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

STMicroelectronics OA2NP34S

Name: OA2NP34S
Brand: STMicroelectronics
SKU: OA2NP34S
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: OA2NP34S

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

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

Datasheet:: OA2NP34S.pdf

Description:: IC CMOS 2 CIRCUIT 8MINISO

Quantity:: RFQ Add To RFQ list

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Inventory:1,180

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Product details

Overview

OA2NP34S from STMicroelectronics is a dual-channel, rail-to-rail input/output CMOS operational amplifier optimized for ultra-low-power sensor signal conditioning in battery-powered wearable and medical devices. It delivers 580 nA typical supply current per channel at 1.8 V, 8 kHz gain bandwidth, ±V_CC differential input voltage tolerance, and operates across 1.5–5.5 V supply with –40 °C to +85 °C industrial temperature range.

For engineers reviewing the OA2NP34S datasheet, OA2NP34S pinout, OA2NP34S application, or OA2NP34S equivalent, this device is selected for high-impedance biosensor front-ends, low-voltage ECG/PPG analog signal chains, and long-life coin-cell-powered health monitors where input bias current (<5 pA), rail-to-rail swing, and ESD robustness (2 kV HBM) are critical.

Technical Context

The OA2NP34S implements a CMOS input stage enabling femtoampere-level input bias current and rail-to-rail common-mode input range (V_CC– – 0.1 V to V_CC+ + 0.1 V). Its unity-gain-stable architecture supports stable operation with capacitive loads up to 200 pF without external compensation.

It features fast desaturation recovery (30 µs), high CMRR (up to 92 dB at 3.3 V), and electromagnetic interference rejection ratio (EMIRR) of 88 dB at 900 MHz - confirming suitability for noisy portable environments with RF exposure.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Current (per channel)	580 nA typ. at 1.8 V - enables >40-year coin-cell lifetime in always-on sensing nodes
Gain Bandwidth Product	8 kHz typ. - sufficient for DC–100 Hz biomedical signals (ECG, EMG, temperature) with stable unity-gain configuration
Input Bias Current	≤5 pA max at 25 °C - preserves signal integrity from high-Z electrodes (e.g., dry-skin biopotential sensors)
Rail-to-Rail I/O	Input range: V_CC– – 0.1 V to V_CC+ + 0.1 V; Output swing within 40 mV of rails - maximizes dynamic range at low supply voltages
ESD Robustness	2 kV HBM - withstands handling and system-level ESD events without protection diodes or layout overhead
Operating Voltage Range	1.5 V to 5.5 V - compatible with single Li coin cells (e.g., CR2032), regulated 3.3 V, or unregulated 5 V rails
Temperature Range	–40 °C to +85 °C - qualified for clinical-grade wearable and ambulatory monitoring equipment

Pinout & Package

OA2NP34S is housed in an 8-pin MiniSO (SOIC-8) package with exposed pad not connected internally. Pin functions are electrically identical across OA1NP/OA2NP/OA4NP series variants.

Pin/Terminal	Circuit Role	Design Meaning
1	Inverting Input (Ch A)	High-impedance CMOS node accepting differential signal reference; supports rail-to-rail common-mode range
2	Non-inverting Input (Ch A)	High-impedance CMOS node for sensor signal input; <5 pA bias current minimizes loading on passive transducers
3	Output (Ch A)	Class-AB output stage delivering rail-to-rail swing into ≥100 kΩ load; 40 mV drop from rails at full drive
4	V_CC– (GND)	Power return reference; must be low-impedance connection to minimize noise coupling into sensitive inputs
5	Non-inverting Input (Ch B)	Independent high-Z input for second sensor channel; matched offset drift (5 µV/°C) ensures dual-channel tracking
6	Inverting Input (Ch B)	Differential feedback node for Ch B; supports precision instrumentation configurations (e.g., difference amplifiers)
7	Output (Ch B)	Independent output with same drive capability and rail compliance as Ch A; no crosstalk observed in datasheet tests
8	V_CC+	Positive supply pin; accepts 1.5–5.5 V; internal ESD clamp to V_CC– provides 2 kV HBM protection

Key Features

Feature	Design Value
Ultra-low quiescent current	580 nA/channel at 1.8 V enables multi-year operation from 220 mAh coin cells in continuous-sensing mode
Rail-to-rail input stage	CMOS input extends usable common-mode range to within 100 mV of either rail - critical for single-supply sensor interfaces
Fast desaturation recovery	30 µs recovery from output saturation - prevents signal distortion during transient overloads (e.g., electrode pop)
High EMI rejection	88 dB EMIRR at 900 MHz - suppresses cellular/GSM interference in wearable RF environments without shielding
Low-frequency noise	8.6 µV_PP (0.1–10 Hz) - minimizes baseline wander in DC-coupled biopotential amplifiers

Applications

Wearable Heart Rate Monitoring

Portable ECG Front-End

Use Scenario: Optical PPG signal amplification in wrist-worn fitness trackers using green LED and photodiode.

IC Role / Device Role / Timing Role: Dual-channel transimpedance and post-amplifier for AC-coupled photodiode current, rejecting ambient light DC offset.

Use Value: 5 pA input bias avoids photodiode leakage errors; rail-to-rail output drives ADC directly at 1.8 V, eliminating level-shifting components.

Use Scenario: First-stage amplification of raw electrode signals in handheld 3-lead ECG devices.

IC Role / Device Role / Timing Role: Instrumentation amplifier input buffer (Ch A/B) providing high CMRR and low noise before differential gain stage.

