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74LVC27D,118 NOR Gate IC Equivalent & Substitute Parts
Part Overview
The 74LVC27D,118 is a 3-channel NOR gate logic IC manufactured by NXP USA Inc. in a 14-SO surface mount package. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The 74LVC27 series provides low-voltage CMOS logic gating suitable for digital signal processing applications requiring multiple independent NOR gate functions.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Logic Type | NOR Gate |
| Number of Circuits | 3 |
| Number of Inputs | 3 |
| Voltage - Supply | 1.2V ~ 3.6V |
| Current - Quiescent (Max) | 40 µA |
| Current - Output High, Low | 24mA, 24mA |
| Operating Temperature | -40°C ~ 85°C |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the 74LVC27D,118 is determined by the following critical parameters:
- Logic Function: NOR gate with 3 channels and 3 inputs per channel
- Package Compatibility: 14-SOIC form factor with identical 0.154" width and 3.90mm dimensions
- Supply Voltage Range: Must accommodate the original 1.2V ~ 3.6V specification or provide overlap within system operating conditions
- Output Drive Capability: Current sourcing and sinking capacity must meet or exceed 24mA per output
- Thermal Operating Range: -40°C ~ 85°C compatibility
- Surface Mount Configuration: Identical mounting technology and pin assignment
The SN74LV27ADR from Texas Instruments meets these substitution criteria through functional equivalence in logic topology, package geometry, and electrical performance within the specified operating envelope.
Parameter Comparison
| Parameter | 74LVC27D,118 (NXP) | SN74LV27ADR (TI) | Compatibility Notes |
|---|---|---|---|
| Logic Type | NOR Gate | NOR Gate | Identical function |
| Number of Circuits | 3 | 3 | Identical channel count |
| Number of Inputs | 3 | 3 | Identical input configuration |
| Voltage - Supply | 1.2V ~ 3.6V | 2V ~ 5.5V | Overlapping range; SN74LV27ADR supports extended upper voltage |
| Current - Quiescent (Max) | 40 µA | 20 µA | SN74LV27ADR exhibits lower standby current |
| Current - Output High, Low | 24mA, 24mA | 12mA, 12mA | SN74LV27ADR provides reduced output drive; verify load requirements |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | Identical range |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | 14-SOIC (0.154", 3.90mm Width) | Pin-compatible package |
| Mounting Type | Surface Mount | Surface Mount | Identical mounting technology |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | Both meet environmental compliance |
Engineering Selection Recommendations
The SN74LV27ADR is the designated manufacturer-recommended substitute for the obsolete 74LVC27D,118. Selection of this alternative is supported by:
- Product Status Alignment: The SN74LV27ADR maintains active production status, ensuring long-term availability and supply chain stability compared to the obsolete 74LVC27D,118.
- Regulatory Compliance: Both components achieve ROHS3 compliance and REACH unaffected status, maintaining equivalent environmental and regulatory standing.
- Functional Equivalence: Identical logic topology, channel configuration, and pin assignment enable direct substitution without circuit redesign.
- Electrical Performance: The SN74LV27ADR operates within overlapping voltage ranges (2V ~ 5.5V encompasses the 1.2V ~ 3.6V specification) and maintains the required operating temperature range.
Critical Design Consideration: The SN74LV27ADR provides 12mA output drive capability compared to the original 24mA specification. Circuit designs dependent on maximum output current must be evaluated to confirm load compatibility with the reduced drive capacity.
Frequently Asked Questions (FAQ)
Q: Can the SN74LV27ADR be used as a direct pin-for-pin replacement?
A: Yes. Both components utilize the 14-SOIC package with identical pinout and signal assignments. No PCB modifications are required for physical substitution.
Q: What is the primary reason for substituting the 74LVC27D,118?
A: The 74LVC27D,118 is classified as obsolete. The SN74LV27ADR is the active-production equivalent, ensuring continued component availability and supply chain support.
Q: Are there voltage compatibility concerns when substituting?
A: The SN74LV27ADR operates at 2V ~ 5.5V, which overlaps the original 1.2V ~ 3.6V range. Systems operating at 1.2V to 2V require verification that the substitute meets minimum voltage thresholds. Systems operating at 3.3V or 5V are fully compatible.
Q: Does the reduced output current (12mA vs. 24mA) affect circuit performance?
A: Output current reduction must be evaluated against actual load impedance and fanout requirements. Circuits with light loads or high-impedance inputs are unaffected. Circuits requiring maximum current drive must be analyzed to confirm the 12mA specification is sufficient.
Q: Are both components RoHS compliant?
A: Yes. Both the 74LVC27D,118 and SN74LV27ADR are ROHS3 compliant with MSL rating of 1 (Unlimited), meeting equivalent environmental standards.
Q: What is the packaging format for the SN74LV27ADR?
A: The SN74LV27ADR is supplied in Tape & Reel (TR) format in the 14-SOIC package, suitable for automated assembly processes.
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