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Texas Instruments SN74AHC374DWR
- Part No.:
- SN74AHC374DWR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHC374DWR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:873
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Product details
Overview
SN74AHC374DWR from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for bus interface applications requiring high capacitive load drive and controlled signal integrity. It operates from 2 V to 5.5 V, supports 8-bit parallel data latching on CLK rising edge, and features output-enable (OE) control for high-impedance bus isolation - used in server motherboards and network switches.
For engineers reviewing the SN74AHC374DWR datasheet, SN74AHC374DWR pinout, SN74AHC374DWR application, or SN74AHC374DWR equivalent, key selection criteria include its 3-state output drive capability, 20-pin SOIC package, ±25 mA output current rating, and compatibility with 3.3 V and 5 V logic systems.
Technical Context
The SN74AHC374DWR implements eight independent D-type flip-flops synchronized to the rising edge of CLK, each with dedicated D input and Q output. Its 3-state outputs are controlled by a shared active-low OE pin, enabling bidirectional bus driving without external pull-ups or interface components.
It uses advanced AHC CMOS technology to achieve low dynamic power consumption (typ. 32 pF Cpd), overvoltage-tolerant inputs (up to 5.5 V), and slow-edge-rate design to suppress output ringing - critical for stable operation into lightly loaded or long-trace PCB buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports mixed-voltage system interfacing and down-translation from 5 V inputs to lower VCC domains. |
| Output Drive | ±25 mA per output - sufficient to directly drive standard 50 Ω transmission lines or TTL/CMOS loads without buffers. |
| Propagation Delay | 5.4 ns (min) at 5 V - enables reliable operation up to 110 MHz fMAX with 50 pF load, suitable for high-speed I/O buffering. |
| Input Voltage Tolerance | Up to 5.5 V regardless of VCC - allows safe interfacing with legacy 5 V logic while powered from 3.3 V or 2.5 V rails. |
| ESD Rating | 2000 V HBM - meets industrial-grade robustness requirements for handling and board assembly environments. |
| Operating Temp | –40 °C to +125 °C - qualified for extended-temperature industrial and computing applications including server motherboards. |
| Power Dissipation Cap | 32 pF (typ.) - enables accurate dynamic power estimation in clocked digital systems. |
Pinout & Package
SN74AHC374DWR is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 10.3 mm (body: 12.8 mm × 7.5 mm), with gull-wing leads and RoHS-compliant NiPdAu plating. It has a Level-1 moisture sensitivity rating and is compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low output enable | Asserting low enables all eight Q outputs; high places them in high-impedance state for bus sharing. |
| 2–9, 12–19 (Q/D pairs) | Data storage & transfer terminals | Eight independent D→Q paths: pins 3/2, 4/5, 7/6, 8/9, 11/12, 13/15, 17/16, 18/19 - each latches D on CLK↑. |
| 10 (GND) | Ground reference | Primary return path for all internal logic and output currents; must be low-inductance connection. |
| 11 (CLK) | Clock input | Rising-edge-sensitive global clock synchronizing all eight flip-flops; accepts slow edges to reduce EMI. |
| 20 (VCC) | Supply voltage | Single power rail supporting 2–5.5 V operation; requires local 0.1 µF bypass capacitor per VCC pin. |
Key Features
| Feature | Design Value |
|---|---|
| Octal 3-state D flip-flops | Enables compact 8-bit register/buffer implementation with bus contention avoidance via OE control. |
| Overvoltage-tolerant inputs | Accepts 5.5 V signals at any valid VCC (2–5.5 V), simplifying level-shifting in mixed-voltage designs. |
| Slow-edge-rate outputs | Reduces overshoot/undershoot and EMI when driving unterminated or long traces - no external series resistors needed. |
| Latch-up immunity | Exceeds 250 mA per JESD17 - ensures robust operation under transient fault conditions in industrial environments. |
| Low dynamic power | 32 pF typical power dissipation capacitance - minimizes switching current and thermal load in high-frequency clock domains. |
Applications
| Server Motherboard I/O Buffering | Network Switch Data Path Register |
|---|---|
Use Scenario: Latching configuration data between CPU and peripheral controllers on high-density server backplanes. IC Role / Device Role / Timing Role: Acts as an octal registered buffer, capturing parallel status/control bits on CLK rising edge and isolating them via OE during bus arbitration. Use Value: Enables deterministic timing alignment across 8-bit data lanes while preventing bus contention during hot-swap or firmware update sequences. | Use Scenario: Holding packet header metadata in multi-port Ethernet switch ASIC interfaces. IC Role / Device Role / Timing Role: Functions as a working register staging incoming frame fields before forwarding logic, synchronized to switch fabric clock. Use Value: Provides glitch-free 8-bit storage with fast 5.4 ns propagation delay at 5 V, meeting sub-10 ns timing budgets for 100 Mbps+ switching. |
| Industrial Motor Control Interface | Test & Measurement Digital Pattern Generator |
Use Scenario: Isolating microcontroller GPIOs from noisy motor driver feedback lines in PLC modules. IC Role / Device Role / Timing Role: Serves as a buffered I/O port with 3-state outputs, decoupling MCU pins from inductive transients via OE-gated bus release. Use Value: Delivers ±25 mA drive strength and 2000 V HBM ESD protection - sustaining reliability in electrically harsh factory-floor environments. | Use Scenario: Generating precise 8-bit stimulus patterns for DUT testing in automated test equipment (ATE). IC Role / Device Role / Timing Role: Operates as a synchronous pattern latch, capturing test vectors from FPGA controller and presenting stable outputs to DUT under CLK control. Use Value: Achieves 110 MHz maximum frequency at 5 V/50 pF, supporting high-speed digital vector generation without added timing skew. |
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 |
|---|---|---|---|
| SN74AHCT374DWR | TTL-compatible inputs (VIH = 2 V min at 4.5 V); slightly higher ICC but identical pinout and timing. | Better suited for legacy 5 V TTL system integration where input threshold matching is required. | Select when interfacing with older 5 V TTL logic families; avoid if only CMOS-level signaling is present. |
| SN74LVC374APW | Lower VCC range (1.65–3.6 V), smaller TSSOP-20 package (6.5 × 6.4 mm), and faster tPLH (3.2 ns typ. at 3.3 V). | Optimized for space-constrained, low-voltage portable or battery-powered instrumentation. | Choose for 3.3 V-only systems needing reduced footprint and lower power; not interoperable with 5 V buses. |
Compared with SN74AHCT374DWR and SN74LVC374APW, the SN74AHC374DWR offers the widest supply range (2–5.5 V), highest ESD robustness (2000 V HBM), and proven suitability for industrial temperature operation - making it the preferred choice for mixed-voltage, high-reliability embedded computing.
