-load applications?

No - the datasheet explicitly states "For capacitive load, derate current by 20%." At 50°C case temperature, this limits usable current to 3.2A. Additional derating may be required depending on capacitor ESR and charge cycle frequency to avoid exceeding IFSM or thermal limits.

Does RS402L require heatsinking in standard PCB mount?

Heatsinking is not required for 4.0A operation at TC ≤ 50°C with adequate copper pour (≥250 mm² per terminal) and ambient airflow ≥0.5 m/s. However, in sealed enclosures or at elevated ambient temperatures (>40°C), a small clip-on heatsink or thermal pad improves reliability and extends lifetime by reducing junction temperature swing.