Texas Instruments OPA703NA/250

Overview

OPA703NA/250 from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-power, medium-speed signal conditioning in 4V–12V single-supply or ±2V–±6V dual-supply systems. It delivers 1MHz gain-bandwidth, 0.6V/µs slew rate, 160µA quiescent current, 160µV max input offset voltage, and 90dB full-scale CMRR - enabling precision buffering in portable data acquisition front-ends.

For engineers reviewing the OPA703NA/250 datasheet, OPA703NA/250 pinout, OPA703NA/250 application, or OPA703NA/250 equivalent, key selection considerations include unity-gain stability, 40mV rail-to-rail output swing at light loads, 1pA input bias current for high-impedance sensor interfacing, and SOT23-5 packaging for space-constrained PCB layouts.

Technical Context

The OPA703NA/250 employs a complementary differential input stage (N- and P-channel pairs) to achieve rail-to-rail common-mode input range extending 300mV beyond supply rails, with no phase inversion when inputs exceed supplies under current-limited conditions. Its class-AB output stage supports 40mV output swing to rails into 100kΩ loads while maintaining >80dB open-loop gain.

Specified over –40°C to +85°C, it features 45nV/√Hz input voltage noise density at 1kHz, 6µV_P-P 0.1Hz–10Hz noise, and 120dB open-loop DC gain (RL = 100kΩ), making it suitable for DC-coupled transducer amplification where low drift and high PSRR are critical.

Key Specifications

Pinout & Package

SOT23-5 surface-mount package (5-pin, 2.9mm × 1.6mm footprint) with exposed pad for thermal enhancement; RoHS-compliant, NIPDAU lead finish, MSL Level-2-260°C-1 year.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA333AIDBVR and MCP6001T-E/OT, the OPA703NA/250 uniquely balances 1MHz bandwidth, 160µA IQ, and true rail-to-rail I/O in SOT23-5 - making it optimal for portable instrumentation requiring both speed and ultra-low power without zero-drift complexity or bandwidth sacrifice.

Availability

OPA703NA/250 is available at Aetrix Electronics and suitable for portable data acquisition, automotive sensor interface, and active filter designs requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for OPA703NA/250 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 decades of expertise in precision op amps and signal chain solutions.

The OPA703NA/250 belongs to TI's precision CMOS op amp product line, designed specifically for low-power, rail-to-rail signal conditioning in space- and energy-constrained applications such as portable test equipment and automotive sensor nodes.

FAQ

What is the maximum capacitive load the OPA703NA/250 can drive stably?

The OPA703NA/250 can drive up to 1000pF of pure capacitive load stably when configured for gains ≥5. In unity-gain configurations, stability with large capacitive loads requires adding a 10Ω–20Ω series resistor inside the feedback loop. This maintains DC accuracy while suppressing ringing - a technique validated in TI's SBOS180A datasheet Figure 5. The OPA703NA/250's internal compensation ensures robustness without external components in standard G=1 buffer applications with CL ≤ 100pF.

Does the OPA703NA/250 support single-supply operation?

Yes, the OPA703NA/250 supports single-supply operation from 4V to 12V, with rail-to-rail input and output swing enabling full dynamic range utilization. Its input common-mode range extends 300mV beyond both supply rails, and output swings to within 40mV of each rail into 100kΩ loads. This makes the OPA703NA/250 ideal for 3.3V and 5V systems where traditional op amps would clip or distort near supply boundaries.

What is the temperature range specification for the OPA703NA/250?

The OPA703NA/250 is fully specified and guaranteed over the industrial temperature range of –40°C to +85°C. Its absolute maximum ratings extend to –55°C to +125°C for operating temperature and –65°C to +150°C for storage, with junction temperature limited to +150°C. Key parameters including offset voltage (±160µV max), CMRR (90dB full-scale), and quiescent current (160–200µA) are tested and warranted across the –40°C to +85°C range per SBOS180A.

How does the OPA703NA/250 compare to the OPA704NA/250 in terms of gain stability?

The OPA703NA/250 is unity-gain stable, whereas the OPA704NA/250 is optimized for gains ≥5 and is not unity-gain stable. The OPA703NA/250 achieves 1MHz GBW and 0.6V/µs slew rate with internal compensation that ensures stability at G=1, while the OPA704NA/250 trades off low-gain stability for higher 3MHz GBW and 3V/µs slew rate at G≥5. Using OPA704NA/250 at G=1 risks oscillation and must be avoided unless externally compensated.

Is the OPA703NA/250 pin-compatible with other SOT23-5 op amps?

The OPA703NA/250 uses the industry-standard SOT23-5 pinout (V–, +In, –In, Out, V+) and is pin-compatible with common single-op-amp SOT23-5 devices like the TLV2461, MCP6001, and OPA348. However, electrical behavior differs significantly: the OPA703NA/250 offers superior CMRR (90dB), lower IB (1pA), and rail-to-rail I/O versus many alternatives. Layout reuse is possible, but circuit validation is required due to differences in bandwidth, noise, and stability criteria.