CD74HC373E-NG Equivalent & Substitute Parts

Part Overview

The CD74HC373E-NG is a D-Type Transparent Latch logic integrated circuit manufactured by Texas Instruments, configured as a single channel 8:8 multiplexer with tri-state, non-inverted output. This component operates across a 2V to 6V supply voltage range and is housed in a 20-pin DIP package suitable for through-hole mounting applications.

The CD74HC373E-NG carries an obsolete product status. Locating equivalent substitute parts is necessary to support legacy system maintenance, design updates, and procurement continuity where original components are no longer manufactured or available in production quantities.

Substiute Parts

CD74HC373E-NG

Texas InstrumentsIn Stock: 971CD74HC373E-NG Datasheet

Current PartRFQ

SN74HCS373RKSR

Texas InstrumentsIn Stock: 2164SN74HCS373RKSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CD74HC373E-NG is determined by the following critical parameters:

Functional Equivalence Requirements:

• Logic Type: D-Type Transparent Latch
• Circuit Configuration: 8:8
• Output Type: Tri-State capability
• Voltage Supply Range: 2V ~ 6V (minimum overlap required)
• Independent Circuits: 1 channel

Electrical Compatibility Requirements:

• Output Current Capability: 7.8mA minimum (High and Low)
• Operating Temperature Range: Must support at least -40°C ~ 125°C

Mechanical Compatibility Considerations:

• Package options include both through-hole (20-DIP) and surface-mount (20-VQFN) variants
• Pin count and functional pin assignment must remain consistent

The SN74HCS373RKSR qualifies as a direct functional substitute based on matching logic type, circuit configuration, output type, voltage supply range, output current specifications, and independent circuit count. Package form factor differs (surface-mount VQFN versus through-hole DIP), requiring adapter solutions or PCB redesign for direct board-level replacement.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The CD74HC373E-NG is classified as obsolete. The SN74HCS373RKSR carries active product status, ensuring ongoing manufacturer support, availability, and compliance updates. Selection of the active substitute part supports long-term supply chain stability and regulatory compliance maintenance.

Compliance and Certification: The CD74HC373E-NG meets ROHS3 compliance requirements. The SN74HCS373RKSR does not carry explicit RoHS designation in the provided data but maintains active status under current manufacturing standards. Both components are manufactured by Texas Instruments, ensuring consistent quality and reliability standards.

Electrical Performance: The SN74HCS373RKSR demonstrates superior propagation delay performance (11ns versus 30ns), providing faster signal switching characteristics. Output current specifications remain identical at 7.8mA for both high and low states, ensuring equivalent drive capability for connected logic circuits.

Temperature Range: The CD74HC373E-NG supports -55°C to 125°C operation. The SN74HCS373RKSR operates across -40°C to 125°C. Applications requiring sub-zero temperatures below -40°C must retain the original part or identify alternative solutions.

Package and Mounting: Direct board-level substitution requires package conversion. Through-hole DIP mounting (CD74HC373E-NG) differs from surface-mount VQFN (SN74HCS373RKSR). PCB redesign or adapter modules are necessary for physical integration.

Frequently Asked Questions (FAQ)

Q: Can the SN74HCS373RKSR replace the CD74HC373E-NG in existing circuit boards without modification?

A: Functional substitution is possible; physical substitution requires modification. The SN74HCS373RKSR uses surface-mount VQFN packaging while the CD74HC373E-NG uses through-hole DIP packaging. Direct socket replacement is not feasible without PCB redesign or adapter solutions.

Q: What are the key electrical differences between these parts?

A: Both parts maintain identical voltage supply range (2V ~ 6V), output current specifications (7.8mA), and logic configuration (8:8 D-Type Transparent Latch). The SN74HCS373RKSR provides faster propagation delay (11ns versus 30ns). The CD74HC373E-NG supports extended low-temperature operation (-55°C minimum versus -40°C).

Q: Is the SN74HCS373RKSR suitable for applications requiring -55°C operation?

A: No. The SN74HCS373RKSR minimum operating temperature is -40°C. Applications requiring -55°C operation must use the CD74HC373E-NG or identify alternative components with equivalent extended temperature specifications.

Q: What is the significance of the obsolete status for the CD74HC373E-NG?

A: Obsolete status indicates the manufacturer has discontinued production. Existing inventory may be available through authorized distributors, but long-term availability is not guaranteed. The active SN74HCS373RKSR provides assured supply continuity for new designs and ongoing production requirements.

Q: Are there pin-to-pin compatibility considerations between these parts?

A: Both parts maintain identical 20-pin configurations with matching functional pin assignments for the 8:8 D-Type Transparent Latch circuit. Pin compatibility is confirmed; package form factor differences (DIP versus VQFN) require mechanical adaptation.

Q: What moisture sensitivity level applies to the SN74HCS373RKSR?

A: The SN74HCS373RKSR carries MSL Level 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard handling and storage procedures apply without specialized dry-pack requirements.