STMicroelectronics OA2MPA22Q

Overview

OA2MPA22Q from STMicroelectronics is a dual-channel, rail-to-rail input/output, high-precision CMOS operational amplifier optimized for ultra-low-power, low-voltage sensor signal conditioning. It delivers 200 µV max input offset voltage, 10 µA supply current per channel at 5 V, 150 kHz gain bandwidth product, and operates across 1.5–5.5 V supply with –40 °C to +125 °C extended temperature range - enabling use in wearable ECG front-ends and portable medical sensors.

For engineers reviewing the OA2MPA22Q datasheet, OA2MPA22Q pinout, OA2MPA22Q application, or OA2MPA22Q equivalent, key selection criteria include its guaranteed 200 µV V_io max at 25 °C, 1 pA typical input bias current, EMI-hardened architecture (EMIRR up to 63 dB at 2.4 GHz), and DFN8 2×2 mm package suitability for space-constrained healthcare PCBs.

Technical Context

This dual op amp employs ST's proprietary CMOS trimming topology that initiates at power-up to achieve stable 200 µV max V_io without external calibration. Its rail-to-rail input stage extends common-mode range to V_CC–0.1 V to V_CC+0.1 V, while rail-to-rail output drives within 40 mV of V_CC and 75 mV of ground under 10 kΩ load.

The device integrates EMI hardening to suppress RF interference up to 2.4 GHz (63 dB EMIRR), features 4 kV HBM ESD tolerance, and maintains 150 kHz GBP and 0.06 V/µs slew rate across 1.5–5.5 V supply - all while consuming only 10–14 µA per channel at 25 °C.

Key Specifications

Pinout & Package

OA2MPA22Q is housed in a thermally enhanced DFN8 2×2 mm package with exposed thermal pad (pin 8). The package supports high-density layout and efficient heat dissipation in compact wearable modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP6V82-E/SN and TLV9062IDR, OA2MPA22Q uniquely balances sub-200 µV offset, 10 µA power, EMI resilience, and –40 °C to +125 °C operation - making it the only dual op amp qualified for FDA-cleared, long-duration wearable diagnostics.

Availability

OA2MPA22Q is available at Aetrix Electronics and suitable for wearable health monitors, portable medical sensors, and fitness tracker signal chains requiring stable component supply across automotive-grade temperature ranges and multi-year production cycles.

Supply support for OA2MPA22Q 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, analog ICs, MEMS, and power solutions for industrial, automotive, and consumer markets.

OA2MPA22Q belongs to the OAxMPA high-precision, low-power op amp family - engineered specifically for energy-constrained, high-accuracy biomedical signal acquisition in wearable and point-of-care devices.

FAQ

What is the maximum recommended PCB trace length between the OA2MPA22Q power pins and its 10 nF decoupling capacitor?

STMicroelectronics specifies a maximum trace length of 2 mm between V_CC and GND pins and the 10 nF ceramic decoupling capacitor. Longer traces increase inductance, degrading high-frequency PSRR and risking instability above 100 kHz - particularly critical given the device's 150 kHz GBP and EMI-hardened design.

Does the OA2MPA22Q require external offset nulling circuitry in ECG applications?

No. OA2MPA22Q incorporates internal power-on trimming that guarantees ≤200 µV input offset voltage at 25 °C without external components. This eliminates manual potentiometer adjustment or digital calibration routines, reducing BOM count and firmware complexity in certified medical wearables.

Can the exposed thermal pad (Pin 8) be left floating or must it be grounded?

The exposed thermal pad must be soldered to the PCB ground plane. STMicroelectronics data confirms it is internally connected to V_CC– (GND). Leaving it unconnected degrades thermal resistance (R_thJA increases from 120 °C/W to >200 °C/W), raises junction temperature, and compromises EMI immunity and long-term V_io stability.

How does the initialization time affect system startup in battery-powered devices?

OA2MPA22Q exhibits a 5 ms initialization period after power-up during which supply current rises transiently (up to 0.46 mA) and V_io is uncalibrated. For ultra-low-power wake-on-event architectures, this requires synchronizing ADC sampling or sensor activation ≥5 ms post-V_CC stabilization to ensure measurement validity.