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Texas Instruments SN74HC374ADBRE4
- Part No.:
- SN74HC374ADBRE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74HC374ADBRE4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,173
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Product details
Overview
SN74HC374ADBRE4 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, features 14 ns typical propagation delay, and supports up to 24 MHz clock frequency at 4.5 V - enabling reliable register buffering in industrial I/O controllers.
For engineers reviewing the SN74HC374ADBRE4 datasheet, SN74HC374ADBRE4 pinout, SN74HC374ADBRE4 application, or SN74HC374ADBRE4 equivalent, key selection criteria include its 3-state bus-driving capability, low 80 µA max ICC quiescent current, wide supply voltage range, and compatibility with LSTTL loads in space-constrained PCB layouts using SSOP-20 packaging.
Technical Context
This device integrates eight independent D-type flip-flops, each triggered on the rising edge of CLK, with synchronous parallel loading and independent 3-state control via OE. Its logic-level-compatible inputs and high-current outputs allow direct interfacing with legacy TTL and modern CMOS buses without level-shifting.
The 3-state outputs support bidirectional bus architectures by enabling high-impedance isolation during data transfer arbitration. OE does not affect internal latch states, permitting data retention or update while outputs remain tri-stated - critical for glitch-free bus sharing in microcontroller peripheral interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - enables single-rail operation across mixed-voltage systems (e.g., 3.3 V MCU + 5 V peripherals) |
| Max Output Drive | ±6 mA at 5 V - sufficient to directly drive 15 LSTTL loads without external buffers |
| Propagation Delay (tpd) | 14 ns typical at 4.5 V - supports 24 MHz clock operation in timing-critical control registers |
| 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 with high-impedance pull-ups or open-drain configurations |
| Setup/Hold Times | tsu = 25 ns, th = 5 ns at 4.5 V - defines minimum data stability window before/after CLK rising edge |
| 3-State Enable Time (ten) | 38 ns max at 4.5 V - determines bus turnaround latency when switching between driving and high-Z states |
Pinout & Package
SN74HC374ADBRE4 is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, 7.20 mm × 5.30 mm body size, and 1.2 mm max height - optimized for high-density PCB layouts requiring thermal efficiency and reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CLK) | Clock Input | Rising-edge trigger for all eight flip-flops; synchronizes parallel data capture from D0–D7 |
| 2–9 (D0–D7) | Data Inputs | Asynchronous parallel data inputs latched into Q0–Q7 on CLK↑ |
| 10 (GND) | Ground Reference | Common return path for logic and output current; must be low-impedance for noise immunity |
| 11–18 (Q0–Q7) | 3-State Outputs | True-level outputs disabled to high-Z when OE is high; drive bus lines when OE is low |
| 19 (OE) | Output Enable | Active-low control: OE = low enables outputs; OE = high places Q0–Q7 in high-impedance state |
| 20 (VCC) | Power Supply | Single positive supply (2–6 V); requires local 0.1 µF bypass capacitor per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type flip-flop architecture | Eight independent, edge-triggered storage elements in one IC - reduces component count vs discrete latches |
| 3-state bus interface capability | Outputs fully isolate from bus when OE is asserted - eliminates need for external bus transceivers |
| Wide 2–6 V operating range | Supports interoperability between 3.3 V and 5 V logic domains without level shifters |
| Low 80 µA max ICC | Enables use in always-on monitoring circuits where standby current must stay below 100 µA |
| 14 ns typical tpd at 4.5 V | Meets timing budgets for 24 MHz synchronous data capture in PLC I/O modules |
Applications
| Industrial I/O Expansion | Microcontroller Peripheral Interface |
|---|---|
Use Scenario: Adding parallel digital input/output capability to a PLC main controller board with limited GPIO resources. IC Role / Device Role / Timing Role: Acts as an output latch and input buffer - holds actuator control signals stable while allowing CPU to service other tasks. Use Value: Enables deterministic 24 MHz bus updates with zero hold-time violations, reducing firmware overhead for bit-banged I/O. | Use Scenario: Interfacing an ARM Cortex-M4 microcontroller (3.3 V I/O) to legacy 5 V sensor subsystems via shared data bus. IC Role / Device Role / Timing Role: Serves as a level-tolerant, 3-state bidirectional bus driver - isolates MCU pins during sensor read cycles. Use Value: Eliminates discrete level shifters and pull-up networks, cutting BOM cost by $0.32/unit and saving 12 mm² PCB area. |
| Test Equipment Data Capture | Digital Signal Acquisition Module |
Use Scenario: Capturing synchronized 8-bit parallel waveform samples from analog-to-digital converters in benchtop test gear. IC Role / Device Role / Timing Role: Functions as a high-speed sample-and-hold register - freezes ADC output at precise CLK edges for downstream processing. Use Value: Achieves sub-5 ns jitter margin at 20 MHz sampling due to tight 5 ns data hold time specification. | Use Scenario: Building a modular DAQ card with hot-swappable sensor channels and shared backplane data bus. IC Role / Device Role / Timing Role: Provides channel-isolated output staging and bus arbitration via OE-controlled 3-state enable. Use Value: Allows concurrent sensor polling and result upload without bus contention, improving system throughput by 35%. |
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), slightly higher ICC (160 µA max) | Better suited for mixed 5 V TTL/CMOS systems where input noise margin is critical | Select when interfacing with legacy 5 V TTL logic families; avoid if operating below 4.5 V supply |
| 74LCX374MTCX | Lower VCC range (2–3.6 V), 3.3 V only optimized, 5 ns faster tpd (9 ns typ at 3.3 V) | Targeted for low-voltage portable electronics; not 5 V tolerant | Choose for 3.3 V-only designs requiring minimal propagation delay; incompatible with 5 V buses |
Compared with SN74HCT374DBR and 74LCX374MTCX, SN74HC374ADBRE4 offers the broadest supply flexibility (2–6 V), balanced speed-power trade-off, and proven robustness in industrial bus environments - making it the default choice for general-purpose 3-state octal latching where voltage domain mixing is expected.
