SN74HC273DW Equivalent & Substitute Parts

Part Overview

The SN74HC273DW 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 a Master Reset function device in the 74HC logic series. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing design requirements and production needs. Substitute parts must maintain functional compatibility across electrical characteristics, package specifications, and operational parameters.

Key Parameters

Parameter	Value
Type	D-Type Flip Flop
Number of Elements	1
Number of Bits per Element	8
Clock Frequency	60 MHz
Max Propagation Delay @ 6V, 50pF	13 ns
Trigger Type	Positive Edge
Output Type	Non-Inverted
Current - Output High, Low	5.2 mA, 5.2 mA
Voltage - Supply	2V ~ 6V
Current - Quiescent (Iq)	8 µA
Input Capacitance	3 pF
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SN74HC273DW is determined by strict adherence to the following critical parameters:

Mandatory Compatibility Parameters:

Package / Case: 20-SOIC (0.295", 7.50mm Width) — all substitutes must use identical package
Type: D-Type Flip Flop with 1 element, 8-bit configuration
Trigger Type: Positive Edge
Output Type: Non-Inverted
Voltage - Supply: 2V ~ 6V range
Mounting Type: Surface Mount

Performance Parameters (must meet or exceed):

Clock Frequency: minimum 60 MHz
Max Propagation Delay @ 6V, 50pF: maximum 13 ns
Current - Output High, Low: maximum 5.2 mA each
Current - Quiescent (Iq): maximum 8 µA
Operating Temperature: minimum -40°C to 85°C range

Compliance Parameters:

RoHS Status: ROHS3 Compliant
Base Product Number: 74HC273

Substitutes are grouped into two categories: direct equivalents (identical electrical and packaging specifications) and functional equivalents (meet all mandatory parameters with acceptable performance variations).

Parameter Comparison

Parameter	SN74HC273DW (Main)	SN74HC273DWR	MC74HC273ADWR2G	74HC273D,653	74HC273D-Q100J	MC74HC273ADWG	MM74HC273WM	MM74HC273WMX
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
Clock Frequency	60 MHz	60 MHz	35 MHz	122 MHz	122 MHz	35 MHz	78 MHz	78 MHz
Max Propagation Delay @ 6V, 50pF	13 ns	13 ns	25 ns	26 ns	26 ns	25 ns	23 ns	23 ns
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
Current - Output High, Low	5.2 mA, 5.2 mA	5.2 mA, 5.2 mA	7.8 mA, 7.8 mA	5.2 mA, 5.2 mA	5.2 mA, 5.2 mA	7.8 mA, 7.8 mA	5.2 mA, 5.2 mA	5.2 mA, 5.2 mA
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
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-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)
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
Packaging Format	Tube	Cut Tape & Digi-Reel	Cut Tape & Digi-Reel	Cut Tape & Digi-Reel	Tape & Reel	Tube	Not specified	Bulk

Engineering Selection Recommendations

Primary Substitute: SN74HC273DWR

The SN74HC273DWR from Texas Instruments is the direct functional equivalent to the SN74HC273DW. It maintains identical electrical specifications including 60 MHz clock frequency, 13 ns maximum propagation delay, and 5.2 mA output current ratings. The part is currently in active production status with 5100 units in stock. Both parts share the same base product number (74HC273) and are ROHS3 compliant. The primary difference is packaging format: SN74HC273DWR is supplied in Cut Tape and Digi-Reel format rather than Tube, which may affect procurement and assembly workflows.

Secondary Substitutes: 74HC273D,653 and 74HC273D-Q100J

Both Nexperia USA Inc. parts (74HC273D,653 and 74HC273D-Q100J) exceed the performance specifications of the original SN74HC273DW with 122 MHz clock frequency and 26 ns maximum propagation delay. These parts maintain identical output current ratings (5.2 mA) and quiescent current (8 µA). The 74HC273D-Q100J includes AEC-Q100 automotive qualification, suitable for applications requiring automotive-grade components. Both parts support extended operating temperature range to 125°C, providing additional thermal margin. ROHS3 compliance is confirmed for both variants.

Alternative Substitutes: MC74HC273ADWR2G and MC74HC273ADWG

The onsemi parts (MC74HC273ADWR2G and MC74HC273ADWG) provide functional substitution with trade-offs in performance characteristics. Clock frequency is reduced to 35 MHz with 25 ns maximum propagation delay. Output current increases to 7.8 mA per line, and quiescent current decreases to 4 µA. Operating temperature range extends to -55°C to 125°C. These parts are suitable for applications where lower clock speeds are acceptable and extended temperature operation is required. Moisture sensitivity level is MSL 3 (168 hours) compared to MSL 1 for the original part.

