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Texas Instruments SN74AHCT374DBR
- Part No.:
- SN74AHCT374DBR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74AHCT374DBR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,800
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Product details
Overview
SN74AHCT374DBR from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for synchronous data latching and bus interface in 5V digital systems. It operates from 4.5V to 5.5V, delivers 10.5ns propagation delay at 5V/15pF, supports up to 80MHz operation, and features TTL-compatible inputs for seamless integration with legacy logic. It is commonly used in parallel data storage and bidirectional bus driving applications.
For engineers reviewing the SN74AHCT374DBR datasheet, SN74AHCT374DBR pinout, SN74AHCT374DBR application, or SN74AHCT374DBR equivalent, key selection considerations include its 20-pin SSOP (DB) package, shared rising-edge clock and active-low output enable, 3-state drive capability (±24mA), and compatibility with 5V CMOS/TTL signal environments.
Technical Context
The SN74AHCT374DBR implements eight independent D-type flip-flops sharing a single CLK input (rising-edge sensitive) and a common OE̅ input (active-low). Its 3-state outputs support high-impedance bus isolation without external pull-ups, enabling direct connection to shared data buses. The device uses balanced CMOS output drivers capable of sourcing and sinking up to ±24mA while maintaining VOH ≥ 3.8V and VOL ≤ 0.44V at 8mA load.
It features TTL-compatible input thresholds (VIH = 2.0V min, VIL = 0.8V max at VCC = 5V), latch-up immunity exceeding 250mA per JESD17, and ESD protection rated at ±2000V HBM. All inputs must be actively driven or terminated to VCC/GND-floating inputs are prohibited due to CMOS sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 5.5V - ensures stable operation across industrial 5V supply tolerances and noise margins. |
| Propagation Delay (tPLH/tPHL) | 10.5ns max at VCC = 5V, CL = 15pF - enables reliable timing in 80MHz synchronous systems. |
| Max Clock Frequency | 80MHz at CL = 15pF - supports high-speed data capture in real-time control and communication interfaces. |
| Output Drive (IOH/IOL) | –8mA / +8mA at VOH/VOL limits - sufficient to drive multiple 74-series loads or light capacitive buses. |
| Input Compatibility | TTL-compatible (VIH = 2.0V, VIL = 0.8V) - allows direct interfacing with 5V TTL outputs without level shifters. |
| 3-State Enable Delay (tPZH/tPLZ) | 11.5ns max - ensures fast bus release for time-critical multiplexing and arbitration schemes. |
| Operating Temperature | –40°C to +85°C - qualified for commercial and industrial ambient environments. |
Pinout & Package
SN74AHCT374DBR is packaged in a 20-pin SSOP (Shrink Small Outline Package), body size 7.50mm × 5.3mm, with gull-wing leads optimized for surface-mount assembly and moderate I/O density.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE̅) | Active-low output enable | Assert low to enable Q outputs; high places all eight outputs in high-impedance state for bus sharing. |
| 2 (1Q) | Channel 1 output | 3-state output synchronized to CLK↑; mirrors 1D when OE̅ = L. |
| 3 (1D) | Channel 1 data input | Samples and latches logic level on rising CLK edge; TTL-compatible input threshold. |
| 4–9 (2D–4Q) | Channels 2–4 I/O | Paired D/Q terminals for parallel data path expansion; flow-through layout simplifies PCB routing. |
| 10 (GND) | Ground reference | Primary return path for logic and output currents; must be low-impedance for noise immunity. |
| 11 (CLK) | Clock input | Rising-edge triggered; determines sampling instant for all eight D inputs simultaneously. |
| 12–19 (5Q–8D) | Channels 5–8 I/O | Completes full octal set; identical electrical behavior to channels 1–4. |
| 20 (VCC) | Positive supply | 5V nominal power rail; requires local 0.1µF bypass capacitor adjacent to pin for switching noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type flip-flop with shared clock | Enables simultaneous latching of 8-bit parallel data on one clock edge-ideal for register files and I/O buffers. |
