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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

Diodes Incorporated AL5809-50P1-7

Name: AL5809-50P1-7
Brand: Diodes Incorporated
SKU: AL5809-50P1-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AL5809-50P1-7

Manufacturer:: Diodes Incorporated

Category:: LED Drivers

Package:: POWERDI®123

Datasheet:: AL5809-50P1-7.pdf

Description:: IC LED DRVR LIN PWM 50MA PDI123

Quantity:: RFQ Add To RFQ list

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Inventory:78,710

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Product details

Overview

AL5809-50P1-7 from Diodes Incorporated is a two-terminal constant current linear LED driver in PowerDI123 package, delivering 50mA ±5% regulated current over -40°C to +125°C with 20ppm/°C temperature drift and 2.5V–60V input-to-output voltage range. It supports both high-side and low-side LED string configurations for offline AC/DC LED lamps and signage.

For engineers reviewing the AL5809-50P1-7 datasheet, AL5809-50P1-7 pinout, AL5809-50P1-7 application, or AL5809-50P1-7 equivalent, key selection criteria include its floating-ground 60V V_IN-OUT rating, thermal shutdown at +165°C, ±5% current accuracy across temperature, and compatibility with PWM dimming via external MOSFET switching at 100–200Hz.

Technical Context

The AL5809-50P1-7 integrates an internal fixed-current reference resistor and precision current mirror to deliver stable 50mA output without external components. Its LDO-based regulation block enables operation down to 2.5V V_IN-OUT, supporting long LED strings in high-voltage offline applications.

It features built-in thermal shutdown (T_SHDN = +165°C, hysteresis = +30°C), 4kV HBM ESD protection, and operates with ≤1% line regulation over 2.5V–60V input swing. The device's floating ground architecture isolates the control circuitry from system ground, enabling direct series connection with LED chains.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	50mA ±5% over -40°C to +125°C - ensures consistent LED brightness without external calibration.
V_IN-OUT Range	2.5V to 60V - supports up to 15+ white LEDs in series from 120VAC-derived rails.
Temperature Drift	20ppm/°C - maintains current stability across automotive and industrial ambient extremes.
Thermal Shutdown	+165°C with +30°C hysteresis - protects against PCB overheating during sustained high-power dissipation.
ESD Rating	4kV HBM - withstands handling and board assembly without additional protection circuitry.
Power Dissipation	1.24W (PowerDI123 on GETEK) - enables 50mA drive at up to 24.8V drop (1.24W / 0.05A) with proper thermal layout.
Min Pulse Width	t_{ON_MIN} = t_{OFF_MIN} = 500µs - defines minimum PWM dimming period for reliable on/off control at ≥2kHz effective frequency.

Pinout & Package

AL5809-50P1-7 uses the thermally robust PowerDI123 package (3.7mm × 2.8mm × 1.78mm), optimized for high-power LED driver applications with exposed cathode pad for heatsinking. Thermal resistance is θ_JA = 81.39°C/W on 50.8mm × 50.8mm GETEK PCB.

Pin/Terminal	Circuit Role	Design Meaning
In	LED current input terminal	Connects to LED cathode in low-side configuration or system supply in high-side configuration; withstands up to +80V transient.
Out	LED current output terminal	Connects to LED anode in low-side or LED cathode in high-side; serves as floating reference node for internal regulation block.

Key Features

Feature	Design Value
Two-terminal simplicity	Eliminates external current-setting resistors - reduces BOM count and PCB footprint in space-constrained LED modules.
Floating ground architecture	60V isolation between IN and OUT pins - enables direct integration into high-voltage AC/DC offline LED drivers without level-shifting circuitry.
PWM dimming support	Compatible with 100–200Hz external MOSFET switching on OUT pin - delivers smooth brightness control without flicker in signage and instrumentation.
Robust thermal performance	Rated for continuous operation at +125°C ambient with 1.24W dissipation on optimized GETEK PCB - suitable for enclosed white goods and outdoor lighting.
Lead-free & green compliance	Fully RoHS-compliant, halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb) - meets global environmental regulations for consumer and industrial products.

Applications

Offline LED Lamps

LED Power Supplies

Use Scenario: Integrated into non-isolated AC/DC LED retrofit lamps replacing incandescent bulbs.

IC Role / Device Role / Timing Role: Two-terminal constant current regulator placed in series with LED string, operating directly from rectified mains.

Use Value: Enables compact, low-cost lamp designs with no transformer or optocoupler, leveraging 60V V_IN-OUT rating to handle 170V peak rectified voltage.

Use Scenario: Secondary-side current regulation in flyback or buck-derived LED power supplies.

IC Role / Device Role / Timing Role: Precision current sink stabilizing LED output despite input ripple and load transients.

Use Value: Improves current accuracy to ±5% across temperature, reducing binning requirements and enhancing luminous consistency in commercial lighting.

