74LCX245WM Equivalent & Substitute Parts

Part Overview

The 74LCX245WM is a non-inverting transceiver logic IC manufactured by onsemi, featuring 1 element with 8 bits per element and 3-state output capability in a 20-SOIC package. This part operates across a 2V to 3.6V supply voltage range with output current ratings of 24mA for both high and low states. The 74LCX245WM is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

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, Low	24mA, 24mA
Voltage - Supply	2V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74LCX245WM is determined by the following critical parameters: logic type (transceiver, non-inverting), element and bit configuration (1 element, 8 bits per element), output type (3-state), output current capability (24mA minimum for both high and low states), package type (20-SOIC), and mounting method (surface mount). Supply voltage range and operating temperature range define the operational envelope within which substitutes must function. Parts are grouped into three categories based on their relationship to the original specification:

Direct Substitutes: Parts with identical or overlapping supply voltage ranges (1.65V ~ 3.6V or 2V ~ 3.6V) and compatible temperature ratings, maintaining full pin-for-pin compatibility.

Extended-Range Substitutes: Parts with wider supply voltage ranges (2V ~ 5.5V) that encompass the original specification, offering broader operational flexibility while maintaining all functional parameters.

Package Variant Substitutes: Parts with identical electrical specifications but different package widths (20-SO at 0.209" versus 20-SOIC at 0.295") or packaging formats (tube, cut tape, tape & reel).

Parameter Comparison

Part Number	Manufacturer	Series	Voltage - Supply	Operating Temperature	Package / Case	Current - Output High, Low	Product Status	MSL
74LCX245WM	onsemi	74LCX	2V ~ 3.6V	-40°C ~ 85°C	20-SOIC (0.295", 7.50mm)	24mA, 24mA	Obsolete	1 (Unlimited)
MC74LCX245DWG	onsemi	74LCX	2V ~ 5.5V	-55°C ~ 125°C	20-SOIC (0.295", 7.50mm)	24mA, 24mA	Active	3 (168 Hours)
MC74LCX245DWR2G	onsemi	74LCX	2V ~ 5.5V	-55°C ~ 125°C	20-SOIC (0.295", 7.50mm)	24mA, 24mA	Active	3 (168 Hours)
SN74LVC245ADW	Texas Instruments	74LVC	1.65V ~ 3.6V	-40°C ~ 125°C	20-SOIC (0.295", 7.50mm)	24mA, 24mA	Active	1 (Unlimited)
74LVC245AD,118	Nexperia USA Inc.	74LVC	1.2V ~ 3.6V	-40°C ~ 125°C	20-SOIC (0.295", 7.50mm)	24mA, 24mA	Active	1 (Unlimited)
74LVCH245AD,118	Nexperia USA Inc.	74LVCH	1.2V ~ 3.6V	-40°C ~ 125°C	20-SOIC (0.295", 7.50mm)	24mA, 24mA	Active	1 (Unlimited)
SN74LVC245ADWR	Texas Instruments	74LVC	1.65V ~ 3.6V	-40°C ~ 125°C	20-SOIC (0.295", 7.50mm)	24mA, 24mA	Active	1 (Unlimited)
SN74LVC245ANS	Texas Instruments	74LVC	1.65V ~ 3.6V	-40°C ~ 125°C	20-SOIC (0.209", 5.30mm)	24mA, 24mA	Active	1 (Unlimited)
SN74LVC245ANSR	Texas Instruments	74LVC	1.65V ~ 3.6V	-40°C ~ 125°C	20-SOIC (0.209", 5.30mm)	24mA, 24mA	Active	1 (Unlimited)
SN74LVCH245ADW	Texas Instruments	74LVCH	1.65V ~ 3.6V	-40°C ~ 125°C	20-SOIC (0.295", 7.50mm)	24mA, 24mA	Active	1 (Unlimited)
SN74LVCH245ADWR	Texas Instruments	74LVCH	1.65V ~ 3.6V	-40°C ~ 125°C	20-SOIC (0.295", 7.50mm)	24mA, 24mA	Active	1 (Unlimited)

