PI74ST1G126CEX Equivalent & Substitute Parts

Part Overview

The PI74ST1G126CEX is a non-inverting buffer logic IC manufactured by Diodes Incorporated, designed for single-element, single-bit applications with 3-state output capability. This component operates across a 1.8V to 3.6V supply voltage range and is housed in a 5-TSSOP (SC-70-5) surface mount package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

PI74ST1G126CEX

Diodes IncorporatedIn Stock: 745PI74ST1G126CEX Datasheet

Current PartRFQ

NC7SV125P5X

Fairchild SemiconductorIn Stock: 35379NC7SV125P5X Datasheet

DirectRFQ

SN74AUC1G126DCKR

Texas InstrumentsIn Stock: 224492SN74AUC1G126DCKR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PI74ST1G126CEX is determined by strict alignment across the following critical parameters:

• Logic function: Buffer, Non-Inverting with 1 element and 1 bit per element
• Output configuration: 3-State output capability
• Package format: 5-TSSOP / SC-70-5 / SOT-353 surface mount
• Operating temperature range: -40°C to 85°C (TA)
• Supply voltage compatibility: Overlap within specified ranges

The identified substitute parts maintain these core functional and physical characteristics. Variations in supply voltage range and output current ratings are noted where they occur, as these represent design trade-offs within the same functional category.

Parameter Comparison

Engineering Selection Recommendations

NC7SV125P5X (Fairchild Semiconductor): This substitute maintains identical output current specifications (24mA, 24mA) and operating temperature range. The supply voltage range extends lower (0.9V minimum) while maintaining the 3.6V upper limit, providing broader operational flexibility. Product status is active with established supply chain availability.

SN74AUC1G126DCKR (Texas Instruments): This manufacturer-recommended alternative operates within a narrower supply voltage window (0.8V ~ 2.7V), which does not fully overlap the original part's 1.8V ~ 3.6V specification. Output current is reduced to 9mA per line. This part carries ROHS3 compliance and unlimited moisture sensitivity rating. Selection of this substitute requires verification that the reduced output current and narrower voltage range are compatible with the target application.

Frequently Asked Questions (FAQ)

Q: Can the NC7SV125P5X directly replace the PI74ST1G126CEX? A: Yes. Both parts share identical logic function, output type, package format, and operating temperature range. Output current specifications are matched at 24mA. The NC7SV125P5X supply voltage range (0.9V ~ 3.6V) encompasses the original specification (1.8V ~ 3.6V), making it a direct functional substitute.

Q: What are the limitations of the SN74AUC1G126DCKR as a substitute? A: The SN74AUC1G126DCKR operates at reduced output current (9mA versus 24mA) and has a narrower supply voltage range (0.8V ~ 2.7V). The upper voltage limit of 2.7V does not reach the original part's 3.6V maximum. Applications requiring 3.6V operation or higher output current must evaluate compatibility before selection.

Q: Are all three parts available in the same package? A: Yes. All three parts use the 5-TSSOP / SC-70-5 / SOT-353 surface mount package, ensuring mechanical and electrical compatibility on the PCB.

Q: What is the significance of the PI74ST1G126CEX being obsolete? A: Obsolete status indicates the part is no longer manufactured by Diodes Incorporated. The identified substitutes (both active products) provide functional continuity for designs currently using or requiring this logic buffer configuration.

Q: How do I determine which substitute is appropriate for my application? A: Evaluate your circuit requirements against the key differing parameters: output current demand and supply voltage range. If your design operates at voltages above 2.7V or requires 24mA output current, the NC7SV125P5X is the appropriate choice. If operation is constrained to 0.8V ~ 2.7V and 9mA output current is sufficient, the SN74AUC1G126DCKR is viable.