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STMicroelectronics OA2ZHA22Q
- Part No.:
- OA2ZHA22Q
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
OA2ZHA22Q.pdf
- Description:
- IC OPAMP ZERO-DRIFT 2 CIRC 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:29,160
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Product details
Overview
OA2ZHA22Q from STMicroelectronics is a dual-channel, chopper-stabilized, rail-to-rail input/output operational amplifier optimized for ultra-precision signal conditioning in low-power wearable and medical sensor interfaces. It delivers 5 µV max input offset voltage at 25 °C, 8 µV over –40 °C to 125 °C, 400 kHz gain bandwidth, 40 µA max supply current at 5 V, and operates from 1.8 V to 5.5 V supply.
For engineers reviewing the OA2ZHA22Q datasheet, OA2ZHA22Q pinout, OA2ZHA22Q application, or OA2ZHA22Q equivalent, this device is selected for high-accuracy analog front-ends where zero-drift performance, EMI robustness (84–91 dB EMIRR), and extended temperature stability are critical - especially in fitness monitors, portable ECG nodes, and low-side current sensing circuits.
Technical Context
The OA2ZHA22Q implements a synchronous chopper architecture with 400 kHz internal clock modulation/demodulation to eliminate 1/f noise and minimize input offset drift. Its CMOS input stage enables ultra-low input bias current (≤300 pA over temperature) and rail-to-rail common-mode input range (VCC– −0.1 V to VCC+ +0.1 V).
It features integrated ESD protection (4 kV HBM), high PSRR (120–140 dB), and stable operation with capacitive loads up to 100 pF. The device achieves 0.17–0.19 V/µs slew rate and 10–50 µs settling time to 0.1%, supporting precision DC and low-frequency AC signal amplification without calibration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input offset voltage | 5 µV max at 25 °C; ensures <±10 µV total error in 12-bit systems without trimming |
| Offset drift | 10–30 nV/°C; maintains sub-100 µV total offset shift across –40 °C to 125 °C |
| Supply current per amp | 40 µA max at 5 V; enables >1-year battery life in coin-cell-powered wearables |
| Gain bandwidth product | 400 kHz; supports stable closed-loop gain ≥100 at ≤4 kHz signal bandwidth |
| Input bias current | 300 pA max over full temperature range; avoids significant voltage error in high-Z sensor interfaces (e.g., pH, thermopile) |
| EMI rejection ratio | 84–91 dB (400–2400 MHz); suppresses RF interference in wireless-enabled medical devices |
| Rail-to-rail output swing | 30 mV from rails into 10 kΩ load; preserves dynamic range in 1.8 V single-supply systems |
Pinout & Package
OA2ZHA22Q is packaged in DFN8 2×2 mm (pitch 0.5 mm) with exposed thermal pad. Pin 1 is marked by dot; exposed pad may be connected to VCC– or left floating for improved thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting input of Amp A | Accepts differential signal; rail-to-rail common-mode range supports direct sensor connection |
| 2 | Non-inverting input of Amp A | Low bias current (≤300 pA) minimizes error in high-impedance bridge or thermistor interfaces |
| 3 | Output of Amp A | Drives 10 kΩ load to within 30 mV of rails; stable with ≤100 pF capacitive load |
| 4 | VCC– | Ground reference; exposed pad tied here improves thermal resistance (57 °C/W) |
| 5 | VCC+ | Positive supply (1.8–5.5 V); PSRR >120 dB rejects supply ripple in noisy environments |
| 6 | Non-inverting input of Amp B | Independent channel enables dual-sensor readout (e.g., ECG lead I & II) on single die |
| 7 | Inverting input of Amp B | Matched offset and drift to Amp A enables common-mode rejection in instrumentation topologies |
| 8 | Output of Amp B | Same drive capability as Amp A; allows independent signal paths without cross-talk (120 dB channel separation) |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-stabilized architecture | Eliminates 1/f noise and reduces offset drift to ≤30 nV/°C - no system-level calibration required |
| Rail-to-rail I/O | Enables full utilization of 1.8 V supply headroom in battery-powered designs, maximizing ADC dynamic range |
| Ultra-low power | 40 µA per amplifier at 5 V allows integration of dual-channel precision gain stages in sub-100 µA total system budget |
| High EMI immunity | 84–91 dB EMIRR at cellular/Wi-Fi frequencies prevents RF rectification artifacts in clinical-grade biosensors |
| Extended temperature rating | Specified from –40 °C to 125 °C supports deployment in automotive cabin health monitors and industrial wearable gateways |
Applications
| Wearable Heart Rate Monitor | Precision Pulse Oximeter |
|---|---|
|
Use Scenario: Amplifying weak photodiode current from red/IR LEDs in wrist-worn PPG sensors under motion artifact. IC Role / Device Role / Timing Role: Dual-channel transimpedance amplifier (TIA) front-end with matched gain and offset for differential ambient light cancellation. Use Value: 5 µV offset and 30 nV/°C drift prevent baseline wander during temperature shifts; 40 µA/channel enables multi-day battery life on CR2032. |
Use Scenario: Conditioning low-level current from two synchronized photodiodes detecting oxygen saturation via red/IR absorption ratios. IC Role / Device Role / Timing Role: Synchronized dual TIA with rail-to-rail output driving 16-bit SAR ADC inputs directly. Use Value: 120 dB channel separation prevents crosstalk between red/IR channels; 400 kHz GBP supports fast pulse detection without phase lag. |
