CD74HCT377ME4 Equivalent & Substitute Parts

Part Overview

The CD74HCT377ME4 is a D-type flip-flop logic integrated circuit manufactured by Texas Instruments, designed for 8-bit parallel data storage and transfer applications. This component features positive edge triggering, operates at clock frequencies up to 50 MHz, and is housed in a 20-SOIC surface mount package. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility for ongoing system support and new designs.

Substiute Parts

CD74HCT377ME4

Texas InstrumentsIn Stock: 1065CD74HCT377ME4 Datasheet

Current PartRFQ

CD74HCT377M

Harris CorporationIn Stock: 12832CD74HCT377M Datasheet

MFR RecommendedRFQ

74HCT377D,652

Nexperia USA Inc.In Stock: 93374HCT377D,652 Datasheet

MFR RecommendedRFQ

74HCT377D,653

NXP USA Inc.In Stock: 791774HCT377D,653 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CD74HCT377ME4 are qualified based on the following critical parameters that determine functional and mechanical interchangeability:

Core Electrical Parameters:

• D-Type flip-flop architecture with 8-bit configuration
• Positive edge trigger mechanism
• Supply voltage range: 4.5V – 5.5V
• Output type: Non-inverted
• Quiescent current: 8 µA

Mechanical Parameters:

• Package: 20-SOIC (0.295", 7.50mm Width)
• Surface mount mounting type

Performance Parameters:

• Clock frequency capability (minimum 50 MHz)
• Propagation delay characteristics
• Output drive current (4mA minimum)

The three qualified substitutes (CD74HCT377M, 74HCT377D,652, and 74HCT377D,653) maintain these core parameters while differing in manufacturer, product status, and minor performance specifications. All three share the same base product number (74HCT377) and package footprint, ensuring direct pin-compatible replacement.

Parameter Comparison

Engineering Selection Recommendations

74HCT377D,653 (NXP USA Inc.) – Primary Recommendation

This part is the preferred substitute due to active product status, ensuring long-term availability and manufacturer support. It maintains full electrical compatibility with the CD74HCT377ME4, with improved propagation delay (32 ns vs. 38 ns) and higher clock frequency capability (53 MHz vs. 50 MHz). The part is available in bulk packaging with substantial inventory (7,840 units). Operating temperature range is -40°C to 125°C, which covers most industrial applications; designs requiring the full -55°C lower limit should be evaluated separately.

74HCT377D,652 (Nexperia USA Inc.) – Secondary Recommendation

This substitute offers identical electrical performance to 74HCT377D,653 with ROHS3 compliance certification. Product status is obsolete, which may limit future availability. Inventory is lower (908 units) compared to the primary recommendation. This part is suitable for immediate replacement needs where RoHS compliance is mandatory.

CD74HCT377M (Harris Corporation) – Tertiary Option

This part provides exact parameter matching to the CD74HCT377ME4, including 50 MHz clock frequency and 38 ns propagation delay. However, it is marked as obsolete and carries RoHS non-compliant status. Inventory availability is high (12,807 units), making it viable for legacy system maintenance where RoHS compliance is not required. This option is not recommended for new designs.

Frequently Asked Questions (FAQ)

Q: Can I directly replace CD74HCT377ME4 with 74HCT377D,653?

A: Yes. Both parts are pin-compatible D-type flip-flops in 20-SOIC packages with identical electrical specifications for supply voltage, quiescent current, output drive capability, and trigger mechanism. The 74HCT377D,653 offers superior performance with faster propagation delay and higher clock frequency.

Q: What is the difference between the three substitute parts?

A: All three substitutes are functionally equivalent 74HCT series D-type flip-flops. The primary differences are manufacturer, product lifecycle status, and minor performance variations. The 74HCT377D,652 and 74HCT377D,653 feature 53 MHz clock frequency and 32 ns propagation delay compared to 50 MHz and 38 ns for the CD74HCT377M. The 74HCT377D,653 is the only active product, while the others are obsolete.

Q: Does operating temperature range affect substitution?

A: The CD74HCT377ME4 operates from -55°C to 125°C, while 74HCT377D,652 and 74HCT377D,653 operate from -40°C to 125°C. For applications requiring operation below -40°C, the CD74HCT377M maintains the full -55°C lower limit. Most commercial and industrial applications operate within the -40°C to 125°C range.

Q: Are all substitutes RoHS compliant?

A: The 74HCT377D,652 and CD74HCT377ME4 are ROHS3 compliant. The CD74HCT377M is RoHS non-compliant. The 74HCT377D,653 compliance status is not specified in available documentation. For applications requiring RoHS certification, use 74HCT377D,652 or verify 74HCT377D,653 compliance with the manufacturer.

Q: What is the significance of input capacitance differences?

A: The CD74HCT377ME4 and CD74HCT377M have 10 pF input capacitance, while 74HCT377D,652 and 74HCT377D,653 have 4.6 pF. Lower input capacitance reduces loading on driving circuits and may improve signal integrity in high-speed applications. This difference does not prevent substitution but should be considered in timing-critical designs.

Q: Which substitute should I choose for new designs?

A: Use 74HCT377D,653 from NXP USA Inc. This part has active product status, ensuring manufacturer support and long-term availability. It provides superior performance characteristics and is available in adequate quantities for production volumes.