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74ACTQ240SJ Equivalent & Substitute Parts
Part Overview
The 74ACTQ240SJ is an inverting buffer logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The part operates within a 4.5V to 5.5V supply voltage range and is rated for -40°C to 85°C operating temperature.
Substiute Parts
Key Parameters
| Parameter | Specification |
|---|---|
| Logic Type | Buffer, Inverting |
| Number of Elements | 2 |
| Number of Bits per Element | 4 |
| Output Type | 3-State |
| Current - Output High, Low | 24mA, 24mA |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution eligibility for the 74ACTQ240SJ is determined by strict equivalence across the following parameters: logic type (Buffer, Inverting), number of elements (2), bits per element (4), output type (3-State), output current ratings (24mA high and low), supply voltage range (4.5V ~ 5.5V), and operating temperature range (-40°C ~ 85°C). Package variations are permitted provided the component maintains surface mount technology and electrical compatibility. All identified substitutes meet these core electrical and functional requirements.
Parameter Comparison
| Part Number | Manufacturer | Logic Type | Elements | Bits/Element | Output Type | Output Current (mA) | Supply Voltage | Temp Range | Package | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|
| 74ACTQ240SJ | onsemi | Buffer, Inverting | 2 | 4 | 3-State | 24/24 | 4.5V ~ 5.5V | -40°C ~ 85°C | 20-SOP | Obsolete |
| MC74ACT240DWG | onsemi | Buffer, Inverting | 2 | 4 | 3-State | 24/24 | 4.5V ~ 5.5V | -40°C ~ 85°C | 20-SOIC | Obsolete |
| MC74ACT240DWR2G | onsemi | Buffer, Inverting | 2 | 4 | 3-State | 24/24 | 4.5V ~ 5.5V | -40°C ~ 85°C | 20-SOIC | Active |
| CD74ACT240M | Harris Corporation | Buffer, Inverting | 2 | 4 | 3-State | 24/24 | 4.5V ~ 5.5V | -40°C ~ 85°C | 20-SOIC | Obsolete |
| CD74ACT240M96 | Texas Instruments | Buffer, Inverting | 2 | 4 | 3-State | 24/24 | 4.5V ~ 5.5V | -40°C ~ 85°C | 20-SOIC | Active |
| SN74ACT240DWR | Texas Instruments | Buffer, Inverting | 2 | 4 | 3-State | 24/24 | 4.5V ~ 5.5V | -40°C ~ 85°C | 20-SOIC | Active |
| SN74ACT240NSR | Texas Instruments | Buffer, Inverting | 2 | 4 | 3-State | 24/24 | 4.5V ~ 5.5V | -40°C ~ 85°C | 20-SO | Active |
Engineering Selection Recommendations
For new designs and procurement, MC74ACT240DWR2G, CD74ACT240M96, SN74ACT240DWR, and SN74ACT240NSR are preferred due to active product status. MC74ACT240DWR2G and CD74ACT240M96 carry ROHS3 compliance certification. SN74ACT240DWR and SN74ACT240NSR are supplied by Texas Instruments with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). For legacy system maintenance where the original 74ACTQ240SJ is required, MC74ACT240DWG and CD74ACT240M remain available as obsolete alternatives with identical electrical specifications.
Frequently Asked Questions (FAQ)
Q: Can SN74ACT240DWR replace 74ACTQ240SJ directly? A: Yes. Both parts share identical logic type, element count, bit configuration, output type, current ratings, supply voltage, and operating temperature specifications. The package differs (20-SOIC versus 20-SOP), but both are surface mount configurations with compatible pinouts for the 74ACT240 base product number.
Q: What is the difference between 20-SOP and 20-SOIC packages? A: Both are surface mount packages with 20 pins. The 20-SOP (0.209" width, 5.30mm) and 20-SOIC (0.295" width, 7.50mm) differ in physical dimensions. PCB layout and footprint design must accommodate the specific package selected.
Q: Are all substitute parts RoHS compliant? A: MC74ACT240DWR2G, CD74ACT240M96, SN74ACT240DWR, and SN74ACT240NSR are ROHS3 compliant. MC74ACT240DWG is ROHS3 compliant. CD74ACT240M is RoHS non-compliant.
Q: Which substitute has the highest inventory availability? A: CD74ACT240M has 20,753 pieces in stock. MC74ACT240DWR2G has 3,300 pieces. SN74ACT240NSR has 2,928 pieces. SN74ACT240DWR has 2,782 pieces.
Q: Can I use an active product substitute in place of the obsolete 74ACTQ240SJ? A: Yes. Active product substitutes (MC74ACT240DWR2G, CD74ACT240M96, SN74ACT240DWR, SN74ACT240NSR) meet all electrical and functional requirements and provide improved long-term availability and support.
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