Part A
AD623ARZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4377 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD623BR-REEL7 is a higher-grade variant of the AD623ARZ instrumentation amplifier, sharing the same functional architecture, pinout, and package while offering tighter gain accuracy and lower offset voltage. Both parts are functionally interchangeable in most designs, with the BR grade providing improved precision specifications that may reduce or eliminate calibration requirements in gain-critical applications.
Package Type
High match
Pin Configuration
High match
Gain Accuracy Grade
Validation required
Input Offset Voltage
Validation required
Parts at a glance
Part B
AD623BR-REEL7
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2030 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Instrumentation, 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 | AD623ARZ | AD623BR-REEL7 | Why it matters |
|---|---|---|---|
| Input Offset Voltage (max) | 200 µV | 100 µV | Lower offset voltage improves DC accuracy; the B grade offers tighter offset for precision measurement applications. |
| Input Offset Voltage Drift (max) | 2 µV/°C | 1 µV/°C | Lower drift maintains accuracy over temperature; the B grade is preferable for wide-temperature precision designs. |
| Input Bias Current (max) | 25 nA | 25 nA | Bias current affects error with high source impedance; both grades are specified identically here. |
| Gain Error (max, G=1) | 0.10% | 0.05% | Gain error directly impacts signal scaling accuracy; the B grade provides tighter gain accuracy. |
| Gain Nonlinearity (max, G=1 to 1000) | 50 ppm | 25 ppm | Nonlinearity limits accuracy across the gain range; the B grade offers better linearity for precision instrumentation. |
| CMRR (min, G=10) | 90 dB | 100 dB | Higher common-mode rejection improves performance in noisy environments; the B grade rejects common-mode signals better. |
| Input Voltage Noise (1 kHz) | 35 nV/√Hz | 35 nV/√Hz | Noise floor affects resolution of small signals; both grades share the same noise specification. |
| Supply Voltage Range | 2.7 V to 12 V | 2.7 V to 12 V | Determines compatibility with single-supply and battery-powered systems; both grades support the same range. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Defines environmental limits for the application; both grades are rated for the same industrial range. |
| Package / Mounting | 8-Lead SOIC (tube) | 8-Lead SOIC (tape and reel) | Packaging affects assembly handling; the B grade is supplied on reel for automated production lines. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD623ARZ | AD623BR-REEL7 |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Obsolete |
| Amplifier Type | Instrumentation | Instrumentation |
| Number of Circuits | 1 | 1 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 0.3V/µs | 0.3V/µs |
| -3 dB Bandwidth | 800 kHz | 800 kHz |
| Current - Input Bias | 17 nA | 17 nA |
| Voltage - Input Offset | 25 µV | 25 µV |
| Supply Current | 375µA | 375µA |
| Voltage - Supply Span(Min) | 2.7 V | 2.7 V |
| Voltage - Supply Span(Max) | 12 V | 12 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AD623ARZ and AD623BR-REEL7?
Both are instrumentation amplifiers from the AD623 family in an 8-lead SOIC package. The AD623ARZ is supplied in tube packaging and is specified with a gain error of 0.35% max (G=1) and 0.5% max (G=1000), while the AD623BR-REEL7 is the higher-grade B version supplied on a 7-inch reel, specified with tighter gain error of 0.25% max (G=1) and 0.35% max (G=1000). The B grade also offers tighter offset voltage and offset voltage drift specifications than the A grade.
Are the AD623ARZ and AD623BR-REEL7 pin-compatible and functionally interchangeable?
Yes. Both devices are the AD623 instrumentation amplifier in the same 8-lead SOIC (R-8) package with identical pinout and the same external gain-setting resistor configuration. They are functionally interchangeable in the same PCB footprint, but the AD623BR-REEL7 provides tighter guaranteed specifications, so a design that requires the B-grade limits should not be downgraded to the A grade without verifying performance.
What is the gain-setting method for both parts?
Both the AD623ARZ and AD623BR-REEL7 set gain with a single external resistor between the RG pins (pins 1 and 8). Gain is G = 1 + (100 kΩ / RG). With RG unconnected, the gain defaults to 1. The same resistor value produces the same nominal gain on both grades; only the guaranteed gain accuracy differs.
Do the AD623ARZ and AD623BR-REEL7 have the same supply voltage range and quiescent current?
Yes. Both operate from a single supply of 2.7 V to 12 V or dual supplies of ±2.5 V to ±6 V, and both draw a typical supply current of 375 µA (575 µA max). These supply specifications are common to the AD623 family and do not differ between the A and B grades.
How do the offset voltage specifications compare between the two grades?
The AD623BR-REEL7 (B grade) is specified with a lower maximum input offset voltage than the AD623ARZ (A grade). The B grade is the tighter-bin version of the same die, so designs sensitive to DC offset should use the B grade. Refer to the official AD623 datasheet for the exact grade-specific offset voltage and drift limits.
What does the REEL7 suffix mean on the AD623BR-REEL7?
The REEL7 suffix indicates the device is supplied on a 7-inch tape-and-reel carrier for automated pick-and-place assembly, typically 750 pieces per reel for the 8-lead SOIC. The AD623ARZ without a reel suffix is supplied in tube packaging. The electrical grade is determined by the A or B letter, not by the packaging suffix.
Can the AD623ARZ be used as a drop-in replacement for the AD623BR-REEL7 in an existing design?
Physically and functionally yes, since both share the same package, pinout, and gain equation. However, the AD623ARZ has wider guaranteed tolerances (gain error, offset voltage, and offset drift) than the AD623BR-REEL7. A drop-in substitution is acceptable only if the design's error budget is validated against the A-grade limits from the AD623 datasheet.
Are both parts specified over the same temperature range?
Yes. Both the AD623ARZ and AD623BR-REEL7 are specified for the industrial temperature range of −40°C to +85°C. The difference between the grades is in guaranteed accuracy parameters, not in the operating temperature range.