Part A
AD8220WARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5929 PCS
- Package
- MSOP-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8220WARMZ and AD8223BRM are both single-channel instrumentation amplifiers in 8-lead MSOP packages, making them a viable functional replacement candidate. However, the AD8220WARMZ offers a wider supply range, rail-to-rail output, and higher bandwidth, while the AD8223BRM provides a fixed gain of 100 and lower quiescent current. Designers should validate gain configuration, supply voltage, and bandwidth requirements before substituting.
Amplifier Type
High match
Package Type
High match
Supply Voltage Range
Validation required
Gain Configuration
Not compatible
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8220WARMZ | AD8223BRM | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 1 | 1 | Both are single-channel instrumentation amplifiers, so channel count is functionally equivalent. |
| Input Offset Voltage (max) | 250 µV | 100 µV | Lower offset improves DC accuracy in precision signal-conditioning applications. |
| Gain Range | 1 to 1000 (set by single resistor) | 5 to 1000 (set by single resistor) | AD8220 supports unity gain while AD8223 has a minimum gain of 5, affecting buffer vs. amplified configurations. |
| Input Bias Current (typ) | 10 pA | 25 nA | JFET input of AD8220 gives far lower bias current, critical for high-impedance sensor interfaces. |
| Input Voltage Noise (typ, 1 kHz) | 14 nV/√Hz | 27 nV/√Hz | Lower noise density improves resolution for small-signal measurements. |
| Supply Voltage Range | ±2.25 V to ±18 V (4.5 V to 36 V) | ±2 V to ±12 V (4 V to 24 V) | Wider supply range of AD8220 allows higher-voltage systems and greater headroom. |
| Supply Current (typ) | 750 µA | 500 µA | Lower quiescent current of AD8223 benefits battery-powered and low-power designs. |
| CMRR (min, G=10) | 80 dB | 80 dB | Common-mode rejection determines ability to extract small differential signals in noisy environments. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +85 °C | Extended temperature rating of AD8220 suits automotive and industrial environments. |
| Package | 8-Lead MSOP | 8-Lead MSOP | Identical package footprint enables drop-in board replacement without layout changes. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8220WARMZ | AD8223BRM |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Amplifier Type | Instrumentation | Instrumentation |
| Number of Circuits | 1 | 1 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 2V/µs | 0.3V/µs |
| -3 dB Bandwidth | 1.5 MHz | 200 kHz |
| Current - Input Bias | 25 pA | 12 nA |
| Voltage - Input Offset | 250 µV | 100 µV |
| Supply Current | 750µA | 650µA |
| Voltage - Supply Span(Min) | 4.5 V | 3 V |
| Voltage - Supply Span(Max) | 36 V | 24 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Series | Automotive | - |
| Current - Output / Channel | 15 mA | - |
Frequently asked questions
What are the key differences between the AD8220WARMZ and AD8223BRM instrumentation amplifiers?
The AD8220WARMZ is a JFET-input instrumentation amplifier with rail-to-rail output, specified for operation from ±2.25 V to ±18 V (or 4.5 V to 36 V single supply), with a gain range of 1 to 1000 set by a single resistor, and is qualified for automotive applications (W grade). The AD8223BRM is a lower-cost, fixed-gain or resistor-programmable instrumentation amplifier with a gain range of 5 to 1000, specified for ±2 V to ±12 V (or 4 V to 24 V single supply), and is not automotive-qualified. The AD8220 offers wider supply range, JFET input (lower input bias current), and automotive qualification, while the AD8223 is a more economical option with a minimum gain of 5.
Are the AD8220WARMZ and AD8223BRM pin-compatible?
No. The AD8220WARMZ is supplied in an 8-lead MSOP (RM) package, while the AD8223BRM is supplied in an 8-lead SOIC (RM) package. Although both are 8-lead packages, the package types differ (MSOP vs SOIC), so the PCB land patterns and footprints are not interchangeable. Refer to the respective datasheets for exact package dimensions and pin configurations.
What is the gain range of each device?
The AD8220WARMZ has a gain range of 1 to 1000, set by a single external resistor. The AD8223BRM has a gain range of 5 to 1000, also set by a single external resistor. The AD8223 cannot be configured for gains below 5, which is a key difference when selecting between the two parts.
How do the supply voltage requirements compare?
The AD8220WARMZ operates from ±2.25 V to ±18 V dual supplies (4.5 V to 36 V single supply). The AD8223BRM operates from ±2 V to ±12 V dual supplies (4 V to 24 V single supply). The AD8220 supports a wider maximum supply voltage, making it suitable for higher-voltage systems, while the AD8223 is limited to a lower maximum supply.
What are the input bias current characteristics of these two amplifiers?
The AD8220WARMZ uses a JFET input stage, which provides very low input bias current (typically in the picoampere range, per the datasheet). The AD8223BRM uses a bipolar input stage, resulting in higher input bias current (typically in the nanoampere range, per the datasheet). For high-impedance source applications, the AD8220's lower input bias current is advantageous.
Is the AD8220WARMZ automotive-qualified, and is the AD8223BRM?
Yes, the AD8220WARMZ is qualified for automotive applications, as indicated by the "W" grade designation in the part number. The AD8223BRM is a standard industrial-grade part and is not automotive-qualified. Designs requiring automotive qualification should use the AD8220WARMZ or another appropriately qualified device.
Can the AD8223BRM be used as a direct drop-in replacement for the AD8220WARMZ?
No. The two devices differ in package type (SOIC vs MSOP), minimum gain (5 vs 1), supply voltage range, input stage (bipolar vs JFET), and automotive qualification. A direct drop-in replacement is not possible without PCB redesign and verification of all electrical parameters against the target design requirements.