My Inquiry
My Account
Texas Instruments SN74HCT374DWG4
- Part No.:
- SN74HCT374DWG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HCT374DWG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,759
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74HCT374DWG4 from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, operating at 4.5 V–5.5 V supply voltage, featuring 22 ns typical propagation delay, ±6 mA output drive at 5 V, and TTL-compatible inputs. It serves as a bus-oriented register in digital systems requiring synchronized data latching and bidirectional bus isolation.
For engineers reviewing the SN74HCT374DWG4 datasheet, SN74HCT374DWG4 pinout, SN74HCT374DWG4 application, or SN74HCT374DWG4 equivalent, this page delivers verified functional behavior, SOIC-20 package mapping, timing constraints for clock/data setup/hold, 3-state enable control logic, and validated alternatives for industrial I/O buffering and bus interface design.
Technical Context
The SN74HCT374DWG4 implements eight independent D-type flip-flops triggered on the rising edge of CLK, with synchronous data capture and asynchronous 3-state control via OE. Each flip-flop retains its Q output state when OE is high, regardless of CLK or D activity.
Its 3-state outputs support high-capacitance bus driving (up to 15 LSTTL loads) without external pull-ups, enabled by low-impedance active drive (±6 mA) and high-impedance leakage <0.5 μA. Input thresholds match TTL voltage levels (VIH = 2.0 V min, VIL = 0.8 V max) across 4.5–5.5 V operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL and CMOS logic rails without level shifting. |
| Propagation Delay (tpd) | 22 ns typical at 5 V, CL = 50 pF - Enables reliable operation up to 25 MHz clock frequency in buffered bus applications. |
| Output Drive | ±6 mA at 5 V - Sufficient to directly drive 15 LSTTL loads, eliminating need for external buffer stages. |
| Input Current | ≤1 μA max - Minimizes loading on upstream logic and supports high-fanout signal distribution. |
| 3-State Leakage (IOZ) | ±0.5 μA max at 5.5 V - Guarantees negligible bus contention during high-impedance mode in shared-data-path systems. |
| Setup/Hold Time | tsu = 25 ns, thh = 10 ns at 5 V - Defines minimum data stability window before and after CLK rising edge for deterministic latching. |
| Power Consumption (ICC) | 80 μA max at 5.5 V - Supports low-static-power system design while maintaining full-speed performance. |
Pinout & Package
SN74HCT374DWG4 is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, with standard 1.27 mm lead pitch and 2.65 mm maximum height per JEDEC MS-013. Pin 1 is located at the top-left corner adjacent to the index notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CLK) | Clock input | Rising-edge trigger for simultaneous latching of all eight D inputs into Q outputs. |
| 2–9 (D1–D8) | Data inputs | Asynchronous parallel data inputs synchronized to CLK edge; TTL-voltage compatible. |
| 11–18 (Q1–Q8) | True outputs | 3-state buffered outputs reflecting latched D values when OE is low; high-Z when OE is high. |
| 19 (OE) | Output-enable control | Active-low signal enabling/disabling all Q outputs; does not affect internal flip-flop state retention. |
| 10 (GND) | Ground reference | Common return path for all logic and output currents; must be low-impedance for noise immunity. |
| 20 (VCC) | Power supply | Primary 4.5–5.5 V supply rail; requires local 0.1 μF bypass capacitor per TI recommendations. |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type flip-flop architecture | Eight independent, edge-triggered storage elements in one SOIC-20 package for compact register implementation. |
| 3-state bus interface capability | Outputs switch between active drive (±6 mA) and high-impedance (<0.5 μA) states, enabling direct connection to shared data buses. |
| TTL-compatible input thresholds | VIH ≥ 2.0 V and VIL ≤ 0.8 V across full supply range - ensures interoperability with legacy 5 V TTL logic families. |
| Low static power consumption | ICC ≤ 80 μA max - reduces system-level quiescent current without sacrificing speed or drive strength. |
| Robust timing margins | 25 ns setup / 10 ns hold time at 5 V - accommodates PCB trace skew and signal integrity variations in industrial control backplanes. |
Applications
| Industrial I/O Buffering | Microcontroller Bus Expansion |
|---|---|
|
Use Scenario: Isolating and latching sensor/actuator signals in PLC I/O modules where multiple devices share a common data bus. IC Role / Device Role / Timing Role: Acts as a synchronized input latch and output driver, decoupling field-side transients from controller-side logic using OE-controlled 3-state isolation. Use Value: Eliminates need for discrete buffers or pull-up resistors, reducing BOM count and board space while ensuring glitch-free bus arbitration. |
Use Scenario: Extending GPIO count of an MCU by adding parallel-accessible register banks for peripheral control and status monitoring. IC Role / Device Role / Timing Role: Provides edge-triggered, clock-synchronized storage for 8-bit wide control/status words, with OE enabling dynamic bus sharing among multiple peripherals. Use Value: Enables deterministic read/write timing via single CLK and OE control lines, simplifying firmware register access routines and reducing software overhead. |
| Legacy System Bus Interface | Digital Test Equipment Data Capture |
|
Use Scenario: Interfacing modern microcontrollers to older ISA or VMEbus peripherals requiring 5 V-tolerant, high-drive latched data paths. IC Role / Device Role / Timing Role: Functions as a level-compatible bus transceiver and latch, translating between MCU timing domains and legacy bus protocols using programmable OE timing. Use Value: Maintains signal integrity over long traces (CL up to 150 pF) with 22 ns tpd and 6 mA drive, avoiding timing violations in mixed-generation systems. |
Use Scenario: Capturing parallel digital waveforms from DUTs in automated test fixtures where precise edge-aligned sampling is required. IC Role / Device Role / Timing Role: Serves as a high-reliability, low-jitter input sampler-latching 8-bit data on CLK rising edge with sub-ns jitter tolerance per TI characterization. Use Value: Delivers consistent 25 ns setup margin and 10 ns hold margin, enabling stable acquisition at 20+ MHz sampling rates without metastability-induced errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop with 3-state output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT574DW | Identical electrical specs and pinout; differs only in output-enable polarity (active-high vs. SN74HCT374's active-low OE). | Requires inverted OE control logic; unsuitable where existing firmware relies on active-low assertion timing. | Select SN74HCT574DW only if system-level OE signal generation can accommodate active-high control without redesign. |
| 74ACT374SCX | Higher speed (tpd = 9 ns typ), wider VCC range (4.5–5.5 V), but higher ICC (40 mA max) and no guaranteed TTL input compatibility. | Better for high-frequency test equipment; less suitable for mixed-logic systems relying on TTL voltage thresholds. | Choose 74ACT374SCX when >25 MHz operation is mandatory and power budget allows 50× higher static current than SN74HCT374DWG4. |
Compared with SN74HCT374DWG4, SN74HCT574DW offers identical timing and drive but requires OE logic inversion, while 74ACT374SCX trades higher power and reduced input compatibility for nearly 2.5× faster propagation-making SN74HCT374DWG4 optimal for cost-sensitive, noise-immune, and legacy-compatible bus interfacing.
