company blog about Mingjiada Electronics Supply TI INA819 350µA Low Power Precision Instrumentation Amplifier

Mingjiada Electronics Supply TI INA819 350µA Low Power Precision Instrumentation Amplifier

Mingjiada Electronics supplies the [TI] INA819: a 350µA low-power precision instrumentation amplifier (WSON-8) with ±60V overvoltage protection, empowering industrial and medical signal chains

In applications such as battery-powered devices, analogue inputs for industrial PLCs and portable medical data acquisition, the weak differential signals output by amplifiers are often accompanied by significant common-mode noise and unpredictable transient overvoltages. Texas Instruments (TI)’s INA819 high-precision instrumentation amplifier—with a typical quiescent current of just 350 µA (maximum 385 µA)—integrates ±60 V input overvoltage protection and is housed in a compact WSON-8 (3 mm × 3 mm) package. Mingjiada Electronics stocks the INA819 low-power precision instrumentation amplifier and offers sample procurement or bulk orders for industries such as industrial data acquisition, sensor transmitters and test and measurement.

INA819 Product Overview
The INA819 is a low-power precision instrumentation amplifier from Texas Instruments, with a typical quiescent current of 350 µA. It utilises a super-β input transistor architecture, offering low offset, low noise and excellent temperature drift performance, and allows for a wide gain range of 1 to 10,000 to be configured using a single external resistor; It incorporates built-in ±60 V input overvoltage protection and supports a wide range of single- and dual-supply voltages. The compact WSON-8 (3×3 mm) package features a heat sink pad, making it suitable for high-precision signal acquisition boards with space constraints, and is widely used in applications requiring the amplification of weak differential signals.

INA819 Key Parameters at a Glance
Number of channels: 1-channel differential input instrumentation amplifier
Quiescent current: 0.35 mA (350 µA, typical) / 385 µA (maximum)
Supply voltage range: Single supply 4.5 V–36 V, dual supply ±2.25 V–±18 V
Gain setting: External single resistor RG, G = 1 to 10,000 (G = 1 + 50 kΩ/RG)
Offset voltage: 10 µV (typical) / 35 µV (maximum)
Offset drift: 0.4 µV/°C (maximum); gain drift of 5 ppm/°C at G = 1
Noise density: 8 nV/√Hz @ 1 kHz; noise of 0.19 µVpp from 0.1 to 10 Hz
Bandwidth: 2 MHz (G = 1), 270 kHz (G = 100)
CMRR / PSRR: 110 dB (minimum, G = 10 / G = 1)
Input protection: ±60 V overvoltage protection (independent of supply voltage)
Load stability: Stable when driving a 1 nF capacitive load
Temperature range: –40 °C to +125 °C
Package: WSON-8

Analysis of the Four Key Advantages of the INA819
1. Reliable ±60V overvoltage protection
In industrial environments or medical equipment, accidental contact with high voltages or wiring errors at the input pins can occur. The INA819 incorporates an additional protection circuit, enabling its inputs to withstand overvoltage spikes of up to ±60V (relative to the power supply rail). This feature significantly enhances system robustness and reduces the number of external protection components, such as transient voltage suppressor (TVS) diodes, which is particularly important in high-voltage environments such as circuit breakers and power automation systems.
2. Combining Low Power Consumption with High Accuracy
To meet the stringent power consumption requirements of portable instruments and battery-powered devices, the INA819 has a typical quiescent current of just 350 µA (maximum 385 µA). Despite this ultra-low power consumption, it maintains excellent DC accuracy:
Ultra-low offset voltage: typical 10 µV, maximum only 35 µV
Low temperature drift: gain drift as low as 5 ppm/°C (G=1)
Low input bias current: 150 pA
Low voltage noise density: 8 nV/√Hz
Thanks to super-β input transistor technology, the INA819 delivers extremely low input bias current whilst maintaining exceptionally low voltage and current noise—a critical factor for medical instruments such as electrocardiogram (ECG) amplifiers when capturing faint biological signals.
3. Flexible Gain Settings and Wide Supply Voltage Range
With just a single external resistor, the gain can be set to any value between 1 and 10,000. The device supports a single supply voltage ranging from 4.5 V to 36 V, or a dual supply voltage ranging from ±2.25 V to ±18 V, covering a wide range of requirements from battery-powered handheld devices to industrial PLC analogue input modules.
Gain setting formula: G = 1 + 50 kΩ / R_G
4. Excellent Common-Mode Rejection and Immunity to Interference
The INA819 is optimised to provide a high common-mode rejection ratio (CMRR). When G = 10, the minimum CMRR reaches 110 dB; when G = 1, the CMRR exceeds 90 dB across the entire input common-mode range. Furthermore, the device incorporates built-in EMI filtering and RF suppression capabilities, effectively resisting electromagnetic interference in industrial environments.

Mingjiada Electronics Business Divisions
Supply: Genuine, in-stock INA819 WSON‑8 and other package types, alongside TI instrumentation amplifiers, operational amplifiers, signal conditioning and power management IC (PMIC) series; supporting one-stop BOM fulfilment.
Recycling: Recycling of various electronic components, including idle TI analogue ICs, MCUs, FPGAs, sensors, memory and connectors, from factories and distributors.

For further product information on the INA819 precision instrumentation amplifier or to enquire about sample prices, please visit the Mingjiada Electronics website (https://www.integrated-ic.com/) for more supply details.
Tags: INA819IDRGR, INA819IDRG, INA819IDR, INA819ID, INA819I, INA819.