DG445BDJ

Overview

The DG445BDJ is a monolithic quad SPST CMOS analog switch manufactured by Vishay Siliconix in a 16-pin Plastic DIP package. It provides high-speed switching with a typical turn-on time of 120 ns and a maximum of 300 ns, alongside a typical on-resistance of 45 Ω (maximum 80 Ω). The device operates from dual supplies up to ±15 V or a single supply up to 12 V, drawing a maximum supply current of 1 µA. It features low charge injection of 1 pC and TTL/CMOS-compatible logic inputs.

Feature Summary

• High-speed switching action for fast signal throughput
• Low power consumption suitable for battery-operated systems
• Minimized charge injection for reduced pedestal errors
• TTL and CMOS compatible logic interface

Applications

• Audio Switching
• Data Acquisition Systems
• Sample-and-Hold Circuits
• Communication Systems
• Automatic Test Equipment

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and compliance status. Confirm availability as distribution channels may vary. Ensure the component meets the required environmental specifications for the intended application environment before finalizing procurement.

Selection Notes

Select this component when low distortion and high speed are required for analog signal routing. Verify that the 45 Ω typical on-resistance meets the system's voltage drop requirements. Ensure the logic input levels align with the control circuitry, as the device supports both TTL and CMOS standards.

Part Context

The DG445BDJ belongs to the DG444B/DG445B series, which are improved upgrades to the original DG444/DG445 models. These devices utilize a high-voltage silicon-gate process with an epitaxial layer to prevent latchup. The DG445B variant specifically offers inverted logic control compared to the DG444B.

Replacement Considerations

DG444BDJ serves as a logical alternative if non-inverted logic control is preferred over the DG445B's inverted configuration. Both share identical electrical characteristics and pinouts within the same package family.

FAQ

What is the difference between DG444B and DG445B?

The primary difference is the logic control. The DG444B turns ON when the input is Logic High (≥ 2.4 V), while the DG445B turns ON when the input is Logic Low (≤ 0.8 V).

What is the maximum analog signal range?

With dual supplies of ±15 V, the analog signal range is -15 V to +15 V. With a single supply of 12 V, the range is 0 V to 12 V.

How does the device handle signals exceeding supply rails?

Signals on the Source (S) or Drain (D) pins exceeding V+ or V- will be clamped by internal diodes. The forward diode current must be limited to the maximum current ratings to prevent damage.