Part A
AD8362ARUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4014 PCS
- Package
- TSSOP-16
- Series
- Detectores RF
Replacement verdict
Not a drop-in replacement
The AD8361ARMZ and AD8362ARUZ are not drop-in replacements for one another. Although both are Analog Devices RMS-responding RF power detectors, they differ fundamentally in dynamic range, input frequency capability, package footprint, and supply/interface configuration, so substituting one for the other requires circuit redesign and full revalidation.
Different dynamic range
Different frequency range
Different package footprint
Different supply and interface
Parts at a glance
Part B
AD8361ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6139 PCS
- Package
- TSSOP-8
- Series
- Detectores RF
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8361ARMZ | AD8362ARUZ | Why it matters |
|---|---|---|---|
| Function | RMS-responding power detector (LF to 2.5 GHz) | RMS-responding power detector with logarithmic output (LF to 3.8 GHz) | Defines the core signal-processing behavior; the AD8362 provides a log-conformance output while the AD8361 provides a linear RMS output, affecting how the detector interfaces to downstream ADCs. |
| Frequency Range | LF to 2.5 GHz | LF to 3.8 GHz | Determines the maximum operating frequency; the AD8362 covers higher frequencies, so it can be used in applications where the AD8361 cannot. |
| Output Type | Linear (voltage proportional to RMS input) | Logarithmic (voltage proportional to dB of input) | Affects the transfer function and the required ADC resolution; a log output compresses a wide dynamic range into a smaller voltage span. |
| Dynamic Range | Approximately 30 dB | Approximately 65 dB | Sets the range of input power levels the detector can accurately measure; the AD8362 handles a much wider range, which is critical for power-control loops and RSSI measurements. |
| Input Impedance | 225 Ω (differential input) | 50 Ω (single-ended input) | Determines matching requirements; the AD8362's 50 Ω input simplifies interfacing to standard RF signal chains, while the AD8361 requires external matching. |
| Supply Voltage | 2.7 V to 5.5 V | 4.5 V to 5.5 V | Affects compatibility with the system power rail; the AD8361 can operate from lower supplies, while the AD8362 requires a nominal 5 V supply. |
| Supply Current | Approximately 1.1 mA | Approximately 20 mA | Impacts power budget; the AD8361 is far more power-efficient, making it suitable for battery-powered or low-power designs. |
| Package | 8-lead MSOP (RM) | 16-lead TSSOP (RU) | Affects PCB footprint and layout; the two parts are not pin-compatible, so a board redesign is required when substituting one for the other. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Confirms both parts are rated for industrial temperature environments, so thermal suitability is equivalent. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8362ARUZ | AD8361ARMZ |
|---|---|---|
| Part Status | Active | Active |
| Frequency | 50Hz ~ 3.8GHz | 2.5GHz |
| RF Type | Cellular, GSM, CDMA, TDMA, TETRA | Cellular, CDMA, W-CDMA |
| Input Range | -52dBm ~ 8dBm | 0 ~ 700mV |
| Accuracy | ±0.5dB | ±0.25dB |
| Voltage - Supply | 4.5V ~ 5.5V | 2.7V ~ 5.5V |
| Supply Current | 20 mA | 1.1 mA |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary functional differences between the AD8361ARMZ and AD8362ARUZ?
The AD8361ARMZ is a TruPwr™ RMS-to-DC converter that measures the RMS value of an AC signal up to 2.5 GHz, providing a linear-in-Volts output. The AD8362ARUZ is a 50 Hz to 3.8 GHz TruPwr™ RMS power detector that provides a linear-in-dB (decibel) output proportional to the RMS value of the input signal, making it suited for RF power measurement and control loops.
Are the AD8361ARMZ and AD8362ARUZ pin-compatible or package-compatible?
No. The AD8361ARMZ is supplied in an 8-lead MSOP (RM-8) package, while the AD8362ARUZ is supplied in a 16-lead TSSOP (RU-16) package. The pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for one another.
What is the specified frequency range for each device?
Per Analog Devices datasheets, the AD8361ARMZ operates from DC to 2.5 GHz, while the AD8362ARUZ operates from 50 Hz to 3.8 GHz. The AD8362ARUZ therefore extends to higher RF frequencies and lower into the audio range.
How do the output transfer functions of the AD8361ARMZ and AD8362ARUZ differ?
The AD8361ARMZ provides a linear-in-Volts output proportional to the RMS value of the input, with a nominal conversion gain specified in V/V RMS. The AD8362ARUZ provides a linear-in-dB output (voltage proportional to the logarithm of the RMS input power), with a nominal slope of 50 mV/dB and an intercept calibrated for power measurement. The choice depends on whether a linear RMS voltage or a dB-scaled power output is required.
What are the nominal supply voltage requirements for these devices?
Both devices are specified for a single-supply operation of 2.7 V to 5.5 V per Analog Devices datasheets. The AD8361ARMZ is characterized at 2.7 V and 5 V, and the AD8362ARUZ is characterized over the same 2.7 V to 5.5 V range.
Can the AD8362ARUZ be used for RF power amplifier control loops where the AD8361ARMZ is used?
Not as a direct substitute. The AD8362ARUZ's linear-in-dB output is specifically intended for closed-loop RF power control and measurement in dB terms, whereas the AD8361ARMZ's linear-in-Volts RMS output suits different signal-chain requirements. Substitution requires revalidation of the control-loop transfer function, slope, intercept, and package layout against the manufacturer datasheets.
Do both parts support operation over the industrial temperature range?
Yes. Both the AD8361ARMZ and AD8362ARUZ are specified for the industrial temperature range of −40°C to +85°C per their Analog Devices datasheets.