Tertiary Substitutes: MM74HC273WM and MM74HC273WMX

Fairchild Semiconductor parts (MM74HC273WM and MM74HC273WMX) provide functional substitution with 78 MHz clock frequency and 23 ns maximum propagation delay. Output current and quiescent current specifications match the original part (5.2 mA and 8 µA respectively). Operating temperature range is -40°C to 85°C, identical to the original. RoHS compliance status is not specified in available documentation. MM74HC273WMX is supplied in bulk packaging format.

Selection Criteria Summary:

For direct replacement with active product status: SN74HC273DWR
For enhanced performance specifications: 74HC273D,653 or 74HC273D-Q100J
For extended temperature operation: MC74HC273ADWR2G, MC74HC273ADWG, or 74HC273D-Q100J
For automotive applications: 74HC273D-Q100J (AEC-Q100 qualified)
For cost-optimized alternatives: MM74HC273WM or MM74HC273WMX

Frequently Asked Questions (FAQ)

Q: Can I use SN74HC273DWR as a direct replacement for SN74HC273DW?

A: Yes. The SN74HC273DWR is electrically and functionally identical to the SN74HC273DW. Both parts share the same base product number (74HC273), identical electrical specifications (60 MHz clock frequency, 13 ns propagation delay, 5.2 mA output current), and the same 20-SOIC package. The primary difference is packaging format: SN74HC273DWR is supplied in Cut Tape and Digi-Reel format rather than Tube. Both are ROHS3 compliant and suitable for direct PCB substitution.

Q: What are the key differences between the Texas Instruments and Nexperia substitutes?

A: The Nexperia parts (74HC273D,653 and 74HC273D-Q100J) offer superior clock frequency performance at 122 MHz compared to 60 MHz for the Texas Instruments SN74HC273DWR. Propagation delay increases slightly to 26 ns. Both maintain identical output current (5.2 mA) and quiescent current (8 µA) specifications. The 74HC273D-Q100J includes AEC-Q100 automotive qualification and supports extended operating temperature to 125°C. All three parts use the same 20-SOIC package and are ROHS3 compliant.

Q: Are the onsemi parts (MC74HC273ADWR2G and MC74HC273ADWG) suitable substitutes?

A: The onsemi parts are functional substitutes with performance trade-offs. Clock frequency is reduced to 35 MHz with 25 ns maximum propagation delay. Output current increases to 7.8 mA per line, and quiescent current decreases to 4 µA. Operating temperature range extends to -55°C to 125°C, providing additional thermal margin. Moisture sensitivity level is MSL 3 (168 hours) compared to MSL 1 for the original part. These parts are suitable for applications where lower clock speeds are acceptable and extended temperature operation is required.

Q: Do all substitute parts use the same 20-SOIC package?

A: Yes. All substitute parts listed use the identical 20-SOIC (0.295", 7.50mm Width) package. This ensures mechanical and electrical compatibility with existing PCB layouts and socket designs. No package adapter or redesign is required for substitution.

Q: Which substitute part is recommended for automotive applications?

A: The 74HC273D-Q100J from Nexperia USA Inc. is qualified to AEC-Q100 automotive standards. This part meets automotive-grade reliability and performance requirements while maintaining superior clock frequency (122 MHz) and extended operating temperature range (-40°C to 125°C). ROHS3 compliance is confirmed.

Q: What is the difference between Cut Tape, Digi-Reel, Tube, and Bulk packaging formats?

A: Packaging format affects procurement and assembly processes. Tube packaging (original SN74HC273DW) is used for manual handling and smaller quantities. Cut Tape and Digi-Reel format (SN74HC273DWR) is optimized for automated pick-and-place assembly equipment. Tape & Reel format (74HC273D-Q100J) is standard for high-volume production. Bulk packaging (MM74HC273WMX) is used for component distribution without tape or reel. All formats contain identical components; selection depends on assembly process requirements.

Q: Are all substitute parts ROHS3 compliant?

A: ROHS3 compliance is confirmed for SN74HC273DWR, MC74HC273ADWR2G, MC74HC273ADWG, 74HC273D,653, and 74HC273D-Q100J. RoHS compliance status is not specified in available documentation for MM74HC273WM and MM74HC273WMX. Verify RoHS compliance requirements with your procurement specifications before selecting Fairchild Semiconductor parts.

Q: Can I mix different substitute parts in the same production run?

A: All substitute parts are functionally compatible and use the same 20-SOIC package. However, mixing parts from different manufacturers may introduce minor variations in propagation delay, output current, and quiescent current specifications. For consistency in timing-critical applications, maintain single-source procurement within a production batch. Verify timing margins in your circuit design accommodate the maximum propagation delay specification of the selected substitute part.

Q: What is the inventory status of each substitute part?

A: Current inventory levels are: SN74HC273DWR (5100 units), MC74HC273ADWR2G (2300 units), 74HC273D,653 (1900 units), 74HC273D-Q100J (3168 units), MC74HC273ADWG (2244 units), MM74HC273WM (1900 units), and MM74HC273WMX (1990 units). All substitute parts are in active production status with available stock. Verify current inventory with your component supplier before finalizing procurement orders.

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