Part A
ADG408BR
ADI公司
- Lifecycle
- Active
- Stock
- 5005 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 ADG409BRZ and ADG408BR are both 8-channel CMOS analog multiplexers from the same ADG408/ADG409 family, sharing a common 16-lead SOIC footprint and ±15 V dual-supply operation, but they differ in switch configuration: the ADG409BRZ is a differential 4-channel (2-of-8) multiplexer while the ADG408BR is a single-ended 8-channel (1-of-8) multiplexer. Because the channel topology is not interchangeable, the ADG409BRZ is not a direct drop-in substitute for the ADG408BR in circuits that depend on single-ended 8-to-1 routing; substitution is only viable where the differential 4-channel configuration is acceptable and the surrounding circuitry is re-validated.
Switch Configuration
Not compatible
Package Type
High match
Supply Voltage Range
High match
On-Resistance
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADG409BRZ | ADG408BR | Why it matters |
|---|---|---|---|
| Switch Configuration | 4-channel differential (2 x 4:1) | 8-channel single-ended (8:1) | Determines whether the part routes differential pairs or single-ended signals, which is fundamental to circuit topology and cannot be substituted without redesign. |
| Number of Channels | 4 differential channels | 8 single-ended channels | Channel count affects how many signals can be multiplexed and the physical pin usage, directly impacting board layout and signal routing. |
| On-Resistance (typ) | 100 Ω | 100 Ω | On-resistance introduces signal attenuation and error; matching values ensure similar signal integrity when swapping parts. |
| Supply Voltage Range | ±15 V dual (or +12 V single) | ±15 V dual (or +12 V single) | Compatible supply ranges allow the parts to operate in the same analog front-end without changing the power design. |
| Package | 16-lead SOIC (R-16) | 16-lead SOIC (R-16) | Identical package and pin count enable drop-in footprint compatibility on an existing PCB. |
| Switching Time (typ) | 150 ns | 150 ns | Switching speed affects multiplexing rate and settling behavior; equal values mean comparable dynamic performance. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching temperature ratings ensure both parts meet the same environmental requirements for the application. |
| Charge Injection (typ) | 20 pC | 20 pC | Charge injection causes glitches in sample-and-hold circuits; similar values preserve accuracy when substituting. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADG408BR | ADG409BRZ |
|---|---|---|
| Part Status | Obsolete | Active |
| 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 |
| Switch Circuit | - | SP4T |
Frequently asked questions
What are the key differences between the ADG409BRZ and the ADG408BR?
The ADG408BR is an 8-channel single-ended CMOS analog multiplexer, while the ADG409BRZ is a 4-channel differential CMOS analog multiplexer. Both are in a 16-lead SOIC package and share similar on-resistance and switching characteristics, but they differ in channel configuration: the ADG408 switches one of eight single-ended inputs to a common output, whereas the ADG409 switches one of four differential input pairs to a differential output.
Are the ADG409BRZ and ADG408BR pin-compatible?
No. Although both devices are offered in a 16-lead SOIC package, their pin functions differ because the ADG408 is an 8-to-1 single-ended multiplexer and the ADG409 is a 4-to-1 differential multiplexer. The address and signal pin assignments are not identical, so they cannot be treated as drop-in replacements without verifying the pinout against the respective datasheets.
What is the on-resistance of the ADG408BR and ADG409BRZ?
Both the ADG408BR and ADG409BRZ are specified with a typical on-resistance of approximately 100 Ω at ±15 V dual supplies, with a maximum on-resistance in the range of 100 Ω to 125 Ω depending on the grade and supply conditions. Designers should consult the manufacturer datasheet for the exact guaranteed limits over the full temperature range.
What supply voltages do the ADG408BR and ADG409BRZ support?
Both devices operate from dual supplies of ±15 V (with a range of ±10 V to ±15 V typical) or from a single supply of +12 V. They are CMOS analog multiplexers designed for precision signal switching in data acquisition and instrumentation applications, and the specified analog signal range depends on the applied supply voltages.
Can the ADG409BRZ be used to switch differential signals that the ADG408BR cannot handle?
Yes. The ADG409BRZ is specifically configured as a 4-channel differential multiplexer, so it can route four differential input pairs to a single differential output, which is useful for differential sensor or bridge signals. The ADG408BR is an 8-channel single-ended multiplexer and does not provide a native differential channel structure, so differential switching with the ADG408 requires external configuration.
Do the ADG408BR and ADG409BRZ have the same digital control interface?
Both devices use standard CMOS/TTL-compatible logic inputs for channel addressing. The ADG408BR uses a 3-bit binary address to select one of eight channels, while the ADG409BRZ uses a 2-bit address to select one of four differential channel pairs. The logic threshold levels and control pin functions should be confirmed against each device's datasheet before designing the address decoding.
What are the typical applications for the ADG408BR versus the ADG409BRZ?
The ADG408BR is typically used for single-ended signal routing such as multiplexing multiple sensor outputs, ADC input expansion, and audio or data signal switching. The ADG409BRZ is typically used where differential signal integrity matters, such as differential amplifier input selection, bridge sensor multiplexing, and precision instrumentation front ends.
Are the ADG408BR and ADG409BRZ available in the same package and temperature grade?
Both are commonly offered in a 16-lead SOIC package, and the "B" suffix in both part numbers denotes the commercial temperature grade. The ADG409BRZ includes the "Z" suffix indicating RoHS-compliant lead-free construction, while the ADG408BR part number as stated does not carry that suffix; designers should verify the exact ordering code and RoHS status with the manufacturer or authorized distributor.