Diodes Incorporated AL5809-30P1-7

Overview

AL5809-30P1-7 from Diodes Incorporated is a two-terminal constant current linear LED driver in PowerDI123 package, delivering 30mA ±5% regulated current over -40°C to +125°C, with 2.5V–60V input-to-output voltage range and 20ppm/°C temperature drift. It supports high-side or low-side LED string driving in offline AC/DC LED lamps and white goods illumination.

For engineers reviewing the AL5809-30P1-7 datasheet, AL5809-30P1-7 pinout, AL5809-30P1-7 application, or AL5809-30P1-7 equivalent, key selection criteria include fixed-current accuracy across wide V_IN-OUT, thermal shutdown at +165°C, 60V floating-ground rating for offline surge resilience, and PowerDI123 thermal performance (θ_JA = 148.6°C/W on FR-4).

Technical Context

The AL5809-30P1-7 integrates an internal precision current mirror and LDO regulator to maintain stable 30mA output independent of input voltage variation from 2.5V to 60V. Its floating ground architecture enables direct series connection between IN and OUT pins without reference to system ground.

It features thermal shutdown with +165°C trip point and +30°C hysteresis, plus 4kV HBM ESD protection. The device operates with no external components-current setting is factory-trimmed-and supports PWM dimming via external MOSFET switching at the OUT pin with 500µs minimum on/off pulse width.

Key Specifications

Pinout & Package

AL5809-30P1-7 uses the PowerDI123 surface-mount package (3.7mm × 2.8mm × 1.78mm), thermally optimized with exposed cathode pad for PCB heat sinking. Pin 1 (IN) and Pin 2 (OUT) are symmetrical terminals with no polarity-function depends on circuit topology.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL5809-30S1-7, the -30P1-7 offers 3.5× higher power handling and superior surge resilience; versus NSI45030AZT1G, it trades ±2% accuracy for 33% higher voltage rating and integrated thermal protection essential for unattended lighting systems.

Availability

AL5809-30P1-7 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 traceable sourcing for industrial production.

Supply support for AL5809-30P1-7 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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and lighting solutions for industrial and consumer markets.

The AL5809 product line delivers cost-effective, resistorless constant current regulation for LED lighting, targeting applications where simplicity, thermal robustness, and AC-line compatibility are prioritized over digital control.

FAQ

Can AL5809-30P1-7 drive LEDs in both high-side and low-side configurations?

Yes. In low-side mode, connect LED anode to OUT and cathode to IN; in high-side mode, connect LED anode to IN and cathode to OUT. The floating ground architecture enables either topology without external level-shifting components, and the 60V V_IN-OUT rating ensures safe operation under reverse-bias conditions during switching transitions.

What is the minimum input voltage required to turn on AL5809-30P1-7?

The minimum turn-on voltage is 2.5V across IN and OUT pins, verified over -40°C to +125°C. This allows driving as few as one LED in series from a 3.3V rail or two standard white LEDs (V_f ≈ 3.2V each) from a 12V supply, provided the remaining voltage drop (≥2.5V) appears across the device for regulation.

How does thermal shutdown behave in AL5809-30P1-7?

Thermal shutdown activates at +165°C junction temperature and latches off until junction cools by ≥30°C (hysteresis), resuming regulation at ~+135°C. This prevents thermal runaway during sustained overload or poor heatsinking, and recovery is automatic-no external reset is needed.

Is AL5809-30P1-7 compatible with PWM dimming?

Yes. Connect an external N-channel MOSFET between OUT and ground, driven by a 100–200Hz PWM signal. The device's 500µs minimum on/off pulse width ensures clean current switching, and dimming linearity is maintained across 5–95% duty cycle per the datasheet's validated test conditions.