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Texas Instruments CD74HCT174EG4
- Part No.:
- CD74HCT174EG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74HCT174EG4.pdf
- Description:
- IC FF D-TYPE SNGL 6BIT 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,144
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Product details
Overview
CD74HCT174EG4 from Texas Instruments is a hex D-type flip-flop with asynchronous common reset, designed for synchronous data latching in digital control and timing circuits. It features positive-edge clock triggering, 4.5V–5.5V operation, 60ns max setup time at 5V, 50ns max propagation delay (clock to Q), and operates across –55°C to +125°C for industrial and aerospace applications.
For engineers reviewing the CD74HCT174EG4 datasheet, CD74HCT174EG4 pinout, CD74HCT174EG4 application, or CD74HCT174EG4 equivalent, key selection criteria include LSTTL-compatible input thresholds (VIH ≥ 2V, VIL ≤ 0.8V), fanout of 10 LSTTL loads, MR-controlled synchronous reset behavior, and PDIP-16 packaging for through-hole prototyping and legacy board compatibility.
Technical Context
The CD74HCT174EG4 implements six independent master-slave D flip-flops sharing a single buffered clock (CP) and common asynchronous reset (MR). Its silicon-gate CMOS architecture delivers TTL-compatible input logic levels while maintaining CMOS power efficiency - quiescent current ≤160µA over full temperature range.
It requires strict timing adherence: minimum clock pulse width of 25ns, setup time of 20ns, hold time of 5ns, and removal time of 15ns (MR to CP) at 5V. Output drive capability is specified for standard LSTTL loads only, with VOH ≥ 3.7V and VOL ≤ 0.4V under 4mA sink/source conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible inputs, CMOS outputs, 4.5–5.5V supply |
| Clock Edge | Positive-edge triggered - data latched on low-to-high CP transition |
| Reset Type | Asynchronous active-low MR - forces all Q outputs low regardless of clock state |
| Propagation Delay | ≤60ns (max, CL = 50pF, VCC = 5V) - determines maximum system clock frequency (~17MHz) |
| Fanout Capability | 10 LSTTL loads - supports direct interfacing with legacy TTL logic without buffers |
| Operating Temperature | –55°C to +125°C - qualified for extended industrial, automotive under-hood, and military-grade systems |
| Input Voltage Thresholds | VIH ≥ 2.0V, VIL ≤ 0.8V - ensures reliable recognition of standard TTL logic levels |
Pinout & Package
CD74HCT174EG4 is supplied in a 16-pin plastic dual in-line package (PDIP), with 0.3-inch body width and through-hole mounting. Pin 1 is located at the top-left corner when viewed from the top with notch or dot orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Master Reset | Active-low asynchronous reset - overrides clock and forces all Qn = L |
| 2–7, 9–14 (D0–D5) | Data Inputs | Independent D inputs for each of six flip-flops; sampled on CP rising edge |
| 3, 5, 7, 10, 12, 15 (Q0–Q5) | True Outputs | Complementary Q outputs - no inverted outputs provided on this device |
| 8 (GND) | Ground | Reference return path for all signals and power; must be low-impedance |
| 16 (VCC) | Supply Voltage | +4.5V to +5.5V DC - decoupling capacitor (0.1µF) required near pin |
| 13 (CP) | Clock Input | Buffered positive-edge-triggered clock - internal Schmitt trigger not present |
Key Features
| Feature | Design Value |
|---|---|
| Direct LSTTL input compatibility | Eliminates level-shifting circuitry when interfacing with 74LS-series logic |
| Asynchronous MR with guaranteed reset timing | Ensures deterministic system initialization without dependency on clock alignment |
| Low quiescent power consumption | ICC ≤ 160µA over full temperature range - enables use in thermally constrained environments |
| High noise immunity | NIH/NIL = 30% of VCC at 5V - improves robustness in electrically noisy industrial settings |
| Wide temperature operation | Validated performance from –55°C to +125°C - suitable for uncontrolled ambient deployments |
Applications
| Industrial PLC I/O Expansion | Digital Test Equipment Control |
|---|---|
Use Scenario: Latching parallel sensor status bits from analog-to-digital converter output buses before scan-cycle readout. IC Role / Device Role / Timing Role: Hex D-type flip-flop providing synchronized capture of 6-bit status word on system clock edge. Use Value: Enables deterministic sampling window aligned to main controller cycle; MR allows global fault-clear synchronization. | Use Scenario: Holding test pattern data during automated functional testing of digital subsystems. IC Role / Device Role / Timing Role: Data register staging test vectors prior to application to device-under-test inputs. Use Value: Provides stable, glitch-free signal presentation; fanout supports driving multiple DUT inputs simultaneously. |
| Avionics Data Acquisition Interface | Legacy Instrumentation Bus Interface |
Use Scenario: Capturing discrete switch or relay states in flight control monitoring systems. IC Role / Device Role / Timing Role: Synchronized input register buffering pilot/crew interface signals into real-time processing domain. Use Value: Wide temperature range and MR-based fail-safe reset meet DO-160 environmental and safety requirements. | Use Scenario: Interfacing modern microcontrollers with older 74LS-based backplane logic. IC Role / Device Role / Timing Role: Level-translating and timing-synchronizing bridge between MCU GPIO and TTL bus. Use Value: Eliminates need for external translators; pinout matches LS174 for drop-in replacement in field upgrades. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar hex D-type flip-flop with reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT174N | Same HCT logic family, identical pinout and AC/DC specs; TI second-source with identical thermal ratings | No functional deviation - fully interchangeable in existing PDIP-16 layouts | Select when requiring TI's current production status and RoHS-compliant NIPDAU finish |
| MC74HCT174PG | Onsemi variant; same electrical specs but different MSL rating (Level-1 vs N/A) and marking format | Valid for same industrial temp range; minor differences in tape-and-reel packaging and traceability | Prefer for multi-source procurement strategies where long-term obsolescence mitigation is prioritized |
Compared with SN74HCT174N and MC74HCT174PG, the CD74HCT174EG4 offers identical timing, voltage, and drive characteristics but is distinguished by its Harris-era datasheet heritage, specific PDIP-16 tube packaging (25 pcs), and legacy part marking "CD74HCT174E" - making it ideal for maintenance of legacy designs originally specified with CD-prefix TI/Harris devices.
