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PI74STX1G126CX Equivalent & Substitute Parts
Part Overview
The PI74STX1G126CX is a non-inverting buffer logic IC manufactured by Diodes Incorporated, housed in a 5-TSSOP (SC-70-5) package. This component functions as a single-element, single-bit buffer with 3-state output capability, operating across a supply voltage range of 1.65V to 5.5V. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Logic Type | Buffer, Non-Inverting |
| Number of Elements | 1 |
| Number of Bits per Element | 1 |
| Output Type | 3-State |
| Current - Output High, Low | 32mA, 32mA |
| Voltage - Supply | 1.65V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 5-TSSOP, SC-70-5, SOT-353 |
| Mounting Type | Surface Mount |
| RoHS Status | RoHS non-compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the PI74STX1G126CX is determined by the following critical parameters:
- Logic Function: Buffer, Non-Inverting with 3-State output capability
- Electrical Specifications: Supply voltage range 1.65V ~ 5.5V, output current capability 32mA (high and low)
- Package Compatibility: 5-TSSOP, SC-70-5, or SOT-353 footprint for direct PCB replacement
- Operating Temperature Range: Minimum -40°C to 85°C or higher
- Functional Elements: Single element, single bit per element configuration
Substitute parts must maintain compatibility across these parameters. Parts with identical electrical characteristics and compatible package footprints are considered direct substitutes. Parts with different package types (SOT-23-5, SC-74A) are functional equivalents but require PCB layout modification.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Logic Type | Output Current (mA) | Supply Voltage | Operating Temp (°C) | Package / Case | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|
| PI74STX1G126CX | Diodes Incorporated | Buffer, Non-Inverting | 32, 32 | 1.65V ~ 5.5V | -40 ~ 85 | 5-TSSOP, SC-70-5, SOT-353 | Obsolete | RoHS non-compliant |
| 74LVC1G126SE-7 | Diodes Incorporated | Buffer, Non-Inverting | 32, 32 | 1.65V ~ 5.5V | -40 ~ 125 | 5-TSSOP, SC-70-5, SOT-353 | Active | ROHS3 Compliant |
| 74LVC1G126GW,125 | Nexperia USA Inc. | Buffer, Non-Inverting | 32, 32 | 1.65V ~ 5.5V | -40 ~ 125 | 5-TSSOP, SC-70-5, SOT-353 | Active | ROHS3 Compliant |
| NL17SZ126DFT2G | onsemi | Buffer, Non-Inverting | 32, 32 | 1.65V ~ 5.5V | -40 ~ 125 | 5-TSSOP, SC-70-5, SOT-353 | Active | ROHS3 Compliant |
| SN74LVC1G126DCKR | Texas Instruments | Buffer, Non-Inverting | 32, 32 | 1.65V ~ 5.5V | -40 ~ 125 | 5-TSSOP, SC-70-5, SOT-353 | Active | ROHS3 Compliant |
| SN74AHC1G126DCKR | Texas Instruments | Buffer, Non-Inverting | 8, 8 | 2V ~ 5.5V | -40 ~ 125 | 5-TSSOP, SC-70-5, SOT-353 | Active | ROHS3 Compliant |
| 1P1G126QDBVRQ1 | Texas Instruments | Buffer, Non-Inverting | 24, 24 | 1.65V ~ 5.5V | -40 ~ 125 | SC-74A, SOT-753 | Active | ROHS3 Compliant |
| SN74LVC1G126DBVT | Texas Instruments | Buffer, Non-Inverting | 32, 32 | 1.65V ~ 5.5V | -40 ~ 125 | SC-74A, SOT-753 | Active | ROHS3 Compliant |
| 74LVC1G126GV,125 | Nexperia USA Inc. | Buffer, Non-Inverting | 32, 32 | 1.65V ~ 5.5V | -40 ~ 125 | SC-74A, SOT-753 | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Pin-Compatible Substitutes (Same Package: 5-TSSOP/SC-70-5/SOT-353)
The following parts provide direct PCB replacement capability with identical or superior electrical performance:
- 74LVC1G126SE-7 (Diodes Incorporated): Active product with extended operating temperature range (-40°C to 125°C) and ROHS3 compliance. Identical electrical specifications and package footprint.
