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Nexperia USA Inc. 74HCT27D,653
- Part No.:
- 74HCT27D,653
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74HCT27D,653.pdf
- Description:
- IC GATE NOR 3CH 3-INP 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,768
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Product details
Overview
74HCT27D,653 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 V), operating from 4.5 V to 5.5 V, rated for -40 °C to +125 °C, and housed in a SO14 (SOT108-1) package with 14 leads and 3.9 mm body width.
For engineers reviewing the 74HCT27D,653 datasheet, 74HCT27D,653 pinout, 74HCT27D,653 application, or 74HCT27D,653 equivalent, key selection factors include TTL-level input compatibility, propagation delay of 12–32 ns (VCC = 4.5–5.0 V), output drive capability of ±4.0 mA, low ICC supply current (≤40 μA), and industrial-temperature SO14 packaging.
Technical Context
The 74HCT27D,653 implements three independent 3-input NOR gates using CMOS technology with TTL-compatible input circuitry, enabling direct interfacing with legacy 5 V TTL logic families without level translation. Each gate features clamp diodes on all inputs, allowing safe use with current-limiting resistors when interfacing to voltages exceeding VCC.
Its static characteristics are specified across -40 °C to +125 °C, with VOH ≥ 3.98 V and VOL ≤ 0.26 V at IO = ±4.0 mA and VCC = 4.5 V, and dynamic performance defined by tpd = 12 ns (typ) to 32 ns (max) under 15 pF load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Triple 3-input NOR gate - provides three independent Boolean OR-NOT outputs per device. |
| Supply Voltage Range | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL systems and stable operation across industrial voltage tolerances. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - guarantees reliable recognition of TTL HIGH/LOW levels without external biasing. |
| Propagation Delay | 12 ns (typ) to 32 ns (max) at VCC = 4.5 V, CL = 15 pF - supports synchronous logic timing in medium-speed control and interface circuits. |
| Output Drive | ±4.0 mA at VOH/VOL - sufficient to drive multiple 74-series TTL inputs or small capacitive loads directly. |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood, industrial control, and high-reliability embedded applications. |
| Power Dissipation | CPD = 30 pF - enables accurate dynamic power estimation (PD = CPD × VCC² × fi × N) for thermal-aware system design. |
Pinout & Package
74HCT27D,653 is supplied in a plastic small outline package (SO14), designated SOT108-1: 14-lead, 3.9 mm body width, 1.27 mm lead pitch, and surface-mount compatible footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 2A, 3A (Pins 1, 3, 9) | Data input A for Gate 1/2/3 | First input of each 3-input NOR gate; accepts TTL-level signals with internal clamping diodes. |
| 1B, 2B, 3B (Pins 2, 4, 10) | Data input B for Gate 1/2/3 | Second input of each gate; electrically identical to A/C inputs; shares same VIH/VIL specs. |
| 1C, 2C, 3C (Pins 13, 5, 11) | Data input C for Gate 1/2/3 | Third input of each gate; enables full 3-input NOR functionality per channel without external wiring. |
| 1Y, 2Y, 3Y (Pins 12, 6, 8) | Data output Y for Gate 1/2/3 | Active-low NOR output (Y = NOT(A+B+C)); drives loads up to ±4.0 mA with rail-to-rail swing. |
| GND (Pin 7) | Ground reference | 0 V return path for all internal logic and I/O; must be low-impedance for noise immunity. |
| VCC (Pin 14) | Positive supply | Primary power connection; decoupling capacitor (100 nF) recommended within 5 mm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Enables plug-in replacement of 74LS27 in legacy 5 V systems without redesigning input interfaces. |
| Input clamp diodes | Permits safe interface to voltages > VCC via series current-limiting resistors, eliminating need for external protection. |
| High noise immunity | Guaranteed 400 mV noise margin at VCC = 5 V due to tightly controlled VIH/VIL thresholds and CMOS input structure. |
| Latch-up immunity | Exceeds 100 mA per JESD78 Class II Level B - prevents destructive latch-up during transient overvoltage events. |
| ESD robustness | HBM > 2000 V and CDM > 1000 V - reduces handling sensitivity and improves board-level reliability in manufacturing environments. |
Applications
| Industrial Control Logic | Legacy System Interface |
|---|---|
|
Use Scenario: Discrete safety interlock monitoring in PLC backplanes where three sensor inputs must inhibit actuator activation unless all are deasserted. IC Role / Device Role / Timing Role: Performs real-time 3-input NOR evaluation to generate immediate hardware-level shutdown signal with sub-32 ns latency. Use Value: Eliminates microcontroller polling overhead and firmware dependency, delivering deterministic fail-safe response. |
Use Scenario: Glue logic bridging between vintage 74LS TTL microprocessor buses and modern FPGA-based peripherals. IC Role / Device Role / Timing Role: Translates and combines address/control lines (e.g., /IORQ, /M1, /HALT) into composite enable signals. Use Value: Maintains timing integrity with <13 ns typical propagation delay while preserving TTL voltage compatibility. |
| Power Sequencing Monitor | Configurable Reset Generator |
|
Use Scenario: Validating simultaneous presence of +3.3 V, +5 V, and +12 V rails before releasing system reset in multi-rail power supplies. IC Role / Device Role / Timing Role: Acts as active-low "all-rails-good" detector; output goes HIGH only when all three inputs are LOW (rails OK). Use Value: Provides single-chip, zero-software solution with guaranteed 125 °C operation for harsh-environment power systems. |
