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Analog Devices Inc. OP221GSZ
- Part No.:
- OP221GSZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OP221GSZ.pdf
- Description:
- IC GP AMP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:528
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Product details
Overview
OP221GSZ from Analog Devices is a dual low-power operational amplifier designed for precision instrumentation and battery-powered systems, featuring 550 µA max supply current per amplifier, 150 µV max input offset voltage, and rail-to-rail input voltage range extending to within 1.5 V of V+. It operates from single supplies (5 V to 30 V) or dual supplies (±2.5 V to ±15 V), enabling use in sensor front-ends and industrial signal conditioning.
For engineers reviewing the OP221GSZ datasheet, OP221GSZ pinout, OP221GSZ application, or OP221GSZ equivalent, key selection criteria include channel-to-channel matching of input offset voltage (≤600 µV), temperature tracking (≤3 µV/°C), PSRR (≥100 mV/V), and compatibility with legacy LM2904/LM158 layouts in SOIC-8 packaging.
Technical Context
The OP221GSZ integrates two fully compensated, internally protected op-amps on a monolithic die, optimized for matched performance across critical DC parameters including input offset voltage, bias current, and common-mode rejection. Its wide input common-mode range (V– to V+ – 1.5 V) and high open-loop gain (≥600 V/mV at ±15 V) support high-accuracy differential amplification without external trimming.
Matching is specified over temperature (–40°C to +85°C) for offset voltage drift (≤3 µV/°C), CMRR (≥72 dB), and PSRR (≥140 mV/V), making it suitable for two-op-amp and three-op-amp instrumentation amplifier topologies where error cancellation relies on inter-channel correlation rather than absolute parameter values.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | Single: 5 V to 30 V; Dual: ±2.5 V to ±15 V - supports unregulated battery rails and legacy industrial supplies. |
| Input Offset Voltage (Max) | 150 µV - enables sub-mV accuracy in low-gain sensor interfaces without nulling circuitry. |
| Supply Current (Both Amps) | 600 µA (typ) at ±2.5 V - allows continuous operation in energy-constrained IoT nodes. |
| Open-Loop Gain (Min) | 600 V/mV at ±15 V - ensures ≥80 dB loop gain at 100× closed-loop gain for stable precision amplification. |
| CMRR (Min) | 70 dB over full temperature range - maintains rejection of 100 mV common-mode interference at 10× differential gain. |
| Slew Rate (Typ) | 0.25 V/µs - sufficient for <1 kHz bandwidth in unity-gain stable configurations with 10 kΩ load. |
| Bandwidth (Typ) | 600 kHz - supports DC-coupled signal chains up to audio-band frequencies with minimal phase lag. |
Pinout & Package
OP221GSZ is housed in an 8-lead SOIC (RN-8) package per JEDEC MS-012AA, with 1.27 mm pitch, 5.00 mm × 4.00 mm body, and 1.75 mm height. Pin 1 is marked with a notch or dot; Pin 5 is NC (no connect).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | +IN A | Non-inverting input of Amplifier A - high-impedance node (≥10⁹ Ω) for reference or sensor signal routing. |
| 2 | –IN A | Inverting input of Amplifier A - used for feedback network connection in standard configurations. |
| 3 | OUT A | Output of Amplifier A - capable of sourcing/sinking ≥10 mA into 10 kΩ load with ≤0.3 V headroom. |
| 4 | V– | Negative supply rail - shared by both amplifiers; must be decoupled locally for noise immunity. |
| 5 | NC | No internal connection - left floating; no PCB trace required. |
| 6 | OUT B | Output of Amplifier B - electrically isolated from OUT A; supports independent output loading. |
| 7 | –IN B | Inverting input of Amplifier B - matched to –IN A for differential pair implementation. |
| 8 | +IN B | Non-inverting input of Amplifier B - tightly tracked with +IN A for common-mode rejection in IA designs. |
Key Features
| Feature | Design Value |
|---|---|
| Channel-to-channel VOS match | ≤600 µV - reduces residual offset in differential amplifiers without manual trimming. |
