74LVC821APW,112 Equivalent & Substitute Parts

Part Overview

The 74LVC821APW,112 is a D-type flip-flop logic integrated circuit manufactured by NXP USA Inc., featuring 1 element with 10-bit configuration and positive edge triggering. This component operates across a supply voltage range of 1.65V to 3.6V with tri-state, non-inverted outputs. The part is classified as obsolete, making equivalent substitutes from active manufacturers necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	74LVC821APW,112
Manufacturer	NXP USA Inc.
Base Product Number	74LVC821
Category	Logic
Type	D-Type Flip Flop
Number of Elements	1
Number of Bits per Element	10
Output Type	Tri-State, Non-Inverted
Trigger Type	Positive Edge
Clock Frequency	200 MHz
Max Propagation Delay @ 3.3V, 50pF	7.3 ns
Voltage - Supply	1.65V ~ 3.6V
Current - Output High, Low	24 mA, 24 mA
Current - Quiescent (Iq)	10 µA
Input Capacitance	5 pF
Operating Temperature	-40°C ~ 125°C
Package / Case	24-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74LVC821APW,112 is determined by the following critical parameters:

Base product number (74LVC821) ensures functional equivalence
D-type flip-flop configuration with 1 element and 10-bit structure
Tri-state, non-inverted output type
Positive edge trigger mechanism
Supply voltage range 1.65V ~ 3.6V
Propagation delay specification of 7.3 ns @ 3.3V, 50pF
Output current capability of 24 mA (high and low)
Surface mount technology with ROHS3 compliance

The substitute parts listed below maintain these core electrical parameters. Variations in packaging format (TSSOP vs. SSOP) and packaging method (Tube vs. Tape & Reel) are permitted substitutions when mechanical constraints allow. Operating temperature range differences are noted but do not prevent substitution when application requirements are met.

Parameter Comparison

Parameter	74LVC821APW,112 (NXP)	SN74LVC821ADBR (TI)	SN74LVC821APW (TI)	SN74LVC821APWR (TI)	SN74LVC821APWT (TI)
Manufacturer	NXP USA Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Base Product Number	74LVC821	74LVC821	74LVC821	74LVC821	74LVC821
Type	D-Type	D-Type	D-Type	D-Type	D-Type
Number of Elements	1	1	1	1	1
Number of Bits per Element	10	10	10	10	10
Output Type	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Clock Frequency	200 MHz	150 MHz	150 MHz	150 MHz	150 MHz
Max Propagation Delay @ 3.3V, 50pF	7.3 ns	7.3 ns	7.3 ns	7.3 ns	7.3 ns
Voltage - Supply	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V
Current - Output High, Low	24 mA, 24 mA	24 mA, 24 mA	24 mA, 24 mA	24 mA, 24 mA	24 mA, 24 mA
Current - Quiescent (Iq)	10 µA	10 µA	10 µA	10 µA	10 µA
Input Capacitance	5 pF	5 pF	5 pF	5 pF	5 pF
Operating Temperature	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	24-TSSOP (0.173", 4.40mm)	24-SSOP (0.209", 5.30mm)	24-TSSOP (0.173", 4.40mm)	24-TSSOP (0.173", 4.40mm)	24-TSSOP (0.173", 4.40mm)
Packaging Method	Not specified	Tape & Reel (TR)	Tube	Tape & Reel (TR)	Tape & Reel (TR)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All Texas Instruments substitute parts (SN74LVC821ADBR, SN74LVC821APW, SN74LVC821APWR, SN74LVC821APWT) are active products with ROHS3 compliance and MSL Level 1 rating, making them suitable replacements for the obsolete NXP part.

SN74LVC821APW and SN74LVC821APWR are preferred for applications requiring the identical 24-TSSOP package footprint. SN74LVC821APW is supplied in Tube packaging, while SN74LVC821APWR is supplied in Tape & Reel format. Both maintain the same physical dimensions (0.173", 4.40mm width) as the original part.

SN74LVC821APWT is functionally equivalent with identical packaging specifications and is supplied in Tape & Reel format.

SN74LVC821ADBR uses a 24-SSOP package (0.209", 5.30mm width) instead of TSSOP. This substitution is valid only when PCB layout accommodates the wider package footprint.

All substitutes operate within the specified supply voltage range (1.65V ~ 3.6V) and maintain the required propagation delay of 7.3 ns @ 3.3V, 50pF. The reduced clock frequency specification (150 MHz vs. 200 MHz) on Texas Instruments parts does not impact substitution for applications operating at or below 150 MHz.

Frequently Asked Questions (FAQ)

Q: Can SN74LVC821ADBR replace the 74LVC821APW,112 directly on the PCB?

A: SN74LVC821ADBR uses a 24-SSOP package (0.209", 5.30mm width) compared to the original 24-TSSOP package (0.173", 4.40mm width). Direct PCB replacement is not possible without layout modification. Verify PCB footprint compatibility before selection.

Q: What is the difference between SN74LVC821APW and SN74LVC821APWR?

A: Both parts are electrically identical with the same 24-TSSOP package. The difference is packaging method: SN74LVC821APW is supplied in Tube format, while SN74LVC821APWR is supplied in Tape & Reel (TR) format. Select based on assembly process requirements.

Q: Are the Texas Instruments parts suitable for high-temperature applications?

A: Texas Instruments substitutes operate from -40°C to 85°C, compared to the original part's -40°C to 125°C range. For applications requiring operation above 85°C, the original specification cannot be met with these substitutes.

Q: Do all substitute parts meet RoHS compliance?

A: Yes, all listed substitute parts are ROHS3 compliant with MSL Level 1 (Unlimited) rating, matching the original part's environmental specifications.

Q: What is the significance of the 200 MHz vs. 150 MHz clock frequency difference?

A: The original part specifies 200 MHz maximum clock frequency, while Texas Instruments substitutes specify 150 MHz. For applications operating at or below 150 MHz, this difference is not limiting. Applications requiring operation above 150 MHz cannot use these substitutes.

Q: Are all substitute parts pin-compatible with the original?

A: Yes, all substitute parts maintain the same functional pin configuration as the 74LVC821 base product number. Electrical and logical compatibility is ensured across all listed substitutes.

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