| 3-state outputs with balanced drive | ±24mA drive strength and matched rise/fall times allow robust bus driving without external transceivers. |
| TTL-compatible inputs | Accepts standard 5V TTL logic levels (2.0V VIH min), eliminating need for level-shifting circuitry in mixed-logic systems. |
| Flow-through pinout | Input and output pins arranged to minimize trace crossovers-reduces layer count and improves signal integrity in dense layouts. |
| Latch-up immunity & ESD robustness | Exceeds 250mA latch-up current (JESD17) and ±2000V HBM-ensures reliability in manufacturing and field operation. |
Applications
| Parallel Data Synchronization | Parallel Data Storage |
|---|---|
|
Use Scenario: Capturing asynchronous 8-bit sensor data (e.g., ADC output) into a synchronous microcontroller bus. IC Role / Device Role / Timing Role: Edge-triggered latch that samples all eight bits simultaneously on CLK↑, decoupling source timing from system clock domain. Use Value: Eliminates metastability risk across bit lines and ensures atomic read access-critical for accurate waveform capture and control loop sampling. |
Use Scenario: Holding configuration data (e.g., FPGA setup registers or display palette entries) during processor reconfiguration cycles. IC Role / Device Role / Timing Role: Static storage element retaining state while OE̅ is deasserted; retains value until next CLK↑ event. Use Value: Provides non-volatile-like retention without power loss-enables glitch-free state preservation during bus arbitration or reset sequences. |
| Shift Register Stage | Pattern Generator Output Buffer |
|
Use Scenario: Constructing a serial-to-parallel converter where cascaded SN74AHCT374DBR devices feed successive bits into parallel output lanes. IC Role / Device Role / Timing Role: Synchronous stage in multi-chip shift chain; CLK drives all stages in lockstep; OE̅ controls output visibility. Use Value: Enables deterministic bit alignment and eliminates skew between stages-essential for precise timing in test equipment and protocol analyzers. |
Use Scenario: Driving LED matrix rows or stepper motor phase signals from a pattern generator IC or FPGA. IC Role / Device Role / Timing Role: High-drive buffer isolating logic core from inductive/capacitive loads; 3-state capability allows dynamic bus sharing with other peripherals. Use Value: Delivers 8× independent, slew-controlled outputs with fast enable/disable-supports rapid pattern updates and reduces external component count. |
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 |
|---|---|---|---|
| SN74AHCT574DBR | Identical pinout, same 3-state D-flip-flop function, but includes separate output enable per group (two 4-bit sections). | Better suited for split-bus architectures requiring independent control of upper/lower nibbles. | Select when granular OE control is needed; otherwise SN74AHCT374DBR offers simpler global enable for unified 8-bit operation. |
| 74LCX374MTCX | Lower VCC range (2.0–3.6V), higher speed (tPD = 5.5ns), but not 5V-tolerant inputs-requires level translation with 5V systems. | Targeted at 3.3V-only designs; incompatible with direct 5V TTL interface. | Choose only in pure 3.3V domains; SN74AHCT374DBR remains preferred for 5V legacy compatibility and mixed-voltage interoperation. |
Compared with SN74AHCT574DBR and 74LCX374MTCX, SN74AHCT374DBR provides optimal balance of 5V system compatibility, single-global-OE simplicity, and proven industrial temperature operation-making it the default choice for cost-sensitive, interoperable 5V digital subsystems.
Availability
SN74AHCT374DBR is available at Aetrix Electronics and suitable for industrial control panels, test instrumentation, and embedded communications modules requiring stable component supply and long-term manufacturability.
Supply support for SN74AHCT374DBR 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 decades of expertise in high-reliability logic families.