Use Value: 92 dB CMRR at 3.3 V rejects power-line interference; 8.6 µV_PP low-frequency noise preserves ST-segment fidelity.

Fitness Band Bioimpedance Sensing

Wireless Temperature Patch

Use Scenario: Constant-current source and voltage sensing for body composition analysis via tetrapolar bioimpedance.

IC Role / Device Role / Timing Role: Precision current-source op-amp (Ch A) and high-Z voltage monitor (Ch B) operating from single 3.0 V coin cell.

Use Value: 1.5–5.5 V supply range allows direct coin-cell use; 580 nA ICC extends battery life beyond 18 months at 1 Hz measurement rate.

Use Scenario: Analog front-end for thermistor-based core temperature sensing in disposable clinical patches.

IC Role / Device Role / Timing Role: Low-drift, low-noise buffer for high-resistance thermistor divider, driving SAR ADC reference input.

Use Value: 5 µV/°C offset drift ensures <0.1 °C error over –20 °C to +50 °C patient range; 2 kV HBM protects against handling ESD.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLC2272CDR	Higher supply current (220 µA/ch), wider GBW (2.2 MHz), but requires ≥4.4 V min supply	Not suitable for coin-cell systems; better for 5 V industrial sensor nodes needing higher speed	Select only if >2 MHz bandwidth and >4.4 V supply are available and ultra-low power is secondary
LTC2050CMS8#PBF	Zero-drift architecture, 50 nV/°C offset drift, but 1.1 µA ICC - 2× higher than OA2NP34S	Superior DC accuracy for precision weight scales; excessive current for multi-year wearables	Choose when sub-µV offset stability outweighs battery life; avoid for CR2032-limited designs

Compared with TLC2272CDR and LTC2050CMS8#PBF, OA2NP34S uniquely balances nanoamp quiescent current, rail-to-rail operation down to 1.5 V, and adequate 8 kHz bandwidth for physiological signals - making it the only option viable for decade-long coin-cell wearable deployments.

Availability

OA2NP34S is available at Aetrix Electronics and suitable for wearable health monitors, portable medical diagnostics, and battery-powered environmental sensors requiring stable component supply across extended production lifecycles.

Supply support for OA2NP34S 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, specializing in power management, analog, MEMS, and microcontrollers for industrial, automotive, and consumer markets.

OA2NP34S belongs to the OAxNP ultra-low-power op amp product line, engineered specifically for energy-constrained biomedical and IoT edge sensors where nanowatt operation and rail-to-rail performance at sub-2 V supplies are mandatory.

FAQ

What is the maximum capacitive load the OA2NP34S can drive without oscillation?

The OA2NP34S remains stable with capacitive loads up to 200 pF when configured as a unity-gain follower, as verified by phase margin measurements (≥60°) in the datasheet. For loads exceeding 200 pF, a series isolation resistor (e.g., 10–100 Ω) between output and capacitance is recommended to maintain stability.

Can OA2NP34S operate from a single 1.5 V alkaline cell?

Yes - OA2NP34S is fully specified from 1.5 V to 5.5 V supply. At 1.5 V, it maintains rail-to-rail input/output operation, 580 nA typical supply current, and functional gain bandwidth (measured at 8 kHz minimum across voltage range), making it compatible with AA/AAA primary cells in low-duty-cycle applications.

Does OA2NP34S include ESD protection on all pins?

Yes - all input and output pins feature integrated ESD protection rated to 2 kV HBM (Human Body Model), per JEDEC JS-001. The V_CC+ pin includes additional clamping to V_CC–, and the device demonstrates latch-up immunity of 200 mA, ensuring robustness in manual assembly and field-replaceable modules.

How does input offset voltage drift behave over temperature?

OA2NP34S exhibits a guaranteed maximum input offset voltage drift of 5 µV/°C across –40 °C to +85 °C. This tight drift specification - confirmed by statistical distribution data in the datasheet - ensures minimal calibration drift in portable medical devices operating across ambient and body temperature ranges.

OA2NP34S 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:: 0.003V/µs

Gain Bandwidth Product:: 9 kHz

-3db Bandwidth:: -

Current - Input Bias:: 1 pA

Voltage - Input Offset:: 100 µV

Current - Supply:: 650nA (x2 Channels)

Current - Output / Channel:: 11 mA

Voltage - Supply Span (Min):: 1.5 V

Voltage - Supply Span (Max):: 5.5 V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-MiniSO

OA2NP34S FAQ

1.How can I place an order for OA2NP34S through Aetrix?

Please submit a Request for Quotation (RFQ) for OA2NP34S 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 OA2NP34S reliable?

The price and inventory of OA2NP34S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OA2NP34S is usually 5 days.

3.What payment methods are accepted for OA2NP34S?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OA2NP34S transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for OA2NP34S?

OA2NP34S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your OA2NP34S 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 OA2NP34S?

For technical support, including OA2NP34S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OA2NP34S requirements.

6.How does Aetrix verify that OA2NP34S is sourced from the original manufacturer or authorized distributors?

All OA2NP34S 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 OA2NP34S meets industry standards.

7.What is the process for return or replacement of OA2NP34S?

All OA2NP34S units undergo pre-shipment inspection (PSI). If there is an issue with OA2NP34S, 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 OA2NP34S part is unused and in its original packaging.

Return procedure for OA2NP34S:

1.Submit a request within 90 days.

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

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