Texas Instruments OPA4340EA/250G4

Overview

OPA4340EA/250G4 from Texas Instruments is a quad rail-to-rail input/output CMOS operational amplifier optimized for single-supply, low-voltage signal conditioning. It delivers 5.5 MHz gain-bandwidth, 6 V/µs slew rate, 750 µA/channel quiescent current, and output swing within 1 mV of rails into 100-kΩ load - enabling high-fidelity buffering of ADC inputs like the ADS7816 in data acquisition systems.

For engineers reviewing the OPA4340EA/250G4 datasheet, OPA4340EA/250G4 pinout, OPA4340EA/250G4 application, or OPA4340EA/250G4 equivalent, key selection criteria include rail-to-rail I/O performance at 2.7–5.5 V supply, <500 µV typical input offset voltage, 0.0007% THD+N at 1 kHz, and SOIC-14 package compatibility with space-constrained industrial and audio front-ends.

Technical Context

The OPA4340EA/250G4 uses a complementary CMOS input stage with N- and P-channel differential pairs to achieve rail-to-rail input common-mode range extending 500 mV beyond both supply rails. Its class AB output stage enables rail-to-rail output swing while maintaining >106 dB open-loop gain at 100-kΩ load.

It is unity-gain stable and specified over –40°C to +85°C, with thermal resistance R_θJA = 83.8°C/W in SOIC-14. The device drives capacitive loads up to 1000 pF in unity-gain configuration and supports fast settling (1 µs to 0.1%) for sampling applications.

Key Specifications

Pinout & Package

OPA4340EA/250G4 is packaged in a 14-pin SOIC (D package), body size 8.65 mm × 3.91 mm, rated for –40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA4340UA/2K5, the OPA4340EA/250G4 offers identical performance in a tube-packaged variant ideal for engineering validation; versus TLV4340IPW, it provides 3× higher bandwidth, 40% lower supply current, and 4× better offset voltage - making it the preferred choice for precision, low-power, high-speed analog front-ends.

Availability

OPA4340EA/250G4 is available at Aetrix Electronics and suitable for data acquisition front-ends, portable audio interfaces, and industrial process monitoring systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for OPA4340EA/250G4 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 OPA4340EA/250G4 belongs to TI's MicroAmplifier™ series, designed specifically for single-supply, rail-to-rail signal conditioning in space- and power-constrained applications such as portable instrumentation and sensor interfaces.

FAQ

What is the operating temperature range for the OPA4340EA/250G4?

The OPA4340EA/250G4 is specified from –40°C to +85°C for commercial operation, with extended functionality from –55°C to +125°C. All key parameters-including input offset voltage, gain-bandwidth, and output swing-are guaranteed across the –40°C to +85°C range, making it suitable for industrial environments. The SOIC-14 package's thermal resistance (R_θJA = 83.8°C/W) supports reliable operation under typical PCB copper pour conditions.

Can the OPA4340EA/250G4 drive an ADS7816 12-bit ADC effectively?

Yes, the OPA4340EA/250G4 is explicitly optimized for driving sampling ADCs like the ADS7816. Its rail-to-rail output swing, 6 V/µs slew rate, and low THD+N (0.0007% at 1 kHz) ensure minimal settling error and charge injection disturbance at the ADC input. TI's reference design shows direct noninverting configuration with RC filtering, confirming full 12-bit ENOB preservation when used with the ADS7816 in 0–5 V input ranges.

What is the maximum capacitive load the OPA4340EA/250G4 can drive stably in unity-gain configuration?

The OPA4340EA/250G4 remains stable with up to 1000 pF of pure capacitive load in unity-gain configuration. For loads exceeding this-such as ADC input capacitance plus PCB trace capacitance-a small series resistor (10–20 Ω) between the output and load restores phase margin without significant DC error (e.g., <0.2% with 10-kΩ parallel load). This capability is validated in TI's SBOS073C datasheet Figure 21 and Application Note SBOA061.

Does the OPA4340EA/250G4 have shutdown functionality?

No, the OPA4340EA/250G4 does not include an enable or shutdown pin. It operates continuously whenever powered within its 2.7–5.5 V supply range. For power-gated applications, external MOSFET switching of the V+ rail or use of a pin-compatible alternative like the OPA4340T (with shutdown) is required. The absence of shutdown simplifies layout but means quiescent current (3 mA total for quad) flows at all times.

How does the rail-to-rail input stage of the OPA4340EA/250G4 behave near the supply rails?

The OPA4340EA/250G4 uses complementary N- and P-channel input pairs to extend the common-mode range 500 mV beyond both rails. Within a ~400 mV transition region near (V+) – 1.3 V, both pairs are active-potentially causing minor degradation in PSRR, CMRR, and THD. However, laser trimming minimizes offset mismatch, and operation outside this zone (e.g., 0–4.5 V on 5 V supply) ensures full-spec performance including ±150 µV offset and 92 dB CMRR.