eV1527 from Vollgo, 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	OSC	passive	Oscillator resistor input. Connect an external resistor (recommended 330 kΩ) from this pin to VCC to set the internal oscillator frequency (typ. Fop = 80 kHz). Timing/delay varies with Rosc per the datasheet resistor table.
2	VCC	power_in	Positive supply rail. Operating range 3.0 V to 13 V (absolute max 14 V). Operating current ~0.5 mA typ; static current <1.0 µA (OSC stopped, output unloaded).
3	GND	power_in	Ground / negative supply reference (0 V) for the device.
4	TXD	output	Serial encoded data output. Transmits the sync bit, the 20-bit pre-burned ID code (C0-C19) and the 4 data bits (D0-D3) mapped from K0-K3. Source current Ioh ≥ 5 mA and sink current Iol ≥ 3 mA at VCC=12 V, VO=6 V.
5	K0	input	Key/trigger input 0 with internal pull-down resistor. Active-high; drive high (e.g. via a button to VCC) to transmit code with D0=1. Any K0-K3 asserted initiates a transmission frame on TXD.
6	K1	input	Key/trigger input 1 with internal pull-down resistor. Active-high; drive high to transmit code with D1=1. K0-K3 may be combined for up to 15 unique key codes (see K0-K3 combination table).
7	K2	input	Key/trigger input 2 with internal pull-down resistor. Active-high; drive high to transmit code with D2=1. Combine with K0/K1/K3 for multi-key codes.
8	K3	input	Key/trigger input 3 with internal pull-down resistor. Active-high; drive high to transmit code with D3=1. Combine with K0/K1/K2 for multi-key codes.

Key specifications

Parameter	Value
Manufacturer	Vollgo
Package	SOP-8
Category	Logic
Pins	8

CAD (KiCad official)

Symbol: eV1527
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
`ev1527.step`	122 KB	You want the bare part, or you mark your own boards.
`ev1527-etched.step`	1.3 MB	You want the part with `eV1527` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 328 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: Vollgo datasheet (8 pp, sha256 d461c195773d69f8, retrieved 2026-08-17, tier: lcsc)
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