Texas Instruments OPA336NA/250

Overview

OPA336NA/250 from Texas Instruments is a single-channel, rail-to-rail output, microPower CMOS operational amplifier designed for ultra-low-power, single-supply battery-operated systems. It delivers 125 µV max input offset voltage, 20 µA quiescent current per amplifier, and rail-to-rail output swing within 3 mV of supply rails under 100 kΩ load - enabling precision signal conditioning in portable medical instruments and photodiode pre-amplifiers.

For engineers reviewing the OPA336NA/250 datasheet, OPA336NA/250 pinout, OPA336NA/250 application, or OPA336NA/250 equivalent, key selection criteria include its 2.3 V to 5.5 V supply range, 1 pA input bias current, 115 dB open-loop gain, and SOT-23-5 package compatibility with space-constrained PCB layouts.

Technical Context

The OPA336NA/250 employs a CMOS input stage with common-mode input range extending to the negative rail (V– – 0.2 V), supporting true single-supply operation down to 2.1 V. Its unity-gain-stable architecture ensures stability with capacitive loads up to 300 pF in unity-gain configuration, and it features no phase inversion when inputs exceed supply rails.

Internal design includes ESD protection rated at 500 V HBM, 100 V MM, and 1000 V CDM (NJ/UJ variants), with thermal resistance θ_JA = 200 °C/W in the SOT-23-5 package. The device operates across –40°C to +85°C and survives –55°C to +125°C, meeting industrial-grade reliability requirements.

Key Specifications

Pinout & Package

OPA336NA/250 is housed in a 5-pin SOT-23-5 surface-mount package (DBV), optimized for compact PCB layouts and automated assembly. Thermal resistance is 200 °C/W (θ_JA), and the package is RoHS-compliant with NiPdAu lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA340UA/2K5 and LTC1540CS5#TRMPBF, the OPA336NA/250 uniquely balances ultra-low quiescent current, rail-to-rail output, and sub-130 µV offset in a 5-pin SOT-23 - making it irreplaceable for battery-powered precision analog front-ends where power budget and DC accuracy are jointly constrained.

Availability

OPA336NA/250 is available at Aetrix Electronics and suitable for portable medical instruments, photodiode pre-amplifiers, and precision integrators requiring stable component supply across multi-year production cycles.

Supply support for OPA336NA/250 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 low-power signal chains.

The OPA336NA/250 belongs to TI's microAmplifier™ series, engineered specifically for ultra-low-power, single-supply applications in portable instrumentation and sensor interfaces where battery life and DC accuracy are paramount.

FAQ

What is the minimum operating supply voltage for the OPA336NA/250?

The OPA336NA/250 operates down to 2.1 V, though it is fully specified from 2.3 V to 5.5 V. At 2.1 V, key parameters such as output swing and open-loop gain remain functional but may deviate slightly from datasheet limits. For guaranteed performance across temperature, designs should target ≥2.3 V supply - consistent with the OPA336NA/250's qualification range of –40°C to +85°C.

Does the OPA336NA/250 support rail-to-rail input common-mode range?

No - the OPA336NA/250 supports rail-to-rail *output*, but its input common-mode range extends from (V–) – 0.2 V to (V+) – 1 V. This means the non-inverting input can accept signals down to the negative rail (enabling true single-supply use), but cannot reach within 1 V of the positive rail. This limitation is inherent to its CMOS input stage and must be accounted for in level-shifting or biasing networks.

Can the OPA336NA/250 drive capacitive loads, and what is the recommended approach?

Yes - the OPA336NA/250 can drive up to ~300 pF in unity-gain configuration without external compensation. For larger loads, TI recommends adding a 50 Ω to 100 Ω resistor inside the feedback loop (between output and inverting input). This maintains DC accuracy while damping ringing. The OPA336NA/250's stability is also improved when the resistive load is tied to ground rather than mid-supply, as shown in Figure 5 of the SBOS068C datasheet.

What is the thermal resistance (θ_JA) of the OPA336NA/250 in its SOT-23-5 package?

The OPA336NA/250 in the SOT-23-5 (DBV) package has a junction-to-ambient thermal resistance (θ_JA) of 200 °C/W, as specified in the SBOS068C datasheet. This value assumes standard JEDEC test conditions (single-layer copper, no thermal vias). Actual board-level θ_JA will improve with added copper area, thermal vias, or airflow - critical for sustained operation near its 150 °C maximum junction temperature.

Is the OPA336NA/250 pin-compatible with other members of the OPA336 family?

Yes - all single-channel OPA336 variants (OPA336N, OPA336NA, OPA336NJ, OPA336U, OPA336UA) share identical pinouts in their respective packages: SOT-23-5 for NA/N/NJ versions and SO-8 for U/UA versions. The OPA336NA/250 uses the SOT-23-5 footprint, so it is mechanically and electrically interchangeable with OPA336N/250 and OPA336NJ/250 on the same PCB layout, provided temperature and ESD requirements align.