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Diodes Incorporated AL5819W6-7
- Part No.:
- AL5819W6-7
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- SOT-23-6
- Datasheet:
-
AL5819W6-7.pdf
- Description:
- LED LINEAR DRIVER SOT26 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:11,436
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Product details
Overview
AL5819W6-7 from Diodes Incorporated is a 36V low-dropout linear LED driver IC in SOT26 (Type SM) package, configured as an open-drain current sink with ±5% LED current accuracy at 30mA, 250mV max dropout at 60mA, and thermal foldback protection up to +165°C. It delivers constant current to single LED strings in non-isolated lighting systems requiring stable dimming via RSET or VIN modulation.
For engineers reviewing the AL5819W6-7 datasheet, AL5819W6-7 pinout, AL5819W6-7 application, or AL5819W6-7 equivalent, key selection criteria include its 36V output swing capability, RSET-based current setting (ILED = 1500/RSET), no external capacitor requirement, parallel operation support for higher current, and -40°C to +125°C operating range.
Technical Context
The AL5819W6-7 implements a bandgap-referenced current regulation architecture with internal voltage reference (1.2V typ at RSET), high PSRR, and low temperature drift (8 µA/°C typical CR_T). Its control module regulates LED current by sinking adjustable current through the LED pin while maintaining RSET voltage stability independent of LED path.
Thermal management is integrated via dual-stage protection: gradual current reduction begins at +135°C (thermal knee), reaching 37.5% of set current at +160°C, and full shutdown at +165°C with 20°C hysteresis. UVLO activates below 4V with 300mV hysteresis to prevent erratic startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Current Accuracy | ±5% @ 30mA - ensures tight binning tolerance for consistent brightness across production units |
| Max Output Voltage Swing | 36V on LED pin - enables driving long LED strings (e.g., 11× 3.3V LEDs) without boost stage |
| Dropout Voltage | 250mV max @ 60mA - minimizes power loss and heat generation compared to higher-VDO drivers |
| RSET Voltage | 1.2V typ - provides stable reference for precise current setting using standard resistor values |
| Operating Temp Range | -40°C to +125°C ambient - supports industrial and outdoor lighting environments without derating |
| ESD Protection | 5kV HBM on VIN, 2kV HBM on RSET/LED - reduces need for external TVS in cost-sensitive designs |
| Supply Current | 0.9–1.2mA @ RSET=15kΩ - enables low-quiescent-power operation in battery-backed signage |
Pinout & Package
SOT26 (Type SM) package with exposed thermal pad; 6-pin surface-mount outline measuring 2.95mm × 1.65mm × 1.10mm (L×W×H), MSL3 moisture sensitivity, matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connection | Unbonded die pad - must remain floating; no routing or solder mask opening required |
| 2 (GND) | Ground Reference | Primary return path for RSET bias current and LED sink current; connects to thermal pad for heat dissipation |
| 3 (RSET) | Current Setting Input | Accepts 1.2V reference; ILED = 1500/RSET (Ω); also accepts PWM signal for analog/digital dimming |
| 4 (VIN) | Power Supply Input | Supports 5–36V input; powers internal circuitry; ESD-hardened (5kV HBM) for robustness in noisy environments |
| 5 (NC) | No Connection | Unbonded die pad - must remain floating; no electrical or thermal connection |
| 6 (LED) | Current Sink Output | Open-drain output capable of 36V swing; sinks up to 100mA; low VDO reduces self-heating |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable LED current via single resistor | RSET sets ILED from 5–100mA with 1.2V reference - eliminates need for precision DAC or microcontroller |
| Thermal fold-back with OTP shutdown | Gradual current reduction from +135°C, full shutdown at +165°C - prevents thermal runaway in enclosed fixtures |
| Dual dimming interface | Supports both VIN-level PWM (supply modulation) and RSET-level PWM (current reference modulation) - offers flexibility in system architecture |
| Parallel operation capability | Multiple AL5819W6-7 devices can be connected in parallel to scale output current - simplifies high-current design without external current-sharing circuitry |
| No external capacitor required | Stable operation without bypass or compensation caps - reduces BOM count and PCB area in space-constrained modules |
Applications
| Architectural Lighting | Retail Refrigeration Lighting |
|---|---|
|
Use Scenario: Linear LED strips mounted along building façades and interior feature walls, powered from centralized 24V DC rails. IC Role / Device Role / Timing Role: Constant-current sink regulating individual strip segments; operates in non-isolated configuration with VIN tied to LED anode rail. Use Value: 36V output swing allows direct drive of 8–10 white LEDs per channel without voltage boosting; ±5% current accuracy ensures uniform luminance across architectural zones. |
Use Scenario: LED backlighting inside commercial refrigerator and freezer display cases, where ambient temperatures range from -20°C to +40°C. IC Role / Device Role / Timing Role: Temperature-stable current regulator maintaining consistent brightness despite cold-temperature VF shifts in blue-pump LEDs. Use Value: -40°C to +125°C operating range and low thermal drift (8 µA/°C) eliminate brightness droop in sub-zero environments; 250mV dropout minimizes self-heating in thermally constrained enclosures. |
| Channel Letter Signage | Vending Machine Illumination |
|
