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NXP Semiconductors 74HCT27PW,112
- Part No.:
- 74HCT27PW,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Gates and Inverters
- Package:
- -
- Datasheet:
-
74HCT27PW,112.pdf
- Description:
- IC GATE NOR
- Quantity:
- Payment:
- Shipping:
Inventory:8,156
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Product details
Overview
74HCT27PW,112 from Nexperia is a triple 3-input NOR gate logic IC with TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5.0 V), operating from 4.5 V to 5.5 V, rated for -40 °C to +125 °C, and housed in a 14-lead TSSOP package (SOT402-1). It delivers 12 ns typical propagation delay at 5 V/15 pF and supports industrial control bus interfacing.
For engineers reviewing the 74HCT27PW,112 datasheet, 74HCT27PW,112 pinout, 74HCT27PW,112 application, or 74HCT27PW,112 equivalent, this device is selected for level-translating combinational logic in mixed-voltage digital systems where TTL-level inputs must drive CMOS outputs with low static current (ICC ≤ 2.0 μA) and high noise immunity (VIH/VIL margins > 1.2 V).
Technical Context
This device implements three independent 3-input NOR gates in a single monolithic CMOS structure with integrated input clamp diodes enabling safe interface to voltages exceeding VCC when used with current-limiting resistors. Each gate exhibits identical truth table behavior: output HIGH only when all three inputs are LOW.
Its TTL-compatible input stage ensures direct compatibility with legacy 5 V TTL logic families without external level shifters, while its CMOS output stage provides rail-to-rail swing (VOH ≥ 3.98 V, VOL ≤ 0.26 V at IO = ±4 mA) and low dynamic power dissipation (CPD = 30 pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Triple 3-input NOR: Y = NOT(A OR B OR C), three independent gates |
| Supply Voltage Range | 4.5 V to 5.5 V - matches standard 5 V TTL and mixed-signal system rails |
| Propagation Delay | 12 ns typ @ VCC = 5.0 V, CL = 15 pF - enables reliable operation up to ~30 MHz toggle rate |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - guarantees interoperability with 74LS/74F TTL outputs |
| Output Drive | ±4.0 mA @ VCC = 4.5 V - sufficient to drive 10 LSTTL loads or 20 CMOS inputs |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood automotive modules and industrial PLCs |
| Static Current | ICC ≤ 2.0 μA @ VCC = 5.5 V - negligible quiescent power in always-on control logic |
Pinout & Package
TSSOP14 plastic thin shrink small outline package (SOT402-1); 14 leads; body width 4.4 mm; 0.65 mm lead pitch; exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 9 | 1A, 2A, 3A | First input of each NOR gate - accepts TTL-level signals directly |
| 2, 4, 10 | 1B, 2B, 3B | Second input of each NOR gate - clamped diodes allow overvoltage tolerance |
| 13, 5, 11 | 1C, 2C, 3C | Third input of each NOR gate - identical electrical characteristics across all inputs |
| 12, 6, 8 | 1Y, 2Y, 3Y | Active-low NOR output - drives HIGH only when all three inputs are LOW |
| 7 | GND | Ground reference (0 V) - mandatory for stable logic thresholds and noise rejection |
| 14 | VCC | Positive supply - must be decoupled locally with 100 nF ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH ≥ 2.0 V and VIL ≤ 0.8 V at 5 V - eliminates need for external level translators when interfacing with 74LS devices |
| Input clamp diodes | Integrated anode-cathode structures on all inputs - enable safe connection to signals up to VCC + 0.5 V using series resistors |
| High noise immunity | Typical noise margin > 1.2 V at VCC = 5 V - suppresses false triggering in electrically noisy industrial environments |
| Wide temperature range | Specified from -40 °C to +125 °C - supports deployment in engine control units and motor drives without derating |
| Low dynamic power | CPD = 30 pF - limits switching power to < 1 mW at 1 MHz with 15 pF load, reducing thermal load in dense PCB layouts |
Applications
| Industrial PLC I/O Expansion | Legacy System Bus Interface |
|---|---|
|
Use Scenario: Adding discrete logic to extend parallel I/O capability in programmable logic controllers using 5 V TTL backplanes. IC Role / Device Role / Timing Role: NOR gate implements active-low enable decoding for peripheral address selection and interrupt masking. Use Value: Eliminates need for discrete transistor-based logic, reduces board area by 60% vs. discrete solutions, and maintains timing integrity with <15 ns propagation delay. |
Use Scenario: Interfacing modern microcontrollers with legacy 74LS-based peripheral cards in test equipment and instrumentation. IC Role / Device Role / Timing Role: Level-shifting combinatorial logic block translating MCU GPIO outputs to TTL-compatible enable/control signals. Use Value: Provides deterministic setup/hold timing with no external biasing, enabling drop-in replacement of obsolete 74LS27 in field-repair scenarios. |
| Automotive Body Control Module | Power Sequencing Supervisor |
|
Use Scenario: Implementing fault-safe interlock logic in 12 V automotive body control units where multiple sensor inputs must inhibit actuator activation. IC Role / Device Role / Timing Role: Three-input NOR detects simultaneous fault conditions (e.g., door open + seat occupied + ignition on) to assert safety lockout signal. Use Value: Qualified to 125 °C ambient, withstands automotive thermal cycling, and delivers fail-safe behavior with no internal state retention. |
