Part A
AD694ARZ-REEL
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4477 ПКС
- Package
- SOIC-16
- Series
- Интерфейс - интерфейсы датчиков и детекторов
Replacement verdict
Compatible functional replacement candidate
The AD694ARZ-REEL and AD694BR are functionally compatible voltage-to-current transmitters sharing the same pinout, supply range, and output configuration, with the AD694BR offering tighter guaranteed accuracy specifications. Both are viable substitutes in most designs, though applications requiring the AD694BR's enhanced precision grades should validate the ARZ-REEL variant against their accuracy budget.
Output Type
High match
Package Type
High match
Supply Voltage Range
High match
Accuracy Grade
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD694ARZ-REEL | AD694BR | Why it matters |
|---|---|---|---|
| Package / Mounting | 16-Lead SOIC (surface mount, reel) | 16-Lead SOIC (surface mount, tube) | Both are SOIC-16, but the reel vs. tube packaging affects assembly line handling and order quantities, not electrical function. |
| Grade / Accuracy Class | A grade | B grade | The B grade is a higher-precision grade than the A grade, so total output error and drift specifications differ, affecting measurement accuracy in the end application. |
| Total Output Error (max) | ±0.25% FS (A grade) | ±0.1% FS (B grade) | Directly determines the worst-case accuracy of the 4–20 mA output; the B grade offers tighter accuracy for precision loops. |
| Output Error Drift (max) | Higher drift (A grade) | Lower drift (B grade) | Drift over temperature affects long-term stability of the current loop; the B grade is specified tighter for temperature-sensitive applications. |
| Output Current Range | 4–20 mA (also 0–20 mA selectable) | 4–20 mA (also 0–20 mA selectable) | Defines the standard industrial current-loop output; identical range means both are functionally interchangeable for loop signaling. |
| Supply Voltage Range | +4.5 V to +36 V | +4.5 V to +36 V | Determines compatibility with the system power rail; identical range means either part works in the same supply design. |
| Input Signal Range | 0 V to 2 V (or 0–10 V via divider) | 0 V to 2 V (or 0–10 V via divider) | Sets the sensor/voltage input span the transmitter accepts; identical input range preserves signal-chain compatibility. |
| Operating Temperature Range | −40 °C to +85 °C | −40 °C to +85 °C | Confirms both parts are rated for industrial temperature environments; identical range means no derating difference. |
| Function / Device Type | Voltage-to-current transmitter (4–20 mA) | Voltage-to-current transmitter (4–20 mA) | Confirms both are the same functional device, so substitution is possible with attention to grade-level accuracy differences. |
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 | AD694ARZ-REEL | AD694BR |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Type | Current Transmitter | Current Transmitter |
| Input Type | Voltage | Voltage |
| Output Type | Voltage | Voltage |
| Supply Current | 23 mA | 23 mA |
| 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 AD694ARZ-REEL and the AD694BR?
The AD694ARZ-REEL and AD694BR are both 4-20 mA output transmitters from Analog Devices, but they differ in accuracy grade and packaging. The AD694ARZ-REEL is the A-grade version supplied in a 16-lead SOIC package and delivered on tape and reel for automated assembly. The AD694BR is the B-grade version, which offers tighter guaranteed specifications, including lower nonlinearity and improved accuracy over the A-grade. Both share the same functional architecture and pinout in their respective packages.
Are the AD694ARZ-REEL and AD694BR functionally interchangeable?
Functionally, both devices perform the same 4-20 mA voltage-to-current conversion and share the same internal architecture. However, they are not drop-in replacements for each other without verification because the AD694ARZ-REEL is supplied in a 16-lead SOIC package while the AD694BR is offered in a 16-lead PDIP package. The differing package footprints and the tighter B-grade accuracy specifications must be validated against the target design before substitution.
What accuracy grade does the AD694BR offer compared to the AD694ARZ-REEL?
The AD694BR is the higher-grade B version, which guarantees tighter specifications than the A-grade AD694ARZ-REEL. The B-grade provides improved nonlinearity and overall accuracy, making it preferable for precision 4-20 mA loop applications. Designers should consult the official Analog Devices AD694 datasheet for the exact guaranteed limits of each grade before selecting a part.
What package and packaging options do these two parts use?
The AD694ARZ-REEL is supplied in a 16-lead SOIC package and is delivered on tape and reel, which suits high-volume automated pick-and-place assembly. The AD694BR is supplied in a 16-lead PDIP package, typically intended for through-hole mounting and prototyping or low-volume production. The package choice affects PCB land pattern, assembly method, and thermal considerations.
What is the primary function of the AD694 series in signal conditioning?
The AD694 is a monolithic voltage-to-current converter designed to generate a standard 4-20 mA output current proportional to an input voltage. It is commonly used in industrial process control, sensor transmitters, and loop-powered instrumentation where a robust current-loop signal is required. Both the AD694ARZ-REEL and AD694BR provide this same core function.
Which part should be selected for a precision industrial transmitter design?
For applications requiring tighter guaranteed accuracy and lower nonlinearity, the AD694BR B-grade is the appropriate choice. For cost-sensitive designs where the A-grade specifications are sufficient, the AD694ARZ-REEL offers the same function in a surface-mount SOIC package on tape and reel. Selection should be based on the accuracy budget and assembly requirements of the specific design, verified against the manufacturer datasheet.