EG4003C from EG Micro, 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	1OUT	output	Output of the internal first-stage op-amp (OP1). Used as the feedback node for the external gain-setting network (R2, R3, C3) driving the inverting input 1IN-.
2	1IN-	input	Inverting input of the internal first-stage op-amp (OP1). The PIR/microwave signal is AC-coupled here through C2/R2; overall analog gain A = A1A2 = (R3/R2)30 (typical 9000).
3	VC	input	Trigger-inhibit input. When V(VC) < 0.2VDD triggering is disabled and OUT is forced low; when V(VC) > 0.2VDD the trigger path is enabled and OUT follows Vs. Typically driven by a CdS/LDR divider for dusk-only operation.
4	A	input	Retrigger mode select. A='1' (tied to VDD) enables retriggerable mode (Tx timer restarts on each Vs pulse during Tx). A='0' (tied to GND) selects non-retriggerable mode. VAH=3.5 V min @VDD=5 V; VAL=1 V max @VDD=5 V.
5	GND	power_in	Device ground reference (0 V).
6	OUT	output	Active-high control signal output driving the load (relay, transistor, MCU). Drive capability ±25 mA at VDD=5 V and ±10 mA at VDD=3 V; VOH=4.5 V min @ILOAD=10 mA / VDD=5 V.
7	CT	passive	Oscillator timing node. Connect an external capacitor CT to GND and a pull-up resistor RT (>=100 kΩ) to VDD; Tosc ≈ 0.4·RT·CT·RT/(RT-20k). Example: RT=100 kΩ, CT=1 nF → Tosc≈50 μs (f≈20 kHz). Sets Tx and Ti timer periods.
8	VDD	power_in	Positive supply input, +3 V to +6 V operating range (7 V absolute max). Quiescent current typ 35 uA @3 V, 65 uA @5 V.

Key specifications

Parameter	Value
Manufacturer	EG Micro
Package	SOP-8
Category	Sensor
Pins	8

Ordering variants

Same part, different packaging or reel option.

EG4003A
EG4003B
EG4003C
EG4003D
EG4003E
EG4003F
EG4003G

CAD (KiCad official)

Symbol: EG4003C
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
`eg4003c.step`	122 KB	You want the bare part, or you mark your own boards.
`eg4003c-etched.step`	1.8 MB	You want the part with `EG4003C` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 447 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: EG Micro datasheet (14 pp, sha256 b037c27db8b148b3, 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