74HC273N,652 Equivalent & Substitute Parts

Part Overview

The 74HC273N,652 is a D-type flip-flop logic integrated circuit manufactured by NXP USA Inc., designed for 8-bit parallel data storage with positive edge triggering and master reset functionality. This component operates across a 2V to 6V supply range and is packaged in a 20-DIP through-hole configuration. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support, production continuity, and system maintenance.

Key Parameters

Parameter	Value
Manufacturer Part Number	74HC273N,652
Manufacturer	NXP USA Inc.
Category	Logic
Series	74HC
Type	D-Type Flip Flop
Number of Elements	1
Number of Bits per Element	8
Output Type	Non-Inverted
Trigger Type	Positive Edge
Function	Master Reset
Clock Frequency	122 MHz
Max Propagation Delay @ 6V, 50pF	26 ns
Voltage - Supply	2V ~ 6V
Current - Output High, Low	5.2 mA, 5.2 mA
Current - Quiescent (Iq)	8 µA
Input Capacitance	3.5 pF
Operating Temperature	-40°C ~ 125°C
Mounting Type	Through Hole
Package / Case	20-DIP (0.300", 7.62mm)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74HC273N,652 is determined by strict adherence to the following electrical and mechanical parameters:

Core Functional Parameters:

D-Type flip-flop architecture with 8-bit configuration
Positive edge trigger mechanism
Master reset functionality
Non-inverted output type
74HC logic series compatibility

Electrical Compatibility Parameters:

Supply voltage range: 2V ~ 6V
Output current capability: 5.2 mA (high and low)
Quiescent current: 8 µA maximum
Propagation delay: 26 ns or better @ 6V, 50pF load
Input capacitance: within specified range

Mechanical Compatibility Parameters:

Package type: 20-DIP or 20-SOIC (both 0.300" or 0.295" width variants)
Through-hole or surface-mount mounting
Pin configuration compatibility with 74HC273 base product number

Compliance Parameters:

ROHS3 compliance required
REACH unaffected status
EAR99 export classification
HTSUS code: 8542.39.0001

Substitute parts must maintain all core functional parameters while meeting or exceeding electrical specifications. Package variants (DIP vs. SOIC) are acceptable substitutes provided mounting compatibility is verified in the target application.

Parameter Comparison

Parameter	74HC273N,652 (NXP)	CD74HC273E (TI)	74HC273D,653 (Nexperia)	SN74HC273AN (TI)	SN74HC273N (TI)	SN74HC273NSR (TI)	TC74HC273APF (Toshiba)
Manufacturer	NXP USA Inc.	Texas Instruments	Nexperia USA Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Toshiba Semiconductor
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type
Number of Bits	8	8	8	8	8	8	8
Output Type	Non-Inverted	Non-Inverted	Non-Inverted	Non-Inverted	Non-Inverted	Non-Inverted	Non-Inverted
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Clock Frequency	122 MHz	60 MHz	122 MHz	72 MHz	60 MHz	60 MHz	66 MHz
Max Propagation Delay @ 6V, 50pF	26 ns	26 ns	26 ns	25 ns	27 ns	27 ns	25 ns
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	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	5.2 mA, 5.2 mA	5.2 mA, 5.2 mA	5.2 mA, 5.2 mA
Current - Quiescent (Iq)	8 µA	8 µA	8 µA	8 µA	8 µA	8 µA	4 µA
Input Capacitance	3.5 pF	10 pF	3.5 pF	3 pF	3 pF	3 pF	5 pF
Operating Temperature	-40°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Surface Mount	Through Hole	Through Hole	Surface Mount	Through Hole
Package / Case	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)	20-SOIC (0.295", 7.50mm)	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)	20-SOIC (0.209", 5.30mm)	20-DIP (0.300", 7.62mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Not Applicable	1 (Unlimited)	Not Applicable	Not Applicable	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Through-Hole DIP Replacements (Pin-Compatible):

SN74HC273N (Texas Instruments) and TC74HC273APF (Toshiba Semiconductor) are the primary active substitutes for through-hole 20-DIP applications. Both maintain identical package geometry (0.300", 7.62mm), pin configuration, and electrical performance within specified tolerances. SN74HC273N offers the highest inventory availability (13,452 units) and active product status. TC74HC273APF provides superior quiescent current performance (4 µA vs. 8 µA) and faster propagation delay (25 ns), beneficial for power-sensitive applications.

Surface-Mount SOIC Alternatives:

SN74HC273NSR (Texas Instruments, 20-SOIC 0.209" width) and 74HC273D,653 (Nexperia, 20-SOIC 0.295" width) serve applications requiring surface-mount technology. SN74HC273NSR provides exceptional inventory depth (55,100 units) and is recommended for high-volume production. The 74HC273D,653 maintains the original NXP design specifications including 122 MHz clock frequency and 3.5 pF input capacitance, making it the closest electrical equivalent.

Extended Temperature Range Option:

CD74HC273E (Texas Instruments) extends the operating temperature range to -55°C ~ 125°C, suitable for industrial and military-grade applications requiring enhanced thermal performance. This part maintains 26 ns propagation delay and full electrical compatibility.

Compliance and Regulatory Alignment:

All substitute parts maintain ROHS3 compliance, REACH unaffected status, and EAR99 export classification, ensuring regulatory continuity. Selection should prioritize active product status to ensure long-term availability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can SN74HC273N directly replace 74HC273N,652 in existing PCB designs?

A: Yes. Both parts use identical 20-DIP through-hole packaging (0.300", 7.62mm pitch) and pin configuration. Electrical specifications are compatible across all critical parameters including supply voltage (2V ~ 6V), output current (5.2 mA), and propagation delay (27 ns vs. 26 ns). The primary difference is product status: the original is obsolete while SN74HC273N is active.

Q: What is the difference between 74HC273D,653 and SN74HC273NSR?

A: Both are active substitutes but differ in package type and manufacturer. 74HC273D,653 uses 20-SOIC (0.295" width) surface-mount packaging from Nexperia, while SN74HC273NSR uses 20-SOIC (0.209" width) surface-mount packaging from Texas Instruments. The narrower 0.209" width of SN74HC273NSR is more common in modern PCB designs. Electrical performance is equivalent.

Q: Is CD74HC273E suitable for high-temperature applications?

A: CD74HC273E extends the operating temperature range to -55°C ~ 125°C compared to the standard -40°C ~ 85°C range of most substitutes. This makes it appropriate for industrial, automotive, and military applications requiring enhanced thermal specifications. All other electrical parameters remain compatible.

Q: Can I use TC74HC273APF instead of SN74HC273N?

A: Yes. Both are through-hole 20-DIP packages with compatible pin configurations. TC74HC273APF offers lower quiescent current (4 µA vs. 8 µA) and faster propagation delay (25 ns vs. 27 ns), making it suitable for power-constrained or timing-critical applications. Clock frequency is slightly lower (66 MHz vs. 60 MHz) but remains well above typical application requirements.

Q: What inventory considerations should guide part selection?

A: SN74HC273N offers the highest inventory availability (13,452 units), followed by SN74HC273NSR (55,100 units for surface-mount applications). For immediate availability in through-hole DIP format, SN74HC273N is the recommended choice. TC74HC273APF and CD74HC273E have lower inventory levels (855 and 1,175 units respectively) and should be selected only when their specific performance characteristics are required.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, REACH unaffected status, and EAR99 export classification, ensuring regulatory alignment with the original 74HC273N,652 specification.

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