Texas Instruments OPA2835IRMCT

Overview

OPA2835IRMCT from Texas Instruments is a dual ultra-low-power, rail-to-rail output, negative-rail input voltage-feedback operational amplifier in a 10-pin VSSOP package. It delivers 56 MHz bandwidth, 160 V/µs slew rate, and 250 µA/ch quiescent current at 5 V supply, enabling high-fidelity signal conditioning in battery-powered portable systems such as ultrasonic flow meters and low-power SAR ADC drivers.

For engineers reviewing the OPA2835IRMCT datasheet, OPA2835IRMCT pinout, OPA2835IRMCT application, or OPA2835IRMCT equivalent, key selection criteria include its –40°C to +125°C operating range, 0.5 µA power-down current, 9.3 nV/√Hz input voltage noise, and dual-channel crosstalk of –120 dB - all critical for precision, low-power, high-density analog front-ends.

Technical Context

The OPA2835IRMCT implements a voltage-feedback architecture with independent power-down control per channel (PD1/PD2), supporting rapid enable/disable transitions (50 ns turnoff, 250 ns turnon). Its negative-rail input stage allows operation down to –0.2 V with 5-V supply, while rail-to-rail output delivers >40 mA drive into 2-kΩ loads.

Designed for single-supply operation from 2.5 V to 5.5 V, it maintains 113 dB CMRR and ±500 µV max input offset voltage across –40°C to +125°C. Harmonic distortion remains below –70 dBc at 1 MHz, supporting high-SNR audio and measurement applications without external compensation.

Key Specifications

Pinout & Package

OPA2835IRMCT is housed in a 10-pin Very Small Outline Package (VSSOP) with 3.00 mm × 3.00 mm body size and 0.5-mm lead pitch. The package supports automated optical inspection and fine-pitch PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2835IRMCT, OPA2836IDGSR trades 4× higher power for >3× bandwidth, while OPA2365AIDR sacrifices speed and output drive for lower noise and true rail-to-rail input - making OPA2835IRMCT the optimal balance of speed, power, and negative-rail input capability in compact VSSOP form.

Availability

OPA2835IRMCT is available at Aetrix Electronics and suitable for ultrasonic flow meters, portable medical devices, and low-power data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA2835IRMCT 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 high-performance operational amplifiers and precision signal-chain solutions.

The OPAx835 family was designed specifically for battery-powered, high-speed analog signal conditioning - delivering industry-leading bandwidth-per-microwatt efficiency for portable instrumentation, industrial sensing, and medical diagnostics.

FAQ

What is the maximum supply voltage for OPA2835IRMCT?

The OPA2835IRMCT supports a maximum supply voltage of 5.5 V across VS+ to VS–. Absolute maximum ratings specify that the difference between VS+ and VS– must not exceed 5.5 V, and input voltages must remain within VS– – 0.7 V to VS+ + 0.7 V. Operation beyond these limits risks permanent damage. The device is optimized for 2.5 V to 5.5 V single-supply or ±1.25 V to ±2.75 V dual-supply configurations, with full specifications guaranteed across this range.

Does OPA2835IRMCT support rail-to-rail input?

No, OPA2835IRMCT does not support rail-to-rail input. It features a negative-rail input stage, allowing the input common-mode range to extend down to –0.2 V (with 5-V supply), but the upper limit is 3.9 V - not the positive rail. This architecture enables robust operation near ground in single-supply systems while maintaining high CMRR (113 dB) and low input bias current. For true rail-to-rail input, alternatives like OPA2365AIDR should be considered.

How does the power-down function work on OPA2835IRMCT?

The OPA2835IRMCT provides independent power-down control via PD1 and PD2 pins. Each pin is active-low: driving PD1 or PD2 to VS– (or logic low) places the corresponding amplifier channel into ultra-low-power mode with typical quiescent current of 0.5 µA. Both pins must be driven - floating is undefined. Turnoff delay is 50 ns; turnon delay is 250 ns. This enables precise, per-channel power gating in multi-stage analog signal chains without affecting the other channel's operation.

What is the thermal resistance (RθJA) of OPA2835IRMCT in its VSSOP package?

The junction-to-ambient thermal resistance (RθJA) for OPA2835IRMCT in the DGS (VSSOP-10) package is 206°C/W, as specified in the official TI datasheet (SLOS713J, Section 7.5). This value assumes standard JEDEC high-K board conditions (2S2P). Actual thermal performance depends on PCB layout - adding copper pour and thermal vias beneath the exposed pad (if present) can significantly reduce effective RθJA. The device's 125°C max operating temperature and 150°C max junction temperature require careful thermal design in high-ambient or high-power-density applications.

Can OPA2835IRMCT drive a 2-kΩ load with rail-to-rail output swing?

Yes, OPA2835IRMCT delivers rail-to-rail output swing into a 2-kΩ load. At 5-V supply and G = 5, the output voltage low is specified at 0.15 V (typ) and high at 2.45 V (typ), achieving >95% of full rail span. It sources/sinks ±40 mA (min) under these conditions, ensuring minimal droop even at full-scale output. This capability eliminates the need for external level-shifting circuitry when interfacing with 12-bit+ ADCs or comparators referenced to the same supply rails.