2026-09-08 You have an ADG411 on the BOM, but the quotation comes back with ADG412. The names look almost identical, and both are described as quad SPST analog switches. Is the second part an acceptable replacement?
The main difference between ADG411 and ADG412 is their control polarity: ADG411 turns a switch on with a logic-low input, while ADG412 turns it on with a logic-high input. With the same control signal applied, the two devices produce opposite switch states.
That difference matters more than the similarity of the part numbers. Before approving a substitution, check what the circuit expects each channel to do.
The difference is easiest to see in the truth table
Both devices contain four independently controlled single-pole, single-throw switches. Each control input operates its corresponding analog signal path.
| Control input | ADG411 | ADG412 |
|---|---|---|
| Logic low: 0 | ON: signal path connected | OFF: signal path disconnected |
| Logic high: 1 | OFF: signal path disconnected | ON: signal path connected |
Analog Devices explains this inverted control logic in its ADG412 product documentation. For pin assignments, electrical limits and ordering codes, use the ADG411/ADG412/ADG413 datasheet.
Here, “low” and “high” mean valid electrical logic levels specified by the datasheet. The table does not describe an unpowered device or an input left floating.
What could happen on an existing board?
Consider a measurement circuit that uses an ADG411 channel to connect a sensor signal when a controller output goes low. If an ADG412 is installed and the control signal stays unchanged, that same low level disconnects the path instead.
The board may still power up. The processor may still run. Yet the measurement path no longer follows the intended sequence. That is the kind of replacement problem that a package comparison alone will miss.
This example illustrates the logic difference; the actual effect depends on the schematic. In another design, the switch may select a calibration path, isolate an input or connect part of a test circuit.
It is also worth checking the interval before firmware starts controlling the pins. Pull-up resistors, pull-down resistors and controller reset states can determine the initial input levels. Changing the switch polarity can change the circuit’s behavior during that interval.
Can firmware make ADG412 replace ADG411?
In some designs, changing the control logic may be part of an engineering-approved substitution. It is not enough to assume that every output can simply be inverted.
The review should include any control signals generated by hardware, the states during reset, and the order in which signal paths connect and disconnect. A software change also needs to reach every affected assembly and remain traceable to the revised BOM.
For a repair where the original circuit and firmware must remain unchanged, sourcing the specified ordering code is usually the clearest starting point. For a redesign, evaluate the candidate on the actual board before releasing it for production.
Our analog switch and multiplexer sourcing guide provides the broader context for comparing signal-routing components.
Check more than the ON and OFF states
Control polarity is the first distinction in this comparison, but a purchasing decision still needs the full ordering code. A family name does not identify every package, temperature grade or packing option.
When reviewing ADG411BRZ-REEL7 or ADG412BRZ-REEL7, confirm the package drawing and pinout against the assembly documentation. Then compare the electrical specifications under the supply and temperature conditions used by the board.
For precision measurement circuits, the engineer may need to assess on-resistance, leakage and switching transients as well as the logic function. A headline specification is not a substitute for checking its test conditions.
Also keep the manufacturer prefix intact. ADG411 and DG411 are different ordering identifiers. Any cross-reference should retain the manufacturer and complete suffix so the proposed device can be reviewed without ambiguity.
Where does ADG413 fit?
ADG413 belongs to the same family but combines two switches with one control polarity and two with the opposite polarity. It is therefore not an all-channel equivalent of either ADG411 or ADG412.
If ADG413 appears in a supplier’s alternative list, check the channel-specific truth table and the circuit connections. The official ADG413 product page explains its mixed control behavior.
The practical lesson is simple: “same family” helps narrow a search, but it does not approve a substitution.
Make the RFQ clear about alternatives
A useful enquiry might read: “Please quote ADG411BRZ-REEL7, quantity 500, for an existing assembly. Exact part required. Quote any alternatives separately for engineering review.” Replace the quantity and requirements with those of your project.
That wording gives the buyer and supplier a shared boundary. An alternative can still be discussed, but it cannot be mistaken for the approved part.
Include the required delivery date, packing requirements and any documentation your purchasing process needs. For a larger project, our BOM sourcing guide explains how to organize multiple component requirements.
If you need ADG411BRZ-REEL7 or ADG412BRZ-REEL7, send EASYIEE your part number, quantity and delivery requirement to request current pricing and availability. Tell us whether your order requires an exact match or allows alternatives subject to approval.
