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Texas Instruments SN74HCT74NSRE4
- Part No.:
- SN74HCT74NSRE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74HCT74NSRE4.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,806
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Product details
Overview
SN74HCT74NSRE4 from Texas Instruments is a dual D-type positive-edge-triggered flip-flop with independent preset (PRE) and clear (CLR) inputs, operating at 4.5 V–5.5 V supply voltage, delivering 17 ns typical propagation delay (tpd), ±4-mA output drive at 5 V, and TTL-compatible input thresholds. It serves as a synchronous storage element in digital control logic, clock-domain synchronization, and state-machine sequencing in industrial PLC modules.
For engineers reviewing the SN74HCT74NSRE4 datasheet, SN74HCT74NSRE4 pinout, SN74HCT74NSRE4 application, or SN74HCT74NSRE4 equivalent, key selection criteria include its 14-pin SOIC package, guaranteed 22 MHz maximum clock frequency at 5.5 V, low 40-μA max ICC quiescent current, and compatibility with legacy TTL-level signal sources in mixed-voltage logic interfaces.
Technical Context
The SN74HCT74NSRE4 implements two independent edge-triggered storage cells, each with asynchronous active-low PRE and CLR inputs that override clocked data transfer. Its triggering is voltage-level–based-not dependent on CLK rise time-ensuring robust operation across varying slew rates.
Each flip-flop accepts TTL-compatible inputs (VIH = 2 V min, VIL = 0.8 V max), drives up to 10 LSTTL loads, and maintains defined outputs during hold-time violation due to internal metastability mitigation. The device operates within –40°C to +85°C ambient temperature range and supports 50-pF capacitive load switching per output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures interoperability with standard 5-V TTL and CMOS systems without level-shifting. |
| Max Clock Frequency | 22 MHz at 5.5 V - supports medium-speed synchronous logic in microcontroller peripherals and interface glue logic. |
| Propagation Delay (tpd) | 17 ns typical (CLK→Q), 40 ns max (PRE/CLR→Q) - enables precise timing budgeting in pipeline stages and latch-based sampling. |
| Output Drive | ±4 mA at 5 V - sufficient to directly drive multiple LSTTL inputs or small LED indicators without external buffers. |
| Input Current | ≤1 μA max - minimizes loading on upstream drivers and reduces power loss in high-fanout bus configurations. |
| Quiescent ICC | 40 μA max - supports low-static-power designs in battery-backed or energy-constrained embedded subsystems. |
Pinout & Package
SN74HCT74NSRE4 is housed in a 14-pin Small Outline (SO) package (body size 10.20 mm × 5.30 mm), RoHS-compliant, with standard JEDEC MO-095 outline and 1.27-mm lead pitch. Pin 1 is marked by a beveled corner or notch on the package top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (1CLR) | Asynchronous Clear Input (Channel A) | Active-low reset: forces QA = 0, QA̅ = 1 regardless of clock or data state. |
| 2 (1D) | Data Input (Channel A) | Samples and latches logic level on rising CLK edge when PRE/CLR are inactive. |
| 3 (1CLK) | Clock Input (Channel A) | Positive-edge–triggered; voltage-threshold detection ensures reliable timing across slow/fast edges. |
| 4 (1PRE) | Asynchronous Preset Input (Channel A) | Active-low set: forces QA = 1, QA̅ = 0 independently of clock or data. |
| 5 (1Q) | True Output (Channel A) | Complementary to QA̅; sourced/sunk via push-pull output stage with rail-to-rail swing. |
| 6 (1QA̅) | Inverted Output (Channel A) | Logic complement of 1Q; provides both polarities for feedback or differential signaling. |
| 7 (GND) | Ground Reference | Return path for all internal logic and I/O; must be low-impedance to minimize ground bounce. |
| 8 (2QA̅) | Inverted Output (Channel B) | Independent channel output; electrically isolated from Channel A except shared VCC/GND rails. |
| 9 (2Q) | True Output (Channel B) | Non-inverted output of second flip-flop; identical electrical specs to 1Q. |
| 10 (2PRE) | Asynchronous Preset Input (Channel B) | Independent control of Channel B; no crosstalk with Channel A PRE/CLR signals. |
| 11 (2CLK) | Clock Input (Channel B) | Separate clock domain from Channel A; enables dual-synchronous operation with independent timing. |
| 12 (2D) | Data Input (Channel B) | Independent data path; setup/hold times referenced to local 2CLK edge. |
