My Inquiry
My Account
Texas Instruments CD74HCT374EE4
- Part No.:
- CD74HCT374EE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74HCT374EE4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,636
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CD74HCT374EE4 from Texas Instruments is an octal D-type flip-flop with 3-state outputs, positive-edge clock triggering, and LSTTL-compatible inputs. It operates at 4.5 V to 5.5 V, delivers 15 ns typical propagation delay (VCC = 5 V, CL = 15 pF), supports –55°C to +125°C operation, and drives up to 15 LSTTL loads - used in bus-oriented data latching and interface isolation in industrial control backplanes.
For engineers reviewing the CD74HCT374EE4 datasheet, CD74HCT374EE4 pinout, CD74HCT374EE4 application, or CD74HCT374EE4 equivalent, key selection criteria include its HCT-level input compatibility (VIH = 2 V min, VIL = 0.8 V max), 3-state output enable independence from register operation, and PDIP-20 package suitability for through-hole prototyping and legacy board replacement.
Technical Context
The CD74HCT374EE4 implements eight edge-triggered D flip-flops sharing a common clock (CP) and output enable (OE) control. Data is latched on the LOW-to-HIGH transition of CP; OE asserts high-impedance state independently of clock activity. Its logic thresholds match standard LSTTL, enabling direct interfacing with legacy TTL systems without level-shifting.
It features buffered inputs, balanced propagation/transition times, and CMOS power efficiency versus bipolar TTL. The device exhibits 100% tested DC parameters across temperature, with guaranteed switching performance up to 25 MHz at –40°C to +85°C and 20 MHz over full –55°C to +125°C range under specified load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) ensure drop-in replacement for 74LS374 in mixed-logic systems. |
| Supply Voltage Range | 4.5 V to 5.5 V - mandates stable 5 V rail; excludes operation below 4.5 V or above 5.5 V per absolute ratings. |
| Propagation Delay (tPLH/tPHL) | 15 ns typical at VCC = 5 V, CL = 15 pF - enables reliable 60 MHz maximum clock rate in low-capacitance bus environments. |
| Output Drive Capability | 15 LSTTL loads - supports fanout to multiple legacy TTL inputs without external buffers in industrial I/O modules. |
| Operating Temperature | –55°C to +125°C - qualified for extended-range applications including aerospace avionics and downhole oilfield electronics. |
| Quiescent Current (ICC) | ≤160 μA at –55°C to +125°C - ensures minimal standby power in battery-backed or thermally constrained embedded controllers. |
| Input Leakage Current | ±1 μA max at VI = VCC or GND - eliminates significant loading on high-impedance sensor or reference signal lines. |
Pinout & Package
CD74HCT374EE4 uses a 20-pin Plastic Dual In-line Package (PDIP-N), body size 25.40 mm × 6.35 mm, with standard 0.3-inch row spacing and 0.1-inch pin pitch. Pin 1 is marked by a notch or dot; pin numbering follows counterclockwise convention from top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CP) | Clock Input | Positive-edge sensitive; triggers simultaneous latching of all eight D inputs into respective Q outputs. |
| 2–9 (D0–D7) | Data Inputs | Asynchronous inputs accepted continuously; only sampled on rising CP edge. |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and output current; must be low-impedance connection. |
| 11–18 (Q0–Q7) | 3-State Outputs | Driven high/low when OE = LOW; enter high-Z when OE = HIGH - enables shared-bus contention avoidance. |
| 19 (OE) | Output Enable | Active-low control; independent of CP - allows output gating without affecting stored register state. |
| 20 (VCC) | Power Supply | 5 V ±5% supply input; requires local 0.1 μF ceramic bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| LSTTL-Compatible Inputs | VIH ≥ 2 V and VIL ≤ 0.8 V at VCC = 5 V - eliminates need for external level translators when interfacing with 74LS/ALS families. |
| Independent Output Enable | OE controls all eight outputs simultaneously without affecting internal register contents - supports dynamic bus arbitration in real-time systems. |
| High Noise Immunity | NIL/NIL = 30% of VCC - suppresses false triggering from EMI in motor drive or power supply proximity. |
| Low Power Consumption | ICC ≤ 160 μA over full temperature range - reduces thermal load in densely packed industrial PLC modules. |
| Wide Temperature Operation | –55°C to +125°C - validated for deployment in unheated outdoor enclosures and engine bay electronics. |
Applications
| Industrial PLC I/O Expansion | Legacy System Bus Interface |
|---|---|
Use Scenario: Adding digital input latching capability to a programmable logic controller's expansion backplane using existing 5 V TTL infrastructure. IC Role / Device Role / Timing Role: Octal D flip-flop capturing parallel sensor status signals synchronized to a system clock; 3-state outputs isolate latched data from shared data bus during non-read cycles. Use Value: Enables deterministic sampling of 8-bit status words without bus contention, leveraging native LSTTL compatibility to avoid redesign of legacy backplane wiring. |
Use Scenario: Interfacing a modern microcontroller unit (MCU) with an older peripheral subsystem using 74LS-series logic levels and timing. IC Role / Device Role / Timing Role: Level-translating and synchronizing 8-bit address/data transfers between MCU GPIO and legacy TTL peripherals via common bus architecture. Use Value: Eliminates discrete resistor networks or dedicated level shifters; provides precise edge-aligned capture and controlled bus release via OE. |
| Avionics Data Acquisition Module | Test Equipment Signal Conditioning |
