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Diodes Incorporated AL5809-20S1-7
- Part No.:
- AL5809-20S1-7
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- SOD-123
- Datasheet:
-
AL5809-20S1-7.pdf
- Description:
- IC LED DRVR LIN PWM 20MA SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:46,807
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Product details
Overview
AL5809-20S1-7 from Diodes Incorporated is a two-terminal constant current linear LED driver in SOD-123 package, delivering precisely 20mA ±5% over −40°C to +125°C, with 2.5V–60V input-output voltage range and 20ppm/°C temperature drift. It supports both high-side and low-side LED string configurations for offline LED lamps and instrumentation illumination.
For engineers reviewing the AL5809-20S1-7 datasheet, AL5809-20S1-7 pinout, AL5809-20S1-7 application, or AL5809-20S1-7 equivalent, key selection criteria include fixed-current accuracy across wide voltage/temperature ranges, thermal shutdown at +165°C, minimum on/off pulse width (500µs), and compatibility with PWM dimming at 100–200Hz.
Technical Context
The AL5809-20S1-7 integrates an internal low-dropout regulator powering a precision current mirror circuit that references a factory-trimmed resistor to deliver 20mA output. Its floating-ground architecture enables bidirectional placement-IN connected to LED cathode (low-side) or OUT connected to LED anode (high-side)-with 60V voltage rating between terminals.
It features thermal shutdown activation at +165°C with +30°C hysteresis, and maintains ±5% current regulation across VIN-OUT = 2.5V–60V and TA = −40°C to +125°C. Line regulation is ≤1% over full voltage range, and startup occurs at ≥1.5V minimum power-up voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Output Current | 20mA ±5% - factory-trimmed, no external resistor required |
| Input-Output Voltage Range | 2.5V to 60V - supports long LED strings in offline AC/DC applications |
| Temperature Drift | 20ppm/°C - ensures stable current across industrial temperature range |
| Thermal Shutdown Threshold | +165°C with +30°C hysteresis - protects against sustained overtemperature |
| Minimum Pulse Width | 500µs ON / 500µs OFF - defines usable PWM dimming frequency lower bound |
| ESD Protection | 4kV HBM - meets standard handling requirements for board assembly |
| Operating Ambient Range | −40°C to +125°C - qualified for white goods and outdoor signage environments |
Pinout & Package
SOD-123 surface-mount package with 2.65mm × 1.55mm footprint, 0.3mm nominal height, and thermally enhanced cathode pad layout per Diodes Inc. recommended pad dimensions (X=0.90mm, X1=4.05mm, Y=0.95mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| In | Current Input Terminal | Connects to LED cathode in low-side configuration or system supply in high-side configuration |
| Out | Current Output Terminal | Connects to LED anode in low-side configuration or LED cathode in high-side configuration |
Key Features
| Feature | Design Value |
|---|---|
| Two-terminal topology | Eliminates need for external current-setting resistor and ground reference trace |
| High-side/low-side flexibility | Enables single BOM part to serve both LED string topologies without redesign |
| 60V IN-OUT rating | Withstands peak voltages in non-isolated offline LED drivers without clamping circuitry |
| PWM dimming support | Validated operation at 100–200Hz with 5–95% duty cycle range using external MOSFET switch |
| Lead-free & halogen-free | Complies with RoHS 2 and Diodes Inc.'s "Green" definition (<900ppm Br/Cl, <1000ppm Sb) |
Applications
| Offline LED Lamps | LED Power Supplies |
|---|---|
|
Use Scenario: Non-isolated AC/DC LED retrofit lamps operating directly from rectified mains (e.g., GU10, E27 base). IC Role / Device Role / Timing Role: Constant current regulator placed in series with LED string, acting as programmable current sink/source. Use Value: Delivers stable 20mA drive despite 100–277VAC input variation and ambient temperature swings from −25°C to +85°C. |
Use Scenario: Secondary-side constant current stage in flyback or buck-derived LED drivers for commercial lighting. IC Role / Device Role / Timing Role: Precision current source replacing discrete transistor/resistor solutions in low-power auxiliary outputs. Use Value: Reduces bill-of-materials count by eliminating trim potentiometers and improves long-term current stability vs. Zener-based bias networks. |
| White Goods Illumination | Instrumentation Panel Lighting |
|
Use Scenario: Interior cabin lighting in refrigerators, dishwashers, and ovens where space and thermal constraints limit heatsink area. IC Role / Device Role / Timing Role: Low-profile, thermally robust current regulator driving 1–3 white LEDs in confined PCB layouts. Use Value: SOD-123 package enables mounting on small copper pads with thermal vias, sustaining 20mA at +105°C ambient without derating. |
