SN75176BDR from UMW, 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	R	output	Logic data output from the RS-485 receiver. CMOS-compatible output driven from the differential comparator on A/B; high when V_ID = V_A - V_B > +200mV, low when < -200mV. High-impedance when /RE is deasserted (high).
2	/RE	input	Receiver enable, active low. Drive low to enable the receiver output R; drive high to place R in high-impedance. Can be tied with DE to form a direction-control signal.
3	DE	input	Driver enable, active high. Drive high to enable the differential driver onto bus pins A/B; drive low to place the driver in high-impedance so the bus can be used by other transceivers.
4	D	input	Logic data input to the RS-485 driver. When DE is high, a logic-high on D drives A high and B low; a logic-low drives A low and B high. V_IH = 2V min, V_IL = 0.8V max.
5	GND	power_in	Device ground pin (0V reference).
6	A	bidirectional	Non-inverting RS-422/RS-485 differential bus line. Serves as driver output when DE is high and as receiver input when /RE is low. Withstands -7V to +12V common-mode; receiver input impedance ≥12kΩ.
7	B	bidirectional	Inverting RS-422/RS-485 differential bus line. Serves as driver output when DE is high and as receiver input when /RE is low. Withstands -7V to +12V common-mode; receiver input impedance ≥12kΩ.
8	VCC	power_in	Positive supply input. Connect to a single 5V supply (4.75V to 5.25V recommended; 7V absolute max). Typical I_CC 42mA with outputs enabled.

Key specifications

Parameter	Value
Manufacturer	UMW
Package	SOP-8
Category	Interface
Pins	8

Ordering variants

Same part, different packaging or reel option.

SN75176BDRD
SN75176BDR
SN75176BDRP
SN75176BDRPS

CAD (KiCad official)

Symbol: SN75176BDR
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
`sn75176bdr.step`	122 KB	You want the bare part, or you mark your own boards.
`sn75176bdr-etched.step`	2.0 MB	You want the part with `SN75176BDR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 510 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: UMW datasheet (30 pp, sha256 6967824b2ea2d976, 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).

Datasheet PDF