SN74ALS646ADWR Equivalent & Substitute Parts

Part Overview

The SN74ALS646ADWR is a non-inverting transceiver logic integrated circuit manufactured by Texas Instruments. This device functions as a 1-element, 8-bit transceiver with 3-state output capability, designed for digital signal transmission and reception in TTL-compatible systems. The part is currently in active production status and maintains full inventory availability. Substitute parts are identified when equivalent electrical and mechanical parameters align with the original specification, ensuring functional compatibility in circuit applications.

Substiute Parts

SN74ALS646ADWR

Texas InstrumentsIn Stock: 777SN74ALS646ADWR Datasheet

Current PartRFQ

SN74ALS652ADWR

Texas InstrumentsIn Stock: 2918SN74ALS652ADWR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74ALS646ADWR are identified based on strict equivalence of the following critical parameters:

• Logic Type: Transceiver, Non-Inverting
• Number of Elements: 1
• Number of Bits per Element: 8
• Output Type: 3-State
• Current - Output High, Low: 15mA, 24mA
• Voltage - Supply: 4.5V ~ 5.5V
• Operating Temperature: 0°C ~ 70°C (TA)
• Package / Case: 24-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount

The SN74ALS652ADWR meets all specified electrical and mechanical parameters, qualifying it as a parametric equivalent substitute. Both devices share identical functional characteristics, pin configurations, and environmental operating ranges.

Parameter Comparison

Engineering Selection Recommendations

Both the SN74ALS646ADWR and SN74ALS652ADWR are active production devices from Texas Instruments with full ROHS3 compliance and identical environmental certifications. Selection between these parts is based on inventory availability and supply chain considerations. The SN74ALS652ADWR currently maintains higher inventory levels (2845 Pcs) compared to the SN74ALS646ADWR (690 Pcs), making it suitable for applications requiring extended lead time assurance. Both devices carry REACH Unaffected status and EAR99 export classification. Moisture sensitivity level 1 (Unlimited) indicates no special storage or handling requirements for either part.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS652ADWR be used as a direct replacement for the SN74ALS646ADWR?

A: Yes. Both devices are parametric equivalents with identical electrical specifications, pin configurations, and package dimensions. No circuit modifications are required for substitution.

Q: Are there any differences in the 24-SOIC package between these parts?

A: No. Both parts use the identical 24-SOIC package with 0.295" (7.50mm) width. PCB footprints and land patterns are interchangeable.

Q: Do both parts operate within the same voltage and temperature ranges?

A: Yes. Both devices operate at 4.5V to 5.5V supply voltage and 0°C to 70°C ambient temperature range. Output current specifications (15mA high, 24mA low) are identical.

Q: What is the significance of the 74ALS series designation?

A: The 74ALS designation indicates Advanced Low-power Schottky TTL logic family. Both parts conform to this standard, ensuring compatibility with existing 74ALS logic systems.

Q: Are there any compliance or certification differences?

A: No. Both parts are ROHS3 compliant, REACH Unaffected, and carry identical moisture sensitivity level 1 (Unlimited) ratings. Export classification (EAR99) is the same for both devices.