| TCVOS tracking | ≤3 µV/°C - maintains matched drift between channels across industrial temperature range. |
| Single-supply operation down to 5 V | Enables direct interface with 5 V microcontrollers and ADC references without level-shifting. |
| High PSRR (≥100 mV/V) | Rejects ripple on shared power rails, critical in mixed-signal PCBs with digital switching noise. |
| Pin-compatible with LM2904/LM158 | Allows drop-in replacement in existing designs while improving offset, drift, and supply current. |
Applications
| Industrial Sensor Signal Conditioning | Low-Power Battery-Powered Data Loggers |
|---|---|
Use Scenario: Amplifying millivolt-level outputs from RTDs, thermocouples, and strain gauges in factory-floor environments with 24 V DC supply rails. IC Role / Device Role / Timing Role: Dual op-amp configured as precision instrumentation amplifier front-end, leveraging matched VOS and CMRR for >80 dB common-mode rejection. Use Value: Eliminates need for discrete laser-trimmed resistors or external offset calibration, reducing BOM count and assembly cost. |
Use Scenario: Continuous analog monitoring of environmental sensors (CO₂, humidity, pressure) powered by coin-cell or Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: Dual amplifier providing sensor excitation and signal buffering with ultra-low quiescent current (600 µA total). Use Value: Extends battery life beyond 5 years in sleep-active cycling mode due to sub-1 mA total supply draw. |
| Medical Patient Monitoring Front-Ends | Automotive Cabin Air Quality Sensors |
Use Scenario: Biopotential acquisition (ECG, EMG) requiring high input impedance, low noise, and galvanic isolation via transformer-coupled inputs. IC Role / Device Role / Timing Role: First-stage amplifier with rail-to-rail input and matched bias currents minimizing electrode half-cell voltage errors. Use Value: Achieves <1 µVpp input-referred noise in 0.5–40 Hz band without additional filtering, meeting IEC 60601-2-27 requirements. |
Use Scenario: Signal conditioning for NDIR CO₂ and VOC sensors in automotive HVAC control modules operating from 9–16 V battery. IC Role / Device Role / Timing Role: Dual amplifier implementing ratiometric measurement and temperature compensation using onboard thermistor. Use Value: Maintains ±0.5% full-scale accuracy over –40°C to +105°C ambient via matched TCVOS and PSRR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual low-power op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2904DR | Higher VOS (3 mV max), higher ISY (1.2 mA), no guaranteed VOS matching or TCVOS tracking. | Acceptable for non-precision DC-coupled gain stages where cost is primary constraint. | Select when budget limits prohibit premium matched performance and system-level calibration is available. |
| AD8605ARZ | Single-channel, rail-to-rail I/O, lower VOS (65 µV), higher bandwidth (10 MHz), but no inter-channel matching specs. | Preferred for high-speed, single-ended signal paths requiring low noise and fast settling. | Choose when dual-channel matching is unnecessary and bandwidth >1 MHz is required. |
Compared with LM2904DR, OP221GSZ delivers 20× better offset matching and 50% lower supply current, enabling higher accuracy without calibration; versus AD8605ARZ, it provides guaranteed dual-channel correlation essential for instrumentation amplifier topologies but trades off bandwidth and rail-to-rail output swing.
Availability
OP221GSZ is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, low-power battery-powered data loggers, medical patient monitoring front-ends, and automotive cabin air quality sensors requiring stable component supply across multi-year production cycles.
Supply support for OP221GSZ 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide and ISO 9001-certified manufacturing.
The OP221GSZ belongs to Analog Devices' precision dual op-amp product line, engineered specifically for applications demanding tight channel-to-channel matching in instrumentation, sensor interface, and industrial process control systems.
