Part A
AD8479ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1516 PCS
- Package
- SOIC-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8479ARZ and AD8479BRZ are functionally interchangeable precision difference amplifiers sharing identical pinout, package, supply range, and gain configuration; the BRZ grade offers tighter gain and offset accuracy for applications where enhanced DC precision is required, while the ARZ grade remains suitable for less demanding tolerance budgets.
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
AD8479BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1818 PCS
- Package
- SOIC-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8479BRZ | AD8479ARZ | Why it matters |
|---|---|---|---|
| Gain Error (max) | 0.01% | 0.02% | Lower gain error improves DC accuracy of the difference amplifier in precision measurement applications. |
| Input Offset Voltage (max) | ±200 µV | ±400 µV | Offset voltage directly adds to measurement error; a lower offset enables more accurate signal conditioning. |
| Input Offset Voltage Drift (max) | ±5 µV/°C | ±10 µV/°C | Drift determines offset stability over temperature, critical for systems operating across wide temperature ranges. |
| CMRR (min, DC) | 90 dB | 86 dB | Higher common-mode rejection improves accuracy when measuring small differential signals on large common-mode voltages. |
| Operating Temperature Range | −40°C to +125°C | −40°C to +85°C | The wider temperature range of the B grade supports industrial and automotive applications requiring high-temperature operation. |
| Supply Voltage Range | ±2.5 V to ±18 V | ±2.5 V to ±18 V | Identical supply range means both parts are interchangeable for power supply design considerations. |
| Gain | 1 V/V | 1 V/V | Unity gain ensures the same signal scaling in the application, allowing direct functional substitution. |
| Input Common-Mode Voltage Range | ±600 V | ±600 V | High common-mode range is the key feature of this difference amplifier; identical range preserves high-voltage measurement capability. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Same package footprint allows drop-in replacement on existing PCB layouts. |
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 | AD8479ARZ | AD8479BRZ |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | General Purpose | General Purpose |
| Number of Circuits | 1 | 1 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 8V/µs | 8V/µs |
| -3 dB Bandwidth | 130 kHz | 130 kHz |
| Voltage - Input Offset | 500 µV | 500 µV |
| Supply Current | 550µA | 550µA |
| Current - Output / Channel | 55 mA | 55 mA |
| Voltage - Supply Span(Min) | 5 V | 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 is the main difference between the AD8479BRZ and AD8479ARZ?
The primary difference is the grade and specified performance. The AD8479BRZ is the higher-grade version with tighter guaranteed specifications, while the AD8479ARZ is the standard grade. Both are precision high common-mode voltage difference amplifiers in an 8-lead SOIC package, but the B-grade offers better accuracy limits as defined in the Analog Devices datasheet.
Are the AD8479BRZ and AD8479ARZ pin-compatible and package-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with identical pin functions, so they are pin-to-pin and footprint compatible. This allows a board designed for one grade to accept the other without layout changes.
Do the AD8479BRZ and AD8479ARZ share the same functional specifications?
Yes. Both are unity-gain difference amplifiers with a very high common-mode voltage range of ±600 V, a fixed gain of 1, and the same nominal supply and input architecture. The functional behavior is the same; the grades differ in guaranteed accuracy limits such as offset voltage, gain error, and common-mode rejection ratio over temperature.
Which grade should be selected for a precision measurement design?
The AD8479BRZ is the appropriate choice when tighter guaranteed limits on offset voltage, gain error, and common-mode rejection are required over the operating temperature range. The AD8479ARZ is suitable where the standard-grade limits are sufficient. Selection should be based on the error budget and the guaranteed limits stated in the Analog Devices datasheet for each grade.
Are the AD8479BRZ and AD8479ARZ interchangeable in an existing design?
Because they are pin-compatible and functionally identical, the AD8479ARZ can generally be used where an AD8479BRZ was specified only if the standard-grade accuracy limits satisfy the design's error budget. Conversely, substituting the B-grade for the A-grade is acceptable from a functional standpoint. Any substitution should be validated against the guaranteed specifications in the manufacturer datasheet.
Do both grades operate over the same temperature range?
Both the AD8479BRZ and AD8479ARZ are specified for the industrial temperature range of −40°C to +125°C, as stated in the Analog Devices datasheet. The difference between grades is in the guaranteed performance limits over that range, not in the operating temperature range itself.
What common-mode voltage range do the AD8479BRZ and AD8479ARZ support?
Both devices support a very high common-mode input voltage range of ±600 V, which is the defining feature of the AD8479 family. This allows them to be used in high-voltage current-sensing and monitoring applications where the common-mode voltage greatly exceeds the supply rails.