Part A
AD8361ARM
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6375 PCS
- Package
- TSSOP-8
- Series
- RF Detectors
Replacement verdict
Not a drop-in replacement
The AD8367ARU and AD8361ARM are not drop-in replacements for one another. Although both are Analog Devices RF/IF building blocks, they serve fundamentally different functions: the AD8367ARU is a variable-gain amplifier (VGA) with an integrated square-law detector, while the AD8361ARM is a standalone RMS-responding power detector. Their differing core functions, output characteristics, supply requirements, and package footprints make direct substitution impractical without redesign.
Different core function
Different output type
Different supply voltage
Different package footprint
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8367ARU | AD8361ARM | Why it matters |
|---|---|---|---|
| Function | Variable gain amplifier (VGA) with integrated rms detector | RF rms power detector | Defines the core signal-chain role; a VGA amplifies/attenuates while a detector only measures power, so they are not direct substitutes. |
| Frequency range | LF to 500 MHz | LF to 2.5 GHz | Determines the operating band; the detector covers much higher frequencies than the VGA. |
| Gain / measurement range | -2.5 dB to +42.5 dB (45 dB gain range) | 30 dB measurement range (linear-in-dB output) | Sets the dynamic range available for amplification versus power measurement. |
| Output type | Amplified RF signal plus rms-detector DC output | DC voltage proportional to input rms power | Determines whether the device delivers an RF signal or a baseband power indication. |
| Supply voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Both operate from the same supply window, easing power-rail compatibility. |
| Package | 16-lead TSSOP | 8-lead MSOP | Affects PCB footprint and layout; the two parts are not pin-compatible. |
| Input impedance / interface | 200 Ω differential input, gain controlled by analog voltage | Single-ended RF input, 50 Ω system oriented | Impacts matching network design and how the device is driven in the signal chain. |
| Typical application | AGC and gain-control loops in receivers/transmitters | RF power measurement and level detection | Clarifies intended use; substituting one for the other requires redesigning the surrounding circuit. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8361ARM | AD8367ARU |
|---|---|---|
| Part Status | Obsolete | Obsolete |
| Frequency | 2.5GHz | - |
| RF Type | Cellular, CDMA, W-CDMA | - |
| Input Range | 0 ~ 700mV | - |
| Accuracy | ±0.25dB | - |
| Voltage - Supply | 2.7V ~ 5.5V | - |
| Supply Current | 1.1 mA | 26mA |
| Mounting Type | Surface Mount | Surface Mount |
| Series | - | X-AMP® |
| Amplifier Type | - | Variable Gain |
| Number of Circuits | - | 1 |
| -3 dB Bandwidth | - | 500 MHz |
| Current - Input Bias | - | 27 µA |
| Voltage - Supply Span(Min) | - | 2.7 V |
| Voltage - Supply Span(Max) | - | 5.5 V |
| Operating Temperature | - | -40°C ~ 85°C |
Frequently asked questions
What are the primary functional differences between the AD8367ARU and the AD8361ARM?
The AD8367ARU is a 500 MHz, 45 dB linear-in-dB variable gain amplifier (VGA) with an integrated square-law detector, designed for receive signal chain AGC applications. The AD8361ARM is a 2.5 GHz TruPwr RMS-responding power detector intended for RF power measurement. In short, the AD8367ARU amplifies and adjusts gain, while the AD8361ARM measures RF power.
Do the AD8367ARU and AD8361ARM use the same package and pinout?
No. The AD8367ARU is supplied in a 14-lead TSSOP package, while the AD8361ARM is supplied in an 8-lead MSOP package. The pin counts, pin functions, and PCB land patterns differ, so they are not footprint-compatible and cannot be interchanged on the same board layout.
What are the operating frequency ranges of the AD8367ARU and AD8361ARM?
The AD8367ARU is specified for operation from DC to 500 MHz. The AD8361ARM is specified for operation from DC to 2.5 GHz. The AD8361ARM therefore covers a substantially higher frequency range, consistent with its role as an RF power detector.
Can the AD8367ARU and AD8361ARM be used together in a single signal chain?
Yes, they serve complementary functions. The AD8367ARU can provide variable gain amplification in the receive path, and the AD8361ARM can be used to measure RF power at a relevant node. Because the AD8367ARU includes an integrated detector for its own AGC loop, the AD8361ARM would typically be used for independent power monitoring rather than as a replacement for the on-chip detector.
What are the supply voltage requirements for each device?
The AD8367ARU operates from a single 5 V supply. The AD8361ARM operates from a single 2.7 V to 5.5 V supply. Designs must account for these differences, particularly if a common rail is intended for both devices.
Which device is appropriate for automatic gain control (AGC) versus RF power measurement?
The AD8367ARU is the appropriate choice for AGC because it is a variable gain amplifier with an integrated square-law detector that supports closed-loop gain control. The AD8361ARM is appropriate for RF power measurement because it is an RMS-responding power detector that outputs a voltage proportional to the RMS value of the input signal.
Are the AD8367ARU and AD8361ARM directly substitutable in an existing design?
No. They differ in function, package, pinout, frequency range, and supply requirements. Direct substitution is not possible; any design change involving one in place of the other requires schematic, layout, and performance validation against the respective manufacturer datasheets.