Part A
AD737JRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7410 Stückzahl
- Package
- SOIC-8
- Series
- PMIC-Konverter von RmRMS zu DC
Replacement verdict
Compatible functional replacement candidate
The AD737JRZ and AD737KR are functionally equivalent true RMS-to-DC converters sharing the same core architecture, pinout, and package family, making the AD737JRZ a viable functional replacement candidate for the AD737KR in most RMS measurement applications. The primary distinction lies in the specified accuracy grade, so designers should validate the error budget against the target application before substituting one grade for the other.
Function and Topology
High match
Package and Pinout
High match
Accuracy Grade
Validation required
Supply and Temperature Range
High match
Parts at a glance
Part B
AD737KR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 429 Stückzahl
- Package
- SOIC-8
- Series
- PMIC-Konverter von RmRMS zu DC
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 | AD737KR | Why it matters |
|---|---|---|---|
| Package / Mounting Type | 8-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount) | Package and mounting style determine PCB footprint and assembly compatibility; both are SOIC so they are drop-in compatible. |
| Operating Temperature Range | 0°C to +70°C | 0°C to +70°C | The temperature range defines the environments in which the part can reliably operate; identical ranges mean equivalent environmental suitability. |
| Supply Voltage Range | ±2.5 V to ±16.5 V (dual supply) | ±2.5 V to ±16.5 V (dual supply) | Supply range must match the system rails; identical ranges ensure the parts are interchangeable in the same circuit. |
| Supply Current | ~160 µA typical | ~160 µA typical | Quiescent current affects power budget; matching values confirm equivalent power consumption. |
| Accuracy / Total Error | ±0.3% of reading (typical) | ±0.3% of reading (typical) | Accuracy grade determines measurement precision; identical accuracy means equivalent performance in RMS-to-DC conversion. |
| Bandwidth | ~190 kHz (typical) | ~190 kHz (typical) | Bandwidth limits the maximum signal frequency the converter can accurately process; matching values ensure equivalent frequency response. |
| Input Voltage Range | ±0.2 V to ±1 V (full scale) | ±0.2 V to ±1 V (full scale) | Input range defines the signal amplitude the device can handle without clipping; identical ranges ensure interchangeable signal handling. |
| Output Type | DC voltage proportional to RMS input | DC voltage proportional to RMS input | Output format must match the downstream ADC or measurement stage; identical output types confirm functional substitutability. |
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 | AD737KR |
|---|---|---|
| Part Status | Active | Obsolete |
| Supply Current | 170 µA | 170 mA |
| Voltage - Supply | 2.8V, -3.2V ~ ±16.5V | ±2.5V ~ 16.5V |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the main differences between the AD737JRZ and AD737KR?
Both devices are RMS-to-DC converters from Analog Devices in an 8-lead SOIC package. The primary difference is the specified accuracy grade: the AD737JRZ is the standard grade with a typical total error specification, while the AD737KR is the higher-accuracy grade with tighter maximum error limits over the operating temperature range. The AD737KR also carries a higher price tier reflecting its tighter tested specifications.
Are the AD737JRZ and AD737KR pin-compatible?
Yes. Both parts are offered in the same 8-lead SOIC (R-8) package with identical pin assignments, so they are pin-compatible and can share the same PCB footprint.
Can the AD737JRZ be used as a drop-in replacement for the AD737KR?
Functionally the devices are interchangeable because they share the same die, pinout, and package. However, substituting the standard-grade AD737JRZ for the higher-grade AD737KR will relax the guaranteed accuracy limits. The substitution should only be made after confirming that the wider error tolerance of the AD737JRZ is acceptable for the application.
What is the operating temperature range for both grades?
Both the AD737JRZ and AD737KR are specified for the commercial temperature range of 0°C to +70°C. The J and K suffixes denote the accuracy grade, not the temperature range.
Do both parts require the same external components?
Yes. Both grades use the same external averaging capacitor and input coupling capacitor configuration. The datasheet application circuits, including the recommended capacitor values for a given averaging time constant, apply equally to the AD737JRZ and AD737KR.
What supply voltage do the AD737JRZ and AD737KR require?
Both devices operate from a single supply of 2.8 V to 16.5 V, or from dual supplies of ±2.8 V to ±16.5 V, as specified in the Analog Devices AD737 datasheet. The supply requirements are identical for both grades.
Which grade should be selected for a precision measurement design?
For designs where RMS measurement accuracy over temperature is critical, the AD737KR is the appropriate choice because its tighter maximum error limits are guaranteed by test. The AD737JRZ is suitable for cost-sensitive applications where the standard-grade error budget is acceptable.