Part A
AD637ARZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 7762 個数
- Package
- SOIC-16
- Series
- PMIC - RMS-DCコンバータ
Replacement verdict
Compatible functional replacement candidate
The AD637JRZ and AD637ARZ are functionally equivalent RMS-to-DC converters sharing the same core architecture, pinout, and package family, differing only in specified accuracy grade and temperature range. The AD637ARZ offers tighter accuracy specifications over the industrial temperature range, while the AD637JRZ provides commercial-grade accuracy. Both are viable substitutes where the application's accuracy and thermal requirements are satisfied by the selected grade.
Package Type
High match
Pin Configuration
High match
Accuracy Grade
Validation required
Operating Temperature Range
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 | AD637JRZ | AD637ARZ | Why it matters |
|---|---|---|---|
| Temperature Range (Operating) | 0°C to 70°C | -40°C to 85°C | The ARZ grade supports industrial temperature extremes, while the JRZ grade is limited to commercial temperatures; this affects suitability for harsh environments. |
| Package / Mounting | 20-Lead SOIC (R-20) | 20-Lead SOIC (R-20) | Both use the same SOIC package footprint, so board layout is interchangeable between the two grades. |
| Grade / Accuracy Class | Commercial grade (J) | Industrial grade (A) | The A grade is tested and specified over the wider industrial temperature range, giving tighter guaranteed accuracy across temperature. |
| Function | RMS-to-DC converter | RMS-to-DC converter | Both perform true RMS-to-DC conversion, so the core signal-processing function is identical. |
| Supply Voltage | ±3 V to ±18 V (dual supply) | ±3 V to ±18 V (dual supply) | Identical supply range means the same power rails can be used for either part. |
| Bandwidth | 8 MHz (at 200 mV rms) | 8 MHz (at 200 mV rms) | Matching bandwidth ensures equivalent AC measurement capability for both parts. |
| Input Signal Range | 0 to 7 V rms (with ±15 V supplies) | 0 to 7 V rms (with ±15 V supplies) | Same input range means both handle the same signal amplitudes without external attenuation. |
| Quiescent Current | 2.2 mA (typical) | 2.2 mA (typical) | Identical power consumption supports drop-in replacement in power-sensitive designs. |
| Output Type | Voltage output (buffered) | Voltage output (buffered) | Both provide a buffered voltage output, so downstream interface circuitry remains the same. |
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 | AD637ARZ | AD637JRZ |
|---|---|---|
| Part Status | Active | Active |
| Supply Current | 2.2 mA | 2.2 mA |
| Voltage - Supply | ±3V ~ 18V | ±3V ~ 18V |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary differences between the AD637JRZ and AD637ARZ?
Both devices are RMS-to-DC converters from Analog Devices in a 16-lead SOIC package. The main difference is the specified temperature range and corresponding grade: the AD637JRZ is specified for 0°C to 70°C (commercial grade), while the AD637ARZ is specified for −40°C to +85°C (industrial grade).
Are the AD637JRZ and AD637ARZ functionally identical?
Yes. Both are AD637-series high-accuracy RMS-to-DC converters offering the same core function: computing the true RMS value of complex AC waveforms. They share the same functional block diagram and pinout in the 16-lead SOIC package; the difference is the temperature grade and associated specification limits.
Can the AD637JRZ be used as a drop-in replacement for the AD637ARZ?
They are pin-compatible in the same 16-lead SOIC package, but substitution should only be made after verifying that the commercial temperature range (0°C to 70°C) of the AD637JRZ meets the application's operating environment. The AD637ARZ's wider −40°C to +85°C range is required where industrial temperature extremes apply.
What package do the AD637JRZ and AD637ARZ use?
Both parts are supplied in a 16-lead SOIC package (R-16 suffix in the ordering code), making them suitable for surface-mount assembly with identical PCB land patterns.
Which grade should be selected for industrial temperature environments?
The AD637ARZ should be selected for industrial environments, as it is specified over −40°C to +85°C. The AD637JRZ is limited to the 0°C to 70°C commercial range and is not specified for operation outside that range.
Do both parts provide the same RMS-to-DC conversion function?
Yes. Both are true RMS-to-DC converters that compute the RMS value of input waveforms, supporting measurement of complex signals. Selection between them is based on temperature grade and specification limits rather than conversion function.
Are the AD637JRZ and AD637ARZ RoHS compliant?
Both ordering codes carry the "Z" suffix, which in Analog Devices nomenclature denotes RoHS-compliant, lead-free (Pb-free) packaging. Designers should confirm current compliance status against the latest manufacturer datasheet and product page before finalizing a design.