Part A
AD620AR
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 2454 個数
- Package
- SOIC-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 AD620BRZ-R7 and AD620AR are functionally compatible instrumentation amplifiers sharing the same core architecture, pinout, and gain equation, making the BRZ-R7 a viable replacement candidate for the AR grade in most designs. The primary distinction lies in grade-level precision: the BRZ-R7 offers tighter gain error, lower offset voltage, and reduced drift, while the AR grade provides wider guaranteed operating temperature range. Designers should validate thermal margin and precision requirements against the target application before substituting.
Package Type
High match
Pin Configuration
High match
Operating Temperature Range
Validation required
Gain Error and Offset Voltage Grade
High match
Parts at a glance
Part B
AD620BRZ-R7
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 2808 個数
- Package
- SOIC-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 | AD620BRZ-R7 | AD620AR | Why it matters |
|---|---|---|---|
| Grade / Accuracy Class | B grade (higher precision) | A grade (standard precision) | The B grade offers tighter gain and offset specifications, so it is preferred where measurement accuracy is critical; the A grade is adequate for less demanding applications. |
| Input Offset Voltage (max) | 50 µV | 125 µV | Lower input offset voltage reduces DC error at the output, which is important for precision low-level signal amplification. |
| Input Offset Voltage Drift (max) | 0.6 µV/°C | 1.0 µV/°C | Lower drift maintains accuracy over temperature; the B grade is more stable in wide-temperature environments. |
| Input Bias Current (max) | 1.0 nA | 2.0 nA | Lower bias current reduces errors in high-impedance source applications, favoring the B grade for such designs. |
| Gain Error (max, G=1000) | 0.15% | 0.5% | Tighter gain error improves absolute gain accuracy, which matters for calibrated instrumentation systems. |
| CMRR (min, G=1000) | 120 dB | 110 dB | Higher common-mode rejection suppresses interference and noise, improving signal fidelity in noisy environments. |
| Noise (0.1–10 Hz, RTI) | 0.28 µV p-p | 0.55 µV p-p | Lower low-frequency noise benefits precision DC and low-frequency measurements, favoring the B grade. |
| Supply Voltage Range | ±2.3 V to ±18 V | ±2.3 V to ±18 V | Identical supply range means both parts are interchangeable for power-supply compatibility. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Same package footprint allows direct board-level substitution without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature range ensures both parts suit the same environmental conditions. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD620AR | AD620BRZ-R7 |
|---|---|---|
| Part Status | Obsolete | Active |
| Amplifier Type | Instrumentation | Instrumentation |
| Number of Circuits | 1 | 1 |
| Slew Rate | 1.2V/µs | 1.2V/µs |
| -3 dB Bandwidth | 1 MHz | 1 MHz |
| Current - Input Bias | 500 pA | 500 pA |
| Voltage - Input Offset | 30 µV | 15 µV |
| Supply Current | 900µA | 900µA |
| Current - Output / Channel | 18 mA | 18 mA |
| Voltage - Supply Span(Min) | 4.6 V | 4.6 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 are the main differences between the AD620BRZ-R7 and the AD620AR?
The AD620BRZ-R7 is the B-grade version supplied in a 7-inch reel (R7) in an SOIC-8 package (RZ), while the AD620AR is the A-grade version in an 8-lead SOIC package supplied in tubes. The B grade offers tighter guaranteed specifications than the A grade, notably lower input offset voltage (50 µV max vs 125 µV max), lower input offset drift (0.6 µV/°C max vs 1.0 µV/°C max), lower input bias current (1.0 nA max vs 2.0 nA max), and higher CMRR (100 dB min vs 93 dB min at G=10).
Are the AD620BRZ-R7 and AD620AR functionally interchangeable in an existing design?
Yes, both are AD620 instrumentation amplifiers in the same 8-lead SOIC package with identical pinouts and the same gain equation (G = 49.4 kΩ/RG + 1). The AD620BRZ-R7 is a higher-grade selection of the same device, so it can generally replace the AD620AR where the tighter specifications are acceptable, but the reverse substitution (A grade replacing B grade) may violate performance requirements. Always verify grade-specific limits against the datasheet for the target design.
What is the gain range and gain-setting method for these devices?
Both the AD620BRZ-R7 and AD620AR set gain with a single external resistor RG connected between pins 1 and 8, using the relationship G = 49.4 kΩ/RG + 1. Gains from 1 to 10,000 are achievable; G = 1 is obtained by leaving RG open. The gain accuracy depends on the grade and RG tolerance, so the B grade provides tighter guaranteed gain error than the A grade.
How do the input offset voltage and drift specifications compare between the two grades?
The AD620BRZ-R7 (B grade) guarantees a maximum input offset voltage of 50 µV and a maximum offset voltage drift of 0.6 µV/°C. The AD620AR (A grade) guarantees a maximum input offset voltage of 125 µV and a maximum drift of 1.0 µV/°C. These differences matter in low-level signal conditioning where offset and drift dominate the error budget.
Do the AD620BRZ-R7 and AD620AR differ in supply voltage range or quiescent current?
No. Both grades operate from dual supplies of ±2.3 V to ±18 V (or equivalent single-supply arrangements within that total range) and draw a maximum supply current of 1.3 mA. The supply-related specifications are common to the AD620 family and do not differ between the A and B grades.
What are the packaging and ordering differences between the AD620BRZ-R7 and AD620AR?
The AD620BRZ-R7 is supplied in a 7-inch tape-and-reel (R7 suffix) for automated assembly, in the RoHS-compliant SOIC-8 (RZ) package. The AD620AR is supplied in the 8-lead SOIC package in tube form. Both use the same SOIC-8 body and pinout, so PCB land patterns are identical; only the shipping format and grade differ.
Which grade should be selected for precision low-level sensor applications?
For precision applications with small sensor signals, the AD620BRZ-R7 is the preferred choice because its tighter offset voltage, offset drift, input bias current, and CMRR limits reduce total measurement error. The AD620AR remains suitable for less demanding applications where the wider A-grade limits are acceptable and cost is the primary consideration.