Part A
AD637JRZ-RL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7145 PCS
- Package
- SOIC-16
- Series
- PMIC - RMS para DC Converters
Replacement verdict
Compatible functional replacement candidate
The AD637JRZ-RL and AD637BR are both true RMS-to-DC converters from the same AD637 family, sharing the same core conversion function and 24-lead SOIC footprint. The AD637BR offers a higher guaranteed accuracy grade, while the AD637JRZ-RL is a tape-and-reel packaged variant of the J-grade. They are functionally interchangeable in most RMS measurement applications, with the BR grade providing tighter accuracy specifications where precision is critical.
Function Type
High match
Package Type
High match
Accuracy Grade
Validation required
Supply Voltage Range
High match
Parts at a glance
Part B
AD637BR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4669 PCS
- Package
- SOIC-16
- 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 | AD637JRZ-RL | AD637BR | Why it matters |
|---|---|---|---|
| Package / Case | 16-Lead SOIC (R-16) | 16-Lead SOIC (R-16) | Package must match for a drop-in board replacement; both are 16-lead SOIC, so footprint is compatible. |
| Temperature Grade / Operating Range | Commercial (0°C to +70°C) | Industrial (-40°C to +85°C) | The B grade supports wider ambient temperatures, which matters for industrial or outdoor environments where the J grade may not be specified. |
| Accuracy / Total Error Grade | J grade (higher error tolerance) | B grade (tighter accuracy) | The B grade offers tighter guaranteed accuracy, which directly affects RMS measurement precision in critical instrumentation. |
| Input Offset Voltage (max) | Higher offset (J grade) | Lower offset (B grade) | Lower input offset reduces DC error in RMS-to-DC conversion, improving accuracy at low signal levels. |
| Scale Factor / Gain Error (max) | Looser gain error (J grade) | Tighter gain error (B grade) | Gain error determines output scaling accuracy; the B grade provides better guaranteed scale-factor accuracy. |
| Frequency Bandwidth | 2 MHz (typical, at 200 mV rms) | 2 MHz (typical, at 200 mV rms) | Bandwidth defines the maximum input frequency for accurate RMS conversion; both parts share the same core bandwidth. |
| Supply Voltage Range | ±3 V to ±18 V (dual supply) | ±3 V to ±18 V (dual supply) | Supply range must match the system rails; both parts support the same dual-supply window. |
| Supply Current (typical) | ~2.2 mA | ~2.2 mA | Quiescent current affects power budget; identical current draw means no change in power consumption. |
| Packaging / Ordering Format | Tape and reel (RL) | Tube / bulk | Packaging format affects assembly line handling; reel vs tube must match the production pick-and-place setup. |
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-RL | AD637BR |
|---|---|---|
| Part Status | Active | Obsolete |
| 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 key differences between the AD637JRZ-RL and the AD637BR?
Both devices are RMS-to-DC converters from Analog Devices in the AD637 family, but they differ in grade and packaging. The AD637BR is a higher-grade commercial version specified over the 0°C to 70°C temperature range with tighter accuracy specifications, supplied in a 16-lead SOIC (R-16) tube or tray format. The AD637JRZ-RL is the J-grade commercial version in a 16-lead SOIC, supplied in tape-and-reel packaging (RL suffix) and specified over 0°C to 70°C with the standard J-grade accuracy tolerances. The BR grade offers tighter guaranteed linearity and total error than the JR grade.
Are the AD637JRZ-RL and AD637BR pin-compatible?
Yes. Both the AD637JRZ-RL and AD637BR are offered in the same 16-lead SOIC (R-16) package with identical pin functions, so they are pin-compatible when both are in the SOIC package. The primary differences are grade-level accuracy specifications and delivery format (tape-and-reel for the -RL version versus standard packaging for the BR).
Can the AD637JRZ-RL be used as a drop-in replacement for the AD637BR?
Pin compatibility in the SOIC package allows a physical drop-in, but the substitution should be validated against the design's accuracy budget. The BR grade carries tighter guaranteed specifications (for example, linearity and total error) than the JR grade, so replacing a BR with a JR part may reduce measurement accuracy margin. Review the AD637 datasheet grade specifications and confirm the JR-grade limits meet the application requirements before substituting.
What is the difference between the J and B grades of the AD637?
In the AD637 family, the B grade is a higher-precision commercial grade with tighter guaranteed error specifications, while the J grade is the standard commercial grade with wider guaranteed tolerances. Both are specified over the 0°C to 70°C commercial temperature range. The grade letter indicates the guaranteed accuracy tier rather than a functional difference; both devices perform true RMS-to-DC conversion using the same core architecture.
What does the -RL suffix on the AD637JRZ-RL indicate?
The -RL suffix denotes tape-and-reel packaging for automated assembly. The AD637JRZ-RL is supplied in tape-and-reel format in the 16-lead SOIC package, which is suited to high-volume pick-and-place production. The AD637BR is supplied in standard tube/tray packaging. The electrical grade is indicated by the J or B letter, not by the -RL suffix.
Do the AD637JRZ-RL and AD637BR have the same functional architecture?
Yes. Both are members of the AD637 family of high-accuracy monolithic RMS-to-DC converters, providing true RMS conversion of AC signals with the same core computational architecture, including the implicit RMS computation and the on-chip buffer amplifier. Functional behavior and pin functions are the same; the differences are limited to guaranteed accuracy grade and packaging format.
Which part should be selected for a high-volume automated assembly line?
The AD637JRZ-RL is the appropriate choice for high-volume automated assembly because its -RL suffix indicates tape-and-reel packaging designed for pick-and-place equipment. The AD637BR is supplied in standard packaging. If the design requires the tighter B-grade accuracy specifications, confirm the available packaging options for the B grade with the manufacturer or authorized distributor before finalizing the assembly format.
Where can verified specifications for the AD637JRZ-RL and AD637BR be obtained?
Authoritative specifications are available from the Analog Devices AD637 datasheet, which lists the grade-specific accuracy, linearity, and temperature specifications for the J and B grades, and from authorized distributors such as DigiKey, Mouser, and TTI, which publish ordering codes, packaging formats, and grade information. Always confirm grade-specific limits and packaging against the current manufacturer datasheet before design or procurement decisions.