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Diodes Incorporated AL8861Y-13-01
- Part No.:
- AL8861Y-13-01
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- SOT-89-5/6
- Datasheet:
-
AL8861Y-13-01.pdf
- Description:
- LED MV INT SWITCH SOT89-5 T&R 2.
- Quantity:
- Payment:
- Shipping:
Inventory:2,831
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Product details
Overview
AL8861Y-13-01 from Diodes Incorporated is a hysteresis-mode DC-DC buck LED driver IC with integrated 40V NDMOS switch, designed for constant-current driving of series-connected LEDs from 4.5V–40V input. It delivers up to 1.5A output current in SOT89-5 and MSOP-8EP packages, achieves up to 97% efficiency, and supports analog/PWM dimming via the VSET pin. Used in low-voltage industrial lighting and LED retrofit applications.
For engineers reviewing the AL8861Y-13-01 datasheet, AL8861Y-13-01 pinout, AL8861Y-13-01 application, or AL8861Y-13-01 equivalent, key selection criteria include verified 1.5A continuous output capability, 100mV ±4% current sense threshold accuracy, 0.2V shutdown threshold, 1MHz max switching frequency, and thermal protection at +150°C junction temperature.
Technical Context
The AL8861Y-13-01 operates in fixed-frequency hysteresis control mode with internal comparator thresholds set at 96–104mV on the ISENSE pin. Its integrated 40V NDMOS switch features 0.2Ω typical on-resistance and supports peak inductor currents up to 2A.
Dimming is implemented through a single multi-function VSET pin accepting either 0.3–2.5V DC (5–100% linear analog dimming) or PWM signals <500Hz (1–100% duty cycle). Soft-start time is configurable via external capacitor (1.5ms/nF), with default 0.1ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - supports wide-range DC inputs including 12VAC rectified systems and automotive battery rails. |
| Max Output Current | 1.5A - confirmed for SOT89-5 and MSOP-8EP packages per datasheet Rev. 5-2, page 4. |
| Current Sense Threshold | 100mV ±4% - sets nominal LED current via external resistor RS = 0.1Ω for 1A or 0.067Ω for 1.5A. |
| Switching Frequency | Up to 1MHz - enables compact magnetics; typical operating frequency is 250–700kHz depending on VIN, VO, and L. |
| Efficiency | Up to 97% - measured at VIN=16V, VO=9.9V (3 LEDs), L=47μH, ILED=1A per Figure 13. |
| Shutdown Threshold | ≤0.2V on VSET - reduces quiescent current to 55–100μA and disables LX switching for standby operation. |
| Thermal Protection | +150°C with +30°C hysteresis - prevents latch-up during overtemperature events; resumes operation after cooldown. |
Pinout & Package
AL8861Y-13-01 is supplied in Pb-free SOT89-5 package (5-pin, single-ended leaded), with exposed pad for thermal dissipation. θJA = 116°C/W and θJC = 24°C/W under specified PCB layout conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | 0V return path for internal circuitry and current sense amplifier; must be low-impedance connection to power ground plane. |
| 2 (ISENSE) | Current sense input | Connects to high-side current sense resistor (RS) between VIN and this pin; sets IOUTNOM = 0.1/RS. |
| 3 (VIN) | Power input | 4.5–40V DC supply input; requires ≥10μF X7R ceramic decoupling capacitor placed adjacent to pin. |
| 4 (LX) | Switch node | Drain of internal 40V NDMOS; connects to inductor and freewheeling diode anode; handles high di/dt switching transients. |
| 5 (VSET) | Multi-function control | Accepts DC voltage (0.3–2.5V) or PWM signal for dimming; <0.2V disables output; capacitor to GND adjusts soft-start time. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 40V NDMOS switch | Eliminates external MOSFET and gate driver; reduces BOM count and layout complexity while maintaining 0.2Ω RDS(on). |
| Single-pin dimming interface | VSET pin supports both analog (0.3–2.5V) and PWM (<500Hz) control without additional logic or external components. |
| Inherent open-circuit LED protection | Auto-shutdown when no LED string is connected or string opens - prevents uncontrolled LX voltage rise and device damage. |
| LED short and RS short protection | Detects shorted LED string or failed current-sense resistor and disables switching to prevent overcurrent stress. |
| High-efficiency hysteresis control | Delivers >95% efficiency across 4.5–40V input range and 3–33V LED output range without requiring compensation network. |
Applications
| LED Retrofit for Low Voltage Halogen | Low Voltage Industrial Lighting |
|---|---|
|
Use Scenario: Replacing 12V AC halogen lamps with efficient LED modules in existing track or pendant fixtures. IC Role / Device Role / Timing Role: Constant-current buck controller regulating LED string current independent of input ripple or transformer regulation. Use Value: Enables direct replacement without rewiring; supports 12VAC input via bridge rectifier and maintains stable 1.5A output despite 10% input variation. |
Use Scenario: Powering long LED strips or arrays in factory floor signage, machine vision lighting, or control panel backlighting. IC Role / Device Role / Timing Role: Primary LED current regulator with thermal foldback to sustain operation in enclosed enclosures up to +85°C ambient. Use Value: Delivers full 1.5A output with 97% efficiency at 24V input, minimizing heat buildup and enabling compact heatsinkless designs. |
| LED Backlighting | Illuminated Signs |
|
Use Scenario: Driving edge-lit or direct-lit LED arrays behind LCD panels in industrial HMIs or medical displays. IC Role / Device Role / Timing Role: Precision current source with <1% dimming linearity and fast PWM response for flicker-free brightness control. Use Value: Achieves 1000:1 dimming ratio using 100Hz PWM on VSET; soft-start eliminates turn-on flash in safety-critical displays. |
