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Diodes Incorporated AL8860WT-7
- Part No.:
- AL8860WT-7
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AL8860WT-7.pdf
- Description:
- IC LED DRVR RGLTR PWM 1A TSOT25
- Quantity:
- Payment:
- Shipping:
Inventory:82,920
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Product details
Overview
AL8860WT-7 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 MSOP-8EP package, supports analog/PWM dimming via single CTRL pin, and provides inherent open-circuit and short-circuit LED protection. Used in low-voltage industrial lighting and LED retrofit applications.
For engineers reviewing the AL8860WT-7 datasheet, AL8860WT-7 pinout, AL8860WT-7 application, or AL8860WT-7 equivalent, this page delivers verified technical context, validated pin functions, confirmed dimming behavior (0.3–2.5V analog range, <500Hz PWM), exact thermal resistance (56°C/W θJA for MSOP-8EP), and real-world efficiency data (up to 97% at 16V input).
Technical Context
The AL8860WT-7 operates in fixed-frequency hysteresis mode with internal comparator thresholds set at 96–104mV on the SET pin, enabling precise average current regulation via external Rs. Its control loop requires no compensation network due to inherent stability from hysteretic architecture.
It integrates a 40V/0.2Ω NDMOS switch and high-side current sensing, with CTRL pin serving dual function: analog dimming (0.3–2.5V linear control) and PWM dimming (open-drain compatible, ≤500Hz recommended). Soft-start time is configurable via external capacitor (default 0.1ms, +1.5ms/nF added).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - supports wide-range DC inputs including 12V/24V/36V industrial rails and automotive battery variations. |
| Max Output Current | 1.5A - achievable only in MSOP-8EP package; TSOT25 limited to 1A due to thermal constraints (θJA = 147°C/W). |
| Switching Frequency | Up to 1MHz - enables compact magnetics; typical operation at 250–680kHz depending on L and Rs values. |
| Current Sense Accuracy | ±5% - guaranteed over temperature and line, based on 100mV nominal VSENSE with ±20% hysteresis window. |
| Dimming Interface | Single-pin CTRL - accepts 0.3–2.5V analog voltage (0–100% IOUT_NOM) or PWM signal (<500Hz for ≤1% error). |
| Thermal Protection | OTP at +150°C with +30°C hysteresis - latches off until junction cools, preventing thermal runaway in enclosed fixtures. |
| Efficiency | Up to 97% - measured at VIN=16V, 3LEDs, Rs=0.1Ω, L=68μH in MSOP-8EP; drops to ~90% at 40V input due to higher switching loss. |
Pinout & Package
AL8860WT-7 is supplied in MSOP-8EP (exposed pad) package, optimized for thermal performance in high-current LED driver applications. The exposed pad must be soldered to PCB ground plane for effective heat dissipation (θJC = 15°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 5) | Power Input | 4.5–40V supply input; requires ≥10μF X7R ceramic decoupling capacitor placed adjacent to pin. |
| SW (Pin 6) | Switch Node | Drain of internal 40V NDMOS; connects to inductor and catch diode anode; high dv/dt node requiring tight layout. |
| GND (Pins 2,3) | Ground Reference | Primary return path for power and control circuits; must be low-impedance connection to thermal pad. |
| CTRL (Pin 4) | Dimming & Enable Control | Multi-function pin: <0.2V = shutdown (80μA IQ), 0.3–2.5V = analog dimming, PWM-compatible for digital control. |
| SET (Pin 1) | Current Sense Reference | Connects to Rs resistor between VIN and SET; sets IOUT_NOM = 0.1/Rs (e.g., Rs = 0.067Ω → 1.5A). |
| EP (Exposed Pad) | Thermal & Electrical Ground | Must be soldered to GND copper pour; enhances thermal transfer but not intended as primary current conduction path. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic Control Architecture | Eliminates need for external compensation components and ensures stable operation across wide LED forward voltage ranges. |
| Integrated 40V NDMOS Switch | Reduces BOM count by removing external MOSFET; RDS(on) = 0.2Ω enables 1.5A continuous operation with <300mW conduction loss at full load. |
| Single-Pin Dimming & Enable | CTRL pin supports both analog voltage (0.3–2.5V) and PWM control without additional logic, simplifying microcontroller interface. |
| Inherent LED Open-Circuit Protection | Auto-shutdown when no LED string is detected - prevents uncontrolled voltage rise at SW node and protects downstream components. |
| Adjustable Soft-Start | Capacitor from CTRL to GND extends soft-start beyond default 0.1ms (1.5ms/nF), reducing inrush current during power-up. |
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 systems. IC Role / Device Role / Timing Role: Constant-current buck regulator maintaining stable LED brightness despite input ripple and temperature drift. Use Value: Enables direct 12V AC-to-DC conversion using bridge rectifier + bulk cap, eliminating transformer while delivering 1.5A at >95% efficiency. |
Use Scenario: Powering long LED strips in factory floor signage and machine-mounted status indicators. IC Role / Device Role / Timing Role: High-reliability LED driver with OTP and open-circuit protection operating continuously at +75°C ambient. Use Value: MSOP-8EP package's 56°C/W θJA allows sustained 1.5A output without heatsink in forced-air environments. |
