SN74LS378D Equivalent & Substitute Parts

Part Overview

The SN74LS378D is a 6-bit D-type flip-flop logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This component functions as a standard positive edge-triggered flip-flop with non-inverted outputs, operating at a maximum clock frequency of 40 MHz. The part is currently in Last Time Buy status, indicating discontinued production with limited inventory availability. Identifying equivalent substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring this specific logic function.

Substiute Parts

SN74LS378D

Texas InstrumentsIn Stock: 1334SN74LS378D Datasheet

Current PartRFQ

SN74LS378DR

Texas InstrumentsIn Stock: 723SN74LS378DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74LS378D is determined by strict equivalence across the following critical parameters:

• Logic Function: D-Type flip-flop with 1 element and 6 bits per element
• Electrical Performance: 40 MHz clock frequency, 27 ns maximum propagation delay at 5V with 15pF load
• Trigger Characteristics: Positive edge-triggered operation with non-inverted outputs
• Power Supply: 4.75V to 5.25V operating range
• Quiescent Current: 22 mA maximum
• Operating Temperature Range: 0°C to 70°C
• Package Specification: 16-SOIC (0.154", 3.90mm Width) surface mount
• Compliance: ROHS3 compliant with MSL Level 1

The SN74LS378DR qualifies as a manufacturer-recommended substitute based on identical electrical specifications and package configuration. The primary distinction is packaging format: the SN74LS378D is supplied in Tube packaging, while the SN74LS378DR is supplied in Tape & Reel (TR) format.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS378DR is the manufacturer-recommended substitute for the SN74LS378D. Both parts are manufactured by Texas Instruments and maintain identical electrical and functional specifications. The SN74LS378D is in Last Time Buy status with limited inventory (1,269 pcs), while the SN74LS378DR maintains Active product status with current availability (641 pcs).

Selection between these parts should be based on packaging requirements and supply chain strategy. The SN74LS378D in Tube packaging is suitable for lower-volume applications or manual assembly processes. The SN74LS378DR in Tape & Reel format is optimized for automated pick-and-place assembly and high-volume production environments.

Both parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard manufacturing processes and long-term storage without moisture sensitivity concerns.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS378DR be used as a direct replacement for the SN74LS378D?

A: Yes. The SN74LS378DR is electrically and functionally identical to the SN74LS378D. Both parts feature the same 6-bit D-type flip-flop configuration, 40 MHz clock frequency, 27 ns propagation delay, and 16-SOIC package dimensions. The only difference is the packaging format: Tube versus Tape & Reel.

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

A: Tube packaging supplies individual components in a plastic tube, typically used for manual assembly or lower-volume applications. Tape & Reel packaging places components on a continuous carrier tape wound on a reel, designed for automated assembly equipment. Both formats contain the same component with identical specifications.

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

A: No. Both the SN74LS378D and SN74LS378DR maintain identical ROHS3 compliance and MSL Level 1 ratings. They are suitable for the same manufacturing processes and environmental conditions.

Q: Why is the SN74LS378D in Last Time Buy status?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this part number. The SN74LS378DR, which is functionally equivalent, remains in Active production status and is the recommended long-term supply source.

Q: What are the critical parameters for substitution compatibility?

A: Substitution compatibility is determined by matching the following parameters: D-Type flip-flop function with 6 bits per element, 40 MHz clock frequency, 27 ns maximum propagation delay, positive edge trigger, non-inverted outputs, 4.75V to 5.25V supply voltage, 22 mA quiescent current, 0°C to 70°C operating temperature range, and 16-SOIC package configuration.