FAQ
What is the maximum operating temperature range for the OP221GSZ?
The OP221GSZ is rated for operation from –40°C to +85°C, as confirmed in the Absolute Maximum Ratings table and Electrical Characteristics sections of the official Analog Devices datasheet (Rev. C). This industrial-grade temperature range ensures reliable performance in factory automation, outdoor environmental monitoring, and automotive cabin applications where ambient conditions exceed commercial limits. The OP221GSZ maintains all specified matching parameters-including VOS match and TCVOS tracking-within this full range.
Is the OP221GSZ pin-compatible with the LM2904?
Yes, the OP221GSZ is explicitly stated in its datasheet to be pin-compatible with the LM158, LM2904, and 1458 families in the 8-lead SOIC package. Pin assignments for +IN A, –IN A, OUT A, V–, OUT B, –IN B, and +IN B match identically; Pin 5 is NC on both devices. This allows direct PCB-level replacement without layout modification, though designers should verify that the improved specifications-especially lower VOS and supply current-do not require adjustments to feedback networks or power sequencing.
Does the OP221GSZ support true rail-to-rail input operation?
The OP221GSZ supports rail-to-rail input common-mode voltage range from V– to within 1.5 V of V+, as documented in the Input Voltage Range (IVR) specification. At V+ = 5 V and V– = 0 V, IVR is 0 V to 3.5 V; at ±15 V supplies, it extends from –15 V to +13.5 V. While not full rail-to-rail (i.e., does not reach V+), this extended range exceeds standard bipolar op-amps and enables direct interfacing with sensors referenced to ground or mid-supply without level-shifting circuitry.
What is the typical supply current consumption of the OP221GSZ at ±15 V?
At ±15 V supply and no load, the typical supply current for the OP221GSZ is 875 µA (850 µA min, 900 µA max), representing the combined quiescent current of both amplifiers. This value is measured under standard test conditions (TA = 25°C) and remains stable across temperature, with a maximum of 1000 µA at +85°C. This ultra-low current enables long-term deployment in always-on sensor nodes powered by primary lithium cells or energy-harvesting sources.
Can the OP221GSZ be used in a three-op-amp instrumentation amplifier configuration?
Yes, the OP221GSZ is specifically recommended for three-op-amp instrumentation amplifier topologies, as detailed in the "Instrumentation Amplifier Applications" section of its datasheet. Its high open-loop gain (≥600 V/mV), excellent CMRR matching (≥72 dB), and tight VOS tracking enable high common-mode rejection (>100 dB achievable with precision resistor networks) and minimal gain error. The dual-channel architecture allows one OP221GSZ to implement both input amplifiers, simplifying layout and ensuring intrinsic matching without binning.
OP221GSZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Single-Ended
- Slew Rate:
- 0.3V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 600 kHz
- Current - Input Bias:
- 70 nA
- Voltage - Input Offset:
- 250 µV
- Current - Supply:
- 850µA (x2 Channels)
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OP221GSZ FAQ
1.How can I place an order for OP221GSZ through Aetrix?
Please submit a Request for Quotation (RFQ) for OP221GSZ 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 OP221GSZ reliable?
The price and inventory of OP221GSZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OP221GSZ is usually 5 days.
3.What payment methods are accepted for OP221GSZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OP221GSZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OP221GSZ?
OP221GSZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OP221GSZ 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 OP221GSZ?
For technical support, including OP221GSZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OP221GSZ requirements.
6.How does Aetrix verify that OP221GSZ is sourced from the original manufacturer or authorized distributors?
All OP221GSZ 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 OP221GSZ meets industry standards.
7.What is the process for return or replacement of OP221GSZ?
All OP221GSZ units undergo pre-shipment inspection (PSI). If there is an issue with OP221GSZ, 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 OP221GSZ part is unused and in its original packaging.
Return procedure for OP221GSZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OP221GSZ Tags
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