DM74ALS574ASJX Equivalent & Substitute Parts

Part Overview

The DM74ALS574ASJX is a flip-flop logic integrated circuit featuring a single D-type element with 8-bit capacity, designed for digital signal storage and transfer applications. This component operates as a positive edge-triggered device with tri-state, non-inverted outputs. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Base Product Number	74ALS574
Type	D-Type Flip Flop
Number of Elements	1
Number of Bits per Element	8
Output Type	Tri-State, Non-Inverted
Clock Frequency	35 MHz
Max Propagation Delay	14 ns @ 5V, 50pF
Trigger Type	Positive Edge
Voltage Supply Range	4.5V ~ 5.5V
Current - Output High, Low	2.6 mA, 24 mA
Current - Quiescent (Iq)	18 mA
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	20-SOIC
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the DM74ALS574ASJX is determined by strict equivalence across the following critical parameters:

Functional Architecture: Single D-type flip-flop element with 8-bit capacity
Output Configuration: Tri-state, non-inverted outputs
Electrical Performance: 35 MHz clock frequency, 14 ns maximum propagation delay at 5V with 50pF load
Trigger Mechanism: Positive edge triggering
Power Supply: 4.5V to 5.5V operating range
Output Drive Capability: 2.6 mA high, 24 mA low
Quiescent Current: 18 mA
Temperature Range: 0°C to 70°C
Package Family: 20-SOIC form factor

All substitute parts listed maintain identical electrical and functional specifications. Variations in package width dimensions and product status are noted but do not affect functional interchangeability within the specified electrical parameters.

Parameter Comparison

Parameter	DM74ALS574ASJX (onsemi)	SN74ALS574BNSR (TI)	SN74ALS574BDW (TI)	SN74ALS574BDWR (TI)
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
Output Type	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted
Clock Frequency	35 MHz	35 MHz	35 MHz	35 MHz
Max Propagation Delay @ 5V, 50pF	14 ns	14 ns	14 ns	14 ns
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Output High, Low	2.6 mA, 24 mA	2.6 mA, 24 mA	2.6 mA, 24 mA	2.6 mA, 24 mA
Current - Quiescent (Iq)	18 mA	18 mA	18 mA	18 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)	20-SOIC (0.209", 5.30mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)
Product Status	Obsolete	Active	Last Time Buy	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SN74ALS574BNSR (Texas Instruments) is the primary recommended substitute. This part maintains identical electrical specifications and package dimensions (20-SOIC 0.209", 5.30mm width) to the DM74ALS574ASJX. The component carries Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment for new designs.

SN74ALS574BDWR (Texas Instruments) provides an alternative with Active product status and ROHS3 compliance. This part features a wider 20-SOIC package (0.295", 7.50mm width) and is supplied in Cut Tape and Digi-Reel packaging formats. PCB layout modifications are required to accommodate the increased package width.

SN74ALS574BDW (Texas Instruments) is available with Last Time Buy status, indicating limited future availability. This variant also features the wider 20-SOIC package (0.295", 7.50mm width) and is supplied in Tube packaging. Selection of this part should be limited to applications where inventory consolidation or existing stock utilization is prioritized.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS574BNSR directly replace DM74ALS574ASJX without PCB modifications?

A: Yes. SN74ALS574BNSR maintains identical package dimensions (20-SOIC 0.209", 5.30mm width), pin configuration, and electrical specifications. Direct substitution on existing PCBs is possible without layout changes.

Q: What is the difference between SN74ALS574BNSR and SN74ALS574BDWR?

A: Both parts are functionally and electrically identical. The primary differences are package width (0.209" versus 0.295") and packaging format (20-SO versus Cut Tape/Digi-Reel). SN74ALS574BNSR matches the original DM74ALS574ASJX package dimensions exactly.

Q: Why do SN74ALS574BDW and SN74ALS574BDWR have different package widths than the original part?

A: The wider 20-SOIC package (0.295", 7.50mm width) represents a different physical form factor within the 20-SOIC family. These variants require PCB footprint modifications and cannot be used as direct drop-in replacements without layout redesign.

Q: Is the DM74ALS574ASJX still available for purchase?

A: The DM74ALS574ASJX is classified as obsolete. Existing inventory may be available through component distributors, but long-term supply is not guaranteed. Transition to an active substitute part is recommended for new designs and ongoing production.

Q: Are all substitute parts RoHS compliant?

A: Yes. All Texas Instruments substitute parts (SN74ALS574BNSR, SN74ALS574BDW, SN74ALS574BDWR) are ROHS3 compliant. The original DM74ALS574ASJX RoHS status is not specified in available documentation.

Q: What is the difference in product status between the substitute parts?

A: SN74ALS574BNSR and SN74ALS574BDWR carry Active status, indicating ongoing production and long-term availability. SN74ALS574BDW is designated Last Time Buy, meaning production is ending and inventory is limited. For new designs, Active status parts are preferred.

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