Part A
ADG408BRZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1995 ПКС
- Package
- SOIC-16
- Series
- Интерфейс - аналоговые выключатели, мультиплексоры, демультиплексоры
Replacement verdict
Compatible functional replacement candidate
The ADG409BRZ and ADG408BRZ share the same 16-lead SOIC package, ±15 V dual-supply operation, and CMOS analog multiplexer architecture, making them viable functional substitutes in many designs. However, the ADG409BRZ is a 4-channel differential multiplexer while the ADG408BRZ is an 8-channel single-ended multiplexer, so channel configuration and signal routing must be validated before substitution.
Channel Configuration
Validation required
Package Type
High match
Supply Voltage Range
High match
On-Resistance
Validation required
Parts at a glance
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 | ADG408BRZ | Why it matters |
|---|---|---|---|
| Switch Configuration | 4-channel differential (2 x 4:1) | 8-channel single-ended (8:1) | Determines whether the mux routes differential pairs or single-ended signals, which is fundamental to signal topology and cannot be substituted without redesign. |
| Number of Channels | 4 differential channels | 8 single-ended channels | Channel count defines how many signal sources can be multiplexed; the two parts serve different channel-count requirements. |
| On-Resistance (RON) | 100 Ω (typ) | 100 Ω (typ) | On-resistance affects signal attenuation and voltage drop; matching values mean similar insertion loss behavior. |
| Supply Voltage Range | ±15 V dual / +12 V single | ±15 V dual / +12 V single | Compatible supply ranges allow the parts to operate in the same system power architecture. |
| Switch Time (tON/tOFF) | ~250 ns / ~150 ns | ~250 ns / ~150 ns | Switching speed impacts multiplexing rate and settling; identical timing supports similar dynamic performance. |
| Package | 16-lead SOIC (R-16) | 16-lead SOIC (R-16) | Same package footprint enables drop-in board compatibility without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings ensure equivalent environmental robustness for industrial applications. |
| Control Logic Inputs | 2 address lines (A0, A1) + EN | 3 address lines (A0, A1, A2) + EN | Different address-line counts change the digital control interface, requiring firmware or logic changes when substituting. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADG408BRZ | ADG409BRZ |
|---|---|---|
| Part Status | Active | 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 is the primary difference between the ADG409BRZ and ADG408BRZ?
The ADG408BRZ is an 8-channel analog multiplexer that connects one of eight inputs to a single common output, while the ADG409BRZ is a 4-channel differential multiplexer that switches one of four differential input pairs to a single differential output pair. Both are CMOS analog multiplexers in a 16-lead SOIC package.
Are the ADG408BRZ and ADG409BRZ pin-compatible?
No. Although both devices are housed in a 16-lead SOIC (R-16) package, their pin functions differ because the ADG408BRZ provides eight single-ended channels and the ADG409BRZ 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 switch specifications common to both devices?
Both the ADG408BRZ and ADG409BRZ are fabricated on the Analog Devices CMOS process and feature low on-resistance, low leakage currents, and TTL/CMOS-compatible digital control inputs. Both operate from dual supplies (typically ±15 V) or a single supply, and both offer break-before-make switching action to prevent momentary shorting between channels.
Can the ADG409BRZ replace the ADG408BRZ in an existing design?
Not directly. The ADG409BRZ is a differential 4-channel device, whereas the ADG408BRZ is a single-ended 8-channel device. Replacing one with the other requires redesigning the signal routing, the address decoding, and the PCB layout, and the channel count and signal topology must be revalidated against the application requirements.
What supply voltage ranges do the ADG408BRZ and ADG409BRZ support?
Both devices are specified for dual-supply operation (typically ±15 V) and for single-supply operation. The digital control inputs are compatible with TTL and CMOS logic levels, allowing direct interfacing with standard microcontrollers and logic devices. Designers should confirm the exact supply and logic thresholds against the respective Analog Devices datasheet for the target operating conditions.
How are the channels addressed on each device?
The ADG408BRZ uses three address lines (A0, A1, A2) to select one of eight single-ended channels. The ADG409BRZ uses two address lines (A0, A1) to select one of four differential channel pairs. Both devices include an enable (EN) input to turn all channels off, which is useful for power-down and signal isolation.
What are typical applications for the ADG408BRZ versus the ADG409BRZ?
The ADG408BRZ is typically used for single-ended signal routing such as data acquisition front ends, test equipment, and audio signal switching where eight single-ended channels are needed. The ADG409BRZ is suited to differential signal routing such as balanced audio, differential sensor interfaces, and precision instrumentation where common-mode rejection and paired signal integrity are important.
Do both devices offer break-before-make switching?
Yes. Both the ADG408BRZ and ADG409BRZ are designed with break-before-make switching, which ensures the currently selected channel is disconnected before the newly addressed channel is connected. This prevents momentary shorting between adjacent channels during channel changes, which is important in multiplexed signal chains.