Part A
AD8479ARZ
ADI公司
- Lifecycle
- Active
- Stock
- 1516 件
- Package
- SOIC-8
- Series
- 線性放大器-儀器、運算放大器、緩衝放大器
Replacement verdict
Compatible functional replacement candidate
The AD8479ARZ and AD8479BRZ-RL are functionally interchangeable high common-mode voltage difference amplifiers sharing identical pinout, package, gain, and supply architecture, with the BRZ-RL grade offering tighter gain and offset specifications. The ARZ can serve as a direct substitute where the tighter precision of the BRZ-RL grade is not mandatory, while the BRZ-RL is a drop-in upgrade for precision-critical designs.
Package and Pinout
High match
Gain Configuration
High match
Supply Voltage Range
High match
Gain and Offset Accuracy Grade
Validation required
Parts at a glance
Part B
AD8479BRZ-RL
ADI公司
- Lifecycle
- Active
- Stock
- 5855 件
- Package
- SOIC-8
- Series
- 線性放大器-儀器、運算放大器、緩衝放大器
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8479ARZ | AD8479BRZ-RL | Why it matters |
|---|---|---|---|
| Grade / Accuracy Class | A grade | B grade | The B grade is a higher-precision bin of the same die, so it offers tighter guaranteed specs; this is the primary differentiator for substitutability in precision designs. |
| Input Offset Voltage (max) | ±1.5 mV | ±0.5 mV | Lower offset directly reduces DC error at the output; the B grade's tighter offset is critical in high-gain or precision measurement chains. |
| Input Offset Voltage Drift (max) | ±10 µV/°C | ±5 µV/°C | Drift determines offset stability over temperature; the B grade's lower drift matters for applications spanning wide temperature ranges. |
| Gain Error (max) | ±0.01% | ±0.005% | Gain error affects absolute accuracy of the amplified signal; the B grade's tighter gain spec improves overall measurement accuracy. |
| Common-Mode Rejection Ratio (min) | 90 dB | 96 dB | CMRR determines how well high common-mode voltages are rejected; the B grade's higher CMRR improves performance in high-side sensing and noisy environments. |
| Supply Voltage Range | ±4 V to ±18 V (dual) | ±4 V to ±18 V (dual) | Identical supply range means both parts are interchangeable with respect to power supply requirements. |
| Input Common-Mode Voltage Range | ±600 V | ±600 V | Both support the same very high common-mode range, enabling direct high-voltage sensing without additional isolation. |
| Operating Temperature Range | −40 °C to +125 °C | −40 °C to +125 °C | Identical temperature ratings confirm both parts are suitable for the same industrial and automotive environments. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Same package and pinout allow drop-in replacement on an existing PCB footprint. |
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-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| 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 are the key differences between the AD8479ARZ and AD8479BRZ-RL?
Both devices are identical AD8479 precision difference amplifiers from Analog Devices in an 8-lead SOIC package. The AD8479ARZ is supplied in a tube (A-grade), while the AD8479BRZ-RL is the B-grade version supplied in tape-and-reel packaging. The primary differences are the grade/performance binning and the packaging format.
Are the AD8479ARZ and AD8479BRZ-RL functionally interchangeable in a design?
Yes, both are AD8479 difference amplifiers with the same pinout and 8-lead SOIC footprint, so they are functionally interchangeable at the board level. However, the B-grade (AD8479BRZ-RL) offers tighter guaranteed specifications than the A-grade (AD8479ARZ), so the design must be validated against the grade-specific datasheet limits.
What is the difference in gain error between the A and B grades?
The AD8479ARZ (A-grade) is specified with a maximum gain error of 0.01%, while the AD8479BRZ (B-grade) is specified with a maximum gain error of 0.005%. The B-grade therefore provides tighter gain accuracy for precision applications.
How do the offset voltage specifications compare between the two grades?
The AD8479ARZ (A-grade) has a maximum input offset voltage of 1 mV, whereas the AD8479BRZ (B-grade) has a maximum input offset voltage of 0.5 mV. The B-grade offers improved DC precision.
Do the AD8479ARZ and AD8479BRZ-RL differ in common-mode voltage range?
No. Both grades of the AD8479 support a very high common-mode voltage range of ±600 V, which is a core feature of the AD8479 architecture and is common to both the A and B grades.
What packaging options distinguish the AD8479ARZ from the AD8479BRZ-RL?
The AD8479ARZ is provided in an 8-lead SOIC package in tube form, while the AD8479BRZ-RL is the same 8-lead SOIC package supplied in tape-and-reel format (the "-RL" suffix denotes reel packaging). Both share the same package outline and pin configuration.
Can the AD8479BRZ-RL be used as a drop-in replacement for the AD8479ARZ?
Yes, because both share the same 8-lead SOIC pinout and footprint, the AD8479BRZ-RL can be used as a drop-in replacement for the AD8479ARZ. The B-grade provides equal or tighter guaranteed specifications, so substituting the B-grade for the A-grade is generally acceptable, but the design should still be verified against the B-grade datasheet limits.
Which grade should be selected for a high-precision measurement application?
For high-precision applications requiring tighter gain error and lower offset voltage, the AD8479BRZ-RL (B-grade) is the preferred choice, as it guarantees 0.005% maximum gain error and 0.5 mV maximum input offset voltage versus 0.01% and 1 mV for the AD8479ARZ (A-grade).