Part A
AD637JR
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6307 個数
- Package
- SOIC-16
- Series
- PMIC - RMS-DCコンバータ
Replacement verdict
Compatible functional replacement candidate
The AD637JRZ is a RoHS-compliant, lead-free version of the AD637JR and serves as a direct functional replacement in the same SOIC-16 package with identical RMS-to-DC conversion specifications. The only meaningful distinction is package finish and environmental compliance, making the JRZ a suitable drop-in substitute where lead-free assembly is required.
Function and Accuracy
High match
Package Type
High match
Supply Voltage Range
High match
RoHS Compliance
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 | AD637JR | Why it matters |
|---|---|---|---|
| Package / Mounting Type | 16-Lead SOIC (Surface Mount) | 16-Lead SOIC (Surface Mount) | Both are SOIC-16 surface-mount devices, so board footprint and assembly are compatible. |
| RoHS Compliance | RoHS Compliant (Pb-free) | Non-RoHS (contains lead) | The "Z" suffix denotes lead-free/RoHS construction; this affects regulatory compliance and solder process selection. |
| Lead Finish | Matte Tin (Pb-free) | Tin-Lead (SnPb) | Lead finish determines solderability, reflow profile, and RoHS status for the assembly. |
| 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 Range | ±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 without redesign. |
| Bandwidth | 8 MHz (at 200 mV rms) | 8 MHz (at 200 mV rms) | Matching bandwidth ensures equivalent AC measurement capability across the signal spectrum. |
| Accuracy | 0.5% max error (RMS) | 0.5% max error (RMS) | Same accuracy specification means measurement precision is preserved when substituting parts. |
| Operating Temperature Range | 0°C to +70°C | 0°C to +70°C | Identical commercial temperature range supports the same application environments. |
| Pin Count | 16 | 16 | Same pin count and pinout allow drop-in replacement on an existing PCB layout. |
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 | AD637JR | AD637JRZ |
|---|---|---|
| Part Status | Obsolete | 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 difference between the AD637JRZ and the AD637JR?
The AD637JRZ and AD637JR are both RMS-to-DC converters from Analog Devices in a 16-lead SOIC package. The primary difference is the RoHS compliance suffix: the AD637JRZ is the RoHS-compliant version, while the AD637JR is the non-RoHS version. Both share the same core electrical specifications, including a 0.5% maximum error and an 8 MHz bandwidth for the AD637 series.
Are the AD637JRZ and AD637JR electrically interchangeable?
Yes. Both devices are the same AD637 RMS-to-DC converter die in the same 16-lead SOIC (R-16) package with identical pinout and electrical performance. The only documented difference is the RoHS compliance status indicated by the "Z" suffix. They can be used interchangeably in designs where RoHS compliance is not a constraint.
What does the "Z" suffix mean on the AD637JRZ?
The "Z" suffix in Analog Devices part numbering denotes RoHS compliance. The AD637JRZ is manufactured to be compliant with the Restriction of Hazardous Substances directive, whereas the AD637JR is the non-RoHS version of the same device.
What package do the AD637JRZ and AD637JR use?
Both the AD637JRZ and AD637JR are supplied in a 16-lead SOIC package (Analog Devices package designation R-16). The package dimensions, pinout, and PCB land pattern are identical between the two versions.
What are the key specifications of the AD637 series?
The AD637 is a high-accuracy RMS-to-DC converter with a maximum total error of 0.5% for the J grade, a bandwidth of 8 MHz, and a crest factor capability of up to 10. It computes the true RMS value of complex AC waveforms and provides a dB output. These specifications apply equally to the AD637JRZ and AD637JR.
Which version should be selected for a RoHS-compliant design?
The AD637JRZ should be selected for RoHS-compliant designs, as it carries the RoHS-compliant "Z" suffix. The AD637JR is the non-RoHS version and should only be used where RoHS compliance is not required.
Do the AD637JRZ and AD637JR differ in operating temperature range?
No. Both the AD637JRZ and AD637JR are specified for the commercial temperature range of 0°C to 70°C, consistent with the "J" grade designation in the Analog Devices part numbering scheme.