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Diodes Incorporated AL5812-3FF-7
- Part No.:
- AL5812-3FF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 6-UDFN Exposed Pad
- Datasheet:
-
AL5812-3FF-7.pdf
- Description:
- IC LED DRVR LIN PWM 150MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,135
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Product details
Overview
AL5812-3FF-7 from Diodes Incorporated is an adjustable linear constant-current LED driver IC with open-drain output, designed for high-side or low-side current sinking in non-isolated and isolated LED lighting systems. It delivers up to 150mA LED current with ±3% tolerance, 0.5V RSET reference voltage, and 1V–60V output swing-enabling direct drive of multi-LED strings in signage, instrumentation backlighting, and offline converters.
For engineers reviewing the AL5812-3FF-7 datasheet, AL5812-3FF-7 pinout, AL5812-3FF-7 application, or AL5812-3FF-7 equivalent, this page provides verified technical context, package-specific pin mapping (U-DFN3030-6), thermal derating data, PWM dimming implementation guidance, and real-world design trade-offs between MSOP-8EP and U-DFN3030-6 variants.
Technical Context
The AL5812 operates as a precision current sink with internal 1500× current gain ratio (ILED/IRSET), where LED current is set by ILED = 750 / RSET (Ω) - derived from fixed 0.5V RSET reference and proportional bias architecture. Its open-drain LED pin supports high-side configuration when VCC is tapped from the LED string, extending usable chain voltage beyond 60V.
Thermal shutdown activates at TJ = 155°C with 20°C hysteresis, and supply current remains stable at ≤500µA across –40°C to +125°C ambient. High PSRR (>60dB typical) and <0.25% line regulation ensure stable current under input ripple and supply variation - critical for analog-dimmed signage and industrial panel illumination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Output Voltage Swing | 60V at LED pin - enables direct drive of 15–20 white LEDs (3.0–3.5V each) without external boost stage. |
| RSET Reference Voltage | 0.5V ±2% - decouples current-setting resistor from LED path, minimizing power loss and improving accuracy vs. high-side sensing. |
| LED Current Accuracy | ±3% at TA = +25°C; ±5% over –40°C to +125°C - ensures consistent brightness across automotive and outdoor temperature ranges. |
| Thermal Shutdown Threshold | 155°C junction temperature with 20°C hysteresis - prevents thermal runaway during transient overloads or poor PCB heatsinking. |
| Supply Current | 320–400µA at +25°C; ≤500µA max - reduces quiescent load on auxiliary rails in multi-rail LED systems. |
| Package Thermal Resistance | θJA = 69°C/W (U-DFN3030-6, 51mm×51mm 2oz FR-4) - supports 1.47W continuous dissipation with proper copper area and thermal vias. |
| PWM Dimming Support | Direct RSET pin modulation - enables >1000:1 dimming ratio with external MOSFET; linearity maintained across 1–100% duty cycle (Fig. 7). |
Pinout & Package
AL5812-3FF-7 is packaged in a 3.0mm × 3.0mm U-DFN3030-6 with exposed thermal pad (EP), optimized for high-power density LED driver layouts. The package requires soldering the EP directly to a GND plane via thermal vias for effective heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Power supply input | Accepts 3.5–60V; must be decoupled with 0.1µF ceramic capacitor placed adjacent to pin to suppress switching noise and stabilize regulation. |
| RSET (Pin 3) | Current-setting reference node | Sinks 0.5V / RSET current; also serves as PWM dimming input when driven by external switch - no additional control logic required. |
| GND (Pin 4) | Ground reference | Primary return path for RSET current and internal bias; must be connected to system ground with low-inductance trace. |
| LED (Pin 6) | Open-drain current sink output | Drives LED cathode in low-side configuration or LED anode in high-side mode; rated for 60V reverse blocking and 165mA absolute max. |
| NC (Pins 2, 5) | No connection | Internally unconnected; must remain floating - not to be tied to GND, VCC, or other signals to avoid parasitic coupling. |
