Texas Instruments OPA4310SIRTER

Overview

OPA4310SIRTER from Texas Instruments is a quad-channel, rail-to-rail input/output operational amplifier with shutdown control, optimized for low-voltage (1.5V to 5.5V) operation, ±150mA output current capability at 5.5V, 3MHz gain-bandwidth product, and fast 0.9µs enable time from shutdown - used in LED drivers, reference buffers, and 4–20mA loop transmitters.

For engineers reviewing the OPA4310SIRTER datasheet, OPA4310SIRTER pinout, OPA4310SIRTER application, or OPA4310SIRTER equivalent, key selection criteria include its quad-channel shutdown grouping (SHDN12/SHDN34), 16-pin WQFN package with exposed thermal pad, rail-to-rail swing down to 0.75mV from rails at 5.5V/10kΩ, 165µA/ch quiescent current, and robust EMI filtering on all inputs.

Technical Context

The OPA4310SIRTER integrates four independent high-output-current amplifiers sharing two dedicated shutdown pins (SHDN12 for channels 1–2, SHDN34 for channels 3–4), enabling selective power gating without cross-talk. Its internal RFI/EMI filtering eliminates phase reversal during input overdrive and supports stable operation driving up to 250pF capacitive loads.

It features fail-safe input structure with no diodes to V+, allowing input voltages up to 6.0V beyond V–, and delivers ±110mA short-circuit current per channel at 5.5V across –40°C to +125°C - validated by TI's production characterization data and thermal metrics including RθJA = 57.6°C/W (WQFN).

Key Specifications

Pinout & Package

OPA4310SIRTER is packaged in a 3mm × 3mm, 16-pin WQFN (RTE) with exposed thermal pad connected to V– for optimal thermal dissipation. Pin count and layout match TI's standard quad op-amp shutdown footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA4310IDR, OPA4310SIRTER adds dual-group shutdown and superior thermal performance (RθJA = 57.6°C/W vs. 101.5°C/W), while TLV9064IRTER trades output drive and EMI hardening for higher bandwidth - making OPA4310SIRTER optimal for ruggedized, power-gated analog front-ends.

Availability

OPA4310SIRTER is available at Aetrix Electronics and suitable for optical transceivers, industrial 4–20mA transmitters, and precision reference buffering requiring stable component supply, extended temperature support (–40°C to +125°C), and qualified WQFN packaging.

Supply support for OPA4310SIRTER 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 for industrial, automotive, and communications markets.

The OPAx310 family targets high-output-current, low-voltage precision amplification in space- and power-constrained applications - specifically engineered for LED/laser drivers, reference buffers, and current-loop transmitters demanding rail-to-rail operation and fast enable/disable control.

FAQ

What is the maximum capacitive load the OPA4310SIRTER can drive without oscillation?

The OPA4310SIRTER drives up to 250pF of capacitive load with no sustained oscillations under unity-gain conditions (RL = 10kΩ to VS/2). This capability is verified across temperature and supply voltage (1.5V–5.5V) and eliminates the need for external isolation resistors in LCD driver or long-trace applications - a key advantage over general-purpose op-amps that require compensation for loads >100pF. The OPA4310SIRTER maintains phase margin ≥40° even at 75pF.

Does the OPA4310SIRTER support true rail-to-rail input when powered from a 1.8V supply?

Yes, the OPA4310SIRTER supports rail-to-rail input operation at 1.8V supply, with common-mode voltage range specified from (V–) to (V+) across temperature (–40°C to +125°C). At 1.8V, inputs operate from ground to 1.8V with full functionality - confirmed by TI's electrical characteristics table (VCM min/max = V– / V+). This enables direct interfacing with 1.8V logic and low-voltage DACs without level-shifting circuitry.

How does the shutdown functionality work on the OPA4310SIRTER?

The OPA4310SIRTER uses two dedicated shutdown pins: SHDN12 controls channels 1 and 2, while SHDN34 controls channels 3 and 4. Each pin is active-high (logic high = enabled, logic low = disabled), with defined thresholds: VSHDN_IH ≥ (V–) + 1.2V and VSHDN_IL ≤ (V–) + 0.2V. When disabled, output impedance rises to 43GΩ || 11.5pF and quiescent current drops to 0.100–0.150µA per channel - verified in TI's production test data for the RTE package.

What thermal considerations apply to the OPA4310SIRTER in a 16-pin WQFN package?

The OPA4310SIRTER in the RTE (WQFN) package has a junction-to-ambient thermal resistance (RθJA) of 57.6°C/W - significantly lower than SOIC or TSSOP variants - due to its exposed thermal pad, which must be soldered to a V– plane for effective heat transfer. Its junction-to-board (RθJB) is 32.9°C/W, confirming strong thermal coupling to PCB copper. Designers must route thermal vias under the pad and avoid floating it, as thermal performance degrades >3× if the pad is unconnected.

Is the OPA4310SIRTER suitable for driving LED strings in constant-current mode?

Yes, the OPA4310SIRTER is explicitly designed for LED driver applications, delivering ±150mA typical output current at 5.5V and ±110mA minimum across –40°C to +125°C. Its rail-to-rail output swing (within 0.75mV of rails at 5.5V/10kΩ) maximizes compliance voltage for series-connected LEDs, and internal current-limit and thermal shutdown protections prevent damage during fault conditions - as documented in TI's device description and absolute maximum ratings.