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Texas Instruments SN74HC374ADBRG4
- Part No.:
- SN74HC374ADBRG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74HC374ADBRG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,164
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Product details
Overview
SN74HC374ADBRG4 from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, operating across 2 V to 6 V. It features eight independent D-flip-flops synchronized on the rising clock edge, ±6-mA output drive at 5 V, 14 ns typical propagation delay, and low 80-µA max ICC-ideal for bidirectional bus driving in industrial I/O port expansion.
For engineers reviewing the SN74HC374ADBRG4 datasheet, SN74HC374ADBRG4 pinout, SN74HC374ADBRG4 application, or SN74HC374ADBRG4 equivalent, key selection criteria include 3-state output timing (ten/tdis ≤32 ns at 6 V), wide supply range compatibility, and SOIC-20 package thermal performance (RθJA = 109.1°C/W).
Technical Context
This device implements eight synchronous D-type latches with positive-edge clock triggering and independent 3-state output control via OE. Each flip-flop captures D-input logic on CLK↑ and holds state until the next active clock edge, while OE enables high-impedance output mode without affecting internal register operation.
Designed for bus-oriented systems, it supports capacitive loads up to 15 LSTTL units and delivers rail-to-rail logic levels with VIH/VIL thresholds defined across 2–6 V supply. Timing parameters-including tsu = 21 ns, th = 5 ns, and tpd = 38 ns (CL = 50 pF, VCC = 6 V)-are fully characterized over –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | High-speed CMOS (HC), compatible with TTL input thresholds and 5-V systems |
| Supply Voltage Range | 2 V to 6 V - enables direct interface with mixed-voltage microcontrollers and legacy 5-V buses |
| Propagation Delay (tpd) | 38 ns max at VCC = 6 V, CL = 50 pF - ensures reliable timing margin in 24-MHz bus applications |
| Output Drive Strength | ±6 mA at 5 V - sufficient to directly drive 15 LSTTL loads without external buffers |
| Quiescent Current (ICC) | 80 µA max - supports low-power standby modes in battery-backed I/O expanders |
| 3-State Enable/Disable Time | ten = 32 ns, tdis = 32 ns at VCC = 6 V - minimizes bus contention during hot-swap or multiplexed data transfers |
| Input Leakage Current | ±1 µA max - prevents unintended logic transitions when inputs are pulled via high-value resistors |
Pinout & Package
SN74HC374ADBRG4 is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm with standard 0.65-mm lead pitch and 2.65-mm body height. The package is RoHS-compliant, NIPDAU lead-finished, and rated MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1Q–8Q (Pins 1–8, 13–16) | True 3-state outputs | Drive bus lines directly; enter high-Z when OE is high, eliminating need for external pull-ups or bus transceivers |
| 1D–8D (Pins 2–9) | Data inputs | Sampled on rising CLK edge; must be stable for tsu = 21 ns before and th = 5 ns after clock transition |
| CLK (Pin 11) | Clock input | Positive-edge-triggered; accepts slow or fast edges per ∆t/∆v spec (≤400 ns rise/fall at 6 V) |
| OE (Pin 19) | Output enable | Active-low control: OE = low enables outputs; OE = high forces all Qs to high-impedance regardless of CLK/D state |
| VCC (Pin 20), GND (Pin 10) | Power terminals | Require local 0.1-µF ceramic bypass capacitor; layout proximity critical for noise immunity in high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type flip-flop architecture | Eight independent registers share one clock and OE, enabling compact 8-bit latch implementation without discrete logic gates |
| 3-state output control | OE pin provides simultaneous bus release for all eight outputs-critical for shared-data-bus arbitration in PLC backplanes |
| Wide voltage operation (2–6 V) | Eliminates level-shifting circuitry when interfacing 3.3-V MCUs to 5-V peripheral buses or legacy industrial controllers |
| Low power consumption | 80-µA max ICC allows integration into always-on I/O monitoring circuits without thermal derating |
| High noise immunity | VIH/VIL thresholds scale with VCC (e.g., VIH = 4.2 V at 6 V), ensuring robust operation in electrically noisy factory environments |
Applications
| Industrial I/O Expansion | Microcontroller Bus Interface |
|---|---|
|
Use Scenario: Adding parallel digital I/O capability to a PLC main controller using a shared 8-bit data bus. IC Role / Device Role / Timing Role: Acts as an output latch: MCU writes data to SN74HC374ADBRG4, then pulses CLK to capture and hold values; OE controls bus release. Use Value: Eliminates need for discrete buffers or CPLDs-reduces BOM count and PCB area while maintaining deterministic 38-ns output setup. |
Use Scenario: Isolating a 3.3-V ARM Cortex-M4 GPIO bank from a 5-V sensor array requiring precise timing alignment. IC Role / Device Role / Timing Role: Serves as a level-translating latch: 3.3-V MCU drives D inputs; 5-V VCC powers outputs; CLK synchronized to system timer. Use Value: Achieves safe voltage translation without direction-control logic or dual-supply translators-simplifies firmware and reduces signal skew. |
| Test Equipment Data Capture | Legacy System Bus Buffering |
|
