CD74HCT165M-P Equivalent & Substitute Parts

Part Overview

The CD74HCT165M-P is an 8-bit parallel-in/serial-out shift register manufactured by Texas Instruments, designed for logic-level signal conversion and data serialization applications. This component operates within the 74HCT logic family and features complementary push-pull outputs suitable for standard TTL/CMOS interface requirements.

The CD74HCT165M-P is classified as obsolete, which necessitates identification of functionally equivalent substitute components for ongoing design support and procurement. Active alternatives within the same logic family provide equivalent electrical performance while offering improved availability and extended product lifecycle support.

Substiute Parts

CD74HCT165M-P

Texas InstrumentsIn Stock: 1145CD74HCT165M-P Datasheet

Current PartRFQ

SN74HCT165PWR

Texas InstrumentsIn Stock: 10756SN74HCT165PWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD74HCT165M-P is determined by strict equivalence across the following critical parameters:

Electrical Compatibility Parameters:

• Logic family classification (74HCT series)
• Shift register function with 8-bit parallel-in/serial-out capability
• Supply voltage range (4.5V ~ 5.5V)
• Output type (complementary push-pull configuration)
• Number of elements and bits per element (1 element, 8 bits)

Physical & Environmental Parameters:

• Surface mount technology
• Moisture sensitivity level (MSL 1 - unlimited shelf life)
• RoHS compliance status

Acceptable Variation:

• Operating temperature range may extend beyond the original specification (substitute may support wider range)
• Package form factor may differ (SOIC to TSSOP conversion acceptable with appropriate PCB layout accommodation)
• Product status transition from obsolete to active is acceptable

The SN74HCT165PWR substitute meets all electrical equivalence criteria while providing active product status and improved market availability.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SN74HCT165PWR

The SN74HCT165PWR is the manufacturer-recommended substitute for the CD74HCT165M-P. This component provides full electrical equivalence across all critical shift register parameters including logic family, bit width, function, supply voltage, and output configuration.

Justification for Substitution:

1. Product Lifecycle: The CD74HCT165M-P is classified as obsolete. The SN74HCT165PWR maintains active product status, ensuring long-term availability and continued manufacturer support.

2. Electrical Equivalence: Both components operate within identical supply voltage ranges (4.5V ~ 5.5V) and provide equivalent shift register functionality with 8-bit parallel-in/serial-out capability and complementary push-pull outputs.

3. Environmental Compliance: Both components feature MSL 1 (unlimited moisture sensitivity level), indicating equivalent handling and storage requirements. The main part carries ROHS3 compliance certification.

4. Operating Temperature Consideration: The substitute operates across -40°C ~ 125°C, which is narrower than the main part's -55°C ~ 125°C range at the lower temperature limit. Applications requiring operation below -40°C require verification against specific design requirements.

5. Package Form Factor Change: The substitute transitions from 16-SOIC to 16-TSSOP packaging. Both are surface-mount technologies with identical pin counts. PCB layout modification is required to accommodate the different package dimensions (SOIC: 0.154" width vs. TSSOP: 0.173" width).

Implementation Considerations:

• PCB footprint redesign is necessary due to package form factor change
• Pin-to-pin electrical compatibility is maintained
• No circuit topology modifications are required
• Thermal management characteristics may differ slightly between package types

Frequently Asked Questions (FAQ)

Q: Can the SN74HCT165PWR be used as a direct pin-for-pin replacement for the CD74HCT165M-P?

A: Both components share identical pin counts (16 pins) and equivalent electrical function. However, the package form factor differs (SOIC vs. TSSOP), requiring PCB footprint modification. Direct socket substitution is not possible without adapter hardware.

Q: What is the primary reason for substituting the CD74HCT165M-P?

A: The CD74HCT165M-P is classified as obsolete. The SN74HCT165PWR provides equivalent functionality with active product status, ensuring continued availability and manufacturer support for new designs and production runs.

Q: Are the supply voltage requirements identical between these components?

A: Yes. Both the CD74HCT165M-P and SN74HCT165PWR operate within the identical supply voltage range of 4.5V ~ 5.5V, ensuring direct electrical compatibility in power supply circuits.

Q: What is the difference in operating temperature ranges?

A: The CD74HCT165M-P operates from -55°C ~ 125°C, while the SN74HCT165PWR operates from -40°C ~ 125°C. The substitute has a narrower lower temperature limit. Applications requiring operation below -40°C must evaluate this specification against design requirements.

Q: Do both components have the same moisture sensitivity level?

A: Yes. Both components are classified as MSL 1 (Unlimited), indicating identical handling, storage, and shelf-life characteristics. No additional moisture control measures are required for either component.

Q: What packaging changes are involved in this substitution?

A: The main part uses 16-SOIC packaging (0.154" width), while the substitute uses 16-TSSOP packaging (0.173" width). Both are surface-mount technologies. PCB layout modification is required to accommodate the different package footprint.

Q: Is the shift register function identical between these components?

A: Both components provide 8-bit shift register functionality with parallel-in/serial-out capability. The main part specifies "Parallel or Serial to Serial" function, while the substitute specifies "Parallel to Serial." Both support the required data serialization operations.

Q: Are there any compliance or certification differences?

A: The CD74HCT165M-P carries ROHS3 compliance certification. The SN74HCT165PWR RoHS status is listed as "Not applicable." Designs requiring specific RoHS compliance should verify the substitute against applicable regulatory requirements.