DG508BEQ-T1-E3

Overview

The DG508BEQ-T1-E3 is a single 8:1 CMOS analog multiplexer manufactured by Vishay Siliconix. It connects one of eight inputs to a common output via a 3-bit binary address (A0, A1, A2). The device operates with single or dual power supplies ranging from ±5 V to ±20 V, or up to 44 V absolute maximum rating. Key electrical parameters include a maximum on-resistance of 380 Ω at room temperature and 480 Ω across the full temperature range (-40 °C to +125 °C). Transition time is typically 145 ns, with enable turn-on/off times of 250 ns and 240 ns respectively. It features break-before-make switching, TTL-compatible control inputs, and an Enable (EN) pin for resetting all switches to the off state.

Feature Summary

• Break-before-make switching action prevents momentary crosstalk between adjacent channels.
• TTL-compatible digital control inputs allow direct interfacing with standard logic families.
• Enable function permits resetting the multiplexer to all switches off for stacking multiple devices.
• Epitaxial layer construction ensures latch-up immunity under specified stress conditions.

Applications

• High-speed and high-precision data acquisition systems
• Audio signal switching and routing
• Automated Test Equipment (ATE) systems
• Avionics instrumentation

Procurement Notes

Verify the specific package suffix 'EQ' corresponds to the TSSOP-16 form factor required for your PCB layout. Confirm that the 'E3' suffix indicates lead-free compliance and RoHS adherence as per Vishay's material categorization definitions. Ensure the operating environment stays within the -40 °C to +125 °C temperature range specified for this part number.

Selection Notes

Select this component when an 8-channel single-ended multiplexing configuration is required in a surface-mount TSSOP-16 package. Consider the DG509BEQ-T1-E3 if a dual 4:1 differential configuration is needed instead. Verify that the 380 Ω maximum on-resistance meets the signal integrity requirements of your application circuit.

Part Context

This part belongs to the DG508B/DG509B series, which are enhanced versions fabricated on an SG-II CMOS process. This technology reduces charge injection, lowers leakage, and minimizes parasitic capacitance compared to legacy counterparts. The series serves as a superior alternative to older industry-standard parts like the ADG508A and HI-508.

Replacement Considerations

Public datasheets list ADG508A, DG508A, and HI-508 as functional alternatives. Verify pin compatibility and electrical parameter margins before substitution, as legacy parts may differ in on-resistance or supply voltage ratings.

FAQ

How does the Enable (EN) pin affect the switch states?

When the EN input is low (Logic 0), all switches are forced to the off state regardless of the address inputs. When EN is high (Logic 1), the selected channel based on A0, A1, and A2 turns on.

What is the purpose of the break-before-make switching action?

It ensures that the previous channel disconnects before the new channel connects, preventing momentary crosstalk or short circuits between adjacent input signals during switching transitions.

Is the DG508BEQ-T1-E3 latch-up immune?

Yes, the device includes an epitaxial layer that provides latch-up protection, ensuring reliable operation even when input signals exceed the supply rails within the absolute maximum ratings.