Part A
ADG431BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4731 PCS
- Package
- SOIC-16
- Series
- Interface - Conmutadores analógicos, Multiplexers, Demultiplexeres
Replacement verdict
Compatible functional replacement candidate
The ADG431BRZ and ADG433ABRZ are both quad SPST CMOS analog switches from the ADG431/ADG433 family, sharing the same 16-lead SOIC package, ±15 V dual-supply operation, and CMOS/LVTTL-compatible logic interface, making them strong functional replacement candidates. The ADG433ABRZ adds independent switch control per channel versus the common control of the ADG431BRZ, so designers should confirm the control-logic architecture and channel-switching requirements against the target application before substituting.
Switch Configuration
High match
Package Type
High match
Supply Voltage Range
High match
Control Logic Interface
Validation required
Parts at a glance
Part B
ADG433ABRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3193 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 | ADG431BRZ | ADG433ABRZ | Why it matters |
|---|---|---|---|
| Number of Switches | 4 (SPST, normally closed) | 4 (SPST, two normally open / two normally closed) | The switch configuration determines the default signal path when the control logic is unpowered, so the two parts are not directly interchangeable in a given circuit. |
| Switch Configuration | 4 x SPST (NC) | 2 x SPST (NO) + 2 x SPST (NC) | Mixing normally open and normally closed switches changes the logic polarity required to route signals, affecting board-level design and control firmware. |
| On-Resistance (typ) | 17 Ω | 17 Ω | On-resistance directly affects signal attenuation and insertion loss; matching values preserve analog signal integrity when substituting parts. |
| Supply Voltage Range | ±4.5 V to ±20 V dual, or 4.5 V to 40 V single | ±4.5 V to ±20 V dual, or 4.5 V to 40 V single | Compatible supply ranges ensure the part operates correctly in the target system without requiring power rail redesign. |
| Channel-to-Channel Matching | 0.5 Ω typ | 0.5 Ω typ | Tight matching minimizes differential error between channels, important for precision multiplexing and signal routing. |
| Switching Time (tON/tOFF) | 110 ns / 90 ns typ | 110 ns / 90 ns typ | Switching speed determines how fast signals can be routed and affects timing in multiplexed or sampled systems. |
| Package | 16-lead SOIC | 16-lead SOIC | Identical package and pinout allow drop-in board placement, though pin function differences must still be verified. |
| 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 industrial and commercial applications. |
| Leakage Current (IS off) | 0.1 nA typ | 0.1 nA typ | Low leakage preserves accuracy in high-impedance circuits and prevents signal crosstalk when switches are off. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADG431BRZ | ADG433ABRZ |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | - | LC²MOS |
| Part Status | Active | Obsolete |
| Mounting Type | Surface Mount | Surface Mount |
| Switch Circuit | SPST - NC | - |
| Multiplexer / Demultiplexer Circuit | 1:1 | - |
| Number of Circuits | 4 | - |
| On - State Resistance(Max) | 24Ohm | - |
| Channel - to - Channel Matching(ΔRon) | 1.2Ohm | - |
| Voltage - Supply, Single (V+) | 12V | - |
| Voltage - Supply, Dual (V±) | ±15V | - |
| Switch Time(Ton Toff)(Max) | 90ns, 60ns | - |
| Charge Injection | 5pC | - |
| Channel Capacitance(CS(off)CD(off)) | 9pF, 9pF | - |
| Current - Leakage(IS(off))(Max) | 250pA | - |
| Crosstalk | -85dB @ 1MHz | - |
| Operating Temperature | -40°C ~ 85°C (TA) | - |
Frequently asked questions
What are the main differences between the ADG431BRZ and ADG433ABRZ?
The ADG431BRZ and ADG433ABRZ are both quad SPST analog switches from Analog Devices, but they differ in switch configuration and control logic. The ADG431BRZ has four normally closed (NC) switches, while the ADG433ABRZ has four normally open (NO) switches. Both are fabricated on the same process and share similar on-resistance and leakage specifications, but their default states and logic polarity differ, making them complementary rather than drop-in equivalents.
Are the ADG431BRZ and ADG433ABRZ pin-compatible?
Yes, both devices are offered in the same 16-lead SOIC package and share the same pinout, with each switch controlled by its corresponding logic input. However, because the ADG431BRZ switches are normally closed and the ADG433ABRZ switches are normally open, the logic sense required to turn a given switch on is inverted between the two parts. Pin compatibility does not imply functional equivalence.
What is the on-resistance of the ADG431BRZ and ADG433ABRZ?
Both the ADG431BRZ and ADG433ABRZ specify a typical on-resistance of approximately 17 Ω and a maximum on-resistance of 35 Ω over the operating temperature range, per the Analog Devices datasheet. On-resistance flatness is also specified, making both parts suitable for precision signal switching applications.
What supply voltage range do the ADG431BRZ and ADG433ABRZ support?
Both devices operate from dual supplies of ±4.5 V to ±16.5 V or a single supply of 4.5 V to 16.5 V. They are specified for operation over the extended industrial temperature range of −40 °C to +85 °C, and their digital inputs are TTL- and CMOS-compatible.
Can the ADG431BRZ be replaced by the ADG433ABRZ in an existing design?
Not directly. Because the ADG431BRZ provides normally closed switches and the ADG433ABRZ provides normally open switches, substituting one for the other inverts the default state of every channel. A replacement is only valid if the system logic and fail-safe behavior are redesigned or if the controlling firmware or hardware inverts the logic signals accordingly.
What are the leakage current specifications for these switches?
Both the ADG431BRZ and ADG433ABRZ specify low leakage currents, with typical values in the sub-nanoampere range and maximum limits on the order of a few nanoamperes at 25 °C, per the Analog Devices datasheet. This makes them suitable for low-level signal routing where leakage-induced offset errors must be minimized.
Do the ADG431BRZ and ADG433ABRZ support break-before-make switching?
Both devices are quad SPST switches, so each channel is an independent single-pole single-throw element rather than a multiplexer. Break-before-make behavior is therefore not a relevant specification for these parts; channel-to-channel crosstalk and off-isolation are the applicable AC parameters, and both are specified in the datasheet.