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CD74HCT244ME4 Equivalent & Substitute Parts
Part Overview
The CD74HCT244ME4 is a non-inverting buffer logic IC manufactured by Texas Instruments, featuring 2 elements with 4 bits per element and 3-state output capability. This component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and production needs. The 20-SOIC surface mount package and 4.5V to 5.5V supply voltage range define its operational scope within digital logic applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | CD74HCT244ME4 |
| Manufacturer | Texas Instruments |
| Logic Type | Buffer, Non-Inverting |
| Number of Elements | 2 |
| Number of Bits per Element | 4 |
| Output Type | 3-State |
| Current - Output High, Low | 6mA, 6mA |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | -55°C ~ 125°C (TA) |
| Mounting Type | Surface Mount |
| Package / Case | 20-SOIC (0.295", 7.50mm Width) |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Product Status | Discontinued at DiGi Electronics |
Substitute Part Grouping Explanation
Substitution eligibility for the CD74HCT244ME4 is determined by strict equivalence across the following critical parameters:
- Logic Type: Buffer, Non-Inverting
- Number of Elements: 2
- Number of Bits per Element: 4
- Output Type: 3-State
- Voltage - Supply: 4.5V ~ 5.5V
- Package / Case: 20-SOIC (0.295", 7.50mm Width)
- Current - Output High, Low: 6mA, 6mA (primary criterion) or 7.2mA, 7.2mA (acceptable variance)
- Operating Temperature Range: -55°C ~ 125°C (TA) or -40°C ~ 125°C (TA) with automotive qualification
Substitute parts are categorized as follows:
MFR Recommended Substitutes: Parts explicitly recommended by manufacturers with identical or superior specifications and active product status.
Parametric Equivalents: Parts meeting all electrical and mechanical parameters with minor variations in packaging format or compliance certifications.
Direct Manufacturer Alternatives: Parts from alternative manufacturers with identical functional specifications and active availability.
Parameter Comparison
| Part Number | Manufacturer | Logic Type | Elements | Bits/Element | Output Type | Current (mA) | Supply Voltage | Temp Range (°C) | Package | Product Status | RoHS |
|---|---|---|---|---|---|---|---|---|---|---|---|
| CD74HCT244ME4 | Texas Instruments | Buffer, Non-Inverting | 2 | 4 | 3-State | 6, 6 | 4.5V ~ 5.5V | -55 ~ 125 | 20-SOIC | Discontinued | ROHS3 |
| CD74HCT244M | Texas Instruments | Buffer, Non-Inverting | 2 | 4 | 3-State | 6, 6 | 4.5V ~ 5.5V | -55 ~ 125 | 20-SOIC | Discontinued | ROHS3 |
| CD74HCT241M | Harris Corporation | Buffer, Non-Inverting | 2 | 4 | 3-State | 6, 6 | 4.5V ~ 5.5V | -55 ~ 125 | 20-SOIC | Obsolete | Non-compliant |
| MC74HCT244ADWR2G | onsemi | Buffer, Non-Inverting | 2 | 4 | 3-State | 6, 6 | 4.5V ~ 5.5V | -55 ~ 125 | 20-SOIC | Active | ROHS3 |
| 74HCT244D,653 | Nexperia USA Inc. | Buffer, Non-Inverting | 2 | 4 | 3-State | 6, 6 | 4.5V ~ 5.5V | -40 ~ 125 | 20-SOIC | Active | ROHS3 |
| 74HCT244D-Q100,118 | Nexperia USA Inc. | Buffer, Non-Inverting | 2 | 4 | 3-State | 6, 6 | 4.5V ~ 5.5V | -40 ~ 125 | 20-SOIC | Active | ROHS3 |
| MM74HCT244WM | Fairchild Semiconductor | Buffer, Non-Inverting | 2 | 4 | 3-State | 7.2, 7.2 | 4.5V ~ 5.5V | -40 ~ 85 | 20-SOIC | Active | Not specified |
| MM74HCT244WMX | Fairchild Semiconductor | Buffer, Non-Inverting | 2 | 4 | 3-State | 7.2, 7.2 | 4.5V ~ 5.5V | -40 ~ 85 | 20-SOIC | Active | Not specified |
| MC74HCT244ADWG | onsemi | Buffer, Non-Inverting | 2 | 4 | 3-State | 6, 6 | 4.5V ~ 5.5V | -55 ~ 125 | 20-SOIC | Active | ROHS3 |
Engineering Selection Recommendations
Primary Recommendation: MC74HCT244ADWR2G (onsemi) or MC74HCT244ADWG (onsemi)
These parts maintain full electrical and mechanical equivalence to the CD74HCT244ME4 with active product status, ROHS3 compliance, and identical operating temperature range (-55°C ~ 125°C). Both are currently in production and available in quantity.
Secondary Recommendation: 74HCT244D,653 or 74HCT244D-Q100,118 (Nexperia USA Inc.)
These parts provide active availability with ROHS3 compliance and identical electrical specifications. The operating temperature range is narrower (-40°C ~ 125°C), suitable for applications not requiring the full -55°C lower limit. The automotive-qualified variant (74HCT244D-Q100,118) is available for applications requiring AEC-Q100 certification.
Alternative Consideration: MM74HCT244WM or MM74HCT244WMX (Fairchild Semiconductor)
These parts are functionally equivalent with active status but feature higher output current capability (7.2mA vs. 6mA) and a narrower operating temperature range (-40°C ~ 85°C). Selection is appropriate only for applications operating within the reduced temperature range and where increased output current is beneficial or neutral.
Not Recommended: CD74HCT241M (Harris Corporation)
This part is classified as obsolete with RoHS non-compliance, making it unsuitable for new designs or production requiring current compliance standards.
Frequently Asked Questions (FAQ)
Q: Can I use MC74HCT244ADWR2G as a direct replacement for CD74HCT244ME4?
A: Yes. The MC74HCT244ADWR2G is a direct functional equivalent with identical logic type, element count, bit configuration, output type, supply voltage, and operating temperature range. The primary difference is packaging format (Tape & Reel vs. unspecified) and active product status, making it the preferred substitute.
Q: What is the difference between 74HCT244D,653 and 74HCT244D-Q100,118?
A: Both parts are electrically and mechanically identical. The 74HCT244D-Q100,118 variant includes AEC-Q100 automotive qualification and is suitable for automotive applications. The 74HCT244D,653 is the standard industrial variant. Operating temperature range is identical (-40°C ~ 125°C) for both.
Q: Why do MM74HCT244WM and MM74HCT244WMX have higher output current (7.2mA vs. 6mA)?
A: The Fairchild Semiconductor variants specify 7.2mA output current capability, which exceeds the original specification. This represents a performance enhancement and does not prevent substitution. However, the narrower operating temperature range (-40°C ~ 85°C) may restrict use in applications requiring the full -55°C lower limit.
Q: Is CD74HCT241M a viable substitute?
A: No. This part is classified as obsolete and RoHS non-compliant, making it unsuitable for current production and design standards.
Q: What packaging formats are available for substitute parts?
A: Substitute parts are available in Tube, Tape & Reel (TR), and unspecified packaging formats. All maintain the 20-SOIC (0.295", 7.50mm Width) surface mount package case. Packaging format selection depends on production volume and handling requirements.
Q: Can I use a substitute part with a narrower operating temperature range?
A: Substitution with a narrower operating temperature range is permissible only if your application operates entirely within the reduced range. The CD74HCT244ME4 specifies -55°C ~ 125°C. Parts with -40°C ~ 125°C or -40°C ~ 85°C ranges are suitable only for applications not requiring operation below -40°C or above 85°C, respectively.
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