SN74LS73AD Equivalent & Substitute Parts

Part Overview

The SN74LS73AD is a dual 1-bit JK-type flip-flop logic integrated circuit manufactured by Texas Instruments in 14-SOIC surface mount packaging. This component functions as a reset-capable sequential logic element with complementary outputs, operating at a maximum clock frequency of 45 MHz. The SN74LS73AD is classified as Last Time Buy, indicating discontinued production status. Identifying equivalent substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications currently utilizing this component.

Substiute Parts

SN74LS73AD

Texas InstrumentsIn Stock: 1371SN74LS73AD Datasheet

Current PartRFQ

SN74LS73ADR

Texas InstrumentsIn Stock: 6595SN74LS73ADR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74LS73AD is determined by strict equivalence across the following critical parameters:

Functional Parameters: Type (JK Type), Number of Elements (2), Number of Bits per Element (1), Output Type (Complementary), Trigger Type (Negative Edge), and Function (Reset).

Electrical Parameters: Clock Frequency (45 MHz), Max Propagation Delay (20 ns @ 5V, 15pF), Voltage Supply Range (4.75V ~ 5.25V), Current Output specifications (400µA, 8mA), and Quiescent Current (6 mA).

Physical Parameters: Package / Case (14-SOIC with 0.154", 3.90mm Width) and Mounting Type (Surface Mount).

Compliance Parameters: RoHS3 Compliance, MSL Level 1, and REACH Unaffected status.

Substitute parts must match all specified parameters without deviation. Packaging format differences (Tube versus Tape & Reel) do not affect functional or electrical equivalence.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS73ADR is the manufacturer-recommended substitute for the SN74LS73AD. Both parts are manufactured by Texas Instruments and maintain identical electrical, functional, and physical specifications. The primary distinction is product status: the SN74LS73AD is Last Time Buy (discontinued), while the SN74LS73ADR maintains Active status with significantly higher inventory availability (6543 Pcs versus 1282 Pcs).

Both parts satisfy ROHS3 compliance requirements and maintain REACH Unaffected status, ensuring regulatory alignment for current and future applications. The packaging format difference (Tube versus Tape & Reel) reflects supply chain configuration only and does not affect component performance or compatibility.

For new designs or ongoing production requiring long-term supply assurance, the SN74LS73ADR is the appropriate selection. For existing designs currently utilizing the SN74LS73AD, direct substitution with the SN74LS73ADR is electrically and mechanically valid without design modification.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS73ADR directly replace the SN74LS73AD in existing designs?

A: Yes. The SN74LS73ADR is electrically and mechanically equivalent to the SN74LS73AD. All functional parameters, electrical specifications, and physical dimensions are identical. No design changes are required.

Q: What is the difference between Tube and Tape & Reel packaging?

A: Tube and Tape & Reel are packaging and delivery formats only. Tube packaging is used for manual handling and smaller quantities, while Tape & Reel is optimized for automated assembly processes and higher volumes. The components themselves are identical.

Q: Why is the SN74LS73AD marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this part number. The SN74LS73ADR remains in active production and is the recommended long-term alternative.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both the SN74LS73AD and SN74LS73ADR maintain identical RoHS3 compliance, MSL Level 1 rating, and REACH Unaffected status.

Q: What are the key parameters that define substitution eligibility for this component?

A: Substitution is based on matching: JK-type flip-flop configuration, dual 1-bit elements with complementary outputs, 45 MHz clock frequency, 20 ns propagation delay, 4.75V–5.25V supply voltage, negative edge triggering, 14-SOIC package, and surface mount mounting type.