Part A
AD8361ARM
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 6375 PCS
- Package
- TSSOP-8
- Series
- Détecteur RF
Replacement verdict
Not a drop-in replacement
The AD8361ARM and AD8367ARU-REEL7 are not drop-in replacements for one another. The AD8361ARM is a 2.5 GHz RMS-responding power detector intended for RF power measurement, while the AD8367ARU-REEL7 is a 500 MHz variable gain amplifier with an integrated square-law detector. Their core functions, signal-chain roles, frequency ranges, and package footprints differ fundamentally, so substituting one for the other would require a redesign of the surrounding circuit rather than a direct swap.
Different device function
Different frequency range
Different package footprint
Different signal-chain role
Parts at a glance
Part B
AD8367ARU-REEL7
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 8032 PCS
- Package
- TSSOP-14
- Series
- Amplificateurs linéaires - instruments, amplificateurs opérationnels, amplificateurs tampons
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8361ARM | AD8367ARU-REEL7 | Why it matters |
|---|---|---|---|
| Function | RMS-responding power detector (TruPwr) | Variable gain amplifier (VGA) with AGC | These are fundamentally different signal-chain functions, so they are not direct substitutes in a circuit. |
| Frequency Range | DC to 2.5 GHz | 500 MHz (LF to 500 MHz) | Operating frequency band determines whether the part suits the target RF application. |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Supply range must match the system rail; both share the same range here. |
| Supply Current | ~1.1 mA (typical) | ~20 mA (typical) | Quiescent current affects power budget, especially in portable or dense designs. |
| Gain / Conversion Slope | 7.5 V/V rms (linear-in-V/V output) | -2.5 dB to +42.5 dB variable gain | Defines the transfer characteristic and how the device scales the input signal. |
| Output Type | Analog DC voltage proportional to input RMS | Amplified RF output with AGC detector | Output format determines how the device interfaces with downstream ADC or RF stages. |
| Package | 8-lead MSOP | 14-lead TSSOP | Footprint and pin count affect PCB layout and assembly compatibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both cover the industrial range, so thermal suitability is equivalent. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8361ARM | AD8367ARU-REEL7 |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Series | - | X-AMP® |
| Part Status | Obsolete | Obsolete |
| Amplifier Type | - | Variable Gain |
| Number of Circuits | - | 1 |
| -3 dB Bandwidth | - | 500 MHz |
| Current - Input Bias | - | 27 µA |
| Supply Current | 1.1 mA | 26mA |
| Voltage - Supply Span(Min) | - | 2.7 V |
| Voltage - Supply Span(Max) | - | 5.5 V |
| Operating Temperature | - | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Frequency | 2.5GHz | - |
| RF Type | Cellular, CDMA, W-CDMA | - |
| Input Range | 0 ~ 700mV | - |
| Accuracy | ±0.25dB | - |
| Voltage - Supply | 2.7V ~ 5.5V | - |
Frequently asked questions
What are the primary functional differences between the AD8361ARM and AD8367ARU-REEL7?
The AD8361ARM is a 2.5 GHz TruPwr RMS-responding power detector intended for measuring signal power in RF/IF systems, while the AD8367ARU-REEL7 is a 500 MHz, 45 dB linear-in-dB variable gain amplifier (VGA) with an integrated square-law detector. In short, the AD8361 is a power measurement device, and the AD8367 is a signal amplification/AGC device.
Are the AD8361ARM and AD8367ARU-REEL7 available in the same package?
No. The AD8361ARM is supplied in an 8-lead MSOP (RM suffix) package, whereas the AD8367ARU-REEL7 is supplied in a 14-lead TSSOP (RU suffix) package in tape-and-reel form. The two devices are not pin-compatible or footprint-compatible.
What frequency range does each device support?
The AD8361ARM operates from DC to 2.5 GHz, making it suitable for RF power detection in cellular, WLAN, and other high-frequency systems. The AD8367ARU-REEL7 operates over a 500 MHz bandwidth, targeting IF and lower-RF variable gain and AGC applications.
Can the AD8361ARM and AD8367ARU-REEL7 be used together in a signal chain?
Yes, they serve complementary roles. The AD8367ARU-REEL7 can provide linear-in-dB gain control and amplification in the signal path, while the AD8361ARM can independently measure RMS power at a relevant node. However, the AD8367 already includes an integrated detector for its internal AGC loop, so the AD8361 would typically be used for separate power monitoring rather than duplicating the AGC function.
What is the gain control characteristic of the AD8367ARU-REEL7?
The AD8367ARU-REEL7 provides a 45 dB gain range that is linear in dB, controlled by an analog gain voltage. This linear-in-dB behavior supports stable AGC loop dynamics and predictable gain versus control-voltage response.
What type of output does the AD8361ARM provide?
The AD8361ARM provides an RMS-responding, linear-in-voltage output proportional to the RMS value of the input signal, rather than a logarithmic (dB) output. This makes it suited to true RMS power measurement of modulated waveforms with varying crest factors.
Do these devices share the same supply voltage requirements?
Both devices operate from a single supply in the 2.7 V to 5.5 V range, which allows them to be used in common 3 V or 5 V system rails. Designers should still verify the exact recommended operating conditions and decoupling requirements in each respective datasheet.
Which device should be selected for AGC loop implementation?
The AD8367ARU-REEL7 is the appropriate choice for AGC loops because it integrates a variable gain amplifier with a square-law detector and error amplifier, enabling closed-loop automatic gain control. The AD8361ARM is a standalone RMS power detector and does not include gain control circuitry.