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Texas Instruments SN74BCT374DW
- Part No.:
- SN74BCT374DW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74BCT374DW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,577
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Product details
Overview
SN74BCT374DW from Texas Instruments is an octal edge-triggered D-type latch with 3-state outputs, designed for bus interfacing and register storage in TTL-compatible systems. It operates at 4.5 V–5.5 V, supports 70 MHz clock frequency, features rising-edge clock triggering, and delivers ±64 mA output drive capability per channel in active state.
For engineers reviewing the SN74BCT374DW datasheet, SN74BCT374DW pinout, SN74BCT374DW application, or SN74BCT374DW equivalent, key selection criteria include its BiCMOS architecture for reduced ICCZ versus standard TTL, shared CLK/OE control logic, 20-pin SOIC package thermal profile (RθJA = 73.4°C/W), and compatibility with 50 pF capacitive loads while meeting timing specs.
Technical Context
This device implements eight independent D-type flip-flops sharing a single rising-edge-triggered clock (CLK) and a common active-low output-enable (OE) input. Each channel latches data on CLK's positive transition and holds it until the next clock edge, with OE independently placing all Q outputs into high-impedance state without affecting internal latch states.
The BiCMOS design combines bipolar output drivers for high-current drive (±64 mA) and CMOS inputs for low leakage (IIL ≤ –0.6 mA, IIH ≤ 20 μA), enabling direct connection to TTL and CMOS buses while maintaining fast propagation delays (tPLH/tPHL ≤ 10.6 ns at 0°C–70°C) and tight setup/hold timing (tsu = 6.5 ns, th = 0 ns).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL systems and stable operation across industrial temperature range (0°C to 70°C) |
| Max Clock Frequency | 70 MHz - enables high-speed data capture in bus buffering and I/O port applications without violating timing margins |
| Output Drive | ±64 mA per channel - sufficient to directly drive terminated 50 Ω transmission lines or multiple TTL inputs without external buffers |
| Propagation Delay | tPLH/tPHL ≤ 10.6 ns - guarantees sub-11 ns signal path delay under worst-case conditions, critical for synchronous bus timing |
| Input Leakage | IIL ≤ –0.6 mA, IIH ≤ 20 μA - minimizes static power draw and prevents floating-input oscillation when unused pins are tied to VCC/GND |
| Capacitive Load Limit | ≤ 50 pF - defines maximum trace + receiver capacitance allowable while maintaining full-spec switching performance |
| Thermal Resistance | RθJA = 73.4°C/W (SOIC-20) - determines junction temperature rise under typical PCB layout; requires no heatsink below 100 mW dissipation |
Pinout & Package
SN74BCT374DW is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package measuring 12.80 mm × 7.50 mm, optimized for surface-mount assembly and moderate-power thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low output enable | Asserting low places all eight Q outputs in high-impedance state; does not affect internal latch data retention |
| 2–9, 12, 15–19 (1Q–8Q) | Output terminals | Eight buffered, 3-state outputs capable of sourcing/sinking up to 64 mA each; electrically isolated when OE is high |
| 3–4, 7–8, 13–14, 17–18 (1D–8D) | Data inputs | Eight asynchronous D inputs sampled only on CLK rising edge; CMOS-compatible with 0.8 V/2.0 V logic thresholds |
| 11 (CLK) | Clock input | Rising-edge-triggered control signal; synchronizes latching of all eight D inputs to respective Q outputs simultaneously |
| 10 (GND) | Ground reference | Primary return path for all output sink current and internal logic; must be low-impedance to maintain VOL ≤ 0.55 V |
| 20 (VCC) | Power supply | 5 V nominal supply rail; powers both bipolar output stage and CMOS input circuitry; requires local 0.1 μF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS architecture | Reduces quiescent supply current (ICCZ ≤ 8 mA) by >50% vs. legacy TTL equivalents, lowering system-level power and heat generation |
| Shared control logic | Single CLK and OE pin manage all eight channels, simplifying PCB routing and reducing FPGA/CPLD pin count in register-file designs |
| 3-state bus driving | Enables direct connection to shared data/address buses without external pull-ups or isolation logic, supporting multi-master arbitration |
| Buffered control inputs | OE and CLK inputs include internal Schmitt-trigger-like buffering, improving noise immunity and eliminating need for external RC filtering |
| High-current bipolar outputs | Deliver 64 mA sink/source per output-sufficient to drive 10+ TTL loads or terminate 50 Ω lines-without external driver stages |
Applications
| Buffer Registers | I/O Ports |
|---|---|
|
Use Scenario: Holding parallel data between CPU and peripheral devices during handshake cycles. IC Role / Device Role / Timing Role: Latches 8-bit data on rising CLK edge; OE controls bus release during idle periods. Use Value: Eliminates need for discrete buffers or multiplexers, reducing BOM count and board area in microcontroller-based peripherals. |
Use Scenario: Isolating bidirectional data paths between processor and external memory or sensors. IC Role / Device Role / Timing Role: Provides direction-controlled 8-bit data path via OE; CLK synchronizes read/write transfers. Use Value: Enables clean separation of read and write phases on shared bus lines, preventing contention and signal corruption. |
| Bus Drivers | Working Registers |
|
Use Scenario: Driving high-capacitance backplane traces or long ribbon cables in industrial control systems. IC Role / Device Role / Timing Role: Acts as active bus transceiver with 64 mA drive strength and 50 pF load tolerance. Use Value: Maintains signal integrity over 15 cm FR-4 traces at 70 MHz, avoiding timing skew or overshoot seen with weaker drivers. |
Use Scenario: Storing intermediate computation results in programmable logic controllers or test equipment. IC Role / Device Role / Timing Role: Holds eight bits of status or configuration data; retains value across OE assertion cycles. Use Value: Allows non-volatile state retention without continuous clocking-critical for deterministic real-time response in safety-critical firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT374DW | CMOS-only process; lower ICCZ (≤ 4 μA), higher VIH/VIL thresholds (2 V/0.8 V), but reduced output drive (±24 mA) | Better suited for low-power mixed-signal systems; insufficient for driving heavy TTL loads or 50 Ω lines | Select when power efficiency and noise margin outweigh drive strength requirements |
| SN74LS374N | TTL process; higher ICCZ (≤ 50 mA), slower max clock (30 MHz), larger PDIP-20 package (25.4 mm × 6.35 mm) | Legacy drop-in replacement where footprint and thermal constraints allow; incompatible with high-speed timing budgets | Choose only for backward-compatible repairs or cost-sensitive non-performance applications |
Compared with SN74ACT374DW and SN74LS374N, SN74BCT374DW uniquely balances TTL-compatible drive strength, BiCMOS power efficiency, and SOIC thermal performance-making it optimal for new industrial bus interface designs requiring both speed and robustness.
