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Texas Instruments SN74HC374NG4
- Part No.:
- SN74HC374NG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74HC374NG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,082
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Product details
Overview
SN74HC374NG4 from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for bus interface and data latching in digital systems. It operates across 2 V to 6 V, delivers ±6 mA output drive at 5 V, exhibits typical propagation delay of 14 ns, and consumes ≤80 µA ICC - enabling robust I/O port buffering in industrial control and instrumentation.
For engineers reviewing the SN74HC374NG4 datasheet, SN74HC374NG4 pinout, SN74HC374NG4 application, or SN74HC374NG4 equivalent, key selection criteria include its 20-pin PDIP package, positive-edge clock triggering, independent 3-state output enable (OE), and compatibility with LSTTL loads up to 15 units without external pull-ups.
Technical Context
This device integrates eight identical D-type flip-flops sharing a common clock (CLK) and output-enable (OE) control. Each flip-flop captures the logic state at its D input on the rising edge of CLK and holds it until the next active clock transition. OE operates asynchronously to place all Q outputs into high-impedance mode without affecting internal latch states.
The architecture supports full parallel data loading and bidirectional bus driving. Its CMOS design ensures low static power consumption while maintaining TTL-compatible voltage thresholds and robust noise immunity across the full 2–6 V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - enables direct interfacing with mixed-voltage logic domains including 3.3 V and 5 V systems. |
| Propagation Delay (tpd) | 14 ns typical at VCC = 4.5 V - supports reliable operation up to 24 MHz clock frequency in buffered data paths. |
| Output Drive Strength | ±6 mA at 5 V - directly drives 15 LSTTL loads without external buffers or pull-up resistors. |
| Quiescent Current (ICC) | 80 µA max - minimizes standby power in battery-backed or energy-sensitive applications. |
| Input Leakage Current | 1 µA max - ensures stable logic levels even with high-impedance source signals or floating inputs. |
| Setup/Hold Times | tsu = 25 ns, th = 5 ns at VCC = 4.5 V - defines minimum data stability window before/after CLK edge for reliable sampling. |
Pinout & Package
SN74HC374NG4 is supplied in a 20-pin plastic dual in-line package (PDIP), body size 25.40 mm × 6.35 mm, with standard through-hole mounting and 0.1-inch lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–8, 13–20 | D₀–D₇ / Q₀–Q₇ | Data inputs and corresponding latched outputs - arranged in mirrored pairs for compact PCB routing in register files. |
| 9 | GND | Ground reference for all internal circuitry and output drivers - must be low-impedance connection to minimize switching noise. |
| 10 | CLK | Positive-edge-triggered clock input - initiates simultaneous capture of all eight D inputs into respective flip-flops. |
| 11 | OE | Active-low 3-state output enable - asserts high-impedance on all Q outputs when high, allowing shared bus arbitration. |
| 12 | VCC | Power supply input - requires local 0.1 µF bypass capacitor to suppress supply transients during output transitions. |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Outputs | Enables direct connection to shared data buses without external isolation components or pull-up networks. |
| High-Current Drive | ±6 mA per output at 5 V eliminates need for buffer ICs when interfacing with legacy LSTTL peripherals. |
| Low Input Current | ≤1 µA max allows direct connection to high-impedance sources such as microcontroller GPIOs or analog switches. |
| Wide Supply Range | 2–6 V operation supports interoperability across 3.3 V FPGA I/O banks and 5 V legacy controllers without level shifters. |
Applications
| Industrial PLC I/O Module | Microcontroller Parallel Interface |
|---|---|
Use Scenario: Isolating and latching sensor status bits from multiple field devices onto a shared backplane bus. IC Role / Device Role / Timing Role: SN74HC374NG4 acts as an output register, capturing real-time I/O states on each rising CLK edge synchronized to the PLC scan cycle. Use Value: Enables deterministic timing control over 8-bit data acquisition with minimal board space and zero external passive components. | Use Scenario: Expanding GPIO count of an ARM Cortex-M4 MCU to drive an 8-bit LCD segment controller. IC Role / Device Role / Timing Role: SN74HC374NG4 serves as a parallel output latch, holding display data stable while the MCU prepares next frame. Use Value: Provides glitch-free data handoff between fast MCU core and slower peripheral, eliminating software wait states. |
| Test Equipment Digital Pattern Generator | Legacy Bus Interface Adapter |
