PI74STX1GU04CEX Equivalent & Substitute Parts

Part Overview

The PI74STX1GU04CEX is a single-channel inverter logic IC manufactured by Diodes Incorporated in SC-70-5 packaging. This part operates across a supply voltage range of 1.65V to 5.5V with a maximum quiescent current of 2 µA and propagation delay of 3.4ns at 5V with 50pF load. The product is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Logic Type	Inverter
Number of Circuits	1
Number of Inputs	1
Voltage - Supply	1.65V ~ 5.5V
Current - Quiescent (Max)	2 µA
Current - Output High, Low	16mA, 16mA
Max Propagation Delay @ 5V, 50pF	3.4ns
Operating Temperature	-40°C ~ 85°C
Package / Case	5-TSSOP, SC-70-5, SOT-353
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the PI74STX1GU04CEX is determined by the following critical parameters:

Logic Function: Single-channel inverter with 1 input
Supply Voltage Range: 1.65V ~ 5.5V compatibility required
Package Compatibility: SC-70-5, 5-TSSOP, or SOT-353 footprints
Output Drive Capability: Minimum 16mA output current (high and low)
Propagation Delay: Maximum 5ns at 5V with 50pF load acceptable
Operating Temperature: -40°C to 85°C minimum
Compliance: ROHS3 compliant, MSL 1

Substitute parts are grouped by package type and performance characteristics. All listed substitutes maintain the core inverter function and voltage supply range. Parts with higher quiescent current (10 µA) or extended temperature ranges (-40°C to 125°C) are functionally compatible but represent different performance profiles. Package variants (SOT-25, SOT-23-5) require PCB layout verification for mechanical fit.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Voltage - Supply	Current - Quiescent (Max)	Current - Output High, Low	Max Propagation Delay @ 5V, 50pF	Operating Temperature	Package	Product Status
PI74STX1GU04CEX	Diodes Incorporated	Inverter	1.65V ~ 5.5V	2 µA	16mA, 16mA	3.4ns	-40°C ~ 85°C	SC-70-5	Obsolete
74LVC1G04SE-7	Diodes Incorporated	Inverter	1.65V ~ 5.5V	10 µA	32mA, 32mA	5ns	-40°C ~ 125°C	SOT-353	Active
74LVC1G04W5-7	Diodes Incorporated	Inverter	1.65V ~ 5.5V	10 µA	32mA, 32mA	5ns	-40°C ~ 125°C	SOT-25	Active
74LVC1GU04DCKRG4	Texas Instruments	Inverter	1.65V ~ 5.5V	10 µA	32mA, 32mA	4.6ns	-40°C ~ 125°C	SC-70-5	Discontinued at DiGi Electronics
74LVC1GU04DCKTG4	Texas Instruments	Inverter	1.65V ~ 5.5V	10 µA	32mA, 32mA	4.6ns	-40°C ~ 125°C	SC-70-5	Discontinued at DiGi Electronics
74LVC1GU04GW-Q100H	Nexperia USA Inc.	Inverter	1.65V ~ 5.5V	4 µA	32mA, 32mA	4ns	-40°C ~ 125°C	5-TSSOP	Active
NC7SZU04P5X	onsemi	Inverter	1.65V ~ 5.5V	2 µA	16mA, 16mA	5ns	-40°C ~ 85°C	SC-70-5	Active
NL17SZU04DFT2G	onsemi	Inverter	1.65V ~ 5.5V	1 µA	16mA, 16mA	5ns	-40°C ~ 85°C	SC-88A (SC-70-5/SOT-353)	Active
SN74LVC1GU04DBVR	Texas Instruments	Inverter	1.65V ~ 5.5V	10 µA	32mA, 32mA	4.6ns	-40°C ~ 125°C	SOT-23-5	Active
SN74LVC1GU04DBVT	Texas Instruments	Inverter	1.65V ~ 5.5V	10 µA	32mA, 32mA	4.6ns	-40°C ~ 125°C	SOT-23-5	Active
SN74LVC1GU04DCKR	Texas Instruments	Inverter	1.65V ~ 5.5V	10 µA	32mA, 32mA	4.6ns	-40°C ~ 125°C	SC-70-5	Active

Engineering Selection Recommendations

Primary Recommendation - Same Package (SC-70-5):

NC7SZU04P5X (onsemi) is the closest functional equivalent. It maintains identical quiescent current (2 µA), output drive (16mA), and operating temperature range (-40°C to 85°C) as the original PI74STX1GU04CEX. The SC-70-5 package ensures direct PCB compatibility without layout modifications. Product status is active with high inventory availability (105,300 pcs).

