5 Pin Configuration and Functi…

INA129U

ActiveInstrumentation, OP Amps, Buffer AmpsSOIC

IC INST AMP 1 CIRCUIT 8SOIC

The INA129U is a low-power, precision instrumentation amplifier in an 8-pin SOIC package. It operates with a supply voltage range of ±2.25V to ±18V and allows gain settings from 1 to 10,000 via an external resistor, featuring low offset voltage and high common-mode rejection.Checked against the datasheet

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Technical parameters

Key specs

Supply voltage4.5 ~ 36 V

Gain bandwidth product1.3 MHzTyp · 1.3MHz (G = 1)

Input offset voltage50 µVMax

Quiescent current700 µATyp

Channels1

Datasheet-verified parameters

22 items

Parameter	Value and test conditions	Source
Supply voltage range	Dual-supply: Min ±2.25V, Typ ±15V, Max ±18V; Single-supply: Min 4.5V, Typ 30V, Max 36V
Gain-bandwidth product	1.3MHz (G = 1)
Input offset voltage	Max 50μV
Quiescent current	700μA
Number of channels	1
Package	SOIC (D), 8-Pin
Operating temperature	-40°C to +85°C
Grade	Commercial
Gain	1 to 10,000 V/V
Gain equation	G = 1 + 49.4 kΩ / RG
Common-mode rejection ratio	Min 120dB
Input bias current	Max -5nA (CSO: SHE), Max -0.7nA (CSO: FRE)
Noise	8nV/√Hz, 0.2μVpp
Input overvoltage protection	±40V
Absolute Maximum Ratings - Supply voltage	Dual supply: Max ±18V; Single supply: Max 36V
Absolute Maximum Ratings - Analog input voltage	Max ±40V
Absolute Maximum Ratings - Operating temperature	Min -40°C, Max 125°C
Recommended Operating Conditions - Input common-mode voltage range	Min (V-)+2V, Max (V+)-2V
ESD Ratings - HBM	±2000V
ESD Ratings - CDM	±50V
Load capacitance	1000pF (Stable operation)
Short-circuit current	CSO: SHE: +6/-15mA; CSO: FRE: +18/-18mA (Continuous to VS/2)

All parameters (20)ExpandCollapse

Power
Current - Input Bias	20 nA
Current - Output / Channel	15 mA
Current - Supply	700µA
Voltage - Supply Span (Max)	36 V
Voltage - Supply Span (Min)	4.5 V
AC and DC characteristics
-3db Bandwidth	1.3 MHz
Slew Rate	4V/µs
Voltage - Input Offset	10 µV
Environment and package
Mounting Type	Surface Mount
Operating Temperature	-40°C~85°C
Package	Tube
Package / Case	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package	8-SOIC
Other
Amplifier Type	Instrumentation
Base Product Number	INA129
Mfr	Texas Instruments
Number of Circuits	1
Output Type	-
Product Status	Active
Series	-

Pinout and package

Pin	Name	Function
1	RG	(Gain setting pin)
2	VIN-	(Negative input)
3	VIN+	(Positive input)
4	V-	(Negative supply)
5		Ref (Reference input)
6	VO	(Output)
7	V+	(Positive supply)
8	RG	(Gain setting pin)

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DatasheetDatasheet · 2.7 MB · 2026-10-26

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