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PI74STX1G02CX NOR Gate IC Equivalent & Substitute Parts
Part Overview
The PI74STX1G02CX is a single-channel 2-input NOR gate logic IC manufactured by Diodes Incorporated in SC-70-5 packaging. This part is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The PI74STX1G02CX 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. Equivalent and substitute parts maintain the same logic function, pin configuration, and electrical performance within specified tolerances while offering active product status and improved availability.
Substiute Parts
Key Parameters
| Parameter | PI74STX1G02CX |
|---|---|
| Logic Type | NOR Gate |
| Number of Circuits | 1 |
| Number of Inputs | 2 |
| Voltage - Supply | 1.65V ~ 5.5V |
| Current - Quiescent (Max) | 2 µA |
| Current - Output High, Low | 32mA, 32mA |
| Max Propagation Delay @ 5V, 50pF | 3.4ns |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
| Package / Case | 5-TSSOP, SC-70-5, SOT-353 |
| Product Status | Obsolete |
| RoHS Status | RoHS non-compliant |
Substitute Part Grouping Explanation
Substitute parts for the PI74STX1G02CX are selected based on the following critical parameters that determine functional and mechanical compatibility:
Core Substitution Criteria:
- Logic Type: NOR Gate (1 channel, 2 inputs)
- Voltage Supply Range: Minimum 1.65V support required
- Output Current: 32mA minimum for both high and low states
- Package Compatibility: SC-70-5, SOT-353, or 5-TSSOP footprints
- Mounting Type: Surface Mount
Substitute Categories:
Category 1 - Direct Package Match (SC-70-5/SOT-353): Parts maintaining identical or compatible package footprints with the original PI74STX1G02CX, enabling direct PCB replacement without layout modifications.
Category 2 - Alternative Package Options (SOT-23-5, SC-74A): Parts with different but functionally equivalent packages, requiring PCB layout adjustment but maintaining electrical compatibility.
Category 3 - Enhanced Specifications: Parts offering improved quiescent current, extended temperature range, or RoHS compliance while maintaining core electrical parameters.
Parameter Comparison
| Part Number | Manufacturer | Series | Voltage - Supply | Current - Quiescent (Max) | Current - Output High, Low | Max Propagation Delay @ 5V, 50pF | Operating Temperature | Package / Case | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|
| PI74STX1G02CX | Diodes Incorporated | 74STX | 1.65V ~ 5.5V | 2 µA | 32mA, 32mA | 3.4ns | -40°C ~ 85°C | 5-TSSOP, SC-70-5, SOT-353 | Obsolete | RoHS non-compliant |
| 74LVC1G02SE-7 | Diodes Incorporated | 74LVC | 1.65V ~ 5.5V | 200 µA | 32mA, 32mA | 1.7ns | -40°C ~ 125°C | 5-TSSOP, SC-70-5, SOT-353 | Active | ROHS3 Compliant |
| 74LVCE1G02SE-7 | Diodes Incorporated | 74LVCE | 1.4V ~ 5.5V | 10 µA | 32mA, 32mA | 3.6ns | -40°C ~ 85°C | 5-TSSOP, SC-70-5, SOT-353 | Active | ROHS3 Compliant |
| 74LVC1G02GV,125 | Nexperia USA Inc. | 74LVC | 1.65V ~ 5.5V | 4 µA | 32mA, 32mA | 4ns | -40°C ~ 125°C | SC-74A, SOT-753 | Active | ROHS3 Compliant |
| 74LVC1G02GW,125 | Nexperia USA Inc. | 74LVC | 1.65V ~ 5.5V | 4 µA | 32mA, 32mA | 4ns | -40°C ~ 125°C | 5-TSSOP, SC-70-5, SOT-353 | Active | ROHS3 Compliant |
| NC7SZ02M5X | onsemi | 7SZ | 1.65V ~ 5.5V | 2 µA | 32mA, 32mA | 4.3ns | -40°C ~ 85°C | SC-74A, SOT-753 | Active | ROHS3 Compliant |
| NC7SZ02P5X | onsemi | 7SZ | 1.65V ~ 5.5V | 2 µA | 32mA, 32mA | 4.3ns | -40°C ~ 85°C | 5-TSSOP, SC-70-5, SOT-353 | Active | ROHS3 Compliant |
| NL17SZ02DFT2G | onsemi | 17SZ | 1.65V ~ 5.5V | 1 µA | 32mA, 32mA | 4.3ns | -55°C ~ 125°C | 5-TSSOP, SC-70-5, SOT-353 | Active | ROHS3 Compliant |
