DG445DJ

Overview

The DG445DJ is a monolithic, quad single-pole/single-throw (SPST) analog switch manufactured by Analog Devices Inc./Maxim Integrated. It features four independent normally open switches with TTL and CMOS compatible digital inputs. The device utilizes a high-voltage silicon-gate process to achieve an on-resistance of 85Ω maximum, with guaranteed matching between channels at 4Ω maximum and flatness over the signal range at 9Ω maximum. It operates from a single +10V to +30V supply or bipolar ±4.5V to ±20V supplies. Key electrical characteristics include a turn-on time of less than 250ns, a turn-off time of less than 70ns, charge injection of 10pC maximum, and off-leakage current of less than 5nA at +85°C. The component is housed in a 16-pin Plastic DIP package and supports an operating temperature range of -40°C to +85°C.

Feature Summary

• Improved on-resistance matching between channels and guaranteed on-resistance flatness over the signal range
• Low power consumption with low charge injection for simplified sample-and-hold applications
• High electrostatic discharge tolerance per Method 3015.7
• Rail-to-rail signal handling capability with bilateral switch operation

Applications

• Sample-and-Hold Circuits
• Test Equipment
• Heads-Up Displays
• Guidance and Control Systems
• Military Radios

Procurement Notes

Verify the specific ordering suffix 'DJ' to confirm the 16-pin Plastic DIP package and the industrial temperature range of -40°C to +85°C. Ensure compatibility with existing PCB footprints designed for this package type. Confirm that the logic supply voltage requirements align with the system's TTL or CMOS interface standards before finalizing procurement.

Selection Notes

Select the DG445DJ when normally open switch configuration is required, as opposed to the DG444 series which provides normally closed switches. Consider the improved on-resistance matching and lower charge injection compared to older DG211/DG212 generations. Evaluate the bipolar supply operation range of ±4.5V to ±20V against the system's available power rails to ensure optimal performance and signal integrity.

Part Context

The DG445DJ belongs to the DG444/DG445 family of improved, quad SPST analog switches. These devices serve as drop-in replacements for the industry-standard DG211 and DG212 series, offering enhanced performance through a redesigned silicon-gate process. The family includes variants with different packages and temperature ranges, such as the CY and DY for narrow SOIC packages, and ETE for Thin QFN.

Replacement Considerations

DG444DJ serves as a functional substitute if normally closed switch logic is acceptable instead of normally open.