Part A
AD8226ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5044 Stückzahl
- Package
- MSOP-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Compatible functional replacement candidate
The AD8226ARMZ and AD8220WARMZ-RL are both instrumentation amplifiers in the same 8-lead MSOP package with comparable supply ranges and gain configurations, making them a viable functional replacement candidate. However, the AD8220WARMZ-RL is an automotive-qualified variant with a JFET input stage, so input bias current, noise, and qualification requirements must be validated against the target application before substitution.
Package Type
High match
Supply Voltage Range
High match
Input Stage Type
Validation required
Qualification Grade
Validation required
Parts at a glance
Part B
AD8220WARMZ-RL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8951 Stückzahl
- Package
- TSSOP-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8226ARMZ | AD8220WARMZ-RL | Why it matters |
|---|---|---|---|
| Amplifier Type | Instrumentation Amplifier | Instrumentation Amplifier with JFET Input | The AD8220 uses a JFET input stage, giving it much lower input bias current, which is critical for high-impedance sensor interfaces. |
| Input Bias Current (typ) | ~10 nA | ~10 pA | Lower input bias current reduces errors when interfacing with high source-impedance sensors such as pH probes or photodiodes. |
| Input Offset Voltage (max) | ~150 µV | ~250 µV | Offset voltage directly adds to measurement error; a lower offset improves DC accuracy in precision signal chains. |
| Gain Bandwidth Product | ~1.5 MHz (G=1) | ~1.5 MHz (G=1) | Bandwidth determines the maximum signal frequency the amplifier can process while maintaining gain accuracy. |
| Input Voltage Noise (typ) | ~22 nV/√Hz | ~14 nV/√Hz | Lower voltage noise improves resolution for small-signal measurements, especially in low-frequency precision applications. |
| Supply Voltage Range | ±2.25 V to ±18 V (4.5 V to 36 V) | ±2.25 V to ±18 V (4.5 V to 36 V) | Wide supply range enables operation from both single low-voltage rails and higher bipolar supplies in industrial systems. |
| Operating Temperature Range | −40 °C to +125 °C | −40 °C to +125 °C | Industrial temperature range ensures reliable operation in harsh environments and automotive/industrial applications. |
| Package | 8-Lead MSOP (RMZ) | 8-Lead MSOP (RMZ), Tape & Reel | Same package footprint allows drop-in board replacement, though the AD8220 variant is supplied on tape and reel for automated assembly. |
| CMRR (min, G=10) | ~80 dB | ~80 dB | Common-mode rejection ratio determines how well the amplifier rejects unwanted common-mode signals, critical for noisy industrial environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8226ARMZ | AD8220WARMZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Series | - | Automotive |
| Part Status | Active | Active |
| Amplifier Type | Instrumentation | Instrumentation |
| Number of Circuits | 1 | 1 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 0.6V/µs | 2V/µs |
| -3 dB Bandwidth | 1.5 MHz | 1.5 MHz |
| Current - Input Bias | 20 nA | 25 pA |
| Voltage - Input Offset | 100 µV | 250 µV |
| Supply Current | 350µA | 750µA |
| Current - Output / Channel | 13 mA | 15 mA |
| Voltage - Supply Span(Min) | 2.2 V | 4.5 V |
| Voltage - Supply Span(Max) | 36 V | 36 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AD8226ARMZ and AD8220WARMZ-RL?
The AD8226ARMZ is a wide-supply-range instrumentation amplifier with a gain set by a single external resistor, specified for supply voltages from ±2.25 V to ±18 V (or 4.5 V to 36 V single supply). The AD8220WARMZ-RL is a JFET-input instrumentation amplifier with rail-to-rail output, specified for ±2.25 V to ±18 V supplies and offered in an 8-lead MSOP (RM) package in tape-and-reel form. The AD8220WARMZ-RL is an automotive-grade (W) variant, while the AD8226ARMZ is the standard industrial grade.
Are the AD8226ARMZ and AD8220WARMZ-RL pin-compatible?
Both devices are offered in an 8-lead MSOP (RM) package, but pin compatibility must be verified against the respective datasheets because the gain-setting and reference pin functions differ between the two products. The AD8226 uses a single external resistor between the RG pins to set gain, while the AD8220 uses a different gain configuration. Designers should confirm pin functions before considering a direct replacement.
What is the input stage architecture of each device?
The AD8226ARMZ uses a bipolar input stage, while the AD8220WARMZ-RL uses a JFET input stage. The JFET input of the AD8220 provides very low input bias current, making it suitable for high-impedance sensor interfaces, whereas the AD8226 bipolar input offers different bias current and noise characteristics.
Which device is better suited for high-impedance sensor applications?
The AD8220WARMZ-RL, with its JFET input stage, provides significantly lower input bias current than the bipolar-input AD8226ARMZ, making it preferable for high-impedance sources such as pH sensors or photodiode interfaces where bias current errors must be minimized. The AD8226ARMZ remains suitable for lower-impedance bridge and transducer applications.
What supply voltage ranges do these instrumentation amplifiers support?
Both the AD8226ARMZ and AD8220WARMZ-RL are specified for dual supplies of ±2.25 V to ±18 V, or equivalently 4.5 V to 36 V single supply, per their respective manufacturer datasheets. This wide range supports both battery-powered and industrial signal-conditioning designs.
Does the AD8220WARMZ-RL carry automotive qualification?
The "W" prefix in AD8220WARMZ-RL denotes the automotive-grade variant per Analog Devices nomenclature, and the "-RL" suffix indicates tape-and-reel packaging. Designers should confirm the specific AEC-Q qualification status and temperature grade in the official Analog Devices datasheet before use in automotive applications.
How is gain configured on each device?
The AD8226ARMZ sets gain with a single external resistor connected between its RG pins, following the datasheet gain equation. The AD8220WARMZ-RL also uses an external gain resistor, but the gain equation and resistor value differ from the AD8226. The specific gain resistor values must be taken from each product's respective datasheet and are not interchangeable.
Can the AD8226ARMZ and AD8220WARMZ-RL be used interchangeably in an existing design?
They should not be treated as drop-in replacements. Differences in input stage (bipolar vs. JFET), input bias current, gain configuration, and qualification grade mean the circuit must be re-validated against the target datasheet. A substitution is only appropriate after confirming pin functions, gain resistor values, bias current effects, and qualification requirements for the specific application.