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Texas Instruments SN74HCT02DR
- Part No.:
- SN74HCT02DR
- Manufacturer:
- Texas Instruments
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74HCT02DR.pdf
- Description:
- IC GATE NOR 4CH 2-INP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:8,350
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Product details
Overview
SN74HCT02DR from Texas Instruments is a quadruple 2-input positive-NOR gate IC operating at 4.5–5.5 V, delivering 10ns typical propagation delay, ±4-mA output drive at 5 V, and ≤20-µA supply current. It performs Boolean NOR logic (Y = A + B) in TTL-compatible digital control circuits for industrial sequencers and microcontroller I/O expansion.
For engineers reviewing the SN74HCT02DR datasheet, SN74HCT02DR pinout, SN74HCT02DR application, or SN74HCT02DR equivalent, this page delivers verified electrical specs, SOIC-14 package details, functional mode behavior, real-world use cases, and two validated alternative parts with precise technical and application-level distinctions.
Technical Context
This device integrates four independent 2-input NOR gates in a single SOIC-14 package, each implementing Y = A + B in positive logic with TTL-voltage-compatible inputs (VIH = 2 V, VIL = 0.8 V). All unused inputs must be tied to VCC or GND to prevent floating states and undefined outputs.
It operates within –40°C to +85°C ambient temperature, supports up to 10 LSTTL loads per output, and features low input current (≤1 µA) and low power consumption (ICC ≤ 20 µA), making it suitable for noise-immune, low-static-power combinatorial logic in mixed-signal embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and microcontroller I/O rails without level shifting. |
| Propagation Delay (tpd) | 10 ns typical at 5.5 V - enables reliable timing in sub-100-MHz synchronous logic paths. |
| Output Drive | ±4 mA at 5 V - sufficient to directly interface with legacy LSTTL loads (up to 10 units) without buffering. |
| Input Compatibility | TTL-voltage levels (VIH ≥ 2 V, VIL ≤ 0.8 V) - allows direct connection to 5-V TTL outputs without translation. |
| Quiescent Current (ICC) | ≤20 µA max - minimizes standby power in battery-backed or energy-sensitive control modules. |
| Operating Temperature | –40°C to +85°C - certified for industrial-grade operation in factory automation and motor control enclosures. |
Pinout & Package
SN74HCT02DR uses a 14-pin SOIC (D) package measuring 8.65 mm × 3.90 mm with 1.27-mm lead pitch and 1.75-mm maximum height. Pin 1 is located at the top-left corner with a molded index notch or beveled edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 8, 9, 11, 12 | Input (A/B of each NOR gate) | Eight total inputs across four independent gates; all require defined logic levels (VCC or GND) to avoid metastability. |
| 3, 6, 10, 13 | Output (Y of each NOR gate) | Four buffered CMOS outputs capable of sourcing/sinking ±4 mA while maintaining TTL-compatible VOH/VOL. |
| 7 | GND | Ground reference for all internal circuitry and output drivers; requires low-impedance PCB connection. |
| 14 | VCC | Positive supply rail; must be decoupled with a 0.1-µF ceramic capacitor placed adjacent to the pin. |
Key Features
| Feature | Design Value |
|---|---|
| Quad 2-input NOR logic | Four independent gates enable compact implementation of multi-channel reset, enable, or inhibit logic without external gating. |
| TTL-compatible inputs | Accepts standard 5-V TTL output thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V), eliminating need for input level shifters in mixed-logic systems. |
| Low ICC quiescent current | ≤20 µA max ensures minimal power draw in always-on supervisory or watchdog circuits. |
| 10-ns typical tpd | Supports high-speed combinational logic in microcontroller peripheral glue logic and state-machine decode paths. |
| SOIC-14 packaging | Industry-standard surface-mount footprint enables automated assembly and compatibility with legacy board layouts. |
Applications
| Industrial PLC Input Conditioning | Microcontroller GPIO Expansion |
|---|---|
Use Scenario: Converting noisy, slow-rising sensor signals into clean, synchronized active-low enable pulses for relay drivers. IC Role / Device Role / Timing Role: NOR gate configured as an active-low OR (via De Morgan's law) to combine multiple fault inputs into a single shutdown signal. Use Value: Eliminates discrete diode-OR networks and reduces component count while guaranteeing deterministic timing (10 ns tpd) and noise immunity via TTL input thresholds. | Use Scenario: Extending limited MCU GPIO pins to drive multiple LED indicators or status flags in a medical diagnostic device. IC Role / Device Role / Timing Role: Combinatorial logic block generating inverted control signals for LED anode/cathode switching and multiplexed display enable lines. Use Value: Provides four independent, rail-to-rail output channels with ±4-mA drive strength-sufficient to directly sink/source LEDs without external transistors. |
| Legacy System Bus Interface | Power Sequencing Control |
Use Scenario: Interfacing modern microcontrollers with older 5-V parallel bus peripherals requiring active-low chip select generation. IC Role / Device Role / Timing Role: NOR-based address decoder producing gated /CS signals when address bits match specific patterns. Use Value: Delivers predictable 10-ns propagation delay and TTL-compatible voltage margins, ensuring setup/hold compliance with legacy bus timing budgets. | Use Scenario: Generating synchronized power-good and reset coordination signals during multi-rail DC/DC converter startup sequences. IC Role / Device Role / Timing Role: Glue logic element combining /PGOOD signals from three regulators to assert system-wide /RESET only after all rails stabilize. Use Value: Enables fail-safe sequencing using only one IC-no FPGA or CPLD required-while maintaining <20-µA static current during hold states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NOR gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC02DR | CMOS input thresholds (VIH = 3.15 V, VIL = 1.35 V); identical SOIC-14 package and pinout. | Requires clean 5-V logic sources; not tolerant of marginal TTL-level inputs. | Select when interfacing exclusively with HC/HCT or microcontroller GPIOs-not legacy TTL. |
| MC74VHC02DT | Higher speed (tpd = 7.5 ns typ), wider VCC range (2–5.5 V), same pinout and function. | Valid for mixed 3.3-V/5-V systems; supports lower-voltage logic families without level shifters. | Choose for next-gen designs needing faster timing or dual-supply flexibility beyond HCT's 4.5–5.5 V window. |
Compared with SN74HCT02DR, SN74HC02DR lacks TTL input compatibility but offers lower dynamic power, while MC74VHC02DT extends voltage range and improves speed-making both viable alternatives depending on input source type and supply architecture.