| SN74AHC1G02DCKR | Texas Instruments | 74AHC | 2V ~ 5.5V | 1 µA | 8mA, 8mA | 7.5ns | -40°C ~ 85°C | 5-TSSOP, SC-70-5, SOT-353 | Active | ROHS3 Compliant |
| SN74LVC1G02DBVR | Texas Instruments | 74LVC | 1.65V ~ 5.5V | 10 µA | 32mA, 32mA | 4.5ns | -40°C ~ 125°C | SC-74A, SOT-753 | Active | ROHS3 Compliant |
| SN74LVC1G02DBVRG4 | Texas Instruments | 74LVC | 1.65V ~ 5.5V | 10 µA | 32mA, 32mA | 4.5ns | -40°C ~ 125°C | SC-74A, SOT-753 | Discontinued at DiGi Electronics | ROHS3 Compliant |
Engineering Selection Recommendations
For Direct PCB Replacement (No Layout Changes): Select NC7SZ02P5X or 74LVC1G02GW,125 when package footprint compatibility with SC-70-5/5-TSSOP is required. Both parts maintain identical pinout and package dimensions while offering active product status and RoHS3 compliance.
For Lowest Quiescent Current: NL17SZ02DFT2G provides 1 µA quiescent current with extended operating temperature range (-55°C to 125°C) and RoHS3 compliance, suitable for battery-powered or ultra-low-power applications.
For Extended Temperature Range: 74LVC1G02SE-7, 74LVC1G02GV,125, 74LVC1G02GW,125, SN74LVC1G02DBVR, and NL17SZ02DFT2G all support -40°C to 125°C operating range, compared to the original part's -40°C to 85°C limit.
For RoHS Compliance: All substitute parts listed are RoHS3 compliant, addressing the non-compliant status of the obsolete PI74STX1G02CX.
For Reduced Output Current Applications: SN74AHC1G02DCKR provides 8mA output current (versus 32mA standard), suitable for low-power signal applications. Note: minimum supply voltage is 2V, not 1.65V.
Avoid: SN74LVC1G02DBVRG4 is discontinued at DiGi Electronics and should not be selected for new designs despite active status at other distributors.
Frequently Asked Questions (FAQ)
Q: Can I use any substitute part as a direct replacement without PCB modifications?
A: Direct PCB replacement without layout changes requires parts with identical or compatible package footprints. NC7SZ02P5X, 74LVC1G02SE-7, 74LVC1G02GW,125, and NL17SZ02DFT2G maintain SC-70-5/5-TSSOP compatibility. Parts with SC-74A or SOT-753 packages require PCB layout adjustment.
Q: What is the primary reason for substituting the PI74STX1G02CX?
A: The PI74STX1G02CX is classified as obsolete. Substitute parts provide active product status, ensuring long-term availability, RoHS3 compliance, and access to current manufacturing processes.
Q: Are all substitute parts pin-compatible with the original?
A: All substitute parts maintain the same logic function (1-channel 2-input NOR gate) and pinout configuration. Package footprints vary; verify physical package compatibility with your PCB design.
Q: Which substitute offers the best power efficiency?
A: NL17SZ02DFT2G provides the lowest quiescent current at 1 µA, making it optimal for battery-powered or ultra-low-power applications. NC7SZ02M5X and NC7SZ02P5X also match the original 2 µA specification.
Q: What is the difference between 74LVC and 74LVCE series?
A: 74LVCE1G02SE-7 supports lower minimum supply voltage (1.4V versus 1.65V) and features reduced quiescent current (10 µA versus 200 µA for standard 74LVC1G02SE-7), making it suitable for ultra-low-voltage applications.
Q: Can I use SN74AHC1G02DCKR as a substitute?
A: SN74AHC1G02DCKR is functionally compatible but has two limitations: minimum supply voltage is 2V (not 1.65V) and output current is 8mA (not 32mA). Use only if your application operates above 2V and does not require 32mA output drive.
Q: Which substitute has the fastest propagation delay?
A: 74LVC1G02SE-7 provides the fastest propagation delay at 1.7ns at 5V with 50pF load, compared to the original 3.4ns specification.
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