Use Scenario: Generating synchronized reset pulses for multi-rail power supplies in FPGA-based embedded systems requiring strict sequencing. IC Role / Device Role / Timing Role: Combinatorial gate combines power-good signals from three DC/DC converters to generate system-wide reset when any rail fails. Use Value: Propagation delay variation <3 ns across temperature ensures deterministic reset assertion timing critical for FPGA configuration integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple 3-input NOR gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT27PWR | TI part in TSSOP-14; VIH = 2.0 V min, but ICC = 4 μA max (vs. 2 μA for Nexperia) | Higher static current increases standby power in battery-backed systems | Prefer 74HCT27PW,112 for ultra-low-quiescent designs; SN74HCT27PWR acceptable where TI sourcing is preferred |
| 74HCT27D,118 | Nexperia SO14 version (SOT108-1); identical electrical specs but larger footprint and higher thermal resistance | Less suitable for space-constrained PCBs; 10.1 mW/K derating above 100 °C vs. 7.3 mW/K for TSSOP | Select 74HCT27PW,112 for high-density layouts or thermally demanding locations; use SO14 only if legacy footprint compatibility required |
Compared with SN74HCT27PWR and 74HCT27D,118, the 74HCT27PW,112 offers the lowest static current and best thermal performance in the smallest footprint, making it optimal for compact, low-power industrial and automotive control logic where long-term reliability and minimal self-heating are critical.
Availability
74HCT27PW,112 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and power sequencing supervisors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT27PW,112 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Nexperia is a global semiconductor expert delivering high-performance logic, analog, and MOSFET solutions optimized for efficiency, reliability, and manufacturability in high-volume applications.
The 74HCT series targets robust, pin-compatible replacements for legacy TTL logic in industrial, automotive, and computing systems-designed specifically for seamless integration into mixed-voltage digital subsystems without redesign.
FAQ
Can 74HCT27PW,112 operate at 3.3 V supply?
No. The 74HCT27PW,112 is specified only for 4.5 V to 5.5 V operation per its recommended conditions. At 3.3 V, input thresholds (VIH ≥ 2.0 V) become non-compliant with standard 3.3 V logic families, and output drive strength degrades significantly. Use 74HC27 variants for 2.0–6.0 V operation including 3.3 V.
Does this device require external pull-up or pull-down resistors on unused inputs?
Yes. Unused inputs must be tied to VCC or GND to prevent floating states that cause increased ICC, erratic output behavior, and potential ESD susceptibility. The internal clamp diodes do not eliminate the need for defined DC bias-floating inputs induce shoot-through current and oscillation.
What is the maximum capacitive load this device can drive reliably?
The device is characterized up to 50 pF load capacitance (per Table 9), with guaranteed timing at 15 pF. Driving >50 pF risks exceeding transition time limits (tt ≤ 22 ns max at 5 V), increasing EMI and potentially violating setup/hold times in synchronous systems. For >50 pF, add a buffer stage or reduce trace length.
Is the exposed pad on the TSSOP package electrically connected?
No. The exposed thermal pad in SOT402-1 is not electrically connected to any internal node. Per Nexperia documentation, it may remain floating or be soldered to GND for thermal improvement-but must never be connected to VCC or other signals, as no internal bond wire attaches to it.
74HCT27PW,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Circuits:
- -
- Number of Inputs:
- -
- Features:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Max):
- -
- Current - Output High, Low:
- -
- Input Logic Level - Low:
- -
- Input Logic Level - High:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
74HCT27PW,112 FAQ
1.How can I place an order for 74HCT27PW,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT27PW,112 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 74HCT27PW,112 reliable?
The price and inventory of 74HCT27PW,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT27PW,112 is usually 5 days.
3.What payment methods are accepted for 74HCT27PW,112?
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4.How is shipping managed for 74HCT27PW,112?
74HCT27PW,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT27PW,112 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 74HCT27PW,112?
For technical support, including 74HCT27PW,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT27PW,112 requirements.
6.How does Aetrix verify that 74HCT27PW,112 is sourced from the original manufacturer or authorized distributors?
All 74HCT27PW,112 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 74HCT27PW,112 meets industry standards.
7.What is the process for return or replacement of 74HCT27PW,112?
All 74HCT27PW,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT27PW,112, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 74HCT27PW,112 part is unused and in its original packaging.
Return procedure for 74HCT27PW,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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