CD74HC377PW Equivalent & Substitute Parts

Part Overview

The CD74HC377PW 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 positive edge-triggered latch 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. Substitute parts must maintain compatibility across electrical characteristics, package dimensions, and operational parameters to ensure direct replacement capability in existing designs.

Key Parameters

Parameter	CD74HC377PW
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
Quiescent Current (Iq)	8 µA
Input Capacitance	10 pF
Operating Temperature	–55°C to 125°C
Package / Case	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the CD74HC377PW is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Package type: 20-TSSOP (0.173", 4.40mm Width) surface mount only
Logic family compatibility: 74HC, 74AHC, or 74VHC series
Function: D-Type flip-flop with 1 element, 8-bit configuration
Trigger mechanism: Positive edge-triggered operation
Output configuration: Non-inverted or tri-state non-inverted outputs
Supply voltage range: Minimum 2V to 6V overlap required
Operating temperature: Minimum –40°C to 125°C (automotive grade preferred for extended range)

Secondary Compatibility Parameters:

Clock frequency: 60 MHz minimum (higher frequencies acceptable)
Propagation delay: 30 ns maximum at 6V, 50pF load (lower delays acceptable)
Output current: 5.2 mA minimum (higher drive capability acceptable)
Quiescent current: 8 µA maximum (lower power consumption acceptable)
Input capacitance: 10 pF maximum (lower values acceptable)

Substitutes are grouped by logic family performance tier: standard 74HC series (direct equivalents), enhanced 74AHC series (improved speed and lower power), and 74VHC series (tri-state output variants). All substitute parts maintain identical package geometry and pinout compatibility.

Parameter Comparison

Part Number	Manufacturer	Series	Output Type	Clock Freq (MHz)	Prop Delay @ 6V (ns)	Supply Voltage	Iq (µA)	Temp Range (°C)	Status
CD74HC377PW	Texas Instruments	74HC	Non-Inverted	60	30	2V – 6V	8	–55 to 125	Discontinued
CD74HC377PWR	Texas Instruments	74HC	Non-Inverted	60	30	2V – 6V	8	–55 to 125	Active
74HC377PW-Q100J	Nexperia USA Inc.	74HC	Non-Inverted	83	27	2V – 6V	8	–40 to 125	Active
74HC377PW,118	Nexperia USA Inc.	74HC	Non-Inverted	83	27	2V – 6V	8	–40 to 125	Active
74AHC374PW,118	Nexperia USA Inc.	74AHC	Tri-State, Non-Inverted	120	10.1	2V – 5.5V	4	–40 to 125	Active
74AHC574PW,118	Nexperia USA Inc.	74AHC	Tri-State, Non-Inverted	115	10.6	2V – 5.5V	4	–40 to 125	Active
74VHC574MTCX	onsemi	74VHC	Tri-State, Non-Inverted	115	10.6	2V – 5.5V	4	–40 to 85	Active
74VHC574MTC	Fairchild Semiconductor	74VHC	Tri-State, Non-Inverted	115	10.6	2V – 5.5V	4	–40 to 85	Active
MC74HC374ADTR2G	onsemi	74HC	Tri-State, Non-Inverted	35	21	2V – 6V	4	–55 to 125	Active
MC74HC377ADTR2G	onsemi	74HC	Non-Inverted	35	27	2V – 6V	4	–55 to 125	Obsolete

Engineering Selection Recommendations

Tier 1 – Direct Replacement (Highest Compatibility): CD74HC377PWR (Texas Instruments) and 74HC377PW,118 (Nexperia USA Inc.) are direct functional equivalents with identical electrical specifications to the CD74HC377PW. Both maintain the 74HC series performance envelope, 2V–6V supply range, and extended temperature operation to –55°C. CD74HC377PWR is available in active production with higher inventory levels (15,677 units), making it the preferred direct substitute. The Nexperia variant (74HC377PW,118) offers improved propagation delay (27 ns vs. 30 ns) and automotive-grade qualification (AEC-Q100), suitable for applications requiring enhanced reliability.

