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STMicroelectronics OA2NP22Q
- Part No.:
- OA2NP22Q
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN
- Datasheet:
-
OA2NP22Q.pdf
- Description:
- IC CMOS 2 CIRCUIT 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,852
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Product details
Overview
OA2NP22Q 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 draws just 580 nA per channel at 1.8 V, operates from 1.5 V to 5.5 V, delivers 8 kHz gain bandwidth, supports –40 °C to +85 °C industrial temperature range, and features 5 pA max input bias current - enabling accurate interfacing with high-impedance biosensors and piezoresistive elements.
For engineers reviewing the OA2NP22Q datasheet, OA2NP22Q pinout, OA2NP22Q application, or OA2NP22Q equivalent, key selection criteria include its sub-1 µA quiescent current, rail-to-rail swing at 1.5 V supply, low input offset drift (5 µV/°C), ESD robustness (2 kV HBM), and DFN8 2×2 mm package suitability for space-constrained health-monitoring PCBs.
Technical Context
The OA2NP22Q implements a CMOS input stage with complementary differential pairs, enabling rail-to-rail common-mode input voltage range (VCC– – 0.1 V to VCC+ + 0.1 V) and output swing within 40 mV of either rail under 100 kΩ load. Its unity-gain-stable architecture uses internal compensation to ensure phase margin ≥60° across 1.5–5.5 V supply and capacitive loads up to 60 pF.
Designed for DC-coupled, low-frequency (<10 kHz) precision amplification, it avoids phase reversal under overdrive and supports fast desaturation recovery (30 µs) - critical for pulse oximetry front-ends and ECG lead-off detection circuits where transient fidelity and long-term DC stability are mandatory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply current per channel | 580 nA typ. at 1.8 V - enables >10-year operation on 220 mAh coin cell in always-on sensing nodes |
| Input bias current | 5 pA max at 25 °C - preserves signal integrity when amplifying from >1 GΩ electrode impedances |
| Gain bandwidth product | 8 kHz typ. - sufficient for DC–100 Hz biomedical waveforms (ECG, PPG, EMG) with stable closed-loop gain |
| Input offset voltage | ±3.4 mV max over –40 to +85 °C - ensures <0.5% error in 0.5 V full-scale sensor outputs without trimming |
| Rail-to-rail I/O | VIN = VCC– – 0.1 V to VCC+ + 0.1 V; VOUT = VCC– + 40 mV to VCC+ – 40 mV - maximizes dynamic range at 1.5 V supply |
| ESD rating | 2 kV HBM - withstands handling and board-level transients in clinical-grade wearable assembly |
| Operating temperature | –40 °C to +85 °C - qualified for core body-worn and ambient-sensing environments |
Pinout & Package
OA2NP22Q is housed in a thermally enhanced DFN8 2×2 mm package with exposed thermal pad (EP), compatible with standard reflow profiles and offering 117 °C/W junction-to-ambient thermal resistance. Pin 1 is marked by a dot; the EP must be soldered to PCB ground for optimal thermal performance and EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC+) | Positive supply | Accepts 1.5–5.5 V; decoupling capacitor (100 nF) required within 2 mm for stability |
| 2 (IN1–) | Inverting input, Channel 1 | High-impedance CMOS node; sensitive to layout-induced leakage; guard ring recommended |
| 3 (IN1+) | Non-inverting input, Channel 1 | Matches IN1– characteristics; used for reference-driven instrumentation topologies |
| 4 (OUT1) | Output, Channel 1 | Rail-to-rail swing; drive capability limited to ±4 mA; isolate from capacitive loads >60 pF |
| 5 (OUT2) | Output, Channel 2 | Independent output; shares supply rails; avoid shared feedback paths to prevent crosstalk |
| 6 (IN2+) | Non-inverting input, Channel 2 | Electrically isolated from Channel 1 inputs; supports dual-sensor synchronous acquisition |
| 7 (IN2–) | Inverting input, Channel 2 | Matched to IN2+; enable differential pair configurations for noise rejection |
| 8 (VCC–) | Negative supply / Ground | Return path for both channels; connect EP directly to this plane for lowest noise |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 580 nA/channel at 1.8 V enables multi-year battery life in continuous-sensing wearables |
| Rail-to-rail input and output | Full utilization of 1.5 V supply headroom - essential for single-supply, low-voltage biosignal chains |
| Low input bias current | 5 pA max preserves accuracy with high-Z sensors (e.g., dry electrodes, pH probes) |
| Fast desaturation recovery | 30 µs return from rail saturation - prevents baseline shift in pulse-based physiological measurements |
| EMI robustness | 88 dB rejection at 900 MHz - maintains signal integrity near Bluetooth/Wi-Fi radios in compact wearables |
Applications
| ECG Front-End Amplifier | Pulse Oximeter Analog Signal Chain |
|---|---|
|
Use Scenario: Amplifying microvolt-level cardiac signals from dry or Ag/AgCl electrodes in portable ECG patches. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier input buffer and gain stage, operating in DC-coupled mode with 0.05–150 Hz bandwidth. Use Value: Sub-1 µA supply current extends patch battery life beyond 7 days; rail-to-rail I/O captures full QRS complex amplitude at 1.8 V supply. |
Use Scenario: Conditioning red and infrared photodiode currents in wrist-worn SpO₂ monitors. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) stage converting photocurrent to voltage, followed by DC-blocking and filtering. Use Value: 5 pA input bias current minimizes TIA offset error; 8 kHz GBP supports >100 Hz sampling of plethysmographic waveforms. |