Use Scenario: Backlighting for analog/digital instrument clusters in automotive and industrial control panels. IC Role / Device Role / Timing Role: High-reliability current source providing flicker-free illumination under variable battery voltage (11.4–12.6V). Use Value: Maintains ±5% current accuracy across cold-crank (−40°C) to hot-soak (+125°C) conditions, ensuring consistent brightness and color point. |
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 |
|---|---|---|---|
| AL5809-20P1-7 | Same 20mA current, but in PowerDI123 package with higher power dissipation (1.24W vs. 0.36W) and lower θJA (81.4°C/W vs. 278.4°C/W) | Required where >100mW continuous power dissipation occurs (e.g., 12V input driving 2×3.2V LEDs) | Select when thermal margin is constrained and PCB layout allows larger footprint. |
| NSI45020AZT1G | 20mA ±3%, wider 2.5–45V range, but only rated to +105°C ambient and lacks thermal shutdown | Suitable for lower-temperature consumer lighting, not for white goods or automotive under-hood use | Choose only if tighter initial accuracy is prioritized over thermal protection and extended temperature range. |
Compared with AL5809-20P1-7, the SOD-123 variant trades thermal performance for compactness and cost; versus NSI45020AZT1G, it adds critical thermal safety and broader ambient qualification at minor accuracy concession.
Availability
AL5809-20S1-7 is available at Aetrix Electronics and suitable for offline LED lamps, white goods illumination, and instrumentation panel lighting requiring stable component supply across industrial temperature ranges and multi-year production cycles.
Supply support for AL5809-20S1-7 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 driver solutions for industrial and consumer markets.
The AL5809 product line delivers cost-effective, resistorless constant current regulation for LED lighting systems, targeting applications where simplicity, thermal resilience, and wide-input-voltage capability are essential.
FAQ
Can AL5809-20S1-7 be used in high-side configuration with reverse polarity protection?
No. The AL5809-20S1-7 has no built-in reverse polarity protection. In high-side configuration, the IN pin connects to the positive rail and OUT to the LED anode; applying reverse voltage across IN–OUT exceeds the −0.3V absolute maximum rating and risks permanent damage. External series diode or TVS is required for reverse polarity robustness.
What is the minimum LED string voltage required for stable operation?
The AL5809-20S1-7 requires ≥2.5V across its IN–OUT terminals to regulate. For a 20mA LED string, this means the total forward voltage must be ≤(VIN − 2.5V). With a 12V supply, up to four 2.8V white LEDs (11.2V total) can be driven while maintaining 0.8V headroom for regulation.
How does thermal shutdown behave during PWM dimming?
Thermal shutdown activates based on junction temperature, not instantaneous power. During PWM dimming, average power drops, delaying thermal trip. However, if peak current causes localized heating exceeding +165°C before thermal mass equalizes, shutdown may occur. Layout with thermal vias and copper pour is essential to maintain safe TJ under pulsed loads.
Is AL5809-20S1-7 compatible with DALI or 0–10V analog dimming?
No. The AL5809-20S1-7 supports only PWM dimming via external switching of the OUT pin. It lacks analog control inputs or digital communication interfaces. For DALI or 0–10V dimming, a separate controller IC must modulate the PWM signal applied to the AL5809's OUT path.
AL5809-20S1-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-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:
- 20mA
- Frequency:
- -
- Dimming:
- -
- Applications:
- Signage
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
AL5809-20S1-7 FAQ
1.How can I place an order for AL5809-20S1-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AL5809-20S1-7 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 AL5809-20S1-7 reliable?
The price and inventory of AL5809-20S1-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL5809-20S1-7 is usually 5 days.
3.What payment methods are accepted for AL5809-20S1-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL5809-20S1-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AL5809-20S1-7?
AL5809-20S1-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AL5809-20S1-7 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 AL5809-20S1-7?
For technical support, including AL5809-20S1-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL5809-20S1-7 requirements.
6.How does Aetrix verify that AL5809-20S1-7 is sourced from the original manufacturer or authorized distributors?
All AL5809-20S1-7 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 AL5809-20S1-7 meets industry standards.
7.What is the process for return or replacement of AL5809-20S1-7?
All AL5809-20S1-7 units undergo pre-shipment inspection (PSI). If there is an issue with AL5809-20S1-7, 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 AL5809-20S1-7 part is unused and in its original packaging.
Return procedure for AL5809-20S1-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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