- 74LVC1G126GW,125 (Nexperia USA Inc.): Active product with 32mA output current, extended temperature range, and ROHS3 compliance. Identical package and electrical characteristics.
- NL17SZ126DFT2G (onsemi): Active product with matching electrical specifications, extended temperature range, and ROHS3 compliance.
- SN74LVC1G126DCKR (Texas Instruments): Active product with identical electrical specifications, extended temperature range, and ROHS3 compliance. High inventory availability.
Functional Equivalents with Package Variation (SOT-23-5/SC-74A)
These parts maintain identical electrical function but require PCB layout modification:
- SN74LVC1G126DBVT (Texas Instruments): Active product with 32mA output current and extended temperature range. SOT-23-5 package requires footprint redesign.
- 1P1G126QDBVRQ1 (Texas Instruments): Active automotive-grade product (AEC-Q100 qualified) with 24mA output current. SOT-23-5 package requires footprint redesign.
- 74LVC1G126GV,125 (Nexperia USA Inc.): Active product with 32mA output current. SC-74A package requires footprint redesign.
Limited Substitution (Reduced Output Current)
- SN74AHC1G126DCKR (Texas Instruments): Active product with reduced output current (8mA vs. 32mA) and minimum supply voltage of 2V. Suitable only for applications with lower current requirements. Same 5-TSSOP package.
All substitute parts listed maintain the core functional specification: single-element, single-bit non-inverting buffer with 3-state output. Product status and RoHS compliance have been verified for active components.
Frequently Asked Questions (FAQ)
Q: Can I use SN74AHC1G126DCKR as a direct replacement for PI74STX1G126CX?
A: The SN74AHC1G126DCKR shares the same 5-TSSOP package and logic function. However, it provides only 8mA output current compared to the original 32mA specification. Use this substitute only if your circuit design requires maximum 8mA output current and operates within the 2V to 5.5V supply range.
Q: What is the difference between 5-TSSOP and SOT-23-5 packages?
A: Both are surface-mount packages with 5 pins, but they have different physical footprints and pin spacing. 5-TSSOP (SC-70-5/SOT-353) has a smaller footprint than SOT-23-5 (SC-74A/SOT-753). Parts in different packages require PCB layout modification and cannot be used in the same footprint without redesign.
Q: Are all listed substitutes RoHS compliant?
A: The original PI74STX1G126CX is RoHS non-compliant. All active substitute parts listed (74LVC1G126SE-7, 74LVC1G126GW,125, NL17SZ126DFT2G, SN74LVC1G126DCKR, SN74AHC1G126DCKR, and others) are ROHS3 compliant, meeting current environmental regulations.
Q: Which substitute offers the best inventory availability?
A: SN74LVC1G126DBVT (Texas Instruments) shows the highest inventory at 298,933 pieces. SN74LVC1G126DCKR (Texas Instruments) provides 104,300 pieces in the same 5-TSSOP package as the original part.
Q: Can I use the automotive-grade 1P1G126QDBVRQ1 in non-automotive applications?
A: Yes. The 1P1G126QDBVRQ1 is AEC-Q100 qualified for automotive use but functions as a standard non-inverting buffer in any application. Note that it provides 24mA output current (vs. 32mA) and uses a different SOT-23-5 package requiring PCB redesign.
Q: What is the operating temperature difference between the original part and substitutes?
A: The PI74STX1G126CX operates from -40°C to 85°C. All active substitutes extend the upper limit to 125°C, providing a wider operating range suitable for industrial and automotive environments.
Q: Are there substitutes with identical output current specifications?
A: Yes. The 74LVC1G126SE-7, 74LVC1G126GW,125, NL17SZ126DFT2G, and SN74LVC1G126DCKR all provide 32mA output current (high and low), matching the original PI74STX1G126CX specification.
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