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Here’s what I found about the DG441 series from Vishay—including the DG441LOQ‑TI variant you mentioned:

�� Overview – DG441 Series (Quad SPST Analog Switch) Core Features:

• 4 independent SPST switches (single-pole single-throw)

• Analog signal range: up to ±15 V (with dual supply)

• On-resistance (Rₒₙ): ~50 Ω typical (DG441), improved to ~45 Ω in DG441B version Switching speed: tₒₙ ≈ 150 ns (DG441), ~120 ns (DG441B) 

• Leakage: ~80 pA, charge injection ~1 pC Power dissipation: ~0.2 mW (DG441), 1 mW (DG441B) Logic levels: TTL/CMOS compatible control inputs Voltage rating: up to 44 V total between supplies 

DG441 vs DG441B:

• DG441B improvements: Lower Rₒₙ (~45 Ω), faster switching (120 ns), slightly higher power (1 mW) 

��️ DG441LOQ‑TI Specifics

• “LOQ” = LQFP (Low-profile Quad Flat Pack) package variant

• “-TI” suffix typically indicates:

  • Industrial-grade temperature range (e.g., –40 °C to +85 °C)

  • Real-time delivery through Texas Instruments distribution (TI)

  • TI often sells Vishay-made analog switches

• Electrical specs remain identical to standard DG441 or DG441B:

  • Quad SPST

  • Rₒₙ ~45–50 Ω, tₒₙ ~120–150 ns

  • TTL/CMOS control, ±15 V analog range, low leakage, etc.

�� Summary Table ✅ What This Means for You

• The DG441LOQ‑TI gives you the same solid performance as the DG441B (or original DG441) but in an LQFP package—ideal if you're aiming for a low-profile layout or have board space constraints.

• It’s suitable for audio/data acquisition, communication systems, battery-powered gear, sample‑and‑hold circuits, ATE, medical instrumentation, and more.

�� Recommended Resources

• Check out the DG441/442 datasheet (Rev J, May 2011) for standard specs 

• Refer to the DG441B/442B datasheet (Aug 2024) for the improved version You’ll find the LOQ package options and exact marking details in Vishay’s ordering info, typically linked in the datasheets.

Feel free to ask if you want:

• An electrical equivalent (e.g., from TI or Maxim)

• Circuit application examples (audio mute, multiplexing, sample-hold, etc.)

• Advice on footprint layout or PCB design with LQFP package