SN74LS243NG4 Equivalent & Substitute Parts

Part Overview

The SN74LS243NG4 is a non-inverting transceiver IC manufactured by Texas Instruments, designed for logic-level signal transmission and reception applications. This component features 1 element with 4 bits per element, push-pull output configuration, and operates within a 4.75V to 5.25V supply voltage range. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives to maintain design continuity and procurement availability.

Substiute Parts

SN74LS243NG4

Texas InstrumentsIn Stock: 821SN74LS243NG4 Datasheet

Current PartRFQ

SN74LS243N

Texas InstrumentsIn Stock: 2355SN74LS243N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74LS243NG4 is determined by strict equivalence across the following critical parameters:

Logic type (Transceiver, Non-Inverting), number of elements (1), bits per element (4), output configuration (Push-Pull), output current specifications (15mA high, 24mA low), supply voltage range (4.75V ~ 5.25V), operating temperature range (0°C ~ 70°C), and package type (14-DIP through-hole). Parts meeting all these criteria are classified as direct functional equivalents. The SN74LS243N qualifies as a manufacturer-recommended substitute based on identical electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS243N is the direct functional equivalent for the discontinued SN74LS243NG4. Both parts are manufactured by Texas Instruments and maintain identical electrical characteristics, output specifications, and physical packaging. The SN74LS243N carries active product status with confirmed inventory availability (2312 pcs), ensuring procurement continuity. Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements. The primary distinction is product lifecycle status: the SN74LS243NG4 is discontinued, while the SN74LS243N remains in active production. For new designs or replacement procurement, the SN74LS243N is the appropriate selection.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS243N directly replace the SN74LS243NG4 in existing designs?

A: Yes. Both parts are electrically and mechanically identical. They share the same logic type, element configuration, output specifications, supply voltage range, operating temperature range, and 14-DIP through-hole package. No circuit modifications are required.

Q: What is the difference between SN74LS243NG4 and SN74LS243N?

A: The parts are functionally equivalent. The primary difference is product status: SN74LS243NG4 is discontinued, while SN74LS243N is active. The packaging designation differs (NG4 vs. N), but electrical performance and pinout are identical.

Q: Are there any compliance or certification differences?

A: No. Both parts maintain ROHS3 compliance and REACH unaffected status. Regulatory requirements are satisfied by either part.

Q: What is the 14-DIP package specification?

A: The 14-DIP (Dual In-line Package) measures 0.300 inches (7.62mm) in width and accommodates 14 pins in through-hole mounting configuration. Both parts use this identical package type.

Q: Is the SN74LS243N available in stock?

A: Yes. The SN74LS243N has confirmed inventory of 2312 pcs in new original condition, providing immediate procurement availability.