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 AD8220ARMZ-RL share the same SOIC-8 package, single-supply architecture, and instrumentation amplifier function, making them viable functional substitutes in many designs. However, the AD8220ARMZ-RL offers a wider supply range and higher bandwidth while the AD8226ARMZ provides a broader gain range and lower input bias current, so gain-setting resistors and supply rails must be revalidated before substitution.
Package Type
High match
Amplifier Function
High match
Supply Voltage Range
Validation required
Gain Bandwidth Product
Validation required
Parts at a glance
Part B
AD8220ARMZ-RL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3523 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 | AD8220ARMZ-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 max offset improves DC accuracy in precision signal chains. |
| Gain Bandwidth Product | 1.5 MHz | 1.5 MHz | Bandwidth determines the maximum signal frequency the amplifier can process at a given gain. |
| Input Voltage Noise (1 kHz) | 22 nV/√Hz | 14 nV/√Hz | Lower voltage noise improves signal-to-noise ratio for low-level signals, making the AD8220 preferable for sensitive measurements. |
| 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 allows operation from battery-powered systems up to industrial rails. |
| CMRR (G=100, DC) | 100 dB | 100 dB | High common-mode rejection is essential for extracting small differential signals in the presence of large common-mode noise. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +85 °C | The wider temperature range of the AD8226 suits harsher industrial environments, while the AD8220 is limited to standard commercial/industrial ranges. |
| Package | 8-Lead MSOP | 8-Lead MSOP | Identical package and pinout enable drop-in board-level substitution without layout changes. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8226ARMZ | AD8220ARMZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Obsolete |
| 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 ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AD8226ARMZ and AD8220ARMZ-RL?
The AD8226ARMZ is a wide supply range, rail-to-rail output instrumentation amplifier with a single external resistor gain setting, while the AD8220ARMZ-RL is a JFET-input instrumentation amplifier optimized for high source impedance and low input bias current. The AD8226ARMZ operates on supplies from ±2.25 V to ±18 V (or 4.5 V to 36 V single supply), whereas the AD8220ARMZ-RL operates on ±2.25 V to ±18 V as well but features JFET inputs with typical input bias current in the picoampere range. The AD8220ARMZ-RL is supplied in a 500-unit reel (RL suffix), while the AD8226ARMZ is supplied in standard tube packaging.
Can the AD8226ARMZ and AD8220ARMZ-RL be used interchangeably in the same circuit?
No, they are not direct drop-in replacements. Although both are 8-lead MSOP instrumentation amplifiers with similar pinouts, the AD8226ARMZ uses bipolar transistor inputs with higher input bias current, while the AD8220ARMZ-RL uses JFET inputs with much lower input bias current and different input voltage noise and offset characteristics. Circuit performance, particularly in high-impedance source applications, will differ significantly, so substitution requires validation against the datasheet specifications.
Which part is better suited for high source impedance sensors?
The AD8220ARMZ-RL is better suited for high source impedance sensors because its JFET inputs provide very low input bias current (typically in the picoampere range), minimizing voltage errors across high-impedance sources. The AD8226ARMZ, with bipolar inputs, has higher input bias current and is more appropriate for lower source impedance applications.
What is the gain setting method for each device?
Both the AD8226ARMZ and AD8220ARMZ-RL set gain using a single external resistor connected between the RG pins. The gain equation for the AD8226ARMZ is G = 1 + (49.4 kΩ / RG), and for the AD8220ARMZ-RL the gain equation is G = 1 + (49.4 kΩ / RG) as well, allowing flexible gain programming from unity to high values with a single resistor.
What are the supply voltage ranges for the AD8226ARMZ and AD8220ARMZ-RL?
Both devices operate over a wide supply range. The AD8226ARMZ operates from ±2.25 V to ±18 V dual supplies or 4.5 V to 36 V single supply. The AD8220ARMZ-RL operates from ±2.25 V to ±18 V dual supplies or 4.5 V to 36 V single supply. Both are specified for operation over the −40 °C to +125 °C temperature range.
What package and pin configuration do these parts use?
Both the AD8226ARMZ and AD8220ARMZ-RL are offered in an 8-lead MSOP (Mini Small Outline Package). The pinout is functionally similar, with pins for −IN, +IN, RG, and output, but designers should confirm pin functions against the respective datasheets before layout or substitution, as internal differences exist between the bipolar and JFET input architectures.
How do the input bias current specifications compare?
The AD8220ARMZ-RL, with JFET inputs, has a typical input bias current in the picoampere range (approximately 10 pA typical at room temperature), making it suitable for high-impedance sources. The AD8226ARMZ, with bipolar inputs, has a typical input bias current in the nanoampere range (approximately 10 nA typical), which is orders of magnitude higher and can introduce offset errors with high source impedances.
What does the RL suffix on AD8220ARMZ-RL indicate?
The RL suffix indicates the packaging format: the AD8220ARMZ-RL is supplied on a 500-unit reel for automated assembly. The AD8226ARMZ without an RL suffix is typically supplied in standard tube packaging. The electrical specifications of the device are identical regardless of packaging suffix; only the delivery format differs.