SN74LVC16646ADLRG4 Equivalent & Substitute Parts

Part Overview

The SN74LVC16646ADLRG4 is a non-inverting transceiver logic IC manufactured by Texas Instruments, featuring 2 elements with 8 bits per element and 3-state output capability in a 56-SSOP package. This part is currently discontinued at DiGi Electronics. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this transceiver architecture.

Substiute Parts

SN74LVC16646ADLRG4

Texas InstrumentsIn Stock: 907SN74LVC16646ADLRG4 Datasheet

Current PartRFQ

SN74LVC16646ADLR

Texas InstrumentsIn Stock: 799SN74LVC16646ADLR Datasheet

MFR RecommendedRFQ

SN74ALVCH16543DLR

Texas InstrumentsIn Stock: 1223SN74ALVCH16543DLR Datasheet

Parametric EquivalentRFQ

SN74LVCH16543ADLR

Texas InstrumentsIn Stock: 1056SN74LVCH16543ADLR Datasheet

Parametric EquivalentRFQ

SN74LVCH16646ADLR

Texas InstrumentsIn Stock: 3390SN74LVCH16646ADLR Datasheet

Parametric EquivalentRFQ

SN74LVCH16952ADLR

Texas InstrumentsIn Stock: 3132SN74LVCH16952ADLR Datasheet

Parametric EquivalentRFQ

74LCX16646MTDX

Fairchild SemiconductorIn Stock: 349574LCX16646MTDX Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74LVC16646ADLRG4 are classified based on strict parametric equivalence. The primary substitution criteria are:

• Logic Type: Transceiver, Non-Inverting
• Number of Elements: 2
• Number of Bits per Element: 8
• Output Type: 3-State
• Current - Output High, Low: 24mA, 24mA
• Voltage - Supply: 1.65V ~ 3.6V or 2V ~ 3.6V
• Operating Temperature: -40°C ~ 85°C (TA)
• Package / Case: 56-BSSOP or 56-TFSOP (0.240" to 0.295" width)
• Mounting Type: Surface Mount

Substitutes are grouped into two categories:

MFR Recommended Substitutes: Parts with identical base specifications and active product status from the original manufacturer (Texas Instruments).

Parametric Equivalents: Parts meeting all critical electrical and mechanical parameters, including alternative series designations (74ALVCH, 74LVCH) and alternative manufacturers (Fairchild Semiconductor).

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: SN74LVC16646ADLR is the direct MFR recommended substitute. This part maintains identical electrical specifications, package dimensions, and series designation while offering active product status and equivalent inventory availability.

Secondary Recommendations: SN74LVCH16646ADLR and SN74LVCH16952ADLR are parametric equivalents from Texas Instruments with enhanced product status and higher inventory levels (3,300 and 3,100 units respectively). These parts meet all critical electrical and mechanical parameters and carry ROHS3 compliance certification.

Alternative Manufacturer Option: 74LCX16646MTDX from Fairchild Semiconductor meets all parametric requirements with the exception of minimum supply voltage (2V vs. 1.65V). This part is suitable for applications operating at 2V or higher supply voltages and offers the highest inventory availability (3,471 units).

Compliance Consideration: All Texas Instruments substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring regulatory and environmental compatibility with the original part.

Frequently Asked Questions (FAQ)

Q: Can SN74LVC16646ADLR be used as a direct replacement for SN74LVC16646ADLRG4?

A: Yes. SN74LVC16646ADLR is the MFR recommended substitute with identical electrical specifications, output current ratings (24mA), supply voltage range (1.65V ~ 3.6V), operating temperature range (-40°C ~ 85°C), and package dimensions (56-BSSOP, 0.295" width). The primary difference is packaging format (Tape & Reel vs. Bulk) and active product status.

Q: What is the difference between the 74LVC, 74LVCH, and 74ALVCH series?

A: All three series meet the parametric requirements for this application with identical output current (24mA), supply voltage (1.65V ~ 3.6V), and operating temperature ranges. Series designation reflects internal logic family implementation but does not affect functional compatibility for this transceiver application.

Q: Is 74LCX16646MTDX compatible with designs requiring 1.65V minimum supply voltage?

A: No. The 74LCX16646MTDX has a minimum supply voltage of 2V, making it unsuitable for applications requiring operation below 2V. For designs requiring 1.65V minimum supply voltage, use SN74LVC16646ADLR, SN74ALVCH16543DLR, SN74LVCH16543ADLR, SN74LVCH16646ADLR, or SN74LVCH16952ADLR.

Q: Are there package footprint differences between substitute parts?

A: Most substitutes use the 56-BSSOP package (0.295", 7.50mm width). The 74LCX16646MTDX uses 56-TFSOP (0.240", 6.10mm width), which has a narrower body. PCB layout verification is required if switching to the 74LCX16646MTDX due to different footprint dimensions.

Q: Do all substitute parts carry the same compliance certifications?

A: All Texas Instruments substitutes are ROHS3 compliant with MSL 1 (Unlimited) rating. The 74LCX16646MTDX from Fairchild Semiconductor does not specify RoHS status in the provided data. Compliance verification with your supply chain or manufacturer is recommended for the Fairchild part.