STMicroelectronics OA4MPA33Q

Overview

OA4MPA33Q from STMicroelectronics is a quad-channel, rail-to-rail input/output, low-power CMOS operational amplifier optimized for precision analog signal conditioning in ultra-low-power wearable and medical sensor interfaces. It delivers 200 µV max input offset voltage, 10 µA per channel supply current at 5 V, 150 kHz gain bandwidth product, 1 pA typical input bias current, and operates across 1.5 V to 5.5 V supply with -40 °C to +125 °C extended temperature range.

For engineers reviewing the OA4MPA33Q datasheet, OA4MPA33Q pinout, OA4MPA33Q application, or OA4MPA33Q equivalent, this device is selected for battery-powered precision front-ends requiring minimal quiescent power, high DC accuracy without calibration, EMI-hardened performance, and guaranteed operation down to 1.5 V in compact QFN16 3x3 packaging.

Technical Context

The OA4MPA33Q implements a proprietary trimming topology activated at each power-up to achieve stable 200 µV max input offset without external calibration. Its rail-to-rail input stage extends common-mode range to VCC− − 0.1 V and VCC+ + 0.1 V, while rail-to-rail output drives within 40 mV of VCC+ and 75 mV of VCC− under 10 kΩ load.

It features EMI-hardened architecture with 38–63 dB EMI rejection ratio (400–2400 MHz), 4 kV HBM ESD rating, and long-term input offset drift of only 0.7 µV/month (typical). The device uses ST's 5 V CMOS process to balance speed (150 kHz GBP) and ultra-low power (10 µA/channel @ 5 V).

Key Specifications

Pinout & Package

OA4MPA33Q is housed in a 3 mm × 3 mm, 16-pin QFN package with exposed thermal pad. The package supports efficient heat dissipation (R_thJA = 45 °C/W) and provides robust mechanical mounting for high-vibration applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV9004IDR and OPA2333PWR, OA4MPA33Q uniquely balances sub-15 µA power, 200 µV V_io, EMI hardening, and QFN16 footprint-making it optimal for space-constrained, battery-operated medical sensors where RF immunity and multi-year shelf-life stability are critical.

Availability

OA4MPA33Q is available at Aetrix Electronics and suitable for wearable health monitors, fitness trackers, and clinical-grade point-of-care diagnostics requiring stable component supply, long-lifecycle support, and traceable sourcing for FDA-regulated BOMs.

Supply support for OA4MPA33Q 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, power management, and MEMS sensors for industrial, automotive, and consumer markets.

The OA4MPA series belongs to ST's high-precision, ultra-low-power op amp product line, engineered specifically for energy-constrained biomedical sensing and portable instrumentation where DC accuracy, EMI resilience, and extended temperature operation are non-negotiable.

FAQ

What is the initialization time behavior of OA4MPA33Q after power-up?

OA4MPA33Q performs internal trimming at every power-on event, requiring an initialization delay before achieving full specification compliance. At 25 °C and 5 V supply, this delay is 5 ms; it extends to 50 ms at 125 °C and 2.4 ms at -40 °C. During initialization, supply current rises transiently to ~0.4 mA per channel before settling to 10 µA. This behavior is guaranteed by design and documented in Section 4.6 of the datasheet.

Can the exposed thermal pad of the QFN16 package be left floating?

No - the exposed pad (Pin 17) must be soldered to a PCB copper pour connected to VCC− (ground) for optimal thermal performance, EMI suppression, and electrical stability. Leaving it floating degrades R_thJA by ~30 °C/W and reduces EMI rejection by up to 10 dB. ST recommends a minimum 2×2 mm thermal pad with ≥4 thermal vias to inner ground planes per the layout guidelines in Section 4.7.

How does OA4MPA33Q perform in single-supply 1.8 V operation?

OA4MPA33Q is fully specified down to 1.5 V and operates reliably at 1.8 V. At this voltage, gain bandwidth drops to 100 kHz (min), supply current is 9 µA (typ), and input offset remains ≤200 µV (max at 25 °C). Rail-to-rail I/O functionality is preserved, with output swing limited to within 55 mV of each rail under 10 kΩ load - making it ideal for single-cell alkaline or NiMH-powered devices.

Is OA4MPA33Q qualified for medical device applications per ISO 13485 or IEC 60601?

OA4MPA33Q is not individually certified to ISO 13485 or IEC 60601, but it is manufactured in ST's ISO 13485-certified facilities and meets key requirements for medical use: extended -40 °C to +125 °C temperature range, 4 kV HBM ESD, AEC-Q200 stress test alignment, and long-term V_io stability (0.7 µV/month). Final medical qualification rests with the end-system manufacturer's risk management and validation process.