| Portable ECG Front-End | Low-Side Current Sensing |
|
Use Scenario: Amplifying microvolt-level biopotential signals from dry electrodes in handheld ECG devices. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier gain block (G = 100) with ultra-low noise and drift. Use Value: 37 nV/√Hz input noise at 1 kHz and <100 µV total offset error over temperature ensure diagnostic-grade SNR without recalibration. |
Use Scenario: Measuring motor or battery current via shunt resistor in compact IoT actuators and smart chargers. IC Role / Device Role / Timing Role: High-side or low-side current sense amplifier with precise gain accuracy and thermal stability. Use Value: 8 µV max offset over temperature limits current measurement error to <0.1% at 100 mΩ shunt - critical for battery SOC estimation. |
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 |
|---|---|---|---|
| AD8628ARZ-REEL7 | Single-channel, SOIC-8; 1 µV typ offset but 50 µA higher supply current (90 µA) | Lacks dual-channel integration; requires two devices for same functionality | Preferred when single-channel count suffices and board space allows SOIC packaging |
| MCP6V81-E/SN | Single-channel, SC70-5; 2 µV max offset but only rated to 125 °C (not guaranteed over full range) | No dual version available; lower ESD rating (2 kV HBM vs. 4 kV) | Suitable for cost-sensitive consumer wearables where extended temp spec is not mandatory |
Compared with AD8628ARZ-REEL7 and MCP6V81-E/SN, OA2ZHA22Q uniquely combines dual-channel integration, 4 kV ESD, guaranteed 125 °C operation, and 40 µA power in a 2×2 mm DFN - making it optimal for space-constrained, high-reliability medical edge nodes.
Availability
OA2ZHA22Q is available at Aetrix Electronics and suitable for wearable health monitors, portable medical diagnostics, and industrial condition monitoring requiring stable component supply with full production lifecycle support.
Supply support for OA2ZHA22Q 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, MEMS, and power solutions for industrial, automotive, and consumer markets.
OA2ZHA22Q belongs to ST's OAxZHA zero-drift op amp family, engineered specifically for ultra-low-error analog signal acquisition in battery-powered, miniaturized healthcare and fitness devices where calibration-free precision is mandatory.
FAQ
What package type is OA2ZHA22Q supplied in?
OA2ZHA22Q uses the DFN8 2×2 mm package with 0.5 mm pitch and an exposed thermal pad. This compact footprint supports high-density PCB layouts in wearables and portable medical devices while enabling efficient heat dissipation (57 °C/W junction-to-ambient).
Does OA2ZHA22Q require external filtering for chopper ripple?
Yes - the 400 kHz chopper clock generates low-amplitude output ripple. ST recommends adding a simple RC low-pass filter (e.g., 10 kΩ + 100 pF) at the output to suppress residual ripple below 100 Hz, especially in DC-coupled biosensor applications where sub-Hz stability is critical.
Can OA2ZHA22Q drive ADC inputs directly?
Yes - its rail-to-rail output swings to within 30 mV of VCC+ and VCC– into 10 kΩ, matching typical SAR ADC input ranges. Combined with 37 nV/√Hz noise and 10 µs settling time to 0.1%, it interfaces cleanly with 16-bit converters without buffer amplification.
Is the exposed pad of OA2ZHA22Q electrically connected?
The exposed pad is internally unconnected and may be soldered to VCC– (ground) for optimal thermal performance (57 °C/W), or left floating if board layout constraints prohibit grounding. ST confirms no electrical function is assigned to the pad in the DFN8 2×2 variant.
OA2ZHA22Q Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Zero-Drift
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.19V/µs
- Gain Bandwidth Product:
- 400 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 70 pA
- Voltage - Input Offset:
- 1 µV
- Current - Supply:
- 31µA (x2 Channels)
- Current - Output / Channel:
- 18 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
OA2ZHA22Q FAQ
1.How can I place an order for OA2ZHA22Q through Aetrix?
Please submit a Request for Quotation (RFQ) for OA2ZHA22Q 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 OA2ZHA22Q reliable?
The price and inventory of OA2ZHA22Q are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OA2ZHA22Q is usually 5 days.
3.What payment methods are accepted for OA2ZHA22Q?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OA2ZHA22Q transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OA2ZHA22Q?
OA2ZHA22Q orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OA2ZHA22Q 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 OA2ZHA22Q?
For technical support, including OA2ZHA22Q datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OA2ZHA22Q requirements.
6.How does Aetrix verify that OA2ZHA22Q is sourced from the original manufacturer or authorized distributors?
All OA2ZHA22Q 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 OA2ZHA22Q meets industry standards.
7.What is the process for return or replacement of OA2ZHA22Q?
All OA2ZHA22Q units undergo pre-shipment inspection (PSI). If there is an issue with OA2ZHA22Q, 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 OA2ZHA22Q part is unused and in its original packaging.
Return procedure for OA2ZHA22Q:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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