Diodes Incorporated PR1505S-B

Overview

PR1505S-B from Diodes Incorporated is a 1.5A fast recovery rectifier diode in DO-41 package, rated for 600V peak repetitive reverse voltage (VRRM), 1.2V forward voltage at 1.5A, and 150ns reverse recovery time - optimized for high-efficiency AC/DC front-end rectification in offline power supplies and LED drivers.

For engineers reviewing the PR1505S-B datasheet, PR1505S-B pinout, PR1505S-B application, or PR1505S-B equivalent, key selection criteria include VRRM derating margin, trr-dependent switching loss in flyback/PFC stages, thermal resistance (RθJA = 35 K/W), and DO-41 lead-form compatibility with legacy through-hole PCB layouts.

Technical Context

This device uses a diffused junction process to achieve fast recovery characteristics while maintaining low forward voltage drop. Its 150ns trr (measured at IF = 0.5A, IR = 1.0A, Irr = 0.25A) enables operation in 50–100 kHz SMPS topologies without excessive switching loss.

The DO-41 package supports 1.5A average rectified current at TA = 50°C with defined lead length (9.5mm from case), and exhibits 5.0 µA max reverse leakage at 25°C and 100 µA at 100°C under full 600V DC blocking.

Key Specifications

Pinout & Package

DO-41 axial-leaded plastic package with cathode band marking. Standard lead finish: bright tin, solderable per MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1L06U and MUR160, PR1505S-B trades slightly slower recovery (150ns vs. 75ns) for higher average current (1.5A vs. 1.0–1.05A) and superior surge handling (50A vs. 30A), making it optimal for cost-sensitive, thermally constrained 1–2W primary-side rectifiers.

Availability

PR1505S-B is available at Aetrix Electronics and suitable for LED driver input rectification, industrial AC/DC adapter design, and appliance power supply input requiring stable component supply and legacy DO-41 through-hole compatibility.

Supply support for PR1505S-B 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, cost-optimized components for power management and signal integrity.

The PR1501/S–PR1505/S series targets cost-sensitive, high-volume AC/DC front-end applications where fast recovery, proven DO-41 reliability, and RoHS compliance are essential.

FAQ

Is PR1505S-B suitable for use in a 100 kHz flyback converter?

Yes - its 150ns reverse recovery time enables operation in 100 kHz flyback converters with acceptable switching loss and EMI. However, conduction loss dominates at this frequency due to 1.2V VFM; thermal design must account for 1.8W dissipation at 1.5A DC load.

What is the maximum allowable ambient temperature for continuous 1.5A operation?

Per Figure 1 in the datasheet, the forward derating curve specifies 1.5A IO only at TA = 50°C with leads maintained at ambient at 9.5mm from the case. At 75°C ambient, maximum continuous current drops to approximately 1.0A.

Does PR1505S-B have a specified junction-to-case thermal resistance (RθJC)?

No - the datasheet provides only RθJA = 35 K/W. RθJC is not specified; thermal modeling must rely on RθJA and board-level copper area, airflow, and mounting conditions per JEDEC JESD51 standards.

Can PR1505S-B replace PR1505-B in an existing design?

Yes - both share identical electrical specifications and 600V rating, but PR1505S-B uses DO-41 while PR1505-B uses DO-15. Mechanical fit requires verifying PCB pad spacing (DO-41 pitch = 5.0–5.5mm; DO-15 = 5.5–7.6mm) and lead diameter tolerance.