L1527 from WL, in a SOP-8. 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	OSCI	input	Single-ended oscillator input. Connect an external oscillator resistor from this pin to VCC to set the encoding bit-width / working frequency (see resistor-vs-code-width table, e.g. 47 kΩ ≈ 287 µs @ 3 V up to 560 kΩ ≈ 2.83 ms @ 12 V).
2	VDD	power_in	Positive supply. Operating range 2.0 V to 12 V (absolute max 12 V, abs-min -0.3 V). Static current typ 0.01 µA (< 0.1 µA) with all keys open; operating current typ 0.2 mA (max 1.0 mA) with any Kx high.
3	GND	power_in	Negative supply / ground reference.
4	DAT	output	Serial encoded data output. Frame = sync + 20-bit address (C0..C19) + 4 data bits (D0..D3). Drive capability IOH ≈ 20 mA typ @ VCC=12 V (VOH=5 V), 15 mA typ @ VCC=9 V, 1.5 mA typ @ VCC=3 V. Idle low; asserts only while a key is pressed, so it can directly drive an indicator LED / NPN RF-modulator stage.
5	K0	input	Key input 0. Active-high; contains an internal 10 kΩ pull-down to GND. Drive high (through a key from VCC) to encode bit D0 in the transmitted frame.
6	K1	input	Key input 1. Active-high; contains an internal 10 kΩ pull-down to GND. Drive high to encode bit D1.
7	K2	input	Key input 2. Active-high; contains an internal 10 kΩ pull-down to GND. Drive high to encode bit D2.
8	K3	input	Key input 3. Active-high; contains an internal 10 kΩ pull-down to GND. Drive high to encode bit D3. Any Kx held for 15 s puts the chip into low-power shutdown until all keys are released.

Key specifications

Parameter	Value
Manufacturer	WL
Package	SOP-8
Category	Comm/UART
Pins	8

CAD (KiCad official)

Symbol: L1527
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`l1527.step`	122 KB	You want the bare part, or you mark your own boards.
`l1527-etched.step`	1.1 MB	You want the part with `L1527` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 280 faces against 147 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: WL datasheet (9 pp, sha256 ff2098f53e050147, retrieved 2026-08-17, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
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).

Datasheet PDF