Overview
The INA333-Q1 is a low-power, precision instrumentation amplifier designed and manufactured by Texas Instruments. This device is particularly suited for automotive applications due to its AEC-Q100 qualification and functional safety capabilities. It features a three-op-amp design, which ensures excellent accuracy and precision, making it ideal for applications such as current leakage detection and those using resistive bridge sensors. The INA333-Q1 operates over a wide temperature range of –40°C to +125°C and is available in an 8-pin VSSOP package.
Key Specifications
| Specification | Value |
|---|---|
| Package | 8-pin VSSOP (DGK) |
| Operating Temperature Range (°C) | –40 to +125 |
| Supply Range (V) | 1.8 to 5.5 |
| Input Voltage Range | (V–) + 0.1 V to (V+) – 0.1 V |
| Output Range | (V–) + 0.05 V to (V+) – 0.05 V |
| Offset Voltage (µV, G ≥ 100) | 25 (maximum) |
| Offset Voltage Drift (µV/°C, G ≥ 100) | 0.1 |
| Noise Density (nV/√Hz, G ≥ 100) | 50 |
| Common-Mode Rejection Ratio (dB, G ≥ 10) | 96 (minimum) |
| Input Bias Current (pA) | 280 (maximum) |
| Quiescent Current (µA) | 50 |
Key Features
- AEC-Q100 qualified for automotive applications with a temperature grade 1: –40°C ≤ T_A ≤ +125°C.
- Functional Safety-Capable.
- 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).
- RFI filtered inputs.
- Single external resistor sets any gain from 1 to 1000 using the industry-standard gain equation: G = 1 + (100 kΩ / R_G).
Applications
The INA333-Q1 is highly suitable for various automotive applications that require precise measurements, such as current leakage detection and those using resistive bridge sensors. Its low power consumption and high precision make it ideal for battery-operated systems and other portable applications.
Q & A
- What is the operating temperature range of the INA333-Q1? The INA333-Q1 operates over a temperature range of –40°C to +125°C.
- What is the supply voltage range for the INA333-Q1? The supply voltage range is from 1.8 V to 5.5 V.
- What is the maximum offset voltage of the INA333-Q1? The maximum offset voltage is 25 µV for gains greater than or equal to 100.
- How is the gain of the INA333-Q1 set? The gain is set using a single external resistor with the industry-standard gain equation: G = 1 + (100 kΩ / R_G).
- What is the common-mode rejection ratio (CMRR) of the INA333-Q1? The CMRR is 96 dB (minimum) for gains greater than or equal to 10.
- Is the INA333-Q1 suitable for automotive applications? Yes, it is AEC-Q100 qualified and functional safety-capable, making it suitable for automotive applications.
- What is the quiescent current of the INA333-Q1? The quiescent current is 50 µA.
- What package types are available for the INA333-Q1? The INA333-Q1 is available in an 8-pin VSSOP package.
- Does the INA333-Q1 have RFI filtered inputs? Yes, it has RFI filtered inputs.
- What is the input bias current of the INA333-Q1? The input bias current is 280 pA (maximum).
