SN74LS273NS Equivalent & Substitute Parts

Part Overview

The SN74LS273NS is a Logic category integrated circuit manufactured by Texas Instruments, classified as a Flip Flop 1 Element D-Type 8 Bit Positive Edge device in 20-SOIC packaging. This component functions as a master reset flip-flop with non-inverted output, operating at a maximum clock frequency of 40 MHz. The part is currently discontinued at DiGi Electronics, necessitating identification of equivalent substitute components for ongoing design requirements and procurement needs.

Substiute Parts

SN74LS273NS

Texas InstrumentsIn Stock: 6087SN74LS273NS Datasheet

Current PartRFQ

SN74LS273NSR

Texas InstrumentsIn Stock: 2215SN74LS273NSR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS273NS is determined by strict equivalence across the following critical parameters:

Functional Parameters: Type (D-Type Flip Flop), Number of Elements (1), Number of Bits per Element (8), Trigger Type (Positive Edge), Output Type (Non-Inverted), and Function (Master Reset) must remain identical.

Electrical Parameters: Clock Frequency (40 MHz), Max Propagation Delay (27 ns @ 5V, 15pF), Current - Output High and Low (400µA, 8mA), Voltage - Supply (4.75V ~ 5.25V), and Current - Quiescent (27 mA) must match exactly.

Physical Parameters: Mounting Type (Surface Mount) and Package / Case (20-SOIC, 0.209", 5.30mm Width) must be identical.

Compliance Parameters: RoHS Status (ROHS3 Compliant) and Moisture Sensitivity Level (1, Unlimited) must be maintained.

The SN74LS273NSR qualifies as a direct substitute based on complete alignment with all specified parameters.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS273NSR serves as the direct equivalent substitute for the discontinued SN74LS273NS. Both components are manufactured by Texas Instruments and maintain identical electrical, functional, and physical specifications. The primary distinction is product status: the SN74LS273NS is discontinued, while the SN74LS273NSR remains in active production.

Both parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with current manufacturing and environmental standards. The SN74LS273NSR is available in Cut Tape (CT) and Digi-Reel® packaging formats, providing flexibility for procurement volumes.

For applications currently utilizing the SN74LS273NS, direct substitution with the SN74LS273NSR is supported without circuit modification or re-qualification, as all specified parameters remain constant.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS273NSR directly replace the SN74LS273NS in existing designs?

A: Yes. The SN74LS273NSR is a direct equivalent substitute. All electrical parameters, functional characteristics, and physical specifications are identical. No circuit modifications are required.

Q: What is the difference between SN74LS273NS and SN74LS273NSR?

A: The primary difference is packaging format and product status. The SN74LS273NS is discontinued, while the SN74LS273NSR is actively produced and available in Cut Tape (CT) and Digi-Reel® packaging options.

Q: Are both parts compatible with the same PCB footprint?

A: Yes. Both components use identical 20-SOIC (0.209", 5.30mm Width) surface mount packaging, ensuring footprint compatibility without PCB redesign.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the SN74LS273NS and SN74LS273NSR are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating.

Q: What are the key electrical parameters that define substitution compatibility?

A: Clock Frequency (40 MHz), Max Propagation Delay (27 ns @ 5V, 15pF), Output Current specifications (400µA, 8mA), Supply Voltage range (4.75V ~ 5.25V), and Quiescent Current (27 mA) must remain constant for substitution validity.

Q: Can this part be used in applications requiring higher operating temperatures?

A: No. Both parts are specified for 0°C ~ 70°C (TA) operating temperature range. Applications requiring extended temperature ranges require alternative component selection.