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MM74HCT240WMX Equivalent & Substitute Parts
Part Overview
The MM74HCT240WMX is a logic buffer IC with inverting functionality, featuring 2 elements with 4 bits per element and 3-state output capability in a 20-SOIC package. Manufactured by onsemi, this part operates across a 4.5V to 5.5V supply voltage range and is rated for -40°C to 85°C operating temperature. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | MM74HCT240WMX |
| Manufacturer | onsemi |
| Logic Type | Buffer, Inverting |
| Number of Elements | 2 |
| Number of Bits per Element | 4 |
| Output Type | 3-State |
| Current - Output High, Low | 7.2mA, 7.2mA |
| Voltage - Supply | 4.5V ~ 5.5V |
| 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
Substitution for the MM74HCT240WMX is determined by the following critical parameters:
- Logic Type: Buffer, Inverting (2 elements, 4 bits per element)
- Output Type: 3-State
- Voltage Supply Range: 4.5V ~ 5.5V
- Package Type: 20-SOIC surface mount
- Output Current Capability: Minimum 6mA (MM74HCT240WMX rated at 7.2mA)
- Operating Temperature Range: Minimum -40°C ~ 85°C
- RoHS Compliance: ROHS3 Compliant preferred
Substitute parts are grouped into three categories based on manufacturer status and compliance:
MFR Recommended: MC74VHCT240ADWRG (onsemi, active status, enhanced output current)
Direct Substitutes: CD74HCT240M96 and SN74HCT240DWR (Texas Instruments, active status, identical base functionality)
Similar Alternatives: 74HCT240D,653 (Nexperia), CD74HCT240M (Harris, obsolete), SN74HCT240DW (Texas Instruments, discontinued), and SN74HCT240NSR (Texas Instruments, active status, narrower package width)
Parameter Comparison
| Parameter | MM74HCT240WMX | MC74VHCT240ADWRG | CD74HCT240M96 | SN74HCT240DWR | 74HCT240D,653 | SN74HCT240NSR |
|---|---|---|---|---|---|---|
| Manufacturer | onsemi | onsemi | Texas Instruments | Texas Instruments | Nexperia USA Inc. | Texas Instruments |
| Logic Type | Buffer, Inverting | Buffer, Inverting | Buffer, Inverting | Buffer, Inverting | Buffer, Inverting | Buffer, Inverting |
| Number of Elements | 2 | 2 | 2 | 2 | 2 | 2 |
| Number of Bits per Element | 4 | 4 | 4 | 4 | 4 | 4 |
| Output Type | 3-State | 3-State | 3-State | 3-State | 3-State | 3-State |
| Current - Output High, Low | 7.2mA, 7.2mA | 8mA, 8mA | 6mA, 6mA | 6mA, 6mA | 6mA, 6mA | 6mA, 6mA |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -55°C ~ 125°C | -40°C ~ 85°C | -40°C ~ 125°C | -40°C ~ 85°C |
| Package / Case | 20-SOIC (0.295", 7.50mm) | 20-SOIC (0.295", 7.50mm) | 20-SOIC (0.295", 7.50mm) | 20-SOIC (0.295", 7.50mm) | 20-SOIC (0.295", 7.50mm) | 20-SOIC (0.209", 5.30mm) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Product Status | Obsolete | Active | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| MSL Rating | 1 (Unlimited) | 3 (168 Hours) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
Primary Recommendation: MC74VHCT240ADWRG
The MC74VHCT240ADWRG is the manufacturer-recommended substitute from onsemi. It maintains active product status, ROHS3 compliance, and identical electrical specifications within the 4.5V to 5.5V supply range. Output current capability is enhanced at 8mA versus the original 7.2mA, providing improved drive capability. MSL rating of 3 requires standard moisture control during storage and handling.
Secondary Recommendations: CD74HCT240M96 and SN74HCT240DWR
Both parts are direct substitutes from Texas Instruments with active product status and ROHS3 compliance. CD74HCT240M96 offers extended operating temperature range (-55°C to 125°C) and MSL rating of 1 for unlimited moisture exposure. SN74HCT240DWR maintains the original -40°C to 85°C temperature range with MSL rating of 1. Output current is rated at 6mA, which meets minimum requirements but is lower than the original 7.2mA specification.
Alternative Options: 74HCT240D,653 and SN74HCT240NSR
The 74HCT240D,653 from Nexperia provides active status with extended temperature range (-40°C to 125°C) and MSL rating of 1. The SN74HCT240NSR from Texas Instruments is active with standard temperature range and MSL rating of 1, but features a narrower package width (0.209" versus 0.295"), which may require PCB layout verification for pin-to-pin compatibility.
Not Recommended: CD74HCT240M and SN74HCT240DW
CD74HCT240M carries obsolete product status and non-compliant RoHS rating. SN74HCT240DW is discontinued at DiGi Electronics, limiting long-term availability and support.
Frequently Asked Questions (FAQ)
Q: Can MC74VHCT240ADWRG directly replace MM74HCT240WMX in existing designs?
A: Yes. Both parts share identical logic type, element count, bit configuration, output type, and supply voltage range. The MC74VHCT240ADWRG is the manufacturer-recommended substitute with enhanced output current capability. MSL rating of 3 requires standard moisture control during storage.
Q: What is the difference between the 74HCT and 74VHCT series?
A: Both series operate within the same 4.5V to 5.5V supply voltage range and provide identical logic functionality. The 74VHCT series (MC74VHCT240ADWRG) offers enhanced output current capability at 8mA compared to standard 74HCT parts at 6mA to 7.2mA.
Q: Are there package compatibility concerns with SN74HCT240NSR?
A: SN74HCT240NSR uses a narrower 20-SO package (0.209" width) compared to the standard 20-SOIC package (0.295" width) of the MM74HCT240WMX. Pin pitch and lead configuration differ, requiring PCB layout verification before substitution.
Q: Which substitute offers the widest operating temperature range?
A: CD74HCT240M96 and 74HCT240D,653 both support -55°C to -40°C minimum and 125°C maximum, extending beyond the original -40°C to 85°C range. CD74HCT240M96 is recommended due to active product status.
Q: What does MSL rating mean for component selection?
A: MSL (Moisture Sensitivity Level) indicates moisture exposure limits during storage and handling. MSL 1 allows unlimited exposure. MSL 3 limits exposure to 168 hours at specified humidity levels. Parts with MSL 1 (CD74HCT240M96, SN74HCT240DWR, 74HCT240D,653, SN74HCT240NSR) require less stringent moisture control than MC74VHCT240ADWRG with MSL 3.
Q: Is ROHS3 compliance maintained across all active substitutes?
A: Yes. All active substitute parts (MC74VHCT240ADWRG, CD74HCT240M96, SN74HCT240DWR, 74HCT240D,653, and SN74HCT240NSR) maintain ROHS3 compliance, matching the original MM74HCT240WMX specification.
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