ADM1491EBRMZ from Analog Devices, in a MSOP-10. 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	RO	output	Receiver output; high impedance when RE is high.
2	RE	input	Receiver output enable; a low level enables the receiver output, a high level places it in high impedance.
3	DE	input	Driver output enable; a logic high enables the differential driver outputs, a logic low places them in high impedance.
4	DI	input	Driver input; with driver enabled, a logic low forces Y low and Z high while a logic high forces Y high and Z low.
5	GND	power_in	Ground.
6	Y	output	Noninverting driver output Y, ESD protected to ±8 kV HBM.
7	Z	output	Inverting driver output Z, ESD protected to ±8 kV HBM.
8	B	input	Inverting receiver input B, ESD protected to ±8 kV HBM with 12 kΩ minimum input resistance.
9	A	input	Noninverting receiver input A, ESD protected to ±8 kV HBM with 12 kΩ minimum input resistance.
10	VCC	power_in	Power supply, 5 V ± 5% (4.75 V to 5.25 V).

Key specifications

Parameter	Value
Manufacturer	Analog Devices
Package	MSOP-10
Category	Communication Interface Chip/UART/485/232
Pins	10

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 Voltage	VCC	4.75		5.25	V	4.75 V ≤ VCC ≤ 5.25 V	3
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
Delta 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
Delta 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
Logic Input Current	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
Input Current (A, B)	II			1	mA	VCM = 12 V	3
Input Current (A, B)	II	-0.8			mA	VCM = −7 V	3
Line Input Resistance	RIN	12		30	kΩ	−7 V ≤ VCM ≤ +12 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
Receiver Short-Circuit Current				85	mA		3
Three-State Output Leakage Current	IOZR	-1		1	µA	VCC = 5.25 V, 0.4 V < VOUT < 2.4 V	3
Driver Maximum Data Rate		16			Mbps	TA = −40°C to +85°C	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, 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	tSKEW		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
VCC to GND	VCC	-0.3		7	V	TA = 25°C	5
Digital I/O Voltage (DE, RE)		-0.3			V	Max is VCC + 0.3 V	5
Driver Input Voltage (DI)		-0.3			V	Max is VCC + 0.3 V	5
Receiver Output Voltage (RO)		-0.3			V	Max is VCC + 0.3 V	5
Driver Output/Receiver Input Voltage (A, B, Y, Z)		-9		14	V	TA = 25°C	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	Human body model	5
Thermal Resistance, 10-Lead MSOP	θJA		133		°C/W	Worst-case, device soldered in circuit board	5

CAD (KiCad official)

Symbol: ADM1491EBRMZ
Footprint: Package_SO:MSOP-10_3x3mm_P0.5mm
3D model: MSOP-10 (KiCad packages3D, STEP)
3D model files: adm1491ebrmz-etched.step / adm1491ebrmz-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); adm1491ebrmz.step / adm1491ebrmz.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-sonnet-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).

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ADM1491EBRMZ

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