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Texas Instruments SN74HC374NE4
- Part No.:
- SN74HC374NE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74HC374NE4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,390
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Product details
Overview
SN74HC374NE4 from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs in a 20-pin PDIP package, operating from 2 V to 6 V supply, delivering ±6-mA output drive at 5 V, 14 ns typical propagation delay, and 80-µA max ICC. It serves as a bidirectional bus driver or I/O port register in industrial control and data acquisition systems.
For engineers reviewing the SN74HC374NE4 datasheet, SN74HC374NE4 pinout, SN74HC374NE4 application, or SN74HC374NE4 equivalent, key selection criteria include its 3-state output enable timing (ten/tdis ≤32 ns at 6 V), wide voltage range compatibility, and direct replacement suitability for legacy HC-series buffer registers requiring high-current drive and low-power operation.
Technical Context
The SN74HC374NE4 implements eight independent D-type latches triggered on the rising edge of CLK, with asynchronous 3-state control via OE. Its CMOS architecture ensures rail-to-rail logic levels and low input current (≤1 µA), enabling direct interfacing with microcontroller GPIOs and legacy TTL loads.
Each flip-flop retains stored data during OE assertion, allowing concurrent bus arbitration and register update without output contention. The device supports capacitive bus loading up to 15 LSTTL units and operates across –40°C to +85°C, meeting industrial temperature requirements without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - enables interoperability with 3.3 V and 5 V logic families without level shifters. |
| Propagation Delay (tpd) | 15 ns at 6 V - ensures sub-20 ns timing margin for 25 MHz synchronous bus interfaces. |
| Output Drive Strength | ±6 mA at 5 V - directly drives 15 LSTTL loads, eliminating external buffer stages in I/O expansion designs. |
| Quiescent Current (ICC) | 80 µA max - supports low-power standby modes in battery-backed or energy-sensitive applications. |
| 3-State Enable/Disable Time | 32 ns (ten/tdis) at 6 V - guarantees clean bus release before next data cycle in multiplexed memory or peripheral interfaces. |
| Input Capacitance (Ci) | 10 pF - minimizes signal integrity degradation on high-speed clock and data lines. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems without thermal management overhead. |
Pinout & Package
SN74HC374NE4 uses a 20-pin Plastic Dual In-line Package (PDIP) with 25.40 mm × 6.35 mm body size and through-hole mounting. Pin 1 is located at the left end of the top row, identified by a notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Data Inputs (D1–D8) | Asynchronous parallel data inputs synchronized to CLK rising edge; must be stable ≥21 ns before clock (tsu) and held ≥5 ns after (th). |
| 9 | Ground (GND) | Reference return path for all internal logic and output drivers; requires low-inductance connection to system ground plane. |
| 10 | Output Enable (OE) | Active-low control: logic low enables Q outputs; logic high places all Q pins in high-impedance state - no effect on internal latch state. |
| 11, 13, 14, 15, 16, 17, 18, 19 | Outputs (Q1–Q8) | 3-state buffered outputs reflecting D-input values captured at last CLK↑; sink/source ±6 mA at 5 V with VOL ≤0.33 V and VOH ≥3.7 V. |
| 12 | Power Supply (VCC) | Primary supply rail (2–6 V); requires local 0.1-µF ceramic bypass capacitor placed within 5 mm of pin for noise suppression. |
| 20 | Clock Input (CLK) | Rising-edge sensitive trigger; accepts input transition times ≤400 ns (at 6 V) and drives internal latch synchronously across all eight channels. |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type latch with 3-state outputs | Enables single-package implementation of 8-bit bidirectional data buffers, reducing PCB footprint vs. discrete gate solutions. |
| Wide 2–6 V supply range | Eliminates need for separate voltage regulators when interfacing mixed-voltage subsystems (e.g., 3.3 V MCU with 5 V peripherals). |
| High-current 3-state outputs | Drives up to 15 LSTTL loads directly, supporting legacy backplane and ISA-style bus architectures without external drivers. |
| Low power consumption (80 µA max ICC) | Reduces thermal load in dense logic arrays and extends battery life in portable instrumentation with periodic sampling. |
| Full parallel access for loading | Allows simultaneous capture of 8-bit data on one clock edge, simplifying firmware for parallel ADC/DAC interfaces and display controllers. |
Applications
| Industrial PLC I/O Expansion | Legacy Bus Interface Adapter |
|---|---|
|
Use Scenario: Adding isolated digital input/output capability to programmable logic controllers using 24 V field signals and 5 V logic rails. IC Role / Device Role / Timing Role: SN74HC374NE4 acts as an 8-bit input latch and output driver, capturing sensor status on CLK and driving solenoid/relay control lines via OE-gated 3-state outputs. Use Value: Enables deterministic scan-cycle timing with 15 ns setup/hold margins and eliminates external pull-up networks due to active-drive capability. |
Use Scenario: Bridging modern microcontrollers to legacy ISA or PC/104 peripheral cards requiring 8-bit parallel data transfer with handshaking. IC Role / Device Role / Timing Role: SN74HC374NE4 serves as a bidirectional bus transceiver, latching CPU writes on CLK↑ and presenting reads to data bus under OE control. Use Value: Provides glitch-free bus isolation with <32 ns enable/disable transitions, preventing address/data corruption during bus arbitration. |
| Microcontroller Parallel Port Extension | Test Equipment Digital Pattern Generator |
|
Use Scenario: Expanding limited GPIO count on ARM Cortex-M or RISC-V SoCs for driving LED matrices, keypad scanners, or stepper motor controllers. IC Role / Device Role / Timing Role: SN74HC374NE4 functions as an output port register, storing firmware-generated byte values and updating all 8 outputs simultaneously on each CLK pulse. Use Value: Delivers ±6 mA per pin to directly drive LEDs or small relays without current-limiting resistors or transistor arrays. |
