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74LVC244ADTR2G Equivalent & Substitute Parts
Part Overview
The 74LVC244ADTR2G is a non-inverting buffer IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability in a 20-TSSOP package. This component operates across a supply voltage range of 1.2V to 3.6V and is rated for -40°C to 125°C operating temperature. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Logic Type | Buffer, Non-Inverting |
| Number of Elements | 2 |
| Number of Bits per Element | 4 |
| Output Type | 3-State |
| Current - Output High, Low | 24mA, 24mA |
| Voltage - Supply | 1.2V ~ 3.6V |
| Operating Temperature | -40°C ~ 125°C (TA) |
| Package / Case | 20-TSSOP (0.173", 4.40mm Width) |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the 74LVC244ADTR2G is determined by the following critical parameters:
Functional Compatibility Requirements:
- Logic type must be Buffer, Non-Inverting
- Number of elements must be 2
- Number of bits per element must be 4
- Output type must be 3-State
Electrical Compatibility Requirements:
- Supply voltage range must encompass or be compatible with 1.2V ~ 3.6V
- Output current capability (24mA, 24mA) must be met or exceeded
- Operating temperature range must support -40°C ~ 125°C or be suitable for the intended application
Physical Compatibility Requirements:
- Package must be 20-TSSOP or equivalent footprint (20-SSOP acceptable with PCB layout verification)
Compliance Requirements:
- RoHS3 compliance required
- MSL rating of 1 (Unlimited) required
Substitute parts are grouped into two categories based on package type: 20-TSSOP direct replacements and 20-SSOP variants requiring footprint verification.
Parameter Comparison
| Part Number | Manufacturer | Series | Status | Voltage Supply | Output Current (H/L) | Temp Range | Package |
|---|---|---|---|---|---|---|---|
| 74LVC244ADTR2G | onsemi | 74LVC | Obsolete | 1.2V ~ 3.6V | 24mA, 24mA | -40°C ~ 125°C | 20-TSSOP |
| MC74LCX244DTR2G | onsemi | 74LCX | Active | 2V ~ 5.5V | 24mA, 24mA | -55°C ~ 125°C | 20-TSSOP |
| SN74LVC2244APW | Texas Instruments | 74LVC | Active | 1.65V ~ 3.6V | 12mA, 12mA | -40°C ~ 85°C | 20-TSSOP |
| SN74LVC2244APWT | Texas Instruments | 74LVC | Active | 1.65V ~ 3.6V | 12mA, 12mA | -40°C ~ 85°C | 20-TSSOP |
| SN74LVCH244ADBR | Texas Instruments | 74LVCH | Active | 1.65V ~ 3.6V | 24mA, 24mA | -40°C ~ 85°C | 20-SSOP |
| SN74LVCH244APW | Texas Instruments | 74LVCH | Active | 1.65V ~ 3.6V | 24mA, 24mA | -40°C ~ 85°C | 20-TSSOP |
| SN74LVCH244APWT | Texas Instruments | 74LVCH | Active | 1.65V ~ 3.6V | 24mA, 24mA | -40°C ~ 85°C | 20-TSSOP |
| SN74LVCZ244ADBR | Texas Instruments | 74LVCZ | Active | 2.7V ~ 3.6V | 24mA, 24mA | -40°C ~ 125°C | 20-SSOP |
| SN74LVCZ244APW | Texas Instruments | 74LVCZ | Active | 2.7V ~ 3.6V | 24mA, 24mA | -40°C ~ 125°C | 20-TSSOP |
| SN74LVCZ244APWR | Texas Instruments | 74LVCZ | Active | 2.7V ~ 3.6V | 24mA, 24mA | -40°C ~ 125°C | 20-TSSOP |
| SN74LVCZ244APWT | Texas Instruments | 74LVCZ | Active | 2.7V ~ 3.6V | 24mA, 24mA | -40°C ~ 125°C | 20-TSSOP |
Engineering Selection Recommendations
Direct Replacement (20-TSSOP Package):
SN74LVCZ244APW, SN74LVCZ244APWR, and SN74LVCZ244APWT are the preferred direct replacements. These Texas Instruments parts maintain the same 20-TSSOP footprint, deliver 24mA output current matching the original specification, and support the full -40°C to 125°C operating temperature range. Supply voltage range of 2.7V ~ 3.6V is compatible with the original 1.2V ~ 3.6V specification for applications operating above 2.7V. All parts are active status with ROHS3 compliance and MSL 1 rating.
SN74LVCH244APW and SN74LVCH244APWT provide alternative 20-TSSOP options with 24mA output current and ROHS3 compliance. Operating temperature range is -40°C ~ 85°C, which is narrower than the original -40°C ~ 125°C specification.
Alternative Voltage Range (20-TSSOP Package):
MC74LCX244DTR2G from onsemi offers extended supply voltage range (2V ~ 5.5V) and extended temperature range (-55°C ~ 125°C) in 20-TSSOP package with 24mA output current. This part is suitable for applications requiring wider voltage or temperature margins.
SN74LVC2244APW and SN74LVC2244APWT provide 20-TSSOP packaging but deliver reduced output current (12mA vs. 24mA) and narrower temperature range (-40°C ~ 85°C). These are suitable only for applications with lower current requirements.
Package Variant (20-SSOP):
SN74LVCH244ADBR and SN74LVCZ244ADBR use 20-SSOP package (0.209", 5.30mm width) instead of 20-TSSOP (0.173", 4.40mm width). PCB layout verification is required before substitution. SN74LVCZ244ADBR maintains full temperature range (-40°C ~ 125°C) and 24mA output current.
All substitute parts maintain ROHS3 compliance and MSL 1 rating as required.
Frequently Asked Questions (FAQ)
Q: Can SN74LVC2244APW replace the 74LVC244ADTR2G directly?
A: SN74LVC2244APW is functionally compatible but has reduced output current (12mA vs. 24mA) and narrower operating temperature range (-40°C ~ 85°C vs. -40°C ~ 125°C). Substitution is valid only if the application does not require 24mA output current or operation above 85°C.
Q: What is the difference between 20-TSSOP and 20-SSOP packages?
A: 20-TSSOP has a width of 0.173" (4.40mm) while 20-SSOP has a width of 0.209" (5.30mm). These are not pin-compatible without PCB layout modification. Verify footprint compatibility before selecting 20-SSOP variants.
Q: Why does MC74LCX244DTR2G have a higher supply voltage range (2V ~ 5.5V)?
A: The 74LCX series is designed for broader voltage compatibility. The 74LVC244ADTR2G operates at 1.2V ~ 3.6V, while MC74LCX244DTR2G extends to 5.5V. Both are compatible for applications within the overlapping 2V ~ 3.6V range.
Q: Is SN74LVCZ244APWR suitable for -40°C ~ 125°C operation?
A: Yes. SN74LVCZ244APWR supports the full -40°C ~ 125°C operating temperature range, matching the original 74LVC244ADTR2G specification. It is available in Tape & Reel packaging.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) rating, meeting the compliance requirements of the original part.
Q: What is the key difference between 74LVCH and 74LVCZ series?
A: The 74LVCH series operates at 1.65V ~ 3.6V with -40°C ~ 85°C temperature range. The 74LVCZ series operates at 2.7V ~ 3.6V with -40°C ~ 125°C temperature range. Select based on your supply voltage and temperature requirements.
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