CD74HC377PWG4 Equivalent & Substitute Parts

Part Overview

The CD74HC377PWG4 is a D-type flip-flop logic integrated circuit manufactured by Texas Instruments, featuring 1 element with 8-bit parallel data storage capability. This component operates as a standard positive-edge-triggered flip-flop in the 74HC logic family, housed in a 20-TSSOP surface-mount package. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers to maintain design continuity and ensure supply chain availability.

Key Parameters

Parameter	CD74HC377PWG4
Manufacturer	Texas Instruments
Series	74HC
Type	D-Type Flip-Flop
Number of Elements	1
Number of Bits per Element	8
Output Type	Non-Inverted
Clock Frequency	60 MHz
Max Propagation Delay @ 6V, 50pF	30 ns
Trigger Type	Positive Edge
Voltage Supply Range	2V ~ 6V
Current - Output High/Low	5.2 mA / 5.2 mA
Current - Quiescent (Iq)	8 µA
Input Capacitance	10 pF
Operating Temperature Range	-55°C ~ 125°C
Package / Case	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the CD74HC377PWG4 is determined by the following critical parameters:

Primary Substitution Criteria:

Base product number (74HC377 or functionally equivalent 74HC/74AHC/74VHC series)
Package type (20-TSSOP surface mount)
Output configuration (Non-Inverted or Tri-State, Non-Inverted)
Trigger type (Positive Edge)
Number of bits per element (8-bit)
Supply voltage compatibility (2V ~ 6V minimum overlap)
Operating temperature range (minimum -40°C to support industrial applications)

Substitution Groups:

Group 1: Direct 74HC377 Equivalents (Recommended) Parts maintaining identical base product number, non-inverted output, and 74HC series characteristics. These provide the closest functional match with minimal design impact.

Group 2: Enhanced Performance Alternatives (74HC377 with Improved Specs) Parts with 74HC377 base number but improved propagation delay and input capacitance specifications, offering performance enhancement while maintaining backward compatibility.

Group 3: Higher-Performance Series (74AHC/74VHC) Parts from faster logic families (74AHC574, 74VHC574) with tri-state output capability. These offer superior speed and lower quiescent current but require verification of tri-state output compatibility in the application circuit.

Parameter Comparison

Parameter	CD74HC377PWG4	74HC377PW-Q100J	CD74HC377PW	74HC377PW,118	74AHC574PW,118	74VHC574MTCX	MC74HC374ADTR2G	MC74HC574ADTR2G
Manufacturer	Texas Instruments	Nexperia USA Inc.	Texas Instruments	Nexperia USA Inc.	Nexperia USA Inc.	onsemi	onsemi	onsemi
Series	74HC	74HC	74HC	74HC	74AHC	74VHC	74HC	74HC
Base Product Number	74HC377	74HC377	74HC377	74HC377	74AHC574	74VHC574	74HC374	74HC574
Output Type	Non-Inverted	Non-Inverted	Non-Inverted	Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted
Clock Frequency	60 MHz	83 MHz	60 MHz	83 MHz	115 MHz	115 MHz	35 MHz	35 MHz
Max Propagation Delay @ 6V, 50pF	30 ns	27 ns	30 ns	27 ns	10.6 ns @ 5V	10.6 ns @ 5V	21 ns @ 6V	27 ns @ 6V
Voltage Supply Range	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 5.5V	2V ~ 5.5V	2V ~ 6V	2V ~ 6V
Current - Output High/Low	5.2 mA / 5.2 mA	5.2 mA / 5.2 mA	5.2 mA / 5.2 mA	5.2 mA / 5.2 mA	8 mA / 8 mA	8 mA / 8 mA	7.8 mA / 7.8 mA	7.8 mA / 7.8 mA
Current - Quiescent (Iq)	8 µA	8 µA	8 µA	8 µA	4 µA	4 µA	4 µA	4 µA
Input Capacitance	10 pF	4.6 pF	10 pF	4.6 pF	3 pF	4 pF	10 pF	10 pF
Operating Temperature Range	-55°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C
Package / Case	20-TSSOP	20-TSSOP	20-TSSOP	20-TSSOP	20-TSSOP	20-TSSOP	20-TSSOP	20-TSSOP
Product Status	Discontinued	Active	Discontinued	Active	Active	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1: Primary Substitutes (Direct 74HC377 Replacements)

74HC377PW,118 (Nexperia USA Inc.) and 74HC377PW-Q100J (Nexperia USA Inc.) are the recommended primary substitutes. Both maintain the 74HC377 base product number, identical package configuration, and non-inverted output type. These parts are currently active in production with established supply availability. The 74HC377PW,118 variant offers improved propagation delay (27 ns vs. 30 ns) and reduced input capacitance (4.6 pF vs. 10 pF) while maintaining full backward compatibility. The 74HC377PW-Q100J includes AEC-Q100 automotive qualification, suitable for applications requiring automotive-grade components.

