MAX921EPA Equivalent & Substitute Parts

Part Overview

The MAX921EPA is a CMOS/TTL comparator with integrated voltage reference in an 8-DIP package, manufactured by Analog Devices Inc./Maxim Integrated. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The MAX921EPA provides single-element comparison functionality with combined CMOS and TTL output capability, suitable for applications requiring precision voltage comparison with integrated reference generation.

Substiute Parts

MAX921EPA

Analog Devices Inc./Maxim IntegratedIn Stock: 3374MAX921EPA Datasheet

Current PartRFQ

MAX921EPA+

Analog Devices Inc./Maxim IntegratedIn Stock: 1370MAX921EPA+ Datasheet

DirectRFQ

LTC1440CN8#PBF

Analog Devices Inc.In Stock: 943LTC1440CN8#PBF Datasheet

MFR RecommendedRFQ

LTC1440IN8#PBF

Analog Devices Inc.In Stock: 1006LTC1440IN8#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the MAX921EPA is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

• Package type: 8-DIP (0.300", 7.62mm) through-hole mounting
• Functional type: Comparator with integrated voltage reference
• Output configuration: CMOS/TTL compatible
• Number of elements: Single comparator
• Hysteresis: 50mV
• CMRR/PSRR: 80dB minimum

Acceptable Variation Parameters:

• Supply voltage range: Minimum range of 2V ~ 11V for single supply or ±1V ~ 5.5V for dual supply
• Propagation delay: Maximum 15µs (MAX921EPA specifies 12µs maximum)
• Quiescent current: Maximum 4.4µA (MAX921EPA specifies 5µA maximum)
• Output current: Minimum 40mA (MAX921EPA specifies 50mA typical)
• Operating temperature: Minimum range of 0°C ~ 70°C (MAX921EPA specifies -40°C ~ 85°C)

Substitutes are grouped into two categories: direct packaging equivalents and manufacturer-recommended alternatives with minor performance variations within acceptable engineering tolerances.

Parameter Comparison

Engineering Selection Recommendations

MAX921EPA+ (Direct Successor) The MAX921EPA+ is the active production equivalent from the same manufacturer with identical electrical specifications and packaging. This part maintains full parameter compatibility with the obsolete MAX921EPA, including supply voltage range, propagation delay, and operating temperature range. Selection of MAX921EPA+ is appropriate for direct replacement in existing designs without circuit modification.

LTC1440IN8#PBF (Extended Temperature Alternative) The LTC1440IN8#PBF provides full functional equivalence with extended operating temperature range (-40°C ~ 85°C) matching the MAX921EPA. This part exhibits minor performance variations: 3µs longer propagation delay (15µs maximum) and 10mA lower typical output current (40mA). The LTC1440IN8#PBF maintains ROHS3 compliance and is suitable for applications requiring the full temperature range of the original part.

LTC1440CN8#PBF (Commercial Temperature Alternative) The LTC1440CN8#PBF is functionally equivalent with restricted operating temperature range (0°C ~ 70°C). This part is appropriate only for applications operating within commercial temperature limits. Electrical performance is identical to LTC1440IN8#PBF. Selection requires confirmation that the design does not require extended temperature operation below 0°C or above 70°C.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original MAX921EPA specification.

Frequently Asked Questions (FAQ)

Q: Can MAX921EPA+ be used as a direct replacement for MAX921EPA? A: Yes. The MAX921EPA+ is the active production equivalent with identical electrical specifications, package type, and operating temperature range. No circuit modifications are required.

Q: What are the key differences between MAX921EPA and LTC1440 series parts? A: The LTC1440 series exhibits three parameter variations: (1) supply voltage minimum reduced from 2.5V to 2V for single supply and ±1.25V to ±1V for dual supply, (2) propagation delay increased from 12µs to 15µs maximum, and (3) typical output current reduced from 50mA to 40mA. All other parameters remain equivalent.

Q: Is LTC1440CN8#PBF suitable for all applications using MAX921EPA? A: No. The LTC1440CN8#PBF operates only within 0°C ~ 70°C temperature range. Applications requiring operation below 0°C or above 70°C must use MAX921EPA+, LTC1440IN8#PBF, or maintain the original MAX921EPA inventory.

Q: Are all substitute parts RoHS compliant? A: Yes. MAX921EPA+, LTC1440CN8#PBF, and LTC1440IN8#PBF are all ROHS3 compliant, matching the original MAX921EPA specification.

Q: Can the 3µs propagation delay difference of LTC1440 parts affect circuit timing? A: This depends on application-specific timing requirements. The LTC1440 series maximum propagation delay of 15µs versus MAX921EPA maximum of 12µs represents a 25% increase. Applications with critical timing margins below 3µs must evaluate this parameter against design specifications.

Q: What packaging options are available for these substitute parts? A: All listed parts are supplied in 8-DIP (0.300", 7.62mm) through-hole packages. No surface-mount alternatives are provided in this substitution group.