Availability
SN74AHC374DWR is available at Aetrix Electronics and suitable for server motherboard I/O buffering, network switch data path registration, and industrial motor control interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHC374DWR 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 delivering analog and embedded processing solutions for industrial, automotive, and communications markets, with over 90 years of innovation in precision logic and interface ICs.
The SN74AHC374DWR belongs to TI's AHC logic family - engineered for high-speed, low-power, mixed-voltage bus interfacing in computing and infrastructure equipment where signal integrity and robustness are critical.
FAQ
What is the maximum clock frequency supported by SN74AHC374DWR?
The SN74AHC374DWR supports up to 110 MHz maximum operating frequency (fMAX) at VCC = 5 V with a 50 pF load, and 70 MHz at VCC = 3.3 V under the same condition. These values are specified in the Switching Characteristics tables (Sections 5.8 and 5.9) of the official datasheet SCLS240K. Performance is load- and voltage-dependent, and actual system timing must account for board trace capacitance and layout parasitics.
Does SN74AHC374DWR support 3.3 V-only operation?
Yes, SN74AHC374DWR fully supports 3.3 V operation across its entire recommended range (2 V to 5.5 V). At VCC = 3.3 V ± 0.3 V, it delivers guaranteed VOH ≥ 2.48 V and VOL ≤ 0.5 V with 4 mA load, meets setup/hold times (tsu = 4 ns, th = 2 ns), and achieves 70 MHz fMAX with 50 pF load - making it ideal for modern 3.3 V digital systems.
What is the function of the OE pin on SN74AHC374DWR?
The OE (Output Enable) pin on SN74AHC374DWR is an active-low control that places all eight Q outputs simultaneously into either normal logic states (high or low) or high-impedance mode. When OE is high, outputs are disabled and present minimal loading to the bus; when low, they actively drive based on stored D-input values. This enables clean bus sharing in multi-master systems.
Can SN74AHC374DWR inputs tolerate 5 V when powered from 3.3 V?
Yes, SN74AHC374DWR inputs are overvoltage tolerant up to 5.5 V regardless of VCC level. When powered from 3.3 V, it safely accepts 5 V logic signals without damage or level-shifting circuitry - a key feature documented in Section 7.3 (Feature Description) and confirmed in Recommended Operating Conditions (Section 5.3).
Is SN74AHC374DWR pin-compatible with other 20-pin octal flip-flops like SN74LS374?
No, SN74AHC374DWR is not pin-compatible with bipolar SN74LS374 due to differing pin assignments: LS374 places VCC on pin 20 and GND on pin 10 (same as SN74AHC374DWR), but its OE is on pin 1 and CLK on pin 11 - matching the AHC variant. However, electrical differences (CMOS vs. TTL, drive strength, timing) preclude direct substitution without validation.
SN74AHC374DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 120 MHz
- Max Propagation Delay @ V, Max CL:
- 10.1ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 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-SOIC
SN74AHC374DWR FAQ
1.How can I place an order for SN74AHC374DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC374DWR 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 SN74AHC374DWR reliable?
The price and inventory of SN74AHC374DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC374DWR is usually 5 days.
3.What payment methods are accepted for SN74AHC374DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC374DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC374DWR?
SN74AHC374DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC374DWR 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 SN74AHC374DWR?
For technical support, including SN74AHC374DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC374DWR requirements.
6.How does Aetrix verify that SN74AHC374DWR is sourced from the original manufacturer or authorized distributors?
All SN74AHC374DWR 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 SN74AHC374DWR meets industry standards.
7.What is the process for return or replacement of SN74AHC374DWR?
All SN74AHC374DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC374DWR, 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 SN74AHC374DWR part is unused and in its original packaging.
Return procedure for SN74AHC374DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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