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MM74HC251MX Equivalent & Substitute Parts
Part Overview
The MM74HC251MX is a 1 x 8:1 multiplexer logic IC manufactured by onsemi in a 16-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The MM74HC251MX operates from a single supply voltage of 2V to 6V with output currents of 5.2mA (both high and low), and supports operating temperatures from -40°C to 85°C.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Part Number | MM74HC251MX |
| Manufacturer | onsemi |
| Type | Multiplexer 1 x 8:1 |
| Package | 16-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Voltage Supply | 2V ~ 6V (Single Supply) |
| Output Current (High/Low) | 5.2mA / 5.2mA |
| Operating Temperature | -40°C ~ 85°C |
| Product Status | Obsolete |
| Series | 74HC |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the MM74HC251MX is determined by the following critical parameters:
- Circuit Configuration: 1 x 8:1 multiplexer topology
- Package Type: 16-SOIC surface mount package (0.154", 3.90mm width)
- Voltage Supply Range: 2V ~ 6V single supply operation
- Output Current Capability: Minimum 5.2mA (high and low)
- Series Compatibility: 74HC logic family
- Mounting Technology: Surface mount only
Substitute parts must maintain identical circuit configuration, package footprint, and voltage supply specifications. Output current capability may be equal or greater. Operating temperature range may be extended in active alternatives. All substitutes must be in 16-SOIC packaging to ensure PCB compatibility.
Parameter Comparison
| Part Number | Manufacturer | Circuit | Package | Voltage Supply | Output Current (High/Low) | Operating Temperature | Product Status |
|---|---|---|---|---|---|---|---|
| MM74HC251MX | onsemi | 1 x 8:1 | 16-SOIC | 2V ~ 6V | 5.2mA / 5.2mA | -40°C ~ 85°C | Obsolete |
| MC74HC251ADG | onsemi | 1 x 8:1 | 16-SOIC | 2V ~ 6V | 5.2mA / 5.2mA | -55°C ~ 125°C | Active |
| MC74HC251ADR2G | onsemi | 1 x 8:1 | 16-SOIC | 2V ~ 6V | 5.2mA / 5.2mA | -55°C ~ 125°C | Active |
| SN74HC251D | Texas Instruments | 1 x 8:1 | 16-SOIC | 2V ~ 6V | 7.8mA / 7.8mA | -40°C ~ 85°C | Discontinued at DiGi Electronics |
| SN74HC251DR | Texas Instruments | 1 x 8:1 | 16-SOIC | 2V ~ 6V | 7.8mA / 7.8mA | -40°C ~ 85°C | Active |
| SN74HC251DT | Texas Instruments | 1 x 8:1 | 16-SOIC | 2V ~ 6V | 7.8mA / 7.8mA | -40°C ~ 85°C | Discontinued at DiGi Electronics |
| 74HC251D,653 | Nexperia USA Inc. | 1 x 8:1 | 16-SOIC | 2V ~ 6V | 5.2mA / 5.2mA | -40°C ~ 125°C | Active |
| 74HC251D-Q100J | Nexperia USA Inc. | 1 x 8:1 | 16-SOIC | 2V ~ 6V | 5.2mA / 5.2mA | -40°C ~ 125°C | Active |
| CD74HC251M | Harris Corporation | 1 x 8:1 | 16-SOIC | 2V ~ 6V | 5.2mA / 5.2mA | -55°C ~ 125°C | Obsolete |
| CD74HC251M96 | Harris Corporation | 1 x 8:1 | 16-SOIC | 2V ~ 6V | 5.2mA / 5.2mA | -55°C ~ 125°C | Obsolete |
| CD74HC251MT | Texas Instruments | 1 x 8:1 | 16-SOIC | 2V ~ 6V | 5.2mA / 5.2mA | -55°C ~ 125°C | Last Time Buy |
Engineering Selection Recommendations
Preferred Active Substitutes:
MC74HC251ADG and MC74HC251ADR2G (onsemi) are direct functional equivalents with extended operating temperature range (-55°C to 125°C) and active product status. Both maintain identical output current specifications (5.2mA) and voltage supply range. MC74HC251ADR2G is supplied in Tape & Reel packaging with higher inventory availability (2141 pcs).
