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

STMicroelectronics OA1NP22C

Name: OA1NP22C
Brand: STMicroelectronics
SKU: OA1NP22C
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: OA1NP22C

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 5-TSSOP, SC-70-5, SOT-353

Datasheet:: OA1NP22C.pdf

Description:: IC CMOS 1 CIRCUIT SC70-5

Quantity:: RFQ Add To RFQ list

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Inventory:2,265

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Product details

Overview

OA1NP22C from STMicroelectronics is a single-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 at 1.8 V, 8 kHz gain bandwidth, ±V_CC differential input voltage tolerance, and operates across 1.5–5.5 V supply range with –40 °C to +85 °C industrial temperature rating.

For engineers reviewing the OA1NP22C datasheet, OA1NP22C pinout, OA1NP22C application, or OA1NP22C equivalent, this op amp is selected for high-impedance sensor interfaces requiring sub-1 µA quiescent current, rail-to-rail swing near coin-cell voltages, ESD-hardened (2 kV HBM) operation, and long-term offset stability in fitness monitors and point-of-care diagnostics.

Technical Context

The OA1NP22C employs a CMOS input stage enabling 5 pA max input bias current and rail-to-rail common-mode input range (V_CC– – 0.1 V to V_CC+ + 0.1 V), supporting direct interfacing with resistive and capacitive sensors without level-shifting. Its unity-gain-stable architecture achieves 60° phase margin and 10 dB gain margin with 60 pF capacitive load.

Designed for low-voltage precision, it maintains 65–85 dB CMRR over 0–1.8 V common-mode range at 1.8 V supply and exhibits <5 µV/°C input offset drift - critical for unattended multi-day physiological measurements where thermal gradients induce minimal baseline shift.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply current	580 nA typ. at 1.8 V - enables >42-year coin-cell lifetime in always-on biosensor front-ends
Gain bandwidth product	8 kHz typ. - sufficient for DC–100 Hz bio-signal amplification (ECG, PPG, EMG) with stable closed-loop response
Input bias current	5 pA max at 25 °C - preserves signal integrity from high-Z electrodes (>100 MΩ skin contact impedance)
Rail-to-rail I/O	V_IN = V_CC– – 0.1 V to V_CC+ + 0.1 V; V_OUT swings within 40 mV of rails - maximizes dynamic range on 1.8 V supply
Input offset voltage	±3.4 mV max over –40 to +85 °C - ensures <0.5% gain error in 100× instrumentation amplifier configurations
ESD tolerance	2 kV HBM - protects against handling-induced transients during PCB assembly and field deployment
Operating voltage	1.5 V to 5.5 V - supports direct connection to CR2032 (3.0 V), Li-SOCl₂ (3.6 V), or regulated 1.8 V/3.3 V rails

Pinout & Package

OA1NP22C is housed in SC70-5 package (2.0 mm × 1.25 mm, 0.65 mm pitch), optimized for space-constrained wearables. The exposed pad is not present in SC70-5; thermal dissipation relies on PCB copper area under the body.

Pin	Circuit Role	Design Meaning
1	Inverting input (–)	Accepts feedback network or sensor return path; high-impedance node (5 pA bias) minimizes loading on passive sensors
2	Non-inverting input (+)	Connects directly to high-Z sensor output (e.g., thermistor divider, pH electrode); rail-to-rail common-mode range avoids clipping
3	Ground (V_CC–)	Reference for single-supply operation; must be low-impedance path to minimize noise coupling into sensitive inputs
4	Output	Drives ADC input or next-stage filter; 40 mV rail headroom enables full-scale digitization with 12-bit+ SAR ADCs
5	Supply (V_CC+)	Accepts 1.5–5.5 V; internal regulation not required - simplifies power tree in energy-harvesting systems

Key Features

Feature	Design Value
Ultra-low quiescent current	580 nA typ. per channel at 1.8 V - extends CR2032 battery life beyond 42 years in sleep-mode sensor nodes
Rail-to-rail input/output	V_IN and V_OUT operate within 100 mV of supply rails - preserves >95% of available voltage headroom at 1.8 V
High ESD robustness	2 kV HBM - eliminates need for external TVS diodes in wearable enclosures with user-accessible connectors
Low input offset drift	5 µV/°C max - limits temperature-induced baseline walk to <0.5 mV over 85 °C ambient range
Unity-gain stability	Stable with 60 pF capacitive load - supports direct driving of ADC input capacitance without isolation resistor

Applications

Wearable Heart Rate Monitor

Fitness Band Bio-Impedance Sensor

Use Scenario: Amplifying weak photoplethysmography (PPG) signals from green LED/photodiode pair on wristband.

IC Role / Device Role / Timing Role: Single-ended transimpedance amplifier front-end with 100 kΩ feedback resistor, operating continuously at 1.8 V from CR2032.

Use Value: 580 nA supply current enables >3-year battery life; rail-to-rail output drives 12-bit ADC full-scale without gain adjustment.

Use Scenario: Conditioning AC-coupled bio-impedance measurement using 100 kHz excitation on finger electrodes.

IC Role / Device Role / Timing Role: Precision buffer between electrode interface and analog front-end, rejecting common-mode interference via high CMRR.

