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Diodes Incorporated AL8861Y-13
- Part No.:
- AL8861Y-13
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- SOT-89-5/6
- Datasheet:
-
AL8861Y-13.pdf
- Description:
- IC LED DRV RGLTR PWM SOT89-5
- Quantity:
- Payment:
- Shipping:
Inventory:12,131
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Product details
Overview
AL8861Y-13 from Diodes Incorporated is a hysteresis-mode DC-DC buck LED driver IC with integrated 40V NDMOS switch, designed to drive series-connected LEDs from 4.5V–40V input while delivering up to 1.5A output current in SOT89-5 and MSOP-8EP packages. It features single-pin analog/PWM dimming via VSET, ±13% current sense hysteresis, and inherent open-circuit/short-circuit LED protection for industrial lighting and retrofit applications.
For engineers reviewing the AL8861Y-13 datasheet, AL8861Y-13 pinout, AL8861Y-13 application, or AL8861Y-13 equivalent, key selection criteria include verified 1.5A continuous output capability in SOT89-5, 100mV nominal current sense threshold with ±4% tolerance, 1MHz max switching frequency, thermal shutdown at +150°C, and dual dimming interface compatibility (0.3–2.5V analog / <500Hz PWM).
Technical Context
The AL8861Y-13 operates in fixed-frequency hysteresis control mode, using internal high-side current sensing to regulate average LED current via external RS resistor (IOUTNOM = 0.1/RS). Its comparator monitors voltage across RS against 100mV ±4% reference with ±13% hysteresis to determine switch on/off timing.
Dimming is implemented through the VSET pin: DC voltage (0.3–2.5V) enables linear 5–100% analog control, while low-frequency PWM (<500Hz) provides 1–100% digital dimming with <1% accuracy. Soft-start is externally adjustable via capacitor from VSET to GND (1.5ms/nF), with default time of 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 variations. |
| Max Output Current | 1.5A - confirmed for SOT89-5 and MSOP-8EP packages; enables driving high-brightness LED strings up to 40W. |
| Current Sense Threshold | 100mV ±4% - sets nominal LED current via external RS resistor; enables ±5% output current accuracy over temperature. |
| Switching Frequency | Up to 1MHz - allows compact magnetics design; typical operating frequency is 250kHz at VIN=16V, VO=9.6V (3 LEDs). |
| Efficiency | Up to 97% - achieved with integrated 40V NDMOS switch and optimized gate drive; peak efficiency occurs at mid-load conditions. |
| Thermal Protection | +150°C OTP with +30°C hysteresis - prevents latch-up during overload; junction-to-ambient θJA is 116°C/W (SOT89-5) and 56°C/W (MSOP-8EP). |
| VSET Control Range | 0.3V–2.5V analog / 0–100% PWM - single-pin interface supports both precision analog dimming and noise-immune digital control. |
Pinout & Package
Packaged in Pb-free SOT89-5 (5-pin) and MSOP-8EP (8-pin with exposed pad), AL8861Y-13 uses thermally enhanced layouts for 1.5A operation. Pin functions are validated per Diodes DS39435 Rev. 5–2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX | Drain of internal NDMOS switch | High-current switching node; connects to inductor and freewheeling diode anode; requires low-inductance layout. |
| GND | Power and signal ground reference | Dual ground pins in SOT89-5 (pins 2,3) and MSOP-8EP (pins 2,3,6); critical for stable current sensing and thermal dissipation. |
| VIN | Main power input | Accepts 4.5–40V; must be decoupled with ≥10μF X7R ceramic capacitor placed adjacent to pin 5 (SOT89-5) or pin 8 (MSOP-8EP). |
| ISENSE | Current sense input | Connects to RS resistor between VIN and this pin; senses 100mV drop to set IOUTNOM = 0.1/RS. |
| VSET | Multi-function dimming/control pin | Enables ON/OFF (≤0.2V), analog dimming (0.3–2.5V), PWM dimming (open-drain compatible), and soft-start (capacitor to GND). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 40V NDMOS switch | Eliminates external MOSFET; reduces BOM count and PCB area while enabling 1.5A continuous output in thermally optimized packages. |
| Single-pin dimming interface | VSET accepts both DC voltage (0.3–2.5V) and PWM signals (<500Hz), simplifying system-level brightness control without additional logic. |
| Inherent LED protection | Automatically disables output during open-circuit LED condition or RS short, preventing damage without external fault detection circuitry. |
| Adjustable soft-start | Capacitor from VSET to GND adds ~1.5ms/nF delay; suppresses inrush current and improves PWM dimming accuracy at startup. |
| High-efficiency hysteresis control | Delivers up to 97% efficiency by minimizing switching losses and leveraging fast internal comparator response (<45ns propagation delay). |
Applications
| LED Retrofit for Low Voltage Halogen | Low Voltage Industrial Lighting |
|---|---|
|
Use Scenario: Replacing 12V AC halogen lamps with efficient LED modules in commercial track lighting and display fixtures. IC Role / Device Role / Timing Role: Buck LED driver providing constant-current regulation and analog dimming compatibility with legacy TRIAC dimmers via DC offset translation. Use Value: Enables direct replacement with 1.5A output supporting multi-LED strings, while inherent open-circuit protection prevents failure when individual LEDs fail open. |
Use Scenario: Powering ruggedized LED luminaires in factory environments with unstable 24V DC supply rails and wide ambient temperature swings (−40°C to +85°C). IC Role / Device Role / Timing Role: Primary LED current controller with overtemperature protection and RS short detection, ensuring safe operation under brownout and thermal stress. Use Value: 116°C/W θJA in SOT89-5 package sustains 1.5A output across full industrial temperature range without derating. |
| LED Backlighting | Illuminated Signs |
|