SN74AHCT374DBR belongs to the AHCT advanced high-speed CMOS logic family, engineered for 5V systems requiring TTL compatibility, low power, and robust noise immunity in industrial and automotive-adjacent applications.
FAQ
What is the maximum operating frequency of the SN74AHCT374DBR?
The SN74AHCT374DBR supports a maximum clock frequency of 80MHz under recommended conditions (VCC = 5V, CL = 15pF). At 50pF load, the maximum frequency drops to 75MHz. These values are specified in the Switching Characteristics table of the official TI datasheet (SCLS241O), and reflect guaranteed performance across the full industrial temperature range (–40°C to +85°C). The SN74AHCT374DBR achieves this using optimized CMOS gate design and low-propagation-delay architecture.
Does the SN74AHCT374DBR support 3.3V logic inputs?
No, the SN74AHCT374DBR does not guarantee reliable operation with 3.3V logic inputs. Its input thresholds are TTL-compatible (VIH ≥ 2.0V, VIL ≤ 0.8V at VCC = 5V), but it is designed for 5V supply operation only. While 3.3V-high signals may often register as valid logic HIGH, TI does not characterize or guarantee functionality below VCC × 0.7 (3.5V). For true 3.3V–5V interfacing, use a level translator or select a dual-supply device such as the SN74LVC374A.
Can unused inputs on the SN74AHCT374DBR be left floating?
No, unused inputs on the SN74AHCT374DBR must never be left floating. As a CMOS device, floating inputs cause excessive current draw, oscillation, and potential device damage. All unused D inputs and OE̅ must be tied directly to VCC or GND. For OE̅, tie to VCC via a pull-up resistor (e.g., 10kΩ) to ensure high-impedance state during power-up. Input termination is mandatory per TI's "Implications of Slow or Floating CMOS Inputs" application note (SCBA004).
What is the thermal pad connection requirement for the SN74AHCT374DBR?
The SN74AHCT374DBR in DB (SSOP) package does not include a thermal pad-only the RKS (VQFN) variant has an exposed thermal pad. Therefore, no thermal pad connection is required or present for SN74AHCT374DBR. Thermal management relies on standard PCB copper pour under the package body and proper trace width for VCC/GND. The DB package has a θJA of 70°C/W, and adequate board-level copper is sufficient for typical 5V logic power dissipation (<10mW static).
Is the SN74AHCT374DBR pin-compatible with the SN74LS374N?
No, the SN74AHCT374DBR is not pin-compatible with the SN74LS374N. Although both are octal D-type flip-flops with 3-state outputs and share the same functional pin assignments (e.g., OE̅ on pin 1, CLK on pin 11), the SN74LS374N uses a 20-pin PDIP (N) package with 0.3" width, while SN74AHCT374DBR uses a 20-pin SSOP (DB) package with 0.209" width and gull-wing leads. Physical mounting, solder footprint, and reflow profile differ significantly-direct replacement requires PCB redesign.
SN74AHCT374DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 20-SSOP (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:
- 130 MHz
- Max Propagation Delay @ V, Max CL:
- 10.4ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 4 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74AHCT374DBR FAQ
1.How can I place an order for SN74AHCT374DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT374DBR 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 SN74AHCT374DBR reliable?
The price and inventory of SN74AHCT374DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT374DBR is usually 5 days.
3.What payment methods are accepted for SN74AHCT374DBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT374DBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHCT374DBR?
SN74AHCT374DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT374DBR 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 SN74AHCT374DBR?
For technical support, including SN74AHCT374DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT374DBR requirements.
6.How does Aetrix verify that SN74AHCT374DBR is sourced from the original manufacturer or authorized distributors?
All SN74AHCT374DBR 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 SN74AHCT374DBR meets industry standards.
7.What is the process for return or replacement of SN74AHCT374DBR?
All SN74AHCT374DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT374DBR, 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 SN74AHCT374DBR part is unused and in its original packaging.
Return procedure for SN74AHCT374DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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