Availability
CD74HCT174EG4 is available at Aetrix Electronics and suitable for industrial control systems, avionics data acquisition modules, and legacy instrumentation bus interfaces requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD74HCT174EG4 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 U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions for industrial, automotive, and aerospace markets.
The CD74HCT174EG4 belongs to TI's legacy high-speed CMOS logic portfolio, engineered specifically for drop-in replacement of bipolar TTL registers while delivering lower power and enhanced noise immunity in harsh-environment applications.
FAQ
What is the maximum operating frequency of the CD74HCT174EG4?
The CD74HCT174EG4 supports a maximum clock frequency of 17 MHz at VCC = 5V and TA = –55°C to +125°C, based on worst-case propagation delay (tPLH/tPHL ≤ 60 ns) and minimum pulse width (tw ≥ 25 ns). This limit ensures reliable setup/hold timing margins across full temperature and voltage ranges, and applies to all six flip-flops simultaneously.
Does the CD74HCT174EG4 have complementary Q-bar outputs?
No, the CD74HCT174EG4 provides only true Q outputs (Q0–Q5); it does not include complementary (Q̅) outputs. Each flip-flop is implemented as a single-output D-type register. If inverted outputs are required, external inverters or a device such as CD74HCT175 (which provides both Q and Q̅) must be used.
Can the CD74HCT174EG4 operate at 3.3V?
No, the CD74HCT174EG4 is an HCT-family device rated strictly for 4.5V to 5.5V operation. At 3.3V, input thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V) become unreliable, and output drive strength degrades significantly. For 3.3V systems, consider the HC-family CD74HC174E (2V–6V) or dedicated 3.3V logic equivalents like SN74LVC174A.
Is the CD74HCT174EG4 pin-compatible with the 74LS174?
Yes, the CD74HCT174EG4 is functionally and pin-compatible with the 74LS174, including identical pin assignments, truth table behavior, and reset/clock timing relationships. Its TTL-compatible inputs and output drive allow direct substitution without PCB modification, though designers must verify VCC regulation and decoupling meet HCT requirements.
What is the purpose of the "G4" suffix in CD74HCT174EG4?
The "G4" suffix in CD74HCT174EG4 denotes a Green (RoHS-compliant) version with NiPdAu (NIPDAU) lead finish, introduced by Texas Instruments to indicate compliance with lead-free manufacturing standards. It replaces earlier "E"-suffix variants that used SnPb finishes, and maintains identical electrical, thermal, and mechanical specifications.
CD74HCT174EG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 6
- Clock Frequency:
- 25 MHz
- Max Propagation Delay @ V, Max CL:
- 40ns @ 4.5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 4mA, 4mA
- 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:
- 16-PDIP
CD74HCT174EG4 FAQ
1.How can I place an order for CD74HCT174EG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT174EG4 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 CD74HCT174EG4 reliable?
The price and inventory of CD74HCT174EG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT174EG4 is usually 5 days.
3.What payment methods are accepted for CD74HCT174EG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT174EG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT174EG4?
CD74HCT174EG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT174EG4 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 CD74HCT174EG4?
For technical support, including CD74HCT174EG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT174EG4 requirements.
6.How does Aetrix verify that CD74HCT174EG4 is sourced from the original manufacturer or authorized distributors?
All CD74HCT174EG4 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 CD74HCT174EG4 meets industry standards.
7.What is the process for return or replacement of CD74HCT174EG4?
All CD74HCT174EG4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT174EG4, 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 CD74HCT174EG4 part is unused and in its original packaging.
Return procedure for CD74HCT174EG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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