0.5Ω/0.8Ω Low-Voltage, Dual SPDT Analog Switches in UCSP

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The MAX4684/MAX4685 low on-resistance (RON), low-voltage, dual single-pole/double-throw (SPDT) analog switches operate from a single +1.8V to +5.5V supply. The MAX4684 features a 0.5Ω (max) RON for its NC switch and a 0.8Ω (max) RON for its NO switch at a +2.7V supply. The MAX4685 features a 0.8Ω max on-resistance for both NO and NC switches at a +2.7V supply.

Both parts feature break-before-make switching action (2ns) with tON = 50ns and tOFF = 40ns at +3V. The digital logic inputs are 1.8V logic-compatible with a +2.7V to +3.3V supply.

The MAX4684/MAX4685 are packaged in the chipscale package (UCSP™), significantly reducing the required PC board area. The chip occupies only a 2.0mm x 1.50mm area. The 4 x 3 array of solder bumps are spaced with a 0.5mm bump pitch.
MAX4684, MAX4685: Pin Configuration MAX4684, MAX4685: Pin Configuration Enlarge+

Key Features

  • 12-Bump, 0.5mm-Pitch UCSP
  • NC Switch RON
    • 0.5Ω max (+2.7V Supply) (MAX4684)
    • 0.8Ω max (+2.7V Supply) (MAX4685)
  • NO Switch RON
    • 0.8Ω max (+2.7V Supply)
  • RON Match Between Channels
    • 0.06Ω (max)
  • RON Flatness Over Signal Range
    • 0.15Ω (max)
  • +1.8V to +5.5V Single-Supply Operation
  • Rail-to-Rail Signal Handling
  • 1.8V Logic Compatibility
  • Low Crosstalk: -68dB (100kHz)
  • High Off-Isolation: -64dB (100kHz)
  • THD: 0.03%
  • 50nA (max) Supply Current
  • Low Leakage Currents
    • 1nA (max) at TA = +25°C


  • Audio/Video Signal Routing
  • Battery-Operated Equipment
  • Cell Phones
  • Communications Circuits
  • Modems
  • MP3 Players
  • PCMCIA Cards
  • Power Routing
  • Relay Replacement
  • Speaker-Headset Switching

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Technical Documents

App Note 5299 Selecting the Right CMOS Analog Switch
Product Reliability Reports: MAX4684.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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