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74ABT240CSJ Equivalent & Substitute Parts
Part Overview
The 74ABT240CSJ is a Buffer, Inverting logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This component 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 classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 74ABT240CSJ |
| Manufacturer | onsemi |
| Series | 74ABT |
| Logic Type | Buffer, Inverting |
| Number of Elements | 2 |
| Number of Bits per Element | 4 |
| Output Type | 3-State |
| Current - Output High, Low | 32mA, 64mA |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount |
| Package / Case | 20-SOIC (0.209", 5.30mm Width) |
| Product Status | Obsolete |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the 74ABT240CSJ is determined by the following critical parameters:
Functional Parameters: Logic type (Buffer, Inverting), number of elements (2), bits per element (4), and output type (3-State) must remain identical across all substitutes.
Electrical Parameters: Supply voltage range (4.5V ~ 5.5V) and operating temperature range (-40°C ~ 85°C) must be maintained. Output current specifications (32mA high, 64mA low) define the primary electrical compatibility class.
Physical Parameters: Surface mount mounting type is required. Package variants (20-SOIC and 20-SO) are mechanically compatible within the same footprint family.
Compliance Parameters: Moisture sensitivity level (MSL 1) and REACH status must be equivalent or superior.
Substitute parts are grouped into two categories:
Direct Substitutes (Identical Output Current): Parts matching 32mA/64mA output current specification, including SN74ABT240ADW, SN74ABT240ADWR, and SN74ABT240ANSR from Texas Instruments.
Parametric Equivalents (Reduced Output Current): Parts with 32mA/12mA output current specification, including SN74ABT2240ADW, SN74ABT2240ADWR, and SN74ABT2240ANSR. These maintain functional compatibility but with different current drive characteristics.
Parameter Comparison
| Parameter | 74ABT240CSJ (onsemi) | SN74ABT240ADW (TI) | SN74ABT240ADWR (TI) | SN74ABT240ANSR (TI) | SN74ABT2240ADW (TI) | SN74ABT2240ADWR (TI) | SN74ABT2240ANSR (TI) | SN74ABT240ANS (TI) |
|---|---|---|---|---|---|---|---|---|
| Manufacturer | onsemi | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Logic Type | Buffer, Inverting | Buffer, Inverting | Buffer, Inverting | Buffer, Inverting | Buffer, Inverting | Buffer, Inverting | Buffer, Inverting | Buffer, Inverting |
| Number of Elements | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Number of Bits per Element | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Output Type | 3-State | 3-State | 3-State | 3-State | 3-State | 3-State | 3-State | 3-State |
| Current - Output High, Low | 32mA, 64mA | 32mA, 64mA | 32mA, 64mA | 32mA, 64mA | 32mA, 12mA | 32mA, 12mA | 32mA, 12mA | 32mA, 64mA |
| 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 | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | 20-SOIC (0.209", 5.30mm) | 20-SOIC (0.295", 7.50mm) | 20-SOIC (0.295", 7.50mm) | 20-SOIC (0.209", 5.30mm) | 20-SOIC (0.295", 7.50mm) | 20-SOIC (0.295", 7.50mm) | 20-SOIC (0.209", 5.30mm) | 20-SOIC (0.209", 5.30mm) |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active |
| RoHS Status | Not specified | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
Primary Substitutes (Recommended for Direct Replacement):
SN74ABT240ADWR and SN74ABT240ANS are the preferred substitutes. Both are manufactured by Texas Instruments with active product status and ROHS3 compliance. SN74ABT240ADWR maintains identical output current specifications (32mA/64mA) and is available in high inventory (12,575 pcs). SN74ABT240ANS provides the same electrical and functional characteristics with 766 pcs in stock.
Secondary Substitutes (Package-Variant Options):
SN74ABT240ADW offers identical electrical performance with tube packaging and 2,470 pcs inventory availability. SN74ABT2240ADWR and SN74ABT2240ADW provide functional equivalence with reduced output low current (12mA vs. 64mA), suitable for applications where lower current drive is acceptable.
Compliance Advantage:
All Texas Instruments substitutes carry ROHS3 compliance certification, exceeding the compliance status of the obsolete onsemi part. All substitutes maintain MSL 1 rating and REACH unaffected status.
Frequently Asked Questions (FAQ)
Q: Can SN74ABT2240 series parts replace the 74ABT240CSJ directly?
A: SN74ABT2240 parts are parametric equivalents with reduced output low current (12mA vs. 64mA). They maintain functional compatibility for logic buffering and inversion but differ in current drive capability. Selection depends on circuit load requirements.
Q: What is the difference between 20-SOIC (0.209", 5.30mm) and 20-SOIC (0.295", 7.50mm) packages?
A: Both are 20-pin SOIC packages with different body widths. The 0.209" width is a narrower variant. PCB footprint compatibility must be verified before substitution. Parts with matching package dimensions (SN74ABT240ANSR, SN74ABT2240ANSR, SN74ABT240ANS) maintain identical footprints to the original 74ABT240CSJ.
Q: Why is the 74ABT240CSJ marked as obsolete?
A: Obsolescence indicates the part is no longer manufactured by onsemi. Active substitutes from Texas Instruments provide equivalent functionality with ongoing manufacturing support and improved compliance certifications.
Q: Are all substitutes RoHS compliant?
A: All Texas Instruments substitutes listed carry ROHS3 compliance. The original onsemi part does not specify RoHS status.
Q: What inventory levels are available for each substitute?
A: SN74ABT240ADWR has the highest inventory at 12,575 pcs. SN74ABT240ANSR provides 16,100 pcs. SN74ABT2240ADWR offers 5,400 pcs. Other variants range from 766 to 2,470 pcs.
Q: Can packaging type affect circuit performance?
A: Packaging type (Tube, Tape & Reel, Cut Tape) affects handling and assembly processes but does not alter electrical performance. Package case dimensions must match PCB footprint requirements.
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