ADM1491EBRZ from Analog Devices, in a SOIC-14. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	NC	unconnected	No connect; do not connect to this pin (available on the 14-lead SOIC only).
2	RO	output	Receiver output; RO goes high when A − B ≥ +0.2 V and low when A − B ≤ −0.2 V, and is high impedance when RE is high.
3	RE	input	Receiver output enable; a low level enables the receiver output, whereas a high level places the receiver output in a high impedance state.
4	DE	input	Driver output enable; a logic high enables the differential driver outputs, whereas a logic low places the driver outputs in a high impedance state.
5	DI	input	Driver input; when the driver is enabled, a logic low on DI forces Pin A low and Pin B high, whereas a logic high on DI forces Pin A high and Pin B low.
6	GND	power_in	Ground.
7	GND	power_in	Ground; this pin is not connected internally and is shown as GND to comply with the industry-standard pinout.
8	NC	unconnected	No connect; do not connect to this pin (available on the 14-lead SOIC only).
9	Y	output	Noninverting driver output Y; the driver output/receiver input voltage rating for A, B, Y and Z is −9 V to +14 V.
10	Z	output	Inverting driver output Z; the driver output/receiver input voltage rating for A, B, Y and Z is −9 V to +14 V.
11	B	input	Inverting receiver input B; the driver output/receiver input voltage rating for A, B, Y and Z is −9 V to +14 V.
12	A	input	Noninverting receiver input A; the driver output/receiver input voltage rating for A, B, Y and Z is −9 V to +14 V.
13	VCC	power_in	Power supply, 5 V ± 5%.
14	VCC	power_in	Power supply, 5 V ± 5% (available on the 14-lead SOIC only); this pin is not connected internally and is shown as VCC to comply with the industry-standard pinout.

Key specifications

Parameter	Value
Manufacturer	Analog Devices
Package	SOIC-14
Category	Communication Interface Chip/UART/485/232
Pins	14

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Supply Current, Outputs Enabled	ICC1		1.2	2	mA	Outputs unloaded, digital inputs = VCC or GND	3
Supply Current, Outputs Disabled	ICC2		0.8	1.5	mA	Outputs unloaded, digital inputs = VCC or GND	3
Differential Output Voltage, Loaded	/VOD2/	2		5	V	RL = 100 Ω (RS-422), see Figure 21	3
Differential Output Voltage, Loaded	/VOD2/	1.5		5	V	RL = 54 Ω (RS-485), see Figure 21	3
Differential Output Voltage	/VOD3/	1.5		5	V	−7 V ≤ VTEST ≤ +12 V, see Figure 22	3
∆/VOD/ for Complementary Output States	∆/VOD2/			0.2	V	RL = 54 Ω or 100 Ω, see Figure 21	3
Common-Mode Output Voltage	VOC			3	V	RL = 54 Ω or 100 Ω, see Figure 21	3
∆/VOC/ for Complementary Output States	∆/VOC/			0.2	V	RL = 54 Ω or 100 Ω, see Figure 21	3
Output Leakage Current (Y, Z)	IO			100	µA	DE = 0 V, VDD = 0 V or 5 V, VIN = 12 V	3
Output Leakage Current (Y, Z)	IO	-100			µA	DE = 0 V, VDD = 0 V or 5 V, VIN = −7 V	3
Output Short-Circuit Current	IOS			250	mA	−7 V < VOUT < +12 V	3
Input Low Voltage	VIL			0.8	V	DE, RE, DI	3
Input High Voltage	VIH	2			V	DE, RE, DI	3
Input Current (logic inputs)	II	-1		1	µA	DE, RE, DI	3
Differential Input Threshold Voltage	VTH	-0.2		0.2	V	−7 V < VCM < +12 V	3
Input Voltage Hysteresis	VHYS		30		mV	VCM = 0 V	3
Line Input Resistance	RIN	12		30	kΩ	−7 V ≤ VCM ≤ +12 V	3
Input Current (A, B)	II			1	mA	VCM = 12 V	3
Input Current (A, B)	II	-0.8			mA	VCM = −7 V	3
Output Voltage Low	VOL			0.4	V	IOUT = +4.0 mA, VA − VB = −0.2 V	3
Output Voltage High	VOH	4			V	IOUT = −4.0 mA, VA − VB = +0.2 V	3
Short-Circuit Current (receiver output)				85	mA		3
Three-State Output Leakage Current	IOZR	-1		1	µA	VCC = 5.25 V, 0.4 V < VOUT < 2.4 V	3
Maximum Data Rate				16	Mbps		4
Driver Propagation Delay	tDPLH, tDPHL		11	17	ns	RL = 54 Ω, CL = 100 pF, see Figure 23 and Figure 3	4
Driver Output Skew	tSKEW		0.5	2	ns	RL = 54 Ω, CL = 100 pF, see Figure 23 and Figure 3, tSKEW = /tDPLH − tDPHL/	4
Driver Rise Time/Fall Time	tDR, tDF		8	15	ns	RL = 54 Ω, CL = 100 pF, see Figure 23 and Figure 3	4
Driver Enable Time	tZH, tZL			20	ns	RL = 110 Ω, CL = 50 pF, see Figure 24 and Figure 5	4
Driver Disable Time	tHZ, tLZ			20	ns	RL = 110 Ω, CL = 50 pF, see Figure 24 and Figure 5	4
Receiver Propagation Delay	tPLH, tPHL		12	20	ns	CL = 15 pF, see Figure 25 and Figure 4	4
Receiver Skew	/tPLH − tPHL/		0.4	2	ns	CL = 15 pF, see Figure 25 and Figure 4	4
Receiver Enable Time	tZH, tZL			13	ns	RL = 1 kΩ, CL = 15 pF, see Figure 26 and Figure 6	4
Receiver Disable Time	tHZ, tLZ			13	ns	RL = 1 kΩ, CL = 15 pF, see Figure 26 and Figure 6	4
Supply Voltage VCC (recommended operation range)	VCC	4.75		5.25	V	All min/max specifications apply over the entire recommended operation range	3
VCC to GND		-0.3		7	V		5
Digital I/O Voltage (DE, RE)		-0.3			V		5
Driver Input Voltage (DI)		-0.3			V		5
Receiver Output Voltage (RO)		-0.3			V		5
Driver Output/Receiver Input Voltage (A, B, Y, Z)		-9		14	V		5
Operating Temperature Range		-40		85	°C		5
Storage Temperature Range		-55		150	°C		5
ESD (HBM) on A, B, Y, and Z		-8		8	kV		5
Thermal Resistance, 14-Lead SOIC (junction-to-ambient)	θJA		86		°C/W	Worst-case; device soldered in a circuit board for surface-mount packages	5

CAD (KiCad official)

Symbol: ADM1491EBRZ
Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
3D model: SOIC-14 (KiCad packages3D, STEP)
3D model files: adm1491ebrz-etched.step / adm1491ebrz-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); adm1491ebrz.step / adm1491ebrz.glb are the bare package body.

Provenance

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

Datasheet: Analog Devices datasheet (16 pp, sha256 74a5d8439f987121, retrieved 2026-10-30, tier: manufacturer)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF

ADM1491EBRZ

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3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

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