Texas Instruments OPA4705EA/2K5

Overview

OPA4705EA/2K5 from Texas Instruments is a quad, rail-to-rail input/output CMOS operational amplifier optimized for low-power, precision signal conditioning in space-constrained systems. It delivers 1 MHz gain-bandwidth, 0.6 V/µs slew rate, 0.5 mV max input offset voltage, 160 µA per amplifier quiescent current, and operates from ±2 V to ±6 V dual supplies or 4 V to 12 V single supply - used in automotive sensor interfaces and portable data acquisition.

For engineers reviewing the OPA4705EA/2K5 datasheet, OPA4705EA/2K5 pinout, OPA4705EA/2K5 application, or OPA4705EA/2K5 equivalent, key selection considerations include its TSSOP-14 package, guaranteed rail-to-rail I/O swing (within 40 mV of rails at light load), 1 pA typical input bias current, –40°C to +85°C temperature range, and unity-gain stability without external compensation.

Technical Context

The OPA4705EA/2K5 employs a complementary differential input stage enabling rail-to-rail common-mode input range extending 300 mV beyond both supply rails, with a 500 mV transition region where both N- and P-channel pairs conduct. Its class AB output stage supports rail-to-rail output swing down to 40 mV from rails under 100 kΩ load while maintaining >80 dB open-loop gain.

It features a unity-gain stable architecture with 1 MHz GBW and 0.6 V/µs slew rate, specified over full industrial temperature range (–40°C to +85°C) and supply range (±2 V to ±6 V). Input protection includes ESD diodes clamping to rails, tolerating ±0.3 V overvoltage with ≤10 mA current limiting.

Key Specifications

Pinout & Package

TSSOP-14 surface-mount package (JEDEC PW drawing), 5.0 mm × 4.4 mm × 1.2 mm body, 0.65 mm pitch, moisture sensitivity level 2 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad rail-to-rail operational amplifier applications.

Compared with TLV2474IDR and MCP6004-E/SL, the OPA4705EA/2K5 uniquely balances 1 MHz bandwidth, 0.5 mV offset, and 160 µA IQ in a TSSOP-14 package - making it optimal for automotive and portable applications requiring precision, low power, and space efficiency without thermal derating.

Availability

OPA4705EA/2K5 is available at Aetrix Electronics and suitable for automotive sensor interfaces, portable data acquisition systems, active filter banks, and transducer signal conditioning requiring stable component supply across production lifecycles.

Supply support for OPA4705EA/2K5 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 OPA705 family - including OPA4705EA/2K5 - was designed for cost-sensitive, low-power applications demanding rail-to-rail I/O, high input impedance, and robust performance across automotive and industrial temperature ranges.

FAQ

What is the maximum capacitive load the OPA4705EA/2K5 can drive stably?

The OPA4705EA/2K5 can drive up to 1000 pF of pure capacitive load while maintaining stability. For unity-gain configurations with >100 pF load, TI recommends adding a 10 Ω to 20 Ω series resistor inside the feedback loop to suppress ringing. This technique preserves DC accuracy while improving transient response - verified in the SBOS182A datasheet Figure 5. The OPA4705EA/2K5's internal compensation ensures no external components are needed for resistive loads.

Does the OPA4705EA/2K5 exhibit phase inversion when input voltages exceed the supply rails?

No, the OPA4705EA/2K5 does not exhibit phase inversion when inputs exceed the supply rails, provided input current is limited to ≤10 mA - a condition easily met using a series current-limiting resistor. This behavior is confirmed in SBOS182A Figure 4 and stems from its ESD-protected complementary input stage. Unlike older op-amps, the OPA4705EA/2K5 maintains correct polarity even during overvoltage transients, enhancing reliability in automotive and industrial sensor front-ends.

What is the output voltage swing specification for the OPA4705EA/2K5 at 20 kΩ load?

At a 20 kΩ load and with open-loop gain >100 dB, the OPA4705EA/2K5 output swings to within 75 mV of each supply rail - meaning a ±5 V supply yields ≥±4.925 V output swing. This is specified in the Electrical Characteristics table under "Voltage Output Swing from Rail" and validated in the "Output Voltage Swing vs Output Current" typical curve (SBOS182A Page 6). The swing degrades to 150 mV at 5 kΩ load, supporting moderate drive requirements without external buffers.

Is the OPA4705EA/2K5 RoHS compliant and lead-free?

Yes, the OPA4705EA/2K5 is RoHS compliant and lead-free, with "Green (RoHS & no Sb/Br)" eco plan and "NIPDAU" lead finish per TI's Package Option Addendum. It meets JEDEC MSL Level-2-260°C-1 year and is qualified for reflow soldering at peak temperatures up to 260°C. The device marking "OPA4705EA" appears on the top surface of the TSSOP-14 package, and full compliance documentation is available via TI's Quality & Environmental page.

How does the OPA4705EA/2K5 handle common-mode voltage beyond the supply rails?

The OPA4705EA/2K5 input common-mode range extends 300 mV beyond both supply rails (V– –0.3 V to V+ +0.3 V), enabled by its complementary N- and P-channel input stage. Within the 500 mV transition region near mid-supply, parameters like PSRR, CMRR, and offset may vary - detailed in SBOS182A Section "RAIL-TO-RAIL INPUT". For reliable operation, keep critical DC signals outside this region or verify performance in-system, especially in automotive applications with noisy ground returns.