DM74ALS273SJ Equivalent & Substitute Parts

Part Overview

The DM74ALS273SJ is a D-Type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit capacity and positive edge triggering. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The 74ALS series provides standard logic functionality with established pin compatibility across multiple manufacturers and packaging variants.

Key Parameters

Parameter	Value
Series	74ALS
Type	D-Type Flip Flop
Number of Elements	1
Number of Bits per Element	8
Clock Frequency	35 MHz
Max Propagation Delay	15 ns @ 5V, 50pF
Trigger Type	Positive Edge
Output Type	Non-Inverted
Voltage Supply Range	4.5V ~ 5.5V
Current - Output High, Low	2.6 mA, 24 mA
Current - Quiescent	20 mA
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the DM74ALS273SJ is determined by strict equivalence across the following parameters: series designation (74ALS), functional type (D-Type flip-flop), element count (1), bit capacity (8), clock frequency (35 MHz), propagation delay (15 ns @ 5V, 50pF), trigger mechanism (positive edge), output configuration (non-inverted), supply voltage range (4.5V ~ 5.5V), output current specifications (2.6 mA high, 24 mA low), quiescent current (20 mA), operating temperature range (0°C ~ 70°C), and surface mount technology.

Substitute parts are grouped into two categories based on package physical dimensions:

Group 1 - Narrow Body (0.209" width): SN74ALS273NSR maintains identical package dimensions to the original DM74ALS273SJ.

Group 2 - Wide Body (0.295" width): SN74ALS273DW and SN74ALS273DWR feature increased package width but maintain all electrical and functional specifications.

Parameter Comparison

Parameter	DM74ALS273SJ	SN74ALS273NSR	SN74ALS273DW	SN74ALS273DWR
Manufacturer	onsemi	Texas Instruments	Texas Instruments	Texas Instruments
Series	74ALS	74ALS	74ALS	74ALS
Type	D-Type Flip Flop	D-Type Flip Flop	D-Type Flip Flop	D-Type Flip Flop
Number of Elements	1	1	1	1
Number of Bits per Element	8	8	8	8
Clock Frequency	35 MHz	35 MHz	35 MHz	35 MHz
Max Propagation Delay @ V, Max CL	15 ns @ 5V, 50pF	15 ns @ 5V, 50pF	15 ns @ 5V, 50pF	15 ns @ 5V, 50pF
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Output Type	Non-Inverted	Non-Inverted	Non-Inverted	Non-Inverted
Current - Output High, Low	2.6 mA, 24 mA	2.6 mA, 24 mA	2.6 mA, 24 mA	2.6 mA, 24 mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Quiescent (Iq)	20 mA	20 mA	20 mA	20 mA
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	20-SOIC (0.209", 5.30mm Width)	20-SOIC (0.209", 5.30mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)
Product Status	Obsolete	Active	Last Time Buy	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute - SN74ALS273NSR (Texas Instruments): This part provides direct substitution with identical package dimensions (0.209" width, 20-SOIC). Active product status ensures long-term availability and supply chain stability. ROHS3 compliance supports modern manufacturing and environmental standards. Inventory availability of 2,732 pieces supports immediate procurement.

Secondary Substitutes - SN74ALS273DW and SN74ALS273DWR (Texas Instruments): Both parts maintain full electrical equivalence but feature wider package dimensions (0.295" width). SN74ALS273DWR is preferred due to active product status and higher inventory (3,015 pieces). SN74ALS273DW carries Last Time Buy status, indicating limited future availability. These options require PCB layout modification to accommodate increased package width.

Obsolescence Consideration: The original DM74ALS273SJ is obsolete. Texas Instruments SN74ALS273NSR or SN74ALS273DWR are recommended for new designs and long-term production continuity.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS273DW or SN74ALS273DWR be used as direct drop-in replacements for DM74ALS273SJ?

A: Electrically, yes. All three parts share identical functional specifications, electrical characteristics, and pin configurations. However, SN74ALS273DW and SN74ALS273DWR have wider package bodies (0.295" versus 0.209"), requiring PCB footprint modification. SN74ALS273NSR provides true drop-in compatibility with matching package dimensions.

Q: What is the difference between SN74ALS273DW and SN74ALS273DWR?

A: Both parts are electrically identical with the same package dimensions (0.295" width). The primary difference is product status: SN74ALS273DWR is Active, while SN74ALS273DW is Last Time Buy. SN74ALS273DWR is recommended for new designs due to sustained availability.

Q: Are all substitute parts RoHS compliant?

A: Yes. SN74ALS273NSR, SN74ALS273DW, and SN74ALS273DWR are all ROHS3 compliant. The original DM74ALS273SJ RoHS status was not specified in available documentation.

Q: What packaging formats are available for these substitutes?

A: SN74ALS273NSR is supplied in Cut Tape (CT) & Digi-Reel format. SN74ALS273DW is supplied in Tube format. SN74ALS273DWR is supplied in Cut Tape (CT) & Digi-Reel format.

Q: Can I use these parts interchangeably in existing designs?

A: SN74ALS273NSR is fully interchangeable without design modification. SN74ALS273DW and SN74ALS273DWR require PCB layout changes due to package width differences, though electrical performance remains identical.

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