SN74LS33NG4 Equivalent & Substitute Parts

Part Overview

The SN74LS33NG4 is a NOR Gate IC featuring 4 channels with 2 inputs per channel, configured in an open collector output topology. This component is packaged in a 14-PDIP (0.300", 7.62mm) through-hole format and operates within the 4.75V to 5.25V supply voltage range. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing design support and procurement.

Substiute Parts

SN74LS33NG4

Texas InstrumentsIn Stock: 1185SN74LS33NG4 Datasheet

Current PartRFQ

SN74LS33N

Texas InstrumentsIn Stock: 2372SN74LS33N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS33NG4 is determined by strict equivalence across the following critical parameters:

• Logic Type: NOR Gate (4 channels, 2 inputs per channel)
• Output Configuration: Open Collector topology
• Electrical Specifications: Supply voltage 4.75V ~ 5.25V, output current 24mA, propagation delay 32ns @ 5V with 45pF load
• Input Logic Levels: Low 0.8V, High 2V
• Operating Temperature Range: 0°C ~ 70°C
• Package Format: 14-DIP through-hole mounting
• Series Classification: 74LS logic family

The SN74LS33N qualifies as a direct substitute based on identical electrical performance, logic configuration, and package specifications. Packaging format (tube vs. other configurations) does not affect functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS33N is the direct manufacturer-recommended substitute for the discontinued SN74LS33NG4. Both parts are manufactured by Texas Instruments and maintain identical electrical and functional specifications across all critical parameters. The SN74LS33N carries active product status with confirmed inventory availability (2350 pcs), ensuring procurement continuity. Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for equivalent component selection. The substitution requires no circuit modifications or design changes.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS33N be used as a direct replacement for the SN74LS33NG4 without circuit modifications?

A: Yes. The SN74LS33N is electrically and functionally identical to the SN74LS33NG4 across all specified parameters, including logic configuration, supply voltage, output current, propagation delay, and operating temperature range. No circuit design changes are required.

Q: What is the difference between the SN74LS33NG4 and SN74LS33N?

A: The primary difference is product status and packaging format. The SN74LS33NG4 is discontinued, while the SN74LS33N is active with available inventory. Both parts share identical electrical specifications and 14-DIP package dimensions.

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

A: No. Both the SN74LS33NG4 and SN74LS33N maintain ROHS3 compliance, REACH unaffected status, and identical moisture sensitivity levels, ensuring equivalent regulatory compliance.

Q: Does the packaging format (tube vs. other configurations) affect functional compatibility?

A: No. Packaging format affects only procurement and handling procedures. The electrical and functional performance of the SN74LS33N remains identical regardless of packaging configuration.

Q: What are the key parameters that determine substitution eligibility for the SN74LS33NG4?

A: Substitution eligibility is determined by: 4-channel NOR gate configuration with 2 inputs per channel, open collector output topology, 4.75V to 5.25V supply voltage, 24mA output current, 32ns propagation delay at 5V with 45pF load, 0.8V low and 2V high input logic levels, 0°C to 70°C operating temperature range, and 14-DIP through-hole package format.