Texas Instruments OPA4313IPWR

Overview

OPA4313IPWR from Texas Instruments is a quad-channel, rail-to-rail input/output, micro-power CMOS operational amplifier optimized for battery-powered precision signal conditioning. It delivers 1-MHz gain-bandwidth, 50 µA/ch quiescent current, 25 nV/√Hz input voltage noise at 1 kHz, 0.5 mV typical offset voltage, and operates from 1.8 V to 5.5 V - enabling high-accuracy sensor front-ends in portable medical monitors and wireless sensor nodes.

For engineers reviewing the OPA4313IPWR datasheet, OPA4313IPWR pinout, OPA4313IPWR application, or OPA4313IPWR equivalent, key selection criteria include its extended –40°C to +125°C temperature range, internal RF/EMI filtering, unity-gain stability with up to 150 pF capacitive load, and rail-to-rail operation supporting low-voltage ADC driving without headroom loss.

Technical Context

The OPA4313IPWR employs a complementary differential input stage (N- and P-channel pairs) enabling true rail-to-rail common-mode input range - extending 200 mV beyond both supply rails - with no phase reversal during overdrive. Its class AB output stage drives ≥10-kΩ loads while maintaining rail-to-rail swing.

Internal ESD protection (4-kV HBM), integrated low-pass EMI filter (–3 dB at ~35 MHz), and robust unity-gain stability make it suitable for noisy industrial and portable environments where signal integrity and reliability are critical across wide supply and temperature ranges.

Key Specifications

Pinout & Package

TSSOP-14 package (PW designation) with exposed thermal pad on underside; requires connection of thermal pad to V– for optimal thermal performance and stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP6004-E/ST and LMV324IDR, the OPA4313IPWR uniquely combines ultra-low quiescent current, rail-to-rail input *and* output, internal EMI filtering, and full industrial temperature qualification - making it the only option among the three qualified for precision, low-power, noise-immune operation across –40°C to +125°C.

Availability

OPA4313IPWR is available at Aetrix Electronics and suitable for portable medical devices, wireless industrial transmitters, and home security sensor hubs requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for OPA4313IPWR 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 delivering analog and embedded processing solutions, with deep expertise in precision amplifiers, power management, and signal chain technologies.

The OPA313 family - including OPA4313IPWR - was designed for cost-sensitive, battery-powered applications demanding precision, low power, and robustness across wide temperature and supply ranges.

FAQ

What is the maximum capacitive load the OPA4313IPWR can drive while remaining unity-gain stable?

The OPA4313IPWR is unity-gain stable with capacitive loads up to 150 pF, as confirmed in the datasheet's Phase Margin vs Capacitive Load plot (Figure 21). This allows direct connection to ADC input capacitors or long PCB traces without external isolation resistors - simplifying layout in space-constrained portable designs. Exceeding 150 pF may reduce phase margin and cause peaking or oscillation in the OPA4313IPWR output.

Does the OPA4313IPWR support true rail-to-rail input, and what is the practical common-mode range?

Yes, the OPA4313IPWR supports true rail-to-rail input: its common-mode voltage range extends from (V–) – 0.2 V to (V+) + 0.2 V, verified across –40°C to +125°C. This enables direct interfacing with sensors referenced to either supply rail - such as single-supply bridge circuits or current-sense amplifiers - without level-shifting. The OPA4313IPWR achieves this via parallel N- and P-channel input stages.

How does the internal EMI filter in the OPA4313IPWR improve system-level robustness?

The OPA4313IPWR integrates an internal low-pass filter (~35 MHz –3 dB point) on both inputs to attenuate high-frequency electromagnetic interference before rectification occurs in internal junctions. This reduces EMI-induced offset shifts - quantified by EMIRR IN+ (≥80 dB at 100 MHz) - making the OPA4313IPWR significantly more robust than unfiltered op amps in environments with Wi-Fi, Bluetooth, or switching power supply noise.

What is the thermal pad connection requirement for the OPA4313IPWR in TSSOP-14 (PW) package?

The exposed thermal pad on the underside of the OPA4313IPWR's TSSOP-14 package must be soldered and electrically connected to the V– (negative supply) pin. This connection is mandatory for achieving the specified θJA of 121.0°C/W and ensuring stable operation across the full –40°C to +125°C temperature range. Failure to connect the pad risks thermal runaway and parameter drift in the OPA4313IPWR.

Can the OPA4313IPWR operate reliably from a 1.8-V single supply, and how does performance compare to 5.5-V operation?

Yes, the OPA4313IPWR is fully specified from 1.8 V to 5.5 V. At 1.8 V, gain-bandwidth drops to 0.9 MHz (vs 1 MHz at 5.5 V), slew rate decreases to 0.45 V/µs (vs 0.5 V/µs), and output swing degrades slightly (e.g., 25–50 mV from rails at RL = 2 kΩ). However, quiescent current remains 50 µA/ch, and rail-to-rail functionality is preserved - making the OPA4313IPWR uniquely capable of precision operation across the entire voltage range.