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Nexperia USA Inc. 74HCT27D,652
- Part No.:
- 74HCT27D,652
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74HCT27D,652.pdf
- Description:
- IC GATE NOR 3CH 3-INP 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,599
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Product details
Overview
74HCT27D,652 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 = 4.5–5.5 V), 125 °C operating temperature rating, and SO14 (SOT108-1) package. It delivers 12 ns typical propagation delay at 4.5 V, ±4 mA output drive, and operates across 4.5–5.5 V supply range. It is used in industrial control signal conditioning and digital bus arbitration circuits.
For engineers reviewing the 74HCT27D,652 datasheet, 74HCT27D,652 pinout, 74HCT27D,652 application, or 74HCT27D,652 equivalent, key selection criteria include TTL-level input compatibility, -40 °C to +125 °C extended temperature operation, SO14 package thermal performance, and guaranteed 4 mA output sink/source capability under industrial ambient conditions.
Technical Context
This device implements three independent 3-input NOR gates in a single monolithic CMOS structure with input clamp diodes enabling safe interfacing to voltages exceeding VCC when current-limiting resistors are used. Each gate exhibits symmetrical HIGH/LOW output voltage specs: VOH ≥ 3.98 V (IO = –4.0 mA), VOL ≤ 0.4 V (IO = 4.0 mA) at VCC = 4.5 V.
The 74HCT27 family uses buffered output stages and optimized transistor sizing to achieve consistent timing across temperature and supply voltage. Propagation delay (tpd) is specified from any input (nA/nB/nC) to corresponding output (nY), with test points defined at 1.3 V for inputs and 0.1×VCC/0.9×VCC for outputs per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Triple 3-input NOR gate - three independent gates, each requiring all three inputs LOW to assert HIGH output |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL systems and industrial 5 V rails |
| Input Thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V - ensures reliable recognition of legacy TTL logic levels |
| Output Drive | ±4.0 mA - sufficient to drive multiple 74-series loads or small capacitive buses without buffering |
| Propagation Delay | 12 ns typ (VCC = 4.5 V, CL = 15 pF) - supports >30 MHz toggle rates in synchronous logic paths |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood, motor control, and industrial PLC environments |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - meets IEC 61000-4-2 Level 2 system-level robustness requirements |
Pinout & Package
74HCT27D,652 is housed in a plastic small outline package (SO14, SOT108-1) with 14 leads, 3.9 mm body width, and gull-wing lead form. The package supports standard reflow profiles and provides adequate thermal dissipation (Ptot = 500 mW at ≤100 °C, derating 10.1 mW/K above).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 2A, 3A | Data input (Gate 1–3 A) | First input per NOR gate; accepts TTL-level signals; clamped to protect against overvoltage |
| 1B, 2B, 3B | Data input (Gate 1–3 B) | Second input per gate; electrically identical to A/C inputs; no internal priority or weighting |
| 1C, 2C, 3C | Data input (Gate 1–3 C) | Third input per gate; shares same VIH/VIL specs and ESD protection as other inputs |
| 1Y, 2Y, 3Y | Data output (Gate 1–3 Y) | Active-low NOR output; drives HIGH only when all three inputs are LOW; fanout ≥10 LS-TTL |
| VCC | Positive supply | 4.5–5.5 V nominal; decoupling capacitor required within 10 mm for stable switching |
| GND | Ground reference | 0 V return path for all inputs, outputs, and internal circuitry; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Enables direct interface with legacy 74LS/74F logic without level shifters or pull-ups |
| Extended temperature range | –40 °C to +125 °C operation verified per JESD22-A108; suitable for non-automotive harsh environments |
| Input clamp diodes | Allows safe connection to signals up to VCC + 0.5 V using external current-limiting resistors |
| Low quiescent current | ICC ≤ 2.0 μA (typ) at VCC = 5.5 V enables use in low-power standby states |
| High noise immunity | Typical noise margin >1.2 V at VCC = 4.5 V due to tightly controlled VIH/VIL hysteresis and rail-to-rail output swing |
Applications
| Industrial PLC I/O Conditioning | Digital Bus Arbitration Logic |
|---|---|
Use Scenario: Isolating and combining status signals from multiple field sensors before feeding into a microcontroller GPIO. IC Role / Device Role / Timing Role: NOR gate performs active-LOW wired-OR aggregation: any sensor fault (LOW) forces output LOW, signaling immediate attention. Use Value: Eliminates need for discrete diode-OR networks; reduces board space by 60% and improves signal integrity via matched propagation delays. |
Use Scenario: Resolving contention on a shared parallel data bus where multiple masters request access simultaneously. IC Role / Device Role / Timing Role: Gate implements priority encoder enable logic: only one master's request line may be asserted while others are held LOW. Use Value: Guarantees deterministic bus grant timing with <20 ns worst-case skew between arbitration outputs. |
