Part A
AD737JRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7410 PCS
- Package
- SOIC-8
- Series
- PMIC - RMS para DC Converters
Replacement verdict
Compatible functional replacement candidate
The AD737JRZ and AD737AR are functionally equivalent RMS-to-DC converters sharing the same core architecture, pinout, and operating principle, making them viable substitutes in most designs. The primary distinction lies in package and temperature-grade options, so the AD737AR should be validated against the target application's thermal and mechanical requirements before substitution.
Function and Topology
High match
Pin Configuration
High match
Package Type
Validation required
Operating Temperature Range
Validation required
Parts at a glance
Part B
AD737AR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8952 PCS
- Package
- SOIC-8
- Series
- PMIC - RMS para DC Converters
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD737JRZ | AD737AR | Why it matters |
|---|---|---|---|
| Package / Mounting Type | 8-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount) | Package style determines board footprint and assembly method; both are SOIC so they are physically interchangeable on the same land pattern. |
| Operating Temperature Range | 0°C to +70°C | -40°C to +85°C | The industrial-grade temperature range of the AR version allows operation in harsher environments where the commercial-grade JRZ version may not be specified. |
| Grade / Temperature Class | Commercial (J grade) | Industrial (A grade) | The grade suffix indicates tested performance over temperature; the A grade is qualified over a wider range, affecting reliability in industrial applications. |
| Supply Voltage Range | ±2.5 V to ±16.5 V (dual supply) | ±2.5 V to ±16.5 V (dual supply) | Both parts accept the same dual-supply range, so power supply design does not need to change when substituting one for the other. |
| Supply Current | ~160 µA typical | ~160 µA typical | Low quiescent current is critical for battery-powered true RMS measurement; identical current draw means no impact on power budget. |
| Function | True RMS-to-DC converter | True RMS-to-DC converter | Both devices perform the same core signal-processing function, making them functionally substitutable in RMS measurement circuits. |
| Bandwidth | ~190 kHz (at 1 V rms) | ~190 kHz (at 1 V rms) | Sufficient bandwidth ensures accurate RMS conversion of AC signals up to the specified frequency; matching bandwidth means equivalent AC measurement capability. |
| Total Error | ±0.5% of reading (typical) | ±0.5% of reading (typical) | RMS conversion accuracy directly affects measurement precision; identical error specs mean no recalibration is needed when swapping parts. |
| RoHS Compliance | RoHS compliant (Z suffix) | RoHS compliant | RoHS compliance is required for products sold in regulated markets; both parts meet the directive, so environmental compliance is preserved. |
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 | AD737JRZ | AD737AR |
|---|---|---|
| Part Status | Active | Obsolete |
| Supply Current | 170 µA | 170 mA |
| Voltage - Supply | 2.8V, -3.2V ~ ±16.5V | ±5.0V |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary differences between the AD737JRZ and the AD737AR?
The AD737JRZ and AD737AR are both RMS-to-DC converters from Analog Devices, but they differ in package type and temperature grade. The AD737JRZ is supplied in a 16-lead SOIC package (R-16) and is specified for the commercial temperature range of 0°C to +70°C. The AD737AR is supplied in a 14-lead SOIC package (R-14) and is specified for the industrial temperature range of −40°C to +85°C. Both parts share the same core RMS-to-DC conversion architecture and electrical performance characteristics.
Are the AD737JRZ and AD737AR electrically identical in function?
Yes. Both devices are true RMS-to-DC converters that compute the RMS value of an input signal using a logarithmic-antilogarithmic computational technique. They provide the same fundamental function: converting an AC input signal to a DC output proportional to its RMS value. The core signal processing, input range, and output scaling are the same across both variants; the differences are limited to package and temperature grade.
Can the AD737JRZ and AD737AR be used interchangeably in a design?
They are not pin-for-pin or package-for-package interchangeable. The AD737JRZ uses a 16-lead SOIC package, while the AD737AR uses a 14-lead SOIC package. The PCB land patterns and pin counts differ, so a direct drop-in replacement is not possible without a board redesign. Additionally, the temperature grade differs: the AD737JRZ is rated for 0°C to +70°C, while the AD737AR is rated for −40°C to +85°C. Designers must verify package footprint and operating temperature requirements before substituting one for the other.
What is the operating temperature range for each part?
The AD737JRZ is specified over the commercial temperature range of 0°C to +70°C. The AD737AR is specified over the industrial temperature range of −40°C to +85°C. For applications requiring operation below 0°C or above +70°C, the AD737AR is the appropriate choice based on its published temperature specification.
What package types do the AD737JRZ and AD737AR use?
The AD737JRZ is offered in a 16-lead SOIC package. The AD737AR is offered in a 14-lead SOIC package. Both are surface-mount SOIC packages, but the lead count and body width differ, which affects PCB layout and land pattern design.
Do both parts support the same input signal range and supply voltage?
Both the AD737JRZ and AD737AR are designed to operate from a single supply or dual supplies within the specified supply voltage range published in the Analog Devices AD737 datasheet. They share the same input voltage range and output scaling characteristics as defined by the common AD737 core. Designers should consult the official AD737 datasheet for the exact specified limits, as these parameters are common to both package variants.
Which part should be selected for industrial or extended-temperature applications?
The AD737AR should be selected for industrial or extended-temperature applications because it is specified over the −40°C to +85°C range. The AD737JRZ is limited to the commercial 0°C to +70°C range and is not specified for operation outside that window. Selection should be based on the verified temperature grade required by the application.