White Goods Illumination

LED Signs

Use Scenario: Interior cabin lighting in refrigerators, ovens, and dishwashers requiring wide temperature operation.

IC Role / Device Role / Timing Role: Constant current source driving 1–5 white LEDs in series, mounted on FR-4 PCB with thermal vias.

Use Value: Maintains stable 50mA output from -40°C freezer environments to +85°C oven proximity, eliminating brightness drift.

Use Scenario: Channel letter and architectural signage with multi-segment LED arrays.

IC Role / Device Role / Timing Role: High-side or low-side current regulator per LED string, controlled via PWM dimming interface.

Use Value: Supports 100–200Hz PWM dimming with 5–95% duty cycle range, enabling precise brightness grading without visible flicker.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AL5809-50S1-7	SOD-123 package, lower power rating (0.36W), higher θ_JA = 278°C/W	Limited to low-power indicator LEDs (<20mA equivalent dissipation); unsuitable for >30mA continuous operation in enclosed fixtures	Select only when board space is critical and thermal budget allows ≤150mW dissipation at 50mA.
NSI50010YT1G	Onsemi 50mA two-terminal driver; 40V max V_IN-OUT, ±3% accuracy, -40°C to +125°C	Lower voltage headroom limits LED string length in 120VAC applications; tighter current tolerance but reduced surge margin	Prefer where absolute current precision outweighs high-voltage robustness - e.g., battery-powered portable lighting.

Compared with AL5809-50S1-7, the -50P1-7 offers 3.5× higher power handling and superior thermal performance for sustained 50mA operation; versus NSI50010YT1G, it provides +20V higher voltage tolerance critical for offline AC/DC LED lamp reliability.

Availability

AL5809-50P1-7 is available at Aetrix Electronics and suitable for offline LED lamps, white goods illumination, and LED signage requiring stable component supply, long-lifecycle availability, and traceable sourcing for industrial production programs.

Supply support for AL5809-50P1-7 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 LED solutions for industrial, automotive, and consumer markets.

The AL5809 product line delivers cost-effective, resistorless constant current LED drivers targeting high-volume lighting applications where simplicity, thermal resilience, and wide input voltage range are essential design requirements.

FAQ

What is the maximum LED string voltage supported by AL5809-50P1-7?

The AL5809-50P1-7 supports up to 60V across its IN and OUT terminals. For a 50mA LED string with typical 3.2V per white LED, this allows up to 18 LEDs in series (60V ÷ 3.2V ≈ 18.75). Actual count depends on forward voltage variation and minimum 2.5V dropout requirement.

Can AL5809-50P1-7 be used in high-side configuration with common-anode LED arrays?

Yes. In high-side configuration, connect the LED anode to the IN pin and LED cathode to the OUT pin. The device's floating ground architecture enables direct series insertion into the high-side path without level shifters, maintaining full 60V isolation capability.

Does AL5809-50P1-7 require external capacitors or compensation networks?

No. The AL5809-50P1-7 is internally compensated and requires no external capacitors for stable operation. Its two-terminal design eliminates all external passive components - only the LED string is needed for basic functionality.

How does thermal shutdown behave under sustained overload conditions?

Thermal shutdown activates at +165°C junction temperature with +30°C hysteresis. Once triggered, the device disables current flow until junction temperature drops to +135°C, then resumes regulation. This protects against permanent damage during prolonged overvoltage or poor heatsinking.

AL5809-50P1-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: POWERDI®123

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Linear

Topology:: -

Internal Switch(s):: Yes

Number of Outputs:: 1

Voltage - Supply (Min):: 2.5V

Voltage - Supply (Max):: 60V

Voltage - Output:: 60V

Current - Output / Channel:: 50mA

Frequency:: -

Dimming:: -

Applications:: Signage

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PowerDI™ 123

AL5809-50P1-7 FAQ

1.How can I place an order for AL5809-50P1-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AL5809-50P1-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AL5809-50P1-7 reliable?

The price and inventory of AL5809-50P1-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL5809-50P1-7 is usually 5 days.

3.What payment methods are accepted for AL5809-50P1-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL5809-50P1-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AL5809-50P1-7?

AL5809-50P1-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AL5809-50P1-7 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AL5809-50P1-7?

For technical support, including AL5809-50P1-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL5809-50P1-7 requirements.

6.How does Aetrix verify that AL5809-50P1-7 is sourced from the original manufacturer or authorized distributors?

All AL5809-50P1-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AL5809-50P1-7 meets industry standards.

7.What is the process for return or replacement of AL5809-50P1-7?

All AL5809-50P1-7 units undergo pre-shipment inspection (PSI). If there is an issue with AL5809-50P1-7, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AL5809-50P1-7 part is unused and in its original packaging.

Return procedure for AL5809-50P1-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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