Texas Instruments OPA2171AQDRQ1

Overview

OPA2171AQDRQ1 from Texas Instruments is a dual-channel, AEC-Q100 Grade 1 qualified automotive operational amplifier with rail-to-rail output, 3 MHz gain bandwidth, ±0.3 µV/°C typical offset drift, 14 nV/√Hz input voltage noise at 1 kHz, and operation from 2.7 V to 36 V single supply - used in precision transducer signal conditioning within battery-powered vehicle control modules.

For engineers reviewing the OPA2171AQDRQ1 datasheet, OPA2171AQDRQ1 pinout, OPA2171AQDRQ1 application, or OPA2171AQDRQ1 equivalent, key selection criteria include its extended common-mode range (to V– – 0.1 V), low quiescent current (475 µA per amplifier), high CMRR (120 dB typ), CDM ESD rating of ±1000 V, and SOIC-8 packaging for automotive-grade thermal reliability.

Technical Context

The OPA2171AQDRQ1 implements a robust bipolar-input architecture optimized for wide-supply operation (2.7 V to 36 V) without phase reversal when inputs exceed rails - enabling reliable use in high-side sensing and unregulated power rail monitoring. Its internal compensation ensures stability with capacitive loads up to 300 pF, and it maintains full rail-to-rail output swing into 10 kΩ loads across –40°C to +125°C.

It features matched dual amplifiers with identical specifications: input bias current ≤15 pA, open-loop gain ≥130 dB, and THD+N ≤0.0002% at 1 kHz. The device supports both single- and dual-supply configurations and operates with input common-mode voltage extending 100 mV below V– and within 2 V of V+ under normal conditions.

Key Specifications

Pinout & Package

OPA2171AQDRQ1 is packaged in an 8-pin SOIC (D package), 4.90 mm × 3.91 mm body size, with exposed pad not present. Thermal resistance R_θJA = 116.1°C/W enables operation at full ambient temperature range with standard PCB copper area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2171AQDRQ1, OPA2182IDR delivers ultra-low drift but lacks automotive qualification, while LM2904BQDRQ1 trades precision for cost and thermal margin - making OPA2171AQDRQ1 the optimal balance of AEC-Q100 compliance, 3 MHz bandwidth, and 14 nV/√Hz noise for mid-tier automotive sensing.

Availability

OPA2171AQDRQ1 is available at Aetrix Electronics and suitable for automotive powertrain control, battery management systems, and precision industrial sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA2171AQDRQ1 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 automotive, industrial, and personal electronics markets.

The OPAx171-Q1 family was designed specifically for automotive signal conditioning applications demanding AEC-Q100 qualification, wide supply range, and precision performance in harsh environments - targeting engine control, ADAS sensors, and electric vehicle subsystems.

FAQ

What is the maximum capacitive load the OPA2171AQDRQ1 can drive without external isolation?

The OPA2171AQDRQ1 is stable with capacitive loads up to 300 pF when properly laid out (short traces, ground plane). For loads exceeding 300 pF - such as long cables or ADC input capacitance - a 25 Ω to 50 Ω series resistor must be placed between OPA2171AQDRQ1 output and the load to maintain phase margin and prevent peaking or oscillation, as verified in Figure 6-23 of the datasheet.

Does the OPA2171AQDRQ1 support true rail-to-rail input operation?

The OPA2171AQDRQ1 supports rail-to-rail output but not full rail-to-rail input: its common-mode input range extends 100 mV below V– and to within 2 V of V+ under normal operation. Operation beyond (V+) – 2 V is possible but degrades offset, CMRR, and GBW - as detailed in Table 7-1. So OPA2171AQDRQ1 does not accept signals at V+ without performance loss.

How does the OPA2171AQDRQ1 handle input overvoltage conditions that would cause phase reversal in other op amps?

The OPA2171AQDRQ1 includes internal phase-reversal protection. When input common-mode voltage exceeds the linear range (e.g., > V+ – 2 V), the output saturates toward the appropriate rail instead of inverting polarity. This behavior - confirmed in Figure 6-25 and Section 7.3.2 - prevents erroneous control signals in safety-critical automotive circuits like throttle position feedback loops.

What is the recommended minimum supply voltage for reliable operation of the OPA2171AQDRQ1?

The OPA2171AQDRQ1 is specified for operation down to 2.7 V single supply (±1.35 V dual), but the recommended minimum for full parameter compliance across temperature is 4.5 V (±2.25 V), per Section 6.3. At 2.7 V, parameters like GBW, slew rate, and output swing degrade - so OPA2171AQDRQ1 should be operated at ≥4.5 V in production automotive designs requiring guaranteed 3 MHz bandwidth and rail-to-rail output.

Is the OPA2171AQDRQ1 pin-compatible with other devices in the OPAx171-Q1 family?

No - OPA2171AQDRQ1 uses an 8-pin SOIC package with dedicated dual-amplifier pinout (V+, OUT A, –IN A, +IN A, +IN B, –IN B, OUT B, V–), while OPA171AQDRQ1 is in 5-pin SOT-23 and OPA4171AQDRQ1 is in 14-pin SOIC/TSSOP. Pin functions are not interchangeable across variants; each requires unique PCB layout. OPA2171AQDRQ1 is not a drop-in replacement for single- or quad-channel versions.