IDT74LVC245ASOG Equivalent & Substitute Parts

Part Overview

The IDT74LVC245ASOG is a non-inverting transceiver logic IC manufactured by Renesas Electronics Corporation, designed for 8-bit bidirectional data transfer with 3-state output capability. This component operates across a supply voltage range of 2.7V to 3.6V and is housed in a 20-SOIC package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	IDT74LVC245ASOG
Manufacturer	Renesas Electronics Corporation
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	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the IDT74LVC245ASOG is determined by the following critical parameters:

Core Functional Requirements:

Logic type: Transceiver, Non-Inverting
Number of elements: 1
Bits per element: 8
Output type: 3-State
Package type: 20-SOIC (0.295", 7.50mm Width)

Electrical Compatibility Criteria:

Supply voltage range must encompass or exceed 2.7V to 3.6V
Output current capability: minimum 24mA for both high and low states
Operating temperature range: minimum -40°C to 85°C

Compliance Considerations:

RoHS3 compliance preferred for new designs
Moisture sensitivity level and REACH status alignment

Substitute parts are grouped into three categories based on manufacturer and series designation: Nexperia 74LVC/74LVC2245/74LVCH series, onsemi 74LCX series, and Texas Instruments 74LVC/74LVCH series. All listed substitutes meet or exceed the core functional and electrical requirements of the original part.

Parameter Comparison

Part Number	Manufacturer	Series	Output Current (mA)	Supply Voltage (V)	Temp Range (°C)	Package	Product Status	RoHS Status
IDT74LVC245ASOG	Renesas	74LVC	24, 24	2.7 ~ 3.6	-40 ~ 85	20-SOIC	Obsolete	Non-compliant
74LVC245AD,118	Nexperia	74LVC	24, 24	1.2 ~ 3.6	-40 ~ 125	20-SO	Active	ROHS3
74LVC2245AD,118	Nexperia	74LVC	12, 12	1.2 ~ 3.6	-40 ~ 125	20-SO	Active	ROHS3
74LVCH245AD,118	Nexperia	74LVCH	24, 24	1.2 ~ 3.6	-40 ~ 125	20-SO	Active	ROHS3
MC74LCX245DWG	onsemi	74LCX	24, 24	2.0 ~ 5.5	-55 ~ 125	20-SOIC	Active	ROHS3
MC74LCX245DWR2G	onsemi	74LCX	24, 24	2.0 ~ 5.5	-55 ~ 125	20-SOIC	Active	ROHS3
SN74LVC245ADW	Texas Instruments	74LVC	24, 24	1.65 ~ 3.6	-40 ~ 125	20-SOIC	Active	ROHS3
SN74LVC245ADWR	Texas Instruments	74LVC	24, 24	1.65 ~ 3.6	-40 ~ 125	20-SOIC	Active	ROHS3
SN74LVC245ANS	Texas Instruments	74LVC	24, 24	1.65 ~ 3.6	-40 ~ 125	20-SO	Active	ROHS3
SN74LVC245ANSR	Texas Instruments	74LVC	24, 24	1.65 ~ 3.6	-40 ~ 125	20-SO	Active	ROHS3
SN74LVCH245ADW	Texas Instruments	74LVCH	24, 24	1.65 ~ 3.6	-40 ~ 125	20-SOIC	Active	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

SN74LVC245ADWR (Texas Instruments) and SN74LVC245ADW (Texas Instruments) are the preferred direct replacements. Both maintain the 24mA output current specification, operate within the original 2.7V to 3.6V range with extended lower limit to 1.65V, and are housed in the identical 20-SOIC package. Both parts are active products with ROHS3 compliance and unlimited moisture sensitivity rating.

Alternative Substitutes (Functional Equivalence with Considerations):

74LVC245AD,118 (Nexperia) provides functional equivalence with active product status and ROHS3 compliance. The supply voltage range extends to 1.2V minimum, and operating temperature extends to 125°C. Package designation is 20-SO, which is mechanically compatible with 20-SOIC footprints.

MC74LCX245DWG and MC74LCX245DWR2G (onsemi) offer extended supply voltage range (2.0V to 5.5V) and wider operating temperature (-55°C to 125°C). These parts maintain 24mA output current and 20-SOIC packaging. Moisture sensitivity level is 3 (168 hours), requiring controlled storage conditions.

SN74LVCH245ADW (Texas Instruments) operates within the original voltage specification with extended temperature range and maintains 24mA output current in 20-SOIC packaging.

Not Recommended for Direct Substitution:

74LVC2245AD,118 (Nexperia) provides only 12mA output current, which does not meet the 24mA requirement of the original part.

Frequently Asked Questions (FAQ)

Q: Can I use SN74LVC245ANSR as a direct replacement for IDT74LVC245ASOG?

A: SN74LVC245ANSR is functionally equivalent but uses a 20-SO package (0.209" width) instead of the 20-SOIC package (0.295" width) of the original part. While both are 20-pin SOIC variants, the different body widths require PCB footprint verification before substitution.

Q: What is the key difference between 74LVC245AD,118 and 74LVC2245AD,118?

A: Both are Nexperia products in the 74LVC family with identical packaging and voltage specifications. The critical difference is output current: 74LVC245AD,118 provides 24mA (matching the original), while 74LVC2245AD,118 provides only 12mA. For applications requiring 24mA output, only 74LVC245AD,118 is suitable.

Q: Why do some substitutes have lower minimum supply voltage (1.2V or 1.65V) than the original (2.7V)?

A: Extended lower voltage limits indicate improved design efficiency in newer product generations. These parts operate correctly at the original 2.7V to 3.6V range and provide additional flexibility for lower-voltage applications. This does not affect compatibility with existing 2.7V to 3.6V systems.

Q: Is MC74LCX245DWG suitable for my application if I need -40°C to 85°C operation?

A: Yes. MC74LCX245DWG operates across -55°C to 125°C, which encompasses the -40°C to 85°C requirement. The extended range provides margin for thermal variations. Note that moisture sensitivity level is 3 (168 hours), requiring controlled storage compared to level 1 (unlimited) of other substitutes.

Q: Can I substitute based on package type alone?

A: No. While package compatibility is necessary, electrical parameters must also align. Output current (24mA minimum), supply voltage range (minimum 2.7V to 3.6V), and operating temperature range (-40°C to 85°C minimum) must all be met. 74LVC2245AD,118, for example, has compatible packaging but insufficient output current.

Q: What does RoHS3 compliance mean for my design?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. All active substitute parts listed are ROHS3 compliant, making them suitable for designs requiring regulatory compliance. The original IDT74LVC245ASOG is RoHS non-compliant due to its obsolete status.

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