Use Scenario: Outdoor illuminated channel letters using high-brightness white LEDs, powered from 12V or 24V battery-backed supplies. IC Role / Device Role / Timing Role: Open-drain current sink enabling common-anode topology; RSET pin used for 0–100% PWM dimming synchronized to motion sensors. Use Value: RSET-based PWM dimming achieves >1000:1 contrast ratio without color shift; 5kV HBM on VIN protects against ESD events during field servicing. |
Use Scenario: Product illumination inside glass-front vending machines, where LEDs are mounted behind acrylic panels and powered from 12V SMPS. IC Role / Device Role / Timing Role: Low-noise linear driver replacing switching alternatives to avoid EMI interference with coin acceptors and wireless telemetry modules. Use Value: No external capacitor requirement eliminates ripple-induced flicker; high PSRR suppresses supply noise from shared 12V rail, ensuring stable light output during motor actuation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL5809W6-7 | Lower 24V max output voltage; 100mA max current; same SOT26 package and RSET interface | Limited to ≤7-LED strings; unsuitable for 36V architectural or signage applications | Select when supply voltage is capped at 24V and thermal budget is tighter due to lower power dissipation |
| NSI50010YT1G | Fixed 100mA output; no RSET adjustment; TO-252 package; higher 1.2V dropout at 100mA | Requires fixed-current design; lacks dimming flexibility; larger footprint and higher thermal resistance (θJA = 65°C/W) | Choose for cost-sensitive, high-volume applications where current trim and compact size are secondary to BOM simplicity |
Compared with AL5809W6-7, the AL5819W6-7 extends voltage headroom for longer LED chains; versus NSI50010YT1G, it trades fixed-current simplicity for programmability, smaller footprint, and superior thermal performance in SOT26.
Availability
AL5819W6-7 is available at Aetrix Electronics and suitable for architectural lighting, retail refrigeration systems, and channel letter signage requiring stable component supply, extended temperature operation, and reliable dimming performance.
Supply support for AL5819W6-7 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 AL5819 belongs to Diodes' linear LED driver product line, engineered specifically for cost-effective, thermally robust constant-current regulation in non-isolated LED lighting systems where EMI, size, and design simplicity are critical.
FAQ
What is the minimum RSET value for stable operation at 100mA?
The datasheet specifies RSET = 15kΩ for 100mA operation (ILED = 1500/RSET). At this value, dropout voltage remains ≤400mV, thermal fold-back initiates above +135°C, and supply current stays within 0.9–1.2mA. Using RSET < 15kΩ risks exceeding absolute maximum ratings and invalidates guaranteed accuracy.
Can AL5819W6-7 drive multiple parallel LED strings?
No - the AL5819W6-7 is designed as a single-string current sink. To drive multiple independent strings, one device per string is required. However, multiple AL5819W6-7 units can be paralleled at their VIN and GND pins to increase total output current capacity while sharing a common RSET resistor.
How does thermal fold-back affect LED brightness in high-ambient environments?
At junction temperatures above +135°C, LED current decreases linearly: at +160°C, output drops to 37.5% of nominal; full shutdown occurs at +165°C. This preserves LED lifetime and prevents catastrophic failure but causes measurable brightness reduction - design must ensure heatsinking maintains TJ ≤ +125°C under worst-case ambient and power conditions.
Is AL5819W6-7 qualified for automotive applications?
The AL5819W6-7 is not AEC-Q100 qualified. Diodes states that automotive-grade variants require specific change control, PPAP capability, and IATF 16949 manufacturing - customers needing automotive compliance must contact Diodes directly for qualified part numbers, as AL5819W6-7 is intended for industrial and commercial lighting only.
AL5819W6-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 5V
- Voltage - Supply (Max):
- 36V
- Voltage - Output:
- 0.1V ~ 36V
- Current - Output / Channel:
- 100mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- LED Lighting
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-26
AL5819W6-7 FAQ
1.How can I place an order for AL5819W6-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AL5819W6-7 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 AL5819W6-7 reliable?
The price and inventory of AL5819W6-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL5819W6-7 is usually 5 days.
3.What payment methods are accepted for AL5819W6-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL5819W6-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AL5819W6-7?
AL5819W6-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AL5819W6-7 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 AL5819W6-7?
For technical support, including AL5819W6-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL5819W6-7 requirements.
6.How does Aetrix verify that AL5819W6-7 is sourced from the original manufacturer or authorized distributors?
All AL5819W6-7 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 AL5819W6-7 meets industry standards.
7.What is the process for return or replacement of AL5819W6-7?
All AL5819W6-7 units undergo pre-shipment inspection (PSI). If there is an issue with AL5819W6-7, 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 AL5819W6-7 part is unused and in its original packaging.
Return procedure for AL5819W6-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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