74LCX245MSA Equivalent & Substitute Parts

Part Overview

The 74LCX245MSA is a non-inverting transceiver IC manufactured by onsemi, designed for 8-bit bidirectional data transfer with 3-state output capability. Operating at 2V to 3.6V supply voltage, this component is classified as obsolete. Due to its discontinued status, equivalent substitute parts from active manufacturers are necessary to maintain design continuity and ensure long-term component availability for new production runs and system maintenance.

Key Parameters

Parameter	Value
Manufacturer Part Number	74LCX245MSA
Manufacturer	onsemi
Series	74LCX
Logic Type	Transceiver, Non-Inverting
Number of Elements	1
Number of Bits per Element	8
Output Type	3-State
Current - Output High, Low	24mA, 24mA
Voltage - Supply	2V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74LCX245MSA is determined by the following critical parameters:

Functional Equivalence: Logic type (Transceiver, Non-Inverting), number of elements (1), and bits per element (8) must remain constant.

Electrical Compatibility: Output type (3-State), output current capability (24mA, 24mA), and supply voltage range must support the original 2V to 3.6V operating window.

Package Compatibility: The original 20-SSOP package (0.209", 5.30mm Width) defines the physical footprint. Substitutes in 20-SSOP or functionally equivalent 20-TSSOP packages are acceptable for PCB layout compatibility.

Operating Temperature: The original part operates -40°C to 85°C. Substitutes with extended temperature ranges (-40°C to 125°C) provide enhanced reliability margins.

Product Status: Active manufacturer parts are preferred over obsolete alternatives to ensure long-term supply chain stability.

Substitute parts are grouped into two categories: direct package equivalents (20-SSOP) and similar functional equivalents with alternative packages (20-TSSOP, 20-TVSOP).

Parameter Comparison

Part Number	Manufacturer	Series	Logic Type	Elements / Bits	Output Type	Current (mA)	Supply Voltage	Temp Range (°C)	Package	Status
74LCX245MSA	onsemi	74LCX	Transceiver, Non-Inverting	1 / 8	3-State	24, 24	2.0 ~ 3.6	-40 ~ 85	20-SSOP	Obsolete
SN74LVC245ADBR	Texas Instruments	74LVC	Transceiver, Non-Inverting	1 / 8	3-State	24, 24	1.65 ~ 3.6	-40 ~ 125	20-SSOP	Active
74LVC245APW,112	Nexperia USA Inc.	74LVC	Transceiver, Non-Inverting	1 / 8	3-State	24, 24	1.2 ~ 3.6	-40 ~ 125	20-TSSOP	Obsolete
74LVC245APW,118	NXP Semiconductors	74LVC	Transceiver, Non-Inverting	1 / 8	3-State	24, 24	1.2 ~ 3.6	-40 ~ 125	20-TSSOP	Active
74LVCH245APW,118	NXP Semiconductors	74LVCH	Transceiver, Non-Inverting	1 / 8	3-State	24, 24	1.2 ~ 3.6	-40 ~ 125	20-TSSOP	Active
SN74LVC245ADB	Texas Instruments	74LVC	Transceiver, Non-Inverting	1 / 8	3-State	24, 24	1.65 ~ 3.6	-40 ~ 125	20-SSOP	Active
SN74LVC245ADGVR	Texas Instruments	74LVC	Transceiver, Non-Inverting	1 / 8	3-State	24, 24	1.65 ~ 3.6	-40 ~ 125	20-TVSOP	Active
SN74LVC245AIPWREP	Texas Instruments	74LVC	Transceiver, Non-Inverting	1 / 8	3-State	24, 24	1.65 ~ 3.6	-40 ~ 85	20-TSSOP	Active
SN74LVC245APW	Texas Instruments	74LVC	Transceiver, Non-Inverting	1 / 8	3-State	24, 24	1.65 ~ 3.6	-40 ~ 125	20-TSSOP	Active
SN74LVC245APWR	Texas Instruments	74LVC	Transceiver, Non-Inverting	1 / 8	3-State	24, 24	1.65 ~ 3.6	-40 ~ 125	20-TSSOP	Active
SN74LVC245APWT	Texas Instruments	74LVC	Transceiver, Non-Inverting	1 / 8	3-State	24, 24	1.65 ~ 3.6	-40 ~ 125	20-TSSOP	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Package Replacement:

SN74LVC245ADBR (Texas Instruments) is the preferred direct substitute. It maintains the 20-SSOP package footprint, ensuring drop-in compatibility without PCB redesign. The part is active in production, ROHS3 compliant, and offers extended operating temperature range (-40°C to 125°C) compared to the original specification. Supply voltage range (1.65V to 3.6V) encompasses the original 2V to 3.6V window.

Alternative - Same Package, Active Status:

SN74LVC245ADB (Texas Instruments) provides identical functional and package specifications to SN74LVC245ADBR with active product status and ROHS3 compliance.

Package-Alternative Options:

For designs where package migration is acceptable, 20-TSSOP alternatives offer superior availability and active manufacturer support:

74LVC245APW,118 (NXP Semiconductors): Active status, highest inventory availability (190,454 pcs), extended temperature range, ROHS3 compliant.
74LVCH245APW,118 (NXP Semiconductors): Active status, largest inventory (257,577 pcs), 74LVCH series variant, ROHS3 compliant.
SN74LVC245APWR (Texas Instruments): Active status, high inventory (45,300 pcs), ROHS3 compliant, Cut Tape & Digi-Reel packaging.

Temperature-Matched Alternative:

SN74LVC245AIPWREP (Texas Instruments) matches the original -40°C to 85°C operating temperature range while providing active product status and ROHS3 compliance in 20-TSSOP package.

All recommended substitutes maintain functional equivalence (1 element, 8 bits, 3-state output, 24mA drive capability) and are REACH unaffected with EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can SN74LVC245ADBR directly replace 74LCX245MSA without PCB modification?

A: Yes. Both parts use the 20-SSOP package with identical 0.209" width and 5.30mm dimensions. Pin configuration and functional behavior are equivalent for non-inverting transceiver operation. No PCB layout changes are required.

Q: What is the difference between 20-SSOP and 20-TSSOP packages?

A: 20-SSOP (Shrink Small Outline Package) has 0.209" width and 5.30mm body width. 20-TSSOP (Thin Shrink Small Outline Package) has 0.173" width and 4.40mm body width. TSSOP is physically smaller. Substitution requires PCB footprint verification and potential layout redesign.

Q: Why does SN74LVC245ADBR have a lower minimum supply voltage (1.65V vs 2V)?

A: The 74LVC series is designed with enhanced low-voltage operation capability. The 1.65V minimum does not affect compatibility with designs operating at 2V or higher. The part functions correctly across the entire original 2V to 3.6V range.

Q: Are all recommended substitutes RoHS3 compliant?

A: Yes. All active Texas Instruments and NXP Semiconductors parts listed are ROHS3 compliant. The original 74LCX245MSA does not specify RoHS status due to its obsolete classification.

Q: Which substitute offers the best long-term availability?

A: 74LVC245APW,118 (NXP Semiconductors) and 74LVCH245APW,118 (NXP Semiconductors) show the highest current inventory levels (190,454 and 257,577 pcs respectively) with active product status, indicating strong supply chain support.

Q: Can I use 20-TVSOP package variant SN74LVC245ADGVR as a substitute?

A: SN74LVC245ADGVR is functionally equivalent but uses 20-TVSOP package (0.173", 4.40mm width). This requires PCB footprint redesign. Use only if package migration is acceptable in your design cycle.

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

A: Both are non-inverting transceiver variants with identical functional specifications for this application. 74LVCH represents an enhanced variant with equivalent electrical performance. Selection between them depends on manufacturer preference and supply availability.

Q: Do all substitutes maintain 24mA output drive capability?

A: Yes. All listed substitutes specify 24mA output high and low current, matching the original 74LCX245MSA specification.

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