Use Scenario: Generating synchronized reset pulses for mixed-voltage SoCs where multiple supply monitors feed independent inputs. IC Role / Device Role / Timing Role: Combines three independent reset assertions (e.g., POR, watchdog timeout, thermal fault) into unified system reset. Use Value: Reduces component count versus discrete diode-OR networks and avoids timing skew from cascaded logic. |
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 |
|---|---|---|---|
| SN74HCT27DR (Texas Instruments) | Identical logic function and TTL input thresholds; SO14 package; tpd = 13–33 ns (VCC = 4.5 V); ICC max = 40 μA. | Same industrial temperature range (-40 °C to +125 °C); JEDEC-compliant pinout and footprint. | Drop-in substitute where TI-sourced components are preferred for supply chain diversification. |
| 74HCT27PW,118 (Nexperia TSSOP14) | Same electrical specs but in TSSOP14 (SOT402-1) package: 4.4 mm body width, 0.65 mm pitch, lower profile (1.1 mm height). | Better thermal performance (7.3 mW/K derating above 81 °C) and higher density layout; not mechanically interchangeable with SO14. | Select when PCB space is constrained and reflow-compatible fine-pitch assembly is available. |
Compared with 74HCT27D,653, SN74HCT27DR offers identical functional and timing behavior with dual-source assurance, while 74HCT27PW,118 trades SO14 mechanical compatibility for compactness and improved thermal resistance-requiring layout revision but enabling denser designs.
Availability
74HCT27D,653 is available at Aetrix Electronics and suitable for industrial control logic, legacy system interface, power sequencing monitor, and configurable reset generator applications requiring stable component supply across extended temperature ranges.
Supply support for 74HCT27D,653 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 focused on high-volume, high-reliability logic, analog, and MOSFET solutions, with leadership in automotive-qualified and industrial-grade discrete and logic devices.
The 74HCT27D,653 belongs to Nexperia's 74HCT logic family, engineered specifically for robust 5 V TTL interoperability in industrial automation, instrumentation, and long-lifecycle embedded systems.
FAQ
Can 74HCT27D,653 operate at 3.3 V supply?
No. The 74HCT27D,653 is specified only for 4.5 V to 5.5 V operation per its Recommended Operating Conditions table. At 3.3 V, input thresholds (VIH = 2.0 V min) become unreliable, and output drive (VOH/VOL) falls outside specification. Use 74HC27 or 74LVC27 for 3.3 V systems.
What is the maximum capacitive load this device can drive reliably?
The 74HCT27D,653 is characterized up to 50 pF load capacitance in its test data (Table 9), with propagation delay and transition time specifications guaranteed at 15 pF. Driving >50 pF may increase tpd beyond 32 ns and degrade edge rates; add a buffer stage for heavier loads.
Does this part have Schmitt-trigger inputs?
No. The 74HCT27D,653 uses standard CMOS input buffers with fixed TTL-compatible thresholds (VIH = 2.0 V, VIL = 0.8 V at VCC = 5 V). It lacks hysteresis; for noisy signal conditioning, pair with a dedicated Schmitt-trigger device like 74HCT14.
Is the exposed pad on the DHVQFN variant (74HCT27BQ) required to be grounded?
No. Per datasheet section 5.1, the thermal pad on SOT762-1 (DHVQFN14) is not electrically connected. It may remain floating or be soldered to GND for thermal improvement, but no electrical requirement exists - grounding is optional and mechanically non-critical.
74HCT27D,653 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- NOR Gate
- Number of Circuits:
- 3
- Number of Inputs:
- 3
- Features:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Max):
- 2 µA
- Current - Output High, Low:
- 4mA, 4mA
- Input Logic Level - Low:
- 0.8V
- Input Logic Level - High:
- 2V
- Max Propagation Delay @ V, Max CL:
- 21ns @ 4.5V, 50pF
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
74HCT27D,653 FAQ
1.How can I place an order for 74HCT27D,653 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT27D,653 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 74HCT27D,653 reliable?
The price and inventory of 74HCT27D,653 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT27D,653 is usually 5 days.
3.What payment methods are accepted for 74HCT27D,653?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT27D,653 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT27D,653?
74HCT27D,653 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT27D,653 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 74HCT27D,653?
For technical support, including 74HCT27D,653 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT27D,653 requirements.
6.How does Aetrix verify that 74HCT27D,653 is sourced from the original manufacturer or authorized distributors?
All 74HCT27D,653 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 74HCT27D,653 meets industry standards.
7.What is the process for return or replacement of 74HCT27D,653?
All 74HCT27D,653 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT27D,653, 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 74HCT27D,653 part is unused and in its original packaging.
Return procedure for 74HCT27D,653:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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