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Texas Instruments SN74BCT374NG4
- Part No.:
- SN74BCT374NG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74BCT374NG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,057
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Product details
Overview
SN74BCT374NG4 from Texas Instruments is an octal edge-triggered D-type latch with 3-state outputs, designed for bus interface and register buffering in TTL-compatible systems. It operates at 4.5 V–5.5 V, features rising-edge clock triggering, shared output-enable (OE) control, and delivers ±64 mA output drive per channel at 5 V. It is used in industrial I/O port expansion and memory address latching.
For engineers reviewing the SN74BCT374NG4 datasheet, SN74BCT374NG4 pinout, SN74BCT374NG4 application, or SN74BCT374NG4 equivalent, key selection criteria include its BiCMOS architecture for reduced ICCZ versus standard TTL, 70 MHz maximum clock frequency, 3-state output timing (tPZH/tPLZ ≤ 6.8 ns), and PDIP-20 package compatibility with legacy board layouts.
Technical Context
The SN74BCT374NG4 implements eight independent D-type flip-flops sharing a single rising-edge-triggered CLK and active-low OE input. Its BiCMOS design combines bipolar output drivers for high-current drive (±64 mA) with CMOS inputs for low static power and high noise immunity.
Each channel latches data on CLK's positive transition; OE independently places all Q outputs into high-impedance state without affecting internal storage. The device supports hot-swap-capable bus driving via fast enable/disable times (tPZH ≤ 6.8 ns, tPLZ ≤ 6.8 ns) and maintains data integrity across –40°C to 85°C ambient operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with 5 V TTL and mixed-voltage logic systems |
| Max Clock Frequency | 70 MHz - enables high-speed data latching in real-time control and instrumentation interfaces |
| Output Drive | ±64 mA per channel at VCC = 4.5 V - sufficient to directly drive 50 pF bus loads without external buffers |
| Propagation Delay | tPLH/tPHL ≤ 10.6 ns - guarantees sub-11 ns signal path timing for synchronous bus arbitration |
| Enable Timing | tPZH/tPLZ ≤ 6.8 ns - allows rapid bus release/activation critical for time-multiplexed peripheral access |
| Input Leakage | ±0.6 mA max at VI = 0.5 V or 2.7 V - minimizes unintended current paths in high-density PCB routing |
| Operating Temperature | 0°C to 70°C - validated for commercial-grade embedded systems and industrial control panels |
Pinout & Package
SN74BCT374NG4 is supplied in a 20-pin plastic dual in-line package (PDIP) with 25.40 mm × 6.35 mm body size and 2.54 mm lead pitch. The package supports through-hole mounting and legacy socket compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low output enable | Controls all eight Q outputs simultaneously; low = normal logic state, high = high-impedance bus isolation |
| 2–9, 12–19 (1Q–8Q, 1D–8D) | Data input/output pairs | Eight independent D/Q channels; each D latches to corresponding Q on CLK rising edge |
| 10 (GND) | Ground reference | Primary return path for all output sink currents and internal logic; requires low-impedance PCB plane |
| 11 (CLK) | Clock input | Rising-edge sensitive; synchronizes all eight latches; must meet 6.5 ns minimum setup/0 ns hold time |
| 20 (VCC) | Positive supply | Supplies both logic core and bipolar output drivers; requires local 0.1 µF ceramic decoupling |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS output architecture | Reduces ICCZ quiescent current versus pure TTL while retaining bipolar drive strength and noise margin |
| Buffered control inputs | OE and CLK inputs include internal Schmitt-trigger-like buffering to reject noise and ensure clean edge detection |
| 3-state bus-driving capability | Enables direct connection to shared data/address buses without external transceivers or pull-up resistors |
| Full parallel data loading | All eight D inputs sampled simultaneously on one CLK edge-ideal for register file write operations |
| High-impedance retention mode | OE can be asserted during CLK transitions without disturbing stored data-supports dynamic bus arbitration |
Applications
| Industrial I/O Port Expansion | Memory Address Latching |
|---|---|
Use Scenario: Expanding microcontroller GPIO count to drive discrete sensors, relays, and status LEDs in PLC backplanes. IC Role / Device Role / Timing Role: Acts as an output register, holding stable logic states between MCU write cycles while isolating downstream loads from bus switching noise. Use Value: Eliminates need for discrete buffer ICs by delivering ±64 mA per channel and supporting hot-plug-safe 3-state control. | Use Scenario: Capturing and holding upper address bits from a microprocessor during multiplexed address/data bus cycles. IC Role / Device Role / Timing Role: Functions as an address latch, freezing A8–A15 during AD0–AD7 data transfer phases in 8086/8088-style systems. Use Value: Meets strict 6.5 ns setup/0 ns hold timing relative to CLK, ensuring reliable address capture without additional timing margin circuitry. |
| Legacy Bus Interface Buffering | Test Equipment Signal Conditioning |