Use Value: 85 dB CMRR at 0–1.8 V common-mode range suppresses motion-induced artifacts; 5 pA input bias prevents electrode polarization.

Portable ECG Patch

Disposable Glucose Monitor

Use Scenario: Low-noise amplification of microvolt-level ECG signals in dry-electrode patch with no gel contact.

IC Role / Device Role / Timing Role: First-stage instrumentation amplifier gain-setting buffer, powered by thin-film lithium battery (2.8 V).

Use Value: 8.6 µV_PP low-frequency noise (0.1–10 Hz) preserves ST-segment morphology; 2 kV HBM withstands clinical handling.

Use Scenario: Signal conditioning for amperometric glucose sensor output (nA-level current) in single-use test strip reader.

IC Role / Device Role / Timing Role: Transimpedance amplifier converting sensor current to voltage, operating from 3.0 V coin cell during 60-second assay.

Use Value: 5 pA input bias current prevents baseline drift during 30-second integration window; 40 mV output headroom ensures ADC linearity.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLC721CPW	Higher supply current (650 nA min), wider supply range (1.8–5.5 V), but only 1.5 kHz GBP and no guaranteed rail-to-rail output swing	Limited to slower sensor types (e.g., temperature) due to lower bandwidth; requires external rail clamping for full-range output	Select when cost sensitivity outweighs bandwidth and rail-swing requirements in non-medical consumer wearables
MAX40007AUT+	Lower input bias (0.1 pA), higher GBP (150 kHz), but 1.7 µA supply current - 3× higher than OA1NP22C	Suitable for high-speed biosensors (e.g., neural spike detection), but reduces CR2032 lifetime from 42 to <14 years	Choose only when >10 kHz signal bandwidth is mandatory and battery life is secondary to fidelity

Compared with TLC721CPW and MAX40007AUT+, OA1NP22C uniquely balances nanopower operation (580 nA), usable bandwidth (8 kHz), and true rail-to-rail swing - making it the only option meeting all three constraints for multi-year wearable medical sensors.

Availability

OA1NP22C is available at Aetrix Electronics and suitable for wearable health monitors, portable diagnostic instruments, and disposable medical sensors requiring stable component supply across multi-year production cycles.

Supply support for OA1NP22C 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 specializing in power management, analog, and microcontroller solutions for industrial, automotive, and healthcare markets.

OA1NP22C belongs to the OA1NP/OA2NP/OA4NP series - a family of nanopower CMOS op amps engineered specifically for ultra-long-life, low-voltage biomedical sensing applications where battery replacement is impractical.

FAQ

Can OA1NP22C drive an ADC input directly without an external buffer?

Yes. With 60° phase margin and unity-gain stability up to 60 pF capacitive load, OA1NP22C can directly drive typical SAR ADC input capacitances (5–20 pF) without oscillation or settling errors. Its 40 mV output headroom ensures full-scale accuracy when paired with 12-bit or 14-bit converters operating from the same 1.8 V rail.

What is the maximum source/sink current capability of OA1NP22C?

At 1.8 V supply, OA1NP22C delivers 4 mA sink and 4 mA source current (min) into 100 kΩ load while maintaining rail-to-rail output swing. This supports driving moderate loads like RC anti-aliasing filters or LED indicators in low-duty-cycle wearable subsystems without external transistors.

How does OA1NP22C perform in comparator mode?

The datasheet confirms reliable comparator operation with 30 µs overload recovery time and no phase reversal. When used open-loop, its 8 kHz GBP limits response to ~100 µs for large-slew transitions, making it suitable for slow threshold-detection tasks (e.g., battery voltage monitoring) but not high-speed zero-crossing detection.

Is the SC70-5 package of OA1NP22C compatible with standard reflow profiles?

Yes. The SC70-5 package meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) and is qualified for standard lead-free reflow profiles (peak 260 °C, 60 s above 217 °C). No pre-bake is required, simplifying SMT assembly for high-volume wearable manufacturing.

OA1NP22C Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 5-TSSOP, SC-70-5, SOT-353

Packaging:: Tape & Reel (TR)

Product Status:: Active

Amplifier Type:: CMOS

Number of Circuits:: 1

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

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:: SC-70-5

OA1NP22C FAQ

1.How can I place an order for OA1NP22C through Aetrix?

Please submit a Request for Quotation (RFQ) for OA1NP22C 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 OA1NP22C reliable?

The price and inventory of OA1NP22C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OA1NP22C is usually 5 days.

3.What payment methods are accepted for OA1NP22C?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OA1NP22C transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for OA1NP22C?

OA1NP22C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your OA1NP22C 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 OA1NP22C?

For technical support, including OA1NP22C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OA1NP22C requirements.

6.How does Aetrix verify that OA1NP22C is sourced from the original manufacturer or authorized distributors?

All OA1NP22C 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 OA1NP22C meets industry standards.

7.What is the process for return or replacement of OA1NP22C?

All OA1NP22C units undergo pre-shipment inspection (PSI). If there is an issue with OA1NP22C, 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 OA1NP22C part is unused and in its original packaging.

Return procedure for OA1NP22C:

1.Submit a request within 90 days.

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

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