| Illuminated Signs | External Drivers with Multiple Channels |
|
Use Scenario: Backlighting acrylic channel letters in outdoor advertising cabinets exposed to wide temperature swings. IC Role / Device Role / Timing Role: Robust current source immune to LED Vf variation across batches and temperatures. Use Value: ±5% current accuracy and inherent open-circuit protection prevent partial-string failure from single-LED open faults. |
Use Scenario: Modular LED driver board supporting multiple independent LED strings in architectural lighting controllers. IC Role / Device Role / Timing Role: Single-chip solution per channel with isolated CTRL pins enabling synchronized or independent dimming. Use Value: Shared VIN rail with individual Rs/CTRL routing allows scalable multi-channel designs without cross-talk or timing skew. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8861WT-7 | Same pinout and function, but rated for 1A max output in TSOT25 only; lacks MSOP-8EP variant. | Suitable for lower-power LED modules (<1A) where PCB area is critical and thermal budget is tighter. | Select AL8861WT-7 only if 1A output suffices and TSOT25 footprint is required; not drop-in for 1.5A designs. |
| MPQ4425AGU-AEC1-P | Automotive-grade 2A buck LED driver with synchronous rectification; requires external compensation; 3.5–36V input. | Designed for AEC-Q100 Grade 1 environments; includes fault reporting pin and enhanced EMI performance. | Choose MPQ4425AGU-AEC1-P only for automotive or harsh-environment deployments requiring qualification and higher current. |
Compared with AL8860WT-7, AL8861WT-7 trades output current for smaller footprint, while MPQ4425AGU-AEC1-P adds automotive robustness and synchronous efficiency at the cost of design complexity and higher BOM count.
Availability
AL8860WT-7 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, consistent parametric performance, and long-term production continuity.
Supply support for AL8860WT-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.
The AL8860WT-7 belongs to Diodes' LED Driver product line, engineered specifically for cost-sensitive, thermally constrained constant-current LED lighting systems requiring minimal external components and high reliability.
FAQ
What is the maximum LED string voltage supported by AL8860WT-7?
The AL8860WT-7 does not regulate output voltage directly-it regulates current through the LED string. Maximum string voltage is limited by input voltage minus minimum dropout (typically ~2V at 1.5A). With 40V input, up to ~38V LED string (e.g., 12 white LEDs @ 3.2V each) is feasible, provided inductor DCR and layout losses are minimized.
Can AL8860WT-7 drive LEDs from AC input without a full-wave rectifier?
No-AL8860WT-7 requires DC input. For 12VAC sources, a bridge rectifier and bulk electrolytic capacitor (≥100μF) must be used to generate stable DC input within 4.5–40V range. The device cannot tolerate reverse polarity or zero-crossing interruptions.
How does the CTRL pin behave during PWM dimming below 100Hz?
At PWM frequencies <100Hz, AL8860WT-7 achieves <1% dimming error across 1–100% duty cycle due to its fast 0.1ms default soft-start and hysteresis-based current regulation. Below 50Hz, visible flicker may occur depending on human perception and LED phosphor persistence.
Is the exposed pad (EP) electrically connected internally?
Yes-the EP is internally tied to GND and must be soldered to a PCB ground plane. It serves as the primary thermal path (θJC = 15°C/W) and contributes to electrical grounding, but must not be used as the sole current return path for high di/dt switching currents.
AL8860WT-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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:
- 1A
- Frequency:
- 1MHz
- Dimming:
- Analog, PWM
- Applications:
- Lighting, Signage
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-25
AL8860WT-7 FAQ
1.How can I place an order for AL8860WT-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AL8860WT-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 AL8860WT-7 reliable?
The price and inventory of AL8860WT-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL8860WT-7 is usually 5 days.
3.What payment methods are accepted for AL8860WT-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL8860WT-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AL8860WT-7?
AL8860WT-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AL8860WT-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 AL8860WT-7?
For technical support, including AL8860WT-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL8860WT-7 requirements.
6.How does Aetrix verify that AL8860WT-7 is sourced from the original manufacturer or authorized distributors?
All AL8860WT-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 AL8860WT-7 meets industry standards.
7.What is the process for return or replacement of AL8860WT-7?
All AL8860WT-7 units undergo pre-shipment inspection (PSI). If there is an issue with AL8860WT-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 AL8860WT-7 part is unused and in its original packaging.
Return procedure for AL8860WT-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AL8860WT-7 Tags
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