Diodes Incorporated AL5809-90P1-7

Overview

AL5809-90P1-7 from Diodes Incorporated is a two-terminal linear constant-current LED driver in PowerDI123 package, delivering 90mA ±5% regulated current across 2.5V–60V input-output differential voltage, with 20ppm/°C temperature drift and -40°C to +125°C operating range. It supports high-side or low-side LED string driving in offline AC/DC LED lamps and signage.

For engineers reviewing the AL5809-90P1-7 datasheet, AL5809-90P1-7 pinout, AL5809-90P1-7 application, or AL5809-90P1-7 equivalent, key selection criteria include its fixed 90mA output, 60V IN-OUT rating, thermal shutdown at +165°C, PWM dimming compatibility, and PowerDI123 thermal performance (θJA = 148.6°C/W on FR-4).

Technical Context

The AL5809-90P1-7 integrates an internal precision current mirror and LDO regulator to maintain stable 90mA output without external resistors. Its floating ground architecture enables operation with up to 60V differential between IN and OUT pins, supporting long LED strings in high-voltage offline applications.

It features built-in thermal shutdown (TSHDN = +165°C, hysteresis = +30°C) and robust ESD protection (4kV HBM). The device operates with minimum 2.5V startup voltage and supports PWM dimming via external MOSFET switching at the OUT pin with 500µs minimum on/off pulse width.

Key Specifications

Pinout & Package

AL5809-90P1-7 uses the PowerDI123 surface-mount package (3.7mm × 2.8mm × 1.78mm), optimized for thermal conduction via exposed cathode pad. Pin 1 (IN) serves as current input; Pin 2 (OUT) serves as current output - polarity determines high-side or low-side configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL5809-90P1-7, the SOD-123 variant sacrifices thermal capability for footprint reduction, while the NSI45090AZT1G trades voltage rating and safety features for tighter current tolerance - making the PowerDI123 version optimal for robust, high-voltage, thermally demanding LED systems.

Availability

AL5809-90P1-7 is available at Aetrix Electronics and suitable for offline LED lamps, white goods illumination, and LED signage requiring stable component supply, long-lifecycle assurance, and RoHS-compliant manufacturing.

Supply support for AL5809-90P1-7 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 solutions, with emphasis on power management, signal integrity, and LED lighting control.

The AL5809 product line delivers two-terminal constant-current LED drivers targeting cost-sensitive, high-reliability lighting applications - designed specifically to replace resistor-based current limiting in AC/DC and DC/DC LED systems.

FAQ

What is the minimum input-output voltage required for AL5809-90P1-7 to regulate?

The AL5809-90P1-7 requires a minimum 2.5V differential between IN and OUT pins to initiate and sustain regulation. Below this threshold, the device enters dropout and current drops nonlinearly. This enables driving short LED strings (e.g., two 3.2V LEDs) from a 12V rail with ≥5.9V headroom, ensuring stable 90mA output across line and load variations.

Can AL5809-90P1-7 be used in high-side configuration with PWM dimming?

Yes - in high-side configuration, the OUT pin connects to the LED cathode and is switched to ground via an external MOSFET. The AL5809-90P1-7's 500µs minimum off-time and validated 100–200Hz PWM operation ensure clean current interruption without current tailing or instability, provided gate drive rise/fall times are <100ns and layout minimizes parasitic inductance.

How does thermal shutdown behave under continuous overload?

When junction temperature reaches +165°C, AL5809-90P1-7 disables current flow until temperature falls by +30°C (to +135°C), then resumes regulation. This hysteresis prevents oscillation during thermal stress. Recovery is automatic and requires no reset signal - critical for self-protecting LED modules in sealed enclosures without active cooling.

Is AL5809-90P1-7 compatible with 24V DC industrial LED systems?

Yes - with 24V supply and typical 18V LED string voltage, the 6V differential yields 0.54W dissipation (90mA × 6V), well within PowerDI123's 1.2W capability on standard FR-4. Derating curves in the datasheet confirm reliable operation up to +125°C ambient at this power level, making it suitable for DIN-rail mounted LED drivers and control panel lighting.