Availability
SN74HCT02DR is available at Aetrix Electronics and suitable for industrial PLCs, microcontroller-based instrumentation, legacy bus interfaces, and power sequencing subsystems requiring stable component supply and long-term manufacturability.
Supply support for SN74HCT02DR 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74HCT logic family was designed specifically for TTL-to-CMOS bridging in 5-V systems-delivering pin-compatible replacements with CMOS power efficiency and TTL input compatibility for legacy design refreshes.
FAQ
What is the recommended bypass capacitor for SN74HCT02DR?
A 0.1-µF ceramic capacitor is recommended between VCC (pin 14) and GND (pin 7) for SN74HCT02DR, placed as close as possible to the device. This minimizes high-frequency noise coupling and stabilizes the supply rail during output transitions. For enhanced noise rejection, TI also suggests paralleling with a 1-µF capacitor, especially in electrically noisy industrial environments where SN74HCT02DR is commonly deployed.
Can SN74HCT02DR operate at 3.3 V?
No, SN74HCT02DR is not rated for 3.3-V operation. Its recommended operating voltage range is strictly 4.5 V to 5.5 V, and absolute maximum VCC is 7 V. Attempting to power SN74HCT02DR at 3.3 V will result in unreliable logic levels, increased propagation delay, and potential failure to meet VIH/VIL specifications. For 3.3-V systems, consider MC74VHC02DT or SN74LVC02APW instead.
How many unused inputs can be left floating on SN74HCT02DR?
Zero. All eight inputs of SN74HCT02DR (pins 1,2,4,5,8,9,11,12) must be actively tied to either VCC or GND-even if unused-to prevent floating nodes that cause excessive ICC, oscillation, or erratic output behavior. TI explicitly mandates this in the datasheet (Section 5.2 Note 1) because floating CMOS inputs induce shoot-through current and thermal instability in SN74HCT02DR.
Is SN74HCT02DR RoHS compliant and lead-free?
Yes, SN74HCT02DR is RoHS compliant and features a NIPDAU (nickel-palladium-gold) lead finish. Per TI's Packaging Information Addendum, it carries "Yes" under RoHS and "NIPDAU | SN" under Lead finish/Ball material. It is qualified for lead-free reflow per JEDEC Level-1-260°C-UNLIM, confirming full compliance with EU RoHS Directive 2011/65/EU and related environmental standards.
What is the thermal resistance (RθJA) of SN74HCT02DR in its SOIC package?
The junction-to-ambient thermal resistance (RθJA) for SN74HCT02DR in the SOIC (D) package is 138.7°C/W, as specified in Section 5.3 of the datasheet. This value applies under standard JEDEC test conditions (single-layer board, no airflow) and reflects the device's ability to dissipate heat in typical PCB layouts. Designers should verify board layout, copper area, and airflow to ensure actual operating junction temperature remains below 150°C-the absolute maximum TJ rating for SN74HCT02DR.
SN74HCT02DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- 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:
- 4
- Number of Inputs:
- 2
- 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:
- 18ns @ 5.5V, 50pF
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74HCT02DR FAQ
1.How can I place an order for SN74HCT02DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT02DR 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 SN74HCT02DR reliable?
The price and inventory of SN74HCT02DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT02DR is usually 5 days.
3.What payment methods are accepted for SN74HCT02DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT02DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCT02DR?
SN74HCT02DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT02DR 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 SN74HCT02DR?
For technical support, including SN74HCT02DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT02DR requirements.
6.How does Aetrix verify that SN74HCT02DR is sourced from the original manufacturer or authorized distributors?
All SN74HCT02DR 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 SN74HCT02DR meets industry standards.
7.What is the process for return or replacement of SN74HCT02DR?
All SN74HCT02DR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT02DR, 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 SN74HCT02DR part is unused and in its original packaging.
Return procedure for SN74HCT02DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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