Texas Instruments INA333SJD

Overview

INA333SJD from Texas Instruments is a micro-power, zero-drift instrumentation amplifier optimized for extreme-temperature operation (–55°C to +210°C), featuring 25 μV max input offset voltage (G ≥100), 0.2 μV/°C drift (G ≥1000), 100 dB min CMRR (G ≥10), rail-to-rail output swing, and 198 μA quiescent current - deployed in down-hole drilling sensor signal conditioning.

For engineers reviewing the INA333SJD datasheet, INA333SJD pinout, INA333SJD application, or INA333SJD equivalent, this page delivers verified specifications, MSOP-8 package layout, high-temperature performance boundaries, gain-setting resistor guidance, and real-world substitution options for harsh-environment analog front-ends.

Technical Context

The INA333SJD implements a 3-op-amp architecture with auto-calibration circuitry operating at 350 kHz, correcting offset every 8 μs without aliasing or flicker noise penalty. Its RFI-filtered inputs integrate passive RC networks (8 MHz corner) to suppress RF-induced offset shifts.

Gain is set externally via single resistor RG between pins 1 and 8 using G = 1 + (100 kΩ/RG); internal laser-trimmed 150 kΩ feedback resistors ensure accuracy and low temperature drift. Input common-mode range extends from (V–) + 0.1 V to (V+) – 0.1 V, while output swings from (V–) + 0.05 V to (V+) – 0.05 V.

Key Specifications

Pinout & Package

INA333SJD is packaged in an 8-pin MSOP (JD) with exposed thermal pad, rated for –55°C to +210°C operation. Thermal resistance θJA is 83.4°C/W (no airflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA333AIDR, INA333SJD delivers guaranteed 210°C operation and enhanced RFI rejection at the cost of slightly reduced bandwidth; versus AD8421ARZ, it trades speed and raw noise performance for 4× lower quiescent current and full extreme-temperature qualification.

Availability

INA333SJD is available at Aetrix Electronics and suitable for down-hole drilling, high-temperature industrial monitoring, and low-power remote telemetry requiring stable component supply across extended temperature lifecycles.

Supply support for INA333SJD 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 deep expertise in high-reliability, high-temperature IC design.

The INA333 product line was engineered specifically for precision signal conditioning in extreme environments - targeting oil & gas, aerospace, and geothermal applications where conventional amplifiers fail.

FAQ

What is the maximum operating temperature of the INA333SJD?

The INA333SJD is fully specified and qualified for continuous operation from –55°C to +210°C. This extreme temperature range is validated per TI's high-temperature product standards, including extended life testing and electromigration modeling. The INA333SJD maintains all key parameters - including 25 μV offset voltage and 100 dB CMRR - across this full range, making it suitable for down-hole drilling tools and turbine monitoring systems where ambient temperatures exceed 200°C.

Does the INA333SJD require external capacitors for stability?

Yes, the INA333SJD requires 0.1 μF ceramic bypass capacitors placed as close as possible to pins 4 (V−) and 7 (V+), per TI's layout guidelines. Additionally, parasitic capacitance at the RG pins (1 and 8) must be kept below a few picofarads to maintain CMRR vs. frequency performance. No compensation capacitor is needed for gains ≤100, but for G > 100 at 210°C, TI recommends adding a 3.5 kΩ resistor in series with a 10 nF capacitor to ground at each RG pin to ensure stability.

Can the INA333SJD operate from a single 3.0-V supply?

Yes, the INA333SJD operates from +1.8 V to +5.5 V single supply. At 3.0 V, its input common-mode range is (V−) + 0.1 V to (V+) – 0.1 V (i.e., 0.1 V to 2.9 V), and output swings from (V−) + 0.05 V to (V+) – 0.05 V (i.e., 0.05 V to 2.95 V). For proper linear operation, VIN+ and VIN− must both remain within this input range - e.g., biasing REF to 1.5 V and ensuring sensor outputs stay centered accordingly. The INA333SJD's rail-to-rail output maximizes usable dynamic range under these conditions.

How is gain set on the INA333SJD, and what resistor values are recommended for G = 100?

Gain is set by a single external resistor RG connected between pins 1 and 8, using the equation G = 1 + (100 kΩ/RG). For G = 100, RG = 1.01 kΩ; the nearest standard 1% value is 1.00 kΩ. TI's datasheet Table 2 confirms 1.00 kΩ yields nominal G = 101. Layout best practices require matched, short traces to both RG pins and avoidance of solder mask slivers that could add parasitic capacitance. At 210°C, use metal-film or thin-film resistors with low TCR (<50 ppm/°C) to maintain gain accuracy.

Is the INA333SJD pin-compatible with other variants like INA333AIDR?

Yes, the INA333SJD is pin-compatible with the industrial-grade INA333AIDR (SOIC-8) and INA333AIDBVR (SOT-23-8), sharing identical pin functions and gain equation. However, the JD package (MSOP-8) has different footprint dimensions and thermal characteristics. While electrical interface is identical, PCB layout must accommodate the smaller MSOP-8 body and exposed thermal pad. No changes to schematic or firmware are required when substituting INA333SJD into designs originally using INA333AIDR - provided temperature and RFI requirements align.