Texas Instruments INA114BP

Overview

INA114BP from Texas Instruments is a precision instrumentation amplifier designed for high-accuracy signal conditioning in low-noise, high-common-mode-noise environments. It delivers 50µV max offset voltage, 0.3µV/°C max drift, 115dB min CMRR at G=1000, ±2.25V to ±18V dual-supply operation, and input over-voltage protection up to ±40V - enabling reliable use in surgical equipment and train control systems.

For engineers reviewing the INA114BP datasheet, INA114BP pinout, INA114BP application, or INA114BP equivalent, key selection considerations include its laser-trimmed DC accuracy, single-resistor programmable gain (1–10,000), PDIP-8 package compatibility, and guaranteed −40°C to +85°C operation with internal input protection.

Technical Context

The INA114BP implements a three-op-amp architecture optimized for precision differential measurement, with laser-trimmed internal resistors ensuring stable gain accuracy and low drift. Its input stage features FET-based amplifiers delivering 2nA max input bias current and 100GΩ || 6pF common-mode/differential impedance.

It supports both single-supply (4.5V to 36V) and dual-supply (±2.25V to ±18V) configurations, with output swing limited to (V−)+1.5V to (V+)-1.5V at full temperature range. Input overload tolerance (±40V) is enforced by on-chip protection circuitry that limits input current to ~1.5mA without requiring external components.

Key Specifications

Pinout & Package

INA114BP is supplied in an 8-pin plastic dual in-line package (PDIP-8), measuring 9.81mm × 9.43mm including leads. This through-hole package supports hand-soldering, socket-based prototyping, and long-term reliability in non-automated production.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA114BP, INA128P offers superior DC precision but sacrifices single-supply capability, while AD620ANZ provides lower cost and smaller size at the expense of guaranteed low-drift performance and through-hole packaging - making INA114BP uniquely balanced for rugged, field-deployable instrumentation.

Availability

INA114BP is available at Aetrix Electronics and suitable for surgical equipment, actuator control, multifunction relay, and train control and management systems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for INA114BP 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 leader specializing in analog, embedded processing, and digital signal technologies with over 90 years of innovation in precision analog ICs.

The INA114 product line targets cost-sensitive, high-reliability instrumentation applications - delivering laser-trimmed accuracy, robust input protection, and flexible supply operation for medical, industrial, and transportation systems.

FAQ

What is the maximum gain achievable with INA114BP and how is it set?

The INA114BP supports a gain range of 1 to 10,000, set by a single external resistor RG using the equation G = 1 + 50 kΩ / RG. For G = 10,000, RG = 5Ω - requiring careful PCB layout to minimize parasitic resistance. The INA114BP's internal laser-trimmed 50kΩ resistor network ensures stable gain accuracy across temperature and supply variations.

Does INA114BP support single-supply operation and what is the minimum supply voltage?

Yes, INA114BP supports true single-supply operation from 4.5V to 36V. At 5V supply, it maintains full functionality with output swing from ~1.5V to ~3.5V (V− + 1.5V to V+ − 1.5V). This enables direct integration into battery-powered portable diagnostics and 5V microcontroller-based systems without level-shifting circuitry.

What is the purpose of the NC pin (Pin 8) on INA114BP and can it be tied to ground?

Pin 8 on INA114BP is designated NC (No Connect) and must remain unconnected - it is internally unused and not bonded. Connecting it to ground, V+, V−, or any other node may compromise device reliability or violate TI's qualification conditions. The INA114BP datasheet explicitly prohibits any connection to Pin 8 to ensure guaranteed performance and lifetime compliance.

How does INA114BP handle input overvoltage conditions beyond the supply rails?

INA114BP incorporates internal input protection circuitry that safely withstands continuous ±40V on either input relative to ground - even with no power applied. During overvoltage, internal clamps limit input current to ~1.5mA, preventing damage without requiring external diodes or resistors. This behavior is fully characterized and guaranteed across the −40°C to +85°C operating range for the INA114BP variant.

Is there a difference in performance between INA114BP and INA114AP, and which should I choose?

Yes: INA114BP specifies tighter DC performance - 50µV max offset voltage and 0.3µV/°C max drift - versus INA114AP's 125µV and 1µV/°C. Both share identical pinout, package, and AC specs. Choose INA114BP for applications demanding highest DC accuracy (e.g., surgical sensors, precision RTD measurement), and INA114AP where cost sensitivity outweighs drift-critical requirements.