Texas Instruments OPA704PA

Overview

OPA704PA from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for non-inverting gains ≥5. It delivers 3MHz gain-bandwidth product, 3V/µs slew rate, 160µA quiescent current, ±160µV input offset voltage, and operates from ±2V to ±6V dual supplies (or 4V–12V single supply). It is used in precision transducer amplification and active filter stages where speed and low power coexist.

For engineers reviewing the OPA704PA datasheet, OPA704PA pinout, OPA704PA application, or OPA704PA equivalent, this page provides verified package mapping (DIP-8), confirmed pin functions, real-world application context for automotive sensor interfaces and portable test equipment, and two validated alternative parts with documented performance trade-offs.

Technical Context

The OPA704PA uses a complementary input stage enabling rail-to-rail common-mode input range extending 300mV beyond rails, and a Class AB output stage delivering 40mV rail-to-rail swing into 100kΩ. Its internal compensation is optimized for stable operation at closed-loop gains of 5 or greater - unlike the unity-gain-stable OPA703 family.

It features ultra-low input bias current (±1pA typ), high open-loop gain (120dB), and full-scale CMRR of 90dB. The device is specified over –40°C to +85°C and supports capacitive loads up to 1000pF when operating at G ≥ 5, with typical settling time of 18µs (0.1%) under those conditions.

Key Specifications

Pinout & Package

DIP-8 package (dual in-line through-hole), 0.3" wide body, standard 0.1" pin pitch, RoHS-compliant lead finish (NIPDAU), rated for –40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA704PA, OPA2704UA offers channel integration at no AC performance penalty but increases board area footprint, while TLV2782CDR trades offset accuracy and stability margin for lower unit cost in high-volume consumer-grade signal chains.

Availability

OPA704PA is available at Aetrix Electronics and suitable for automotive sensor interfaces, portable data acquisition systems, and active filter designs requiring stable component supply with long-term DIP-8 through-hole compatibility.

Supply support for OPA704PA 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 amp design and manufacturing.

The OPA704PA belongs to TI's precision rail-to-rail CMOS op amp family, engineered for low-power, high-accuracy signal conditioning in automotive, industrial, and portable measurement systems.

FAQ

What is the minimum recommended gain for stable operation of the OPA704PA?

The OPA704PA is internally compensated for stable operation at closed-loop gains of 5 or greater. Using it at gains below 5 - such as unity-gain buffer or G = 2 configurations - may result in peaking, overshoot, or oscillation. For G < 5 applications, TI recommends the OPA703PA instead, which is unity-gain stable. Always verify stability with actual layout and load conditions using the "Small-Signal Overshoot vs Capacitive Load" curves in the OPA704 datasheet.

Does the OPA704PA support true rail-to-rail input common-mode range?

Yes, the OPA704PA supports rail-to-rail input with common-mode voltage range extending 300mV beyond both supply rails (e.g., –0.3V to V+ + 0.3V at room temperature). This is achieved via a complementary N/P-channel input stage. However, within a ~500mV transition region near mid-supply, parameters like PSRR, CMRR, and offset may vary slightly - consult Figure 2 and the Applications Information section of the OPA704 datasheet for design guidance.

Can the OPA704PA drive heavy capacitive loads, and what is the maximum value?

The OPA704PA can reliably drive up to 1000pF of pure capacitive load when configured for gains ≥5, as confirmed in the "Small-Signal Overshoot vs Capacitive Load" typical curve. At G = 5, overshoot remains <10% up to 1000pF. For loads exceeding this or for unity-gain use, external compensation (e.g., series resistor in feedback path) is required. Do not exceed 1000pF without verifying stability in your specific layout and load configuration.

What is the thermal resistance (θJA) of the OPA704PA in its DIP-8 package?

The OPA704PA in PDIP-8 package has a junction-to-ambient thermal resistance (θJA) of 100°C/W, as specified in the Absolute Maximum Ratings table of the OPA704 datasheet. This value assumes standard JEDEC 2-layer board conditions. In practice, adding copper pour and thermal vias beneath the package can reduce effective θJA by 20–30%, improving reliability in continuous +85°C ambient environments.

Is the OPA704PA pin-compatible with the OPA703PA?

No, the OPA704PA is not pin-compatible with the OPA703PA. Although both are DIP-8 packaged single op amps, their internal compensation and gain-phase response differ fundamentally: OPA703PA is unity-gain stable, while OPA704PA is optimized for G ≥ 5. Swapping them without circuit revalidation risks instability. Their pinouts match electrically (same V+, V–, In+, In–, Out), but functional compatibility requires matching gain configuration and stability analysis - never assume drop-in replacement.