Use Scenario: Capturing parallel status signals from 8-channel analog front-end ICs in automated test equipment. IC Role / Device Role / Timing Role: Functions as a synchronous sampling register: CLK aligned to ADC conversion complete pulse; OE used for controlled readout. Use Value: Guarantees atomic snapshot of all 8 channels with <5 ns inter-output skew-enables accurate multi-channel correlation analysis. |
Use Scenario: Interfacing modern FPGA-based controllers to vintage 8-bit ISA bus peripherals in retro-computing restoration projects. IC Role / Device Role / Timing Role: Provides bidirectional bus buffering: OE toggled to switch between FPGA write (OE low) and read (OE high) cycles. Use Value: Matches ISA timing requirements (tPLH/tPHL ≤46 ns) and drives 5-V TTL loads directly-no additional transceiver ICs required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT374DBR | TTL-compatible input thresholds (VIH = 2 V min); identical pinout and timing | Better suited for mixed 5-V TTL/CMOS systems where input noise margins are marginal | Choose when interfacing legacy TTL logic without level shifters |
| 74LCX374MTCX | Lower VCC range (2–3.6 V), higher speed (tpd = 5.5 ns @ 3.3 V), different SOIC-20 footprint | Optimized for 3.3-V-only embedded systems with tight timing budgets | Prefer for new 3.3-V designs requiring sub-10-ns latency and lower dynamic power |
Compared with SN74HC374ADBRG4, SN74HCT374DBR offers improved noise immunity in noisy 5-V environments but shares identical SOIC-20 packaging and bus-driving capability, whereas 74LCX374MTCX delivers faster performance at 3.3 V but requires board redesign due to non-identical thermal pad and land pattern.
Availability
SN74HC374ADBRG4 is available at Aetrix Electronics and suitable for industrial I/O expansion, microcontroller bus interfacing, test equipment data capture, and legacy system bus buffering requiring stable component supply and long-term production continuity.
Supply support for SN74HC374ADBRG4 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.
SN74HC374ADBRG4 belongs to TI's HC logic family-designed for robust, low-power, pin-compatible replacements of legacy TTL devices in industrial control, instrumentation, and bus-interface applications.
FAQ
What is the maximum clock frequency supported by SN74HC374ADBRG4?
The SN74HC374ADBRG4 supports a maximum clock frequency of 24 MHz at VCC = 6 V and TA = 25°C (CL = 50 pF). At 4.5 V, fmax drops to 20 MHz, and at 2 V it is limited to 4 MHz. These values assume proper signal integrity and meet timing requirements including tsu = 21 ns and th = 5 ns at 6 V.
Does SN74HC374ADBRG4 require external pull-up resistors on the OE pin?
Yes-TI recommends tying OE to VCC through a pull-up resistor during power-up/down to guarantee high-impedance outputs. The minimum resistor value depends on the driver's sink capability; typical values range from 4.7 kΩ to 10 kΩ for standard logic drivers, ensuring OE remains asserted high until firmware initializes the control line.
Can SN74HC374ADBRG4 drive a 50-pF bus capacitance at 20 MHz?
Yes-the SN74HC374ADBRG4 is characterized for CL = 50 pF and delivers tpd = 38 ns and tt = 13 ns at VCC = 6 V, supporting reliable 20-MHz operation. Its ±6-mA drive strength ensures adequate slew rate and settling time, provided PCB trace impedance and termination follow standard 5-V digital layout guidelines.
Is SN74HC374ADBRG4 pin-compatible with SN74HC373N?
No-SN74HC374ADBRG4 uses edge-triggered D-type flip-flops with separate CLK and OE pins, while SN74HC373N is a latch with transparent G (gate) control. Their pinouts differ: SN74HC374ADBRG4 has CLK on Pin 11 and OE on Pin 19; SN74HC373N places G on Pin 11 and OE on Pin 1. Functional replacement requires schematic and firmware changes.
What is the thermal resistance (RθJA) of SN74HC374ADBRG4 in its SOIC package?
The SN74HC374ADBRG4 in SOIC-20 (DW) package has a junction-to-ambient thermal resistance RθJA of 109.1°C/W, measured under JEDEC JESD51-2 conditions. This value assumes a standard 2-layer PCB with 1-in² copper pour; actual thermal performance improves with enhanced copper area or thermal vias beneath the package.
SN74HC374ADBRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74HC374ADBRG4 FAQ
1.How can I place an order for SN74HC374ADBRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC374ADBRG4 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 SN74HC374ADBRG4 reliable?
The price and inventory of SN74HC374ADBRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC374ADBRG4 is usually 5 days.
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Once your SN74HC374ADBRG4 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 SN74HC374ADBRG4?
For technical support, including SN74HC374ADBRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC374ADBRG4 requirements.
6.How does Aetrix verify that SN74HC374ADBRG4 is sourced from the original manufacturer or authorized distributors?
All SN74HC374ADBRG4 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 SN74HC374ADBRG4 meets industry standards.
7.What is the process for return or replacement of SN74HC374ADBRG4?
All SN74HC374ADBRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC374ADBRG4, 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 SN74HC374ADBRG4 part is unused and in its original packaging.
Return procedure for SN74HC374ADBRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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