DM74LS245WM Equivalent & Substitute Parts

Part Overview

The DM74LS245WM is a non-inverting transceiver logic IC manufactured by onsemi, designed for 8-bit bidirectional data transfer applications. This device features 1 element with 8 bits per element and operates within a 4.75V to 5.25V supply voltage range. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring this functional category.

Key Parameters

Parameter	Value
Manufacturer Part Number	DM74LS245WM
Manufacturer	onsemi
Series	74LS
Logic Type	Transceiver, Non-Inverting
Number of Elements	1
Number of Bits per Element	8
Package / Case	20-SOIC (0.295", 7.50mm Width)
Voltage - Supply	4.75V ~ 5.25V
Current - Output High, Low	15mA, 24mA
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the DM74LS245WM is determined by strict alignment of the following electrical and mechanical parameters:

Logic Function: Transceiver, Non-Inverting configuration
Element and Bit Configuration: 1 element, 8 bits per element
Supply Voltage Range: 4.75V ~ 5.25V
Output Current Specifications: 15mA (high), 24mA (low)
Operating Temperature Range: 0°C ~ 70°C
Package Type: 20-SOIC surface mount
Series Classification: 74LS logic family

Substitute parts must maintain identical electrical performance and mechanical compatibility within these parameters. Package width variations and output type differences (3-State vs. standard output) are noted where applicable but do not preclude functional substitution when circuit design accommodates these characteristics.

Parameter Comparison

Parameter	DM74LS245WM	SN74LS245DWR	SN74LS245DW	SN74LS245NSR
Manufacturer	onsemi	Texas Instruments	onsemi	Texas Instruments
Series	74LS	74LS	74LS	74LS
Logic Type	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting
Number of Elements	1	1	1	1
Number of Bits per Element	8	8	8	8
Output Type	Standard Output	3-State Output	3-State Output	3-State Output
Voltage - Supply	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Current - Output High, Low	15mA, 24mA	15mA, 24mA	15mA, 24mA	15mA, 24mA
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.209", 5.30mm Width)
Product Status	Obsolete	Active	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

SN74LS245DWR (Texas Instruments) is the primary substitute for new designs and ongoing production. This part maintains full electrical and mechanical compatibility with the DM74LS245WM while offering active product status and ROHS3 compliance. The 3-State output configuration provides enhanced circuit flexibility for bus-oriented applications.

SN74LS245NSR (Texas Instruments) serves as an alternative substitute with identical electrical specifications and active product status. This part features a narrower 20-SOIC package (0.209" width versus 0.295"), which may require PCB layout verification for mechanical fit. ROHS3 compliance and high inventory availability support production continuity.

SN74LS245DW (onsemi) provides functional equivalence with matching package dimensions and electrical parameters. However, obsolete product status limits its suitability for new designs. This part is suitable only for legacy system maintenance where existing inventory is available.

Frequently Asked Questions (FAQ)

Q: Can SN74LS245DWR directly replace DM74LS245WM in existing designs?

A: Yes. Both parts share identical supply voltage (4.75V ~ 5.25V), output current specifications (15mA, 24mA), operating temperature range (0°C ~ 70°C), and 20-SOIC package dimensions (0.295", 7.50mm width). The 3-State output in the SN74LS245DWR is functionally compatible with standard output applications.

Q: What is the difference between the 20-SOIC packages in SN74LS245DWR and SN74LS245NSR?

A: SN74LS245DWR uses a 20-SOIC package with 0.295" width, matching the original DM74LS245WM footprint. SN74LS245NSR uses a narrower 20-SOIC package with 0.209" width. PCB layout compatibility must be verified before substitution of SN74LS245NSR.

Q: Are there compliance differences between substitute parts?

A: SN74LS245DWR and SN74LS245NSR are both ROHS3 compliant, while DM74LS245WM and SN74LS245DW are RoHS non-compliant. For applications requiring RoHS compliance, Texas Instruments substitutes are required.

Q: Why do substitute parts show 3-State output while the original shows standard output?

A: The 3-State output configuration is a functional enhancement that maintains backward compatibility. Circuits designed for standard output operation function identically with 3-State output devices when the output enable control is properly managed.

Q: Which substitute part should be selected for new production?

A: SN74LS245DWR is recommended for new production due to active product status, ROHS3 compliance, matching package dimensions, and established supply chain availability through Texas Instruments.

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