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SN74AHCT126QDREP Equivalent & Substitute Parts
Part Overview
The SN74AHCT126QDREP is a non-inverting buffer logic integrated circuit manufactured by Texas Instruments, designed for 4.5V to 5.5V supply voltage applications. This 14-SOIC surface mount device provides four independent buffer elements with 3-state output capability, each handling 1 bit per element with 8mA output current capacity. The part is Active status and ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are necessary when addressing supply chain constraints, lead time requirements, automotive grade specifications, or alternative manufacturer sourcing while maintaining electrical and mechanical compatibility.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Logic Type | Buffer, Non-Inverting |
| Number of Elements | 4 |
| Number of Bits per Element | 1 |
| Output Type | 3-State |
| Current - Output High, Low | 8mA, 8mA |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C (TA) |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the SN74AHCT126QDREP is determined by strict equivalence across the following critical parameters: Logic Type (Buffer, Non-Inverting), Number of Elements (4), Number of Bits per Element (1), Output Type (3-State), Current ratings (8mA output high and low), Supply Voltage range (4.5V ~ 5.5V), Package type (14-SOIC), and Mounting Type (Surface Mount). Parts meeting these criteria are classified as parametric equivalents regardless of manufacturer or base product number variation. Operating temperature range may extend beyond the original specification without affecting substitution eligibility. Automotive grade qualification (AEC-Q100) and packaging code variations (TR designation) do not preclude substitution but indicate enhanced qualification or alternative distribution formats.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Base Product Number | Logic Type | Elements | Output Type | Current (mA) | Supply Voltage | Operating Temp (°C) | Package | Grade | Inventory (Pcs) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| SN74AHCT126QDREP | Texas Instruments | 74AHCT126 | Buffer, Non-Inverting | 4 | 3-State | 8, 8 | 4.5V ~ 5.5V | -40 ~ 125 | 14-SOIC | Standard | 845 |
| SN74AHCT125QDRG4Q1 | Texas Instruments | 74AHCT125 | Buffer, Non-Inverting | 4 | 3-State | 8, 8 | 4.5V ~ 5.5V | -40 ~ 125 | 14-SOIC | Automotive | 3371 |
| SN74AHCT125QDRQ1 | Texas Instruments | 74AHCT125 | Buffer, Non-Inverting | 4 | 3-State | 8, 8 | 4.5V ~ 5.5V | -40 ~ 125 | 14-SOIC | Automotive | 3315 |
| SN74AHCT126DR | Texas Instruments | 74AHCT126 | Buffer, Non-Inverting | 4 | 3-State | 8, 8 | 4.5V ~ 5.5V | -40 ~ 125 | 14-SOIC | Standard | 5191 |
| SN74AHCT126QDRG4Q1 | Texas Instruments | 74AHCT126 | Buffer, Non-Inverting | 4 | 3-State | 8, 8 | 4.5V ~ 5.5V | -40 ~ 125 | 14-SOIC | Automotive | 3337 |
| SN74AHCT126QDRQ1 | Texas Instruments | 74AHCT126 | Buffer, Non-Inverting | 4 | 3-State | 8, 8 | 4.5V ~ 5.5V | -40 ~ 125 | 14-SOIC | Automotive | 5881 |
| MC74VHCT126ADR2G | onsemi | 74VHCT126 | Buffer, Non-Inverting | 4 | 3-State | 8, 8 | 4.5V ~ 5.5V | -40 ~ 85 | 14-SOIC | Standard | 1135 |
| 74AHCT125D,118 | Nexperia USA Inc. | 74AHCT125 | Buffer, Non-Inverting | 4 | 3-State | 8, 8 | 4.5V ~ 5.5V | -40 ~ 125 | 14-SOIC | Standard | 4944 |
| 74AHCT125S14-13 | Diodes Incorporated | 74AHCT125 | Buffer, Non-Inverting | 4 | 3-State | 8, 8 | 4.5V ~ 5.5V | -40 ~ 125 | 14-SOIC | Standard | 3625 |
| 74AHCT126D-Q100,11 | Nexperia USA Inc. | 74AHCT126 | Buffer, Non-Inverting | 4 | 3-State | 8, 8 | 4.5V ~ 5.5V | -40 ~ 125 | 14-SOIC | Automotive | 695 |
| 74AHCT126S14-13 | Diodes Incorporated | 74AHCT126 | Buffer, Non-Inverting | 4 | 3-State | 8, 8 | 4.5V ~ 5.5V | -40 ~ 125 | 14-SOIC | Standard | 1053 |
Engineering Selection Recommendations
All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring long-term availability and environmental regulatory alignment. Texas Instruments variants (SN74AHCT126QDRG4Q1, SN74AHCT126QDRQ1) with automotive grade qualification meet AEC-Q100 standards for applications requiring enhanced reliability screening. The SN74AHCT126DR offers equivalent functionality with higher inventory availability (5191 pcs) compared to the original part (845 pcs). Nexperia USA Inc. and Diodes Incorporated alternatives provide multi-source options with comparable inventory levels. The onsemi MC74VHCT126ADR2G operates within a reduced temperature range (-40°C to 85°C) and should be selected only when application requirements do not exceed this thermal specification. All parts share identical electrical performance characteristics and 14-SOIC package footprint, enabling direct substitution in PCB designs without layout modification.
Frequently Asked Questions (FAQ)
Q: Can SN74AHCT125 variants substitute for SN74AHCT126 variants? A: Yes. Both the 74AHCT125 and 74AHCT126 base product numbers meet all critical substitution parameters: 4-element non-inverting buffers with 3-state output, 8mA current rating, 4.5V to 5.5V supply voltage, and 14-SOIC package. The functional difference between these base numbers does not affect substitution eligibility based on the provided electrical and mechanical specifications.
Q: What is the difference between standard grade and automotive grade parts? A: Automotive grade parts (identified by AEC-Q100 qualification) undergo enhanced reliability screening and qualification testing. Standard grade parts meet the same electrical specifications but without automotive-specific qualification. Selection depends on application requirements; automotive applications may mandate AEC-Q100 certification.
Q: Does the operating temperature range affect substitution? A: The MC74VHCT126ADR2G operates from -40°C to 85°C, compared to -40°C to 125°C for other substitutes. This part is suitable only when application maximum operating temperature does not exceed 85°C. All other substitutes support the full -40°C to 125°C range.
Q: Are there package differences between substitute parts? A: All substitute parts use the 14-SOIC (0.154", 3.90mm Width) surface mount package. Supplier device package designations (14-SOIC, 14-SO) refer to the same physical package footprint and are interchangeable for PCB assembly.
Q: Which substitute offers the best inventory availability? A: SN74AHCT126QDRQ1 (5881 pcs) and SN74AHCT126DR (5191 pcs) provide the highest inventory levels among Texas Instruments variants. Nexperia USA Inc. 74AHCT125D,118 offers 4944 pcs for alternative sourcing.
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