Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

STMicroelectronics OA2MPA34S

Name: OA2MPA34S
Brand: STMicroelectronics
SKU: OA2MPA34S
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: OA2MPA34S

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: OA2MPA34S.pdf

Description:: IC CMOS 2 CIRCUIT 8MINISO

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:4,812

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

OA2MPA34S 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 in wearable and medical applications. It delivers 200 µV max input offset voltage, 10 µA supply current per channel at 5 V, 1.5–5.5 V supply range, and 150 kHz gain bandwidth product - enabling accurate DC-coupled amplification in battery-powered health monitors.

For engineers reviewing the OA2MPA34S datasheet, OA2MPA34S pinout, OA2MPA34S application, or OA2MPA34S equivalent, key selection criteria include guaranteed -40 °C to +125 °C operation, 1 pA typical input bias current, EMI-hardened architecture (400–2400 MHz EMIRR up to 63 dB), and MiniSO-8 package compatibility with space-constrained PCB layouts.

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 internal differential voltage limiting (±0.5 V clamp) for robustness and features EMI hardening validated at 400/900/1800/2400 MHz. Its 10 µA/channel quiescent current and 150 kHz GBP are co-optimized for precision analog front-ends where power budget and DC accuracy are critical.

Key Specifications

Parameter	Value and Actual Design Meaning
Input offset voltage	200 µV max at 25 °C - enables sub-mV DC error in sensor amplification without trimming
Supply current per channel	10 µA at 5 V - supports >1-year battery life in coin-cell-powered wearables
Supply voltage range	1.5 V to 5.5 V - operates directly from single Li-ion, alkaline, or regulated 3.3 V rails
Gain bandwidth product	150 kHz typ. - sufficient for ECG, pulse oximetry, and bio-potential signal bandwidths
Input bias current	1 pA typ. - minimizes voltage error across high-impedance pH or electrode sensors
EMI rejection ratio	63 dB at 2400 MHz - suppresses RF interference from Bluetooth/Wi-Fi in compact assemblies
Operating temperature	-40 °C to +125 °C - qualified for body-worn and industrial-grade medical enclosures

Pinout & Package

The OA2MPA34S is housed in an 8-pin MiniSO-8 package (3.9 mm × 4.9 mm, 1.75 mm height), optimized for thermal performance (R_thJA = 190 °C/W) and board-level reliability in high-density medical PCBs.

Pin/Terminal	Circuit Role	Design Meaning
1	Inverting input (Channel A)	Accepts differential signal reference or feedback path for Channel A
2	Non-inverting input (Channel A)	Connects to sensor output or reference voltage for Channel A
3	Output (Channel A)	Drives downstream ADC or filter with rail-to-rail swing (≤40 mV from rails)
4	V_CC- (GND)	Power return node - requires local 10 nF decoupling to minimize noise coupling
5	V_CC+	Positive supply pin - supports 1.5–5.5 V; must be bypassed near pin
6	Inverting input (Channel B)	Independent input for second signal path (e.g., dual-lead ECG)
7	Non-inverting input (Channel B)	Second sensor interface point with same rail-to-rail input range as Channel A
8	Output (Channel B)	Second rail-to-rail output - enables dual-channel simultaneous acquisition

Key Features

Feature	Design Value
Power-on initialization trimming	Guarantees 200 µV max V_io after each power cycle - eliminates need for factory calibration
Rail-to-rail I/O	Full dynamic range utilization from 1.5 V supply - maximizes ADC resolution in low-voltage systems
Ultra-low input bias current	1 pA typ. - prevents loading errors in high-Z electrochemical or piezoelectric sensors
EMI-hardened architecture	63 dB rejection at 2400 MHz - maintains signal integrity near wireless transceivers without shielding
Extended temperature operation	Specified from -40 °C to +125 °C - supports sterilization cycles and body-temperature environments

Applications

ECG Signal Conditioning

Pulse Oximeter Front-End

Use Scenario: Amplifying microvolt-level biopotential signals from dry electrodes in portable ECG patches.

IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier core - Channel A for lead I, Channel B for lead II - with matched DC specs for common-mode rejection.

Use Value: 200 µV max V_io and 10 µA/channel current enable <1 µV baseline drift over 24 h at room temperature, meeting AHA Class I diagnostic thresholds.

Use Scenario: Simultaneous red (660 nm) and IR (940 nm) photodiode current-to-voltage conversion in wrist-worn SpO₂ sensors.

IC Role / Device Role / Timing Role: Two independent transimpedance amplifiers - each configured with 1 MΩ feedback for optimal SNR and bandwidth.

Use Value: 1 pA input bias current prevents photodiode leakage-induced gain error; rail-to-rail output ensures full ADC code utilization across varying skin tones.

Glucose Monitor Sensor Interface

Wearable Fall Detection Accelerometer Analog Front-End

Use Scenario: Amplifying amperometric current from enzyme-based glucose oxidase electrodes in continuous monitoring systems.

IC Role / Device Role / Timing Role: Low-noise, low-drift transducer amplifier - configured as 3-op-amp IA with OA2MPA34S as input stage.

Use Value: 10 µV/°C max V_io drift and 10 µA quiescent current allow <0.5% glucose reading error across body temperature range (32–42 °C) with 3 V coin-cell operation.