Use Scenario: Generating precise, repeatable digital stimulus waveforms for IC functional testing and boundary-scan validation. IC Role / Device Role / Timing Role: SN74HC374NE4 operates as a static pattern register, holding test vectors while OE controls output assertion timing relative to clock edges. Use Value: Guarantees sub-20 ns propagation consistency across all 8 bits, ensuring skew-controlled waveform generation for high-speed digital verification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT374N | TTL-compatible input thresholds (VIH = 2 V min), higher ICC (4 mA typ), identical pinout and timing. | Better suited for mixed 5 V TTL/CMOS systems where input noise immunity is critical; not recommended for 3.3 V-only designs. | Select SN74HCT374N when interfacing with legacy 5 V TTL outputs; otherwise prefer SN74HC374NE4 for lower power and wider voltage flexibility. |
| 74ACT374PC | Faster tpd (8 ns at 5 V), higher drive (24 mA), 5 V only supply, different pinout (SOIC-20 vs. PDIP-20). | Targeted at high-speed bus applications requiring <10 ns timing; incompatible with through-hole layouts and 3.3 V domains. | Choose 74ACT374PC only for performance-critical 5 V systems with SOIC footprint; SN74HC374NE4 remains optimal for cost-sensitive, mixed-voltage, or through-hole designs. |
Compared with SN74HCT374N and 74ACT374PC, SN74HC374NE4 offers the broadest supply range (2–6 V), lowest quiescent power (80 µA), and PDIP packaging for prototyping and industrial repair - making it the most versatile choice for general-purpose 8-bit latching where speed beyond 25 MHz is unnecessary.
Availability
SN74HC374NE4 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface adapters, microcontroller parallel port extension, and test equipment digital pattern generators requiring stable component supply and long-term obsolescence management.
Supply support for SN74HC374NE4 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 SN74HC374NE4 belongs to TI's 74HC logic family, designed for robust, low-power, wide-voltage-range digital interfacing in industrial control, instrumentation, and legacy system upgrades.
FAQ
What is the maximum clock frequency supported by SN74HC374NE4 at 5 V?
At 5 V supply and 25°C, SN74HC374NE4 supports a maximum clock frequency of 24 MHz under recommended operating conditions. This is derived from the minimum CLK pulse width (tw) of 20 ns high and 20 ns low, ensuring reliable edge-triggered operation without metastability. The device maintains this rating across its full industrial temperature range (–40°C to +85°C) with appropriate timing margins.
Can SN74HC374NE4 operate reliably at 3.3 V supply voltage?
Yes, SN74HC374NE4 is fully specified for operation at 3.3 V. Its wide 2–6 V supply range includes 3.3 V as a standard operating point, with guaranteed parameters including VIH = 2.31 V (min), VOL = 0.33 V (max at 6 mA), and tpd = 38 ns (max). No external level shifting is required when interfacing with 3.3 V microcontrollers or FPGAs.
How does the output-enable (OE) pin affect internal latch behavior in SN74HC374NE4?
The OE pin in SN74HC374NE4 has no effect on internal latch operation: data continues to be captured on every CLK rising edge regardless of OE state. When OE is high, outputs go high-impedance but stored Q values remain unchanged, allowing new data to be loaded and retained for later bus assertion - a key feature for non-blocking register updates in real-time systems.
What is the recommended bypass capacitor for SN74HC374NE4 and where should it be placed?
A 0.1-µF ceramic capacitor is recommended for SN74HC374NE4, placed between VCC (pin 12) and GND (pin 9) as close as possible - ideally within 5 mm - to minimize inductance. For noisy environments, paralleling with a 1-µF capacitor improves low-frequency decoupling. This configuration suppresses switching noise and prevents supply droop during simultaneous 3-state output transitions.
Is SN74HC374NE4 pin-compatible with other members of the 74HC374 family?
Yes, SN74HC374NE4 shares identical pinout and electrical characteristics with all 74HC374 variants (e.g., SN74HC374DWR, SN74HC374PWR) across PDIP, SOIC, TSSOP, and SSOP packages. The N suffix denotes PDIP packaging, and the E4 suffix indicates TI's standard RoHS-compliant lead finish (NIPDAU); functionally, all versions are interchangeable in circuit design.
SN74HC374NE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 70 MHz
- Max Propagation Delay @ V, Max CL:
- 39ns @ 6V, 150pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74HC374NE4 FAQ
1.How can I place an order for SN74HC374NE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC374NE4 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 SN74HC374NE4 reliable?
The price and inventory of SN74HC374NE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC374NE4 is usually 5 days.
3.What payment methods are accepted for SN74HC374NE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC374NE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC374NE4?
SN74HC374NE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC374NE4 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 SN74HC374NE4?
For technical support, including SN74HC374NE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC374NE4 requirements.
6.How does Aetrix verify that SN74HC374NE4 is sourced from the original manufacturer or authorized distributors?
All SN74HC374NE4 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 SN74HC374NE4 meets industry standards.
7.What is the process for return or replacement of SN74HC374NE4?
All SN74HC374NE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC374NE4, 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 SN74HC374NE4 part is unused and in its original packaging.
Return procedure for SN74HC374NE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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