Texas Instruments INA188IDRJR

Overview

INA188IDRJR from Texas Instruments is a precision zero-drift instrumentation amplifier optimized for high-voltage sensor signal conditioning, featuring 55 μV max input offset voltage, 0.2 μV/°C max offset drift, and 104 dB min CMRR at G ≥10. It operates from ±2 V to ±18 V dual supply (or 4 V to 36 V single supply), delivers rail-to-rail output, and supports gain from 1 to 1000 via a single external resistor (RG) - used in bridge amplifiers, ECG front-ends, and RTD sensor interfaces.

For engineers reviewing the INA188IDRJR datasheet, INA188IDRJR pinout, INA188IDRJR application, or INA188IDRJR equivalent, this page provides verified DC precision specs (offset, drift, CMRR), RFI-filtered input architecture, thermal performance data (RθJA = 145°C/W), WSON-8 package details, and validated alternative options for medical, industrial, and portable instrumentation designs.

Technical Context

The INA188IDRJR implements a three-op-amp topology with laser-trimmed 25 kΩ internal feedback resistors, enabling its gain equation G = 1 + (50 kΩ / RG). Its auto-zeroing core delivers near-zero drift and low 12 nV/√Hz input voltage noise at 1 kHz, while RFI filtering on both inputs suppresses high-frequency interference without external components.

It features a reference input (REF) for level-shifting in single-supply operation, rail-to-rail output swing within 220 mV of rails (RL = 10 kΩ), and operates across –55°C to +150°C. Input common-mode range extends from (V–) + 0.1 V to (V+) – 1.5 V, supporting wide-swing sensor signals in high-side or low-side configurations.

Key Specifications

Pinout & Package

The INA188IDRJR is housed in an 8-pin WSON package (DRJ) with 4.00 mm × 4.00 mm body size and exposed thermal die pad on underside for enhanced heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8421ARMZ and INA128UA, the INA188IDRJR offers superior DC precision and integrated RFI rejection in a smaller WSON package - making it optimal for space-constrained, low-drift, EMC-critical applications like portable medical devices and smart sensors.

Availability

INA188IDRJR is available at Aetrix Electronics and suitable for bridge amplifiers, ECG front-ends, and RTD sensor interfaces requiring stable component supply, long-term lifecycle support, and traceable sourcing for medical and industrial OEMs.

Supply support for INA188IDRJR 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 delivering analog and embedded processing solutions, with over 90 years of innovation in precision signal chain products.

The INA188 belongs to TI's precision instrumentation amplifier product line, designed specifically for high-voltage, low-drift sensor signal conditioning in medical, test equipment, and industrial process control systems.

FAQ

What is the maximum gain achievable with INA188IDRJR?

The INA188IDRJR supports gains from 1 to 1000, set by a single external resistor RG using the equation G = 1 + (50 kΩ / RG). For G = 1000, RG = 50.05 Ω (nearest 1% value). The device maintains specified performance-including CMRR ≥104 dB and gain error ≤±0.5%-across this full range. The INA188IDRJR datasheet confirms operation up to G = 1000 with bandwidth reduced to 1.5 kHz.

Does INA188IDRJR require external RFI filtering components?

No, the INA188IDRJR integrates RFI filtering on both VIN+ and VIN− inputs as confirmed in the functional block diagram and "Features" section of the SBOS632 datasheet. This eliminates the need for external RC networks in most industrial and medical applications, reducing board area and component count. Layout guidelines still recommend short traces and proper grounding to preserve filter effectiveness.

Can INA188IDRJR operate from a single 3.3-V supply?

No - the INA188IDRJR requires a minimum single-supply voltage of 4 V, as specified in Section 6.3 (Recommended Operating Conditions). At 3.3 V, the device falls outside its guaranteed operating range and may exhibit degraded CMRR, limited output swing, or failure to meet offset specifications. For 3.3-V systems, consider TI's INA333 or ADI's AD8237 as alternatives.

What is the thermal resistance (RθJA) of the INA188IDRJR WSON package?

The INA188IDRJR in DRJ (WSON-8) package has a junction-to-ambient thermal resistance (RθJA) of 145°C/W, per Section 6.4 of the SBOS632 datasheet. This value assumes standard JEDEC 2-layer board conditions. With its exposed thermal die pad, actual thermal performance improves significantly when soldered to a copper pour - enabling reliable operation at 1.4 mA IQ across –55°C to +150°C.

How is the reference pin (REF) used in single-supply configurations?

In single-supply operation, the REF pin sets the output common-mode voltage. To achieve bipolar output swing (e.g., ±2.5 V from a 5-V supply), tie REF to V+/2 using a resistor divider or low-noise buffer. For unipolar output (0–5 V), connect REF to ground. The INA188IDRJR's REF input impedance is 40 kΩ, so driving sources must have low output impedance (<100 Ω) to avoid gain error - a key detail confirmed in Section 6.5.