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74VHC02N NOR Gate IC Equivalent & Substitute Parts
Part Overview
The 74VHC02N is a 4-channel 2-input NOR gate logic IC manufactured by onsemi in 14-MDIP packaging. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The 74VHC series operates across a wide supply voltage range of 2V to 5.5V, making it suitable for mixed-voltage logic applications. Substitute parts must maintain identical logic functionality, pin configuration, and electrical performance within specified tolerances.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Logic Type | NOR Gate |
| Number of Circuits | 4 |
| Number of Inputs | 2 |
| Voltage - Supply | 2V ~ 5.5V |
| Current - Quiescent (Max) | 2 µA |
| Current - Output High, Low | 8mA, 8mA |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Through Hole |
| Package / Case | 14-DIP (0.300", 7.62mm) |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the 74VHC02N is based on the following critical parameters:
- Logic Configuration: Identical 4-channel, 2-input NOR gate topology
- Supply Voltage Range: 2V ~ 5.5V compatibility required
- Output Drive Capability: 8mA output current (high and low)
- Quiescent Current: Maximum 2 µA
- Package Type: 14-DIP through-hole mounting with 0.300" (7.62mm) pitch
- Pin Compatibility: Identical pin assignment and functional pinout
The SN74AHC02N from Texas Instruments meets all substitution criteria. Both devices belong to the 74-series logic family and share identical logic functionality, pin configuration, and core electrical specifications. The primary difference is the extended operating temperature range of the substitute part (−40°C to 125°C versus −40°C to 85°C for the original).
Parameter Comparison
| Parameter | 74VHC02N (onsemi) | SN74AHC02N (Texas Instruments) |
|---|---|---|
| Logic Type | NOR Gate | NOR Gate |
| Number of Circuits | 4 | 4 |
| Number of Inputs | 2 | 2 |
| Voltage - Supply | 2V ~ 5.5V | 2V ~ 5.5V |
| Current - Quiescent (Max) | 2 µA | 2 µA |
| Current - Output High, Low | 8mA, 8mA | 8mA, 8mA |
| Max Propagation Delay @ 5V, 50pF | 7.5ns | 8.5ns |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
| Mounting Type | Through Hole | Through Hole |
| Package / Case | 14-DIP (0.300", 7.62mm) | 14-DIP (0.300", 7.62mm) |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | Not Applicable |
| Product Status | Obsolete | Active |
| RoHS Status | Not specified | ROHS3 Compliant |
Engineering Selection Recommendations
The SN74AHC02N is a direct functional substitute for the 74VHC02N. Selection should be based on the following factors:
Product Status: The 74VHC02N is obsolete, while the SN74AHC02N is active. For new designs or production continuity, the SN74AHC02N is the appropriate choice.
Compliance & Certifications: The SN74AHC02N carries ROHS3 compliance, meeting current environmental and regulatory requirements. Both parts maintain REACH Unaffected status and EAR99 export classification.
Operating Temperature: The SN74AHC02N supports an extended temperature range (-40°C to 125°C) compared to the original part (-40°C to 85°C). This provides additional thermal margin for applications operating at elevated ambient temperatures.
Electrical Performance: Propagation delay differs by 1ns (7.5ns versus 8.5ns at 5V, 50pF load). This marginal difference is negligible for most logic applications and does not impact functional compatibility.
Packaging & Pinout: Both devices use identical 14-DIP through-hole packaging with matching pin assignments, enabling direct board-level substitution without layout modifications.
Frequently Asked Questions (FAQ)
Q: Can the SN74AHC02N be used as a direct replacement for the 74VHC02N?
A: Yes. Both devices are 4-channel 2-input NOR gates with identical logic functionality, pin configuration, and electrical specifications within the 2V to 5.5V supply range. No circuit modifications are required.
Q: What is the difference in propagation delay between these parts?
A: The 74VHC02N has a maximum propagation delay of 7.5ns at 5V with a 50pF load, while the SN74AHC02N is specified at 8.5ns under identical conditions. This 1ns difference does not affect functional compatibility in standard logic applications.
Q: Are there packaging differences between these parts?
A: No. Both parts use 14-DIP through-hole packaging with 0.300" (7.62mm) pitch. They are mechanically and electrically interchangeable at the board level.
Q: Why is the 74VHC02N listed as obsolete?
A: The 74VHC02N has reached end-of-life status with onsemi. The SN74AHC02N from Texas Instruments remains in active production and is the recommended alternative for new designs and production orders.
Q: Does the extended operating temperature range of the SN74AHC02N affect compatibility?
A: No. The extended range (-40°C to 125°C versus -40°C to 85°C) provides additional thermal capability without compromising compatibility. Applications operating within the original temperature range experience no functional differences.
Q: What compliance certifications apply to the SN74AHC02N?
A: The SN74AHC02N is ROHS3 compliant and maintains REACH Unaffected status. Both parts carry EAR99 export classification.
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