Texas Instruments OPA4170AIPW

Overview

OPA4170AIPW from Texas Instruments is a quad, rail-to-rail output, low-power operational amplifier optimized for single-supply operation from 2.7 V to 36 V (±1.35 V to ±18 V), featuring 1.2 MHz gain bandwidth, 19 nV/√Hz input voltage noise at 1 kHz, 110 µA quiescent current per amplifier, and rail-to-rail input capability extending 100 mV beyond the positive supply. It serves precision signal conditioning in battery-powered instruments and transducer interfaces.

For engineers reviewing the OPA4170AIPW datasheet, OPA4170AIPW pinout, OPA4170AIPW application, or OPA4170AIPW equivalent, key selection criteria include its 120 dB common-mode rejection at ±18 V, ±15 pA maximum input bias current, stable operation with up to 300 pF capacitive loads, and guaranteed performance across –40°C to +125°C.

Technical Context

The OPA4170AIPW employs a CMOS input stage enabling ultra-low input bias current 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 the common-mode range-critical in noninverting configurations with wide-swing signals.

It delivers 0.4 V/µs slew rate and 20 µs 0.1% settling time for 10-V steps under ±18 V supplies, with open-loop gain ≥110 dB over temperature and supply variations. The device is specified across full industrial temperature range and supports stable unity-gain operation without external compensation.

Key Specifications

Pinout & Package

OPA4170AIPW is housed in a 14-pin TSSOP package (PW) with body dimensions 5.00 mm × 4.40 mm and 0.65 mm lead pitch. Thermal resistance R_θJA is 106.9°C/W, supporting moderate power dissipation in compact layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA4170AIPW, OPA4182AIPW trades 4× higher quiescent current for 10× lower offset and 8× higher bandwidth, while LM324DR offers lower cost at the expense of 100× higher input bias current and no rail-to-rail input capability-making OPA4170AIPW optimal for low-power, high-precision, wide-temperature industrial sensing.

Availability

OPA4170AIPW is available at Aetrix Electronics and suitable for transducer amplifiers, bridge circuits, temperature measurement systems, and battery-powered instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA4170AIPW 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, high-voltage, low-power op amp family targeting cost-sensitive yet performance-critical applications including sensor signal chains, power module monitoring, and portable test equipment.

FAQ

What is the maximum capacitive load the OPA4170AIPW can drive without instability?

The OPA4170AIPW is specified to remain stable with capacitive loads up to 300 pF, as confirmed in the datasheet's Electrical Characteristics table and Typical Characteristics section. This eliminates the need for external isolation resistors when driving ADC inputs or long PCB traces. For loads exceeding 300 pF, a small series resistor (e.g., 10–50 Ω) at the output is recommended to maintain phase margin. The OPA4170AIPW's internal compensation ensures this stability across its full supply and temperature range.

Does the OPA4170AIPW support true rail-to-rail input operation?

Yes-the OPA4170AIPW supports rail-to-rail input operation, with common-mode voltage range extending from (V–) – 0.1 V to (V+) – 2 V for normal operation. Crucially, it can accept inputs up to 100 mV beyond V+ (i.e., V+ + 0.1 V) with reduced performance, as documented in the datasheet's Description and Electrical Characteristics sections. This overvoltage tolerance simplifies design in systems where input transients may exceed the supply rails, such as in motor current sensing or fault-detection circuits.

What is the typical quiescent current per amplifier in the OPA4170AIPW at room temperature?

The typical quiescent current per amplifier in the OPA4170AIPW is 110 µA at TA = 25°C and VS = ±18 V, as specified in Section 7.7 of the SBOS557E datasheet. Maximum current is 145 µA under those conditions, and across the full operating temperature range (–40°C to +125°C), it rises to 155 µA. This ultra-low IQ enables four-channel operation at under 620 µA total, making the OPA4170AIPW well-suited for always-on, energy-constrained applications.

How does the OPA4170AIPW handle input overvoltage conditions that could cause phase reversal?

The OPA4170AIPW incorporates internal phase-reversal protection, explicitly described in Section 8.3.2 of the datasheet. Unlike conventional op amps, it prevents output inversion when inputs exceed the linear common-mode range-instead, the output limits gracefully into the appropriate supply rail. This behavior is verified in Figure 25 ("No Phase Reversal") and ensures reliable operation in noninverting configurations subjected to transient overvoltage, such as in power supply tracking or sensor fault scenarios.

Is the OPA4170AIPW qualified for operation at +125°C ambient temperature?

Yes-the OPA4170AIPW is fully specified and guaranteed for operation from –40°C to +125°C ambient temperature, as stated in Section 7.3 (Recommended Operating Conditions) and confirmed in the Device Information table. All key parameters-including offset voltage, CMRR, PSRR, and gain bandwidth-are characterized across this range. This qualification makes the OPA4170AIPW suitable for under-hood automotive, industrial motor drives, and outdoor infrastructure applications without derating.