| 13 (2CLR) | Asynchronous Clear Input (Channel B) | Independent reset for Channel B; allows selective initialization without affecting Channel A. |
| 14 (VCC) | Positive Supply | 4.5–5.5 V DC; requires local 0.1-μF ceramic bypass capacitor placed ≤3 mm from pin. |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous Set/Reset | Independent PRE/CLR per channel enable immediate state forcing without waiting for clock edge-critical for fault recovery and power-up initialization. |
| TTL-Compatible Inputs | VIH = 2 V min / VIL = 0.8 V max ensures direct interfacing with legacy 5-V TTL families (e.g., 74LS) without level shifters or pull-ups. |
| Low Quiescent Power | 40-μA max ICC allows use in always-on monitoring circuits where standby current must remain below 100 μA. |
| Controlled Output Rise/Fall | Typical tPLH/tPHL = 7–8 ns ensures clean signal edges into 50-pF loads, reducing EMI and timing uncertainty in dense PCB layouts. |
| Wide Operating Temperature | –40°C to +85°C ambient rating supports deployment in industrial automation enclosures and outdoor telemetry nodes. |
Applications
| Industrial Control Sequencing | Digital Signal Sampling |
|---|---|
Use Scenario: Synchronizing sensor readouts across multiple analog-to-digital converters in a programmable logic controller (PLC) backplane. IC Role / Device Role / Timing Role: Dual-channel edge-triggered latch capturing parallel ADC outputs on a common system clock edge while enabling independent reset per channel during calibration cycles. Use Value: Eliminates metastability risk in multi-source sampling and allows deterministic state restoration without halting the main clock domain. | Use Scenario: Capturing status flags from isolated fieldbus transceivers (e.g., RS-485 or CAN PHY) before forwarding to a microcontroller GPIO port. IC Role / Device Role / Timing Role: Level-shifting and synchronizing asynchronous interrupt signals into the MCU's clock domain using independent PRE/CLR for glitch suppression. Use Value: Prevents spurious interrupts caused by noise on long cables and ensures single-cycle registration of valid events. |
| State-Machine State Register | Legacy System Glue Logic |
Use Scenario: Implementing a 2-bit counter or finite-state machine (FSM) in a cost-sensitive consumer appliance control board with no FPGA or dedicated logic IC. IC Role / Device Role / Timing Role: Storing current FSM state bits; PRE/CLR pins initialize known states at power-up or error recovery, while CLK advances transitions. Use Value: Reduces BOM count versus microcontroller-based solutions and guarantees deterministic startup behavior without firmware dependency. | Use Scenario: Interfacing a modern 5-V microcontroller with legacy 74LS-series peripheral chips in retro-computing hardware restoration projects. IC Role / Device Role / Timing Role: Translating between HCT's higher noise margin and LS's lower input thresholds while providing fanout buffering and clock domain isolation. Use Value: Enables drop-in replacement of obsolete 74LS74 without redesigning PCB traces or adding discrete resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT74DR | Same logic function, SOIC-14 package, identical electrical specs; differs only in lead finish (NIPDAU vs NIPDAU/SN) and tape-and-reel packaging configuration. | No functional difference; both rated for –40°C to +85°C and support same 5-V supply and TTL input compatibility. | Select SN74HCT74DR if standard NIPDAU finish is required or if procurement prefers TI's default reel orientation (Q1 quadrant). |
| 74VHC74M | Higher VCC range (2–5.5 V), faster tpd (6.5 ns typ), but lower output drive (±8 mA) and non-TTL-compatible inputs (VIH = 3.3 V min at 5 V). | Not suitable for direct TTL interfacing; requires level translation when driving 74LS loads or receiving from 74LS outputs. | Choose 74VHC74M only when operating below 4.5 V or requiring sub-10-ns timing; avoid when mixing with legacy TTL signal sources. |
Compared with SN74HCT74DR, SN74HCT74NSRE4 offers identical functionality with enhanced lead finish consistency (NIPDAU-only) and tighter reel packaging control, while 74VHC74M trades TTL compatibility for wider supply range and speed-making SN74HCT74NSRE4 optimal for robust 5-V industrial interfacing where signal integrity and backward compatibility are primary concerns.