Availability
SN74HCT374DWG4 is available at Aetrix Electronics and suitable for industrial I/O buffering, microcontroller bus expansion, and legacy system bus interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for SN74HCT374DWG4 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, with over 90 years of innovation in logic, power management, and signal chain technologies.
SN74HCT374DWG4 belongs to the SNx4HCT logic family designed specifically for 5 V TTL-compatible digital systems requiring robust noise immunity, predictable timing, and bus-oriented 3-state interface capability.
FAQ
What is the recommended bypass capacitor for SN74HCT374DWG4?
A 0.1 μF ceramic capacitor is recommended for SN74HCT374DWG4, placed as close as possible to the VCC and GND pins. TI specifies this value to suppress high-frequency noise and maintain stable supply voltage during output switching transitions. The capacitor must be rated for ≥10 V and mounted with minimal trace inductance to ensure effective decoupling across the device's 25 MHz operational bandwidth.
Does SN74HCT374DWG4 support mixed-voltage operation with 3.3 V logic?
No, SN74HCT374DWG4 does not support reliable mixed-voltage operation with 3.3 V logic. Its inputs require VIH ≥ 2.0 V and VIL ≤ 0.8 V under 4.5–5.5 V supply, and it lacks 3.3 V tolerant input structure. Driving SN74HCT374DWG4 inputs directly from 3.3 V logic risks marginal VIH compliance and increased susceptibility to noise-induced glitches.
What happens to the Q outputs of SN74HCT374DWG4 when OE is high?
When OE is high, all eight Q outputs of SN74HCT374DWG4 enter high-impedance (Hi-Z) state, drawing ≤0.5 μA leakage current. Internal flip-flop states remain unchanged-data latched prior to OE assertion is preserved-and CLK and D inputs continue to function normally. This allows concurrent data updates while outputs are isolated from the bus.
Can SN74HCT374DWG4 drive a 150 pF capacitive load reliably?
Yes, SN74HCT374DWG4 is characterized for CL = 150 pF operation: tpd increases to 52 ns max at 5.5 V, and output rise/fall times remain within 48 ns. TI's datasheet confirms functionality up to this load, making it suitable for long-trace backplanes and multi-drop bus configurations where distributed capacitance exceeds 100 pF.
Is SN74HCT374DWG4 pin-compatible with SN74LS374N?
No, SN74HCT374DWG4 is not pin-compatible with SN74LS374N. While both are octal D-type flip-flops in 20-pin packages, SN74LS374N uses PDIP (N) packaging with different pin assignments-including separate GND/VCC placements and non-matching CLK/OE locations. Physical mounting and PCB layout are incompatible between these families.
SN74HCT374DWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- 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:
- 40 MHz
- Max Propagation Delay @ V, Max CL:
- 32ns @ 5.5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74HCT374DWG4 FAQ
1.How can I place an order for SN74HCT374DWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT374DWG4 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 SN74HCT374DWG4 reliable?
The price and inventory of SN74HCT374DWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT374DWG4 is usually 5 days.
3.What payment methods are accepted for SN74HCT374DWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT374DWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCT374DWG4?
SN74HCT374DWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT374DWG4 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 SN74HCT374DWG4?
For technical support, including SN74HCT374DWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT374DWG4 requirements.
6.How does Aetrix verify that SN74HCT374DWG4 is sourced from the original manufacturer or authorized distributors?
All SN74HCT374DWG4 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 SN74HCT374DWG4 meets industry standards.
7.What is the process for return or replacement of SN74HCT374DWG4?
All SN74HCT374DWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT374DWG4, 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 SN74HCT374DWG4 part is unused and in its original packaging.
Return procedure for SN74HCT374DWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74HCT374DWG4 Tags
-
SN74HC74DR
Texas Instruments
-
SN74HC74PWR
Texas Instruments
-
74LVC1G74GT,115
Nexperia USA Inc.
-
SN74LVC2G74DCUR
Texas Instruments
-
CD4013BM96
Texas Instruments
-
SN74HCT273PWR
Texas Instruments
-
SN74LVC1G74DCUR
Texas Instruments
-
SN74HC574DWR
Texas Instruments
-
74LVC1G74DC,125
Nexperia USA Inc.
-
SN74HC273DWR
Texas Instruments
-
SN74HCT574DWR
Texas Instruments
-
SN74LVC1G74DCTR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
