+2.7V to +5.25V, Low-Power, 10-Bit Serial ADCs in SO-8

Please check latest availability status for a specific part variant.


The MAX1242/MAX1243 are low-power, 10-bit analog-to-digital converters (ADCs) available in 8-pin packages. They operate with a single +2.7V to +5.25V supply and feature a 7.5µs successive-approximation ADC, a fast track/hold (1.5µs), an on-chip clock, and a high-speed, 3-wire serial interface.

Power consumption is only 3mW (VDD = 3V) at the 73ksps maximum sampling speed. A 2µA shutdown mode reduces power at slower throughput rates.

The MAX1242 has an internal 2.5V reference, while the MAX1243 requires an external reference. The MAX1243 accepts signals from 0V to VREF, and the reference input range includes the positive supply rail. An external clock accesses data from the 3-wire interface, which connects directly to standard microcontroller I/O ports. The interface is compatible with SPI, QSPI, and MICROWIRE®.

Excellent AC characteristics and very low power combined with ease of use and small package size make these converters ideal for remote-sensor and data-acquisition applications, or for other circuits with demanding power consumption and space requirements. The MAX1242/MAX1243 are available in 8-pin PDIP and SO packages.

MAX1242, MAX1243: Functional Diagram MAX1242, MAX1243: Functional Diagram Enlarge+

Key Features

  • +2.7V to +5.25V Single-Supply Operation
  • 10-Bit Resolution
  • Internal 2.5V Reference (MAX1242)
  • Small Footprint: 8-Pin PDIP and SO Packages
  • Low Power:
    • 3.7mW (73ksps, MAX1242)
    • 3mW (73ksps, MAX1243)
    • 66µW (1ksps, MAX1243)
    • 5µW (Power-Down Mode)
  • Internal Track/Hold
  • SPI/QSPI/MICROWIRE 3-Wire Serial Interface
  • Pin-Compatible 12-Bit Upgrades: MAX1240/MAX1241


  • Isolated Data Acquisition
  • Portable Data Logging
  • Process Control Monitoring
  • Temperature Measurement
  • Test Equipment
Part NumberResolution
Input Chan.Conv. Rate
ADC ArchitectureData BusDiff/S.E. InputInternal VREF
External VREF
External VREF
Unipolar VIN
ADCmaxnominalminmaxmaxSee Notes
MAX1242 10173SARSPIS.E. Only2.515.252.566-700.5
SOIC (N)/8
$4.24 @1k
MAX1243 -
SOIC (N)/8
$3.68 @1k
See All Precision ADCs (< 5Msps) (464)
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.

Quality and Environmental Data

Request Reliability Report for: MAX1242 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX1242ACPA
  • MAX1242ACPA+
  • MAX1242ACSA
  • MAX1242ACSA+
  • MAX1242ACSA+T
  • MAX1242ACSA-T
  • MAX1242AEPA
  • MAX1242AEPA+
  • MAX1242AESA
  • MAX1242AESA+
  • MAX1242AESA+T
  • MAX1242AESA-T
  • MAX1242AMJA
  • MAX1242BCPA
  • MAX1242BCPA+
  • MAX1242BCSA
  • MAX1242BCSA+
  • MAX1242BCSA+T
  • MAX1242BCSA-T
  • MAX1242BEPA
  • MAX1242BEPA+
  • MAX1242BESA
  • MAX1242BESA+
  • MAX1242BESA+T
  • MAX1242BESA-T
  • MAX1242BESA/V+
  • MAX1242BESA/V+T
  • MAX1242BMJA
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    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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