Part A
AD637JRZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6367 ПКС
- Package
- SOIC-16
- Series
- PMIC - Преобразователи RMS в DC
Replacement verdict
Compatible functional replacement candidate
The AD637JRZ is a functionally compatible replacement candidate for the AD637BRZ, sharing identical core RMS-to-DC conversion architecture, pinout, and package. The primary distinction is the grade-level accuracy specification, where the BRZ offers tighter guaranteed linearity and accuracy over temperature. Designers should validate that the relaxed accuracy tolerances of the JRZ grade satisfy the application's measurement error budget before substituting in precision instrumentation designs.
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 | AD637BRZ | AD637JRZ | Why it matters |
|---|---|---|---|
| Grade / Accuracy Grade | B grade (higher accuracy) | J grade (standard accuracy) | The B grade offers tighter accuracy specifications than the J grade, which directly affects measurement precision in RMS-to-DC conversion applications. |
| Total Error (RMS/DC Conversion) | ±0.5% max (B grade) | ±1.0% max (J grade) | Total error determines the worst-case accuracy of the RMS computation; the B grade provides roughly twice the accuracy of the J grade. |
| Operating Temperature Range | -40°C to +85°C (industrial) | 0°C to +70°C (commercial) | The wider industrial temperature range of the B grade allows operation in harsher environments where the commercial J grade may not be specified. |
| Package / Mounting | 20-Lead SOIC (R-20) | 20-Lead SOIC (R-20) | Both share the same SOIC package footprint, so they are physically interchangeable on a PCB despite grade differences. |
| Supply Voltage Range | ±3 V to ±18 V (dual supply) | ±3 V to ±18 V (dual supply) | Identical supply requirements mean either grade can be used in the same power rail design without modification. |
| Input Signal Bandwidth | Up to 8 MHz (typical) | Up to 8 MHz (typical) | The RMS converter bandwidth is the same for both grades, so AC signal handling capability is equivalent. |
| Quiescent Supply Current | ~2.2 mA (typical) | ~2.2 mA (typical) | Power consumption is essentially identical, so thermal and supply budgeting are unaffected by grade choice. |
| Output Offset Voltage | Lower offset (B grade trimmed) | Higher offset (J grade) | Lower output offset in the B grade improves DC accuracy and reduces the need for external offset trimming in precision designs. |
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 | AD637JRZ | AD637BRZ |
|---|---|---|
| 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 is the primary difference between the AD637BRZ and AD637JRZ?
The main difference is the specified accuracy grade and temperature range. The AD637BRZ is the higher-grade version with tighter accuracy specifications and is specified over the extended industrial temperature range of −40°C to +85°C. The AD637JRZ is the commercial-grade version with wider accuracy tolerances and is specified over 0°C to +70°C.
Are the AD637BRZ and AD637JRZ pin-compatible and package-compatible?
Yes. Both devices are offered in the same 16-lead SOIC package (RZ suffix) with identical pin functions, so they are pin-compatible and share the same PCB land pattern. The difference lies in the grade and temperature specification, not the package or pinout.
What function does the AD637 family provide?
The AD637 is a complete, high-accuracy RMS-to-DC converter that computes the true root-mean-square value of complex AC and DC input waveforms. It provides a DC output proportional to the RMS value and is used in instrumentation, power measurement, and signal-processing applications.
Can the AD637JRZ be used as a drop-in replacement for the AD637BRZ?
Electrically and mechanically they are interchangeable in the same socket, but the substitution is only acceptable if the application's accuracy budget and operating temperature range are satisfied by the commercial-grade AD637JRZ specifications. Designs requiring the tighter accuracy or the −40°C to +85°C range must retain the AD637BRZ.
What supply voltage does the AD637BRZ and AD637JRZ require?
Both devices operate from dual supplies of ±3 V to ±18 V, allowing use in both battery-powered and standard ±15 V analog systems. The supply requirement is identical for both grades.
Do the AD637BRZ and AD637JRZ differ in bandwidth or RMS conversion performance?
The functional bandwidth and RMS conversion architecture are the same for both grades. The grade distinction is accuracy and temperature specification, not the fundamental conversion topology or rated bandwidth. Consult the manufacturer datasheet for the exact accuracy and bandwidth figures applicable to each grade.
Which grade should be selected for industrial versus commercial designs?
For industrial or outdoor equipment exposed to temperatures down to −40°C, the AD637BRZ is the appropriate choice because of its extended temperature range and tighter accuracy. For benign, room-temperature commercial environments where the wider tolerance is acceptable, the AD637JRZ is the more economical option.