Diodes Incorporated AL5890-20P1-13

Overview

AL5890-20P1-13 from Diodes Incorporated is a 400V constant-current linear LED driver in PowerDI®123 (Type B) package, delivering a factory-trimmed 20mA ±1.5mA output with <±2.0mA typical current tolerance over −40°C to +105°C ambient. It operates as a two-terminal high-side or low-side current regulator for LED strings up to 400V, featuring thermal foldback activation at +130°C junction temperature and 7V minimum turn-on voltage. Used in commercial downlights and emergency lighting where compact size and resistorless current setting are critical.

For engineers reviewing the AL5890-20P1-13 datasheet, AL5890-20P1-13 pinout, AL5890-20P1-13 application, or AL5890-20P1-13 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and confirmed alternative parts with documented functional differences.

Technical Context

The AL5890-20P1-13 implements a bandgap-referenced linear current regulator with internal voltage reference and feedback loop controlling an integrated pass transistor. Its functional block includes a precision current-sense amplifier, thermal foldback comparator, and startup threshold circuit that activates only when VIN–OUT exceeds 7V.

It supports both high-side and low-side configurations without external components, enabling direct series connection to LED strings. Thermal foldback begins at TJ = +130°C and linearly reduces output current to limit power dissipation, preserving reliability under sustained high-voltage/high-temperature conditions.

Key Specifications

Pinout & Package

AL5890-20P1-13 uses the PowerDI®123 (Type B) thermally enhanced surface-mount package (3.70mm × 2.80mm × 1.78mm), with exposed cathode pad for improved heat transfer. The device has two active terminals and no NC pins in this variant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar constant-current LED driver applications.

Compared with AL5809-20P1-13, the AL5890-20P1-13 adds 200V headroom and thermal foldback for robustness in high-voltage lighting; versus NSI45020AZT1G, it trades resistor flexibility for guaranteed accuracy, smaller footprint, and extended voltage range - making it optimal for fixed-output, high-reliability LED systems.

Availability

AL5890-20P1-13 is available at Aetrix Electronics and suitable for commercial LED lighting fixtures, emergency lighting systems, and architectural cove lighting requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for AL5890-20P1-13 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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with emphasis on power management, signal integrity, and lighting control solutions.

The AL5890 belongs to Diodes' Constant Current LED Driver product line, engineered specifically for simple, reliable, and cost-effective linear driving of medium-to-high-voltage LED strings in commercial and industrial lighting.

FAQ

What is the minimum input voltage required to activate AL5890-20P1-13?

The AL5890-20P1-13 turns on when the voltage between IN and OUT exceeds 7V, with typical turn-on threshold ranging from 5V to 7V depending on temperature and unit variation. Below this, the device remains in high-impedance state and delivers zero current to the LED string.

Can AL5890-20P1-13 be used in AC-powered LED circuits?

Yes - it supports AC configurations when paired with a bridge rectifier. The device regulates current during both half-cycles, provided the peak rectified voltage stays within 7V–400V and the average power dissipation remains within thermal limits defined by the PowerDI123 package and PCB copper area.

Does AL5890-20P1-13 require a heatsink in typical downlight applications?

No external heatsink is required if PCB layout follows Diodes' recommended 25.4mm × 25.4mm 2oz copper pad. With θJA = 75.84°C/W, the device dissipates up to 1.33W at TA = +25°C; at +60°C ambient, derating to ~0.9W ensures TJ stays below +125°C in standard FR4 assemblies.

How does thermal foldback affect LED brightness in high-temperature environments?

At junction temperatures above +130°C, AL5890-20P1-13 linearly reduces output current to limit power dissipation - e.g., at +140°C TJ, current drops to ~15mA. This preserves LED lifetime and prevents thermal runaway, though luminance decreases proportionally with current reduction.