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74VHCT245AM Equivalent & Substitute Parts
Part Overview
The 74VHCT245AM is a non-inverting transceiver IC manufactured by onsemi, featuring 1 element with 8 bits per element and 3-state output capability in a 20-SOIC package. This component operates across a 4.5V to 5.5V supply voltage range with output current ratings of 8mA for both high and low states. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 74VHCT245AM |
| Manufacturer | onsemi |
| Logic Type | Transceiver, Non-Inverting |
| Number of Elements | 1 |
| Number of Bits per Element | 8 |
| Output Type | 3-State |
| Current - Output High, Low | 8mA, 8mA |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 20-SOIC (0.295", 7.50mm Width) |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution for the 74VHCT245AM is determined by the following critical parameters:
Logic Type: Transceiver, Non-Inverting (functional equivalence) Number of Elements: 1 and Number of Bits per Element: 8 (pin count and functionality) Output Type: 3-State (bus interface capability) Current - Output High, Low: 8mA, 8mA (drive capability) Voltage - Supply: 4.5V ~ 5.5V (power supply compatibility) Package / Case: 20-SOIC (0.295", 7.50mm Width) (physical and electrical footprint)
Substitute parts are grouped into three categories based on their relationship to the main part:
Parametric Equivalents: Parts with identical electrical specifications and the same 20-SOIC package, differing only in product status or packaging format.
Direct Equivalents: Parts from alternative manufacturers (Texas Instruments, NXP Semiconductors) that maintain identical core specifications and package compatibility.
Upgrade Parts: Parts with enhanced specifications (extended temperature range, automotive qualification) or alternative packaging that provide functional compatibility with potential performance improvements.
Parameter Comparison
| Parameter | 74VHCT245AM (Main) | MC74VHCT245ADWG | SN74AHCT245DWR | SN74LV245ATDW | 74AHCT245D,118 | 74AHCT245D-Q100J | 74VHCT245D,118 |
|---|---|---|---|---|---|---|---|
| Manufacturer | onsemi | onsemi | Texas Instruments | Texas Instruments | NXP Semiconductors | Nexperia USA Inc. | NXP Semiconductors |
| Logic Type | Transceiver, Non-Inverting | Transceiver, Non-Inverting | Transceiver, Non-Inverting | Transceiver, Non-Inverting | Transceiver, Non-Inverting | Transceiver, Non-Inverting | Transceiver, Non-Inverting |
| Number of Elements | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Number of Bits per Element | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
| Output Type | 3-State | 3-State | 3-State | 3-State | 3-State | 3-State | 3-State |
| Current - Output High, Low | 8mA, 8mA | 8mA, 8mA | 8mA, 8mA | 16mA, 16mA | 8mA, 8mA | 8mA, 8mA | 8mA, 8mA |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C |
| Package / Case | 20-SOIC | 20-SOIC | 20-SOIC | 20-SOIC | 20-SOIC | 20-SOIC | 20-SOIC |
| Product Status | Obsolete | Active | Active | Last Time Buy | Active | Active | Obsolete |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | RoHS non-compliant |
Engineering Selection Recommendations
For applications requiring direct replacement of the 74VHCT245AM, MC74VHCT245ADWG from onsemi provides parametric equivalence with active product status, ensuring long-term availability and support. This part maintains identical electrical specifications and 20-SOIC packaging while offering improved supply chain continuity.
For designs requiring extended operating temperature range (-40°C to 125°C), SN74AHCT245DWR from Texas Instruments or 74AHCT245D,118 from NXP Semiconductors are suitable alternatives. Both maintain the core 8mA output current specification and 20-SOIC package footprint while providing enhanced thermal performance.
The 74AHCT245D-Q100J from Nexperia USA Inc. is specified for automotive applications with AEC-Q100 qualification, suitable for designs requiring automotive-grade components within the same electrical and package specifications.
SN74LV245ATDW from Texas Instruments offers increased output current capability (16mA vs. 8mA) with extended temperature range, providing enhanced drive capability for applications with higher current demands. This part is classified as Last Time Buy, limiting future availability.
The 74VHCT245D,118 from NXP Semiconductors is classified as obsolete and non-compliant with RoHS3 standards, making it unsuitable for new designs or applications requiring regulatory compliance.
Frequently Asked Questions (FAQ)
Q: Can MC74VHCT245ADWG be used as a direct replacement for 74VHCT245AM?
A: Yes. MC74VHCT245ADWG is a parametric equivalent with identical logic type, element count, bit width, output type, current ratings, supply voltage, and 20-SOIC package. The primary difference is product status (active vs. obsolete) and packaging format (tube vs. standard), making it a suitable direct replacement.
Q: What is the difference between 74AHCT245D,118 and 74VHCT245D,118?
A: Both parts share identical electrical specifications (8mA output current, 4.5V-5.5V supply, 20-SOIC package) and logic function. The primary differences are manufacturer (NXP vs. NXP), product status (active vs. obsolete), and RoHS compliance (ROHS3 compliant vs. non-compliant). 74AHCT245D,118 is recommended for new designs.
Q: Why does SN74LV245ATDW have higher output current (16mA vs. 8mA)?
A: SN74LV245ATDW is from the 74LV logic family, which features enhanced drive capability compared to the 74VHCT and 74AHCT families. This higher current rating provides greater fanout capability while maintaining the same 20-SOIC package and supply voltage range. Verify that your application can tolerate the increased power dissipation.
Q: Is the 20-SOIC package identical across all substitute parts?
A: Yes. All substitute parts use the 20-SOIC (0.295", 7.50mm Width) package, ensuring identical PCB footprint and pin compatibility. Verify pinout documentation for your specific application to confirm signal assignments.
Q: Can I use 74AHCT245D-Q100J in non-automotive applications?
A: Yes. The automotive qualification (AEC-Q100) indicates enhanced reliability and testing standards, making this part suitable for any application requiring the same electrical specifications. The automotive grade does not restrict use in non-automotive designs.
Q: Why is 74VHCT245D,118 not recommended despite being a substitute?
A: 74VHCT245D,118 is classified as obsolete and does not comply with RoHS3 standards. For new designs or applications requiring regulatory compliance, active and RoHS3-compliant alternatives such as MC74VHCT245ADWG or 74AHCT245D,118 are preferred to ensure long-term availability and environmental compliance.
Q: What is the impact of extended temperature range (-40°C to 125°C vs. -40°C to 85°C)?
A: Extended temperature range indicates the part has been qualified for operation at higher ambient temperatures. If your application operates within the original -40°C to 85°C range, both specifications are functionally equivalent. Extended range provides additional design margin for thermal stress conditions.
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