Use Scenario: Conditioning analog outputs from MEMS accelerometers in fall-detection wearables requiring always-on motion analysis.

IC Role / Device Role / Timing Role: Dual-channel DC-coupled buffer and level-shifter - converting ±2 g accelerometer output to 0–3.3 V for SAR ADC sampling.

Use Value: 1.5 V minimum supply allows direct connection to buck-boost regulators; 125 °C rating supports enclosure thermal stress during extended charging cycles.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV9002IDR	Higher 60 µA supply current; 1 MHz GBP; 0.3 mV max V_io; SOIC-8 package	Better speed but 6× higher power - suitable for non-battery-critical diagnostics	Select when bandwidth >500 kHz is required and power budget allows ≥60 µA/channel
OPA2333AIDR	Zero-drift architecture; 17 µA supply current; 350 kHz GBP; 10 µV max V_io; SOIC-8	Lower offset drift but larger die size and cost - preferred for lab-grade instrumentation	Select when long-term stability (<0.02 µV/°C) outweighs battery life constraints

Compared with TLV9002IDR and OPA2333AIDR, OA2MPA34S uniquely balances ultra-low power (10 µA), medical-grade precision (200 µV V_io), and EMI resilience - making it optimal for certified wearable devices where regulatory test margins and multi-year battery life are mandatory.

Availability

OA2MPA34S is available at Aetrix Electronics and suitable for wearable health monitors, fitness trackers, and portable medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OA2MPA34S 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, specializing in automotive, industrial, and personal electronics solutions with strong IP in analog, power, and microcontroller technologies.

The OA2MPA34S belongs to ST's OAxMPA precision op amp family, designed specifically for ultra-low-power, high-accuracy analog signal conditioning in battery-operated medical and fitness devices - emphasizing DC precision, ESD/EMI robustness, and extended temperature reliability.

FAQ

What is the maximum recommended capacitive load for OA2MPA34S in unity-gain configuration?

The OA2MPA34S remains stable with up to 100 pF capacitive load in unity-gain configuration, as verified by phase margin measurements (≥45°) and closed-loop gain plots in the datasheet. For loads exceeding 100 pF, a series resistor (≥10 Ω) between output and capacitor is required to maintain stability - confirmed via Figure 13 (closed-loop gain vs. capacitive load) and application note AN4912.

Does OA2MPA34S require external passive components for ESD protection on input pins?

No. OA2MPA34S incorporates integrated ESD protection rated to 4 kV HBM on all pins, eliminating need for external TVS diodes in standard wearable designs. Its internal clamping structure handles transient events without latch-up (200 mA immunity) or parameter shift - validated per JEDEC JESD22-A114 and documented in Table 2 Absolute Maximum Ratings.

Can OA2MPA34S operate reliably at 1.5 V supply with full rail-to-rail output swing?

Yes. OA2MPA34S guarantees rail-to-rail output operation down to 1.5 V supply, delivering ≤75 mV above V_CC- and ≤40 mV below V_CC+ into 10 kΩ load - confirmed by Figures 8–10 (output current vs. voltage) and Table 3 Operating Conditions. Performance remains fully specified across -40 °C to +125 °C at this voltage.

How does the power-on initialization affect system timing in battery-powered applications?

Initialization completes within 5 ms at 25 °C and 5 V (max 60 ms at -40 °C), during which V_io and I_CC stabilize to final values. This fixed delay must be accounted for in wake-up sequences - e.g., microcontroller should delay ADC sampling until t_init expires. No software intervention is needed; the process is fully autonomous and repeatable per power cycle.

OA2MPA34S Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Amplifier Type:: CMOS

Number of Circuits:: 2

Output Type:: Rail-to-Rail

Slew Rate:: 0.06V/µs

Gain Bandwidth Product:: 150 kHz

-3db Bandwidth:: -

Current - Input Bias:: 1 pA

Voltage - Input Offset:: 200 µV

Current - Supply:: 10µA (x2 Channels)

Current - Output / Channel:: 56 mA

Voltage - Supply Span (Min):: 1.5 V

Voltage - Supply Span (Max):: 5.5 V

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-MiniSO

OA2MPA34S FAQ

1.How can I place an order for OA2MPA34S through Aetrix?

Please submit a Request for Quotation (RFQ) for OA2MPA34S on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for OA2MPA34S reliable?

The price and inventory of OA2MPA34S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OA2MPA34S is usually 5 days.

3.What payment methods are accepted for OA2MPA34S?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OA2MPA34S transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for OA2MPA34S?

OA2MPA34S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your OA2MPA34S order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for OA2MPA34S?

For technical support, including OA2MPA34S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OA2MPA34S requirements.

6.How does Aetrix verify that OA2MPA34S is sourced from the original manufacturer or authorized distributors?

All OA2MPA34S products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that OA2MPA34S meets industry standards.

7.What is the process for return or replacement of OA2MPA34S?

All OA2MPA34S units undergo pre-shipment inspection (PSI). If there is an issue with OA2MPA34S, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The OA2MPA34S part is unused and in its original packaging.

Return procedure for OA2MPA34S:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-11 Comparator Circuit: Voltage Thresholds, Op-Amp Differences, LM393 and Practical Design

Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.

2026-09-10 Schmitt Trigger Explained: Hysteresis, Circuits, Inverters and Applications

Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …