74VCX245WM Equivalent & Substitute Parts

Part Overview

The 74VCX245WM is a non-inverting transceiver IC manufactured by onsemi, designed for 8-bit data bus applications with 3-state output capability. Operating across a supply voltage range of 1.4V to 3.6V, this component is housed in a 20-SOIC package and rated for -40°C to 85°C operation. The 74VCX245WM is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

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	1.4V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	20-SOIC (0.295", 7.50mm Width)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74VCX245WM is determined by the following critical parameters:

Logic Type: Transceiver, Non-Inverting (1 Element, 8 Bit per Element)
Output Type: 3-State
Output Current: 24mA (High and Low)
Operating Temperature Range: -40°C to 85°C
Mounting Type: Surface Mount
Package Type: 20-SOIC or 20-SO

All substitute parts listed maintain these core electrical and mechanical specifications. Variations in supply voltage range (1.65V ~ 3.6V for active substitutes versus 1.4V ~ 3.6V for the original) represent an acceptable narrowing of the lower voltage limit, as the substitute parts remain compatible with standard 3.3V and lower voltage applications. Package width variations (0.295" versus 0.209") indicate different physical footprints and must be evaluated for PCB layout compatibility.

Parameter Comparison

Part Number	Manufacturer	Series	Status	Supply Voltage	Output Current (mA)	Package	Package Width
74VCX245WM	onsemi	74VCX	Obsolete	1.4V ~ 3.6V	24, 24	20-SOIC	0.295" (7.50mm)
74ALVC245D,118	NXP USA Inc.	74ALVC	Active	1.65V ~ 3.6V	24, 24	20-SO	0.295" (7.50mm)
SN74ALVC245DW	Texas Instruments	74ALVC	Active	1.65V ~ 3.6V	24, 24	20-SOIC	0.295" (7.50mm)
SN74ALVC245DWR	Texas Instruments	74ALVC	Active	1.65V ~ 3.6V	24, 24	20-SOIC	0.295" (7.50mm)
SN74ALVC245NS	Texas Instruments	74ALVC	Active	1.65V ~ 3.6V	24, 24	20-SO	0.209" (5.30mm)
SN74ALVC245NSR	Texas Instruments	74ALVC	Active	1.65V ~ 3.6V	24, 24	20-SO	0.209" (5.30mm)
SN74ALVCH245DW	Texas Instruments	74ALVCH	Active	1.65V ~ 3.6V	24, 24	20-SOIC	0.295" (7.50mm)
SN74ALVCH245DWR	Texas Instruments	74ALVCH	Active	1.65V ~ 3.6V	24, 24	20-SOIC	0.295" (7.50mm)

Engineering Selection Recommendations

All listed substitute parts are classified as Active products, ensuring ongoing availability and manufacturing support. The 74ALVC and 74ALVCH series from Texas Instruments and NXP USA Inc. provide direct functional equivalents with identical electrical performance characteristics.

For applications requiring the exact package footprint match (20-SOIC, 0.295" width), select from SN74ALVC245DW, SN74ALVC245DWR, SN74ALVCH245DW, or SN74ALVCH245DWR. These parts maintain pin-for-pin compatibility and identical package dimensions.

For applications where package width variation is acceptable, SN74ALVC245NS and SN74ALVC245NSR offer the same electrical specifications in a narrower 20-SO package (0.209" width).

The NXP part 74ALVC245D,118 provides an alternative from a different manufacturer while maintaining electrical equivalence, though package designation differs slightly (20-SO versus 20-SOIC).

All substitute parts carry RoHS3 compliance and REACH Unaffected status where specified, supporting environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the 74VCX245WM be directly replaced with SN74ALVC245DW?

A: Yes. Both parts share identical logic type (non-inverting transceiver), bit configuration (1 element, 8 bits), output type (3-state), output current (24mA), operating temperature range (-40°C to 85°C), and package footprint (20-SOIC, 0.295" width). The supply voltage range difference (1.4V ~ 3.6V versus 1.65V ~ 3.6V) does not affect compatibility in standard 3.3V applications.

Q: What is the difference between 20-SOIC and 20-SO packages?

A: Both designations refer to 20-pin small-outline packages. The primary distinction lies in package width: 20-SOIC typically measures 0.295" (7.50mm) width, while 20-SO can measure 0.209" (5.30mm) width. PCB layout and footprint compatibility must be verified before substitution.

Q: Are all substitute parts pin-for-pin compatible?

A: All listed substitute parts maintain identical pin configuration and functional assignment as the 74VCX245WM. Pin-for-pin compatibility is confirmed across all alternatives.

Q: Which substitute part offers the best long-term availability?

A: Texas Instruments SN74ALVC245DW, SN74ALVC245DWR, SN74ALVCH245DW, and SN74ALVCH245DWR are all classified as Active products with established supply chains. NXP's 74ALVC245D,118 is also Active. All provide superior availability compared to the obsolete 74VCX245WM.

Q: Do substitute parts require design modifications?

A: No design modifications are required. All substitute parts are direct functional equivalents with identical electrical specifications and pin assignments. PCB layout remains unchanged for parts with matching package dimensions.

Q: What is the significance of the "R" suffix in part numbers like SN74ALVC245DWR?

A: The "R" suffix indicates Tape & Reel packaging, suitable for automated assembly processes. Parts without the "R" suffix (such as SN74ALVC245DW) are supplied in Tube packaging. Electrical specifications are identical; packaging format differs only.

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