Vishay Siliconix DG642DY-T1

Overview

DG642DY-T1 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, and -85 dB crosstalk at 5 MHz, enabling high-fidelity RGB and composite video switching in broadcast and test equipment.

For engineers reviewing the DG642DY-T1 datasheet, DG642DY-T1 pinout, DG642DY-T1 application, or DG642DY-T1 equivalent, key selection criteria include bidirectional signal handling up to ±5 V, TTL-compatible control logic, 100 mA continuous drain-source current, fast 60 ns turn-on time, and SOIC-8 package compatibility with high-frequency PCB layout requirements.

Technical Context

The DG642DY-T1 uses Vishay's proprietary D/CMOS process to achieve low R_DS(on) and high bandwidth while maintaining TTL input compatibility across its full ±3 V to ±15 V dual-supply range. Its symmetrical source/drain terminals support true bidirectional analog signal flow without polarity constraints.

Internal epitaxial isolation prevents latch-up, and an on-chip regulator ensures stable logic threshold operation (V_INH ≥ 2.4 V, V_INL ≤ 0.8 V) regardless of supply voltage. The device blocks signals up to 14 V_p-p when off and tolerates analog inputs extending to V− − 0.3 V or V+ + 0.3 V via internal clamping diodes.

Key Specifications

Pinout & Package

Package: 8-pin narrow SOIC (MS-012), body size 4.9 mm × 3.9 mm × 1.5 mm, lead pitch 1.27 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4682EUA+ and ADG774BRMZ, the DG642DY-T1 uniquely combines 500 MHz bandwidth, ±5 V analog range, and 5 Ω R_DS(on) in an industry-standard SOIC-8-making it the only option for high-fidelity video routing without redesigning signal chain gain stages or adding level-shifting circuitry.

Availability

DG642DY-T1 is available at Aetrix Electronics and suitable for RGB video multiplexing, RF signal routing, ATE channel selection, and radar pulse modulation requiring stable component supply and long-term production continuity.

Supply support for DG642DY-T1 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-performance analog switches, MOSFETs, and precision resistors for demanding industrial and communications applications.

The DG642DY-T1 belongs to Vishay's DG64x family of wideband video switches, engineered specifically for high-fidelity analog signal routing in broadcast infrastructure, test instrumentation, and defense electronics where bandwidth, linearity, and isolation are non-negotiable.

FAQ

What is the maximum analog signal voltage range supported by the DG642DY-T1?

The DG642DY-T1 supports analog signals from V− − 0.3 V to V+ + 0.3 V. With standard supplies of V+ = 15 V and V− = −3 V, this enables a full ±5 V signal swing. The device clamps overvoltage conditions via internal diodes, but forward current must remain below 20 mA to avoid damage. This range makes DG642DY-T1 suitable for professional video systems operating at ±5 V levels.

Does the DG642DY-T1 require both positive and negative supplies to operate?

No-the DG642DY-T1 operates from a single positive supply (V+ only) with V− tied to GND. However, using a negative supply (e.g., V− = −3 V) improves video linearity, reduces on-capacitance, and enables true bipolar signal handling. The DG642DY-T1's on-chip regulator maintains TTL compatibility across all supply configurations, so control logic remains unchanged whether using single or dual supplies.

Can the DG642DY-T1 be used in RF applications above 100 MHz?

Yes-the DG642DY-T1 is characterized for 500 MHz bandwidth into 50 Ω, making it suitable for L-band RF routing (e.g., 950–2150 MHz satellite IF signals). Its low crosstalk (−85 dB at 5 MHz) and high off-isolation (−63 dB) ensure minimal interference between active and inactive paths. For optimal RF performance, follow Vishay's layout guidelines: use 50 Ω impedance-controlled traces, ground-plane separation, and local 0.1 µF + 10 µF decoupling on V+ and V− pins.

What is the thermal derating behavior of the DG642DY-T1 above 75 °C?

The DG642DY-T1 derates linearly at 6 mW/°C above 75 °C ambient temperature. Its SOIC-8 package has a rated power dissipation of 300 mW at 75 °C. At 105 °C ambient, maximum allowable power drops to 120 mW. This derating applies to total package power (I+ × V+ + |I−| × |V−|). Engineers must verify junction temperature using θ_JA = 125 °C/W and ensure T_J stays below 150 °C in continuous operation.

How does charge injection affect system accuracy when using the DG642DY-T1 in sample-and-hold circuits?

The DG642DY-T1 exhibits −40 pC typical charge injection, which induces a voltage step ΔV = Q/C_L on the hold capacitor. With a 1000 pF load (as tested), this yields a 40 mV error-significant in 12-bit+ systems. To mitigate this, place a small series resistor (10–50 Ω) between DG642DY-T1's output and the hold capacitor, or use correlated double sampling. Charge injection is supply- and temperature-stable, allowing calibrated correction in precision instrumentation using DG642DY-T1.