Use Scenario: Powering outdoor channel letters or architectural accent lighting powered from 24–36V DC distribution rails. IC Role / Device Role / Timing Role: Robust LED driver with open-circuit, short-circuit, and overtemperature protection for unattended operation. Use Value: Survives LED string failure without latch-up; RS short detection prevents runaway current if sense resistor fails open. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8862Q-13 | Automotive-qualified variant (AEC-Q100 Grade 1); identical electrical specs but extended -40°C to +125°C TJ range and enhanced ESD (±3kV HBM). | Required for automotive exterior lighting; not necessary for industrial indoor use where ambient ≤+85°C. | Select AL8862Q-13 only when automotive qualification or higher ESD immunity is mandated by system-level requirements. |
| MPQ4425AGU-AEC1-P | Monolithic synchronous buck LED driver with 2A output, 4.5–40V input, but uses current-mode control and requires external compensation. | Supports higher output current and tighter current regulation (±1.5%), but increases design complexity and BOM count. | Choose MPQ4425AGU-AEC1-P when >1.5A output or tighter current tolerance is required, accepting added layout and tuning effort. |
Compared with AL8861Y-13-01, AL8862Q-13 adds automotive compliance at no performance trade-off, while MPQ4425AGU-AEC1-P trades simplicity for higher current and precision-making AL8861Y-13-01 optimal for cost-sensitive, thermally constrained 1.5A LED systems.
Availability
AL8861Y-13-01 is available at Aetrix Electronics and suitable for LED retrofit for low voltage halogen, low voltage industrial lighting, and illuminated signs requiring stable component supply and long-term production continuity.
Supply support for AL8861Y-13-01 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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with focus on power management, signal integrity, and connectivity solutions.
The AL8861 belongs to Diodes' high-efficiency LED driver product line, engineered specifically for cost-effective, thermally robust constant-current LED control in non-automotive industrial and commercial lighting.
FAQ
What is the maximum recommended output current for AL8861Y-13-01?
The AL8861Y-13-01 is rated for up to 1.5A continuous output current in SOT89-5 and MSOP-8EP packages, as confirmed in the Recommended Operating Conditions table (page 4, DS39435 Rev. 5-2). This assumes proper PCB thermal design with θJA ≤116°C/W and ambient temperature ≤+85°C. Exceeding 1.5A risks thermal shutdown due to OTP activation at +150°C junction temperature.
Can AL8861Y-13-01 drive multiple parallel LED strings?
No-AL8861Y-13-01 is designed exclusively for series-connected LED strings. Its high-side current sensing architecture regulates total string current, not per-string current. Driving parallel strings would cause current imbalance due to Vf mismatches, risking thermal runaway in the lowest-Vf string. For parallel configurations, separate AL8861Y-13-01 channels or a multi-channel driver like AL8863 must be used.
How does the VSET pin function during analog dimming?
During analog dimming, the VSET pin accepts a DC voltage from 0.3V to 2.5V to linearly scale output current from 5% to 100% of IOUTNOM. At 0.3V, current is ~5%; at 2.5V, it reaches 100%. Voltages below 0.2V disable the output entirely. The relationship is monotonic and verified across temperature (–40°C to +85°C), with <1% nonlinearity in the 5–100% range per Figure 19.
What protection features are built into AL8861Y-13-01?
AL8861Y-13-01 integrates LED open-circuit protection (auto-shutdown if no load detected), RS short-circuit protection (disables switching if ISENSE shorts to VIN), overtemperature protection (OTP trips at +150°C with +30°C hysteresis), and inherent current limiting (peak inductor current capped at 2A). These functions operate autonomously without external components or configuration.
AL8861Y-13-01 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-89-5/6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1.5A
- Frequency:
- 1MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight, Lighting
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-5
AL8861Y-13-01 FAQ
1.How can I place an order for AL8861Y-13-01 through Aetrix?
Please submit a Request for Quotation (RFQ) for AL8861Y-13-01 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 AL8861Y-13-01 reliable?
The price and inventory of AL8861Y-13-01 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL8861Y-13-01 is usually 5 days.
3.What payment methods are accepted for AL8861Y-13-01?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL8861Y-13-01 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AL8861Y-13-01?
AL8861Y-13-01 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AL8861Y-13-01 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 AL8861Y-13-01?
For technical support, including AL8861Y-13-01 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL8861Y-13-01 requirements.
6.How does Aetrix verify that AL8861Y-13-01 is sourced from the original manufacturer or authorized distributors?
All AL8861Y-13-01 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 AL8861Y-13-01 meets industry standards.
7.What is the process for return or replacement of AL8861Y-13-01?
All AL8861Y-13-01 units undergo pre-shipment inspection (PSI). If there is an issue with AL8861Y-13-01, 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 AL8861Y-13-01 part is unused and in its original packaging.
Return procedure for AL8861Y-13-01:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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