Part A
AD8227ARMZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 7701 個数
- Package
- MSOP-8
- Series
- リニアアンプ - 計装用、オペアンプ、バッファアンプ
Replacement verdict
Compatible functional replacement candidate
The AD8227ARMZ and AD8220WARMZ-RL are both single-channel instrumentation amplifiers in the same 8-lead MSOP package, making them a viable functional replacement candidate in many designs. However, the AD8220WARMZ-RL is an automotive-qualified variant with a JFET input stage, while the AD8227ARMZ uses a different input architecture, so gain-setting resistor values, input bias current behavior, and noise performance must be validated against the target application before substitution.
Package Type
High match
Channel Count
High match
Input Architecture
Validation required
Automotive Qualification
Validation required
Parts at a glance
Part B
AD8220WARMZ-RL
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 8951 個数
- Package
- TSSOP-8
- Series
- リニアアンプ - 計装用、オペアンプ、バッファアンプ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8227ARMZ | AD8220WARMZ-RL | Why it matters |
|---|---|---|---|
| Amplifier Type | Instrumentation Amplifier | Instrumentation Amplifier (JFET input) | Both are in-amps, but the AD8220 uses a JFET input stage while the AD8227 uses a bipolar input stage, which affects input bias current and noise behavior. |
| Number of Channels | 1 | 1 | Single-channel configuration is identical, so channel count does not affect substitutability. |
| Input Bias Current (typ) | 0.5 nA | 10 pA | The JFET input of the AD8220 provides far lower bias current, critical for high-impedance sensor interfaces where bias current causes offset errors. |
| Input Offset Voltage (max) | 100 µV | 250 µV | Lower offset voltage in the AD8227 reduces DC error in precision measurement applications. |
| Gain Bandwidth Product | 250 kHz | 1.5 MHz | The AD8220 offers higher bandwidth, enabling faster signal acquisition and wider frequency response. |
| Supply Voltage Range | 2.7 V to 36 V (±1.35 V to ±18 V) | 4.5 V to 36 V (±2.25 V to ±18 V) | The AD8227 operates at lower minimum supply, allowing use in low-voltage single-supply systems where the AD8220 cannot operate. |
| Input Voltage Noise (1 kHz) | 22 nV/√Hz | 14 nV/√Hz | Lower voltage noise in the AD8220 improves signal-to-noise ratio for low-level signal amplification. |
| CMRR (G=100, DC) | 100 dB | 100 dB | Equivalent common-mode rejection ensures similar performance in rejecting common-mode interference. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical temperature range supports use in the same industrial and automotive environments. |
| Package / Mounting | 8-Lead MSOP (Surface Mount) | 8-Lead MSOP (Surface Mount) | Same package and footprint allow direct board-level replacement without layout changes. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8227ARMZ | 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 | 0.8V/µs | 2V/µs |
| -3 dB Bandwidth | 250 kHz | 1.5 MHz |
| Current - Input Bias | 20 nA | 25 pA |
| Voltage - Input Offset | 200 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 primary functional differences between the AD8227ARMZ and the AD8220WARMZ-RL?
The AD8227ARMZ is a wide supply range, rail-to-rail output instrumentation amplifier with a fixed gain of 1 to 1000 set by a single external resistor, while the AD8220WARMZ-RL is a JFET-input instrumentation amplifier featuring rail-to-rail output and a digitally programmable gain of 1 to 1000 via a single resistor. The AD8220WARMZ-RL is qualified for automotive applications per the AEC-Q100 standard, whereas the AD8227ARMZ is an industrial-grade device.
Are the AD8227ARMZ and AD8220WARMZ-RL pin-compatible in the MSOP-8 package?
No. Although both devices are offered in an 8-lead MSOP package, their pinouts differ. The AD8227ARMZ uses the standard instrumentation amplifier pin configuration with the gain resistor between pins 1 and 8, while the AD8220WARMZ-RL has a different pin assignment including a reference pin and a different gain resistor connection. Designers must verify the pinout against the respective datasheets before considering any layout reuse.
How do the input bias currents of the AD8227ARMZ and AD8220WARMZ-RL compare?
The AD8220WARMZ-RL uses a JFET input stage, resulting in extremely low input bias current, typically in the picoampere range, which is suitable for high-impedance sensor interfaces. The AD8227ARMZ uses a bipolar input stage with input bias current in the nanoampere range. This difference is critical when selecting a device for high source-impedance applications.
What are the supply voltage ranges for the AD8227ARMZ and AD8220WARMZ-RL?
The AD8227ARMZ operates from a dual supply of ±2.25 V to ±18 V (or 4.5 V to 36 V single supply). The AD8220WARMZ-RL operates from a dual supply of ±2.25 V to ±18 V (or 4.5 V to 36 V single supply) as well. Both devices support a wide common supply range, but the AD8220WARMZ-RL is specified over the automotive temperature range of −40°C to +125°C.
Can the AD8220WARMZ-RL be used as a drop-in replacement for the AD8227ARMZ in an existing design?
No, a direct drop-in replacement is not possible due to differences in pinout, input stage topology, and gain configuration. The AD8220WARMZ-RL requires a different external gain resistor connection and has a JFET input stage with different bias current and noise characteristics. A redesign of the gain network and verification of the input source impedance compatibility are required.
Which device is better suited for automotive applications?
The AD8220WARMZ-RL is the appropriate choice for automotive applications because it is AEC-Q100 qualified and specified over the −40°C to +125°C temperature range. The AD8227ARMZ is an industrial-grade device and is not qualified to AEC-Q100, so it should not be used in automotive designs requiring that qualification.
How do the gain-setting methods differ between the AD8227ARMZ and AD8220WARMZ-RL?
Both devices set gain with a single external resistor, but the gain equation and resistor placement differ. For the AD8227ARMZ, the gain is set by a resistor between pins 1 and 8 with the gain equation G = 1 + (49.4 kΩ / R_G). For the AD8220WARMZ-RL, the gain resistor is connected between the designated RG pins with the gain equation G = 1 + (50 kΩ / R_G). The exact resistor value and connection must be taken from the respective datasheets.
What are the typical noise characteristics of the AD8227ARMZ and AD8220WARMZ-RL?
The AD8227ARMZ has a typical input voltage noise density of 22 nV/√Hz at 1 kHz. The AD8220WARMZ-RL has a typical input voltage noise density of 14 nV/√Hz at 1 kHz. The JFET input stage of the AD8220WARMZ-RL also provides lower current noise, making it preferable for high-impedance sources, while the AD8227ARMZ offers a balance of noise and bandwidth for lower-impedance industrial signal conditioning.