SN74LVC861APWT Equivalent & Substitute Parts

Part Overview

The SN74LVC861APWT is a non-inverting transceiver logic integrated circuit manufactured by Texas Instruments, classified within the 74LVC series. This device functions as a 1-element, 10-bit transceiver with 3-state output capability, housed in a 24-TSSOP surface mount package. The part is currently listed as obsolete, necessitating identification of functionally compatible alternatives from the active product portfolio to ensure design continuity and supply chain reliability.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Series	74LVC
Logic Type	Transceiver, Non-Inverting
Number of Elements	1
Number of Bits per Element	10
Output Type	3-State
Current - Output High, Low	24mA, 24mA
Voltage - Supply	1.65V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	24-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution of the SN74LVC861APWT is determined by strict adherence to the following critical parameters:

Primary Compatibility Criteria:

Logic Type: Transceiver, Non-Inverting
Output Type: 3-State
Package / Case: 24-TSSOP (0.173", 4.40mm Width)
Voltage - Supply: 1.65V ~ 3.6V
Current - Output High, Low: 24mA, 24mA
Operating Temperature: -40°C ~ 85°C (TA)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Secondary Consideration:

Number of Bits per Element: The SN74LVC861APWT operates with 10 bits per element. Substitute parts with 8 or 9 bits per element are functionally compatible when circuit design accommodates reduced bit width. Parts with 10-bit configuration provide direct pin-for-pin compatibility.

All identified substitute parts maintain identical electrical characteristics, package dimensions, and environmental compliance specifications. Substitution is valid across all listed alternatives provided the application circuit design accommodates the specified bit-width configuration.

Parameter Comparison

Part Number	Bits per Element	Product Status	Packaging	Inventory (Pcs)	Voltage Supply	Output Current	Operating Temp
SN74LVC861APWT	10	Obsolete	Tube	1162	1.65V ~ 3.6V	24mA, 24mA	-40°C ~ 85°C
SN74LVC861APWR	10	Active	Tape & Reel (TR)	1964	1.65V ~ 3.6V	24mA, 24mA	-40°C ~ 85°C
SN74LVC863APWR	9	Active	Tape & Reel (TR)	1141	1.65V ~ 3.6V	24mA, 24mA	-40°C ~ 85°C
SN74LVC2952APWR	8	Active	Tape & Reel (TR)	699	1.65V ~ 3.6V	24mA, 24mA	-40°C ~ 85°C
SN74LVC2952APWT	8	Discontinued at DiGi Electronics	Tube	786	1.65V ~ 3.6V	24mA, 24mA	-40°C ~ 85°C
SN74LVC543APWR	8	Active	Tape & Reel (TR)	4080	1.65V ~ 3.6V	24mA, 24mA	-40°C ~ 85°C
SN74LVC543APWT	8	Active	Tape & Reel (TR)	1459	1.65V ~ 3.6V	24mA, 24mA	-40°C ~ 85°C
SN74LVC646APWR	8	Active	Tape & Reel (TR)	773	1.65V ~ 3.6V	24mA, 24mA	-40°C ~ 85°C
SN74LVC646APWT	8	Discontinued at DiGi Electronics	Tube	883	1.65V ~ 3.6V	24mA, 24mA	-40°C ~ 85°C
SN74LVC652APWR	8	Active	Tape & Reel (TR)	3400	1.65V ~ 3.6V	24mA, 24mA	-40°C ~ 85°C
SN74LVC652APWT	8	Active	Tape & Reel (TR)	1776	1.65V ~ 3.6V	24mA, 24mA	-40°C ~ 85°C

Engineering Selection Recommendations

Direct Pin-Compatible Replacement (10-Bit Configuration): SN74LVC861APWR is the primary substitute for SN74LVC861APWT. Both devices maintain identical 10-bit per element architecture and electrical specifications. The SN74LVC861APWR is currently in active production status with Tape & Reel packaging, ensuring long-term supply availability. This substitution requires no circuit modification.

Alternative Substitutes (8-Bit and 9-Bit Configurations): For applications where reduced bit-width is acceptable, the following active parts provide functional equivalence:

SN74LVC863APWR (9-bit configuration, active status)
SN74LVC543APWR (8-bit configuration, active status, highest inventory: 4080 pcs)
SN74LVC652APWR (8-bit configuration, active status, high inventory: 3400 pcs)
SN74LVC646APWR (8-bit configuration, active status)
SN74LVC2952APWR (8-bit configuration, active status)

All substitute parts comply with ROHS3 and REACH requirements, maintaining environmental and regulatory compliance equivalent to the original part. Selection among 8-bit alternatives should prioritize parts with active product status and highest inventory availability for supply chain resilience.

Frequently Asked Questions (FAQ)

Q: Can SN74LVC861APWR directly replace SN74LVC861APWT without circuit modification? A: Yes. Both parts are identical in electrical specifications, bit-width configuration (10 bits), and 24-TSSOP package dimensions. The only difference is packaging format: APWT is tube packaging, APWR is Tape & Reel. No circuit changes are required.

Q: What is the difference between 8-bit, 9-bit, and 10-bit substitute options? A: The bit-width determines the number of data lines the transceiver handles per element. SN74LVC861APWT operates with 10 bits per element. SN74LVC863APWR provides 9 bits, and SN74LVC2952APWR, SN74LVC543APWR, SN74LVC646APWR, and SN74LVC652APWR provide 8 bits. Substitution with reduced bit-width requires circuit design accommodation for the lower data channel count.

Q: Are all substitute parts RoHS and REACH compliant? A: Yes. All listed substitute parts maintain ROHS3 Compliant and REACH Unaffected status, matching the environmental compliance of the original SN74LVC861APWT.

Q: What is the difference between APWT and APWR packaging designations? A: APWT indicates tube packaging (individual component packaging), while APWR indicates Tape & Reel (TR) packaging for automated assembly. Both contain identical die and electrical specifications. Selection depends on assembly process requirements and volume needs.

Q: Which substitute part offers the best supply availability? A: SN74LVC543APWR currently maintains the highest inventory at 4080 pieces with active product status. SN74LVC652APWR provides the second-highest inventory at 3400 pieces. Both are 8-bit alternatives suitable for applications accommodating reduced bit-width.

Q: Are there any electrical performance differences between the substitute parts? A: No. All substitute parts maintain identical supply voltage range (1.65V ~ 3.6V), output current specifications (24mA high and low), and operating temperature range (-40°C ~ 85°C). Differences exist only in bit-width configuration and product lifecycle status.

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