MM74HC245ASJ Equivalent & Substitute Parts

Part Overview

The MM74HC245ASJ is a non-inverting transceiver logic IC manufactured by onsemi, featuring 1 element with 8 bits per element and 3-state output capability. This component operates across a 2V to 6V supply voltage range and is housed in a 20-SOP package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design requirements and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	MM74HC245ASJ
Manufacturer	onsemi
Series	74HC
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-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the MM74HC245ASJ is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Parameters:

Logic Type: Transceiver, Non-Inverting
Number of Elements: 1
Number of Bits per Element: 8
Output Type: 3-State
Voltage - Supply: 2V ~ 6V
Current - Output High, Low: 7.8mA, 7.8mA
Operating Temperature: -40°C ~ 85°C (TA)
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Package Considerations: Substitutes are grouped by package type. The MM74HC245ASJ uses a 20-SOIC (0.209", 5.30mm Width) package. Equivalent parts may use alternative 20-pin surface mount packages (20-SOIC, 20-SO, 20-SOP) with compatible pinouts and mechanical dimensions.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Output Current (mA)	Supply Voltage	Operating Temp (°C)	Package	Product Status	RoHS Status
MM74HC245ASJ	onsemi	Transceiver, Non-Inverting	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-SOIC (0.209", 5.30mm)	Obsolete	ROHS3 Compliant
CD74HC245M96	Texas Instruments	Transceiver, Non-Inverting	5.2 / 5.2	2V ~ 6V	-55 ~ 125	20-SOIC (0.295", 7.50mm)	Active	ROHS3 Compliant
SN74HC245DW	Texas Instruments	Transceiver, Non-Inverting	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-SOIC (0.295", 7.50mm)	Discontinued at DiGi Electronics	ROHS3 Compliant
SN74HC245DWR	Texas Instruments	Transceiver, Non-Inverting	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-SOIC (0.295", 7.50mm)	Active	ROHS3 Compliant
SN74HC245NSR	Texas Instruments	Transceiver, Non-Inverting	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-SOIC (0.209", 5.30mm)	Active	ROHS3 Compliant
SN74HC245NS	Texas Instruments	Transceiver, Non-Inverting	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-SOIC (0.209", 5.30mm)	Discontinued at DiGi Electronics	ROHS3 Compliant
SN74HC645ANS	Texas Instruments	Transceiver, Non-Inverting	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-SOIC (0.209", 5.30mm)	Active	ROHS3 Compliant
SN74HC645NS	Texas Instruments	Transceiver, Non-Inverting	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-SOIC (0.209", 5.30mm)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

SN74HC245DWR and SN74HC245NSR are the preferred substitutes for the MM74HC245ASJ. Both parts maintain identical electrical specifications (7.8mA output current, -40°C to 85°C operating range, 2V to 6V supply voltage) and are manufactured by Texas Instruments with active product status. SN74HC245DWR uses a 20-SOIC (0.295", 7.50mm) package, while SN74HC245NSR maintains the original 20-SOIC (0.209", 5.30mm) package footprint. Both are ROHS3 compliant with MSL 1 rating.

Alternative Substitutes:

SN74HC245NS and SN74HC645ANS/SN74HC645NS provide functional equivalence with matching electrical parameters and package compatibility. However, SN74HC245NS is discontinued at DiGi Electronics, limiting long-term availability. SN74HC645ANS and SN74HC645NS are active products suitable for new designs.

Extended Temperature Range Option:

CD74HC245M96 offers an extended operating temperature range (-55°C to 125°C) compared to the original specification (-40°C to 85°C). Output current is reduced to 5.2mA per line. This part uses a larger 20-SOIC (0.295", 7.50mm) package and is suitable for applications requiring enhanced thermal performance.

Frequently Asked Questions (FAQ)

Q: Can SN74HC245DWR directly replace MM74HC245ASJ in existing designs?

A: SN74HC245DWR is electrically equivalent with identical output current (7.8mA), supply voltage range (2V to 6V), and operating temperature (-40°C to 85°C). The primary difference is package width: SN74HC245DWR uses 20-SOIC (0.295", 7.50mm) versus the original 20-SOIC (0.209", 5.30mm). PCB layout verification is required to confirm package compatibility.

Q: What is the difference between SN74HC245DWR and SN74HC245NSR?

A: Both parts are electrically identical with matching output current and operating specifications. SN74HC245DWR uses a 20-SOIC (0.295", 7.50mm) package, while SN74HC245NSR uses a 20-SOIC (0.209", 5.30mm) package. Selection depends on PCB footprint requirements and available board space.

Q: Why does CD74HC245M96 have lower output current (5.2mA vs 7.8mA)?

A: CD74HC245M96 is a different device variant with reduced output current specifications. While electrically functional as a transceiver, the lower current rating may affect drive capability in applications requiring maximum output current. This part is suitable only when the reduced current specification meets application requirements.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original MM74HC245ASJ specifications.

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

A: SN74HC245DWR and SN74HC645ANS/SN74HC645NS are active products with the highest availability. SN74HC245NS and SN74HC245DW are discontinued at DiGi Electronics and should not be selected for new designs requiring long-term supply assurance.

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