74LVC821AD,112 Equivalent & Substitute Parts

Part Overview

The 74LVC821AD,112 is a D-type flip-flop logic integrated circuit manufactured by NXP USA Inc., designed for 10-bit parallel data storage and transfer applications. This component features tri-state, non-inverted outputs and operates across a wide supply voltage range of 1.65V to 3.6V. The part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain functional compatibility while offering active product status and improved availability.

Substiute Parts

74LVC821AD,112

NXP USA Inc.In Stock: 91874LVC821AD,112 Datasheet

Current PartRFQ

SN74LVC821ADW

Texas InstrumentsIn Stock: 1593SN74LVC821ADW Datasheet

MFR RecommendedRFQ

SN74LVC821ADWR

Texas InstrumentsIn Stock: 1003SN74LVC821ADWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74LVC821AD,112 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

• Series: 74LVC (standard logic family)
• Type: D-Type Flip-Flop
• Number of Elements: 1
• Number of Bits per Element: 10
• Output Type: Tri-State, Non-Inverted
• Package / Case: 24-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount
• Voltage - Supply: 1.65V ~ 3.6V
• Current - Output High, Low: 24mA, 24mA
• Current - Quiescent (Iq): 10 µA
• Input Capacitance: 5 pF
• Max Propagation Delay @ V, Max CL: 7.3ns @ 3.3V, 50pF
• Trigger Type: Positive Edge
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

The substitute parts SN74LVC821ADW and SN74LVC821ADWR, both manufactured by Texas Instruments, maintain all critical electrical and mechanical parameters. Both parts are active products with improved availability compared to the obsolete NXP part. Differences in clock frequency (150 MHz vs. 200 MHz) and maximum operating temperature (-40°C ~ 85°C vs. -40°C ~ 125°C) do not affect substitution eligibility for standard applications within the specified operating ranges.

Parameter Comparison

Engineering Selection Recommendations

Both SN74LVC821ADW and SN74LVC821ADWR are direct functional equivalents to the obsolete 74LVC821AD,112. Selection between these two substitute parts depends on packaging and procurement requirements:

SN74LVC821ADW is supplied in Tube packaging, suitable for lower-volume applications and manual assembly processes.

SN74LVC821ADWR is supplied in Tape & Reel (TR) packaging, optimized for high-volume automated assembly and pick-and-place operations.

Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compliance for new designs. The active product status of both Texas Instruments parts provides long-term availability and supply chain stability compared to the obsolete NXP part. Operating temperature range differences (-40°C ~ 85°C for TI parts vs. -40°C ~ 125°C for NXP part) should be evaluated against specific application requirements; standard industrial and commercial applications typically operate within the -40°C ~ 85°C range.

Frequently Asked Questions (FAQ)

Q: Can SN74LVC821ADW and SN74LVC821ADWR be used interchangeably with 74LVC821AD,112?

A: Yes. Both Texas Instruments parts are direct functional equivalents. They maintain identical electrical characteristics, pinout, and package dimensions. The only difference is packaging format (Tube vs. Tape & Reel).

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

A: Tube packaging is used for lower-volume orders and manual assembly. Tape & Reel packaging is designed for automated pick-and-place assembly equipment and high-volume production. Both contain the same component with identical electrical specifications.

Q: Does the lower clock frequency of the Texas Instruments parts (150 MHz vs. 200 MHz) affect compatibility?

A: No. The 150 MHz clock frequency of the Texas Instruments parts is sufficient for standard 74LVC logic applications. The propagation delay specification (7.3ns @ 3.3V, 50pF) remains identical across all three parts, ensuring timing compatibility in circuit designs.

Q: Are there any temperature range limitations when substituting the Texas Instruments parts?

A: The Texas Instruments parts operate from -40°C to 85°C, compared to -40°C to 125°C for the NXP part. For applications requiring operation above 85°C, the NXP part specifications should be reviewed. Standard industrial and commercial applications operate within the -40°C to 85°C range covered by the Texas Instruments substitutes.

Q: Do the substitute parts maintain the same RoHS and REACH compliance?

A: Yes. Both SN74LVC821ADW and SN74LVC821ADWR are ROHS3 compliant and REACH unaffected, matching the compliance status of the original 74LVC821AD,112.

Q: Which substitute part should I select for my application?

A: Select SN74LVC821ADW (Tube) for prototype development, low-volume production, or manual assembly. Select SN74LVC821ADWR (Tape & Reel) for automated assembly lines and high-volume manufacturing.