ISL3172EIBZ-T from RENESAS, in a SOIC-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	RO	output	Receiver output. RO is high when A-B ≥ -50mV and low when A-B ≤ -200mV. RO is high (full fail-safe) when the A and B inputs are open, shorted, or terminated and undriven. High-Z when /RE is high.
2	/RE	input	Active-low receiver output enable. RO is enabled when /RE is low; RO is high-impedance when /RE is high. If not required, tie to GND directly or through a 1kΩ to 3kΩ resistor. VIH ≥ 2V, VIL ≤ 0.8V.
3	DE	input	Driver output enable. Driver outputs Y and Z are enabled when DE is high and are high-impedance when DE is low. If not required, tie to VCC through a 1kΩ to 3kΩ resistor. Driving both DE=0 and /RE=1 puts the part into shutdown mode.
4	DI	input	Driver input. A low on DI forces Y low and Z high; a high on DI forces Y high and Z low. Logic input thresholds VIH ≥ 2V, VIL ≤ 0.8V.
5	GND	power_in	Ground reference for the transceiver.
6	A/Y	bidirectional	±15kV IEC61000 ESD protected RS-485/RS-422 non-inverting bus pin. Acts as the receiver non-inverting input when DE = 0; acts as the driver non-inverting output (Y) when DE = 1. Common-mode range -7V to +12V.
7	B/Z	bidirectional	±15kV IEC61000 ESD protected RS-485/RS-422 inverting bus pin. Acts as the receiver inverting input when DE = 0; acts as the driver inverting output (Z) when DE = 1. Common-mode range -7V to +12V.
8	VCC	power_in	System power supply input, 3.0V to 3.6V. Bypass with a 0.1µF ceramic capacitor to GND close to the pin. Quiescent supply current 510µA typical (800µA max); shutdown current 10nA typical.

Key specifications

Parameter	Value
Manufacturer	RENESAS
Package	SOIC-8
Category	Interface
Pins	8

Ordering variants

Same part, different packaging or reel option.

ISL3172EIBZ-T
ISL3172EIUZ

CAD (KiCad official)

Symbol: ISL3172EIBZ-T
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`isl3172eibz-t.step`	122 KB	You want the bare part, or you mark your own boards.
`isl3172eibz-t-etched.step`	2.1 MB	You want the part with `ISL3172EIBZ-T` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 542 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: RENESAS datasheet (19 pp, sha256 46582fa2933098c4, 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