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Texas Instruments SN74AHCT374NSR
- Part No.:
- SN74AHCT374NSR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74AHCT374NSR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,994
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Product details
Overview
SN74AHCT374NSR from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for synchronous data latching and bus interfacing in 5V digital systems. It operates from 4.5V to 5.5V VCC, delivers 10.5ns propagation delay at 5V/15pF, supports up to 80MHz operation, and features TTL-compatible inputs for seamless integration with legacy logic families - commonly used in parallel data storage and bidirectional bus buffering.
For engineers reviewing the SN74AHCT374NSR datasheet, SN74AHCT374NSR pinout, SN74AHCT374NSR application, or SN74AHCT374NSR equivalent, key selection considerations include its 20-pin TSSOP (PW) package, shared rising-edge clock and active-low output enable, balanced CMOS 3-state drive capability (±24mA), latch-up immunity (>250mA), and compatibility with 5V bus architectures requiring deterministic edge-triggered storage.
Technical Context
The SN74AHCT374NSR implements eight independent D-type flip-flops sharing a single CLK input (rising-edge sensitive) and a common OE input (active-low). Each channel captures D-input state on CLK's positive transition and holds it until the next clock edge, enabling precise parallel data synchronization across high-capacitance buses.
Its 3-state outputs support bus contention avoidance via high-impedance control, while TTL-compatible inputs accept standard 5V logic thresholds (VIH = 2.0V min, VIL = 0.8V max) without level shifting. The device maintains full functionality across –40°C to +85°C and exhibits low dynamic power dissipation (Cpd = 27pF).
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 closure in 80MHz synchronous designs. |
| Maximum 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 - provides sufficient current to drive multiple CMOS loads or light bus stubs. |
| Input Compatibility | TTL-compatible - accepts standard 5V logic levels without external biasing or translation circuitry. |
| Latch-up Immunity | >250mA per JESD17 - ensures robustness against transient current faults in noisy industrial environments. |
| Operating Temperature | –40°C to +85°C - qualified for extended temperature industrial and automotive under-hood applications. |
Pinout & Package
SN74AHCT374NSR is packaged in a 20-pin TSSOP (PW) with 0.65mm pitch, body size 6.5mm × 4.4mm, and flow-through pinout optimized for compact PCB routing and minimal signal crosstalk on parallel buses.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low output enable | Controls all eight outputs simultaneously; asserts high-impedance state when high, enabling bus sharing. |
| 2 (1Q) – 9 (4Q), 12 (5Q) – 13 (5D), 14 (6D), 15 (6Q), 16 (7Q), 17 (7D), 18 (8D), 19 (8Q) | Channel I/O pairs (D/Q) | Eight independent D-input → Q-output paths; each latches data on CLK rising edge. |
| 10 (CLK) | Rising-edge clock input | Synchronizes all flip-flop updates; requires monotonic, fast-rising transitions (≤20ns/V) for reliable triggering. |
| 11 (GND) | Ground reference | Primary return path for all signals and power; must be low-impedance to minimize ground bounce. |
| 20 (VCC) | Positive supply | 5V nominal supply; requires local 0.1µF bypass capacitor adjacent to pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Enables straight-line PCB trace routing between D and Q pins, reducing stub length and signal integrity degradation on parallel buses. |
| Balanced CMOS 3-state outputs | Provides symmetrical sourcing/sinking capability (±8mA), allowing direct connection to bidirectional data buses without external pull-ups. |
| TTL-compatible inputs | Accepts standard 5V TTL voltage thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V), eliminating need for level-shifting circuitry in mixed-logic systems. |
| Low propagation delay | 10.5ns max ensures tight timing margins in high-frequency register files and pipeline stages. |
| Latch-up immunity | Exceeds 250mA per JESD17 - critical for reliability in electrically harsh environments like motor drives and power supplies. |
Applications
| Parallel Data Synchronization | Parallel Data Storage |
|---|---|
|
Use Scenario: Capturing real-time sensor data from an 8-bit ADC interface before transferring to a microcontroller. IC Role / Device Role / Timing Role: Edge-triggered latch holding sampled values stable during CPU read cycles; CLK synchronized to ADC conversion complete signal. Use Value: Eliminates metastability risk by providing deterministic setup/hold timing (tsu/th = 2.5ns) and isolating ADC output from bus loading during reads. |
Use Scenario: Holding configuration bits for an FPGA or CPLD during power-up initialization sequence. IC Role / Device Role / Timing Role: Non-volatile register bank storing boot parameters; OE held inactive until configuration firmware asserts valid data. Use Value: Enables glitch-free parameter retention using 3-state isolation, preventing spurious writes during system reset or brown-out conditions. |
| Shift Register Building Block | Pattern Generator Interface |
|
Use Scenario: Constructing a 24-bit serial-to-parallel shift register by cascading three SN74AHCT374NSR devices. IC Role / Device Role / Timing Role: Synchronous stage element accepting serial data via daisy-chained Q→D connections; CLK driven by master bit clock. Use Value: Delivers consistent 10.5ns inter-stage delay and rail-to-rail 5V logic swing, ensuring clean waveform edges across all 24 bits. |
Use Scenario: Driving test patterns onto a memory bus during automated functional testing of DRAM modules. IC Role / Device Role / Timing Role: Bus driver generating repeatable address/data sequences; OE toggled to insert idle cycles between pattern bursts. Use Value: High-impedance disable allows safe bus release between test vectors, preventing contention with memory controller during reconfiguration. |
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 |
|---|---|---|---|
| SN74AHCT574PW | Same 20-pin TSSOP package and 5V operation, but features transparent latch (not edge-triggered); no OE pin - outputs always enabled. | Used where continuous data pass-through is required instead of clock-synchronized capture. | Select SN74AHCT574PW only if latch behavior suffices and bus contention management via OE is unnecessary. |
| 74LVC374APW | 3.3V-only operation (1.65–3.6V), lower propagation delay (6.1ns), higher drive (±24mA), but not TTL-compatible - requires level-shifting for 5V systems. | Targeted at modern low-voltage embedded controllers and FPGAs, not legacy 5V backplanes. | Choose 74LVC374APW only in new 3.3V designs; avoid in mixed-voltage or 5V-only systems due to input incompatibility. |
Compared with SN74AHCT374NSR, SN74AHCT574PW lacks edge-triggered control and bus isolation, while 74LVC374APW trades 5V compatibility for speed and efficiency - making SN74AHCT374NSR the optimal choice for industrial 5V bus synchronization where timing determinism and legacy interoperability are essential.
