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Diodes Incorporated AL5811FF-7
- Part No.:
- AL5811FF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 6-UDFN Exposed Pad
- Datasheet:
-
AL5811FF-7.pdf
- Description:
- IC LED DRVR LINEAR PWM 75MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,935
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Product details
Overview
AL5811FF-7 from Diodes Incorporated is a linear adjustable-current LED driver IC with 60V open-drain output capability, ±6% typical LED current tolerance at 75mA, and 0.5V RSET reference voltage enabling precise current setting via external resistor. It operates across –40°C to +125°C and supports non-isolated and isolated LED signage, instrumentation backlighting, and low-EMI constant-current LED chains.
For engineers reviewing the AL5811FF-7 datasheet, AL5811FF-7 pinout, AL5811FF-7 application, or AL5811FF-7 equivalent, this device is selected for high-voltage linear LED biasing where thermal stability, minimal overhead voltage (1.0V min VLED), and resistor-based current programming are critical - especially in space-constrained U-DFN3030-6 layouts.
Technical Context
The AL5811FF-7 implements a precision current-sink architecture with an internal 1500× current ratio between RSET pin current and LED sink current, yielding ILED = 750 / RSET (in kΩ). Its RSET pin sits outside the LED current path, eliminating IR drop error and maintaining accuracy across temperature and supply variation.
It features thermal shutdown at +155°C with +20°C hysteresis, 1.0V–60V output swing capability, and high PSRR (>60dB typical) to reject supply noise - making it suitable for direct connection to rectified AC or unregulated DC rails in offline LED converters without switching noise concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max LED Current | 75 mA - maximum regulated sink current at VCC ≥ 3.5V and TA ≤ +125°C |
| RSET Reference Voltage | 0.5 V - low-voltage bias point enabling <100 mW power loss in RSET network |
| Output Voltage Range | 1.0 V to 60 V - supports long LED strings up to ~18 white LEDs (3.3V each) or 20 red LEDs (3.0V each) |
| Current Accuracy | ±6% typical - tight tolerance maintained over –40°C to +125°C ambient without trimming |
| Supply Rejection | High PSRR - suppresses input ripple to prevent LED current modulation in unregulated supplies |
| Junction Temp Limit | +155°C thermal shutdown - protects against sustained overload or poor PCB heatsinking |
| Package Thermal Resistance | θJA = 71°C/W - enables 1.40W max dissipation on FR-4 with recommended pad layout and thermal vias |
Pinout & Package
AL5811FF-7 is housed in a 3.0 mm × 3.0 mm U-DFN3030-6 package with exposed thermal pad (EP) requiring direct GND connection for optimal thermal performance. The compact footprint supports high-density LED driver placement on lighting modules and instrument PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LED (Pin 6) | Current Sink Output | Open-drain NMOS drain terminal - connects to cathode of LED string; sinks up to 75mA with 60V compliance |
| GND (Pin 4) | Ground Reference | Primary return path for RSET current and internal bias; must connect to EP for thermal integrity |
| VCC (Pin 1) | Supply Input | Power rail input (2.0–60V); decoupled by 0.1µF ceramic capacitor placed adjacent to pin |
| RSET (Pin 3) | Current Programming Node | 0.5V reference input - sets ILED = 750/RSET (kΩ); also accepts PWM signal for dimming control |
| NC (Pins 2 & 5) | No Connect | Unbonded terminals - must remain floating; no internal circuitry connected |
| EP (Exposed Pad) | Thermal & Electrical Ground | Integral thermal path to PCB copper; must be soldered to solid GND plane with ≥4 thermal vias |
Key Features
| Feature | Design Value |
|---|---|
| Low RSET voltage (0.5V) | Minimizes power loss in current-setting resistor and reduces self-heating error in precision bias networks |
| 60V output compliance | Enables direct drive of multi-LED strings without boost or buck conversion - simplifies BOM and EMI design |
| ±6% current tolerance over temp | Eliminates need for factory calibration or trim resistors in industrial-grade LED illumination systems |
| Thermal shutdown with hysteresis | Prevents latch-up during transient overloads and ensures safe recovery without external supervision |
| U-DFN3030-6 package | Reduces board area by >50% vs. MSOP-8EP while improving thermal performance (θJA = 71°C/W) |
Applications
| LED Signage | Instrumentation Backlighting |
|---|---|
|
Use Scenario: Outdoor alphanumeric LED displays powered from 24VDC or rectified 120VAC with variable ambient temperature (-40°C to +85°C). IC Role / Device Role / Timing Role: Constant-current sink regulating individual segment or pixel current independent of forward voltage drift. Use Value: Maintains consistent brightness across LED bins and temperature without feedback loop complexity or switching noise. |
Use Scenario: Analog panel meters and medical device LCD backlights requiring flicker-free, low-noise illumination under battery or low-voltage DC operation. IC Role / Device Role / Timing Role: Low-EMI linear current source replacing charge-pump or inductive drivers near sensitive analog circuitry. Use Value: Eliminates conducted EMI that would otherwise corrupt ADC readings or disrupt sensor signal integrity. |
| Isolated Offline Converters | Architectural Accent Lighting |
|