Availability
SN74HCT74NSRE4 is available at Aetrix Electronics and suitable for industrial control sequencing, digital signal sampling, state-machine state register, and legacy system glue logic requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.
Supply support for SN74HCT74NSRE4 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 ICs, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74HCT74NSRE4 belongs to TI's 74HCT logic family, designed specifically for TTL-compatible 5-V digital systems requiring low power, high noise immunity, and seamless integration with legacy components.
FAQ
What is the maximum clock frequency supported by SN74HCT74NSRE4?
The SN74HCT74NSRE4 supports a maximum clock frequency of 22 MHz at VCC = 5.5 V and TA = 25°C, as specified in the Switching Characteristics table. At 4.5 V, the maximum frequency drops to 18 MHz. These values assume CL = 50 pF and proper bypassing; actual system-level performance may vary with layout parasitics and load capacitance. SN74HCT74NSRE4 does not guarantee operation above these frequencies under recommended conditions.
Does SN74HCT74NSRE4 require external pull-up or pull-down resistors on unused inputs?
Yes - all unused inputs of SN74HCT74NSRE4 must be tied to either VCC or GND to prevent floating states that cause excessive ICC, unpredictable outputs, or increased EMI. This requirement is explicitly stated in TI's Recommended Operating Conditions section. Leaving inputs unconnected violates the device's functional specification and risks erratic behavior in production systems using SN74HCT74NSRE4.
Can SN74HCT74NSRE4 directly drive a 74LS00 NAND gate input?
Yes - SN74HCT74NSRE4 can directly drive a 74LS00 input because its VOH (min 3.7 V at IOL = 4 mA, VCC = 4.5 V) exceeds the 74LS VIH threshold (2 V min), and its VOL (max 0.33 V at IOL = 4 mA) stays below the 74LS VIL limit (0.8 V max). This TTL-compatible interface is a core design feature of the SN74HCT74NSRE4 family and requires no external components.
What is the thermal resistance (RθJA) of the SN74HCT74NSRE4 package?
The SN74HCT74NSRE4 uses a 14-pin SO (NS) package with a junction-to-ambient thermal resistance (RθJA) of 88.4°C/W, as documented in the Thermal Information table. This value assumes standard JEDEC 2S2P test board conditions. For sustained operation near maximum ratings, designers should verify board-level copper area and airflow to ensure TJ remains below 150°C under worst-case power dissipation of SN74HCT74NSRE4.
Is SN74HCT74NSRE4 pin-compatible with SN74HCT74N (PDIP-14)?
Yes - SN74HCT74NSRE4 (SO-14) and SN74HCT74N (PDIP-14) share identical pin functions and numbering, including 1CLR, 1D, 1CLK, 1PRE, 1Q, 1QA̅, GND, 2QA̅, 2Q, 2PRE, 2CLK, 2D, 2CLR, and VCC. However, their physical footprints differ significantly: SO-14 has 1.27-mm pitch and 10.20 × 5.30 mm body, while PDIP-14 measures 19.31 × 6.35 mm with 2.54-mm pitch. PCB layout changes are required for substitution, though schematic connectivity remains identical for SN74HCT74NSRE4 and SN74HCT74N.
SN74HCT74NSRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Set(Preset) and Reset
- Type:
- D-Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 46 MHz
- Max Propagation Delay @ V, Max CL:
- 25ns @ 5.5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 4mA, 4mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
SN74HCT74NSRE4 FAQ
1.How can I place an order for SN74HCT74NSRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT74NSRE4 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 SN74HCT74NSRE4 reliable?
The price and inventory of SN74HCT74NSRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT74NSRE4 is usually 5 days.
3.What payment methods are accepted for SN74HCT74NSRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT74NSRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCT74NSRE4?
SN74HCT74NSRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT74NSRE4 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 SN74HCT74NSRE4?
For technical support, including SN74HCT74NSRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT74NSRE4 requirements.
6.How does Aetrix verify that SN74HCT74NSRE4 is sourced from the original manufacturer or authorized distributors?
All SN74HCT74NSRE4 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 SN74HCT74NSRE4 meets industry standards.
7.What is the process for return or replacement of SN74HCT74NSRE4?
All SN74HCT74NSRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT74NSRE4, 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 SN74HCT74NSRE4 part is unused and in its original packaging.
Return procedure for SN74HCT74NSRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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