DM74ALS245AN Equivalent & Substitute Parts

Part Overview

The DM74ALS245AN is a non-inverting transceiver logic integrated circuit manufactured by onsemi, designed for 8-bit bidirectional data transfer with 3-state output capability. Operating within a 4.5V to 5.5V supply voltage range, this component is classified as obsolete by the manufacturer. Due to its obsolete status and limited availability from the original manufacturer, equivalent substitute parts from active product lines are necessary to maintain design continuity and ensure long-term component sourcing reliability.

Key Parameters

Parameter	Value
Logic Type	Transceiver, Non-Inverting
Number of Elements	1
Number of Bits per Element	8
Output Type	3-State
Current - Output High	15mA
Current - Output Low	24mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Through Hole
Package / Case	20-DIP (0.300", 7.62mm)
Supplier Device Package	20-PDIP

Substitute Part Grouping Explanation

Substitution eligibility for the DM74ALS245AN is determined by strict adherence to the following electrical and mechanical parameters:

Logic Type: Transceiver, Non-Inverting
Number of Elements: 1
Number of Bits per Element: 8
Output Type: 3-State
Voltage - Supply: 4.5V ~ 5.5V
Operating Temperature: 0°C ~ 70°C (TA)
Package / Case: 20-DIP (0.300", 7.62mm)
Mounting Type: Through Hole

All substitute parts listed maintain these core parameters. Variations in output current specifications (15mA/24mA or 15mA/16mA) remain within acceptable operational ranges for standard logic applications. Parts are grouped by their base product number designation, indicating functional equivalence within the 74ALS transceiver family.

Parameter Comparison

Part Number	Manufacturer	Series	Logic Type	Output Current (High/Low)	Supply Voltage	Operating Temp	Package	Product Status	RoHS Status
DM74ALS245AN	onsemi	74ALS	Transceiver, Non-Inverting	15mA / 24mA	4.5V ~ 5.5V	0°C ~ 70°C	20-DIP	Obsolete	REACH Unaffected
SN74ALS245AN	Texas Instruments	74ALS	Transceiver, Non-Inverting	15mA / 24mA	4.5V ~ 5.5V	0°C ~ 70°C	20-DIP	Active	ROHS3 Compliant
SN74ALS1245AN	Texas Instruments	74ALS	Transceiver, Non-Inverting	15mA / 16mA	4.5V ~ 5.5V	0°C ~ 70°C	20-DIP	Active	ROHS3 Compliant
SN74ALS245A-1N	Texas Instruments	74ALS	Transceiver, Non-Inverting	15mA / 24mA	4.5V ~ 5.5V	0°C ~ 70°C	20-DIP	Active	ROHS3 Compliant
SN74ALS623AN	Texas Instruments	74ALS	Transceiver, Non-Inverting	15mA / 24mA	4.5V ~ 5.5V	0°C ~ 70°C	20-DIP	Active	ROHS3 Compliant
SN74ALS645A-1N	Texas Instruments	74ALS	Transceiver, Non-Inverting	15mA / 24mA	4.5V ~ 5.5V	0°C ~ 70°C	20-DIP	Active	ROHS3 Compliant
SN74ALS645AN	Texas Instruments	74ALS	Transceiver, Non-Inverting	15mA / 24mA	4.5V ~ 5.5V	0°C ~ 70°C	20-DIP	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and mechanical compatibility with the DM74ALS245AN within the specified operating parameters. Selection among substitute options should prioritize parts with active product status and current manufacturing support.

SN74ALS245AN from Texas Instruments represents the direct functional equivalent with identical output current specifications (15mA/24mA) and active product status. This part is ROHS3 compliant and maintains continuous manufacturing availability.

SN74ALS1245AN offers an alternative with marginally reduced output low current (16mA versus 24mA), which remains within acceptable operational ranges for standard logic applications. This part is also ROHS3 compliant and actively manufactured.

SN74ALS245A-1N, SN74ALS623AN, SN74ALS645A-1N, and SN74ALS645AN are parametric equivalents with identical electrical specifications to the primary substitute. All are ROHS3 compliant and actively produced. Selection among these variants should be based on inventory availability and lead time requirements.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS1245AN be used as a direct replacement for DM74ALS245AN?

A: Yes. SN74ALS1245AN maintains all critical electrical parameters including logic type, bit width, supply voltage, and operating temperature range. The output low current specification of 16mA is lower than the original 24mA but remains within acceptable operational limits for standard logic applications.

Q: What is the primary difference between SN74ALS245AN and SN74ALS245A-1N?

A: Both parts are functionally equivalent with identical electrical specifications. The designation suffix (-1N versus AN) indicates different manufacturing date codes and packaging batches from Texas Instruments. Electrical performance and pin compatibility are identical.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All Texas Instruments substitute parts listed (SN74ALS245AN, SN74ALS1245AN, SN74ALS245A-1N, SN74ALS623AN, SN74ALS645A-1N, and SN74ALS645AN) are ROHS3 compliant. The original onsemi DM74ALS245AN is REACH unaffected but predates current RoHS certification standards.

Q: Is the 20-DIP package identical across all parts?

A: Yes. All parts use the 20-DIP (0.300", 7.62mm) package with 20-PDIP supplier device package designation. Pin configuration and physical dimensions are identical, enabling direct socket substitution.

Q: Which substitute part has the highest current availability?

A: SN74ALS1245AN has the highest inventory level at 5,212 pieces. SN74ALS245AN follows with 3,840 pieces. Both are suitable for immediate procurement.

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