Texas Instruments OPA835IRUNR

Overview

OPA835IRUNR from Texas Instruments is a single-channel, ultra-low-power, rail-to-rail output, negative-rail input voltage-feedback operational amplifier in a 10-pin QFN (RUN) package. It delivers 56 MHz bandwidth, 160 V/µs slew rate, and 250 µA quiescent current per channel at 5 V supply, with integrated gain-setting resistors enabling configurable gains from –7 to +8 - ideal for space-constrained, battery-powered signal conditioning in portable instrumentation.

For engineers reviewing the OPA835IRUNR datasheet, OPA835IRUNR pinout, OPA835IRUNR application, or OPA835IRUNR equivalent, this page provides verified technical context, validated pin functions, confirmed gain-resistor topology, real-world application mappings, and two rigorously cross-checked alternative op amps - all specific to the OPA835IRUNR variant and its QFN-10 RUN package.

Technical Context

The OPA835IRUNR implements a voltage-feedback architecture with internal 2.4 kΩ, 1.8 kΩ, and 600 Ω precision gain-setting resistors connected between FB1–FB2–FB3–FB4 pins, enabling 16 discrete non-inverting and inverting gain configurations via PCB trace routing. Its negative-rail input stage supports common-mode voltage down to –0.2 V (at 5 V supply), while rail-to-rail output delivers ±40 mA drive into 2 kΩ load.

It operates across –40°C to +125°C, draws only 0.5 µA in power-down mode (PD pin low), and achieves –130 dBc THD at 1 kHz with 1 VRMS output - confirming suitability for high-fidelity, low-power ADC driver and audio buffer roles where spectral purity and supply efficiency are co-critical.

Key Specifications

Pinout & Package

OPA835IRUNR uses a 10-pin QFN package (RUN), 2.00 mm × 2.00 mm body, 0.5-mm pitch, wettable flank terminations, and exposed thermal pad (connected to VS–). The RUN variant uniquely integrates four precision feedback resistors (FB1–FB4) for programmable gain.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power, high-speed op amp applications.

Compared with OPA365AIDBVR and LMH6612MMX/NOPB, the OPA835IRUNR uniquely combines sub-300 µA quiescent current, 56 MHz bandwidth, and on-die gain resistors in a 2 mm × 2 mm QFN - making it the only option that simultaneously satisfies space, power, and configurability constraints in portable precision signal chains.

Availability

OPA835IRUNR is available at Aetrix Electronics and suitable for portable medical devices, ultrasonic flow meters, battery-powered data loggers, and high-density sensor nodes requiring stable component supply with full lifecycle support.

Supply support for OPA835IRUNR 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 op amp innovation and broad automotive, industrial, and personal electronics reach.

The OPA835IRUNR belongs to TI's OPAx835 family of ultra-low-power, high-speed voltage-feedback op amps - engineered specifically for battery-constrained, high-fidelity signal conditioning in portable instrumentation and precision sensing.

FAQ

What is the package type and footprint of OPA835IRUNR?

OPA835IRUNR uses a 10-pin QFN package (RUN variant) with 2.00 mm × 2.00 mm body size, 0.5-mm pitch, and wettable flank terminations. Its footprint is distinct from the SOT-23 (DBV) version and includes four dedicated FB pins for gain configuration - documented in Figure 6-5 of the OPA835 datasheet. The exposed thermal pad must be soldered to a PCB ground plane for thermal and electrical performance.

Does OPA835IRUNR support true rail-to-rail input?

No - OPA835IRUNR features negative-rail input (accepts voltages down to –0.2 V with 5 V supply) and rail-to-rail output, but its input common-mode range does not extend to the positive rail. At 5 V supply, the maximum input voltage is 3.9 V. This architecture optimizes input stage headroom and distortion performance while enabling ground-referenced signal acquisition, unlike full rail-to-rail input op amps.

How do the integrated gain-setting resistors in OPA835IRUNR work?

OPA835IRUNR integrates three precision thin-film resistors (2.4 kΩ, 1.8 kΩ, 600 Ω) connected between FB1–FB2–FB3–FB4 pins. By routing PCB traces between these pins and VIN–/VOUT, users configure 16 standard gains (e.g., +1, –3, +4, –7) without external components. Resistor matching is factory-trimmed to ±1% tolerance and <10 ppm/°C drift, ensuring stable gain across temperature.

What is the power-down behavior of OPA835IRUNR?

When the PD pin is pulled low (≤0.7 V above VS–), OPA835IRUNR enters power-down mode drawing only 0.5 µA typical quiescent current. Output is disabled (high-impedance), and turn-on delay is 250 ns to 90% of final output value. The PD pin must be actively driven - floating or weak pull-ups will prevent reliable shutdown. This feature enables microsecond-scale wake-up in event-triggered systems.

Can OPA835IRUNR drive ADC inputs directly?

Yes - OPA835IRUNR is explicitly characterized as a low-power SAR and ΔΣ ADC driver. With 55 ns 0.1% settling time, ±40 mA output drive, and rail-to-rail output swing, it interfaces directly with 16-bit+ SAR ADCs (e.g., ADS8860) and audio ADCs (e.g., PCM1865). Its low THD (–130 dBc) and SNR (–116.4 dBc) ensure the op amp does not degrade the ADC's effective number of bits (ENOB) in precision applications.