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Texas Instruments SN74AC374DBR
- Part No.:
- SN74AC374DBR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74AC374DBR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,196
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Product details
Overview
SN74AC374DBR from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state noninverting outputs, designed for bus interface and data latching in digital systems operating from 2V to 6V. It features 9.5ns max propagation delay at 5V, ±24mA output drive capability, and operates across −40°C to +85°C. It is used in bidirectional bus drivers and I/O port buffering where high-impedance isolation and parallel data capture are required.
For engineers reviewing the SN74AC374DBR datasheet, SN74AC374DBR pinout, SN74AC374DBR application, or SN74AC374DBR equivalent, key selection criteria include VCC range compatibility (2–6V), 3-state output enable timing, clock-to-Q propagation delay (≤9.5ns at 5V), and SSOP-20 package footprint constraints for high-density PCB layouts.
Technical Context
This device implements eight independent D-type flip-flops, each triggered on the positive edge of CLK. The buffered OE input controls all eight outputs simultaneously, placing them in high-impedance state without affecting internal latch operation - enabling data retention during bus contention or power sequencing.
It supports mixed-voltage interfacing: inputs tolerate up to 6V regardless of VCC, and outputs drive capacitive bus loads directly. Timing parameters are specified at both 3.3V and 5V supply levels, with setup time as low as 4ns and hold time as low as 1.5ns at 5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - enables direct interface with 3.3V and 5V logic families without level shifters |
| Max tPD (5V) | 9.5ns - ensures sub-10ns data capture latency for high-speed synchronous buses |
| Output Drive | ±24mA at 5V - sufficient to drive standard 50pF bus loads with clean edges |
| Input Voltage Tolerance | Up to 6V - allows safe connection to higher-voltage control signals even at lower VCC |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded and computing applications |
| 3-State Enable Delay | tPZH/tPLZ ≤ 8.5ns at 5V - fast output disable/enable critical for dynamic bus arbitration |
Pinout & Package
SN74AC374DBR uses a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm pitch, body size 7.2mm × 5.30mm, and overall package size 7.2mm × 7.8mm. It is RoHS-compliant, moisture sensitivity level 1, and rated for reflow up to 260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable | Active-low control for all eight 3-state outputs; does not affect internal latch state |
| 2–9, 12, 15–19 (1Q–8Q) | Outputs | Noninverting latched data outputs; high-impedance when OE = high |
| 3–4, 7–8, 13–14, 17–18 (1D–8D) | Data Inputs | Independent D inputs synchronized to rising CLK edge; tolerate up to 6V |
| 10 (GND) | Ground | Reference return path for all signals and power; must be low-impedance |
| 11 (CLK) | Clock Input | Positive-edge-triggered master clock; accepts fast transitions (≤8 ns/V slew rate) |
| 20 (VCC) | Power Supply | Single supply rail supporting 2–6V operation; requires local 0.1µF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range | 2V–6V operation eliminates need for separate voltage rails in mixed-supply systems |
| 3-state bus interface | Simultaneous high-impedance control of all outputs enables clean bus sharing without external transceivers |
| Input overvoltage tolerance | Inputs accept up to 6V regardless of VCC - simplifies interconnection with legacy or higher-voltage peripherals |
| Low propagation delay | 9.5ns max tPD at 5V supports >100MHz clock domains in synchronous data paths |
| Industrial temperature grade | −40°C to +85°C operation ensures reliability in factory automation, test equipment, and networking hardware |
Applications
| Buffer Register | I/O Port Interface |
|---|---|
Use Scenario: Isolating microcontroller GPIO banks from noisy peripheral buses while maintaining data integrity during read/write cycles. IC Role / Device Role / Timing Role: Acts as an octal transparent latch with 3-state outputs, capturing parallel data on CLK rise and enabling/disabling bus access via OE. Use Value: Eliminates need for discrete pull-up resistors or bus buffers; reduces BOM count and layout area in compact MCU-based designs. |
Use Scenario: Implementing configurable bidirectional data ports between FPGA and external memory or sensor arrays. IC Role / Device Role / Timing Role: Provides direction-controlled latching: data written from controller to peripheral when OE active, and read back when OE inactive. Use Value: Enables deterministic timing control over bus direction switching with sub-10ns output enable/disable delays. |
| Bidirectional Bus Driver | Working Register |
Use Scenario: Driving shared address/data buses in legacy industrial controllers where multiple masters require controlled access. IC Role / Device Role / Timing Role: Functions as a high-drive, low-latency bus transceiver with OE-synchronized output gating - no internal direction pin required. Use Value: Delivers ±24mA drive at 5V, supporting longer trace lengths and higher fanout than standard logic buffers. |
Use Scenario: Storing intermediate computation results in real-time signal processing pipelines where pipeline stage synchronization is critical. IC Role / Device Role / Timing Role: Serves as a clocked storage element with simultaneous parallel load capability - all eight bits updated on one CLK edge. Use Value: Ensures atomic register updates with guaranteed setup/hold margins (4ns/1.5ns at 5V), preventing metastability in pipelined architectures. |
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 |
|---|---|---|---|
| SN74LVC374APWR | Lower VCC range (1.65–3.6V); 3.3V-only optimized; 6.7ns tPD at 3.3V | Suitable only for 3.3V systems; lacks 5V tolerance and 6V input rating | Select when operating exclusively at 3.3V and lowest possible propagation delay is prioritized |
| 74AC574SCX | Same AC logic family; PDIP-20 package; identical timing but larger footprint and no RoHS compliance | Preferred for through-hole prototyping or legacy repair; incompatible with fine-pitch SSOP layouts | Choose for hand-soldered development boards or field replacement where SSOP rework is impractical |
Compared with SN74LVC374APWR and 74AC574SCX, SN74AC374DBR uniquely balances wide supply flexibility (2–6V), 6V-tolerant inputs, and SSOP-20 compactness - making it optimal for mixed-voltage industrial control modules requiring long-term component availability and thermal robustness.
