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MM74HCT240MTC Equivalent & Substitute Parts
Part Overview
The MM74HCT240MTC is a Buffer, Inverting logic 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 at 5.5V supply voltage with an operating temperature range of -40°C to 85°C. The part is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | MM74HCT240MTC |
| 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-TSSOP (0.173", 4.40mm Width) |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the MM74HCT240MTC is determined by the following critical parameters:
Functional Equivalence: Logic type (Buffer, Inverting), number of elements (2), bits per element (4), and output type (3-State) must remain identical.
Electrical Compatibility: Supply voltage range must encompass or match the 4.5V ~ 5.5V requirement. Output current specifications (7.2mA minimum) must be met or exceeded.
Package Compatibility: All substitutes must use the 20-TSSOP package to ensure PCB footprint compatibility.
Thermal Requirements: Operating temperature range must support the application's -40°C ~ 85°C minimum requirement.
Compliance: RoHS3 compliance and MSL rating must be maintained for manufacturing and environmental standards.
Substitute parts are grouped into two categories: direct 74HCT series equivalents (matching 5.5V supply voltage and temperature range) and 74HC series alternatives (offering extended voltage and temperature ranges).
Parameter Comparison
| Part Number | Manufacturer | Logic Type | Elements / Bits | Output Type | Current (mA) | Supply Voltage | Temp Range (°C) | Package | Status |
|---|---|---|---|---|---|---|---|---|---|
| MM74HCT240MTC | onsemi | Buffer, Inverting | 2 / 4 | 3-State | 7.2 / 7.2 | 4.5V ~ 5.5V | -40 ~ 85 | 20-TSSOP | Obsolete |
| 74HCT240PW,118 | NXP USA Inc. | Buffer, Inverting | 2 / 4 | 3-State | 6 / 6 | 4.5V ~ 5.5V | -40 ~ 125 | 20-TSSOP | Active |
| CD74HCT240PW | Texas Instruments | Buffer, Inverting | 2 / 4 | 3-State | 6 / 6 | 4.5V ~ 5.5V | -55 ~ 125 | 20-TSSOP | Last Time Buy |
| CD74HCT240PWR | Texas Instruments | Buffer, Inverting | 2 / 4 | 3-State | 6 / 6 | 4.5V ~ 5.5V | -55 ~ 125 | 20-TSSOP | Active |
| CD74HCT240PWT | National Semiconductor | Buffer, Inverting | 2 / 4 | 3-State | 6 / 6 | 4.5V ~ 5.5V | -55 ~ 125 | 20-TSSOP | Active |
| SN74HCT240APWR | Texas Instruments | Buffer, Inverting | 2 / 4 | 3-State | 6 / 6 | 4.5V ~ 5.5V | -40 ~ 85 | 20-TSSOP | Active |
| SN74HCT240PW | Texas Instruments | Buffer, Inverting | 2 / 4 | 3-State | 6 / 6 | 4.5V ~ 5.5V | -40 ~ 85 | 20-TSSOP | Discontinued at DiGi Electronics |
| SN74HCT240PWR | Texas Instruments | Buffer, Inverting | 2 / 4 | 3-State | 6 / 6 | 4.5V ~ 5.5V | -40 ~ 85 | 20-TSSOP | Active |
| SN74HCT240PWT | Texas Instruments | Buffer, Inverting | 2 / 4 | 3-State | 6 / 6 | 4.5V ~ 5.5V | -40 ~ 85 | 20-TSSOP | Discontinued at DiGi Electronics |
| MC74HC240ADTR2G | onsemi | Buffer, Inverting | 2 / 4 | 3-State | 7.8 / 7.8 | 2V ~ 6V | -55 ~ 125 | 20-TSSOP | Active |
Engineering Selection Recommendations
Primary Substitutes (74HCT Series - Direct Voltage Match):
SN74HCT240PWR (Texas Instruments, Active status) is the preferred substitute. It maintains identical supply voltage (4.5V ~ 5.5V), matching temperature range (-40°C ~ 85°C), and equivalent output current specifications. Active product status ensures long-term availability and supply chain stability.
CD74HCT240PWR (Texas Instruments, Active status) provides extended operating temperature range (-55°C ~ 125°C) while maintaining the same supply voltage and functional specifications. This option is suitable for applications requiring broader thermal performance.
74HCT240PW,118 (NXP USA Inc., Active status) offers extended temperature range (-40°C ~ 125°C) with identical supply voltage specifications and is available in bulk packaging.
Secondary Substitute (74HC Series - Extended Voltage Range):
MC74HC240ADTR2G (onsemi, Active status) operates across 2V ~ 6V supply voltage, providing broader voltage compatibility. This part is suitable for applications with variable supply conditions. Extended temperature range (-55°C ~ 125°C) and higher output current (7.8mA) exceed original specifications.
Compliance Status:
All recommended substitutes maintain ROHS3 compliance and MSL rating of 1 (Unlimited), meeting manufacturing and environmental standards equivalent to the original part.
Frequently Asked Questions (FAQ)
Q: Can I use MC74HC240ADTR2G as a direct replacement for MM74HCT240MTC?
A: MC74HC240ADTR2G is functionally equivalent but operates across a wider voltage range (2V ~ 6V versus 4.5V ~ 5.5V). It is electrically compatible in 5V systems and provides superior performance margins. The 74HC series is a valid substitute when the extended voltage range does not conflict with system design constraints.
Q: What is the difference between 74HCT and 74HC series buffers?
A: The 74HCT series is optimized for 5V TTL-compatible systems with supply voltage 4.5V ~ 5.5V. The 74HC series operates across a broader voltage range (2V ~ 6V) and offers extended temperature specifications. Both maintain identical logic functionality and package compatibility.
Q: Are all substitute parts available in the same package?
A: All listed substitutes use the 20-TSSOP package, ensuring PCB footprint compatibility. Packaging options (Tube, Tape & Reel, Bulk) vary by manufacturer and supplier but do not affect electrical or mechanical fit.
Q: Which substitute has the best long-term availability?
A: SN74HCT240PWR (Texas Instruments) and CD74HCT240PWR (Texas Instruments) both carry Active product status, indicating ongoing production and supply chain support. These are the recommended choices for new designs requiring extended component lifecycle.
Q: Can I use parts listed as "Discontinued at DiGi Electronics" in production designs?
A: Parts marked "Discontinued at DiGi Electronics" may still be available through alternative distributors or direct manufacturer channels. For production designs, prioritize parts with Active status to ensure supply continuity.
Q: What output current specification should I verify for my application?
A: The original MM74HCT240MTC specifies 7.2mA output current. Most 74HCT substitutes provide 6mA, which is acceptable for standard logic-level loads. MC74HC240ADTR2G provides 7.8mA, exceeding the original specification. Verify your application's load requirements against the selected substitute's datasheet.
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