Vishay Siliconix DG444BDY

Overview

DG444BDY from Vishay Siliconix is a monolithic quad SPST CMOS analog switch optimized for bidirectional signal routing in precision analog systems. It delivers 45 Ω typical on-resistance, 120 ns typical turn-on time (with unipolar 12 V supply), and ±15 V analog signal range - enabling low-distortion switching in data acquisition front-ends and sample-and-hold circuits.

For engineers reviewing the DG444BDY datasheet, DG444BDY pinout, DG444BDY application, or DG444BDY equivalent, key selection criteria include dual-supply operation capability, sub-1 pC charge injection, TTL/CMOS-compatible control logic, and SOIC-16 packaging with verified 16-pin narrow-body footprint compliance.

Technical Context

The DG444BDY implements four independent SPST switches using high-voltage silicon-gate CMOS technology with epitaxial latchup protection. Each channel conducts equally in both directions when on and blocks signals beyond supply rails when off.

It supports dual-supply operation (±15 V) or unipolar supply (0 to 12 V), with logic-level translation via separate VL pin (2.4 V min high, 0.8 V max low). Charge injection is minimized at the drain terminal to reduce pedestal error in sampling applications.

Key Specifications

Pinout & Package

Package: 16-pin narrow-body SOIC (JEDEC MS-012), 3.80–4.00 mm width, 9.80–10.00 mm length, 1.27 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad SPST analog switch applications.

Compared with DG444BDY, MAX4617ESE+ trades isolation and rail-to-rail analog range for lower cost in 5 V systems, while ADG1414BRUZ delivers order-of-magnitude lower on-resistance and wider supply tolerance at the expense of SOIC-16 compatibility and increased BOM complexity.

Availability

DG444BDY is available at Aetrix Electronics and suitable for data acquisition systems, medical instrumentation, and automated test equipment requiring stable component supply across industrial temperature ranges (-40 °C to +85 °C).

Supply support for DG444BDY includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay Siliconix is a global semiconductor manufacturer specializing in discrete power MOSFETs, analog switches, and precision resistive components with emphasis on reliability and ruggedized design.

The DG444BDY belongs to Vishay's high-speed analog switch product line, engineered for low-error signal routing in measurement-grade instrumentation and industrial control systems where signal fidelity and supply flexibility are critical.

FAQ

What is the maximum analog signal voltage range supported by the DG444BDY?

The DG444BDY supports an analog signal range of ±15 V when operated with dual supplies (V+ = +15 V, V− = −15 V), or 0–12 V with unipolar supply (V+ = 12 V, V− = 0 V). Exceeding these limits risks clamping by internal diodes or violating absolute maximum ratings. The DG444BDY maintains full functionality and specified R_DS(on) within these bounds across its full operating temperature range.

Does the DG444BDY require external pull-up or pull-down resistors on its INx control pins?

No, the DG444BDY does not require external pull-up or pull-down resistors on its IN1–IN4 pins. Its TTL/CMOS-compatible inputs have guaranteed thresholds (VINL ≤ 0.8 V, VINH ≥ 2.4 V) and low input current (±1 µA max), allowing direct connection to microcontroller GPIOs or FPGA outputs. The DG444BDY remains fully functional with clean logic edges and no external biasing.

Can the DG444BDY operate with different voltages on V+ and V−, such as V+ = +12 V and V− = −5 V?

Yes, the DG444BDY supports asymmetric dual supplies as long as the absolute difference between V+ and V− does not exceed 44 V and each rail stays within its individual absolute maximum rating (V+ ≤ +22 V, V− ≥ −22 V). For example, V+ = +12 V and V− = −5 V yields a 17 V span and is valid. The DG444BDY maintains specified R_DS(on) and switching times across such configurations.

How does the VL pin function, and what happens if it is left unconnected?

The VL pin sets the logic threshold reference for the INx inputs and must be connected to a stable voltage between (GND − 0.3 V) and (V+ + 0.3 V). If left floating, input thresholds become undefined and switching behavior unreliable. The DG444BDY requires VL = 5 V for standard TTL/CMOS compatibility, but it can be tied to 3.3 V or other logic supplies - the DG444BDY adapts its input recognition accordingly without affecting analog performance.

Is the DG444BDY pin-compatible with the older DG444 or DG444B variants in SOIC-16 packages?

Yes, the DG444BDY is pin-compatible with all DG444B variants in 16-pin narrow SOIC packages, including DG444BDY-E3 and DG444BDY-T1-E3. The pinout, footprint, and electrical interface are identical across these ordering variants. The DG444BDY shares the same functional block diagram, truth table, and timing characteristics as the base DG444B, making it a direct replacement in existing designs without layout changes.