CD74HC75NSR Equivalent & Substitute Parts

Part Overview

The CD74HC75NSR is a D-Type Transparent Latch IC manufactured by Texas Instruments, featuring dual 2-bit transparent latch functionality in a 16-SOIC package. This component is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and procurement continuity. The part operates across a 2V to 6V supply voltage range with 10ns propagation delay and differential output configuration, serving applications requiring transparent latch logic in compact surface-mount form factors.

Substiute Parts

CD74HC75NSR

Texas InstrumentsIn Stock: 870CD74HC75NSR Datasheet

Current PartRFQ

74HC7540D,112

Nexperia USA Inc.In Stock: 99174HC7540D,112 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute part identification for the CD74HC75NSR is based on the following critical parameters that define functional equivalence:

• Logic Family & Series: 74HC series compatibility ensures voltage and timing characteristics alignment
• Supply Voltage Range: 2V ~ 6V operational envelope
• Output Configuration: Differential output capability
• Propagation Delay: Maximum 10ns specification
• Output Current Capability: Minimum 5.2mA per output
• Operating Temperature Range: Support for -55°C to 125°C or equivalent industrial range
• RoHS3 Compliance: Environmental and regulatory alignment
• Surface Mount Packaging: 16-pin or compatible pin-count SOIC variants

The identified substitute part 74HC7540D,112 (Nexperia USA Inc.) shares the 74HC logic family designation, 2V ~ 6V supply voltage range, surface-mount configuration, and equivalent compliance certifications. However, functional differences exist in logic type (Buffer, Inverting vs. D-Type Transparent Latch) and package pin count (20-SO vs. 16-SO), requiring circuit-level evaluation for direct substitution feasibility.

Parameter Comparison

Engineering Selection Recommendations

Both the CD74HC75NSR and 74HC7540D,112 maintain ROHS3 compliance and MSL Level 1 ratings, supporting equivalent environmental and regulatory requirements. Both components are classified as obsolete, indicating limited availability through standard distribution channels.

The 74HC7540D,112 demonstrates higher output current capability (7.8mA vs. 5.2mA), providing improved drive strength for downstream logic stages. However, the substitute operates across a narrower temperature range (-40°C to 125°C vs. -55°C to 125°C), which may restrict applicability in extended industrial temperature environments.

Package footprint differences (16-SOIC vs. 20-SOIC) and functional logic type differences (D-Type Transparent Latch vs. Buffer, Inverting) require circuit schematic review to determine direct substitution viability. Pin-to-pin compatibility cannot be assumed based on series designation alone.

Frequently Asked Questions (FAQ)

Q: Can the 74HC7540D,112 directly replace the CD74HC75NSR in existing designs?

A: Direct replacement requires verification of pin assignments, logic function requirements, and PCB layout accommodation for the larger 20-SOIC package. The functional difference between transparent latch and inverting buffer logic necessitates circuit-level compatibility assessment.

Q: What are the key differences between these parts?

A: The CD74HC75NSR implements D-Type Transparent Latch logic in a 16-pin package, while the 74HC7540D,112 provides Buffer, Inverting functionality in a 20-pin package. Both operate within the 2V ~ 6V supply range and maintain 74HC series compatibility. Output current capability differs (5.2mA vs. 7.8mA), and operating temperature ranges vary (-55°C to 125°C vs. -40°C to 125°C).

Q: Are both parts RoHS compliant?

A: Yes, both the CD74HC75NSR and 74HC7540D,112 are ROHS3 compliant with MSL Level 1 ratings, supporting equivalent environmental and regulatory standards.

Q: What packaging considerations apply to substitution?

A: The CD74HC75NSR uses a 16-SOIC package (5.30mm width), while the 74HC7540D,112 uses a 20-SOIC package (7.50mm width). PCB layout modifications may be required to accommodate the larger footprint and increased pin count.

Q: How do the propagation delay specifications compare?

A: The CD74HC75NSR specifies 10ns propagation delay. The 74HC7540D,112 propagation delay specification is not provided in the available parameters, requiring manufacturer datasheet consultation for timing-critical applications.