BU4052BCF-E2 from ROHM, in a SOP-16. 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	Y0	bidirectional	Y-bank analog switch terminal 0. Bidirectional analog I/O; connected to COMMON Y when A=0, B=0 and INHIBIT=L. Signal range VEE to VDD, typical RON 250 Ω at VDD=10 V.
2	Y2	bidirectional	Y-bank analog switch terminal 2. Bidirectional analog I/O; connected to COMMON Y when A=0, B=1 and INHIBIT=L. Signal range VEE to VDD.
3	COMMON Y	bidirectional	Common (pole) terminal for the Y-bank 4:1 analog switch. Bidirectional; routes to whichever Y0-Y3 the A/B decode selects when INHIBIT=L.
4	Y3	bidirectional	Y-bank analog switch terminal 3. Bidirectional analog I/O; connected to COMMON Y when A=1, B=1 and INHIBIT=L.
5	Y1	bidirectional	Y-bank analog switch terminal 1. Bidirectional analog I/O; connected to COMMON Y when A=1, B=0 and INHIBIT=L.
6	INHIBIT	input	Active-high enable/disable control. When INHIBIT=H all X and Y switches are OFF (both COMMONs isolated). When INHIBIT=L the A/B decode selects one X-Y channel pair. Digital input referenced VSS to VDD (VIH ≥ 7.0 V at VDD=10 V).
7	VEE	power_in	Negative analog supply for the switch path. Sets the lower rail of the analog input/output range; must satisfy VEE ≤ VSS. Typically tied to VSS for single-supply operation or to a negative rail for bipolar analog signals.
8	VSS	power_in	Digital/logic ground (negative supply for the control logic). Reference for VIL/VIH thresholds on A, B and INHIBIT.
9	B	input	Binary channel-select address input, MSB. Together with A selects one of four channels per bank when INHIBIT=L. Digital input referenced VSS to VDD.
10	A	input	Binary channel-select address input, LSB. Together with B selects one of four channels per bank when INHIBIT=L. Digital input referenced VSS to VDD.
11	X3	bidirectional	X-bank analog switch terminal 3. Bidirectional analog I/O; connected to COMMON X when A=1, B=1 and INHIBIT=L.
12	X0	bidirectional	X-bank analog switch terminal 0. Bidirectional analog I/O; connected to COMMON X when A=0, B=0 and INHIBIT=L.
13	COMMON X	bidirectional	Common (pole) terminal for the X-bank 4:1 analog switch. Bidirectional; routes to whichever X0-X3 the A/B decode selects when INHIBIT=L.
14	X1	bidirectional	X-bank analog switch terminal 1. Bidirectional analog I/O; connected to COMMON X when A=1, B=0 and INHIBIT=L.
15	X2	bidirectional	X-bank analog switch terminal 2. Bidirectional analog I/O; connected to COMMON X when A=0, B=1 and INHIBIT=L.
16	VDD	power_in	Positive supply for logic and analog switches. Operating range 3 V to 18 V (absolute max 20 V). Sets the upper rail of the analog signal range and the VIH threshold for the control inputs.

Key specifications

Parameter	Value
Manufacturer	ROHM
Package	SOP-16
Category	Interface
Pins	16

Ordering variants

Same part, different packaging or reel option.

BU4052BCF-E2
BU4052BCFV

CAD (KiCad official)

Symbol: BU4052BCF-E2
Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
3D model: SOP-16 (KiCad packages3D, STEP)

Provenance

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

Datasheet: ROHM datasheet (22 pp, sha256 ed206cb8aca49cd6, 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