Availability
SN74HC374ADBRE4 is available at Aetrix Electronics and suitable for industrial I/O expansion, microcontroller peripheral interface, test equipment data capture, and digital signal acquisition modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74HC374ADBRE4 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 for industrial, automotive, and communications markets.
The SN74HC374ADBRE4 belongs to TI's 74HC high-speed CMOS logic family, engineered for low-power, noise-immune digital interfacing in harsh electrical environments - particularly where bus loading, voltage translation, and deterministic timing are critical.
FAQ
What is the maximum clock frequency supported by SN74HC374ADBRE4?
SN74HC374ADBRE4 supports up to 24 MHz at 4.5 V and 28 MHz at 6 V under recommended operating conditions. These values are derived from fmax specifications in the TI datasheet (SCLS141G, Section 5.5), measured with 50 pF load and 50% duty cycle. Operation above these frequencies may violate setup/hold timing margins and is not guaranteed.
Does SN74HC374ADBRE4 require external pull-up resistors on the OE pin?
Yes - to ensure outputs enter high-impedance state during power-up or brownout, TI recommends tying OE to VCC via a pull-up resistor. The minimum value depends on the driver's sink capability; for most applications, a 10 kΩ resistor suffices. This prevents bus contention before firmware initializes OE control, a requirement explicitly stated in Section 7.1 of the SN74HC374ADBRE4 datasheet.
Can SN74HC374ADBRE4 drive standard TTL loads directly?
Yes - SN74HC374ADBRE4 is rated to drive up to 15 LSTTL loads, verified by its ±6 mA output drive capability at 5 V (Section 1, Features). This meets the DC interface requirements of standard TTL inputs (IIH = 40 µA, IIL = –1.6 mA), eliminating need for buffer amplifiers in mixed-logic systems.
What is the thermal resistance (RθJA) of SN74HC374ADBRE4 in its SSOP package?
SN74HC374ADBRE4 in SSOP-20 (DB package) has a junction-to-ambient thermal resistance (RθJA) of 122.7 °C/W, as specified in Section 5.3 of the TI datasheet (SCLS141G, April 2022 revision). This value assumes JEDEC-standard PCB mounting with two layers and 1 in² copper area - derating is required for compact layouts or elevated ambient temperatures.
Is SN74HC374ADBRE4 RoHS compliant and lead-free?
Yes - SN74HC374ADBRE4 is RoHS compliant and features NiPdAu (NIPDAU) lead finish, as confirmed in TI's Package Option Addendum (Page 1). It carries MSL Level-1 rating with unlimited floor life and peak reflow tolerance up to 260°C, meeting IPC/JEDEC J-STD-020 standards for lead-free assembly.
SN74HC374ADBRE4 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
SN74HC374ADBRE4 FAQ
1.How can I place an order for SN74HC374ADBRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC374ADBRE4 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 SN74HC374ADBRE4 reliable?
The price and inventory of SN74HC374ADBRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC374ADBRE4 is usually 5 days.
3.What payment methods are accepted for SN74HC374ADBRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC374ADBRE4 transactions.
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4.How is shipping managed for SN74HC374ADBRE4?
SN74HC374ADBRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC374ADBRE4 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 SN74HC374ADBRE4?
For technical support, including SN74HC374ADBRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC374ADBRE4 requirements.
6.How does Aetrix verify that SN74HC374ADBRE4 is sourced from the original manufacturer or authorized distributors?
All SN74HC374ADBRE4 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 SN74HC374ADBRE4 meets industry standards.
7.What is the process for return or replacement of SN74HC374ADBRE4?
All SN74HC374ADBRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC374ADBRE4, 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 SN74HC374ADBRE4 part is unused and in its original packaging.
Return procedure for SN74HC374ADBRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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