Alternative - Enhanced Performance (SC-70-5):

SN74LVC1GU04DCKR (Texas Instruments) provides the same SC-70-5 package with improved propagation delay (4.6ns vs 3.4ns) and higher output drive capability (32mA vs 16mA). Extended operating temperature range (-40°C to 125°C) and active product status support long-term availability. Quiescent current increase to 10 µA is acceptable for most applications.

Alternative - Automotive Grade:

74LVC1GU04GW-Q100H (Nexperia USA Inc.) offers AEC-Q100 automotive qualification with 5-TSSOP package. Lowest quiescent current among active substitutes (4 µA) and fast propagation delay (4ns). Requires PCB footprint verification for 5-TSSOP compatibility.

Alternative - Ultra-Low Power:

NL17SZU04DFT2G (onsemi) delivers the lowest quiescent current (1 µA) with SC-88A package (SC-70-5/SOT-353 compatible). Highest inventory availability (148,500 pcs) ensures procurement reliability. Suitable for battery-powered and low-power applications.

Package Variants:

74LVC1G04SE-7 (Diodes Incorporated, SOT-353) and 74LVC1G04W5-7 (Diodes Incorporated, SOT-25) are functionally equivalent but require PCB layout changes. Both are active products from the same manufacturer as the original part.

All recommended substitutes maintain ROHS3 compliance and MSL 1 rating. Selection should prioritize active product status and inventory availability for production continuity.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher quiescent current?

A: Yes. The PI74STX1GU04CEX specifies 2 µA maximum quiescent current. Substitutes with 4 µA, 10 µA, or 1 µA are functionally compatible. Higher quiescent current increases standby power consumption but does not affect logic operation. Verify total system power budget for your application.

Q: Are all substitute parts pin-compatible?

A: Pin compatibility depends on package type. SC-70-5, 5-TSSOP, and SOT-353 packages share the same pinout and are mechanically interchangeable on the PCB. SOT-25 and SOT-23-5 packages have different pinouts and require PCB layout modifications. Verify package designation before substitution.

Q: What is the difference between SC-70-5 and SOT-353?

A: SC-70-5 and SOT-353 are equivalent package designations for the same 5-pin surface-mount package. Both terms refer to identical physical dimensions and pin configurations. Parts specified as either package type are mechanically and electrically interchangeable.

Q: Can I substitute with a part rated for -40°C to 125°C instead of -40°C to 85°C?

A: Yes. Extended temperature range (-40°C to 125°C) is a superset of the original specification (-40°C to 85°C). The part will operate correctly within the original temperature range. Extended rating provides additional design margin and may support future applications with higher temperature requirements.

Q: Why do some substitutes have higher output drive current (32mA vs 16mA)?

A: Output drive capability is determined by the logic family. The original PI74STX1GU04CEX uses the 74STX family with 16mA drive. Substitutes from the 74LVC family provide 32mA drive, offering improved fanout capability and faster edge rates into capacitive loads. Higher drive current is backward compatible and improves performance.

Q: Is the 74LVC1GU04GW-Q100H suitable for automotive applications?

A: Yes. The 74LVC1GU04GW-Q100H carries AEC-Q100 automotive qualification, indicating compliance with automotive reliability and environmental standards. This part is specifically qualified for automotive use. Non-qualified substitutes may not meet automotive procurement requirements.

Q: What is the difference between cut tape and tape & reel packaging?

A: Cut tape (CT) and tape & reel (TR) are packaging formats for surface-mount components. Cut tape provides individual strips for manual assembly or small-volume production. Tape & reel provides continuous reels for automated pick-and-place equipment. Both formats contain identical components; selection depends on assembly process requirements.

Q: Can I use NL17SZU04DFT2G as a direct replacement?

A: Yes. The NL17SZU04DFT2G is a direct functional replacement with SC-88A package (SC-70-5/SOT-353 compatible). It offers the lowest quiescent current (1 µA) and highest inventory availability. No PCB modifications are required for SC-70-5 footprints.

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