Texas Instruments OPA2347YZDR

Overview

OPA2347YZDR from Texas Instruments is a dual, microPower, rail-to-rail input/output operational amplifier in lead-free WCSP-8 packaging. It delivers 350kHz bandwidth, 20µA per-channel quiescent current, and operates from 2.3V to 5.5V single supply - enabling ultra-low-power signal conditioning in space-constrained battery-powered smoke detectors and 2-wire transmitters.

For engineers reviewing the OPA2347YZDR datasheet, OPA2347YZDR pinout, OPA2347YZDR application, or OPA2347YZDR equivalent, key selection criteria include its verified 5mV rail-to-rail output swing at light loads, ±10pA input bias current over temperature, WCSP-8 thermal resistance (250°C/W), and photosensitivity-aware design requirements for ambient-light-exposed PCB layouts.

Technical Context

The OPA2347YZDR uses a complementary differential input stage enabling rail-to-rail common-mode input range from (V–) – 0.2V to (V+) + 0.2V, with a 400mV transition region where both N- and P-channel pairs are active. Its class AB output stage achieves rail-to-rail output swing within 5mV of rails under 100kΩ load while maintaining >100dB open-loop gain.

It is unity-gain stable and optimized for driving ADC inputs like the ADS7822, supporting capacitive load drive up to 250pF in unity-gain buffer configuration. Input voltage noise is 60nV/√Hz at 1kHz, and it features 128dB channel separation at 1kHz - critical for dual-channel precision sensing without crosstalk.

Key Specifications

Pinout & Package

OPA2347YZDR is packaged in an 8-ball, lead-free wafer-level chip-scale package (WCSP-8, package drawing YZD), measuring 1.008mm × 2.100mm. The package uses bump-on-pad interconnects with no molding compound or wire bonds, requiring NSMD-defined solder pads and controlled reflow per JEDEC Level-1 MSL.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual microPower op-amp applications.

Compared with OPA2347EA and OPA2347UA, the OPA2347YZDR offers the smallest footprint and lead-free compliance but requires stricter assembly controls and light shielding - making it optimal for high-volume, space-constrained, RoHS-compliant portable safety devices.

Availability

OPA2347YZDR is available at Aetrix Electronics and suitable for smoke detectors, 2-wire transmitters, and portable medical monitors requiring stable component supply with guaranteed long-term manufacturability and RoHS compliance.

Supply support for OPA2347YZDR 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 OPA347 family - including OPA2347YZDR - was designed specifically for ultra-low-power, space-constrained sensing applications such as battery-operated safety and industrial monitoring systems where microPower operation and rail-to-rail performance are mandatory.

FAQ

What is the maximum operating temperature for the OPA2347YZDR?

The OPA2347YZDR is specified for continuous operation from –55°C to +125°C, with absolute maximum junction temperature rated at 150°C. Its WCSP-8 package has a thermal resistance (θJA) of 250°C/W, so power dissipation must be limited to maintain safe junction temperatures in enclosed or high-ambient environments. Derating curves in the SBOS167D datasheet confirm reliable operation across this full industrial range for the OPA2347YZDR.

Does the OPA2347YZDR require input protection against overvoltage?

Yes - the OPA2347YZDR input terminals are diode-clamped to the supply rails, with absolute maximum input voltage of (V–) – 0.5V to (V+) + 0.5V. Inputs exceeding this range must be current-limited to ≤10mA using series resistors, as shown in Figure 5 of the SBOS167D datasheet. This is especially critical for the OPA2347YZDR due to its photosensitive WCSP die, where overvoltage can exacerbate light-induced bias current shifts.

Can the OPA2347YZDR drive a 1000pF capacitive load?

No - the OPA2347YZDR is characterized to drive up to 250pF in unity-gain buffer configuration without instability. Driving 1000pF requires external compensation: add a 10Ω–20Ω series resistor at the output (Figure 6) or use a 4–6pF feedback capacitor in inverter configurations (Figure 7). These techniques preserve DC accuracy while suppressing overshoot, as validated in the Small-Signal Overshoot vs Load Capacitance curves for the OPA2347YZDR.

How does photosensitivity affect the OPA2347YZDR in real-world layouts?

Ambient light exposure increases input bias current in the OPA2347YZDR - tests show typical shifts up to 100pA under fluorescent lighting, potentially degrading offset voltage in high-impedance sensor circuits. The device marking "A9" and WCSP construction confirm its photosensitive nature. Mitigation requires mechanical shielding (e.g., opaque conformal coat or metal can) over the OPA2347YZDR die area, particularly in handheld or surface-mounted smoke/CO detector PCBs.

Is the OPA2347YZDR pin-compatible with other OPA2347 variants?

Yes - the OPA2347YZDR shares identical pinout (V+, Out B, –In B, +In B, Out A, –In A, +In A, V–) and electrical functionality with OPA2347EA (SOT23-8) and OPA2347UA (SOIC-8), as confirmed in Figures 10 and 11 of SBOS167D. However, the WCSP-8 footprint and soldering requirements differ significantly; PCB redesign is required despite functional equivalence. The OPA2347YZDR remains a drop-in electrical replacement when layout accommodates its 1.008mm × 2.100mm land pattern.