Diodes Incorporated PR1505S-T

Overview

PR1505S-T 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 industrial SMPS.

For engineers reviewing the PR1505S-T datasheet, PR1505S-T pinout, PR1505S-T application, or PR1505S-T equivalent, key selection criteria include VRRM derating margin, trr-dependent switching loss in 50–100kHz flyback converters, 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 switching with low forward conduction loss and controlled reverse recovery behavior. Its 150ns trr (measured at IF = 0.5A, IR = 1.0A, Irr = 0.25A) enables reduced switching losses compared to standard recovery rectifiers in medium-frequency SMPS topologies.

The 600V VRRM rating supports universal-input (85–265VAC) offline applications with adequate safety margin. Thermal performance is defined under JEDEC conditions: leads held at ambient temperature at 9.5mm from case, enabling reliable 1.5A average current handling at TA = 50°C.

Key Specifications

Pinout & Package

DO-41 axial-leaded plastic package with cathode band marking. Standard lead spacing and form factor compatible with manual and wave-solder assembly.

Key Features

Applications

Availability

PR1505S-T is available at Aetrix Electronics and suitable for AC/DC adapter front-ends, industrial SMPS input stages, LED driver bridges, and motor control auxiliary supplies requiring stable component supply and legacy DO-41 compatibility.

Supply support for PR1505S-T 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, signal integrity, and protection solutions for industrial and consumer markets.

The PR150x/S series targets cost-sensitive, high-volume rectification applications where fast recovery, proven DO-41 reliability, and JEDEC-standard thermal performance are prioritized over ultra-low Qrr or surface-mount integration.

FAQ

Is PR1505S-T suitable for new designs?

No - the datasheet explicitly states "NOT RECOMMENDED FOR NEW DESIGN". It remains viable for legacy repair, maintenance, and continuity builds where DO-41 footprint and 600V/1.5A specs match existing schematics, but newer alternatives offer lower trr, higher efficiency, or SMT packaging.

What is the cathode identification method on PR1505S-T?

The cathode is marked by a distinct opaque band near one end of the DO-41 cylindrical body. This band aligns with the cathode terminal in schematic symbols and must connect toward the positive DC output side in rectifier configurations.

How does PR1505S-T compare to PR1505-T (DO-15)?

PR1505S-T uses DO-41 (smaller body, 2.0–2.72mm diameter), while PR1505-T uses DO-15 (larger, 2.6–3.6mm). Both share identical electrical specs, but DO-41 offers tighter board space usage and lower weight (0.3g vs. 0.4g); DO-15 provides higher thermal mass and slightly better surge handling.

Can PR1505S-T replace 1N5408 in existing designs?

Yes - both are 3A-rated DO-204AL rectifiers, but PR1505S-T is rated 1.5A average (not 3A) and has faster trr (150ns vs. ~2000ns). It can replace 1N5408 only if peak current stays ≤1.5A and faster recovery improves system efficiency; verify thermal margin due to lower IO rating.