Tier 2: Performance-Enhanced Alternatives (Higher-Speed Logic Families)

74AHC574PW,118 (Nexperia USA Inc.) and 74VHC574MTCX (onsemi) provide superior performance characteristics with 115 MHz clock frequency and 10.6 ns propagation delay. These parts feature tri-state output capability, requiring circuit verification to confirm tri-state functionality is compatible with the application. Supply voltage range reduces to 2V ~ 5.5V, necessitating confirmation that 6V operation is not required. Quiescent current is reduced to 4 µA, offering power consumption benefits.

Tier 3: Alternative 74HC Series Options

MC74HC574ADTR2G (onsemi) and MC74HC374ADTR2G (onsemi) are active alternatives with tri-state output configuration. These parts operate at lower clock frequency (35 MHz) compared to the original specification but maintain the 20-TSSOP package and extended temperature range (-55°C ~ 125°C). MC74HC574ADTR2G is currently active; MC74HC374ADTR2G is obsolete and should be avoided for new designs.

Selection Criteria Summary:

For direct replacement without circuit modification: Select 74HC377PW,118 or 74HC377PW-Q100J
For automotive applications: Select 74HC377PW-Q100J (AEC-Q100 qualified)
For performance-critical applications with tri-state output compatibility: Select 74AHC574PW,118 or 74VHC574MTCX
Verify tri-state output compatibility before selecting Tier 2 or Tier 3 alternatives
Confirm 5.5V maximum supply voltage is acceptable if selecting 74AHC or 74VHC series
Verify operating temperature range requirements; 74VHC574MTCX maximum is 85°C

Frequently Asked Questions (FAQ)

Q: Can I directly replace CD74HC377PWG4 with 74HC377PW,118 without circuit modifications?

A: Yes. Both parts share identical base product number (74HC377), package type (20-TSSOP), output configuration (non-inverted), and supply voltage range (2V ~ 6V). The 74HC377PW,118 offers improved propagation delay and reduced input capacitance, making it a direct functional upgrade.

Q: What is the difference between 74HC377 and 74HC574 variants?

A: The 74HC377 features non-inverted output only, while 74HC574 variants include tri-state output capability. If your circuit requires tri-state output (high-impedance state), 74HC574 is suitable. If your circuit requires only standard non-inverted output, 74HC377 is the correct choice.

Q: Why do 74AHC574 and 74VHC574 parts have different maximum operating temperatures?

A: 74AHC574PW,118 supports -40°C ~ 125°C operating range, while 74VHC574MTCX supports -40°C ~ 85°C. The 74VHC574MTCX has a reduced upper temperature limit. Verify your application's maximum operating temperature requirement before selection.

Q: Can I use 74AHC574PW,118 if my circuit operates at 6V?

A: No. The 74AHC574PW,118 maximum supply voltage is 5.5V. The original CD74HC377PWG4 supports 2V ~ 6V. If 6V operation is required, select 74HC377PW,118 or 74HC377PW-Q100J instead.

Q: What does "tri-state output" mean, and do I need it?

A: Tri-state output allows the output to assume three states: high, low, or high-impedance (disconnected). This is useful in bus-sharing applications where multiple devices drive a common line. If your circuit does not require this capability, non-inverted output parts (74HC377 series) are appropriate.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, matching the compliance status of the original CD74HC377PWG4.

Q: What is the significance of the AEC-Q100 qualification on 74HC377PW-Q100J?

A: AEC-Q100 is an automotive industry qualification standard. Parts bearing this qualification have undergone additional reliability testing and are approved for automotive applications. Select this variant if your application is automotive or requires automotive-grade component reliability.

Q: Why is MC74HC374ADTR2G listed as obsolete?

A: MC74HC374ADTR2G is marked obsolete by the manufacturer and should not be selected for new designs. Use MC74HC574ADTR2G (active status) or Tier 1 alternatives instead.

Q: Can I use parts with lower clock frequency specifications?

A: Yes, if your application does not require the full 60 MHz clock frequency. Parts with lower clock frequency (such as MC74HC574ADTR2G at 35 MHz) are backward compatible for lower-speed applications. Verify your circuit's actual clock frequency requirement before selection.

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