Part A
AD8221ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4567 PCS
- Package
- SOIC-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8221ARZ and AD8221AR-REEL are functionally identical, sharing the same precision instrumentation amplifier die, package, and electrical specifications; the only distinction is the delivery format, with the REEL variant supplied on tape and reel for automated assembly. Either part number can be used interchangeably in the same design, and selection should be driven solely by production packaging requirements.
Package Type
High match
Amplifier Architecture
High match
Electrical Specifications
High match
Delivery Format
High match
Parts at a glance
Part B
AD8221AR-REEL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6955 PCS
- Package
- SOIC-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8221ARZ | AD8221AR-REEL | Why it matters |
|---|---|---|---|
| Amplifier Type | Instrumentation Amplifier | Instrumentation Amplifier | Confirms both parts are the same functional amplifier type, so they are interchangeable in the same circuit role. |
| Number of Channels | 1 | 1 | Both provide a single instrumentation amplifier channel, ensuring identical signal-path architecture. |
| Gain Bandwidth Product | 825 kHz | 825 kHz | Determines the achievable closed-loop bandwidth at a given gain; matching values ensure equivalent frequency performance. |
| Input Offset Voltage (max) | 60 µV | 60 µV | Low offset voltage is critical for precision DC measurements; identical limits mean equivalent accuracy. |
| Input Bias Current (max) | 1.5 nA | 1.5 nA | Low bias current minimizes errors in high-impedance sensor interfaces; matching values ensure comparable performance. |
| Common-Mode Rejection Ratio (min) | 80 dB | 80 dB | CMRR governs rejection of common-mode noise; identical minimums ensure equivalent noise immunity. |
| Supply Voltage Range | ±2.3 V to ±18 V | ±2.3 V to ±18 V | Defines compatible power rails; matching ranges allow direct substitution in the same supply design. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Ensures both parts meet the same environmental operating conditions for the target application. |
| Package / Mounting | 8-SOIC (tube) | 8-SOIC (tape and reel) | Same SOIC package and footprint, but different packaging format affects assembly handling and pick-and-place production. |
| Packaging / Ordering Format | Tube | Tape & Reel | Determines how parts are supplied for manufacturing; reel packaging suits automated SMT lines while tubes suit low-volume or manual assembly. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8221ARZ | AD8221AR-REEL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Obsolete |
| Amplifier Type | Instrumentation | Instrumentation |
| Number of Circuits | 1 | 1 |
| Slew Rate | 2V/µs | 2V/µs |
| -3 dB Bandwidth | 825 kHz | 825 kHz |
| Current - Input Bias | 500 pA | 500 pA |
| Voltage - Input Offset | 60 µV | 60 µV |
| Supply Current | 900µA | 900µA |
| Current - Output / Channel | 18 mA | 18 mA |
| Voltage - Supply Span(Min) | 4.6 V | 4.6 V |
| Voltage - Supply Span(Max) | 36 V | 36 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the difference between AD8221ARZ and AD8221AR-REEL?
Both parts are the same AD8221 instrumentation amplifier die in an 8-lead SOIC package (R-8 suffix). The difference is packaging format: AD8221ARZ is supplied in tube/tray quantities, while AD8221AR-REEL is supplied on tape-and-reel for automated pick-and-place assembly. The "Z" suffix in AD8221ARZ denotes RoHS-compliant lead finish per Analog Devices nomenclature.
Are AD8221ARZ and AD8221AR-REEL electrically and functionally identical?
Yes. Both are the AD8221 gain-programmable instrumentation amplifier with the same specified performance: gain set by a single external resistor (G = 1 to 1000), typical CMRR of 90 dB at G = 1 (80 dB minimum), typical input offset voltage of 60 µV maximum at G = 1, and typical gain drift of 10 ppm/°C. Package and die are identical; only the delivery format differs.
Can AD8221ARZ and AD8221AR-REEL be used interchangeably in a design?
Yes, from an electrical and footprint standpoint they are interchangeable, since both use the same 8-lead SOIC (R-8) package and pinout. The choice depends on assembly method: AD8221AR-REEL is intended for reel-fed automated placement, while AD8221ARZ is typically supplied in tubes for manual or low-volume assembly.
What is the specified supply voltage range for the AD8221?
The AD8221 operates on dual supplies from ±2.3 V to ±18 V, corresponding to a total supply voltage of 4.6 V to 36 V. Both AD8221ARZ and AD8221AR-REEL share this specification.
What gain range does the AD8221 support, and how is gain set?
Gain is programmed with a single external resistor connected between the RG pins, covering G = 1 (resistor open) up to G = 1000. The gain equation is G = 1 + 49.4 kΩ / RG. This applies equally to AD8221ARZ and AD8221AR-REEL.
What are the key DC accuracy specifications of the AD8221?
Verified datasheet values include maximum input offset voltage of 60 µV at G = 1 (RTI), maximum input offset drift of 0.8 µV/°C, minimum CMRR of 80 dB at G = 1 (90 dB typical), and typical input bias current of 1.5 nA maximum. These specifications apply to both ordering variants.
What is the operating temperature range for AD8221ARZ and AD8221AR-REEL?
Both variants are specified over the industrial temperature range of −40 °C to +85 °C, as defined in the Analog Devices AD8221 datasheet for the A-grade SOIC package.
Does the tape-and-reel format of AD8221AR-REEL affect moisture sensitivity or handling requirements?
No. Both AD8221ARZ and AD8221AR-REEL use the same 8-lead SOIC package with the same moisture sensitivity level (MSL 1 per the Analog Devices datasheet), so reflow and handling requirements are identical regardless of delivery format.