Texas Instruments OPA336N/3K

Overview

OPA336N/3K from Texas Instruments is a single-channel, rail-to-rail output, microPower CMOS operational amplifier designed for ultra-low-power, single-supply battery-powered 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 OPA336N/3K datasheet, OPA336N/3K pinout, OPA336N/3K application, or OPA336N/3K 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, unity-gain stability, and SOT-23-5 package compatibility with space-constrained PCB layouts.

Technical Context

The OPA336N/3K 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 rail-to-rail output stage uses complementary PMOS/NMOS drivers to achieve 3 mV swing margin at 100 kΩ load while maintaining >70 dB AOL.

Internally compensated for unity-gain stability, it features 100 kHz gain-bandwidth product and 0.03 V/µs slew rate - optimized for low-frequency precision applications like integrators and sensor front-ends where power efficiency and DC accuracy outweigh speed requirements.

Key Specifications

Pinout & Package

OPA336N/3K is packaged in a 5-pin SOT-23 surface-mount package (DBV drawing), with thermal resistance θ_JA = 200°C/W. The compact 2.9 mm × 1.6 mm footprint supports high-density portable PCB designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA336N/3K, OPA340UA trades 100× higher power for 55× greater bandwidth, while MCP6001T-I/OT offers lower minimum supply voltage at the expense of 60% higher offset voltage and reduced open-loop gain - making OPA336N/3K optimal for precision, battery-limited, 2.3–5.5 V applications.

Availability

OPA336N/3K is available at Aetrix Electronics and suitable for battery-powered medical sensors, photodiode pre-amplifiers, precision integrators, portable test equipment, and low-power industrial monitoring systems requiring stable component supply across extended production lifecycles.

Supply support for OPA336N/3K 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 amp design and manufacturing.

The OPA336N/3K belongs to TI's microAmplifier™ series, engineered specifically for ultra-low-power, single-supply signal conditioning in portable and battery-operated instrumentation where DC accuracy, rail-to-rail performance, and minimal quiescent current are critical.

FAQ

What is the minimum operating voltage for the OPA336N/3K?

The OPA336N/3K 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 including open-loop gain, output swing, and offset voltage remain functional but may deviate from datasheet limits - design validation at 2.1 V is recommended for mission-critical applications. The OPA336N/3K maintains rail-to-rail output capability even at this minimum supply.

Is the OPA336N/3K pin-compatible with other variants in the OPA336 family?

Yes - the OPA336N/3K in SOT-23-5 shares identical pinout with all single-channel OPA336 variants (e.g., OPA336NA, OPA336NJ). However, it is not pin-compatible with dual (OPA2336) or quad (OPA4336) versions, which use 8-pin and 16-pin packages respectively. Always verify package drawing DBV and pin 1 orientation (Q3 quadrant) before PCB layout.

Does the OPA336N/3K require external compensation for stability?

No - the OPA336N/3K is internally compensated and unity-gain stable. It drives capacitive loads up to 300 pF in unity-gain configuration without oscillation. For loads >300 pF, a 50–100 Ω series resistor inside the feedback loop (as shown in TI's Figure 3) restores phase margin. This behavior is confirmed in the OPA336N/3K datasheet's Capacitive Load and Stability section.

What is the maximum capacitive load the OPA336N/3K can drive reliably?

The OPA336N/3K reliably drives up to 300 pF in unity-gain configuration with no external components. With a 100 Ω series resistor in the feedback path, it sustains stability with ≥1000 pF loads under RL = 25 kΩ conditions. Driving >10,000 pF is possible only in higher-gain configurations (G ≥ 10), per TI's application guidance. These values apply directly to the OPA336N/3K in SOT-23-5.

How does the OPA336N/3K handle input voltages beyond the supply rails?

The OPA336N/3K input stage tolerates voltages up to ±0.3 V beyond V+ and V– without damage, and exhibits no phase inversion - unlike many older op amps. Inputs exceeding the common-mode range (V– – 0.2 V to V+ – 1 V) are safe if current-limited to ≤10 mA via series resistors. This robustness is explicitly validated for the OPA336N/3K in its Absolute Maximum Ratings table.