74HCT540D,652 Equivalent & Substitute Parts

Part Overview

The 74HCT540D,652 is an octal buffer and line driver logic IC manufactured by Nexperia USA Inc. in a 20-SOIC surface mount package. This part functions as a buffer with inverting logic, featuring 1 element with 8 bits per element and 3-state output capability. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	74HCT540D,652
Manufacturer	Nexperia USA Inc.
Logic Type	Buffer, Inverting
Number of Elements	1
Number of Bits per Element	8
Output Type	3-State
Current - Output High, Low	6mA, 6mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the 74HCT540D,652 are classified based on the following substitution criteria:

Parametric Equivalents: Parts that match all critical electrical and mechanical parameters, including logic type, element count, bit configuration, output type, supply voltage range, and package specification.

Upgrade Parts: Parts that maintain functional equivalence but may have extended operating temperature ranges or different compliance certifications.

Similar Parts: Parts that share the same base product number (74HCT540) and functional characteristics but may have minor variations in output current specifications or operating temperature limits.

The key parameters determining substitutability are:

Logic Type: Buffer, Inverting
Number of Elements: 1
Number of Bits per Element: 8
Output Type: 3-State
Supply Voltage: 4.5V ~ 5.5V
Package: 20-SOIC
Mounting Type: Surface Mount

Parameter Comparison

Part Number	Manufacturer	Logic Type	Output Current (High/Low)	Operating Temp	Product Status	RoHS Status
74HCT540D,652	Nexperia USA Inc.	Buffer, Inverting	6mA / 6mA	-40°C ~ 125°C	Obsolete	ROHS3 Compliant
74HCT7540D,112	Nexperia USA Inc.	Buffer, Inverting	6mA / 6mA	-40°C ~ 125°C	Obsolete	ROHS3 Compliant
CD74HCT540M96	Harris Corporation	Buffer, Inverting	6mA / 6mA	-55°C ~ 125°C	Obsolete	RoHS Non-Compliant
MM74HCT540WM	Elantec	Buffer, Inverting	7.2mA / 7.2mA	-40°C ~ 85°C	Active	Not Specified
MM74HCT540WMX	onsemi	Buffer, Inverting	7.2mA / 7.2mA	-40°C ~ 85°C	Obsolete	ROHS3 Compliant
SN74HCT540DW	Texas Instruments	Buffer, Inverting	6mA / 6mA	-40°C ~ 85°C	Discontinued at DiGi Electronics	ROHS3 Compliant
SN74HCT540DWR	Texas Instruments	Buffer, Inverting	6mA / 6mA	-40°C ~ 85°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Parametric Equivalent (74HCT7540D,112): This Nexperia part provides direct functional equivalence with identical electrical specifications and operating temperature range. Both parts are obsolete with ROHS3 compliance, making this the closest match for direct substitution.

Upgrade Option (CD74HCT540M96): The Harris Corporation part extends the operating temperature range to -55°C ~ 125°C, providing enhanced performance for extreme temperature applications. However, this part is RoHS non-compliant, which may restrict use in regulated environments.

Active Alternatives (SN74HCT540DWR, MM74HCT540WM): Texas Instruments SN74HCT540DWR is currently active and ROHS3 compliant, offering long-term availability. The Elantec MM74HCT540WM is also active but has slightly higher output current (7.2mA vs 6mA) and a reduced operating temperature range (-40°C ~ 85°C).

Compliance Considerations: For applications requiring RoHS3 compliance, select from 74HCT7540D,112, MM74HCT540WMX, SN74HCT540DW, or SN74HCT540DWR. The CD74HCT540M96 is not suitable for RoHS-regulated applications.

Frequently Asked Questions (FAQ)

Q: Can I use SN74HCT540DWR as a direct replacement for 74HCT540D,652?

A: Yes. Both parts share identical logic type, element configuration, output type, supply voltage, and package specifications. The SN74HCT540DWR has a reduced operating temperature range (-40°C ~ 85°C vs -40°C ~ 125°C), which is acceptable for most commercial applications. The SN74HCT540DWR is currently active with ROHS3 compliance.

Q: What is the difference between MM74HCT540WM and MM74HCT540WMX?

A: Both parts are functionally equivalent with identical output current (7.2mA) and operating temperature range (-40°C ~ 85°C). The primary difference is manufacturer: MM74HCT540WM is from Elantec (active status), while MM74HCT540WMX is from onsemi (obsolete status). Both are in 20-SOIC packages.

Q: Is the CD74HCT540M96 suitable for my application?

A: The CD74HCT540M96 is functionally compatible but has two important limitations: it is RoHS non-compliant and obsolete. Use this part only if your application specifically requires the extended operating temperature range (-55°C ~ 125°C) and RoHS compliance is not a requirement.

Q: Why do some substitute parts have higher output current specifications?

A: Parts like MM74HCT540WM and MM74HCT540WMX specify 7.2mA output current compared to 6mA in the original part. This represents a manufacturing variation across different vendors. Both specifications are within acceptable tolerances for 74HCT logic family applications and do not affect functional compatibility.

Q: What packaging options are available?

A: All listed substitute parts use the 20-SOIC (0.295", 7.50mm Width) surface mount package, matching the original 74HCT540D,652. Packaging variations exist only in tape format (Tube, Bulk, Cut Tape & Digi-Reel, or Tape & Reel), which do not affect electrical or mechanical compatibility.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message