Texas Instruments INA103KPG4

Overview

INA103KPG4 from Texas Instruments (formerly Burr-Brown) is a low-noise, low-distortion current-feedback instrumentation amplifier optimized for high-fidelity audio and precision sensor signal conditioning. It delivers 1 nV/√Hz input voltage noise at 1 kHz, 0.0009% THD+N at G = 100, 100 MHz gain-bandwidth at G = 1000, ±9 V to ±25 V dual supply operation, and >100 dB CMRR - enabling its use in professional microphone preamplifiers, strain gage interfaces, and thermocouple amplification.

For engineers reviewing the INA103KPG4 datasheet, INA103KPG4 pinout, INA103KPG4 application, or INA103KPG4 equivalent, this page provides verified circuit role, validated pin functions, confirmed thermal and dynamic performance specs, and two rigorously cross-checked alternative parts for audio-grade instrumentation amplifier selection.

Technical Context

The INA103KPG4 employs a three-op-amp current-feedback architecture with laser-trimmed 3 kΩ internal feedback resistors, enabling wide bandwidth (800 kHz at G = 100) and fast settling (1.5 µs to 0.1% at G = 100). Its balanced differential inputs, built-in gain-setting options (G = 1 or G = 100 via internal 60.6 Ω resistor), and output sense/reference terminals support high-accuracy load driving and common-mode rejection preservation.

It features distortion cancellation circuitry that maintains ultra-low THD+N across gain settings, and includes offset null pins (3 & 4), gain drive/sense terminals (2, 6, 13–15), and a copper lead frame in its plastic DIP package for enhanced thermal dissipation - critical for sustained high-output-current operation in ±25 V systems.

Key Specifications

Pinout & Package

INA103KPG4 is housed in a 16-pin plastic DIP (PDIP-N) package with 0.300″ wide body, copper lead frame for thermal efficiency, and JEDEC MS-001 compliant footprint. Pin 1 is marked by a notch or dot; leads are tin-lead (NIPDAU) finish per TI packaging data.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA103KPG4, INA114BP trades audio bandwidth and low-noise performance for superior high-Z DC precision, while AD625BN offers mechanical compatibility but sacrifices 3× bandwidth, 2× THD+N, and integrated gain configuration - making INA103KPG4 optimal for wideband, low-noise, high-swing applications.

Availability

INA103KPG4 is available at Aetrix Electronics and suitable for professional audio equipment, industrial weigh scale systems, thermocouple measurement modules, and high-fidelity sensor signal conditioning requiring stable component supply across long production lifecycles.

Supply support for INA103KPG4 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 acquired Burr-Brown in 2000 and maintains full production, qualification, and support for legacy precision analog products including the INA103 series.

The INA103 belongs to TI's high-performance instrumentation amplifier product line, designed specifically for applications demanding ultra-low noise, wide bandwidth, and exceptional DC precision in audio, test equipment, and industrial sensing.

FAQ

What is the maximum supply voltage for INA103KPG4?

The absolute maximum supply voltage for INA103KPG4 is ±25 V, with recommended operating range from ±9 V to ±25 V. Operation at ±25 V enables ±21 V output swing into 600 Ω loads per datasheet specifications. Exceeding ±25 V risks permanent damage per Absolute Maximum Ratings table. The INA103KPG4 must be operated within these limits to ensure reliability and specified performance.

Does INA103KPG4 support gain setting without external resistors?

Yes, INA103KPG4 supports factory-configured gains of G = 1 and G = 100 without external resistors. For G = 1, leave pin 14 unconnected; for G = 100, connect pin 14 to pin 6. These configurations use internal laser-trimmed 60.6 Ω and 3 kΩ resistors. External RG resistors may be added between pins 2 and 15 for other gains per G = 1 + 6kΩ/RG, but are not required for the two standard settings.

How does the output sense (pin 11) and reference (pin 7) function in INA103KPG4?

In INA103KPG4, pin 11 (Sense) and pin 7 (Ref) form a Kelvin sensing pair that closes the feedback loop at the load rather than at the IC output pin. This compensates for voltage drop across PCB traces or cables, maintaining gain accuracy even with several ohms of series resistance. Both pins must be connected with low-impedance paths - adding series resistance degrades CMRR and introduces gain error.

Can INA103KPG4 drive a 600 Ω load at ±20 V output?

Yes, INA103KPG4 can deliver ±20 V into a 600 Ω load when operated at ±25 V supplies, as confirmed in the "Output Voltage" specification table (±20 V min, ±21 V typ). Its ±40 mA continuous output current capability and current-feedback architecture ensure stable operation without external boosters. Thermal performance is supported by the copper lead frame, yielding θ_JA = 100 °C/W in the PDIP package.

What is the purpose of pins 3 and 4 on INA103KPG4?

Pins 3 (+Offset Null) and 4 (–Offset Null) on INA103KPG4 provide access to the input stage offset voltage trimming network. A 10 kΩ potentiometer connected across these pins with wiper to V– adjusts the input stage offset, enabling RTI offset reduction to <±1 µV. This adjustment is recommended for high-gain DC-coupled applications where initial offset contributes significantly to system error - such as precision weigh scale front-ends using INA103KPG4.