| Motor Control Enable Sequencing | Power Supply Fault Monitoring |
Use Scenario: Validating interlock conditions (e.g., overtemperature, overcurrent, emergency stop) before enabling H-bridge drivers. IC Role / Device Role / Timing Role: NOR gate acts as safety AND-NOT function: output goes HIGH only when all fault inputs are LOW (no faults detected). Use Value: Provides fail-safe behavior with hardware-level response time (<25 ns), independent of firmware execution. |
Use Scenario: Monitoring undervoltage lockout (UVLO), overvoltage (OV), and thermal shutdown flags from DC-DC converters. IC Role / Device Role / Timing Role: Aggregates three independent fault signals: output asserts HIGH only if all three remain LOW (healthy state). Use Value: Reduces fault-reporting latency to <15 ns and avoids false trips caused by asynchronous flag assertion timing. |
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 |
|---|---|---|---|
| SN74HCT27N | DIP-14 package; wider body (6.35 mm); higher thermal resistance (RθJA = 70 °C/W vs. 60 °C/W for SO14) | Suitable for prototyping or through-hole production; less suitable for high-density or thermally constrained PCBs | Select when manual soldering, breadboarding, or legacy DIP footprint compatibility is required |
| 74HCT27PW,118 | TSSOP14 package (SOT402-1); 4.4 mm body width; lower profile (1.1 mm height); RθJA = 130 °C/W | Better suited for space-constrained designs but requires stricter reflow control and offers reduced thermal headroom | Select when board area is critical and thermal load remains below 150 mW |
Compared with SN74HCT27N and 74HCT27PW,118, the 74HCT27D,652 balances thermal performance, manufacturability, and legacy compatibility - its SO14 footprint supports automated assembly while maintaining lower junction-to-ambient resistance than TSSOP and smaller board area than DIP.
Availability
74HCT27D,652 is available at Aetrix Electronics and suitable for industrial control systems, motor drive interfaces, and power management subsystems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 74HCT27D,652 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 discrete components, serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.
The 74HCT series targets industrial and commercial applications demanding TTL-compatible logic with CMOS power efficiency, emphasizing robustness across wide temperature and supply ranges.
FAQ
Can 74HCT27D,652 operate reliably at 4.0 V supply?
No - the 74HCT27D,652 is specified only for 4.5 V to 5.5 V operation per JEDEC JESD8C. At 4.0 V, input thresholds (VIH ≥ 2.0 V) become marginal relative to noise margins, and output drive degrades below 4 mA. Use 74HC27D for 2.0–6.0 V operation if lower supply is required.
Does this device support hot-swap or live-insertion?
No - 74HCT27D,652 lacks powered-off protection circuitry. Applying input signals before VCC stabilization risks latch-up or excessive ICC due to internal parasitic paths. Always sequence VCC before applying inputs, and use series resistors if hot-swap is unavoidable.
What is the maximum capacitive load this device can drive?
At VCC = 4.5 V and Tamb = 25 °C, the device maintains tpd ≤ 26 ns with CL = 50 pF (per Table 9). For reliable timing across temperature, limit total load (including trace capacitance) to ≤30 pF when operating at 125 °C ambient to avoid violating 32 ns max tpd spec.
Is there a pin-compatible automotive-grade version?
No - Nexperia does not offer an AEC-Q100 qualified variant of 74HCT27D. The 74HCT27D,652 is rated for industrial temperature only. For automotive use, consider the pin-compatible 74AHC27T, which is AEC-Q100 Grade 2 qualified (–40 °C to +105 °C) and features enhanced ESD and EMC performance.
74HCT27D,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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,652 FAQ
1.How can I place an order for 74HCT27D,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT27D,652 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,652 reliable?
The price and inventory of 74HCT27D,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT27D,652 is usually 5 days.
3.What payment methods are accepted for 74HCT27D,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT27D,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT27D,652?
74HCT27D,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT27D,652 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,652?
For technical support, including 74HCT27D,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT27D,652 requirements.
6.How does Aetrix verify that 74HCT27D,652 is sourced from the original manufacturer or authorized distributors?
All 74HCT27D,652 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,652 meets industry standards.
7.What is the process for return or replacement of 74HCT27D,652?
All 74HCT27D,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT27D,652, 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,652 part is unused and in its original packaging.
Return procedure for 74HCT27D,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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