Diodes Incorporated AL5809-30QP1-7

Overview

AL5809-30QP1-7 from Diodes Incorporated is a two-terminal, AEC-Q100 Grade 1 qualified constant current linear LED driver delivering a precise 30mA ±5% output over -40°C to +150°C junction temperature, with 2.5V–60V operating voltage range and 60V absolute maximum input-output rating-designed for high-side or low-side LED string control in automotive interior lamps and instrumentation illumination.

For engineers reviewing the AL5809-30QP1-7 datasheet, AL5809-30QP1-7 pinout, AL5809-30QP1-7 application, or AL5809-30QP1-7 equivalent, key selection criteria include thermal shutdown threshold (+165°C), PWM dimming compatibility (100–200Hz, 5–95% duty cycle), PowerDI123 (Type B) package thermal resistance (θJA = 148.6°C/W on 25.4mm² FR-4), and ±5% current accuracy across full automotive voltage and temperature extremes.

Technical Context

The AL5809-30QP1-7 implements a fixed-current linear regulator architecture using an internal precision current mirror and preset reference resistor to deliver stable 30mA output without external components. Its low-dropout internal LDO powers the regulation block, enabling operation down to 2.5V VINOUT while maintaining tight current tolerance.

It supports bidirectional placement-IN terminal accepts current for low-side drive (LED cathode connected), or OUT terminal sources current for high-side drive (LED anode connected). Thermal shutdown activates at +165°C with +30°C hysteresis, ensuring robust operation under transient overload or ambient stress in automotive environments.

Key Specifications

Pinout & Package

Supplied in thermally enhanced PowerDI123 (Type B) package (3.7mm × 2.8mm × 1.78mm), featuring exposed cathode pad for PCB heat sinking and optimized thermal vias support. Package meets AEC-Q100 mechanical and thermal stress qualifications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL5809-30QP2-7, the P1 variant offers 7.8% lower θJA for improved thermal headroom; versus NSI50010YT1G, it adds AEC-Q100 Grade 1 compliance, thermal shutdown, and 20V higher transient withstand-critical for functional safety in automotive lighting systems.

Availability

AL5809-30QP1-7 is available at Aetrix Electronics and suitable for automotive interior lamps, instrumentation illumination, parking lights, and license plate lighting requiring stable component supply, AEC-Q100 compliance, and production-ready traceability.

Supply support for AL5809-30QP1-7 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 ICs, specializing in high-reliability power management, signal integrity, and lighting solutions for automotive, industrial, and consumer markets.

The AL5809Q product line delivers AEC-Q100-qualified, two-terminal constant current drivers for automotive LED lighting-designed to replace resistor-based biasing with precision, thermal resilience, and topology flexibility in space- and cost-constrained modules.

FAQ

What is the minimum input voltage required for AL5809-30QP1-7 to begin regulating?

The AL5809-30QP1-7 turns on when the voltage across its IN and OUT terminals reaches approximately 1.5V, with a guaranteed range of 1.0V to 2.0V over -40°C to +150°C. This enables reliable startup during automotive cold-cranking events where battery voltage may dip to 6–7V, provided the LED string forward voltage leaves ≥1.5V across the device.

Can AL5809-30QP1-7 be used in parallel to increase total LED current?

Yes-multiple AL5809-30QP1-7 units can be paralleled to achieve higher total current (e.g., two devices yield ~60mA). Diodes Incorporated validates this in Figure 3 of DS38233, confirming matched current sharing within ±5% tolerance when devices are mounted on identical thermal pads with symmetrical layout and trace lengths.

Does AL5809-30QP1-7 require external capacitors or compensation components?

No-AL5809-30QP1-7 is internally compensated and operates stably without external capacitors. Its two-terminal architecture eliminates all external passive components, including current-setting resistors and bypass capacitors, reducing bill-of-materials and PCB area while improving long-term reliability.

How does thermal shutdown behave during PWM dimming?

Thermal shutdown remains fully active during PWM dimming: the junction temperature is monitored continuously, and shutdown triggers at +165°C regardless of duty cycle. Recovery occurs only after junction cools by ≥30°C, preventing oscillation. This ensures protection during sustained high-duty-cycle or high-ambient conditions-even when average power appears low.