SN74HC273PWT Equivalent & Substitute Parts

Part Overview

The SN74HC273PWT is a D-Type flip-flop logic integrated circuit manufactured by Texas Instruments, featuring 1 element with 8-bit capacity and positive edge triggering. This component is classified as discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and procurement. The part operates across a 2V to 6V supply range with a maximum propagation delay of 27ns at 6V with 50pF load, suitable for general-purpose digital logic applications requiring edge-triggered storage.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74HC273PWT
Manufacturer	Texas Instruments
Base Product Number	74HC273
Type	D-Type Flip-Flop
Number of Elements	1
Number of Bits per Element	8
Trigger Type	Positive Edge
Output Type	Non-Inverted
Function	Master Reset
Clock Frequency	60 MHz
Max Propagation Delay @ 6V, 50pF	27ns
Voltage - Supply	2V ~ 6V
Current - Output High, Low	5.2mA, 5.2mA
Current - Quiescent (Iq)	8 µA
Input Capacitance	3 pF
Operating Temperature	-40°C ~ 85°C
Package / Case	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution of the SN74HC273PWT is determined by strict equivalence across the following critical parameters:

Core Functional Parameters:

Base product number: 74HC273
Type: D-Type flip-flop
Number of elements: 1
Number of bits per element: 8
Trigger type: Positive edge
Output type: Non-inverted
Package / Case: 20-TSSOP (0.173", 4.40mm Width)
Mounting type: Surface mount

Electrical Operating Parameters:

Voltage supply range: 2V ~ 6V
Trigger type: Positive edge
Output configuration: Non-inverted

Compliance & Environmental:

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)
REACH Status: REACH Unaffected

Substitute parts are grouped by product status (active vs. discontinued) and packaging format (Tape & Reel, Cut Tape, Tube, or Bulk). All listed substitutes maintain identical package geometry and mounting specifications, ensuring direct PCB compatibility without layout modifications.

Parameter Comparison

Parameter	SN74HC273PWT (Main)	SN74HC273PWR	MC74HC273ADTR2G	74HC273PW,118	74HC273PW-Q100J	MC74HC273ADTG	MM74HC273MTC	MM74HC273MTCX
Manufacturer	Texas Instruments	Texas Instruments	onsemi	Nexperia USA Inc.	Nexperia USA Inc.	onsemi	Fairchild Semiconductor	Fairchild Semiconductor
Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type
Number of Elements	1	1	1	1	1	1	1	1
Number of Bits per Element	8	8	8	8	8	8	8	8
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Output Type	Non-Inverted	Non-Inverted	Non-Inverted	Non-Inverted	Non-Inverted	Non-Inverted	Non-Inverted	Non-Inverted
Clock Frequency	60 MHz	60 MHz	35 MHz	122 MHz	122 MHz	35 MHz	78 MHz	78 MHz
Max Propagation Delay @ 6V, 50pF	27ns	27ns	25ns	26ns	26ns	25ns	23ns	23ns
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
Current - Output High, Low	5.2mA, 5.2mA	5.2mA, 5.2mA	7.8mA, 7.8mA	5.2mA, 5.2mA	5.2mA, 5.2mA	7.8mA, 7.8mA	5.2mA, 5.2mA	5.2mA, 5.2mA
Current - Quiescent (Iq)	8 µA	8 µA	4 µA	8 µA	8 µA	4 µA	8 µA	8 µA
Input Capacitance	3 pF	3 pF	10 pF	4.6 pF	4.6 pF	10 pF	7 pF	7 pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-TSSOP	20-TSSOP	20-TSSOP	20-TSSOP	20-TSSOP	20-TSSOP	20-TSSOP	20-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	Not specified
Product Status	Discontinued	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitute - SN74HC273PWR (Texas Instruments)

SN74HC273PWR is the direct parametric equivalent manufactured by Texas Instruments with active product status. This part maintains identical electrical specifications, operating temperature range (-40°C ~ 85°C), and output current ratings (5.2mA). The only difference is packaging format (Cut Tape & Digi-Reel versus Tape & Reel), which does not affect electrical performance or PCB compatibility. This substitute is recommended for applications requiring continuity with the original Texas Instruments design lineage.

Secondary Substitute - 74HC273PW,118 (Nexperia USA Inc.)

The 74HC273PW,118 offers extended operating temperature range (-40°C ~ 125°C) and higher clock frequency (122 MHz) compared to the original part. This substitute is suitable for applications requiring enhanced thermal performance or higher-speed operation. ROHS3 compliance and identical package geometry ensure direct substitution capability.