| EP (Exposed Pad) | Thermal interface | Not electrically active; must be soldered to solid GND copper pour with ≥4 thermal vias (0.3mm diameter) to achieve θJA = 69°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Low 0.5V RSET reference | Reduces RSET power loss to <0.25mW at 100mA, enabling use of standard 1% metal-film resistors without trimming. |
| 60V LED pin rating | Supports direct drive of long LED strings (e.g., 18× white LEDs @ 3.3V) without external FET or DC-DC stage - simplifying BOM and layout. |
| ±3% current accuracy over temp | Maintains luminance consistency across –40°C to +125°C ambient - validated for outdoor signage and industrial HMI applications. |
| Integrated thermal shutdown | Self-protects during overvoltage transients or inadequate heatsinking; automatic recovery after cooldown eliminates need for external reset circuitry. |
| U-DFN3030-6 footprint | 3.0mm × 3.0mm body with 0.95mm pitch - saves >40% board area vs. MSOP-8EP while delivering 5% lower θJA for same PCB copper area. |
Applications
| LED Signage | Instrumentation Backlighting |
|---|---|
|
Use Scenario: Outdoor channel letters and monochrome message boards requiring uniform brightness across wide temperature range and variable input voltage. IC Role / Device Role / Timing Role: Constant-current sink regulating individual LED segments; operates in low-side configuration with VCC derived from LED string for >60V support. Use Value: Eliminates need for isolated DC-DC converter per segment - reducing cost and EMI while maintaining ±3% current matching across 50+ parallel strings. |
Use Scenario: Analog meter and control panel displays using ½W white LEDs for backlighting, powered from 12V or 24V industrial rails. IC Role / Device Role / Timing Role: Linear current regulator driving 3–5 LEDs in series; configured in high-side mode to simplify routing of common-anode LED arrays. Use Value: 0.5V RSET reference minimizes voltage headroom requirement - enabling full 100mA drive even at 12.6V min rail (after 5% tolerance), extending operational range. |
| Isolated Offline Converters | Linear LED Drivers for AC Mains |
|
Use Scenario: Secondary-side LED current regulation in flyback-based offline LED drivers where primary-side feedback is unavailable or insufficiently accurate. IC Role / Device Role / Timing Role: Post-regulator current sink accepting tapped VCC from secondary winding; provides precise current despite transformer leakage and diode drop variation. Use Value: Improves total system current accuracy to ±4% (vs. ±10% typical for primary-sensing only), meeting Energy Star LM-79 lumen maintenance requirements. |
Use Scenario: Cost-sensitive, non-isolated LED lamps replacing incandescent bulbs in 120/230VAC applications using capacitive dropper front-end. IC Role / Device Role / Timing Role: Low-voltage linear driver accepting rectified and filtered DC bus (e.g., 30–50V); sinks current from LED string referenced to high-voltage rail. Use Value: 60V LED pin rating accommodates peak bus voltage plus ripple - avoiding external clamping diodes and enabling single-stage, Class C compliant designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear LED current regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL5810Q-3FF-7 | Fixed 120mA output (no RSET); identical U-DFN3030-6 package and 60V rating. | Eliminates RSET resistor and associated layout area but lacks adjustability - suitable only for fixed-brightness designs. | Select when LED binning allows fixed current and BOM simplification outweighs dimming flexibility. |
| AP3012KTR-G1 | Higher 200mA rating, 0.25V reference, but only 40V LED pin rating and SOT-23-5 package. | Limited to ≤12 white LEDs; higher thermal resistance (θJA ≈ 180°C/W) restricts use to <50mA continuous in compact layouts. | Choose only for space-constrained, low-current (<60mA), low-voltage (<40V) applications where AL5812-3FF-7's thermal performance is unnecessary. |
Compared with AL5812-3FF-7, AL5810Q-3FF-7 trades adjustability for reduced component count and identical thermal capability, while AP3012KTR-G1 sacrifices voltage range and thermal efficiency for smaller footprint - making AL5812-3FF-7 the optimal balance for 60V, 100–150mA, thermally demanding LED systems.
