Texas Instruments OPA4170AID

Overview

OPA4170AID from Texas Instruments is a quad, rail-to-rail output, low-noise (19 nV/√Hz), low-power (110 µA per amplifier) operational amplifier optimized for precision signal conditioning in single-supply industrial systems. It operates from 2.7 V to 36 V, supports input voltage ranges extending to both rails (–0.1 V below V– and within 2 V of V+), and delivers 1.2 MHz gain bandwidth with 120 dB CMRR - enabling high-accuracy bridge and transducer amplification in battery-powered test equipment.

For engineers reviewing the OPA4170AID datasheet, OPA4170AID pinout, OPA4170AID application, or OPA4170AID equivalent, this page provides verified specifications, SOIC-14 package details, 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 OPA4170AID implements a complementary-input-stage architecture with internal phase-reversal protection, allowing inputs to exceed the negative rail by 100 mV and approach the positive rail within 2 V without output inversion. Its 1.2 MHz GBP and 0.4 V/µs slew rate support stable closed-loop operation with capacitive loads up to 300 pF.

Specified across –40°C to +125°C, it maintains ±2 mV max input offset voltage and ±2 µV/°C max drift, while delivering rail-to-rail output swing (within 35 mV of each rail at ±18 V supply, 10 kΩ load) and ultra-low input bias current (±15 pA max at 25°C).

Key Specifications

Pinout & Package

OPA4170AID is housed in a 14-pin SOIC (D) package measuring 8.65 mm × 3.91 mm, with standard 1.27 mm pitch and exposed pad not present. This surface-mount package supports automated assembly and meets IPC-7351B footprint requirements for thermal reliability in industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA4170AID, OPA4182AID trades 4× higher quiescent current for 36× lower offset drift, while LM324DR sacrifices rail-to-rail output, temperature range, and noise performance to reduce unit cost by ~40% - making OPA4170AID the optimal balance for industrial-grade 16-bit sensor interfaces.

Availability

OPA4170AID is available at Aetrix Electronics and suitable for industrial automation, test and measurement equipment, and battery-powered instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for OPA4170AID 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 over 50 years of innovation in precision op amps and power management ICs.

The OPAx170 series was designed specifically for cost-sensitive industrial applications demanding rail-to-rail output, low power, and robust operation across –40°C to +125°C - filling the gap between general-purpose and high-precision op amps.

FAQ

What is the maximum capacitive load the OPA4170AID can drive without instability?

The OPA4170AID is specified to remain stable with capacitive loads up to 300 pF when configured as a unity-gain buffer. This eliminates the need for external isolation resistors in most ADC driver and cable-driving applications. For loads exceeding 300 pF, a small series resistor (10–50 Ω) between the output and the capacitor is recommended to maintain phase margin. The OPA4170AID's internal compensation is optimized for this behavior across its full supply and temperature range.

Does the OPA4170AID support true rail-to-rail input operation?

The OPA4170AID supports input voltages from V– – 0.1 V to V+ – 2 V under normal operation. While it can tolerate inputs up to V+ (with reduced performance within 2 V of V+), it does not provide full rail-to-rail input common-mode range. Its key advantage is operation *including* the negative rail - enabling grounded-sensor interfaces - combined with rail-to-rail *output* swing, which the OPA4170AID delivers within 35 mV of both rails at ±18 V supply.

What is the typical quiescent current of the OPA4170AID at 3.3 V supply?

At 3.3 V supply and 25°C, the OPA4170AID draws 110 µA per amplifier (440 µA total for all four channels), matching its specification at higher voltages. This value is confirmed in TI's SBOS557E datasheet Section 7.7, and remains stable across the 2.7–36 V range - making it ideal for low-voltage battery-powered systems where supply headroom is limited.

Can the OPA4170AID replace the LM324 in existing designs without layout changes?

No - the OPA4170AID uses a 14-pin SOIC package, while the LM324 uses a 14-pin SOIC *but with different pin mapping*. Specifically, LM324 pin 1 is OUT A, whereas OPA4170AID pin 1 is also OUT A, but the V– and V+ positions differ (LM324: V– = pin 11, V+ = pin 4; OPA4170AID: V– = pin 11, V+ = pin 4 - same pinout). However, due to differences in input stage architecture and lack of phase reversal protection in LM324, direct replacement requires validation of input common-mode range and stability with existing feedback networks.

What is the ESD tolerance of the OPA4170AID inputs?

The OPA4170AID features ±4000 V HBM (Human Body Model) and ±750 V CDM (Charged Device Model) ESD protection on all pins, per JEDEC standards JS-001 and JESD22-C101. This level of protection enables safe handling in standard manufacturing environments without additional external TVS diodes - though transient suppression remains recommended in high-noise industrial settings per TI's layout guidelines.