MM74HC245AN Equivalent & Substitute Parts

Part Overview

The MM74HC245AN is a non-inverting transceiver logic integrated circuit manufactured by onsemi, designed for 8-bit bidirectional data transfer with 3-state output capability. The device operates across a 2V to 6V supply voltage range and is housed in a 20-pin DIP package suitable for through-hole mounting applications.

The MM74HC245AN carries an obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support legacy system maintenance where this component is specified.

Key Parameters

Parameter	Value
Manufacturer Part Number	MM74HC245AN
Manufacturer	onsemi
Logic Type	Transceiver, Non-Inverting
Number of Elements	1
Number of Bits per Element	8
Output Type	3-State
Current - Output High, Low	7.8mA, 7.8mA
Voltage - Supply	2V ~ 6V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the MM74HC245AN are classified based on strict adherence to the following critical parameters:

Primary Substitution Criteria:

Logic Type: Transceiver, Non-Inverting
Number of Elements: 1
Number of Bits per Element: 8
Output Type: 3-State
Package / Case: 20-DIP (0.300", 7.62mm)
Mounting Type: Through Hole
Voltage - Supply: 2V ~ 6V

Secondary Compatibility Parameters:

Current - Output High, Low: 7.8mA, 7.8mA
Operating Temperature: -40°C ~ 85°C (TA)

Parts meeting all primary criteria and matching secondary parameters are classified as direct parametric equivalents. Parts meeting primary criteria with variations in secondary parameters are classified as functional equivalents with noted differences.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Output Current (mA)	Operating Temp (°C)	Product Status	Package
MM74HC245AN	onsemi	Transceiver, Non-Inverting	7.8 / 7.8	-40 ~ 85	Obsolete	20-DIP
CD74HC245E	Harris Corporation	Transceiver, Non-Inverting	5.2 / 5.2	-55 ~ 125	Obsolete	20-DIP
TC74HC245APF	Toshiba Semiconductor and Storage	Transceiver, Non-Inverting	7.8 / 7.8	-40 ~ 85	Active	20-DIP
SN74HC245AN	Texas Instruments	Transceiver, Non-Inverting	7.8 / 7.8	-40 ~ 85	Active	20-DIP
SN74HC245N	Texas Instruments	Transceiver, Non-Inverting	7.8 / 7.8	-40 ~ 85	Active	20-DIP
SN74HC623N	Texas Instruments	Transceiver, Non-Inverting	7.8 / 7.8	-40 ~ 85	Active	20-DIP
SN74HC645N	Texas Instruments	Transceiver, Non-Inverting	7.8 / 7.8	-40 ~ 85	Active	20-DIP

Engineering Selection Recommendations

Direct Parametric Equivalents (Recommended Primary Substitutes):

TC74HC245APF, SN74HC245AN, SN74HC245N, SN74HC623N, and SN74HC645N all meet the complete parameter specification of the MM74HC245AN. These parts share identical output current ratings (7.8mA / 7.8mA), operating temperature range (-40°C ~ 85°C), and package configuration. TC74HC245APF, SN74HC245AN, and SN74HC245N carry Active product status, ensuring ongoing availability and manufacturing support. SN74HC623N and SN74HC645N are also Active status parts from Texas Instruments.

Functional Equivalent with Parameter Variation:

CD74HC245E meets the primary substitution criteria but exhibits reduced output current (5.2mA / 5.2mA) and an extended operating temperature range (-55°C ~ 125°C). This part carries Obsolete status. Selection of CD74HC245E requires confirmation that the reduced output current specification does not compromise circuit performance in the target application.

Compliance Considerations:

SN74HC245AN, SN74HC245N, SN74HC623N, and SN74HC645N are ROHS3 Compliant. TC74HC245APF is ROHS3 Compliant. CD74HC245E is RoHS non-compliant. All listed parts carry REACH Unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can SN74HC245AN directly replace MM74HC245AN?

A: Yes. SN74HC245AN matches all critical parameters: non-inverting transceiver logic, 1 element, 8 bits per element, 3-state output, 7.8mA output current, 2V to 6V supply voltage, -40°C to 85°C operating temperature, and 20-DIP package. SN74HC245AN carries Active product status.

Q: What is the difference between SN74HC245N and SN74HC245AN?

A: Both parts are manufactured by Texas Instruments and share identical electrical specifications and package configuration. The primary difference is the Moisture Sensitivity Level designation: SN74HC245AN lists MSL as Not Applicable, while SN74HC245N also lists MSL as Not Applicable. Both are suitable substitutes for MM74HC245AN.

Q: Why is CD74HC245E listed if it has lower output current?

A: CD74HC245E meets all primary substitution criteria including logic type, element count, bit width, output type, and package. However, the output current specification is reduced to 5.2mA compared to the 7.8mA of MM74HC245AN. This part is included for applications where the reduced current capability is acceptable. Verification against circuit load requirements is necessary before selection.

Q: Are all substitute parts available in the same package?

A: Yes. All listed substitute parts are housed in 20-DIP (0.300", 7.62mm) packages with through-hole mounting configuration, matching the MM74HC245AN package specification.

Q: Which substitute part has the best long-term availability?

A: SN74HC245N carries the highest inventory level (13,752 pieces) and Active product status from Texas Instruments, indicating strong ongoing manufacturing support and supply chain availability.

Q: Is RoHS compliance a factor in part selection?

A: RoHS compliance status varies among substitutes. SN74HC245AN, SN74HC245N, SN74HC623N, SN74HC645N, and TC74HC245APF are ROHS3 Compliant. CD74HC245E is RoHS non-compliant. Selection should align with end-product regulatory requirements and customer specifications.

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