Part A
ADG433BR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4183 PCS
- Series
- Interface - Conmutadores analógicos, Multiplexers, Demultiplexeres
Replacement verdict
Not a drop-in replacement
The ADG439FBRZ and ADG433BR are not drop-in replacements for one another. The ADG439FBRZ is a fault-protected analog multiplexer with a different switch configuration, channel count, and package, while the ADG433BR is a standard quad SPST switch. Designers must account for differences in fault protection, switch architecture, channel count, and package footprint before considering any substitution.
Different switch configuration
Different channel count
Different package footprint
Fault protection not present
Parts at a glance
Part B
ADG439FBRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6003 PCS
- Package
- SOIC-16
- Series
- Interface - Conmutadores analógicos, Multiplexers, Demultiplexeres
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADG439FBRZ | ADG433BR | Why it matters |
|---|---|---|---|
| Number of Channels | 4 | 4 | Both are quad switches, so channel count is functionally equivalent for multi-signal routing. |
| Switch Configuration | 4 x SPST (Normally Closed) | 4 x SPST (Normally Closed) | Switch topology determines how signals are connected in the default and energized states; matching topology supports direct substitution. |
| On-Resistance (Typical) | ~100 Ω | ~45 Ω | Lower on-resistance reduces signal attenuation and voltage drop; a significant difference affects analog signal integrity. |
| 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 system rails without redesign. |
| Fault Protection | Yes (fault-protected) | No | Fault protection safeguards the switch and downstream circuitry from overvoltage; this is a critical functional difference for robust designs. |
| Package | 16-Lead SOIC | 16-Lead SOIC | Identical package and pinout enable drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching temperature ratings ensure equivalent environmental performance in the target application. |
| Switching Time (tON/tOFF) | ~250 ns / ~150 ns | ~120 ns / ~90 ns | Switching speed affects timing in multiplexing and signal-routing applications; faster switching may be required for high-speed systems. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADG433BR | ADG439FBRZ |
|---|---|---|
| Part Status | Obsolete | Active |
| Base Product Number | ADG433 | - |
| Switch Circuit | SPST - NO/NC | SP4T |
| Multiplexer / Demultiplexer Circuit | 1:1 | 4:1 |
| Number of Circuits | 4 | 2 |
| On - State Resistance (Max) | 24Ohm | - |
| Channel - to - Channel Matching (ΔRon) | 1.2Ohm | - |
| Voltage - Supply, Single (V+) | 12V | 15V |
| Voltage - Supply, Dual (V±) | ±15V | ±15V |
| Switch Time (Ton, Toff) (Max) | 90ns, 60ns | - |
| Charge Injection | 5pC | 15pC |
| Channel Capacitance (CS(off), CD(off)) | 9pF, 9pF | - |
| Current - Leakage (IS(off)) (Max) | 250pA | - |
| Crosstalk | -85dB @ 1MHz | -93dB @ 100kHz |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Packaging | Tube | - |
| On - State Resistance(Max) | - | 270Ohm (Typ) |
| Channel - to - Channel Matching(ΔRon) | - | 8.1Ohm |
| Switch Time(Ton Toff)(Max) | - | 230ns, 130ns |
| Channel Capacitance(CS(off)CD(off)) | - | 3pF, 22pF |
| Current - Leakage(IS(off))(Max) | - | 500pA |
Frequently asked questions
What are the key differences between the ADG439FBRZ and the ADG433BR?
The ADG439FBRZ is a fault-protected analog multiplexer with 4 differential channels (or 8 single-ended), featuring overvoltage fault protection up to ±40 V, while the ADG433BR is a standard CMOS quad single-pole single-throw (SPST) switch without fault protection. The ADG439FBRZ is designed for applications where input signals may exceed supply rails, whereas the ADG433BR is suited for general-purpose signal switching within supply limits.
What are the supply voltage ranges for the ADG439FBRZ and ADG433BR?
The ADG439FBRZ operates from dual supplies of ±15 V (or ±12 V) and also supports single-supply operation from +12 V to +44 V. The ADG433BR operates from dual supplies of ±15 V or single supply of +12 V. Both are specified for ±15 V dual-supply operation, but the ADG439FBRZ offers a wider single-supply range.
Do the ADG439FBRZ and ADG433BR have the same package and pinout?
No. The ADG439FBRZ is supplied in a 16-lead SOIC (R-16) package, while the ADG433BR is supplied in a 16-lead SOIC (R-16) package as well, but the pin functions differ because the ADG439FBRZ is a 4-differential-channel multiplexer and the ADG433BR is a quad SPST switch. The pinouts are not interchangeable, and PCB layouts must be designed accordingly.
What is the on-resistance of the ADG439FBRZ and ADG433BR?
The ADG439FBRZ has a typical on-resistance of 100 Ω (maximum 175 Ω) at ±15 V. The ADG433BR has a typical on-resistance of 45 Ω (maximum 85 Ω) at ±15 V. The ADG433BR provides lower on-resistance, making it more suitable for low-distortion signal paths.
Does the ADG439FBRZ provide fault protection that the ADG433BR lacks?
Yes. The ADG439FBRZ features fault protection that limits current to a few nanoamperes when an input exceeds the supply rails by up to ±40 V, protecting both the switch and downstream circuitry. The ADG433BR does not include fault protection; input signals must remain within the supply rails to avoid damage or latch-up.
What are the switching times of the ADG439FBRZ and ADG433BR?
The ADG439FBRZ has typical turn-on and turn-off times of 250 ns and 150 ns, respectively, at ±15 V. The ADG433BR has typical turn-on and turn-off times of 110 ns and 70 ns, respectively, at ±15 V. The ADG433BR switches faster, which may be advantageous in high-speed multiplexing applications.
Can the ADG439FBRZ and ADG433BR be used in single-supply systems?
Yes, both devices support single-supply operation. The ADG439FBRZ operates from a single supply of +12 V to +44 V, while the ADG433BR operates from a single supply of +12 V. The ADG439FBRZ offers a wider single-supply range, but the ADG433BR is limited to +12 V in single-supply mode.
What are the leakage current specifications for the ADG439FBRZ and ADG433BR?
The ADG439FBRZ has typical off leakage current of 0.1 nA and on leakage current of 0.1 nA at ±15 V. The ADG433BR has typical off leakage current of 0.1 nA and on leakage current of 0.1 nA at ±15 V. Both devices exhibit low leakage, but the ADG439FBRZ maintains low leakage even under fault conditions due to its protection circuitry.