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74LCX245WMX Equivalent & Substitute Parts
Part Overview
The 74LCX245WMX is a non-inverting transceiver logic IC manufactured by onsemi, designed for 8-bit data bus applications with 3-state output capability. This part operates across a 2V to 3.6V supply voltage range and is housed in a 20-SOIC package. The 74LCX245WMX is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional equivalence as a non-inverting transceiver with 1 element, 8 bits per element, and 3-state output configuration.
Substiute Parts
Key Parameters
| Parameter | 74LCX245WMX |
|---|---|
| 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 | 24mA, 24mA |
| Voltage - Supply | 2V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 20-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitute parts for the 74LCX245WMX are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:
- Logic Type: Transceiver, Non-Inverting (mandatory match)
- Number of Elements: 1 (mandatory match)
- Number of Bits per Element: 8 (mandatory match)
- Output Type: 3-State (mandatory match)
- Output Current: 24mA, 24mA (mandatory match)
- Package / Case: 20-SOIC form factor (mandatory match)
- Mounting Type: Surface Mount (mandatory match)
Substitute parts are grouped into three categories:
MFR Recommended: Parts from the original manufacturer (onsemi) with extended voltage and temperature specifications, offering direct functional replacement with enhanced operating range.
Direct Manufacturer: Parts from alternative manufacturers (Texas Instruments, Nexperia USA Inc.) that meet or exceed the electrical specifications of the original part while maintaining the same functional configuration.
Similar Parts: Variants within compatible series (74LVC, 74LVCH) that provide functional equivalence with minor packaging or series designation differences.
Parameter Comparison
| Part Number | Manufacturer | Logic Type | Elements / Bits | Output Type | Output Current (mA) | Voltage Supply (V) | Temp Range (°C) | Package | Product Status | MSL |
|---|---|---|---|---|---|---|---|---|---|---|
| 74LCX245WMX | onsemi | Transceiver, Non-Inverting | 1 / 8 | 3-State | 24, 24 | 2.0 ~ 3.6 | -40 ~ 85 | 20-SOIC | Obsolete | 1 |
| MC74LCX245DWR2G | onsemi | Transceiver, Non-Inverting | 1 / 8 | 3-State | 24, 24 | 2.0 ~ 5.5 | -55 ~ 125 | 20-SOIC | Active | 3 |
| MC74LCX245DWG | onsemi | Transceiver, Non-Inverting | 1 / 8 | 3-State | 24, 24 | 2.0 ~ 5.5 | -55 ~ 125 | 20-SOIC | Active | 3 |
| SN74LVC245ADWR | Texas Instruments | Transceiver, Non-Inverting | 1 / 8 | 3-State | 24, 24 | 1.65 ~ 3.6 | -40 ~ 125 | 20-SOIC | Active | 1 |
| 74LVC245AD,118 | Nexperia USA Inc. | Transceiver, Non-Inverting | 1 / 8 | 3-State | 24, 24 | 1.2 ~ 3.6 | -40 ~ 125 | 20-SOIC | Active | 1 |
| 74LVCH245AD,118 | Nexperia USA Inc. | Transceiver, Non-Inverting | 1 / 8 | 3-State | 24, 24 | 1.2 ~ 3.6 | -40 ~ 125 | 20-SOIC | Active | 1 |
| SN74LVC245ADW | Texas Instruments | Transceiver, Non-Inverting | 1 / 8 | 3-State | 24, 24 | 1.65 ~ 3.6 | -40 ~ 125 | 20-SOIC | Active | 1 |
| SN74LVC245ANS | Texas Instruments | Transceiver, Non-Inverting | 1 / 8 | 3-State | 24, 24 | 1.65 ~ 3.6 | -40 ~ 125 | 20-SOIC | Active | 1 |
| SN74LVC245ANSR | Texas Instruments | Transceiver, Non-Inverting | 1 / 8 | 3-State | 24, 24 | 1.65 ~ 3.6 | -40 ~ 125 | 20-SOIC | Active | 1 |
| SN74LVCH245ADW | Texas Instruments | Transceiver, Non-Inverting | 1 / 8 | 3-State | 24, 24 | 1.65 ~ 3.6 | -40 ~ 125 | 20-SOIC | Active | 1 |
| SN74LVCH245ADWR | Texas Instruments | Transceiver, Non-Inverting | 1 / 8 | 3-State | 24, 24 | 1.65 ~ 3.6 | -40 ~ 125 | 20-SOIC | Active | 1 |
Engineering Selection Recommendations
All listed substitute parts maintain full functional equivalence to the 74LCX245WMX as non-inverting transceivers with 1 element, 8 bits per element, and 3-state output. All substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance profile of the original part.
For applications requiring direct replacement with minimal design modification, SN74LVC245ADWR, SN74LVC245ADW, and SN74LVCH245ADWR from Texas Instruments are active products with established supply chains and MSL 1 rating, identical to the original part's moisture sensitivity classification.
For applications where extended operating temperature range is beneficial, MC74LCX245DWR2G and MC74LCX245DWG from onsemi provide -55°C to 125°C operation compared to the original -40°C to 85°C range, though these parts carry MSL 3 classification requiring controlled storage conditions.
For applications requiring lower minimum supply voltage operation, 74LVC245AD,118 and 74LVCH245AD,118 from Nexperia USA Inc. support 1.2V minimum supply voltage with MSL 1 rating and active product status.
Frequently Asked Questions (FAQ)
Q: Can I directly substitute the 74LCX245WMX with any of the listed parts?
A: Yes, all listed parts maintain the same logic type (non-inverting transceiver), element count (1), bit count per element (8), output type (3-state), output current (24mA), and 20-SOIC package configuration. Direct PCB substitution is electrically valid for all listed alternatives.
Q: What is the difference between the onsemi MC74LCX245DWR2G and the original 74LCX245WMX?
A: The MC74LCX245DWR2G extends the supply voltage range to 5.5V (versus 3.6V maximum for the original) and operating temperature to -55°C to 125°C (versus -40°C to 85°C). The MSL rating increases from 1 to 3, requiring moisture control during storage and handling.
Q: Why do some substitute parts have different package designations (20-SO versus 20-SOIC)?
A: The 20-SO and 20-SOIC designations refer to the same physical package form factor (0.295" or 0.209" width depending on the part). Both are surface-mount packages compatible with standard PCB layouts designed for 20-pin SOIC components.
Q: Are all substitute parts currently in active production?
A: The original 74LCX245WMX is obsolete. All listed substitute parts are classified as active products, ensuring ongoing availability and support from their respective manufacturers.
Q: What is the significance of the MSL rating difference between parts?
A: MSL 1 parts (74LCX245WMX, SN74LVC245ADWR, and others) have unlimited shelf life under normal conditions. MSL 3 parts (MC74LCX245DWR2G, MC74LCX245DWG) require storage at controlled humidity and temperature, with a 168-hour floor life after moisture exposure. Selection depends on your supply chain and storage capabilities.
Q: Can I use SN74LVC245ANSR in place of SN74LVC245ADWR?
A: Yes. Both parts are from Texas Instruments, maintain identical electrical specifications, and differ only in packaging format (Tape & Reel versus Cut Tape & Digi-Reel). The functional performance and pin configuration are identical.
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