INA333-Q1 Automotive, Zerø-Drift, micro-Power Instrumentation Amplifier

1 Features

• AEC-Q100 qualified for automotive applications:

– Temperature grade 1: –40°C ≤ TA ≤ +125°C

• Functional Safety-Capable

– Documentation available to aid functional safety

system design

• Low offset voltage: 25 μV (maximum), G ≥ 100

• Low drift: 0.1 μV/°C, G ≥ 100

• Low noise: 50 nV/√Hz, G ≥ 100

• High CMRR: 96 dB (minimum), G ≥ 10

• Low input bias current: 280 pA (maximum)

• Supply range: 1.8 V to 5.5 V

• Input voltage: (V–) + 0.1 V to (V+) – 0.1 V

• Output range: (V–) + 0.05 V to (V+) – 0.05 V

• Low quiescent current: 50 μA

• Operating temperature: –40°C to +125°C

• RFI filtered inputs

• Package: 8-pin VSSOP

2 Applications

• Powertrain torque sensor

• Powertrain pressure sensor

• Powertrain temperature sensor

• Powertrain knock sensor

• Vehicle occupant detection sensor

• Driver vital sign monitoring

• Control-panel, force-sensor-based switches

3 Description

The

INA333-Q1

is

a

low-power,

precision

instrumentation amplifier offering excellent accuracy.

The three-op-amp design, small size, and low power

make this device an excellent choice for automotive

applications that require precise measurements, such

as current leakage detection. This INA333-Q1 is also

a great choice for applications that use resistive

bridge sensors.

A single external resistor sets any gain from 1 to

1000. The INA333-Q1 is designed to use an industry-

standard gain equation: G = 1 + (100 kΩ / RG).

The INA333-Q1 provides very low offset voltage

(25 μV, G ≥ 100), excellent offset voltage drift

(0.1 μV/°C, G ≥ 100), and high common-mode

rejection (96 dB at G ≥ 10). The device operates

with power supplies as low as 1.8 V (±0.9 V), and

quiescent current is only 50 μA. Auto-calibration

techniques maintain excellent precision over the

automotive temperature range. The INA333-Q1

provides a very low peak-to-peak noise of 1 µV.

The INA333-Q1 device is available in an 8-pin

VSSOP package and is specified over the TA = –40°C

to +125°C temperature range.

Package Information

PART NUMBER

PACKAGE(1)

PACKAGE SIZE(2)

INA333-Q1

VSSOP (8)

3 mm × 4.9 mm

(1)

For all available packages, see the package option

addendum at the end of the data sheet.

(2)

The package size (length × width) is a nominal value and

includes pins, where applicable.

RFI Filtered Inputs

RFI Filtered Inputs

50 k

RFI Filtered Inputs

RFI Filtered Inputs

50 k

150 k

150 k

150 k

150 k

INA333-Q1

1

8

6

5

2

3

VOUT

REF

VIN-

VIN+

RG

A1

A2

–

–

+

+

7

V+

4

V

A3

–

+

G = 1 +

100 k

RG

Simplified Schematic

INA333-Q1

SBOS464B – SEPTEMBER 2019 – REVISED JUNE 2023

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.