MAX328, MAX329

Ultra-Low-Leakage, Single-Ended, Monolithic, CMOS Analog Multiplexer

 Overview   Design Resources   Ordering Info   Related Products   All   

Status Explanations for product status codes

Active: In Production.


The MAX328/MA329 are monolithic CMOS analog multiplexers. The MAX328 is a single-ended, 1-of-8 device, and the MAX329 is a differential, 2-of-8 device.

Designed to provide the lowest possible on- and off-leakages, these multiplexers switch signals from high source impedance, providing the mux operates into a high-input-impedance op amp or A/D converter. The MAX328/MAX329 are pin-for-pin replacements for the popular DG508/DG509 in these applications.

Adding an external 40kΩ resistor to each input makes the MAX328/MAX329 an excellent fault-tolerant multiplexer. Low leakage (less than 1pA at +25°C) and 2.5kΩ on-resistance allow the circuit to sustain 110V AC faults indefinitely while maintaining an error of less than 40nV for normal signals (i.e., 1pA times 40kΩ).

The MAX328/MAX329 work equally well with a single supply of 10V to 30V or dual supplies of ±5V to ±18V. They also perform well with unbalanced combinations of supply voltage, such as +12V and -5V or +5V and -15V. Low power dissipation (1.9mW with ±15V supplies) allows use in portable applications.

Data Sheet

Download this datasheet in PDF formatDownload Rev 3 (PDF, 176kB)
Send this datasheet to any email addressEmail

My Maxim: Not Logged In
By logging in to My Maxim you can subscribe to alerts for this data sheet.

Login | Register

Key Features

  • Ultra-Low Off- and On-Leakage: 1pA Typ
  • Bidirectional Operation (Use as Mux or Demux)
  • TTL and CMOS Logic Compatibility
  • Analog-Signal Range Includes Power-Supply Rails
  • Switching Speeds Less Than 1.5µs
  • Pin Compatible with DG508/DG509 and MAX358/MAX359
  • Latchup Proof Construction

Key Specifications:

Switches and Multiplexers (Mid and High Voltage)
Part Number Functions Config. Channels VSUPPLY (Single)
VSUPPLY (Single)
min max min max max max min max See Notes
MAX328  Mux 8-to-1 1 10 30 4.5 18 3500 0.01 1500 1000 5 10 1.8 $4.03 @1k
MAX329  4-to-1 2 6 $8.18 @1k
See All Switches and Multiplexers (Mid and High Voltage) (312)

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.


MAX328, MAX329: Typical Operating Circuit
Typical Operating Circuit

Notes and Comments

Ultra-low leakage

Didn't Find What You Need?

Information Index



Design Resources


Ordering Info


Related Products

Key Features
Key Specifications
Notes and Comments
  Data Sheet
Technical Documents
Evaluation Kits
Reliability Reports
  Price and Availability
Buy Online
Package Information
Lead-Free Information
  Similar Products by Function
Similar Products by Application
Evaluation Kits
Products with Similar Part Numbers
Products Used With This
Document Ref.: 19-1006 Rev 3; 2011-08-10
This page last modified: 2011-08-10