SN74LS32N-NG Equivalent & Substitute Parts

Part Overview

The SN74LS32N-NG is a 4-channel 2-input OR Gate IC manufactured by Texas Instruments in 14-PDIP through-hole packaging. This logic gate performs OR operations across four independent channels, each accepting two digital inputs. The device operates within the 4.75V to 5.25V supply voltage range and is classified as obsolete product status. Due to its obsolete classification and limited modern availability in through-hole form factors, identifying functionally equivalent substitute parts is necessary for ongoing system maintenance, legacy system repairs, and new designs requiring compatible logic gate functionality.

Substiute Parts

SN74LS32N-NG

Texas InstrumentsIn Stock: 1073SN74LS32N-NG Datasheet

Current PartRFQ

SN74AC32PWR

Texas InstrumentsIn Stock: 3572SN74AC32PWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS32N-NG is determined by the following core parameters:

Functional Equivalence Requirements:

• Logic Type: OR Gate (identical function)
• Number of Circuits: 4 channels (identical configuration)
• Number of Inputs: 2 inputs per channel (identical configuration)

Electrical Compatibility Parameters:

• Supply Voltage Range: Must encompass or be compatible with 4.75V ~ 5.25V operation
• Input Logic Levels: Must accept standard TTL/CMOS logic levels
• Output Drive Capability: Must provide sufficient current for downstream logic circuits

Physical Considerations:

• Mounting Type: Through-hole preferred for direct replacement; surface-mount alternatives require adapter solutions
• Package Type: 14-pin configuration (DIP or equivalent pin count)

The SN74AC32PWR qualifies as a functional substitute based on identical logic gate configuration (4-channel 2-input OR gate), compatible supply voltage range (2V ~ 6V encompasses the 5V operating point), and equivalent pin functionality. The primary difference is packaging format (surface-mount TSSOP versus through-hole DIP) and enhanced electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

For Direct Through-Hole Replacement: The SN74LS32N-NG is classified as obsolete. When direct replacement in through-hole form factor is required, alternative 74LS-series or 74HC-series OR gate ICs in 14-DIP packaging should be evaluated. The SN74AC32PWR provides functional equivalence but requires surface-mount implementation or adapter circuitry.

For New Designs or System Upgrades: The SN74AC32PWR is recommended as the primary substitute. It maintains active product status from Texas Instruments, provides superior electrical performance (lower quiescent current, faster propagation delay, higher output drive capability), and operates across an extended temperature range (-40°C ~ 85°C). Both devices are ROHS3 compliant, ensuring environmental regulation compliance.

Voltage Compatibility: The SN74AC32PWR supply voltage range (2V ~ 6V) encompasses the SN74LS32N-NG operating point (4.75V ~ 5.25V). At 5V nominal operation, both devices function within specified parameters.

Packaging Consideration: Substitution from 14-DIP through-hole to 14-TSSOP surface-mount requires PCB redesign or use of DIP-to-TSSOP adapter modules. For legacy system repairs requiring identical form factor, alternative through-hole logic gate ICs should be sourced.

Frequently Asked Questions (FAQ)

Q: Can the SN74AC32PWR directly replace the SN74LS32N-NG in an existing PCB?

A: Functional replacement is possible only with adapter circuitry. The SN74AC32PWR uses 14-TSSOP surface-mount packaging, while the SN74LS32N-NG uses 14-DIP through-hole packaging. Pin-to-pin functionality is equivalent, but physical mounting differs. DIP-to-TSSOP adapter modules enable direct substitution on existing through-hole PCBs.

Q: What are the key electrical differences between these parts?

A: The SN74AC32PWR offers superior performance: quiescent current reduced from 9.8 mA to 2 µA, propagation delay reduced from 22ns to 7.5ns, and output drive capability increased from 400µA/8mA to 24mA/24mA. Supply voltage range is expanded from 4.75V-5.25V to 2V-6V, and operating temperature range extends from 0°C-70°C to -40°C-85°C.

Q: Are both devices RoHS compliant?

A: Yes. Both the SN74LS32N-NG and SN74AC32PWR are ROHS3 compliant, meeting environmental and hazardous substance restrictions.

Q: Why is the SN74LS32N-NG classified as obsolete?

A: The SN74LS32N-NG represents legacy TTL logic technology. Texas Instruments has transitioned manufacturing focus to advanced CMOS logic families (such as 74AC and 74HC series) that offer superior power efficiency, performance, and integration density. The SN74AC32PWR represents the modern equivalent in the active product portfolio.

Q: Can I use the SN74AC32PWR in a 5V-only system?

A: Yes. The SN74AC32PWR operates within the 2V ~ 6V supply range, which includes 5V nominal operation. At 5V, the device functions within all specified electrical parameters and is fully compatible with standard 5V logic systems.

Q: What is the pin configuration compatibility?

A: Both devices use 14-pin configurations with identical pin assignments for the OR gate function. Pin 7 is ground, pin 14 is supply voltage, and pins 1-6, 8-13 carry input and output signals in identical arrangement. Functional pin compatibility is complete; only physical packaging differs.