Tier 2 – Enhanced Performance Substitutes: 74HC377PW-Q100J (Nexperia USA Inc.) provides automotive-grade qualification with improved clock frequency (83 MHz) and reduced propagation delay (27 ns). This variant is suitable for designs requiring extended temperature operation (–40°C to 125°C) and automotive compliance. The 74AHC series parts (74AHC374PW,118 and 74AHC574PW,118) offer superior speed performance (120 MHz, 115 MHz respectively) and lower quiescent current (4 µA), but operate at reduced maximum supply voltage (5.5V vs. 6V) and narrower temperature range (–40°C to 125°C). These are appropriate for power-sensitive applications where the 5.5V supply limit is acceptable.

Tier 3 – Tri-State Output Variants: 74VHC574MTCX (onsemi) and 74VHC574MTC (Fairchild Semiconductor) provide tri-state output capability with equivalent speed performance (115 MHz) and lower quiescent current (4 µA). These parts are suitable only for designs requiring tri-state bus control functionality. Operating temperature is limited to –40°C to 85°C, restricting use in extended temperature applications.

Tier 4 – Legacy Compatibility: MC74HC374ADTR2G (onsemi) and MC74HC377ADTR2G (onsemi) maintain extended temperature operation (–55°C to 125°C) but exhibit reduced clock frequency (35 MHz) and higher propagation delay (21–27 ns). These parts are suitable only for legacy designs where performance margins are not critical or where extended temperature operation is mandatory.

Compliance Considerations: All recommended substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage practices. Automotive-grade variants (74HC377PW-Q100J, 74HC377PW,118) carry AEC-Q100 qualification for applications requiring automotive reliability standards.

Frequently Asked Questions (FAQ)

Q: Can I use 74AHC374PW,118 or 74AHC574PW,118 as direct replacements for CD74HC377PW?

A: These parts are functionally compatible but not direct pin-for-pin equivalents. The 74AHC series offers superior performance (120 MHz clock frequency, 10.1 ns propagation delay, 4 µA quiescent current) but operates at reduced maximum supply voltage (5.5V vs. 6V) and narrower temperature range (–40°C to 125°C vs. –55°C to 125°C). Use only if your design operates within 2V–5.5V supply range and –40°C to 125°C temperature limits.

Q: What is the difference between 74HC377PW,118 and 74HC377PW-Q100J?

A: Both are Nexperia 74HC377 variants in identical 20-TSSOP packaging. The 74HC377PW-Q100J carries automotive-grade qualification (AEC-Q100) with improved specifications (83 MHz clock, 27 ns propagation delay vs. 60 MHz, 30 ns). The 74HC377PW,118 is the standard commercial variant. Select the Q100J variant for automotive applications or designs requiring enhanced reliability margins.

Q: Why do some substitute parts have tri-state outputs while the original CD74HC377PW does not?

A: The 74VHC574 and 74AHC574 series provide tri-state output control, enabling multiple devices to share a common bus with output enable/disable capability. The original CD74HC377PW has non-inverted outputs only. Tri-state variants are suitable only for designs requiring bus arbitration; standard non-inverted output parts (74HC377, 74AHC374) are required for direct replacement.

Q: Is CD74HC377PWR a suitable replacement for CD74HC377PW?

A: Yes. CD74HC377PWR is the tape-and-reel packaging variant of the same part, manufactured by Texas Instruments with identical electrical specifications. The only difference is packaging format (tube vs. tape-and-reel). This is the recommended direct substitute with 15,677 units in active inventory.

Q: Can I substitute MC74HC377ADTR2G for CD74HC377PW?

A: MC74HC377ADTR2G is functionally compatible but exhibits reduced performance (35 MHz clock frequency, 27 ns propagation delay). This part is marked obsolete and should be avoided unless legacy design constraints require it. Use active alternatives such as 74HC377PW,118 or CD74HC377PWR instead.

Q: What are the package compatibility requirements for substitution?

A: All substitute parts must use the 20-TSSOP (0.173", 4.40mm Width) surface mount package with identical pinout. This ensures mechanical and electrical compatibility without PCB redesign. Verify package designation in the part number or datasheet before procurement.

Q: Do all substitute parts meet RoHS3 compliance?

A: Yes. All active substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing processes and storage requirements.

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