Use Scenario: Isolating and strengthening signals between mismatched logic families (e.g., 5 V TTL CPU and 3.3 V FPGA peripherals). IC Role / Device Role / Timing Role: Serves as a level-shifting bus driver with 3-state control, enabling bidirectional data flow on shared traces. Use Value: Provides 70 MHz bandwidth and <11 ns propagation delay-preserves signal integrity across 20 cm PCB traces loaded to 50 pF. | Use Scenario: Capturing and holding analog-to-digital converter output words in automated test equipment before serial upload to host PC. IC Role / Device Role / Timing Role: Operates as a working register, storing 8-bit ADC results until host controller initiates readback via OE-controlled bus release. Use Value: Retains data during OE assertion, allowing asynchronous host polling without loss of conversion samples. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT374N | CMOS-based; lower ICC (2 µA typical), 4.5–5.5 V supply, but only ±24 mA output drive | Better for low-power, low-noise digital systems; insufficient for heavy bus loading | Select when power efficiency and EMI reduction outweigh drive strength requirements |
| SN74LS374N | TTL-based; 4.75–5.25 V supply, ±24 mA drive, higher ICCZ, slower tPLH (15 ns typ) | Suitable for legacy TTL-only designs where BiCMOS advantages are not needed | Choose only for drop-in replacement in existing LS-based boards with no timing or thermal constraints |
Compared with SN74ACT374N and SN74LS374N, the SN74BCT374NG4 uniquely balances TTL-compatible drive strength (±64 mA), BiCMOS power efficiency (ICCZ ≤ 8 mA), and 70 MHz speed-making it optimal for industrial bus interfaces requiring robust signal integrity and thermal stability.
Availability
SN74BCT374NG4 is available at Aetrix Electronics and suitable for industrial I/O port expansion, memory address latching, and legacy bus interface buffering requiring stable component supply and long-term obsolescence management.
Supply support for SN74BCT374NG4 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 SN74BCT374NG4 belongs to TI's BCT logic family, engineered to bridge TTL performance and CMOS efficiency-specifically targeting high-drive, noise-immune bus interfacing in commercial-temperature industrial control systems.
FAQ
What is the maximum clock frequency supported by SN74BCT374NG4?
The SN74BCT374NG4 supports a maximum clock frequency of 70 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C). This rating is verified across all eight channels and accounts for worst-case propagation delays (tPLH/tPHL ≤ 10.6 ns) and setup/hold timing margins. Exceeding 70 MHz may result in metastability or data capture failure.
Does SN74BCT374NG4 require external pull-up resistors on its 3-state outputs?
No, SN74BCT374NG4 does not require external pull-up resistors on its 3-state outputs. Its bipolar push-pull outputs actively drive high or low states and enter true high-impedance (Z) when OE is high-eliminating bus contention and enabling direct connection to shared lines. Pull-ups are unnecessary and may degrade switching performance or increase power consumption.
Can SN74BCT374NG4 operate with a 3.3 V supply voltage?
No, SN74BCT374NG4 cannot operate reliably with a 3.3 V supply. Its absolute minimum supply voltage is 4.5 V, and recommended operating range is strictly 4.5 V to 5.5 V. Applying 3.3 V will result in undefined logic states, insufficient output drive, and potential failure to meet timing specifications-including setup/hold and propagation delay limits.
How should unused inputs be handled on SN74BCT374NG4?
All unused inputs on SN74BCT374NG4-including D inputs, CLK, and OE-must be terminated to either VCC or GND. Floating CMOS inputs cause excessive current draw, oscillation, and increased power dissipation. Direct connection is acceptable for permanently unused pins; for intermittently used signals, a 10-kΩ pull-up or pull-down resistor is recommended to ensure valid logic levels during inactive periods.
Is SN74BCT374NG4 RoHS compliant and lead-free?
Yes, SN74BCT374NG4 is RoHS compliant and lead-free. It meets JEDEC J-STD-609 Category 2a marking requirements and is manufactured using TI's green packaging process. The "G4" suffix explicitly denotes lead-free, RoHS-compliant packaging with matte tin lead finish-suitable for modern reflow soldering profiles and environmentally regulated production environments.
SN74BCT374NG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- 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:
- 9.1ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 5 mA
- Input Capacitance:
- 6 pF
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74BCT374NG4 FAQ
1.How can I place an order for SN74BCT374NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT374NG4 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 SN74BCT374NG4 reliable?
The price and inventory of SN74BCT374NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT374NG4 is usually 5 days.
3.What payment methods are accepted for SN74BCT374NG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT374NG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74BCT374NG4?
SN74BCT374NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT374NG4 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 SN74BCT374NG4?
For technical support, including SN74BCT374NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT374NG4 requirements.
6.How does Aetrix verify that SN74BCT374NG4 is sourced from the original manufacturer or authorized distributors?
All SN74BCT374NG4 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 SN74BCT374NG4 meets industry standards.
7.What is the process for return or replacement of SN74BCT374NG4?
All SN74BCT374NG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT374NG4, 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 SN74BCT374NG4 part is unused and in its original packaging.
Return procedure for SN74BCT374NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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