Texas Instruments INA114APG4

Overview

INA114APG4 from Texas Instruments is a precision instrumentation amplifier designed for high-accuracy signal conditioning in low-noise, high-common-mode-rejection applications. It delivers 50µV max offset voltage, 0.3µV/°C max drift, and 115dB min CMRR at G=1000, operating from ±2.25V to ±18V supplies. It is used in surgical equipment, train control systems, and bridge transducer interfaces where input over-voltage protection (±40V) and stable gain (1–10,000 via single RG resistor) are critical.

For engineers reviewing the INA114APG4 datasheet, INA114APG4 pinout, INA114APG4 application, or INA114APG4 equivalent, key selection factors include its PDIP-8 package, laser-trimmed DC accuracy, three-op-amp architecture, input bias current ≤2nA, and guaranteed −40°C to +85°C operation - all confirmed for this specific variant.

Technical Context

The INA114APG4 implements a classic three-op-amp instrumentation topology with internal laser-trimmed thin-film resistors defining gain-setting accuracy and drift. Its input stage uses bipolar junction transistors to achieve low input bias current (≤2nA) while maintaining robust ±40V input over-voltage protection independent of supply presence.

Gain is set externally via a single resistor (RG) using G = 1 + 50kΩ/RG, with the 50kΩ term derived from matched on-chip metal film resistors. The device supports both dual-supply (±2.25V to ±18V) and single-supply (4.5V to 36V) operation, with output swing limited to (V−)+1.5V to (V+)-1.5V at full temperature range.

Key Specifications

Pinout & Package

The INA114APG4 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 manual prototyping and legacy PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA114APG4, INA128P offers superior bias-current-limited accuracy but sacrifices low-voltage operability, while AD620ANZ trades ruggedness for speed - making INA114APG4 optimal for cost-sensitive, transient-prone industrial signal chains requiring guaranteed ±40V tolerance and ±2.25V start-up.

Availability

INA114APG4 is available at Aetrix Electronics and suitable for surgical equipment, train control systems, and bridge transducer interfaces requiring stable component supply across extended product lifecycles.

Supply support for INA114APG4 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 and embedded processing technologies, with decades of heritage in precision amplifiers and industrial-grade ICs.

The INA114 belongs to TI's general-purpose instrumentation amplifier product line, engineered for cost-effective, high-accuracy signal conditioning in medical, transportation, and industrial measurement systems where reliability and DC precision are paramount.

FAQ

What is the maximum gain achievable with INA114APG4?

The INA114APG4 supports gains from 1 to 10,000, set by a single external resistor using G = 1 + 50kΩ/RG. At G = 10,000, RG = 5Ω - requiring careful layout to minimize parasitic resistance. The device maintains specified accuracy (e.g., ±2% gain error at G = 1000) across its full gain range, and the INA114APG4 datasheet confirms performance down to G = 1 and up to G = 10,000 under recommended operating conditions.

Does INA114APG4 require external components for basic operation?

Yes - the INA114APG4 requires only one external resistor (RG) to set gain and a low-impedance connection on the Ref pin (Pin 1) for proper common-mode rejection. Decoupling capacitors (e.g., 0.1µF ceramic near V+ and V−) are recommended for noisy supplies. No external trimming or compensation is needed, as the INA114APG4 is laser-trimmed for offset, drift, and CMRR, and its internal protection eliminates mandatory external diodes.

Can INA114APG4 operate from a single 5V supply?

Yes - the INA114APG4 supports single-supply operation from 4.5V to 36V. When powered from +5V and ground, V− = 0V and V+ = 5V, and the output swings from ~1V to ~4V (depending on load and gain). The Ref pin must be biased to mid-supply (e.g., 2.5V) for optimal common-mode range. This capability is explicitly validated in the INA114APG4 recommended operating conditions table and enables use in portable and low-power systems.

What is the purpose of the two RG pins (Pins 5 and 6) on INA114APG4?

Pins 5 and 6 of the INA114APG4 form the two terminals of the internal 50kΩ gain-setting resistor network. Connecting an external resistor (RG) between them configures the amplifier's gain per G = 1 + 50kΩ/RG. This dual-pin arrangement isolates the gain-setting function from signal paths and ensures predictable, stable feedback. The INA114APG4 datasheet confirms this configuration is mandatory - omitting RG or shorting Pins 5–6 forces unity gain and invalidates all high-gain specifications.

Is INA114APG4 RoHS compliant and lead-free?

Yes - the INA114APG4 is RoHS compliant and lead-free, as confirmed by Texas Instruments' official packaging and environmental documentation. The "G4" suffix denotes green (lead-free) packaging per TI's nomenclature, and the device meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1 requirements. Full compliance data, including substance declarations and test reports, is accessible via TI's Quality & Environmental Information portal for the INA114APG4 part number.