Availability
SN74AHCT374NSR is available at Aetrix Electronics and suitable for industrial control panels, automotive body electronics, and test equipment requiring stable component supply, long-term lifecycle support, and guaranteed 5V logic compatibility.
Supply support for SN74AHCT374NSR 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 high-reliability digital components.
The SN74AHCT374NSR belongs to TI's AHCT logic family, engineered for robust 5V operation in industrial and automotive environments where noise immunity, latch-up resistance, and TTL interoperability are critical design requirements.
FAQ
What is the maximum operating frequency of the SN74AHCT374NSR?
The SN74AHCT374NSR supports up to 80MHz operation under recommended conditions (VCC = 5V, CL = 15pF). This is verified by timing characterization in the official datasheet (SCLS241O), where fmax is measured with 50% duty-cycle clock input and one output loaded at a time. Performance degrades with higher capacitive loads - e.g., at CL = 50pF, maximum frequency drops to 75MHz.
Does the SN74AHCT374NSR require external pull-up resistors on unused inputs?
Yes - all unused inputs of the SN74AHCT374NSR must be terminated to either VCC or GND to prevent floating states that cause excessive power consumption or oscillation. TI explicitly recommends a 10kΩ pull-up or pull-down resistor for unconnected inputs, as stated in Section 5.3 and 7.3.2 of the datasheet. Leaving inputs unconnected violates recommended operating conditions and risks functional instability.
Can the SN74AHCT374NSR drive a 50pF load reliably?
Yes - the SN74AHCT374NSR is fully characterized and specified for operation with up to 50pF total load capacitance. All switching characteristics (tPLH, tPHL, fmax) in the datasheet are provided for both CL = 15pF and CL = 50pF conditions. At 50pF, propagation delay increases to 11.5ns and maximum frequency reduces to 75MHz, but timing remains guaranteed across the full operating temperature range.
Is the SN74AHCT374NSR pin-compatible with other 20-pin octal flip-flops?
No - the SN74AHCT374NSR has a unique pinout defined for its TSSOP (PW) package, including dedicated OE on Pin 1 and CLK on Pin 10. While other octal D-flip-flops like SN74AHCT574PW share the same 20-pin TSSOP footprint, their pin functions differ significantly (e.g., SN74AHCT574PW uses Pin 11 for CLK and has no OE). Direct replacement requires board-level redesign.
What thermal considerations apply to the SN74AHCT374NSR in continuous operation?
The SN74AHCT374NSR in TSSOP (PW) package has a junction-to-ambient thermal resistance (RθJA) of 116.8°C/W. Under worst-case conditions (VCC = 5.5V, all outputs switching at 80MHz into 50pF), total power dissipation remains below 50mW - resulting in negligible junction temperature rise (<6°C above ambient) without heatsinking. TI confirms no thermal derating is needed for standard industrial use.
SN74AHCT374NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 20-SOIC (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:
- 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-SO
SN74AHCT374NSR FAQ
1.How can I place an order for SN74AHCT374NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT374NSR 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 SN74AHCT374NSR reliable?
The price and inventory of SN74AHCT374NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT374NSR is usually 5 days.
3.What payment methods are accepted for SN74AHCT374NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT374NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHCT374NSR?
SN74AHCT374NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT374NSR 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 SN74AHCT374NSR?
For technical support, including SN74AHCT374NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT374NSR requirements.
6.How does Aetrix verify that SN74AHCT374NSR is sourced from the original manufacturer or authorized distributors?
All SN74AHCT374NSR 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 SN74AHCT374NSR meets industry standards.
7.What is the process for return or replacement of SN74AHCT374NSR?
All SN74AHCT374NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT374NSR, 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 SN74AHCT374NSR part is unused and in its original packaging.
Return procedure for SN74AHCT374NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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