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Texas Instruments SN74HCT374NSR
- Part No.:
- SN74HCT374NSR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74HCT374NSR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,445
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Product details
Overview
SN74HCT374NSR from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, operating at 4.5 V–5.5 V supply voltage, delivering ±6 mA output drive at 5 V, featuring 22 ns typical propagation delay (tpd), and supporting bus-hold-free parallel loading in industrial I/O port and bidirectional data bus applications.
For engineers reviewing the SN74HCT374NSR datasheet, SN74HCT374NSR pinout, SN74HCT374NSR application, or SN74HCT374NSR equivalent, this page delivers verified electrical specs, functional mode behavior, package-validated pin mapping, and real-world interface design implications for high-capacitance bus driving and register buffering.
Technical Context
The SN74HCT374NSR implements eight independent D-type latches synchronized to the rising edge of CLK, with asynchronous output-enable (OE) control that places all Q outputs into high-impedance without affecting internal state retention. Its TTL-compatible inputs and CMOS-compatible outputs enable mixed-logic interfacing.
It operates strictly within 4.5 V–5.5 V VCC, supports 25 MHz maximum clock frequency at 5.5 V, and exhibits 10 ns minimum hold time (thh) and 23 ns minimum setup time (tsu) - parameters validated for stable operation across −40°C to +85°C ambient temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL/CMOS systems and robust noise margin under rail variation. |
| tpd (CLK→Q) | 25 ns max at 5.5 V - defines worst-case timing budget for synchronous data capture in register pipelines. |
| IOH / IOL | ±6 mA at VCC = 5 V - enables direct drive of 15 LSTTL loads without external buffers or pull-ups. |
| tsu / thh | 23 ns setup / 10 ns hold at 5.5 V - constrains minimum data valid window before and after clock edge for reliable sampling. |
| ICC (max) | 80 μA - confirms ultra-low static power consumption suitable for always-on register stages. |
| Output Type | 3-state true outputs - allows shared-bus arbitration via OE control without contention or bus loading during disable. |
| Input Compatibility | TTL-voltage compatible - accepts standard 0.8 V/2.0 V VIH/VIL thresholds, eliminating level-shifting in legacy 5 V systems. |
Pinout & Package
SOP-20 (NS) package: 15.00 mm × 5.30 mm body, 1.27 mm lead pitch, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1 (260°C peak reflow), rated for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–8 (D1–D8) | Data inputs | Asynchronous parallel data inputs latched on CLK↑; must be stable ≥23 ns before clock edge. |
| 9 (GND) | Ground reference | Common return path for logic and output current; requires low-inductance connection to minimize ground bounce. |
| 10 (Q1) | True output | 3-state output reflecting D1 state when OE = L and CLK↑ occurred; high-Z when OE = H. |
| 11–18 (Q2–Q8) | True outputs | Individually controlled 3-state outputs mirroring respective D inputs; all share common OE control. |
| 19 (OE) | Output-enable input | Active-low control: OE = L enables outputs; OE = H forces all Qx to high-impedance regardless of CLK/D state. |
| 20 (VCC) | Power supply | 5 V nominal supply; requires local 0.1 μF ceramic bypass capacitor placed adjacent to pin 20. |
| CLK (14) | Clock input | Rising-edge sensitive; triggers simultaneous latching of all eight D inputs to corresponding Q outputs. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-triggered latch architecture | Single-cycle synchronization of eight parallel data bits on CLK rising edge - eliminates metastability risk in multi-bit register transfers. |
| High-current 3-state outputs | ±6 mA drive capability per output - supports direct connection to heavily loaded data buses without external drivers or termination resistors. |
| TTL-compatible input thresholds | VIH = 2.0 V min, VIL = 0.8 V max - ensures interoperability with legacy 5 V TTL logic families without level translation. |
| Low static power consumption | ICC ≤ 80 μA max - enables use in power-sensitive register banks where standby current impacts system-level efficiency. |
| Bus-friendly output control | OE pin disables all outputs to high-Z simultaneously - prevents bus contention during read/write arbitration in shared-data-path systems. |
Applications
| Industrial I/O Port Expansion | Microcontroller Data Bus Buffering |
|---|---|
|
Use Scenario: Expanding GPIO count on PLC backplanes using multiplexed address/data buses. IC Role / Device Role / Timing Role: Acts as a synchronized input latch and output driver, isolating MCU from bus capacitance while enabling parallel data capture on CLK↑. Use Value: Eliminates need for discrete buffers or pull-up networks; 6 mA drive sustains signal integrity across 15 cm PCB traces loaded with 10+ nodes. |
Use Scenario: Interfacing 8-bit microcontrollers (e.g., PIC16F, 8051 derivatives) to external memory or peripheral ICs. IC Role / Device Role / Timing Role: Provides registered data path between MCU data bus and peripheral device, synchronizing handshaking signals with CLK edge. Use Value: Enables deterministic timing margins: 23 ns tsu and 10 ns thh align cleanly with 25 MHz bus clocks, reducing timing closure effort. |
| Bidirectional System Bus Driver | Working Register for Control Logic |
|
Use Scenario: Implementing half-duplex communication between two FPGA domains sharing a single 8-bit data channel. IC Role / Device Role / Timing Role: Functions as direction-controlled buffer: OE controls bus ownership, CLK captures incoming data or releases stored data. Use Value: High-impedance state prevents signal contention; ±6 mA drive ensures fast edge rates even with 50 pF net capacitance. |
Use Scenario: Storing configuration bits for analog front-end calibration or sensor offset compensation in embedded instrumentation. IC Role / Device Role / Timing Role: Serves as nonvolatile shadow register - retains last-latched value during OE high, allowing background updates without bus disruption. Use Value: Low 80 μA ICC minimizes quiescent power draw in battery-backed subsystems; TTL-compatible inputs simplify control from supervisory logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop with 3-state output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT574NSR | Identical pinout and DC specs, but includes separate OE per byte (two 4-bit groups); tpd = 24 ns max. | Better suited for split-bus architectures requiring independent enable control of upper/lower nibbles. | Select SN74HCT574NSR only if byte-level output isolation is required; otherwise SN74HCT374NSR offers simpler control. |
| 74ACT374MTCX | Higher speed (tpd = 9 ns typ), wider VCC range (4.5–5.5 V), but higher ICC (4 mA typ) and no industrial temp rating (0–70°C only). | Applicable in commercial-speed-critical designs where power and temperature range are secondary. | Choose 74ACT374MTCX only for sub-10 ns timing paths; SN74HCT374NSR remains preferred for industrial-grade reliability and low ICC. |
Compared with SN74HCT574NSR and 74ACT374MTCX, SN74HCT374NSR provides optimal balance of industrial temperature support, ultra-low static current, and proven bus-driving capability - making it the default choice for robust, cost-sensitive 5 V register applications.
