Texas Instruments OPA2170AIDCUR

Overview

OPA2170AIDCUR from Texas Instruments is a dual-channel, 36-V, rail-to-rail output operational amplifier in an 8-pin VSSOP (micro size) package, featuring 1.2 MHz gain bandwidth, 19 nV/√Hz input voltage noise, 110 µA per amplifier quiescent current, and rail-to-rail input operation down to the negative supply and within 2 V of the positive supply. It is designed for precision signal conditioning in battery-powered instruments and transducer interfaces.

For engineers reviewing the OPA2170AIDCUR datasheet, OPA2170AIDCUR pinout, OPA2170AIDCUR application, or OPA2170AIDCUR equivalent, this page delivers verified specifications, validated dual-amplifier pin functions, real-world use cases in strain gauge and temperature measurement systems, and two confirmed alternative parts with documented functional and packaging differences.

Technical Context

The OPA2170AIDCUR implements a CMOS input stage with phase-reversal protection, enabling stable operation when inputs exceed the common-mode range - unlike conventional op amps. Its architecture supports single-supply operation from 2.7 V to 36 V (±1.35 V to ±18 V) and maintains 120 dB CMRR at ±18 V across –40°C to +125°C.

It delivers rail-to-rail output swing (within 35 mV of rails at ±18 V, 10 kΩ load), 0.4 V/µs slew rate, and 20 µs 0.1% settling time for 10-V steps. The device drives capacitive loads up to 300 pF without instability and exhibits <15 pA max input bias current and ±2 mV max input offset voltage over temperature.

Key Specifications

Pinout & Package

OPA2170AIDCUR is housed in an 8-pin VSSOP package with micro footprint (2.30 mm × 2.00 mm), optimized for space-constrained PCB layouts while maintaining thermal performance (R_θJA = 175.2°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel precision operational amplifier applications.

Compared with OPA2170AIDCUR, OPA2182AIDR trades 4× higher quiescent current for 3.3× lower noise and 50× lower offset, while LMV358IDGKR sacrifices voltage range, temperature rating, and noise performance for lower unit cost and smaller footprint in consumer-grade designs.

Availability

OPA2170AIDCUR is available at Aetrix Electronics and suitable for precision instrumentation, industrial sensor interfaces, and battery-powered test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA2170AIDCUR 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 delivering analog and embedded processing solutions, with deep expertise in precision amplifiers, data converters, and power management ICs.

The OPAx170 series was engineered specifically for cost-sensitive, high-reliability industrial and instrumentation applications demanding wide supply range, low power, and robust input protection - without sacrificing DC precision.

FAQ

What is the maximum capacitive load the OPA2170AIDCUR can drive stably?

The OPA2170AIDCUR is specified to remain stable with capacitive loads up to 300 pF when configured in unity-gain buffer mode. This capability eliminates the need for external isolation resistors in many ADC driver and cable-driving applications. For loads exceeding 300 pF, a small series resistor (e.g., 10–50 Ω) at the output is recommended to maintain phase margin. The OPA2170AIDCUR's internal compensation ensures consistent behavior across its full 2.7–36 V supply range and –40°C to +125°C operating temperature.

Does the OPA2170AIDCUR support true rail-to-rail input operation?

Yes - the OPA2170AIDCUR supports input voltages from 100 mV below V– to within 2 V of V+, enabling true ground-referenced input operation in single-supply systems. While it can accept inputs up to the positive rail (V+), full-spec performance (e.g., CMRR, offset) is guaranteed only up to V+ – 2 V. This design allows direct interfacing with sensors whose outputs swing to ground or near-VDD without level-shifting circuitry, simplifying front-end design for strain gauges and thermistors.

What is the thermal resistance (RθJA) of the OPA2170AIDCUR in its VSSOP (micro size) package?

The OPA2170AIDCUR in the DCU package (VSSOP micro size, 2.30 mm × 2.00 mm) has a junction-to-ambient thermal resistance (RθJA) of 175.2°C/W under standard JEDEC JESD51-7 PCB conditions. This value reflects its compact footprint and efficient thermal path to the PCB via exposed pad (though the DCU variant does not include a thermal pad). Designers should verify board layout - especially copper area under pins 4 (V–) and 8 (V+) - to achieve rated thermal performance in high-ambient or high-power-density applications.

Can the OPA2170AIDCUR be used in automotive applications?

The OPA2170AIDCUR is qualified for operation from –40°C to +125°C and meets AEC-Q100 stress test requirements for temperature cycling, HTOL, and ESD - making it suitable for under-hood and cabin electronics where ambient temperatures reach 105°C. Its 36-V rating supports 24-V commercial vehicle systems, and its phase-reversal immunity enhances reliability in noisy alternator environments. However, TI does not classify it as an AEC-Q100 Grade 0 or 1 part; designers targeting ASIL-B/C systems must perform additional FMEDA and validation per ISO 26262.

How does the OPA2170AIDCUR handle input overvoltage beyond the supply rails?

The OPA2170AIDCUR incorporates internal phase-reversal protection that prevents output inversion when inputs exceed the common-mode range - a failure mode common in standard op amps. Instead of reversing polarity, the output saturates cleanly into the appropriate rail. This behavior is validated across –40°C to +125°C and all supply voltages (2.7–36 V). Input pins tolerate voltages from (V–) – 0.5 V to (V+) + 0.5 V per Absolute Maximum Ratings, but sustained operation outside the recommended common-mode range (V– – 0.1 V to V+ – 2 V) may degrade DC accuracy and noise performance.