OP281 Ultralow Power, Rail-to-Rail Output Operational Amplifier (Dual)

The OP281 and OP481 are dual and quad ultralow power single-supply amplifiers featuring rail-to-rail outputs. Each operates from supplies as low as 2.0 V and is specified at +3 V and +5 V single supplies as well as ±5 V dual supplies.

Fabricated on Analog Devices’ CBCMOS process, the OP281/OP481 feature a precision bipolar input and an output that swings to within millivolts of the supplies, continuing to sink or source current up to a voltage equal to the supply voltage.

Applications for these amplifiers include safety monitoring, portable equipment, battery and power supply control, and signal conditioning and interfacing for transducers in very low power systems.

The output’s ability to swing rail-to-rail and not increase supply current when the output is driven to a supply voltage enables the OP281/OP481 to be used as comparators in very low power systems. This is enhanced by their fast saturation recovery time. Propagation delays are 250 μs.

The OP281/OP481 are specified over the extended industrial temperature range (−40°C to +85°C). The OP281 dual amplifier is available in 8-lead SOIC surface-mount and TSSOP packages. The OP481 quad amplifier is available in narrow 14-lead SOIC and TSSOP packages.

Applications

Comparator
Battery-powered instrumentation
Safety monitoring
Remote sensors
Low voltage strain gage amplifiers

Features and Benefits

Low supply current: 4 μA/amplifier maximum

Single-supply operation: 2.7 V to 12 V

Wide input voltage range

Rail-to-rail output swing

Low offset voltage: 1.5 mV

No phase reversal

Amplifiers

SPICE Models

OP281 SPICE Macro-Model .CIR

Data Sheets

Document	note
OP281/OP481: Ultralow Power, Rail-to-Rail Output Operational Amplifiers Data Sheet (Rev. D)	PDF 390 kB

Application Notes

Document	note
AN-649: Using the Analog Devices Active Filter Design Tool (Rev. 0)	PDF 5.3 M

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
OP281GRUZ-REEL Production	8 ld TSSOP	REEL 2500	-40 to 85C	0	2.79	Y
OP281GSZ Production	8 ld SOIC	OTH 98	-40 to 85C	2.94	2.79	Y
OP281GSZ-REEL7 Production	8 ld SOIC	REEL 1000	-40 to 85C	0	2.79	Y

Evaluation Boards

Part Number	Description	Price	RoHS
EVAL-PRAOPAMP-2CPZ	Dual CP-8 lead LFCSP Evaluation Board	20.19	Y
EVAL-PRAOPAMP-2RMZ	Dual RM-8 lead MSOP Evaluation Board	20.19	Y
EVAL-PRAOPAMP-2RZ	Dual R-8 lead SOIC Evaluation Board	20.19	Y