74HCT540DB,112 Equivalent & Substitute Parts

Part Overview

The 74HCT540DB,112 is an inverting buffer logic integrated circuit manufactured by Nexperia USA Inc. in a 20-SSOP surface mount package. This device functions as a Buffer, Inverting with 1 element, 8 bits per element, and 3-state output capability. The part is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

74HCT540DB,112

Nexperia USA Inc.In Stock: 103474HCT540DB,112 Datasheet

Current PartRFQ

74HCT540PWJ

Nexperia USA Inc.In Stock: 92374HCT540PWJ Datasheet

MFR RecommendedRFQ

MM74HCT540MTC

onsemiIn Stock: 1075MM74HCT540MTC Datasheet

SimilarRFQ

MM74HCT540MTCX

onsemiIn Stock: 7350MM74HCT540MTCX Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74HCT540DB,112 is determined by the following critical parameters:

• Logic Type: Buffer, Inverting
• Number of Elements: 1
• Number of Bits per Element: 8
• Output Type: 3-State
• Voltage - Supply: 4.5V ~ 5.5V
• Mounting Type: Surface Mount
• Base Product Number: 74HCT540

Substitute parts must maintain identical functional specifications (logic type, element count, bit width, and output configuration) and operate within the same supply voltage range. Package variations are acceptable when mechanical and thermal characteristics remain compatible with the application's PCB layout and assembly process. Output current ratings may vary within acceptable engineering tolerances for the 74HCT logic family.

Parameter Comparison

Engineering Selection Recommendations

74HCT540PWJ (Nexperia USA Inc.) is the manufacturer-recommended substitute. This part maintains identical electrical specifications to the main part, including output current ratings and operating temperature range. The primary difference is the package transition from 20-SSOP to 20-TSSOP, which represents a narrower package footprint (4.40mm vs. 5.30mm width). This part carries Active product status, ensuring long-term availability and supply chain continuity. ROHS3 compliance and MSL 1 rating are maintained.

MM74HCT540MTCX (onsemi) is an alternative substitute with Active product status. This part provides the same functional logic and electrical performance as the main part. Output current is rated at 7.2mA (compared to 6mA for the main part), which is within acceptable tolerance for the 74HCT logic family. Operating temperature range is limited to -40°C ~ 85°C, which may be a constraint for applications requiring the full -40°C ~ 125°C range. The 20-TSSOP package is identical to the 74HCT540PWJ. Packaging is supplied as Tape & Reel (TR), supporting automated assembly processes.

MM74HCT540MTC (onsemi) is a similar substitute with Obsolete product status. While functionally equivalent, the obsolete classification limits its suitability for new designs or long-term procurement strategies. This part shares the same electrical and package characteristics as MM74HCT540MTCX but is not supplied in Tape & Reel format.

For applications requiring the full -40°C ~ 125°C operating temperature range, 74HCT540PWJ is the appropriate selection. For applications with -40°C ~ 85°C temperature requirements, MM74HCT540MTCX provides an alternative with higher output current capability and Active product status.

Frequently Asked Questions (FAQ)

Q: Can the 74HCT540PWJ be used as a direct replacement for the 74HCT540DB,112?

A: Yes. Both parts maintain identical logic type, element count, bit width, output configuration, supply voltage range, and operating temperature specifications. The primary difference is the package footprint: 20-TSSOP (4.40mm width) versus 20-SSOP (5.30mm width). PCB layout modifications are required to accommodate the narrower package.

Q: What is the significance of the package change from 20-SSOP to 20-TSSOP?

A: The 20-TSSOP package is narrower (4.40mm vs. 5.30mm) and represents a more compact form factor. Both are surface mount packages with identical pin counts and electrical characteristics. The transition requires PCB footprint redesign but does not affect electrical functionality or performance.

Q: Are the onsemi MM74HCT540 parts fully compatible with the Nexperia 74HCT540DB,112?

A: Functional compatibility is maintained across all specified parameters. The onsemi parts feature identical logic type, element configuration, and supply voltage range. Output current ratings are slightly higher (7.2mA vs. 6mA), which is acceptable within 74HCT logic family tolerances. Operating temperature range for onsemi parts is -40°C ~ 85°C, which is narrower than the main part's -40°C ~ 125°C range. Application temperature requirements must be verified before selection.

Q: Why is product status (Active vs. Obsolete) important for part selection?

A: Active product status indicates ongoing manufacturer support, continued production, and long-term supply chain availability. Obsolete parts may have limited stock and no guarantee of future availability. For new designs or long-term production, Active status parts are preferred.

Q: What does RoHS3 compliance mean for this part?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting the use of specific hazardous materials in electrical and electronic equipment. All substitute parts listed maintain ROHS3 compliance, ensuring regulatory alignment across the supply chain.

Q: Is the higher output current rating (7.2mA) of the onsemi parts a concern?

A: No. The higher output current rating is within acceptable tolerance for the 74HCT logic family and does not create compatibility issues. In fact, it may provide improved drive capability for certain load conditions. Applications should verify that the receiving circuit can accommodate the specified output current without degradation.