Use Scenario: Generating precise, synchronized digital stimulus waveforms for IC functional testing. IC Role / Device Role / Timing Role: SN74HC374NG4 functions as a pattern register, clocked by a programmable timing engine to output deterministic bit sequences. Use Value: Delivers sub-15 ns edge accuracy and rail-to-rail logic swing essential for high-fidelity digital stimulus generation. | Use Scenario: Bridging modern microcontrollers to legacy ISA or PC/104 expansion slots requiring 5 V TTL-level data transfer. IC Role / Device Role / Timing Role: SN74HC374NG4 operates as a bidirectional bus driver, using OE to manage direction control and isolate mismatched voltage domains. Use Value: Eliminates level-shifter ICs and discrete transistor arrays, reducing BOM cost and layout complexity in retro-compatibility designs. |
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); identical 3-state outputs and pinout. | Better suited for mixed 5 V TTL/CMOS systems where input noise margins are critical. | Select SN74HCT374N when interfacing directly with legacy 5 V TTL outputs without level translation. |
| 74AC374PC | Faster tpd = 9 ns typical at 5 V; higher ICC = 40 mA max; same 20-pin PDIP footprint. | Preferred in high-speed data acquisition where setup/hold timing budgets are tighter. | Choose 74AC374PC only if system clock exceeds 30 MHz and supply can support higher dynamic current. |
Compared with SN74HCT374N and 74AC374PC, SN74HC374NG4 offers optimal balance of low power (80 µA ICC), wide supply range (2–6 V), and proven reliability in long-lifecycle industrial designs - making it ideal for cost-sensitive, thermally constrained, or multi-voltage embedded applications.
Availability
SN74HC374NG4 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, microcontroller parallel interfaces, test equipment pattern generators, and legacy bus interface adapters requiring stable component supply and long-term manufacturability.
Supply support for SN74HC374NG4 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, automotive, and communications markets.
SN74HC374NG4 belongs to TI's HC (High-Speed CMOS) logic family, engineered for low-power, pin-compatible replacements of legacy TTL devices while delivering enhanced noise immunity and wider operating voltage flexibility.
FAQ
What is the maximum clock frequency supported by SN74HC374NG4?
SN74HC374NG4 supports a maximum clock frequency of 24 MHz at VCC = 4.5 V and TA = 25 °C, as specified in the switching characteristics table. At 6 V supply, fmax increases to 28 MHz under identical conditions. These values assume CL = 50 pF load and proper PCB layout with decoupling.
Does SN74HC374NG4 require external pull-up resistors on its outputs?
No - SN74HC374NG4 does not require external pull-up resistors on its outputs due to its high-current 3-state drivers (±6 mA at 5 V), which actively drive both logic high and low levels. Pull-ups are only needed on OE if active-low assertion must be guaranteed during power-up.
Can SN74HC374NG4 operate reliably at 3.3 V supply voltage?
Yes - SN74HC374NG4 is fully specified down to 2 V supply and operates reliably at 3.3 V. At this voltage, VOH ≥ 3.15 V and VOL ≤ 0.1 V under 6 mA load, ensuring robust noise margins when interfacing with 3.3 V microcontrollers and FPGAs.
What is the function of the OE pin on SN74HC374NG4?
The OE (output enable) pin on SN74HC374NG4 is an active-low control that places all eight Q outputs into high-impedance state when asserted high. It operates asynchronously and does not affect internal flip-flop states, enabling safe bus sharing without data corruption.
Is SN74HC374NG4 RoHS compliant?
Yes - SN74HC374NG4 is RoHS compliant, as confirmed in TI's official packaging addendum. It features NiPdAu (NIPDAU) lead finish, Level-1 moisture sensitivity rating, and meets JEDEC J-STD-020 reflow profile requirements for lead-free assembly.
SN74HC374NG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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:
- 31ns @ 6V, 50pF
- 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
SN74HC374NG4 FAQ
1.How can I place an order for SN74HC374NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC374NG4 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 SN74HC374NG4 reliable?
The price and inventory of SN74HC374NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC374NG4 is usually 5 days.
3.What payment methods are accepted for SN74HC374NG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC374NG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC374NG4?
SN74HC374NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC374NG4 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 SN74HC374NG4?
For technical support, including SN74HC374NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC374NG4 requirements.
6.How does Aetrix verify that SN74HC374NG4 is sourced from the original manufacturer or authorized distributors?
All SN74HC374NG4 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 SN74HC374NG4 meets industry standards.
7.What is the process for return or replacement of SN74HC374NG4?
All SN74HC374NG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC374NG4, 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 SN74HC374NG4 part is unused and in its original packaging.
Return procedure for SN74HC374NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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