Engineering Selection Recommendations

All substitute parts listed maintain full functional equivalence to the 74LCX245WM across the critical parameters of logic type, element count, bit configuration, output type, and output current capability. All substitutes are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

For applications requiring direct replacement with identical supply voltage specifications (2V ~ 3.6V), the MC74LCX245DWG and MC74LCX245DWR2G from onsemi provide extended temperature range operation (-55°C ~ 125°C) while maintaining the same 20-SOIC package footprint. These parts are active products with established supply chains.

For applications operating within 1.65V ~ 3.6V supply range, the SN74LVC245ADW, SN74LVC245ADWR, SN74LVC245ANS, and SN74LVC245ANSR from Texas Instruments offer active product status with MSL 1 rating. The ADWR and ANSR variants are available in cut tape and tape & reel packaging formats suitable for high-volume production.

For applications requiring extended supply voltage tolerance (1.2V ~ 3.6V), the 74LVC245AD,118 and 74LVCH245AD,118 from Nexperia USA Inc. provide the broadest input voltage range while maintaining all other specifications. These parts are active with unlimited moisture sensitivity rating.

The SN74LVCH245ADW and SN74LVCH245ADWR from Texas Instruments represent the 74LVCH series variant, offering identical electrical performance with active product status and MSL 1 rating in the standard 20-SOIC package.

Frequently Asked Questions (FAQ)

Q: Can the 74LCX245WM be directly replaced with SN74LVC245ADWR?

A: Yes. Both parts maintain identical logic type (transceiver, non-inverting), element and bit configuration (1 element, 8 bits), output type (3-state), output current (24mA), and package footprint (20-SOIC, 0.295" width). The SN74LVC245ADWR operates within the original supply voltage range (1.65V ~ 3.6V encompasses 2V ~ 3.6V) and offers extended temperature range (-40°C ~ 125°C). Both are ROHS3 compliant with MSL 1 rating.

Q: What is the difference between MC74LCX245DWG and MC74LCX245DWR2G?

A: Both parts are electrically identical with 2V ~ 5.5V supply voltage range and -55°C ~ 125°C operating temperature. The primary difference is packaging format: MC74LCX245DWG is supplied in tube packaging, while MC74LCX245DWR2G is supplied in cut tape format. Both maintain the same 20-SOIC package footprint and MSL 3 rating.

Q: Why do some substitutes have different package widths (0.209" versus 0.295")?

A: The SN74LVC245ANS and SN74LVC245ANSR variants use a narrower 20-SOIC package (0.209" width) compared to the standard 20-SOIC (0.295" width). Both maintain identical electrical specifications and pin configuration. Package width differences may affect PCB layout considerations but do not impact electrical compatibility.

Q: Are all listed substitutes currently in production?

A: All substitutes except the original 74LCX245WM are classified as active products. The 74LCX245WM is obsolete. Active substitutes from onsemi, Texas Instruments, and Nexperia USA Inc. have established supply chains and production continuity.

Q: What is the significance of MSL rating differences?

A: The original 74LCX245WM carries MSL 1 (unlimited moisture sensitivity), indicating no moisture bake requirement before soldering. Most active substitutes maintain MSL 1 rating. The MC74LCX245DWG and MC74LCX245DWR2G carry MSL 3 (168 hours), requiring moisture bake procedures before reflow soldering if the package has been exposed to ambient humidity for extended periods.

Q: Can the 74LCX245WM be replaced with parts rated for 5.5V supply?

A: Yes, for applications where the circuit operates at or below 3.6V supply voltage. The MC74LCX245DWG and MC74LCX245DWR2G are rated for 2V ~ 5.5V supply, providing backward compatibility with the original 2V ~ 3.6V specification while offering extended upper voltage tolerance. This substitution is appropriate when future design flexibility or mixed-voltage system integration is required.

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