Texas Instruments INA828ID

Overview

INA828ID from Texas Instruments is a precision instrumentation amplifier optimized for high-accuracy signal conditioning in low-power, wide-supply industrial and medical systems. It delivers 50 µV max input offset voltage, 7 nV/√Hz input voltage noise, 2 MHz bandwidth at G = 1, ±40 V input overvoltage protection, and operates from ±2.25 V to ±18 V dual supply (or 4.5 V to 36 V single supply) across –40°C to +125°C.

For engineers reviewing the INA828ID datasheet, INA828ID pinout, INA828ID application, or INA828ID equivalent, this page provides verified technical context on gain-setting architecture, CMRR vs frequency behavior, RTI noise performance, thermal stability of offset drift, and SOIC-8 layout considerations for precision PCB design.

Technical Context

The INA828ID uses a current-feedback input stage with super-beta NPN transistors and a laser-trimmed 4-resistor difference amplifier output stage. Its gain is set by a single external resistor (RG) between pins 1 and 8, enabling programmable gain from 1 to 1000 via Equation G = 1 + (50 kΩ / RG).

Input overvoltage protection employs dual FETs per input, limiting fault current to ~8 mA while maintaining 100 GΩ || 10 pF common-mode impedance and preserving low-noise operation. CMRR exceeds 110 dB (min) at G = 10 and improves to 145 dB (typ) at G = 1000 up to 60 Hz, with stable rejection maintained to 100 kHz.

Key Specifications

Pinout & Package

INA828ID is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size), optimized for thermal performance (RθJA = 119.6 °C/W) and PCB assembly compatibility in space-constrained industrial modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar instrumentation amplifier applications.

Compared with INA128P and AD8421ARZ, the INA828ID uniquely balances low offset (50 µV), low noise (7 nV/√Hz), low power (650 µA), and robust ±40 V input protection in a single SOIC-8 package-making it optimal for cost-sensitive, space-constrained, and safety-critical industrial and medical signal chains.

Availability

INA828ID is available at Aetrix Electronics and suitable for industrial process controls, circuit breaker monitoring, ECG amplifiers, and battery testers requiring stable component supply, extended temperature operation (–40°C to +125°C), and long-term production continuity.

Supply support for INA828ID includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision amplifiers, data converters, and power management ICs.

The INA828ID belongs to TI's second-generation precision instrumentation amplifier product line, designed specifically for high-accuracy, low-power, and robust industrial and medical sensor signal conditioning where offset, noise, drift, and reliability are critical.

FAQ

What is the maximum gain achievable with the INA828ID, and how is it set?

The INA828ID supports gains from 1 to 1000, set by a single external resistor (RG) connected between pins 1 and 8. The gain equation is G = 1 + (50 kΩ / RG). For G = 1000, RG = 50.05 Ω (nearest 1% value: 49.9 Ω). The internal 25-kΩ feedback resistors are laser-trimmed, ensuring accurate gain without external trimming. The INA828ID datasheet specifies gain error up to ±0.05% at G = 1000.

Does the INA828ID require external components for basic operation?

Yes - the INA828ID requires an external gain-setting resistor (RG) for any gain >1. For G = 1, RG is left unconnected (open). A low-impedance source must drive the REF pin, and local 0.1-µF ceramic decoupling capacitors are mandatory on both +VS and –VS pins. No external compensation or clamping is needed due to integrated ±40 V input protection and 1-nF capacitive-load stability.

How does the INA828ID handle input overvoltage conditions?

The INA828ID incorporates dual FET-based overvoltage protection on both inputs, allowing safe operation with input voltages up to ±40 V beyond the supply rails. Under overvoltage, the FETs limit input current to approximately 8 mA, preventing damage without degrading normal-operation parameters like CMRR or noise. This eliminates the need for external TVS diodes or series resistors in most industrial sensor interfaces.

What is the typical common-mode rejection ratio (CMRR) of the INA828ID at G = 100?

At G = 100, the INA828ID delivers a minimum CMRR of 130 dB (dc to 60 Hz), with typical performance reaching 140 dB. This high rejection is maintained up to 100 kHz (see Figure 17 in the INA828ID datasheet), making it effective against high-frequency EMI and switching noise in motor drives or SMPS environments. CMRR remains stable across temperature and common-mode voltage range.

Can the INA828ID operate from a single 5-V supply, and what is its output swing?

Yes - the INA828ID operates from a single 4.5-V to 36-V supply. With VS = 5 V, the output swings from (V–) + 0.15 V to (V+) – 0.15 V, delivering >4.7 V of linear range into 10 kΩ. Output swing is rail-to-rail limited only by 150 mV headroom, supporting full utilization of 12- or 16-bit ADCs. Performance specifications including offset, noise, and CMRR are guaranteed across the full supply and temperature range.