Use Scenario: Driving edge-lit LCD backlights in kiosks and point-of-sale displays requiring uniform brightness and flicker-free dimming. IC Role / Device Role / Timing Role: Constant-current source with PWM dimming support at 100–500Hz, synchronized to display refresh rates to eliminate visible artifacts. Use Value: <1% dimming accuracy at 1% duty cycle ensures smooth grayscale transitions and eliminates banding in low-brightness modes. |
Use Scenario: Powering outdoor channel letters and architectural signage with long LED strings subjected to voltage drop over extended wiring runs. IC Role / Device Role / Timing Role: High-input-voltage buck regulator (up to 40V) maintaining stable 1.5A output despite 10–15% line loss from remote power supplies. Use Value: 4.5–40V input range accommodates 24V/36V/48V nominal systems; integrated 40V switch avoids external TVS requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8861Q-13 | Automotive-grade variant with AEC-Q100 qualification; identical electrical specs but qualified for −40°C to +125°C junction operation. | Required for automotive exterior lighting; not necessary for industrial or commercial indoor use. | Select AL8861Q-13 only when automotive qualification or extended junction temperature range is mandatory. |
| MPQ4425AGU-AEC1-P | Monolithic 2A buck LED driver with I²C interface; higher current rating but requires digital control bus and external current sense amplifier. | Suitable for smart lighting systems needing programmable current profiles; incompatible with analog-dimming-only designs. | Choose MPQ4425AGU-AEC1-P only if I²C configurability and >1.5A output are required; increases BOM and firmware complexity. |
Compared with AL8861Y-13, AL8861Q-13 adds automotive qualification without changing electrical behavior, while MPQ4425AGU-AEC1-P trades analog simplicity for digital flexibility and higher current-making AL8861Y-13 optimal for cost-sensitive, analog-dimming-focused industrial LED systems.
Availability
AL8861Y-13 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 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 ICs, specializing in power management, signal integrity, and LED lighting solutions with ISO/TS 16949 and ISO 14001 certifications.
The AL8861 belongs to Diodes' high-efficiency LED driver product line, engineered specifically for cost-sensitive, thermally constrained constant-current LED applications requiring minimal external components and robust protection features.
FAQ
What is the maximum continuous output current supported by AL8861Y-13?
The AL8861Y-13 delivers up to 1.5A continuous output current when packaged in SOT89-5 or MSOP-8EP configurations, as confirmed in the Recommended Operating Conditions table (DS39435 Rev. 5–2, page 4). This rating assumes proper PCB thermal design: 1"×1" FR-4 board with 2oz copper for SOT89-5 (θJA = 116°C/W) and 2"×2" board for MSOP-8EP (θJA = 56°C/W). The TSOT25 variant is limited to 1A.
How does the VSET pin enable both analog and PWM dimming?
The VSET pin accepts either a DC voltage (0.3–2.5V) for linear analog dimming across 5–100% of nominal current, or a low-frequency PWM signal (<500Hz) for digital control with 1–100% resolution. Internally, it drives the hysteresis comparator's reference level; voltage below 0.2V forces shutdown, while floating VSET defaults to 4.5V via internal 1.4µA pull-up, enabling full output.
What protection features are integrated into AL8861Y-13?
The AL8861Y-13 integrates LED open-circuit protection (disables output if no current path exists), RS short-circuit protection (detects zero resistance across sense resistor), overtemperature protection (shuts down at +150°C with +30°C hysteresis), and inherent current limiting (peak inductor current capped at 2A). These operate autonomously without external components or configuration.
Which package options are available for AL8861Y-13 and how do they differ thermally?
AL8861Y-13 is offered in SOT89-5 (θJA = 116°C/W) and MSOP-8EP (θJA = 56°C/W) packages, both rated for 1.5A continuous output. The MSOP-8EP's lower thermal resistance enables higher ambient temperature operation or reduced heatsinking, while SOT89-5 offers simpler assembly and smaller footprint. TSOT25 is limited to 1A and not used in the Y-13 suffix variant.
AL8861Y-13 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:
- 36V
- Current - Output / Channel:
- 1.5A
- Frequency:
- 1MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight, Lighting, Signage
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-5
AL8861Y-13 FAQ
1.How can I place an order for AL8861Y-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AL8861Y-13 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 reliable?
The price and inventory of AL8861Y-13 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 is usually 5 days.
3.What payment methods are accepted for AL8861Y-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL8861Y-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AL8861Y-13?
AL8861Y-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AL8861Y-13 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?
For technical support, including AL8861Y-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL8861Y-13 requirements.
6.How does Aetrix verify that AL8861Y-13 is sourced from the original manufacturer or authorized distributors?
All AL8861Y-13 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 meets industry standards.
7.What is the process for return or replacement of AL8861Y-13?
All AL8861Y-13 units undergo pre-shipment inspection (PSI). If there is an issue with AL8861Y-13, 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 part is unused and in its original packaging.
Return procedure for AL8861Y-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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