PI74ST1G32CEX Equivalent & Substitute Parts

Part Overview

The PI74ST1G32CEX is a single-channel, 2-input OR gate logic IC manufactured by Diodes Incorporated in SC-70-5 packaging. This part operates across a 1.8V to 3.6V supply voltage range with a maximum propagation delay of 3.8ns at 3.3V with 50pF load. The product is currently obsolete, making equivalent substitute parts necessary for ongoing design support and component sourcing.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI74ST1G32CEX
Manufacturer	Diodes Incorporated
Logic Type	OR Gate
Number of Circuits	1
Number of Inputs	2
Voltage - Supply	1.8V ~ 3.6V
Current - Quiescent (Max)	2 µA
Current - Output High, Low	24mA, 24mA
Max Propagation Delay @ V, Max CL	3.8ns @ 3.3V, 50pF
Operating Temperature	-40°C ~ 85°C
Package / Case	5-TSSOP, SC-70-5, SOT-353
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the PI74ST1G32CEX is determined by the following core parameters:

Logic function: Single-channel, 2-input OR gate
Package compatibility: SC-70-5 (5-TSSOP, SOT-353) or functionally equivalent packages
Supply voltage range: Must support operation within or encompass the 1.8V to 3.6V range
Output drive capability: Minimum 24mA output current (high and low)
Operating temperature range: -40°C to 85°C
RoHS3 compliance and REACH unaffected status

Substitute parts are grouped into two categories based on package type: SC-70-5 package variants and SOT-23-5 package variants. Both package types are electrically compatible with the original part when mounted appropriately in the circuit design.

Parameter Comparison

Parameter	PI74ST1G32CEX (Main)	NC7SV32P5X	SN74AUC1G32DCKR	SN74AUC1G32DBVR	SN74AUC1G32DBVRE4
Manufacturer	Diodes Incorporated	Fairchild Semiconductor	Texas Instruments	Texas Instruments	Texas Instruments
Logic Type	OR Gate	OR Gate	OR Gate	OR Gate	OR Gate
Number of Circuits	1	1	1	1	1
Number of Inputs	2	2	2	2	2
Voltage - Supply	1.8V ~ 3.6V	0.9V ~ 3.6V	0.8V ~ 2.7V	0.8V ~ 2.7V	0.8V ~ 2.7V
Current - Quiescent (Max)	2 µA	900 nA	10 µA	10 µA	10 µA
Current - Output High, Low	24mA, 24mA	24mA, 24mA	9mA, 9mA	9mA, 9mA	9mA, 9mA
Max Propagation Delay @ V, Max CL	3.8ns @ 3.3V, 50pF	3.3ns @ 3V, 30pF	2.1ns @ 2.5V, 30pF	2.1ns @ 2.5V, 30pF	2.1ns @ 2.5V, 30pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	5-TSSOP, SC-70-5, SOT-353	5-TSSOP, SC-70-5, SOT-353	5-TSSOP, SC-70-5, SOT-353	SC-74A, SOT-753	SC-74A, SOT-753
Product Status	Obsolete	Active	Active	Active	Discontinued at DiGi Electronics
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SC-70-5 Package Compatibility (Direct Pin-Compatible Substitutes)

NC7SV32P5X (Fairchild Semiconductor) and SN74AUC1G32DCKR (Texas Instruments) maintain the SC-70-5 package footprint identical to the PI74ST1G32CEX. Both parts are ROHS3 compliant and REACH unaffected. NC7SV32P5X is currently active in production with 10,400 units in stock. SN74AUC1G32DCKR is also active with 4,850 units available. Both support the full -40°C to 85°C operating temperature range.

SOT-23-5 Package Variants (Functional Substitutes with Package Change)

SN74AUC1G32DBVR and SN74AUC1G32DBVRE4 (Texas Instruments) provide OR gate functionality in SOT-23-5 packaging. SN74AUC1G32DBVR is active with 4,120 units in stock. SN74AUC1G32DBVRE4 is discontinued at DiGi Electronics with 1,101 units remaining. Both are ROHS3 compliant and REACH unaffected. Circuit board layout modification is required to accommodate the different package footprint.

Product Status Considerations

NC7SV32P5X and SN74AUC1G32DCKR are recommended for new designs due to active production status and adequate inventory levels. SN74AUC1G32DBVRE4 should not be selected for new designs given its discontinued status.

Frequently Asked Questions (FAQ)

Q: Can NC7SV32P5X directly replace PI74ST1G32CEX without circuit modification?

A: Yes. NC7SV32P5X maintains identical SC-70-5 packaging and pin configuration. Both parts support the required -40°C to 85°C operating temperature range and are ROHS3 compliant. No circuit modification is required.

Q: What is the key difference between SN74AUC1G32DCKR and SN74AUC1G32DBVR?

A: Both parts are functionally identical OR gate ICs from Texas Instruments with identical electrical specifications. The primary difference is packaging: SN74AUC1G32DCKR uses SC-70-5 (5-TSSOP) while SN74AUC1G32DBVR uses SOT-23-5 (SC-74A). SN74AUC1G32DCKR is the direct package-compatible substitute for PI74ST1G32CEX.

Q: Are the Texas Instruments 74AUC series parts compatible with the original 1.8V to 3.6V supply range?

A: The SN74AUC1G32 series supports 0.8V to 2.7V supply voltage. This range does not fully encompass the original 1.8V to 3.6V specification. At supply voltages above 2.7V, these parts are not rated. NC7SV32P5X supports 0.9V to 3.6V and is the appropriate choice for applications requiring the full original voltage range.

Q: Why is SN74AUC1G32DBVRE4 listed if it is discontinued?

A: SN74AUC1G32DBVRE4 is documented as a known substitute from the original part's specification. It remains available in limited quantities (1,101 units) for legacy system support only. New designs should not incorporate this part.

Q: What are the output drive capability differences among substitutes?

A: PI74ST1G32CEX and NC7SV32P5X both provide 24mA output drive (high and low). The Texas Instruments 74AUC series (SN74AUC1G32DCKR, SN74AUC1G32DBVR, SN74AUC1G32DBVRE4) provide 9mA output drive. Applications requiring 24mA drive capability must use NC7SV32P5X or verify that 9mA is sufficient for the load.

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