Part A
ADG409BR
ADI公司
- Lifecycle
- Active
- Stock
- 6238 件
- Package
- SOIC-16
- Series
- 介面-類比開關、多工器、解復用器
Replacement verdict
Compatible functional replacement candidate
The ADG408BR and ADG409BR are functionally related CMOS analog multiplexers from the same family, sharing identical package, supply, and signal-range characteristics, but they differ in switch configuration and channel count. The ADG408BR is an 8-channel single-ended multiplexer, while the ADG409BR is a 4-channel differential multiplexer, so substitution is only viable when the circuit can accommodate the different channel topology. Designers should validate channel configuration and control-logic addressing before committing to a drop-in replacement.
Channel Configuration
Validation required
Channel Count
Validation required
Package Type
High match
Supply Voltage Range
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 | ADG408BR | ADG409BR | Why it matters |
|---|---|---|---|
| Switch Configuration | 8:1 Multiplexer (single 8-to-1) | Dual 4:1 Multiplexer (two 4-to-1) | Determines the channel topology; an 8:1 mux cannot directly replace a dual 4:1 mux in circuits that route two independent differential or separate signal paths. |
| Number of Channels | 1 channel (8 inputs to 1 output) | 2 channels (4 inputs to 1 output each) | Affects how many independent signal paths can be switched simultaneously; critical for differential signal routing or multi-source selection. |
| On-Resistance (RON) | 100 Ω (typ) | 100 Ω (typ) | Lower on-resistance reduces signal attenuation and voltage drop across the switch, important for precision analog signal routing. |
| Supply Voltage Range | ±15 V dual supply (or 12 V single) | ±15 V dual supply (or 12 V single) | Must match the system power rails; both parts support the same bipolar and single-supply ranges, enabling similar analog signal swing. |
| Channel-to-Channel Matching (ΔRON) | 5 Ω (typ) | 5 Ω (typ) | Good matching minimizes gain error between channels, important for multiplexed measurement and data-acquisition systems. |
| Switching Time (tON / tOFF) | ~250 ns / ~150 ns (typ) | ~250 ns / ~150 ns (typ) | Determines how fast channels can be selected; affects throughput in multiplexed sampling and signal-routing applications. |
| Leakage Current (IS(OFF)) | 0.1 nA (typ) | 0.1 nA (typ) | Low leakage preserves accuracy in high-impedance circuits and prevents crosstalk between off channels. |
| Package | 16-lead SOIC | 16-lead SOIC | Identical footprint allows drop-in board compatibility without layout changes. |
| Logic Control Inputs | 3 address lines (A0, A1, A2) + EN | 2 address lines (A0, A1) + EN | Different control-line count changes the digital interface; firmware and PCB routing must be adapted when substituting one for the other. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADG409BR | ADG408BR |
|---|---|---|
| Part Status | Obsolete | Obsolete |
| Switch Circuit | SP4T | - |
| Multiplexer / Demultiplexer Circuit | 4:1 | 8:1 |
| Number of Circuits | 2 | 1 |
| 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, 20pF | 11pF, 40pF |
| 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 difference between the ADG408BR and ADG409BR?
The ADG408BR is an 8-channel analog multiplexer that selects one of eight inputs to a common output (or one output to eight inputs), while the ADG409BR is a 4-channel differential multiplexer that selects one of four differential input pairs to a common differential output. Both are CMOS analog multiplexers in the same 16-lead SOIC package, but their channel configurations differ.
Are the ADG408BR and ADG409BR pin-compatible?
No. Although both devices are offered in a 16-lead SOIC (R-16) package, their pin functions differ because the ADG408BR provides eight single-ended channels while the ADG409BR provides four differential channel pairs. The pin assignments are not interchangeable, so the PCB layout must match the specific device.
What are the key analog signal specifications of the ADG408BR and ADG409BR?
Both devices operate from dual supplies of ±15 V (or a single +12 V supply), feature low on-resistance of approximately 100 Ω typical, low charge injection, and fast switching times. They are fabricated on an enhanced LC²MOS process and are designed for precision analog signal routing in data acquisition and instrumentation systems.
Can the ADG408BR and ADG409BR be used with a single supply?
Yes. Both the ADG408BR and ADG409BR are specified for single-supply operation (typically +12 V) as well as dual-supply operation (±15 V). The digital control inputs are TTL/CMOS compatible, allowing direct interfacing with standard logic.
What is the difference in channel count and switching configuration?
The ADG408BR is an 8-to-1 single-ended multiplexer/demultiplexer, meaning it connects one of eight single-ended channels to a common terminal. The ADG409BR is a 4-to-1 differential multiplexer/demultiplexer, connecting one of four differential pairs to a common differential output. This makes the ADG409BR suitable for differential signal routing, while the ADG408BR suits single-ended signal selection.
Do both devices offer break-before-make switching?
Yes. Both the ADG408BR and ADG409BR feature break-before-make switching action, which prevents momentary shorting between adjacent channels during channel transitions. This is important for preventing signal corruption in multiplexed analog systems.
What are the digital control input characteristics of the ADG408BR and ADG409BR?
Both devices use standard TTL/CMOS-compatible digital inputs. The ADG408BR uses three address lines (A0, A1, A2) plus an enable input to select one of eight channels, while the ADG409BR uses two address lines (A0, A1) plus an enable input to select one of four differential channel pairs. Logic thresholds are compatible with both TTL and CMOS logic families.
Are the ADG408BR and ADG409BR suitable for direct substitution in an existing design?
No, they are not directly substitutable. Because the ADG408BR is an 8-channel single-ended multiplexer and the ADG409BR is a 4-channel differential multiplexer, their channel configurations, pin functions, and signal routing differ. A design targeting one device cannot simply accept the other without schematic and layout changes validated against the manufacturer datasheet.