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SN74HC244QDWREP Equivalent & Substitute Parts
Part Overview
The SN74HC244QDWREP is a non-inverting buffer logic IC manufactured by Texas Instruments, designed for 2V to 6V supply voltage operation with 3-state output capability. This device functions as a 2-element, 4-bit buffer with 7.8mA output current per line and operates across the industrial temperature range of -40°C to 125°C. The part is currently in active product status with ROHS3 compliance and unlimited moisture sensitivity rating.
Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when automotive-grade qualification is mandated for specific applications.
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 | 7.8mA, 7.8mA |
| Voltage - Supply | 2V ~ 6V |
| Operating Temperature | -40°C ~ 125°C (TA) |
| Package / Case | 20-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the SN74HC244QDWREP is determined by the following criteria:
Primary Substitution Parameters:
- Logic Type: Buffer, Non-Inverting
- Number of Elements: 2
- Number of Bits per Element: 4
- Output Type: 3-State
- Current - Output High, Low: 7.8mA, 7.8mA
- Voltage - Supply: 2V ~ 6V
- Package / Case: 20-SOIC (0.295", 7.50mm Width)
- Mounting Type: Surface Mount
Secondary Considerations:
- Operating Temperature Range (must meet or exceed -40°C to 125°C minimum)
- Packaging format (Tape & Reel, Cut Tape, Tube, or Bulk)
- Product Status (Active or Obsolete)
- Compliance certifications (RoHS, REACH, AEC-Q100 for automotive applications)
All listed substitute parts maintain identical electrical specifications and package dimensions, with variations only in manufacturer, packaging format, temperature range extensions, and automotive qualification status.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Product Status | Operating Temperature | Packaging | Current Output (mA) | Supply Voltage | AEC-Q100 |
|---|---|---|---|---|---|---|---|
| SN74HC244QDWREP | Texas Instruments | Active | -40°C ~ 125°C | Tape & Reel (TR) | 7.8 / 7.8 | 2V ~ 6V | No |
| SN74HC244QDWRG4Q1 | Texas Instruments | Obsolete | -40°C ~ 125°C | Tape & Reel (TR) | 7.8 / 7.8 | 2V ~ 6V | Yes |
| SN74HC244QDWRQ1 | Texas Instruments | Active | -40°C ~ 125°C | Tape & Reel (TR) | 7.8 / 7.8 | 2V ~ 6V | Yes |
| MC74HC244ADWG | onsemi | Active | -55°C ~ 125°C | Tube | 7.8 / 7.8 | 2V ~ 6V | No |
| MC74HC244ADWR2G | onsemi | Active | -55°C ~ 125°C | Cut Tape (CT) & Digi-Reel® | 7.8 / 7.8 | 2V ~ 6V | No |
| MM74HC244WM | onsemi | Active | -40°C ~ 85°C | Tube | 7.8 / 7.8 | 2V ~ 6V | No |
| MM74HC244WMX | Fairchild Semiconductor | Active | -40°C ~ 85°C | Not specified | 7.8 / 7.8 | 2V ~ 6V | No |
| 74HC241D,653 | NXP Semiconductors | Active | -40°C ~ 125°C | Bulk | 7.8 / 7.8 | 2V ~ 6V | No |
| 74HC244D,653 | Nexperia USA Inc. | Active | -40°C ~ 125°C | Cut Tape (CT) & Digi-Reel® | 7.8 / 7.8 | 2V ~ 6V | No |
| 74HC244D-Q100,118 | NXP USA Inc. | Active | -40°C ~ 125°C | Bulk | 7.8 / 7.8 | 2V ~ 6V | No |
Engineering Selection Recommendations
For Standard Industrial Applications: Select from SN74HC244QDWRQ1 (Texas Instruments, Active, AEC-Q100 qualified), 74HC244D,653 (Nexperia, Active, full temperature range), or 74HC244D-Q100,118 (NXP, Active, full temperature range). These parts maintain active product status and support the complete -40°C to 125°C operating range.
For Automotive Applications: SN74HC244QDWRQ1 is the primary selection, offering AEC-Q100 qualification with active product status and full temperature range support. This part is specifically qualified for automotive-grade requirements.
For Extended Low-Temperature Operation: MC74HC244ADWG and MC74HC244ADWR2G (onsemi) extend the lower operating limit to -55°C, suitable for applications requiring enhanced cold-temperature performance.
For Restricted Temperature Range Applications: MM74HC244WM and MM74HC244WMX are suitable only for applications with maximum operating temperature not exceeding 85°C, as these parts are rated to -40°C to 85°C only.
Packaging Considerations:
- Tape & Reel format: SN74HC244QDWREP, SN74HC244QDWRG4Q1, SN74HC244QDWRQ1
- Cut Tape & Digi-Reel: MC74HC244ADWR2G, 74HC244D,653
- Tube packaging: MC74HC244ADWG, MM74HC244WM
- Bulk packaging: 74HC241D,653, 74HC244D-Q100,118
Obsolete Part Status: SN74HC244QDWRG4Q1 is marked as Obsolete and should be avoided for new designs unless existing inventory constraints require its use.
Frequently Asked Questions (FAQ)
Q: Can I substitute MM74HC244WM for SN74HC244QDWREP in all applications?
A: No. MM74HC244WM has a reduced operating temperature range of -40°C to 85°C, compared to the SN74HC244QDWREP range of -40°C to 125°C. Substitution is valid only for applications where the maximum operating temperature does not exceed 85°C.
Q: What is the difference between SN74HC244QDWRQ1 and SN74HC244QDWREP?
A: Both parts are manufactured by Texas Instruments with identical electrical specifications and operating temperature range (-40°C to 125°C). The primary difference is that SN74HC244QDWRQ1 carries AEC-Q100 automotive qualification, making it suitable for automotive applications. SN74HC244QDWREP is the standard industrial-grade version.
Q: Are onsemi MC74HC244ADWG and MC74HC244ADWR2G interchangeable?
A: Both parts are electrically identical with the same -55°C to 125°C operating range. The difference is packaging format: MC74HC244ADWG is supplied in Tube packaging, while MC74HC244ADWR2G is supplied in Cut Tape & Digi-Reel format. Select based on your manufacturing process requirements.
Q: Why does 74HC241D,653 appear as a substitute if it has a different base part number?
A: The 74HC241D,653 is a parametric equivalent with identical electrical specifications, output configuration, and package dimensions. The base part number difference (74HC241 vs. 74HC244) reflects manufacturer designation, but both devices function identically as 2-element, 4-bit non-inverting buffers with 3-state outputs.
Q: Can I use NXP parts as direct replacements for Texas Instruments parts?
A: Yes. The NXP 74HC244D,653 and 74HC244D-Q100,118 are parametric equivalents with identical electrical specifications, output current ratings, supply voltage range, and operating temperature range. Substitution is valid from an electrical standpoint; verify packaging format compatibility with your assembly process.
Q: What does MSL (Moisture Sensitivity Level) mean for substitution?
A: MSL indicates moisture sensitivity during storage and handling. SN74HC244QDWREP has MSL 1 (Unlimited), meaning no moisture precautions are required. onsemi parts have MSL 3 (168 Hours), requiring controlled storage conditions. If your supply chain does not support MSL 3 handling, select parts with MSL 1 rating.
Q: Is the SN74HC244QDWRG4Q1 still available for new designs?
A: No. This part is marked as Obsolete and should not be selected for new designs. Use SN74HC244QDWRQ1 (Active, AEC-Q100 qualified) or other active alternatives instead.
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