Availability
SN74BCT374DW is available at Aetrix Electronics and suitable for buffer registers, I/O ports, and bus drivers requiring stable component supply, long-term industrial lifecycle support, and consistent SOIC-20 packaging across production batches.
Supply support for SN74BCT374DW 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 experience in high-reliability industrial and automotive-grade components.
The SN74BCT374DW belongs to TI's BCT (Bipolar-CMOS-Transistor) logic family, engineered specifically for high-drive, low-power bus interfacing in industrial control, instrumentation, and legacy-system upgrades.
FAQ
What is the maximum clock frequency supported by SN74BCT374DW?
The SN74BCT374DW supports a maximum clock frequency of 70 MHz under recommended operating conditions (VCC = 4.5 V–5.5 V, TA = 0°C–70°C). This rating is validated by timing parameters including tPLH/tPHL ≤ 10.6 ns and tsu = 6.5 ns, ensuring reliable data capture in high-speed bus applications without setup/hold violations. The SN74BCT374DW maintains this spec across its full voltage and temperature range.
Does SN74BCT374DW require external pull-up resistors on its outputs?
No, SN74BCT374DW does not require external pull-up resistors on its outputs because its 3-state outputs are actively driven high or low when enabled, and enter true high-impedance (not floating) when OE is high. Pull-ups would interfere with the specified VOH/VOL levels and increase power consumption. Unused outputs may be left floating per TI's guidance, but must never be tied directly to VCC or GND.
Can SN74BCT374DW operate with a 3.3 V supply?
No, SN74BCT374DW is not rated for 3.3 V operation. Its recommended operating voltage range is strictly 4.5 V to 5.5 V, and absolute maximum ratings limit VCC to 7 V. Applying 3.3 V will result in undefined logic thresholds, degraded noise margins, and failure to meet VOH ≥ 2.4 V or VOL ≤ 0.55 V specifications. For 3.3 V systems, consider SN74LVC374A or similar LVCMOS alternatives.
How should unused inputs be handled on SN74BCT374DW?
All unused inputs on SN74BCT374DW-including D inputs, CLK, and OE-must be terminated to either VCC or GND to prevent floating states that cause excessive power draw, oscillation, or latch-up. TI specifies that CMOS inputs like those on SN74BCT374DW exhibit high impedance and require firm biasing; a 10 kΩ pull-up or pull-down resistor is recommended if dynamic control is needed, but direct connection is acceptable for permanently fixed logic levels.
What is the thermal resistance (RθJA) of SN74BCT374DW in its SOIC package?
The junction-to-ambient thermal resistance (RθJA) of SN74BCT374DW in the SOIC-20 package is 73.4°C/W, as specified in TI's official datasheet (SCBS019D, Section 6.4). This value assumes standard JEDEC 2-layer board conditions and confirms the device can dissipate up to ~100 mW without exceeding safe junction temperatures in typical industrial layouts-eliminating need for heatsinks in most applications.
SN74BCT374DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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:
- 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:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74BCT374DW FAQ
1.How can I place an order for SN74BCT374DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT374DW 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 SN74BCT374DW reliable?
The price and inventory of SN74BCT374DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT374DW is usually 5 days.
3.What payment methods are accepted for SN74BCT374DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT374DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74BCT374DW?
SN74BCT374DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT374DW 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 SN74BCT374DW?
For technical support, including SN74BCT374DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT374DW requirements.
6.How does Aetrix verify that SN74BCT374DW is sourced from the original manufacturer or authorized distributors?
All SN74BCT374DW 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 SN74BCT374DW meets industry standards.
7.What is the process for return or replacement of SN74BCT374DW?
All SN74BCT374DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT374DW, 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 SN74BCT374DW part is unused and in its original packaging.
Return procedure for SN74BCT374DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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