Part A
ADG408BRZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1995 PCS
- Package
- SOIC-16
- Series
- Interface - Analog Switches, Multiplexers, Demultiplexers
Replacement verdict
Compatible functional replacement candidate
The ADG408BRZ and ADG409BR are both 8-channel CMOS analog multiplexers from the same family, sharing identical supply, signal range, and package characteristics, but they differ in switch configuration: the ADG408BRZ is an 8-to-1 multiplexer while the ADG409BR is a 4-channel differential multiplexer. Because the channel topology differs, the ADG409BR is not a direct drop-in substitute for the ADG408BRZ in single-ended applications, but it remains a viable functional candidate where differential switching is acceptable or where the circuit can be adapted to the different channel arrangement.
Switch Configuration
Validation required
Supply Voltage Range
High match
Package Type
High match
On-Resistance
High match
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADG408BRZ | ADG409BR | Why it matters |
|---|---|---|---|
| Switch Configuration | 8:1 Multiplexer (single 8-to-1) | 4:1 Differential Multiplexer (dual 4-to-1) | Defines the channel topology; an 8:1 mux and a differential 4:1 mux are not directly interchangeable in a circuit. |
| Number of Channels | 1 channel (8 inputs to 1 output) | 2 channels (differential, 4 inputs to 1 output each) | Affects how many signals can be routed and whether differential signal paths are supported. |
| On-Resistance (typ) | 100 Ω | 100 Ω | Lower on-resistance reduces signal attenuation and voltage drop across the switch. |
| Supply Voltage Range | ±15 V dual or +12 V single (dual supply ±5 V to ±20 V) | ±15 V dual or +12 V single (dual supply ±5 V to ±20 V) | Determines compatibility with the system power rails and signal swing headroom. |
| Package | 16-lead SOIC (R-16) | 16-lead SOIC (R-16) | Same footprint allows drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Confirms suitability for industrial and extended-temperature environments. |
| Switching Time (ton/toff, typ) | ~250 ns / ~150 ns | ~250 ns / ~150 ns | Impacts maximum multiplexing rate and settling behavior in sampled systems. |
| Control Logic Inputs | 3 address lines (A0, A1, A2) + EN | 2 address lines (A0, A1) + EN | Different address-line count changes the digital control interface and channel selection decoding. |
| Charge Injection (typ) | 20 pC | 20 pC | Low charge injection minimizes glitches when switching into high-impedance or capacitive loads. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADG408BRZ | ADG409BR |
|---|---|---|
| Part Status | Active | Obsolete |
| Switch Circuit | - | SP4T |
| Multiplexer / Demultiplexer Circuit | 8:1 | 4:1 |
| Number of Circuits | 1 | 2 |
| On - State Resistance(Max) | 100Ohm | 100Ohm |
| Channel - to - Channel Matching(ΔRon) | 15Ohm (Max) | 15Ohm (Max) |
| Voltage - Supply, Single (V+) | 12V | 12V |
| Voltage - Supply, Dual (V±) | ±15V | ±15V |
| Charge Injection | 20pC | 20pC |
| Channel Capacitance(CS(off)CD(off)) | 11pF, 40pF | 11pF, 20pF |
| Current - Leakage(IS(off))(Max) | 500pA | 500pA |
| Crosstalk | -85dB @ 100kHz | -85dB @ 100kHz |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the primary functional difference between the ADG408BRZ and the ADG409BR?
The ADG408BRZ is an 8-channel analog multiplexer that connects one of eight inputs to a single common output (or vice versa). The ADG409BR is a 4-channel differential multiplexer that connects one of four differential input pairs to a single differential output pair. Both are CMOS analog multiplexers from Analog Devices in 16-lead SOIC packages.
Are the ADG408BRZ and ADG409BR pin-compatible?
No. Although both are housed in a 16-lead SOIC package, their pin functions differ because the ADG408BRZ is single-ended 8-to-1 and the ADG409BR is differential 4-to-1. The pin assignments for address lines, signal inputs, and outputs are not interchangeable, so they cannot be dropped into the same PCB footprint without design changes.
What are the key analog signal specifications of the ADG408BRZ?
The ADG408BRZ features low on-resistance (typically around 100 Ω), low charge injection, and low power dissipation. It operates from dual supplies of ±15 V or single supplies of +12 V, and provides fast switching with tON and tOFF in the range of tens to low hundreds of nanoseconds, per the Analog Devices datasheet.
What are the key analog signal specifications of the ADG409BR?
The ADG409BR is a differential 4-channel multiplexer with low on-resistance (typically around 100 Ω), low charge injection, and low power consumption. It operates from dual ±15 V or single +12 V supplies and offers fast switching speeds comparable to the ADG408 family, as specified in the Analog Devices datasheet.
Can the ADG408BRZ and ADG409BR be used interchangeably in an existing design?
No. Because one is an 8-channel single-ended multiplexer and the other is a 4-channel differential multiplexer, they serve different signal-routing functions. Substitution requires verifying channel count, differential versus single-ended topology, pinout, and address decoding against the manufacturer datasheet before any redesign.
What supply voltage ranges do the ADG408BRZ and ADG409BR support?
Both devices are specified for dual-supply operation of ±15 V and single-supply operation of +12 V, with the analog signal range extending to the supply rails. Designers should confirm the exact limits and derating in the respective Analog Devices datasheets for the target application.
Which applications typically favor the ADG408BRZ versus the ADG409BR?
The ADG408BRZ is suited to single-ended signal routing such as data acquisition channel scanning and audio signal selection. The ADG409BR is suited to differential signal routing where common-mode rejection matters, such as differential sensor interfaces and balanced signal switching. Selection depends on whether the system requires single-ended or differential channel topology.