Texas Instruments OPA170AID

Overview

OPA170AID from Texas Instruments is a single-channel, 36-V rail-to-rail input/output operational amplifier in SOIC-8 package, featuring 1.2 MHz gain bandwidth, 19 nV/√Hz input voltage noise at 1 kHz, 110 µA quiescent current per amplifier, and ±15 pA max input bias current. It operates from 2.7 V to 36 V (±1.35 V to ±18 V) and supports precision transducer amplification in industrial sensor interfaces.

For engineers reviewing the OPA170AID datasheet, OPA170AID pinout, OPA170AID application, or OPA170AID equivalent, this page delivers verified specifications, SOIC-8 terminal mapping, real-world use cases in strain gauge and temperature measurement circuits, and two validated alternative op amps with documented functional trade-offs.

Technical Context

The OPA170AID uses a P-channel JFET input stage enabling ultra-low input bias current (≤15 pA) and rail-to-rail input operation down to 100 mV below V– and within 2 V of V+. Its internal phase-reversal protection prevents output inversion when inputs exceed common-mode limits - a key differentiator versus standard CMOS or bipolar op amps.

Stable with capacitive loads up to 300 pF and specified across –40°C to +125°C, the device maintains 120 dB CMRR at ±18 V supply and achieves 0.4 V/µs slew rate with 20 µs settling time to 0.1% for 10-V steps - enabling reliable performance in battery-powered instrumentation and power module tracking circuits.

Key Specifications

Pinout & Package

OPA170AID is packaged in an 8-pin SOIC (D package), body size 4.90 mm × 3.91 mm, with exposed pad not present. Thermal resistance R_θJA = 149.5°C/W enables operation up to +125°C ambient in compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA170AID, OPA192IDR trades 10× higher quiescent current for 10× lower offset drift, while LM321IDBVR sacrifices noise and output swing to reduce unit cost by 40% - making OPA170AID the optimal balance for low-power, wide-supply, precision analog sensing.

Availability

OPA170AID is available at Aetrix Electronics and suitable for strain gauge amplifiers, temperature measurement circuits, and battery-powered instrumentation requiring stable component supply across extended temperature and voltage ranges.

Supply support for OPA170AID 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The OPAx170 series was designed as a value-line precision op amp family targeting cost-sensitive industrial sensing and power supply monitoring applications where 36-V operation, low power, and robust ESD tolerance are mandatory.

FAQ

What is the maximum capacitive load the OPA170AID can drive without instability?

The OPA170AID is stable with capacitive loads up to 300 pF, as confirmed in the datasheet's Detailed Description section and Typical Characteristics (Figure 23–24). This eliminates the need for isolation resistors when driving ADC input capacitors, LCD bias lines, or long PCB traces - unlike many general-purpose op amps that require external compensation beyond 50 pF.

Does the OPA170AID support true rail-to-rail input operation?

Yes, the OPA170AID supports rail-to-rail input operation: its common-mode voltage range extends from (V–) – 0.1 V to (V+) – 2 V at full performance, and it can tolerate inputs up to (V+) + 0.1 V with limited functionality. This enables direct interfacing with grounded sensors and simplifies biasing in single-supply systems - a capability explicitly verified in the Electrical Characteristics table and Figure 4.

What is the absolute maximum supply voltage rating for the OPA170AID?

The absolute maximum supply voltage for the OPA170AID is 40 V, as stated in Section 7.1 Absolute Maximum Ratings. However, the recommended operating range remains 2.7 V to 36 V. Exceeding 36 V risks parametric degradation and reduced reliability, even if the device survives short-term stress - consistent with TI's production data sheet guidance.

How does the OPA170AID handle input overvoltage conditions that cause phase reversal in other op amps?

The OPA170AID incorporates internal phase-reversal protection circuitry that prevents output inversion when inputs exceed the linear common-mode range. Instead of reversing polarity, the output saturates toward the appropriate rail - a behavior demonstrated in Figure 25 ("No Phase Reversal") and described in Section 8.3.2. This avoids catastrophic failures in closed-loop control systems using noninverting configurations.

Is the OPA170AID suitable for use in automotive under-hood applications?

Yes, the OPA170AID is qualified for operation from –40°C to +125°C and features 4 kV HBM ESD rating, meeting baseline requirements for automotive engine compartment modules. Its 36-V supply rating and 120 dB CMRR provide resilience against load dump transients and alternator noise - though system-level qualification per AEC-Q100 remains the responsibility of the end designer.