SN74ALS38BD NAND Gate IC Equivalent & Substitute Parts

Part Overview

The SN74ALS38BD is a 4-channel 2-input NAND gate IC manufactured by Texas Instruments in a 14-SOIC surface mount package. This logic component features open collector outputs and operates within the 4.5V to 5.5V supply voltage range. The SN74ALS38BD is classified as Last Time Buy, indicating end-of-life status. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications currently utilizing this component.

Substiute Parts

SN74ALS38BD

Texas InstrumentsIn Stock: 1533SN74ALS38BD Datasheet

Current PartRFQ

SN74ALS38BDR

Texas InstrumentsIn Stock: 4145SN74ALS38BDR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74ALS38BD is determined by strict equivalence across the following critical parameters:

• Logic function: 4-channel 2-input NAND gate with open collector output
• Electrical specifications: 4.5V ~ 5.5V supply voltage, 24mA output current, 33ns propagation delay at 5V with 50pF load
• Input logic thresholds: 0.8V low level, 2V high level
• Package format: 14-SOIC surface mount configuration
• Operating temperature range: 0°C ~ 70°C
• Compliance standards: ROHS3 compliant, MSL Level 1

Parts meeting all these parameters are classified as direct substitutes. Variations in any of these specifications disqualify a part from substitution eligibility.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS38BDR is a direct functional and electrical equivalent to the SN74ALS38BD. Both parts are manufactured by Texas Instruments and share identical electrical specifications, package format, and compliance certifications. The primary distinction is product status: the SN74ALS38BD is designated Last Time Buy, while the SN74ALS38BDR maintains Active status with higher inventory availability (4082 pcs vs. 1521 pcs). For new designs or applications requiring long-term supply assurance, the SN74ALS38BDR is the appropriate selection. Both parts satisfy ROHS3 compliance and MSL Level 1 requirements.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS38BDR replace the SN74ALS38BD in existing designs?

A: Yes. The SN74ALS38BDR is electrically and functionally identical to the SN74ALS38BD across all specified parameters, including logic function, voltage ratings, output current, propagation delay, and package format. Direct substitution is valid without circuit modification.

Q: What is the difference between SN74ALS38BD and SN74ALS38BDR?

A: The parts are electrically equivalent. The suffix designation indicates different packaging or distribution channels. The SN74ALS38BDR is in Active product status with greater inventory availability, while the SN74ALS38BD is Last Time Buy.

Q: Are both parts RoHS compliant?

A: Yes. Both the SN74ALS38BD and SN74ALS38BDR are ROHS3 compliant and carry MSL Level 1 rating, indicating unlimited moisture sensitivity protection.

Q: What is the 14-SOIC package specification?

A: The 14-SOIC package is a surface mount configuration measuring 0.154 inches (3.90mm) in width. This package format is identical for both the main part and substitute, ensuring PCB layout compatibility.

Q: Why is the SN74ALS38BD marked as Last Time Buy?

A: Last Time Buy designation indicates the manufacturer is discontinuing production. Existing inventory is available for final orders, but long-term supply cannot be guaranteed. The SN74ALS38BDR, with Active status, is recommended for designs requiring extended component availability.