Vishay Siliconix DG641DY

Overview

DG641DY from Vishay Siliconix is a quad single-pole single-throw (SPST) analog switch IC designed for high-fidelity video and RF signal routing. It delivers 500 MHz bandwidth, <5 Ω typical on-resistance (R_DS(on)), −87 dB crosstalk at 5 MHz, and operates from dual supplies (V+ = +15 V, V− = −3 V) or single supply with ground-referenced V−. It is used in RGB video multiplexing, satellite receiver front-ends, and ATE signal path switching.

For engineers reviewing the DG641DY datasheet, DG641DY pinout, DG641DY application, or DG641DY equivalent, key selection criteria include bidirectional analog signal handling up to ±5 V, TTL-compatible digital control, fast 50 ns turn-on time, low charge injection (−19 pC), and SOIC-16 package compatibility with standard PCB layout practices for high-frequency analog integrity.

Technical Context

The DG641DY uses Vishay's proprietary D/CMOS process to achieve simultaneous low R_DS(on) (8 Ω max), low channel capacitance (CS(on) = 10–20 pF), and high off-isolation (−60 dB). Its on-chip regulator ensures TTL logic compatibility across full supply voltage range without external level-shifting.

Each of its four SPST switches conducts identically in both directions when enabled and blocks signals up to 14 V_p-p when off. An epitaxial layer prevents latch-up, and substrate connection to V− mandates robust decoupling (1–10 µF tantalum + 10–100 nF ceramic) on both V+ and V− pins for stable RF performance.

Key Specifications

Pinout & Package

Package: 16-pin narrow SOIC (JEDEC MS-012), body dimensions 9.80–10.00 mm × 3.80–4.00 mm × 1.35–1.75 mm height, lead pitch 1.27 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4617ESE+ and ADG612BRUZ, the DG641DY uniquely combines 500 MHz bandwidth, −87 dB crosstalk, and true dual-supply operation-enabling high-fidelity signal routing in demanding broadcast, defense, and test applications where frequency response and channel isolation are non-negotiable.

Availability

DG641DY is available at Aetrix Electronics and suitable for RGB video multiplexing, satellite receiver signal routing, and ATE channel switching requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for DG641DY 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.

The DG641DY belongs to Vishay's wideband analog switch product line, engineered specifically for high-fidelity video, RF, and instrumentation signal routing where bandwidth, linearity, and channel isolation are critical.

FAQ

What is the maximum analog signal voltage range supported by the DG641DY?

The DG641DY supports an analog signal range of −5 V to +8 V when V− = −5 V and V+ = +12 V, or 0 V to +8 V when V− = GND and V+ = +12 V. This ±5 V capability enables direct interfacing with AC-coupled video signals and RF IF stages without external clamping or level-shifting circuitry. The DG641DY's internal diode clamping protects against overvoltage, but forward current must remain below rated limits.

Does the DG641DY require external decoupling capacitors, and if so, what values are recommended?

Yes, the DG641DY requires local decoupling on both V+ and V− pins to maintain 500 MHz bandwidth and minimize supply-induced crosstalk. Vishay specifies 1–10 µF tantalum bead plus 10–100 nF ceramic or polyester capacitors placed as close as possible to each supply pin. The substrate connection to V− makes its decoupling especially critical-poor V− decoupling directly degrades off-isolation and increases charge injection in the DG641DY.

Can the DG641DY be operated from a single positive supply, and how does that affect performance?

Yes, the DG641DY can operate from a single positive supply by connecting V− to GND. However, this restricts the analog input range to 0 V to +8 V and increases on-capacitance (CS(on)), reducing bandwidth and worsening crosstalk. For optimal video linearity-especially differential phase/gain-the datasheet recommends V− ≈ −3 V. So while single-supply operation is possible, the DG641DY achieves its full 500 MHz and −87 dB specs only under dual-supply conditions.

How does the DG641DY handle bidirectional signal flow, and why is that important in video applications?

The DG641DY's DMOS switch architecture provides symmetrical on-resistance and capacitance regardless of signal direction-meaning IN→S and S→IN exhibit identical R_DS(on), CS(on), and bandwidth. This eliminates polarity-dependent distortion in AC-coupled video paths and simplifies PCB layout by removing "input/output" orientation constraints. In RGB multiplexing, it ensures consistent color channel timing and amplitude response whether routing from source to display or vice versa-critical for maintaining chroma fidelity in the DG641DY.

Is the DG641DY pin-compatible with other devices in the DG64x family, such as the DG642DY or DG643DY?

No, the DG641DY (16-pin SOIC, quad SPST) is not pin-compatible with the DG642DY (8-pin SOIC, single SPDT) or DG643DY (16-pin SOIC, dual SPDT). Their pinouts differ fundamentally: DG641DY dedicates pins to four independent EN/IN/S/D sets, while DG642DY uses shared control logic for SPDT action. Board redesign is required to substitute between them. Always verify pin mapping and truth table alignment before replacement-the DG641DY's quad SPST topology serves distinct routing functions versus the SPDT configurations.