| Glucose Sensor Interface | Wearable Temperature Monitoring |
|
Use Scenario: Amplifying low-current amperometric output from enzymatic glucose biosensors in smart patches. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with programmable gain, operating continuously during glucose tracking. Use Value: 3.4 mV max input offset ensures <1 mg/dL quantization error; low drift (5 µV/°C) maintains calibration over body-temperature shifts. |
Use Scenario: Reading output from thermistors or digital temperature sensors in hearables and fitness bands. IC Role / Device Role / Timing Role: Low-noise buffer and level-shifter for analog temperature sensor outputs feeding ADC inputs. Use Value: 8.6 µVpp low-frequency noise (0.1–10 Hz) prevents thermal resolution loss; 2 kV HBM protects against user-handling ESD. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-power op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC2272CDR | Higher supply current (220 µA/ch), wider supply range (2.2–16 V), higher GBP (2.2 MHz) | Suitable for higher-speed industrial sensors but incompatible with coin-cell lifetime targets | Select only if >100 kHz bandwidth or >5 V supply is required; not drop-in for OA2NP22Q's ultra-low-power use cases |
| MAX44260ASA+ | Lower supply current (350 nA/ch), lower input bias (0.1 pA), but narrower supply (1.8–5.5 V) and no specified rail-to-rail output at 1.8 V | Better for femtoampere-level electrochemical sensors, but requires validation of output swing at minimum voltage | Prefer for ultra-high-impedance applications where bias current dominates error; verify output compliance at 1.5 V before adoption |
Compared with TLC2272CDR and MAX44260ASA+, OA2NP22Q uniquely balances sub-µA quiescent current, guaranteed rail-to-rail operation down to 1.5 V, and industrial temperature qualification - making it the only choice for long-life, single-supply, body-worn biosignal amplifiers.
Availability
OA2NP22Q is available at Aetrix Electronics and suitable for wearable health monitors, fitness trackers, and portable medical instrumentation requiring stable component supply across multi-year production cycles.
Supply support for OA2NP22Q 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.
The OAxNP series was developed specifically for ultra-low-power analog signal conditioning in battery-constrained medical and wearable systems - prioritizing nanoampere operation, rail-to-rail functionality at sub-2 V supplies, and long-term DC stability.
FAQ
Can OA2NP22Q operate reliably from a 1.5 V alkaline battery?
Yes. The OA2NP22Q is fully specified from 1.5 V to 5.5 V supply, with rail-to-rail input/output and stable 8 kHz gain bandwidth confirmed at 1.5 V in the datasheet's electrical characteristics tables. Its 580 nA typical supply current ensures minimal voltage droop during extended operation.
Is the exposed pad (EP) on the DFN8 package electrically connected?
Yes - the exposed pad is internally connected to VCC– (pin 8). It must be soldered to a PCB ground plane to ensure thermal dissipation (RthJA = 117 °C/W), reduce noise coupling, and maintain ESD robustness. Floating or unconnected EP degrades performance and reliability.
Does OA2NP22Q support comparator operation?
Yes - the datasheet explicitly covers "Using the OA1NP, OA2NP, OA4NP series in comparator mode" (Section 4.9), confirming safe open-loop operation with fast desaturation (30 µs) and no phase reversal. However, dedicated comparators offer faster response; use OA2NP22Q only when dual-function (amplifier/comparator) is needed in space-constrained designs.
What is the maximum capacitive load the output can drive without instability?
The OA2NP22Q remains stable with ≤60 pF capacitive load when using unity-gain configuration and proper PCB layout. For larger loads (e.g., ADC input capacitance), a series isolation resistor (RISO ≥1 kΩ) between output and load is required - values are tabulated in Figure 31 of the datasheet based on load capacitance.
OA2NP22Q Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-WFDFN
- 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-DFN (2x2)
OA2NP22Q FAQ
1.How can I place an order for OA2NP22Q through Aetrix?
Please submit a Request for Quotation (RFQ) for OA2NP22Q 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 OA2NP22Q reliable?
The price and inventory of OA2NP22Q are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OA2NP22Q is usually 5 days.
3.What payment methods are accepted for OA2NP22Q?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OA2NP22Q transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OA2NP22Q?
OA2NP22Q orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OA2NP22Q 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 OA2NP22Q?
For technical support, including OA2NP22Q datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OA2NP22Q requirements.
6.How does Aetrix verify that OA2NP22Q is sourced from the original manufacturer or authorized distributors?
All OA2NP22Q 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 OA2NP22Q meets industry standards.
7.What is the process for return or replacement of OA2NP22Q?
All OA2NP22Q units undergo pre-shipment inspection (PSI). If there is an issue with OA2NP22Q, 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 OA2NP22Q part is unused and in its original packaging.
Return procedure for OA2NP22Q:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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