SN74S38D NAND Gate IC Equivalent & Substitute Parts

Part Overview

The SN74S38D is a 4-channel 2-input NAND gate IC with open collector output, manufactured by Texas Instruments in 14-SOIC surface mount packaging. This component is classified as Last Time Buy, indicating discontinued production with limited inventory availability. Identifying qualified substitute parts ensures design continuity and supply chain reliability for applications requiring this logic function.

Substiute Parts

SN74S38D

Texas InstrumentsIn Stock: 1420SN74S38D Datasheet

Current PartRFQ

SN74S38DR

Texas InstrumentsIn Stock: 2085SN74S38DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74S38D is determined by strict equivalence across the following critical parameters:

• Logic function: 4-channel 2-input NAND gate with open collector output
• Electrical specifications: 4.75V ~ 5.25V supply voltage, 60mA output current, 9ns propagation delay at 5V with 150pF load
• Input logic thresholds: 0.8V low, 2V high
• Package format: 14-SOIC surface mount
• Compliance: ROHS3 compliant, MSL 1 rating

The SN74S38DR qualifies as a direct substitute based on identical electrical characteristics, logic configuration, and package specifications. The primary distinction is product status and packaging format availability.

Parameter Comparison

Engineering Selection Recommendations

The SN74S38DR is the qualified substitute for the SN74S38D. Both components meet ROHS3 compliance and carry identical electrical and functional specifications. The SN74S38DR is preferred for new designs and ongoing production due to its Active product status, ensuring long-term availability and supply chain stability. The SN74S38D, classified as Last Time Buy, should be reserved for legacy system maintenance where existing inventory is available.

Frequently Asked Questions (FAQ)

Q: Can the SN74S38DR directly replace the SN74S38D in existing designs?

A: Yes. The SN74S38DR is electrically and functionally identical to the SN74S38D. Both components feature the same 4-channel 2-input NAND gate configuration with open collector output, identical supply voltage range (4.75V ~ 5.25V), output current rating (60mA), propagation delay (9ns @ 5V, 150pF), and 14-SOIC package format. No circuit modifications are required.

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

A: Tube packaging (SN74S38D) is used for lower-volume applications and manual assembly processes. Cut Tape and Digi-Reel® packaging (SN74S38DR) is optimized for automated pick-and-place assembly and higher-volume production. Both formats contain identical components; the difference is in handling and dispensing method.

Q: Why is the SN74S38D classified as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this part number. Existing inventory is available for purchase, but no future production runs are planned. The SN74S38DR remains in active production and is the recommended choice for new designs.

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

A: No. Both the SN74S38D and SN74S38DR carry identical ROHS3 compliance, Moisture Sensitivity Level 1 (Unlimited), REACH Unaffected status, and the same ECCN and HTSUS classifications.

Q: What is the operating temperature range for these components?

A: Both components operate across 0°C to 70°C. This range must be verified against your application's thermal requirements.