Vishay Siliconix DG642DJ-E3

Overview

DG642DJ-E3 from Vishay Siliconix is a single-pole double-throw (SPDT) analog switch optimized for wideband video and RF signal routing. It delivers 5 Ω typical on-resistance, 500 MHz bandwidth, -85 dB crosstalk at 5 MHz, 100 mA continuous current handling, and TTL-compatible digital control - enabling high-fidelity RGB switching and cellular front-end signal selection.

For engineers reviewing the DG642DJ-E3 datasheet, DG642DJ-E3 pinout, DG642DJ-E3 application, or DG642DJ-E3 equivalent, key selection criteria include bidirectional analog signal integrity up to ±5 V, fast 60 ns turn-on time, low 40 pF on-state input capacitance, and compatibility with dual-supply (±3 V to ±15 V) or single-supply (V− = GND) operation in high-speed routing designs.

Technical Context

The DG642DJ-E3 implements a silicon-gate D/CMOS process architecture to achieve simultaneous low R_DS(on), high bandwidth, and TTL-level logic compatibility without external level shifting. Its symmetrical source/drain terminals support true bidirectional analog conduction, while an on-chip regulator maintains consistent input threshold behavior across its full ±3 V to ±15 V supply range.

Designed for minimal signal degradation, the device features matched channel characteristics (0.5 Ω R_DS(on) match), low charge injection (-40 pC), and substrate isolation via epitaxial layer to prevent latchup - critical for maintaining differential phase/gain accuracy in composite video and satellite receiver signal paths.

Key Specifications

Pinout & Package

Package: 8-pin plastic DIP (JEDEC MS-012), 0.300" wide body, through-hole mounting compatible with legacy video equipment PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4682EPA+ and ADG781BRMZ, the DG642DJ-E3 uniquely combines 500 MHz bandwidth, ±5 V analog range, and 100 mA current capability in a through-hole DIP package - making it the only option among the three suitable for legacy broadcast video hardware and high-current RF test fixtures.

Availability

DG642DJ-E3 is available at Aetrix Electronics and suitable for RGB video routing, satellite receiver signal selection, and cellular front-end testing requiring stable component supply and long-term obsolescence management.

Supply support for DG642DJ-E3 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 analog switching, power management, and sensing solutions for demanding industrial and communications applications.

The DG642DJ-E3 belongs to Vishay's DG64x family of wideband video switches, engineered specifically for high-fidelity analog signal routing in broadcast, defense, and telecom infrastructure where bandwidth, crosstalk, and timing precision are non-negotiable.

FAQ

What is the maximum analog signal voltage range supported by the DG642DJ-E3?

The DG642DJ-E3 supports an analog signal range of ±5 V when operated with V− = −5 V and V+ = 12 V, or 0 to 8 V with V− = GND and V+ = 12 V. This range is defined by the absolute maximum ratings and verified in the datasheet's VANALOG specification. Signals exceeding these limits risk forward-biasing internal clamping diodes, so proper supply rail selection is essential for the DG642DJ-E3 to maintain signal fidelity in video and RF applications.

Does the DG642DJ-E3 require external decoupling capacitors, and if so, what values are recommended?

Yes, the DG642DJ-E3 requires dedicated decoupling on both V+ and V− pins to maintain 500 MHz bandwidth and minimize switching noise. The datasheet specifies 1–10 µF tantalum bead plus 10–100 nF ceramic capacitors mounted as close as possible to each supply pin. This dual-capacitor approach addresses both low-frequency supply ripple and high-frequency transient currents unique to the DG642DJ-E3's D/CMOS process, especially critical when V− serves as substrate reference.

Can the DG642DJ-E3 be used with a single positive supply, and how does that affect its performance?

Yes, the DG642DJ-E3 supports single-supply operation with V− tied to GND. In this configuration, the analog signal range becomes 0 to 8 V, and R_DS(on) increases slightly due to reduced body-effect modulation. Bandwidth remains at 500 MHz, but off-isolation degrades marginally. The DG642DJ-E3 retains full TTL compatibility and fast switching, making it viable for cost-sensitive 5 V systems where bipolar signal handling is not required.

What is the purpose of the epitaxial layer in the DG642DJ-E3 construction?

The epitaxial layer in the DG642DJ-E3 prevents latchup by isolating parasitic PNPN structures inherent in CMOS processes. This is critical for reliability in video and RF applications where transient overvoltages or ESD events could otherwise trigger destructive high-current states. Vishay's proprietary D/CMOS process integrates this layer to ensure robust operation across -40 °C to +85 °C without derating, directly supporting the DG642DJ-E3's use in field-deployed satellite receivers and radar systems.

How does the DG642DJ-E3 achieve TTL compatibility across its full supply voltage range?

The DG642DJ-E3 incorporates an on-chip regulator circuit that stabilizes input threshold voltages (VINH = 2.4 V, VINL = 0.8 V) regardless of V+ variation from 3 V to 15 V. This eliminates the need for external level shifters when interfacing with standard TTL or CMOS logic controllers. The regulator is integral to the D/CMOS process and is validated across temperature, ensuring consistent DG642DJ-E3 switching behavior in industrial environments where supply rails may fluctuate.