SN74HC251DR (Texas Instruments) is an active alternative with higher output current capability (7.8mA) and identical voltage and temperature specifications to the original part. This part is suitable for applications requiring increased drive capability.
74HC251D,653 (Nexperia USA Inc.) provides active product status with extended temperature range (-40°C to 125°C) and equivalent output current (5.2mA). This part is available in Cut Tape & Digi-Reel packaging.
74HC251D-Q100J (Nexperia USA Inc.) is an automotive-qualified variant (AEC-Q100) with identical electrical specifications and extended temperature range, suitable for automotive applications.
Obsolete Alternatives (Not Recommended for New Designs):
CD74HC251M, CD74HC251M96, and CD74HC251MT are obsolete or end-of-life parts. CD74HC251MT carries Last Time Buy status. These parts should only be used for legacy system maintenance or repair.
Compliance Considerations:
MC74HC251ADG, MC74HC251ADR2G, SN74HC251DR, 74HC251D,653, and 74HC251D-Q100J all carry RoHS3 compliance certification. CD74HC251M and CD74HC251M96 are RoHS non-compliant and unsuitable for new designs subject to RoHS requirements.
Frequently Asked Questions (FAQ)
Q: Can I use SN74HC251DR as a direct replacement for MM74HC251MX?
A: Yes. SN74HC251DR maintains the same 1 x 8:1 multiplexer circuit, 16-SOIC package, 2V-6V supply voltage, and -40°C to 85°C operating temperature range. The higher output current (7.8mA vs 5.2mA) is compatible and provides additional drive capability. SN74HC251DR is currently active in production.
Q: What is the difference between MC74HC251ADG and MC74HC251ADR2G?
A: Both parts are electrically identical onsemi 74HC251 multiplexers with identical specifications. The primary difference is packaging: MC74HC251ADG is supplied in Tube packaging, while MC74HC251ADR2G is supplied in Tape & Reel (TR) format. MC74HC251ADR2G has higher inventory availability (2141 pcs vs 1677 pcs).
Q: Is the 74HC251D-Q100J suitable for automotive applications?
A: Yes. The 74HC251D-Q100J carries AEC-Q100 automotive qualification and is rated for -40°C to 125°C operation. It maintains the same 1 x 8:1 multiplexer function and 16-SOIC package as the MM74HC251MX.
Q: Why are some substitutes marked as obsolete?
A: CD74HC251M, CD74HC251M96, and CD74HC251MT are end-of-life parts from Harris Corporation and Texas Instruments. These parts should not be selected for new designs. Active alternatives from onsemi, Texas Instruments, and Nexperia are recommended instead.
Q: Can I use parts with extended temperature ranges (-55°C to 125°C) in place of the MM74HC251MX (-40°C to 85°C)?
A: Yes. Extended temperature range parts are fully compatible with applications requiring only -40°C to 85°C operation. The wider temperature specification provides additional design margin and is suitable for all MM74HC251MX applications.
Q: What packaging options are available for 74HC251 multiplexers?
A: All listed substitutes are supplied in 16-SOIC surface mount packages with 0.154" (3.90mm) width. Packaging variations include Tube, Tape & Reel (TR), Cut Tape (CT) & Digi-Reel, and Bulk formats. Package selection depends on production volume and assembly requirements, but all maintain identical PCB footprints.
Q: Are there RoHS compliance differences between substitutes?
A: Yes. MC74HC251ADG, MC74HC251ADR2G, SN74HC251DR, SN74HC251DT, 74HC251D,653, 74HC251D-Q100J, and CD74HC251MT are RoHS3 compliant. CD74HC251M and CD74HC251M96 are RoHS non-compliant. For applications subject to RoHS requirements, select only RoHS3 compliant alternatives.
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