Texas Instruments OPA836IRUNT

Overview

OPA836IRUNT from Texas Instruments is a single-channel, ultra-low-power, rail-to-rail output, negative-rail input voltage-feedback operational amplifier. It delivers 205 MHz bandwidth, 560 V/µs slew rate, and 1 mA quiescent current at 5 V supply, operating from –40°C to +125°C. It is designed for high-frequency signal conditioning in portable, battery-powered systems requiring minimal power and compact layout.

For engineers reviewing the OPA836IRUNT datasheet, OPA836IRUNT pinout, OPA836IRUNT application, or OPA836IRUNT equivalent, this page provides verified technical context, validated pin functions, confirmed gain-resistor integration, real-world application mappings, and two rigorously cross-checked alternative op-amps with documented functional and application-level differences.

Technical Context

The OPA836IRUNT implements a voltage-feedback architecture optimized for unity-gain stability across 2.5 V–5.5 V supplies, with –0.2 V to +3.9 V input voltage range (at 5 V) and rail-to-rail output swing. Its integrated 10-pin WQFN package includes four internal thin-film resistors (FB1–FB4) enabling 16 discrete gain configurations via external PCB traces - including non-inverting gains up to +8 and inverting attenuations down to –0.1429.

It features dual-mode operation: normal mode (PD ≥ VS– + 2.1 V) draws 1 mA typical, while power-down mode (PD ≤ VS– + 0.7 V) reduces quiescent current to 0.5 µA typical. Overdrive recovery time is 60 ns, and settling to 0.1% occurs in 22 ns for a 2-V step - confirming suitability for fast SAR ADC driving and audio front-end buffering.

Key Specifications

Pinout & Package

The OPA836IRUNT is housed in a 10-pin WQFN package (2.00 mm × 2.00 mm, 0.4 mm pitch) with wettable flanks, optimized for space-constrained portable designs. Its pinout integrates four feedback resistor terminals (FB1–FB4) alongside standard op-amp signals and a dedicated power-down control.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed, low-power operational amplifier applications.

Compared with OPA835IRUNT and LMH6619MMX/NOPB, the OPA836IRUNT uniquely combines 205 MHz bandwidth, 1 mA IQ, integrated gain resistors, and negative-rail input - making it the only option among the three qualified for high-sample-rate, space-constrained, battery-operated signal chains requiring both speed and precision.

Availability

OPA836IRUNT is available at Aetrix Electronics and suitable for portable medical devices, automotive cabin microphones, industrial wireless sensors, and high-density test equipment requiring stable component supply and long-term production continuity.

Supply support for OPA836IRUNT 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 automotive-grade process validation.

The OPAx836 product line was engineered specifically for battery-powered, high-bandwidth signal acquisition - delivering industry-leading speed-per-milliamp performance in miniature WQFN packages with integrated passive elements to shrink system footprint.

FAQ

What is the package type and footprint size of the OPA836IRUNT?

The OPA836IRUNT uses a 10-pin WQFN package with nominal dimensions of 2.00 mm × 2.00 mm and 0.4 mm pitch. It features wettable flanks for automated optical inspection and is distinct from the 6-pin SOT-23 variant (OPA836IDBVR). This compact footprint supports high-density PCB layouts in portable and wearable electronics where board space is constrained. The OPA836IRUNT's package integrates four internal gain-setting resistors, eliminating the need for external feedback networks in many configurations.

Does the OPA836IRUNT support true single-supply operation with rail-to-rail input?

The OPA836IRUNT supports true single-supply operation with rail-to-rail *output*, but its input stage is negative-rail input (not rail-to-rail input). The specified input common-mode range extends from –0.2 V to +3.9 V at 5 V supply - meaning it accepts signals slightly below ground (VS−), but not up to VS+. This architecture enables direct interfacing with transducers and sensors that reference below ground, while maintaining low input bias current and high CMRR. For full rail-to-rail input, consider alternatives like the OPA365 series - but those lack the OPA836IRUNT's 205 MHz bandwidth and integrated gain resistors.

How does the power-down feature of the OPA836IRUNT function, and what is its latency?

The OPA836IRUNT's power-down (PD) pin is an active-low digital control input. When PD is pulled ≤ 0.7 V above VS−, the amplifier enters low-power mode with 0.5 µA typical quiescent current. When PD rises ≥ 2.1 V above VS−, normal operation resumes. Turn-on delay is 200 ns (time from PD high to VOUT reaching 90% of final value); turn-off delay is 25 ns. The PD pin must be actively driven - leaving it floating may cause undefined behavior. This fast, deterministic switching supports burst-mode signal acquisition in energy-constrained systems.

What gain configurations are supported by the integrated resistors in the OPA836IRUNT?

The OPA836IRUNT integrates four thin-film resistors (FB1–FB4) forming a 1600 Ω / 1200 Ω / 400 Ω ladder network. By routing PCB traces between these terminals and VIN−/VIN+/VOUT, it supports 16 discrete configurations: non-inverting gains of +1, +2, +2.33, +4, +5, +6.33, +8; inverting gains of –1, –1.33, –3, –4, –5.33, –7; and inverting attenuations of –0.1429, –0.1875, –0.25, –0.33, –0.75. These values are explicitly listed in TI's OPA836 datasheet Table 9-1 and Table 9-2, and all are achievable without external components - reducing bill-of-materials and layout complexity.

Is the OPA836IRUNT suitable for driving ADC inputs, and which ADC types does it target?

Yes, the OPA836IRUNT is explicitly characterized and recommended for driving SAR and ΔΣ ADC inputs in low-power systems. Its 22 ns 0.1% settling time meets timing requirements for 16-bit SAR ADCs sampling at ≥1 MSPS; its 4.6 nV/√Hz input noise preserves dynamic range for 16–18-bit converters; and its 50 mA output drive handles typical ADC input capacitance and series resistance. It is especially effective for portable and battery-powered ADC applications - such as portable ECG monitors, handheld test equipment, and IoT sensor nodes - where minimizing power, size, and external component count is critical. The OPA836IRUNT is not intended for high-resolution pipeline or flash ADCs requiring >500 MHz bandwidth.