Secondary Substitute - 74HC273PW-Q100J (Nexperia USA Inc.)

The 74HC273PW-Q100J is qualified to AEC-Q100 automotive standards with identical electrical specifications to 74HC273PW,118. This part is appropriate for automotive-grade applications requiring formal qualification documentation. Extended operating temperature range (-40°C ~ 125°C) provides additional thermal margin.

Alternative Substitute - MC74HC273ADTR2G (onsemi)

MC74HC273ADTR2G is manufactured by onsemi with active product status and extended operating temperature range (-55°C ~ 125°C). This part exhibits lower quiescent current (4 µA versus 8 µA) and faster propagation delay (25ns versus 27ns), making it suitable for low-power or high-speed applications. Higher input capacitance (10 pF) and output current (7.8mA) should be evaluated against circuit requirements.

Alternative Substitute - MC74HC273ADTG (onsemi)

MC74HC273ADTG is the tube-packaged variant of MC74HC273ADTR2G with identical electrical specifications. This packaging format is suitable for applications requiring bulk component handling or specific procurement workflows.

Alternative Substitute - MM74HC273MTC and MM74HC273MTCX (Fairchild Semiconductor)

Both MM74HC273MTC and MM74HC273MTCX are manufactured by Fairchild Semiconductor with active product status. These parts offer the fastest propagation delay (23ns) and lowest input capacitance (7 pF) among all substitutes, making them suitable for high-speed logic applications. Operating temperature range remains -40°C ~ 85°C, matching the original part.

Frequently Asked Questions (FAQ)

Q: Can SN74HC273PWR be used as a direct replacement for SN74HC273PWT?

A: Yes. SN74HC273PWR is a direct parametric equivalent with identical electrical specifications, supply voltage range (2V ~ 6V), propagation delay (27ns @ 6V, 50pF), output current (5.2mA), and operating temperature range (-40°C ~ 85°C). The only difference is packaging format (Cut Tape & Digi-Reel versus Tape & Reel), which does not affect circuit performance or PCB layout.

Q: What is the difference between the onsemi and Fairchild substitutes?

A: onsemi parts (MC74HC273ADTR2G, MC74HC273ADTG) feature extended operating temperature range (-55°C ~ 125°C), lower quiescent current (4 µA), and faster propagation delay (25ns). Fairchild parts (MM74HC273MTC, MM74HC273MTCX) offer the fastest propagation delay (23ns) and lowest input capacitance (7 pF) but maintain the original operating temperature range (-40°C ~ 85°C). Selection depends on thermal and speed requirements.

Q: Are all substitutes compatible with the original PCB layout?

A: Yes. All listed substitutes use the identical 20-TSSOP (0.173", 4.40mm Width) package with surface mount configuration. No PCB layout modifications are required for electrical or mechanical compatibility.

Q: Which substitute is recommended for automotive applications?

A: The 74HC273PW-Q100J is qualified to AEC-Q100 automotive standards and is the appropriate choice for automotive-grade designs. This part maintains identical electrical specifications to 74HC273PW,118 while providing formal qualification documentation.

Q: What is the significance of the extended operating temperature range in some substitutes?

A: Extended operating temperature range (-40°C ~ 125°C versus -40°C ~ 85°C) provides additional thermal margin for applications operating in high-temperature environments or with limited thermal management. This specification does not affect electrical performance within the original temperature range.

Q: Can I use MC74HC273ADTR2G in a design originally specified for SN74HC273PWT?

A: Yes, with circuit evaluation. MC74HC273ADTR2G maintains functional equivalence but exhibits different electrical characteristics: lower quiescent current (4 µA versus 8 µA), faster propagation delay (25ns versus 27ns), higher output current (7.8mA versus 5.2mA), and higher input capacitance (10 pF versus 3 pF). These differences are generally compatible with 74HC273 logic designs but should be evaluated against specific circuit timing and power requirements.

Q: What packaging formats are available for the 74HC273 base product?

A: Substitutes are available in multiple packaging formats: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel, Tube, and Bulk. All maintain the identical 20-TSSOP component package. Selection depends on procurement volume and handling requirements.

Q: Are all substitutes RoHS3 compliant?

A: Texas Instruments (SN74HC273PWR) and Nexperia (74HC273PW,118, 74HC273PW-Q100J) substitutes are explicitly ROHS3 compliant. onsemi and Fairchild parts do not specify RoHS status in the provided data. Verify RoHS compliance with the manufacturer if required for your application.

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