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74ABT126CSCX Equivalent & Substitute Parts
Part Overview
The 74ABT126CSCX is a non-inverting buffer logic IC manufactured by onsemi, featuring 4 elements with 1 bit per element and 3-state output capability. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
The 74ABT126 series operates within a 4.5V to 5.5V supply voltage range and is rated for -40°C to 85°C operating temperature. Output drive capability is specified at 32mA high and 64mA low, suitable for standard TTL-compatible logic applications requiring buffering with output control.
Substiute Parts
Key Parameters
| Parameter | Specification |
|---|---|
| Logic Type | Buffer, Non-Inverting |
| Number of Elements | 4 |
| Number of Bits per Element | 1 |
| 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 | 14-SOIC (0.154", 3.90mm Width) |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the 74ABT126CSCX is determined by the following critical parameters:
- Logic Type: Buffer, Non-Inverting
- Number of Elements: 4
- Number of Bits per Element: 1
- 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: 14-SOIC or 14-SO (0.154" to 0.209" width tolerance)
Substitute parts are grouped into two categories:
Direct Manufacturer Equivalents (Same Base Product Number 74ABT126): Parts maintaining identical functional specifications and package footprint compatibility, differing only in packaging format (Cut Tape, Tube, or Tape & Reel).
Parametric Equivalents (Base Product Number 74ABT125 or 74ABT126 variants): Parts meeting all electrical and functional specifications with potential package or manufacturer variations. The 74ABT125 series shares identical electrical characteristics and pin configuration with the 74ABT126, enabling functional interchangeability.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Logic Type | Elements | Output Type | Current (High/Low) | Supply Voltage | Temp Range | Package | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|
| 74ABT126CSCX | onsemi | Obsolete | Buffer, Non-Inverting | 4 x 1-bit | 3-State | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 14-SOIC (0.154") | Not Specified |
| SN74ABT126DR | Texas Instruments | Active | Buffer, Non-Inverting | 4 x 1-bit | 3-State | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 14-SOIC (0.154") | ROHS3 Compliant |
| SN74ABT126D | Texas Instruments | Active | Buffer, Non-Inverting | 4 x 1-bit | 3-State | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 14-SOIC (0.154") | ROHS3 Compliant |
| SN74ABT126NSR | Texas Instruments | Active | Buffer, Non-Inverting | 4 x 1-bit | 3-State | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 14-SO (0.209") | ROHS3 Compliant |
| 74ABT125D,623 | NXP Semiconductors | Active | Buffer, Non-Inverting | 4 x 1-bit | 3-State | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 14-SO (0.154") | Not Specified |
| 74ABT125D/AUJ | NXP USA Inc. | Active | Buffer, Non-Inverting | 4 x 1-bit | 3-State | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 14-SO (0.154") | ROHS3 Compliant |
| 74ABT126D,623 | Nexperia USA Inc. | Active | Buffer, Non-Inverting | 4 x 1-bit | 3-State | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 14-SO (0.154") | ROHS3 Compliant |
| 74ABT126D/AUJ | NXP USA Inc. | Active | Buffer, Non-Inverting | 4 x 1-bit | 3-State | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 14-SO (0.154") | ROHS3 Compliant |
| SN74ABT125DR | Texas Instruments | Active | Buffer, Non-Inverting | 4 x 1-bit | 3-State | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 14-SOIC (0.154") | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Recommendation: SN74ABT126DR (Texas Instruments) or SN74ABT126D (Texas Instruments)
Both parts are direct functional equivalents with active product status and ROHS3 compliance. SN74ABT126DR is supplied in Cut Tape & Digi-Reel format, while SN74ABT126D is supplied in Tube format. Both maintain identical electrical specifications and 14-SOIC package footprint (0.154" width) as the original 74ABT126CSCX.
Secondary Recommendation: SN74ABT125DR (Texas Instruments)
This part provides parametric equivalence with the 74ABT126 series, sharing identical electrical characteristics and pin configuration. Active product status and ROHS3 compliance ensure long-term availability. The 14-SOIC package (0.154" width) maintains footprint compatibility.
Alternative Recommendation: 74ABT126D,623 (Nexperia USA Inc.) or 74ABT125D,623 (NXP Semiconductors)
These parts meet all electrical and functional specifications with active product status. Package designation as 14-SO (0.154" width) maintains mechanical compatibility with standard 14-SOIC footprints. ROHS3 compliance is confirmed for the Nexperia variant.
Package Consideration: SN74ABT126NSR (Texas Instruments) provides functional equivalence with a wider 14-SO package (0.209" width). This part is suitable only if PCB layout accommodates the increased package width.
Frequently Asked Questions (FAQ)
Q: Can I use SN74ABT125DR as a direct replacement for 74ABT126CSCX?
A: Yes. The SN74ABT125DR meets all electrical specifications (4.5V ~ 5.5V supply, 32mA/64mA output drive, -40°C ~ 85°C operating range) and maintains identical pin configuration and 14-SOIC package footprint. The 74ABT125 and 74ABT126 series are functionally interchangeable for this application.
Q: What is the difference between 14-SOIC and 14-SO packages?
A: Both designations refer to 14-pin small-outline integrated circuit packages. The primary difference is package width: 14-SOIC is typically 0.154" (3.90mm) while 14-SO can range from 0.154" to 0.209" (5.30mm). Verify PCB layout compatibility before selecting parts with wider package specifications.
Q: Are all substitute parts ROHS3 compliant?
A: Most active substitute parts carry ROHS3 compliance certification. The original 74ABT126CSCX (onsemi, obsolete) does not specify RoHS status. All Texas Instruments and Nexperia variants listed are ROHS3 compliant. Verify compliance requirements for your specific application before final part selection.
Q: Why is the 74ABT126CSCX listed as obsolete?
A: The original onsemi part has reached end-of-life status. Active equivalent parts from Texas Instruments, NXP, and Nexperia provide continued design support and procurement availability with identical or superior specifications.
Q: Can I substitute 74ABT126D,623 for 74ABT126CSCX in existing designs?
A: Yes. The 74ABT126D,623 (Nexperia) maintains identical electrical specifications and 14-SO package footprint (0.154" width) compatible with standard 14-SOIC layouts. Active product status ensures long-term availability.
Q: What packaging formats are available for substitute parts?
A: Substitute parts are available in multiple packaging formats: Cut Tape & Digi-Reel (SN74ABT126DR), Tube (SN74ABT126D), Tape & Reel (SN74ABT126NSR, 74ABT126D,623), and Bulk (74ABT125D,623). Select packaging format based on procurement volume and assembly requirements.
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