Part A
AD8220BRMZ
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 5173 PCS
- Package
- TSSOP-8
- Series
- 선형 증폭기 - 계측기, 연산 증폭기, 완충 증폭기
Replacement verdict
Compatible functional replacement candidate
The AD8220ARMZ and AD8220BRMZ are functionally interchangeable JFET-input instrumentation amplifiers in identical 8-lead MSOP packages with the same pinout and supply range; the B-grade offers tighter gain error and offset voltage specifications, making it a valid drop-in candidate where enhanced DC precision is required, while the A-grade remains suitable for cost-sensitive designs within its specified tolerances.
Package and Pinout
High match
Supply Voltage Range
High match
Gain and Offset Accuracy Grade
Validation required
Operating Temperature Range
High match
Parts at a glance
Part B
AD8220ARMZ
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 4214 PCS
- Package
- TSSOP-8
- Series
- 선형 증폭기 - 계측기, 연산 증폭기, 완충 증폭기
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8220ARMZ | AD8220BRMZ | Why it matters |
|---|---|---|---|
| Input Offset Voltage (max) | 250 µV | 125 µV | Lower offset voltage improves DC accuracy; the B grade offers tighter precision for high-accuracy instrumentation applications. |
| Input Offset Voltage Drift (max) | 5 µV/°C | 2.5 µV/°C | Lower drift maintains accuracy over temperature; the B grade is preferable for precision measurements across wide temperature ranges. |
| Input Bias Current (max) | 25 pA | 10 pA | Lower bias current reduces error with high-impedance sources; the B grade suits higher source-impedance sensor interfaces. |
| Common-Mode Rejection Ratio (min) | 80 dB | 86 dB | Higher CMRR rejects common-mode noise and interference; the B grade provides better rejection in noisy environments. |
| Gain Error (max) | 0.1 % | 0.05 % | Lower gain error improves signal-chain accuracy; the B grade delivers tighter gain precision for critical amplification. |
| Input Voltage Noise (1 kHz) | 14 nV/√Hz | 14 nV/√Hz | Noise density affects low-level signal resolution; both grades share the same noise performance, so this is not a differentiator. |
| 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 use in both single-supply and dual-supply systems; identical for both grades. |
| Gain Bandwidth Product | 1.5 MHz | 1.5 MHz | Determines bandwidth at a given gain; identical for both grades, so frequency response is the same. |
| Package | 8-Lead MSOP | 8-Lead MSOP | Same package ensures footprint and layout compatibility; both parts are drop-in interchangeable physically. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Defines environmental limits for the application; identical for both grades. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8220BRMZ | AD8220ARMZ |
|---|---|---|
| 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 | 2V/µs |
| -3 dB Bandwidth | 1.5 MHz | 1.5 MHz |
| Current - Input Bias | 10 pA | 25 pA |
| Voltage - Input Offset | 125 µV | 250 µV |
| Supply Current | 750µA | 750µA |
| Current - Output / Channel | 15 mA | 15 mA |
| Voltage - Supply Span(Min) | 4.5 V | 4.5 V |
| Voltage - Supply Span(Max) | 36 V | 36 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the difference between the AD8220ARMZ and AD8220BRMZ?
Both are AD8220 JFET-input instrumentation amplifiers in an 8-lead MSOP package. The primary difference is the grade: the AD8220ARMZ is the A-grade version, while the AD8220BRMZ is the higher-grade B version. The B-grade offers tighter specifications, notably lower offset voltage, lower offset voltage drift, and lower input bias current, as defined in the Analog Devices datasheet.
Are the AD8220ARMZ and AD8220BRMZ pin-compatible and package-compatible?
Yes. Both devices are supplied in the same 8-lead MSOP (RM) package with identical pinout and footprint, so they are pin-to-pin and package-compatible. Electrical performance differences between the grades must still be evaluated for the target design.
What are the key specifications of the AD8220?
The AD8220 is a JFET-input instrumentation amplifier with rail-to-rail output, a gain range of 1 to 1000 set by a single resistor, and a supply range of ±2.25 V to ±18 V (4.5 V to 36 V total). It features high input impedance, low input bias current, and a typical gain bandwidth suitable for precision signal conditioning. Exact limits differ between the A and B grades and should be taken from the Analog Devices datasheet.
Which grade should be selected for precision applications?
The AD8220BRMZ is the higher-grade option and is specified with tighter offset voltage, offset drift, and input bias current than the AD8220ARMZ. For designs where DC accuracy and low drift are critical, the B-grade is generally preferred, provided its specified limits meet the system error budget.
Can the AD8220ARMZ be replaced by the AD8220BRMZ in an existing design?
Because both parts share the same package and pinout, the AD8220BRMZ can generally be used where the AD8220ARMZ was designed in, and it offers equal or better specified performance. The substitution should still be validated against the datasheet limits and the application's error budget.
What supply voltage range do the AD8220ARMZ and AD8220BRMZ support?
Both grades operate from dual supplies of ±2.25 V to ±18 V, or a single supply of 4.5 V to 36 V, per the Analog Devices datasheet. The supply range is common to both grades; the grade difference is in precision specifications rather than supply capability.
How is the gain of the AD8220ARMZ and AD8220BRMZ set?
Gain is programmed with a single external resistor connected between the RG pins, following the datasheet gain equation G = 1 + (49.4 kΩ / RG). This applies to both the A and B grades, allowing gains from 1 to 1000.
Are the AD8220ARMZ and AD8220BRMZ RoHS compliant?
Yes. The "Z" suffix in both part numbers denotes a RoHS-compliant, lead-free package per Analog Devices ordering information. Both grades are supplied in the same compliant 8-lead MSOP package.