Texas Instruments OPA4348AIDR

Overview

OPA4348AIDR from Texas Instruments is a quad, rail-to-rail input/output CMOS operational amplifier optimized for low-power, single-supply operation across 2.1 V to 5.5 V. It delivers 1 MHz gain-bandwidth, 45 µA per amplifier quiescent current, 0.5 pA input bias current, and rail-to-rail output swing within 18 mV of supply rails under light loads - enabling precision signal conditioning in battery-powered smoke alarms and CO detectors.

For engineers reviewing the OPA4348AIDR datasheet, OPA4348AIDR pinout, OPA4348AIDR application, or OPA4348AIDR equivalent, key selection criteria include its guaranteed –40°C to +125°C operation, 14-pin TSSOP package footprint, 78°C/W junction-to-ambient thermal resistance, and compatibility with high-impedance sensor interfaces requiring sub-picoampere bias current and extended common-mode range.

Technical Context

The OPA4348AIDR employs a complementary N-channel/P-channel input stage enabling rail-to-rail input operation from (V–) – 0.2 V to (V+) + 0.2 V - including 200 mV beyond both supply rails. Its class AB output stage supports rail-to-rail output swing, delivering ±10 mA short-circuit current while maintaining >90 dB open-loop gain at 5 kΩ load.

Designed for unity-gain stability, it drives up to 250 pF capacitive loads directly; phase margin is preserved via internal compensation. The device operates across full industrial temperature range without performance derating, with offset voltage drift limited to 4 µV/°C and PSRR of 175 µV/V at 25°C.

Key Specifications

Pinout & Package

OPA4348AIDR is packaged in a 14-pin TSSOP (PW package), body size 5.00 mm × 4.40 mm, with exposed pad for thermal enhancement. Pinout follows standard quad op amp configuration with independent input/output per channel and shared dual supply pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA4348AIDR, OPA4348AIPW provides identical performance in a larger, more manufacturable package, while MCP6004-E/ST trades off temperature range and power efficiency for broader supply flexibility - making OPA4348AIDR the sole choice for safety-certified, battery-operated, high-reliability applications.

Availability

OPA4348AIDR is available at Aetrix Electronics and suitable for smoke detector manufacturing, CO sensor module integration, and medical wearable analog front-ends requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for OPA4348AIDR 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 company headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with over 90 years of innovation in precision amplifiers and power management ICs.

The OPAx348 product line was engineered specifically for ultra-low-power, single-supply sensor signal conditioning in safety-critical portable equipment - emphasizing picoampere input bias, rail-to-rail operation, and extended temperature reliability.

FAQ

What is the maximum capacitive load the OPA4348AIDR can drive in unity-gain configuration?

The OPA4348AIDR can directly drive up to 250 pF of pure capacitive load while maintaining stability and specified phase margin. For loads exceeding this value, a small series resistor (10 Ω to 20 Ω) between the output and capacitive node restores stability without degrading DC accuracy - a technique validated in TI's SBOS213H datasheet Figure 22. This capability makes OPA4348AIDR suitable for driving ADC input capacitance and long PCB traces in compact sensor modules.

Does the OPA4348AIDR support operation below 2.5 V supply voltage?

Yes, the OPA4348AIDR is fully specified and tested from 2.5 V to 5.5 V, but its functional operating range extends down to 2.1 V - confirmed in Section 6.3 "Recommended Operating Conditions" of the SBOS213H datasheet. At 2.1 V, parameters such as gain-bandwidth and output swing remain usable for low-voltage battery applications, though some specifications (e.g., open-loop gain) are characterized at higher voltages. The OPA4348AIDR maintains rail-to-rail input/output behavior across the entire 2.1 V–5.5 V range.

What is the thermal resistance (RθJA) of the OPA4348AIDR in its TSSOP package?

The junction-to-ambient thermal resistance (RθJA) of the OPA4348AIDR in the PW (TSSOP-14) package is 121°C/W, as documented in Section 6.6 "Thermal Information: OPA4348" of the SBOS213H datasheet. This value assumes standard JEDEC 2-layer board conditions. With proper PCB copper pour and thermal vias under the exposed pad, actual thermal performance improves significantly - enabling reliable operation at full 125°C ambient when dissipating up to 12 mW per amplifier (48 mW total).

Can the OPA4348AIDR be used in a transimpedance amplifier configuration for photodiode sensing?

Yes, the OPA4348AIDR is well-suited for transimpedance amplifier (TIA) applications due to its 0.5 pA typical input bias current, rail-to-rail input range, and 1 MHz bandwidth - all critical for preserving signal fidelity in photodiode and electrochemical sensor interfaces. Its low input current minimizes dark-current error, while the extended common-mode range accommodates reverse-biased diode configurations. Layout best practices (guard ring, low-capacitance feedback path) are required to maintain stability, as outlined in Section 8.1.1 of the SBOS213H datasheet.

Is the OPA4348AIDR pin-compatible with other members of the OPAx348 family?

No, the OPA4348AIDR is not pin-compatible with OPA348 (5- or 8-pin) or OPA2348 (8-pin) variants due to differing channel counts and package footprints. However, it shares identical electrical specifications and functional behavior per channel with those devices - enabling design reuse at the schematic level when migrating from single/dual to quad implementations. The 14-pin TSSOP pinout is unique to the OPA4348 series and defined explicitly in Section 5 "Pin Configuration and Functions" of SBOS213H.