1 Features
1• Low Offset Voltage: 25 uV Typical
• Low Input Bias Current: 50 nA Typical (1)
• High CMR: 95 dB Typical(1)
• Inputs Protected to ±40 V
• Wide Supply Range: ±2.25 V to ±18 V
• Low Quiescent Current: 2 mA Typical(1)

2 Applications
• Bridge Amplifiers
• Thermocouple Amplifiers
• RTD Sensor Amplifiers
• Medical Instrumentation
• Data Acquisition
• Supports Extreme Temperature Applications:
– Controlled Baseline
– One Assembly/Test Site
– One Fabrication Site
– Available in Extreme Temperature Ranges
(–55°C to 210°C) (2)
– Extended Product Life Cycle
– Extended Product-Change Notification
– Product Traceability

3 Description
The INA128-HT and INA129-HT are low-power,
general-purpose instrumentation amplifiers offering excellent accuracy. The versatile three-operational-
amplifier design and small size make them ideal for a
wide range of applications. Current-feedback input
circuitry provides wide bandwidth even at high gain. A single external resistor sets any gain from 1 to 10000.
The INA128-HT provides an industry-standard gain
equation; the INA129-HT gain equation is compatible
with the AD620.
The INA128-HT and INA129-HT are laser trimmed for
very low offset voltage (25 μV Typ) and high
common-mode rejection (93 dB at G ≥ 100). These devices operate with power supplies as low as ±2.25
V, and quiescent current of 2 mA, typically. Internal
input protection can withstand up to ±40 V without
damage.
Texas Instruments' high-temperature products use
highly optimized silicon (die) solutions with design
and process enhancements to maximize performance
over extended temperatures.
The INA129-HT is available in 8-pin ceramic DIP and
8-pin ceramic surface-mount packages, specified for
the –55°C to 210°C temperature range. The INA128-
HT is available in an 8-pin SOIC-8 surface-mount
package, specified for the –55°C to 175°C temperature range.