Use Scenario: Secondary-side LED load in flyback or capacitive-drop AC/DC supplies where primary-side regulation is coarse or absent. IC Role / Device Role / Timing Role: Post-regulator ensuring stable LED current despite wide input ripple and line-frequency variation. Use Value: Compensates for ±15% transformer tolerance and diode bridge voltage drop without additional sensing components. |
Use Scenario: Low-profile architectural cove lighting using 12–24V DC distribution with long parallel LED runs requiring uniform luminance. IC Role / Device Role / Timing Role: Distributed current sink per fixture, enabling scalable, modular installation without centralized driver cabinets. Use Value: Enables single-layer PCB integration with thermal pad directly coupled to aluminum heat-spreader extrusions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear LED current regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL5810F-7 | Fixed 60mA output; no RSET pin; 0.5V dropout at rated current | Lacks programmability and PWM dimming capability; simpler BOM but inflexible current scaling | Select when fixed current suffices and board space permits slightly larger SOT-26 package |
| AP3012KTR-G1 | Adjustable 10–100mA; 1.25V reference; requires higher RSET power dissipation | Higher reference voltage increases RSET self-heating error and reduces accuracy at low currents | Prefer only if existing design uses 1.25V reference architecture and thermal margin allows |
Compared with AL5811FF-7, AL5810F-7 trades adjustability for simplicity and lower quiescent current, while AP3012KTR-G1 offers wider current range but sacrifices thermal stability and low-voltage headroom - making AL5811FF-7 optimal for precision, high-voltage, thermally constrained LED biasing.
Availability
AL5811FF-7 is available at Aetrix Electronics and suitable for LED signage, instrumentation backlighting, and isolated offline LED converters requiring stable component supply, RoHS-compliant packaging, and extended temperature operation.
Supply support for AL5811FF-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 AL5811 belongs to Diodes' linear LED driver product line, engineered specifically for low-noise, high-voltage constant-current biasing in space- and thermal-constrained lighting applications without switching components.
FAQ
What is the minimum VCC voltage required for full 75mA LED current?
The AL5811FF-7 delivers its full 75mA LED current only when VCC ≥ 3.5V. Below 3.5V, maximum LED current is limited to 50mA per datasheet Section "Recommended Operating Conditions" (Note 9). This restriction ensures sufficient headroom for internal regulation and thermal safety at elevated ambient temperatures.
Can AL5811FF-7 drive LED strings exceeding 60V?
Yes - by tapping VCC from the LED string itself (high-side configuration), the AL5811FF-7 can regulate current in strings >60V, provided PWM dimming is not used. In this topology, the device's VCC pin is powered from the anode end of the chain, shifting the voltage burden away from the IC's absolute maximum ratings while maintaining accurate current regulation.
How does the RSET pin enable PWM dimming?
The RSET pin accepts a pulsed voltage signal: when pulled below ~0.2V via external MOSFET switch, the internal current reference is disabled, turning off LED current. At 100Hz PWM, dimming linearity remains within ±5% across 0.1–100% duty cycle, as verified in Figure 6 of the datasheet - no external compensation or filtering is required.
Why is the exposed pad (EP) mandatory for grounding?
The EP is electrically connected to the die substrate and serves as the primary thermal conduction path. Leaving it unconnected raises θJA by >40°C/W and risks thermal shutdown at <50% of rated power. Diodes Incorporated specifies direct GND soldering with ≥4 thermal vias to maintain junction temperature ≤125°C under continuous 75mA operation.
AL5811FF-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 6-UDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 3.5V
- Voltage - Supply (Max):
- 60V
- Voltage - Output:
- 1V ~ 60V
- Current - Output / Channel:
- 75mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Signage
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- U-DFN3030-6
AL5811FF-7 FAQ
1.How can I place an order for AL5811FF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AL5811FF-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 AL5811FF-7 reliable?
The price and inventory of AL5811FF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL5811FF-7 is usually 5 days.
3.What payment methods are accepted for AL5811FF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL5811FF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AL5811FF-7?
AL5811FF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AL5811FF-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 AL5811FF-7?
For technical support, including AL5811FF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL5811FF-7 requirements.
6.How does Aetrix verify that AL5811FF-7 is sourced from the original manufacturer or authorized distributors?
All AL5811FF-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 AL5811FF-7 meets industry standards.
7.What is the process for return or replacement of AL5811FF-7?
All AL5811FF-7 units undergo pre-shipment inspection (PSI). If there is an issue with AL5811FF-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 AL5811FF-7 part is unused and in its original packaging.
Return procedure for AL5811FF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AL5811FF-7 Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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