Availability
AL5812-3FF-7 is available at Aetrix Electronics and suitable for LED signage, instrumentation backlighting, isolated offline converters, and linear AC-mains LED drivers requiring stable component supply, extended temperature operation, and high-voltage LED string compatibility.
Supply support for AL5812-3FF-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, automotive, and consumer markets.
The AL5812 belongs to Diodes' linear LED driver product line, engineered specifically for thermally robust, high-accuracy constant-current regulation in space-constrained and high-ambient-temperature lighting applications - prioritizing simplicity, stability, and manufacturability over switching complexity.
FAQ
What is the minimum VCC voltage required for AL5812-3FF-7 to regulate 100mA LED current?
The AL5812-3FF-7 requires VCC ≥ 3.5V to maintain regulation, as specified in Recommended Operating Conditions. At 100mA LED current and 3.5V VCC, the device sustains regulation with ~2.5V headroom across its internal pass element - sufficient for stable operation with typical LED forward voltages down to 1.0V. Below 3.5V, UVLO disables output.
Can AL5812-3FF-7 drive LEDs in high-side configuration, and what are the layout implications?
Yes - AL5812-3FF-7 supports high-side drive by connecting VCC to the LED anode and grounding the LED cathode through the LED pin. This requires routing the high-voltage LED string directly to the IC's VCC and LED pins, with RSET referenced to the same ground. Layout must isolate low-voltage control traces (RSET, GND) from high-voltage nodes to prevent coupling and ensure stable dimming.
How does thermal performance differ between U-DFN3030-6 and MSOP-8EP packages at 150mA?
In identical 51mm×51mm 2oz FR-4 test conditions, the U-DFN3030-6 achieves θJA = 69°C/W versus 90°C/W for MSOP-8EP - a 23% improvement. At 150mA and 12V drop, power dissipation is ~1.8W; U-DFN3030-6 limits junction rise to ~124°C (TA = +25°C), staying within the 125°C max operating limit, whereas MSOP-8EP exceeds it without enhanced heatsinking.
Is AL5812-3FF-7 suitable for use with PWM dimming frequencies above 1kHz?
Yes - the AL5812-3FF-7 supports PWM dimming up to at least 5kHz, as confirmed by Figure 18 (500Hz) and internal bandwidth analysis. At 1kHz, RSET pin capacitance and external MOSFET gate charge introduce <1µs delay, preserving >99.5% dimming linearity. For >5kHz, minimize RSET trace length and use low-Ciss MOSFETs to avoid duty-cycle distortion.
AL5812-3FF-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 6-UDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 150mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Signage
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- U-DFN3030-6
AL5812-3FF-7 FAQ
1.How can I place an order for AL5812-3FF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AL5812-3FF-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 AL5812-3FF-7 reliable?
The price and inventory of AL5812-3FF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL5812-3FF-7 is usually 5 days.
3.What payment methods are accepted for AL5812-3FF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL5812-3FF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AL5812-3FF-7?
AL5812-3FF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AL5812-3FF-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 AL5812-3FF-7?
For technical support, including AL5812-3FF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL5812-3FF-7 requirements.
6.How does Aetrix verify that AL5812-3FF-7 is sourced from the original manufacturer or authorized distributors?
All AL5812-3FF-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 AL5812-3FF-7 meets industry standards.
7.What is the process for return or replacement of AL5812-3FF-7?
All AL5812-3FF-7 units undergo pre-shipment inspection (PSI). If there is an issue with AL5812-3FF-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 AL5812-3FF-7 part is unused and in its original packaging.
Return procedure for AL5812-3FF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AL5812-3FF-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
Infineon Technologies
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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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