Availability
SN74AC374DBR is available at Aetrix Electronics and suitable for industrial control systems, test instrumentation, and embedded computing platforms requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for SN74AC374DBR 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 50 years of innovation in high-reliability digital interfaces.
SN74AC374DBR belongs to the 74AC logic family - engineered for high-speed, low-power, mixed-voltage interoperability in industrial and computing infrastructure applications.
FAQ
What is the maximum clock frequency supported by SN74AC374DBR?
SN74AC374DBR supports a maximum clock frequency of 100 MHz at VCC = 5 V ± 0.5 V and 60 MHz at VCC = 3.3 V ± 0.3 V, as specified in the switching characteristics tables. These values reflect guaranteed timing performance under recommended operating conditions and are validated across the full industrial temperature range (−40°C to +85°C) for SN74AC374DBR.
Does SN74AC374DBR require external pull-up resistors on the OE pin?
Yes - for defined high-impedance state during power-up or power-down, OE must be tied to VCC through a pullup resistor. TI specifies that the minimum resistor value depends on the current-sinking capability of the driver; typical values range from 4.7kΩ to 10kΩ. This ensures reliable output disable before internal circuitry stabilizes in SN74AC374DBR.
Can SN74AC374DBR interface safely with 5V logic while powered at 3.3V?
Yes - SN74AC374DBR inputs tolerate voltages up to 6V regardless of VCC level, so 5V signals applied to D or CLK pins are safe at VCC = 3.3V. Outputs swing rail-to-rail (0V to 3.3V), requiring level translation if driving legacy 5V inputs. This input overvoltage capability is a verified feature of SN74AC374DBR.
What is the thermal resistance (RθJA) of SN74AC374DBR in its SSOP package?
The junction-to-ambient thermal resistance RθJA for SN74AC374DBR in the DB (SSOP-20) package is 70°C/W, as documented in Section 4.3 of the official datasheet. This value assumes standard JEDEC high-k board conditions and is critical for thermal design validation in enclosed industrial enclosures where SN74AC374DBR may operate continuously at full load.
Is SN74AC374DBR pin-compatible with other 74AC374 variants in different packages?
Yes - all 74AC374 variants (e.g., SN74AC374DWR, SN74AC374N) share identical pin functions and numbering across SOIC, PDIP, SSOP, and TSSOP packages. The pinout is standardized per Figure 3-1 in the datasheet, confirming mechanical and electrical compatibility at the signal level for SN74AC374DBR and its counterparts.
SN74AC374DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- 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:
- 155 MHz
- Max Propagation Delay @ V, Max CL:
- 9.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 4.5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74AC374DBR FAQ
1.How can I place an order for SN74AC374DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC374DBR 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 SN74AC374DBR reliable?
The price and inventory of SN74AC374DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC374DBR is usually 5 days.
3.What payment methods are accepted for SN74AC374DBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC374DBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AC374DBR?
SN74AC374DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC374DBR 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 SN74AC374DBR?
For technical support, including SN74AC374DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC374DBR requirements.
6.How does Aetrix verify that SN74AC374DBR is sourced from the original manufacturer or authorized distributors?
All SN74AC374DBR 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 SN74AC374DBR meets industry standards.
7.What is the process for return or replacement of SN74AC374DBR?
All SN74AC374DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC374DBR, 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 SN74AC374DBR part is unused and in its original packaging.
Return procedure for SN74AC374DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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