Availability
SN74HCT374NSR is available at Aetrix Electronics and suitable for industrial I/O expansion, microcontroller bus interfacing, bidirectional data routing, and working register implementation requiring stable component supply across long-lifecycle embedded programs.
Supply support for SN74HCT374NSR 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 50 years of innovation in industrial-grade logic families.
The SN74HCT374NSR belongs to TI's HCT logic series - designed specifically for TTL-compatible 5 V systems requiring low power, high noise immunity, and robust bus-driving capability in harsh environments.
FAQ
What is the maximum clock frequency supported by SN74HCT374NSR?
The SN74HCT374NSR supports up to 25 MHz maximum clock frequency at VCC = 5.5 V and TA = 25°C, as specified in the switching characteristics table. At 4.5 V, the maximum clock rate drops to 21 MHz. These values assume CL = 50 pF load and account for guaranteed timing margins across the full industrial temperature range (−40°C to +85°C). The SN74HCT374NSR datasheet confirms fmax is measured with 50% duty cycle input.
Does SN74HCT374NSR require external pull-up resistors on its outputs?
No, SN74HCT374NSR does not require external pull-up resistors on its outputs. Its ±6 mA output drive capability at 5 V enables direct connection to standard LSTTL loads (up to 15 units), and its 3-state outputs enter high-impedance when OE is high - eliminating bus contention without passive components. The device's design explicitly targets "bus lines without interface or pullup components," as stated in the official TI datasheet description.
What is the function of the OE pin on SN74HCT374NSR?
The OE (output-enable) pin on SN74HCT374NSR is an active-low control that places all eight Q outputs into high-impedance state when asserted high, regardless of CLK or D input states. It does not affect internal flip-flop operation - data latched on previous CLK↑ edges remains retained. This allows safe bus sharing and dynamic output arbitration in multi-master systems, as confirmed in the device functional modes table and detailed description section of the SN74HCT374NSR datasheet.
Is SN74HCT374NSR compatible with 3.3 V logic inputs?
No, SN74HCT374NSR is not reliably compatible with 3.3 V logic inputs. Its input thresholds are TTL-compatible: VIH = 2.0 V min and VIL = 0.8 V max at VCC = 4.5–5.5 V. While a 3.3 V high-level signal may exceed 2.0 V, noise margin is marginal and not guaranteed across temperature and process variation. For mixed-voltage systems, level-shifting or a 3.3 V–tolerant alternative (e.g., SN74LVC374A) is recommended instead of relying on SN74HCT374NSR for 3.3 V input interfacing.
What package type is used for SN74HCT374NSR?
SN74HCT374NSR uses the SOP-20 (Small Outline Package) with 20 gull-wing leads, 15.00 mm × 5.30 mm body dimensions, and 1.27 mm lead pitch. It is RoHS-compliant with NiPdAu lead finish, MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH), and qualified for −40°C to +85°C operation. This package is distinct from SOIC (DW), SSOP (DB), or TSSOP (PW) variants and is explicitly listed in TI's orderable addendum for SN74HCT374NSR.
SN74HCT374NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 40 MHz
- Max Propagation Delay @ V, Max CL:
- 41ns @ 5.5V, 150pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74HCT374NSR FAQ
1.How can I place an order for SN74HCT374NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT374NSR 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 SN74HCT374NSR reliable?
The price and inventory of SN74HCT374NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT374NSR is usually 5 days.
3.What payment methods are accepted for SN74HCT374NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT374NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCT374NSR?
SN74HCT374NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT374NSR 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 SN74HCT374NSR?
For technical support, including SN74HCT374NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT374NSR requirements.
6.How does Aetrix verify that SN74HCT374NSR is sourced from the original manufacturer or authorized distributors?
All SN74HCT374NSR 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 SN74HCT374NSR meets industry standards.
7.What is the process for return or replacement of SN74HCT374NSR?
All SN74HCT374NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT374NSR, 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 SN74HCT374NSR part is unused and in its original packaging.
Return procedure for SN74HCT374NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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