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al8861wt-7
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Diodes Incorporated LED Drivers, TSOT-25. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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markdownAL8861WT-7
Diodes Incorporated · LED Drivers · TSOT-25
AL8861WT-7 from Diodes Incorporated, in a TSOT-25. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | LX | output | Drain of the internal 40V NDMOS power switch. Connects to the external inductor L1 and the freewheeling Schottky diode D1 to form the buck converter switch node. Switch on-resistance is typically 0.2Ω at ILX = 100mA; leakage < 5µA. |
| 2 | GND | power_in | Device ground reference (0V). Return for internal control, driver, and bypass capacitor C1. |
| 3 | VSET | input | Multi-function On/Off, brightness control, and soft-start pin. Floating: internal ~1.4µA source pulls up to 4.5V. Drive below 0.2V to disable output; drive with 0.3V-2.5V DC for analog dimming (5%-100% linear), or with a PWM signal (<500Hz for 1%-100% linear range). A capacitor from VSET to GND extends soft-start (~1.5ms/nF; default 0.1ms). Absolute max 6V; keep below 5V in normal operation. |
| 4 | ISENSE | input | High-side current-sense input. Connect current-set resistor RS between this pin and VIN to define the nominal average LED current: IOUT(NOM) = 0.1V / RS. Mean sense threshold is 100mV (typ) with ±13% hysteresis; input current ~8µA. |
| 5 | VIN | power_in | Input supply voltage, 4.5V to 40V (absolute max 42V). Decouple to GND with a 10µF or larger X7R/X5R ceramic capacitor placed close to the device. Also serves as the high-side reference for the ISENSE current-sense resistor. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package | TSOT-25 |
| Category | LED-drv |
| Pins | 5 |
Ordering variants
AL8861WT-7AL8861WT-7Y-13AL8861WT-7MP-13
CAD (KiCad official)
- Symbol:
AL8861WT-7 - Footprint:
Package_TO_SOT_SMD:TSOT-23-5 - 3D model: TSOT-25 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Diodes Incorporated datasheet (None pp, sha256
b1b15e2023cebf87, retrieved 2026-08-17, tier: manufacturer) - Extractor:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).