Use Scenario: Capturing analog-to-digital converter (ADC) output words in a flight-critical data acquisition unit operating across extreme ambient temperatures. IC Role / Device Role / Timing Role: High-reliability latching element holding digitized sensor values until read by host processor; operates across –55°C to +125°C without derating. Use Value: Meets extended temperature qualification for airborne systems while maintaining sub-20 ns timing margins for deterministic sampling windows. |
Use Scenario: Building modular test fixtures that condition and route digital stimulus/response signals between ATE instruments and UUTs. IC Role / Device Role / Timing Role: Bidirectional bus buffer providing direction-controlled data flow and glitch-free state transitions during test sequence execution. Use Value: Prevents signal corruption during test mode switching via fast, predictable 3-state enable/disable timing (tPZL/tPZH ≤ 45 ns). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT374N | Identical logic function, pinout, and electrical specs; TI second-source part with identical PDIP-20 packaging and marking. | No functional difference; fully interchangeable in all designs using CD74HCT374EE4. | Select SN74HCT374N when sourcing from alternate TI distribution channels or requiring dual-sourced BOM compliance. |
| 74ACT374PC | Higher drive strength (24 mA vs. 6 mA sink/source), faster propagation (8 ns typ), but requires 4.5–5.5 V and has higher ICC (40 μA typical vs. 8 μA). | Better suited for high-speed, high-fanout buses; not recommended where ultra-low quiescent current or strict LSTTL voltage compatibility is required. | Choose 74ACT374PC only if timing margin is insufficient with CD74HCT374EE4 and additional power budget is available. |
Compared with SN74HCT374N, CD74HCT374EE4 offers identical functionality and qualification; compared with 74ACT374PC, it trades speed and drive for lower power and tighter LSTTL voltage alignment - making it optimal for cost-sensitive, thermally constrained, or legacy-TTL-matched systems.
Availability
CD74HCT374EE4 is available at Aetrix Electronics and suitable for industrial control systems, avionics data acquisition modules, and legacy test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HCT374EE4 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, embedded processing, and logic solutions with emphasis on reliability, longevity, and industrial-grade qualification.
CD74HCT374EE4 belongs to TI's legacy HCT logic family, designed specifically for seamless integration into mixed-technology systems where TTL compatibility, wide temperature operation, and robust 3-state bus control are essential.
FAQ
What is the maximum clock frequency supported by CD74HCT374EE4?
The CD74HCT374EE4 supports a maximum clock frequency of 25 MHz over the –40°C to +85°C range and 20 MHz across its full –55°C to +125°C operating temperature range, as verified under CL = 50 pF load conditions per the official TI datasheet SCHS183E.
Does CD74HCT374EE4 require external pull-up or pull-down resistors on unused inputs?
Yes - all unused inputs on CD74HCT374EE4 must be tied to VCC or GND per TI layout guidelines. Floating inputs can cause undefined logic states, increased power consumption, or oscillation due to internal gate threshold sensitivity; no internal termination is provided.
Can CD74HCT374EE4 directly replace a 74LS374 in an existing design?
Yes - CD74HCT374EE4 is pin-compatible and electrically compatible with 74LS374, offering identical pinout, LSTTL input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V), and 3-state output behavior. No PCB changes or schematic modifications are required for drop-in replacement.
What is the purpose of the OE pin on CD74HCT374EE4?
The OE (Output Enable) pin on CD74HCT374EE4 is an active-low control that places all eight Q outputs into high-impedance state when asserted HIGH. It operates independently of the clock signal, allowing bus isolation without disturbing the latched data stored in the flip-flop registers.
Is CD74HCT374EE4 RoHS compliant?
Yes - CD74HCT374EE4 is RoHS compliant, as confirmed in TI's Package Option Addendum (Rev. 2026-07-15), listing "Yes" under RoHS column for orderable part number CD74HCT374EE4 with NIPDAU lead finish and PDIP (N) package.
CD74HCT374EE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 60 MHz
- Max Propagation Delay @ V, Max CL:
- 33ns @ 4.5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 10 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
CD74HCT374EE4 FAQ
1.How can I place an order for CD74HCT374EE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT374EE4 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 CD74HCT374EE4 reliable?
The price and inventory of CD74HCT374EE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT374EE4 is usually 5 days.
3.What payment methods are accepted for CD74HCT374EE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT374EE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT374EE4?
CD74HCT374EE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT374EE4 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 CD74HCT374EE4?
For technical support, including CD74HCT374EE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT374EE4 requirements.
6.How does Aetrix verify that CD74HCT374EE4 is sourced from the original manufacturer or authorized distributors?
All CD74HCT374EE4 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 CD74HCT374EE4 meets industry standards.
7.What is the process for return or replacement of CD74HCT374EE4?
All CD74HCT374EE4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT374EE4, 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 CD74HCT374EE4 part is unused and in its original packaging.
Return procedure for CD74HCT374EE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CD74HCT374EE4 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…
