DM74ALS245ASJ Equivalent & Substitute Parts

Part Overview

The DM74ALS245ASJ 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 within a 4.5V to 5.5V supply voltage range and is housed in a 20-SOP package. The part is currently classified as obsolete, making equivalent substitutes necessary for ongoing design requirements and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	DM74ALS245ASJ
Manufacturer	onsemi
Series	74ALS
Logic Type	Transceiver, Non-Inverting
Number of Elements	1
Number of Bits per Element	8
Output Type	3-State
Current - Output High, Low	15mA, 24mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Surface Mount
Package / Case	20-SOIC (0.209", 5.30mm Width)
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the DM74ALS245ASJ is determined by strict equivalence across 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
Current ratings: 15mA (output high), 24mA (output low)
Supply voltage range: 4.5V ~ 5.5V
Operating temperature: 0°C ~ 70°C
Series classification: 74ALS
Mounting type: Surface Mount
Moisture sensitivity level: 1 (Unlimited)

Substitute parts are grouped into two categories based on package configuration: 20-SO (0.209" width) and 20-SOIC (0.295" width). All listed substitutes maintain identical electrical specifications and functional performance while differing only in packaging format and supplier availability.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements / Bits	Output Type	Current (High/Low)	Supply Voltage	Operating Temp	Package	Product Status	RoHS Status
DM74ALS245ASJ	onsemi	Transceiver, Non-Inverting	1 / 8	3-State	15mA, 24mA	4.5V ~ 5.5V	0°C ~ 70°C	20-SOP (0.209")	Obsolete	REACH Unaffected
SN74ALS245ANSR	Texas Instruments	Transceiver, Non-Inverting	1 / 8	3-State	15mA, 24mA	4.5V ~ 5.5V	0°C ~ 70°C	20-SO (0.209")	Active	ROHS3 Compliant
SN74ALS245A-1DW	Texas Instruments	Transceiver, Non-Inverting	1 / 8	3-State	15mA, 24mA	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC (0.295")	Last Time Buy	ROHS3 Compliant
SN74ALS245A-1DWR	Texas Instruments	Transceiver, Non-Inverting	1 / 8	3-State	15mA, 24mA	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC (0.295")	Active	ROHS3 Compliant
SN74ALS245A-1NSR	Texas Instruments	Transceiver, Non-Inverting	1 / 8	3-State	15mA, 24mA	4.5V ~ 5.5V	0°C ~ 70°C	20-SO (0.209")	Active	ROHS3 Compliant
SN74ALS245ADW	Texas Instruments	Transceiver, Non-Inverting	1 / 8	3-State	15mA, 24mA	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC (0.295")	Last Time Buy	ROHS3 Compliant
SN74ALS245ADWR	Texas Instruments	Transceiver, Non-Inverting	1 / 8	3-State	15mA, 24mA	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC (0.295")	Active	ROHS3 Compliant

Engineering Selection Recommendations

For applications currently using the DM74ALS245ASJ, Texas Instruments SN74ALS245 series parts provide direct functional equivalence. Selection between available substitutes should prioritize product status and compliance requirements:

Active Status Parts (Recommended for New Designs):

SN74ALS245ANSR: 20-SO package, active status, ROHS3 compliant, tape & reel packaging
SN74ALS245A-1DWR: 20-SOIC package, active status, ROHS3 compliant, tape & reel packaging
SN74ALS245A-1NSR: 20-SO package, active status, ROHS3 compliant, tape & reel packaging
SN74ALS245ADWR: 20-SOIC package, active status, ROHS3 compliant, cut tape & digi-reel packaging

Last Time Buy Parts (Limited Availability):

SN74ALS245A-1DW: 20-SOIC package, tube packaging, ROHS3 compliant
SN74ALS245ADW: 20-SOIC package, tube packaging, ROHS3 compliant

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with current environmental standards.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS245ANSR directly replace DM74ALS245ASJ? A: Yes, electrically and functionally. Both are 74ALS series non-inverting transceivers with identical electrical specifications. The primary difference is package width: SN74ALS245ANSR uses 20-SO (0.209" width) while DM74ALS245ASJ uses 20-SOP (0.209" width). Verify PCB footprint compatibility before substitution.

Q: What is the difference between 20-SO and 20-SOIC packages? A: Both are surface-mount packages with 20 pins. The 20-SO package has a 0.209" width, while 20-SOIC has a 0.295" width. These are physically different and require different PCB footprints. Confirm your design's package requirement before selecting a substitute.

Q: Are all Texas Instruments SN74ALS245 variants electrically interchangeable? A: Yes. All listed SN74ALS245 variants (ANSR, A-1DW, A-1DWR, A-1NSR, ADW, ADWR) share identical electrical specifications: 1 element, 8 bits per element, 3-state output, 15mA/24mA current ratings, and 4.5V to 5.5V supply voltage. Differences exist only in packaging format and supplier delivery method.

Q: What does "Last Time Buy" status mean? A: Last Time Buy indicates the manufacturer will no longer produce the part after a specified date. SN74ALS245A-1DW and SN74ALS245ADW are in this status. For long-term production requirements, select parts with Active status.

Q: Are these parts RoHS compliant? A: All Texas Instruments SN74ALS245 substitutes are ROHS3 compliant. The original onsemi DM74ALS245ASJ is REACH unaffected. All parts meet current environmental compliance requirements.

Q: What packaging options are available for continuous supply? A: For active status parts with standard packaging: SN74ALS245ANSR and SN74ALS245A-1NSR (20-SO, tape & reel), SN74ALS245A-1DWR (20-SOIC, tape & reel), and SN74ALS245ADWR (20-SOIC, cut tape & digi-reel).

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