Vishay Siliconix DG442BDJ

Overview

DG442BDJ from Vishay Siliconix is a quad SPST analog switch IC designed for bidirectional signal routing in precision analog systems. It features 45 Ω typical on-resistance, 120 ns typical turn-on time, and ±15 V dual-supply operation, enabling low-distortion switching in data acquisition and sample-and-hold circuits.

For engineers reviewing the DG442BDJ datasheet, DG442BDJ pinout, DG442BDJ application, or DG442BDJ equivalent, key selection criteria include on-resistance matching (±4 Ω max), charge injection (–1 pC), off-isolation (–90 dB at 100 kHz), and TTL/CMOS-compatible control logic with single- or dual-supply flexibility.

Technical Context

The DG442BDJ implements four independent, normally-off analog switches with complementary control logic versus DG441B - high logic turns switches OFF, low logic turns them ON. Each channel conducts equally in both directions when active and blocks signals beyond supply rails when off.

It uses Vishay's high-voltage silicon-gate process with epitaxial isolation to prevent latchup. Charge injection is minimized at the drain terminal to reduce pedestal error in sampling applications, and internal clamping diodes protect against overvoltage transients on S/D/IN pins.

Key Specifications

Pinout & Package

Package: 16-pin plastic DIP (JEDEC MS-012), 10.0 mm × 4.0 mm body, 2.54 mm lead pitch, through-hole mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4618ESE+ and ADG1412BRUZ, the DG442BDJ delivers optimal balance of low on-resistance (45 Ω), dual-supply flexibility (±15 V), and proven latchup immunity - making it the preferred choice for industrial and medical instrumentation where reliability and bipolar signal integrity are non-negotiable.

Availability

DG442BDJ is available at Aetrix Electronics and suitable for data acquisition systems, medical instrumentation, automatic test equipment, and precision sample-and-hold circuits requiring stable component supply across extended temperature ranges (–40 °C to +85 °C).

Supply support for DG442BDJ 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 leader in discrete semiconductors and passive components, specializing in high-reliability power MOSFETs, analog switches, and precision resistors.

The DG442BDJ belongs to Vishay's high-speed CMOS analog switch family, engineered for low-error signal routing in mission-critical test, measurement, and medical systems where signal fidelity and long-term stability are essential.

FAQ

What is the maximum analog signal voltage range supported by the DG442BDJ?

The DG442BDJ supports a full analog signal range of ±15 V when operated with dual supplies (V+ = +15 V, V− = –15 V). This allows undistorted switching of bipolar signals up to the supply rails. With single-supply operation (V+ = 12 V, V− = 0 V), the usable analog range is 0 V to 12 V. Exceeding these limits triggers internal clamping diodes, so design margins should be maintained per Absolute Maximum Ratings.

How does the DG442BDJ differ from the DG441BDJ in logic behavior?

The DG442BDJ uses inverted logic control: a logic low (≤0.8 V) on INx turns the corresponding switch ON, while a logic high (≥2.4 V) turns it OFF. In contrast, the DG441BDJ uses non-inverted logic - high enables, low disables. This complementary pairing allows designers to select the appropriate version based on system-level control architecture without modifying PCB layout, as both share identical pinout and electrical specs.

Can the DG442BDJ operate from a single 5 V supply?

No - the DG442BDJ is not specified for reliable operation below 10 V total supply span. At V+ = 5 V and V− = 0 V, R_DS(on) degrades to 200 Ω (max) and dynamic performance suffers significantly. The datasheet specifies guaranteed operation only for V+ = 12 V / V− = 0 V (12 V single supply) or V+ = ±15 V dual supply. For true 5 V systems, consider alternatives like the MAX4618 or ADG1412.

What is the purpose of the NC pin (Pin 16) on the DG442BDJ DIP package?

Pin 16 on the DG442BDJ is designated NC (No Connect) - it has no internal bond wire or circuit connection and serves no electrical function. It must remain unconnected on the PCB. Unlike some packages where NC pins provide mechanical stability, this pin is fully isolated; soldering or grounding it may risk internal shorting or violate JEDEC MS-012 mechanical compliance.

Does the DG442BDJ require external bypass capacitors on its supply pins?

Yes - the DG442BDJ requires local 0.1 µF ceramic bypass capacitors placed as close as possible to Pins 4 (V−), 8 (GND), and 12 (V+). These minimize high-frequency supply noise coupling into analog paths and ensure stable switching transients. Without proper decoupling, measured t_ON/t_OFF can increase by >30%, and off-isolation may degrade by 10–15 dB due to supply rail bounce during switching events.