Part A
AD8220WARMZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 5929 PCS
- Package
- MSOP-8
- Series
- Amplificateurs linéaires - instruments, amplificateurs opérationnels, amplificateurs tampons
Replacement verdict
Compatible functional replacement candidate
The AD8226ARMZ and AD8220WARMZ are both instrumentation amplifiers in the same 8-lead MSOP package with comparable supply ranges and gain-setting architectures, making the AD8220WARMZ a viable functional candidate for the AD8226ARMZ in many designs. However, the AD8220WARMZ is an automotive-qualified JFET-input device with a different input bias current profile and bandwidth, so input source impedance, noise, and qualification requirements must be validated before substitution.
Package Type
High match
Supply Voltage Range
High match
Input Bias Current
Validation required
Bandwidth
Validation required
Parts at a glance
Part B
AD8226ARMZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 5044 PCS
- Package
- MSOP-8
- Series
- Amplificateurs linéaires - instruments, amplificateurs opérationnels, amplificateurs tampons
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 | Why it matters |
|---|---|---|---|
| Amplifier Type | Instrumentation Amplifier | Instrumentation Amplifier (JFET input) | Both are in-amps, but the AD8220 uses a JFET input stage, which affects input bias current and input impedance, influencing suitability for high-impedance sensor interfaces. |
| Number of Channels | 1 | 1 | Both are single-channel devices, so channel count is not a differentiator for substitutability. |
| Input Bias Current (typ) | ~0.5 nA | ~10 pA | The JFET input of the AD8220 provides dramatically lower bias current, critical for high-source-impedance sensors where bias current causes offset errors. |
| Input Offset Voltage (max) | ~150 µV | ~250 µV | Lower offset voltage reduces DC error at the output; the AD8226 offers tighter offset, which matters for precision DC measurements. |
| Gain Bandwidth Product | ~1.5 MHz (G=1) | ~1.5 MHz (G=1) | Similar bandwidth means comparable AC signal handling capability for both parts. |
| Supply Voltage Range | ±2.3 V to ±18 V (4.6 V to 36 V) | ±2.25 V to ±18 V (4.5 V to 36 V) | Nearly identical supply ranges allow either part to operate in the same power rails, supporting drop-in substitution in most supplies. |
| Supply Current (typ) | ~350 µA | ~750 µA | The AD8226 draws roughly half the quiescent current, which matters for low-power and battery-operated designs. |
| CMRR (min, G=10) | ~80 dB | ~80 dB | Comparable common-mode rejection ensures similar performance in rejecting common-mode noise from sensor lines. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical temperature ratings mean both parts suit the same industrial and automotive environments. |
| Package | 8-Lead MSOP (RMZ) | 8-Lead MSOP (RMZ) | Same package and pinout enable direct PCB footprint compatibility, easing physical substitution. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8220WARMZ | AD8226ARMZ |
|---|---|---|
| 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 | 2V/µs | 0.6V/µs |
| -3 dB Bandwidth | 1.5 MHz | 1.5 MHz |
| Current - Input Bias | 25 pA | 20 nA |
| Voltage - Input Offset | 250 µV | 100 µV |
| Supply Current | 750µA | 350µA |
| Current - Output / Channel | 15 mA | 13 mA |
| Voltage - Supply Span(Min) | 4.5 V | 2.2 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 primary functional differences between the AD8226ARMZ and AD8220WARMZ?
The AD8226ARMZ is a wide-supply-range, rail-to-rail output instrumentation amplifier optimized for general-purpose precision signal conditioning, while the AD8220WARMZ is an automotive-qualified JFET-input instrumentation amplifier designed for high source-impedance and low-bias-current applications. The AD8220WARMZ carries an AEC-Q100 qualification for automotive use, whereas the AD8226ARMZ is an industrial-grade part.
Are the AD8226ARMZ and AD8220WARMZ pin-compatible in the same package?
Both devices are offered in an 8-lead MSOP (RMZ) package, but pin compatibility must be verified against the respective datasheets before substitution, because the internal architecture and specified external connections differ between the two products. Designers should confirm the pin function assignments and recommended external component connections for each part.
How do the input bias currents of the AD8226ARMZ and AD8220WARMZ compare?
The AD8220WARMZ uses a JFET input stage and is specified with very low input bias current, making it suitable for high-impedance sensor interfaces. The AD8226ARMZ uses a different input topology with correspondingly higher bias current specifications. Exact bias current values should be taken from the respective manufacturer datasheets for the specific grade and temperature range.
Which device is better suited for automotive applications?
The AD8220WARMZ is the automotive-qualified option, as indicated by the "W" grade designation and AEC-Q100 qualification, and it is specified over the extended automotive temperature range. The AD8226ARMZ is an industrial-grade instrumentation amplifier and is not presented as an automotive-qualified part.
Do both amplifiers support rail-to-rail output swing?
Yes, both the AD8226ARMZ and AD8220WARMZ are specified with rail-to-rail output swing, allowing output signals to approach the supply rails. The exact output voltage swing limits depend on load conditions and supply voltage and should be confirmed from the respective datasheets.
Can the AD8226ARMZ and AD8220WARMZ operate from the same supply voltages?
Both devices support dual-supply and single-supply operation over a range of supply voltages, but the specified operating ranges and performance limits differ between the two parts. The AD8226ARMZ is specified for a wide supply range suitable for general industrial signal conditioning, while the AD8220WARMZ supply range and specifications are defined for its automotive-qualified operating conditions. Verify the exact supply limits in each datasheet before designing a common supply rail.
Which part should be selected for high source-impedance sensor interfaces?
The AD8220WARMZ, with its JFET input stage and low input bias current, is generally the preferred choice for high source-impedance sensors where bias current errors must be minimized. The AD8226ARMZ remains suitable for many general-purpose precision applications but has higher input bias current specifications.
Are the AD8226ARMZ and AD8220WARMZ drop-in replacements for each other?
They should not be treated as drop-in replacements without full validation. Although both are 8-lead MSOP instrumentation amplifiers, differences in input architecture, bias current, qualification grade, and specified operating conditions mean that circuit performance, external component values, and compliance requirements must be re-verified against the manufacturer datasheets before substitution.