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Texas Instruments CD74HCT74MTE4
- Part No.:
- CD74HCT74MTE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HCT74MTE4.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,184
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Product details
Overview
CD74HCT74MTE4 from Texas Instruments is a dual D-type positive-edge-triggered flip-flop with independent asynchronous clear and preset inputs per channel, operating across 4.5 V to 5.5 V supply range, supporting clock frequencies up to 29 MHz at 5 V, and rated for –55°C to +125°C industrial temperature operation - used in clock division, toggle switching, and synchronous state-holding circuits.
For engineers reviewing the CD74HCT74MTE4 datasheet, CD74HCT74MTE4 pinout, CD74HCT74MTE4 application, or CD74HCT74MTE4 equivalent, key selection considerations include its TTL-compatible input thresholds, dual-channel edge-triggered storage behavior, SOIC-14 package footprint, and guaranteed timing performance under full industrial temperature and voltage conditions.
Technical Context
The CD74HCT74MTE4 implements two independent D-type latches synchronized to the rising edge of CLK, each with active-low asynchronous PRE and CLR enabling immediate state forcing regardless of clock phase. Its HCT logic family ensures TTL-level input compatibility while maintaining CMOS output drive strength and low static power consumption.
Each channel supports setup/hold times of 13 ns/3 ns (min) at 5 V, propagation delays as low as 37 ns (max), and operates reliably with capacitive loads ≤50 pF. The device uses standard CMOS push-pull outputs capable of sourcing/sinking ±4 mA at VOH/VOL specifications, with input leakage <±1 µA and supply current ICC ≤80 µA at 6 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible inputs, CMOS outputs, enables direct interfacing with legacy 74LS systems without level shifters |
| Supply Voltage Range | 4.5 V to 5.5 V - matches standard 5 V TTL/CMOS rails; not rated for 2–6 V like HC variants |
| Max Clock Frequency | 29 MHz at 5 V, TA = –55°C to +125°C - guarantees reliable toggling in high-speed control loops |
| Propagation Delay (tpd) | 37 ns max (Q, Q̅ from CLK), CL = 50 pF - defines minimum clock-to-output latency in synchronous designs |
| Input Thresholds (VIH/VIL) | VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5 V - ensures robust noise margin against TTL logic levels |
| Operating Temperature | –55°C to +125°C - qualified for aerospace, automotive under-hood, and industrial motor-control environments |
| Output Drive | ±4 mA at VOH/VOL - sufficient to drive 10 LSTTL loads or directly interface with microcontroller GPIOs |
Pinout & Package
CD74HCT74MTE4 is housed in a 14-pin SOIC (D) package measuring 8.70 mm × 3.90 mm, with standard 1.27 mm pitch, gull-wing leads, and RoHS-compliant NiPdAu finish. It is rated MSL Level-1 with unlimited floor life and peak reflow tolerance of 260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13 | Channel 1 & 2 Clear (Active Low) | Asynchronous reset: forces Q = 0, Q̅ = 1 independent of CLK; must be pulled high via ≥10 kΩ resistor if unused |
| 2, 12 | Channel 1 & 2 Data Input (D) | Stores logic level on rising CLK edge; tied to Q̅ for toggle mode operation |
| 3, 11 | Channel 1 & 2 Clock Input (CLK) | Positive-edge-triggered; requires clean, fast-rising edges (tr ≤ 400 ns at 6 V) to avoid metastability |
| 4, 10 | Channel 1 & 2 Preset (Active Low) | Asynchronous set: forces Q = 1, Q̅ = 0; overrides CLK and D when asserted |
| 5, 9 | Channel 1 & 2 True Output (Q) | Non-inverted registered output; fanout limited to 10 LSTTL loads or ≤50 pF capacitive load |
| 6, 8 | Channel 1 & 2 Complement Output (Q̅) | Inverted registered output; used for toggle feedback or differential signaling paths |
| 7 | Ground (GND) | Reference return path for all signals and supply current; requires low-inductance connection to PCB ground plane |
| 14 | Positive Supply (VCC) | 5 V nominal supply; requires 0.1 µF ceramic decoupling capacitor placed within 3 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Inputs | VIH = 2.0 V min / VIL = 0.8 V max at 4.5 V - eliminates need for external level translators when interfacing with 74LS or microcontroller outputs |
| Dual Independent Channels | Two fully isolated DFFs share only VCC/GND - enables compact implementation of 2-bit registers or independent clock dividers |
| Asynchronous Control | Separate PRE/CLR per channel - allows precise initialization, forced reset, or fault recovery without waiting for next clock edge |
| Industrial Temperature Range | –55°C to +125°C operation - validated for use in engine control units, power inverters, and downhole instrumentation |
| Low Static Power | ICC ≤ 80 µA at 6 V - reduces system standby power and thermal load in battery-backed or always-on applications |
Applications
| Toggle Switch Emulation | Divide-by-2 Clock Generation |
|---|---|
Use Scenario: Replacing mechanical toggle switches in space-constrained user interfaces or remote controls using momentary pushbuttons. IC Role / Device Role / Timing Role: CD74HCT74MTE4 acts as a synchronous edge-triggered state latch; D input tied to Q̅, CLK driven by debounced switch signal. Use Value: Eliminates mechanical wear, reduces BOM cost, and enables PCB-mount integration with no moving parts or contact bounce. | Use Scenario: Generating a 50% duty-cycle square wave at half the frequency of a master system clock in digital PLLs or data sampling circuits. IC Role / Device Role / Timing Role: CD74HCT74MTE4 functions as a single-stage binary divider; Q output taken as divided clock, CLK fed with master clock, D tied to Q̅. Use Value: Provides deterministic 2× frequency reduction with sub-40 ns propagation delay and zero jitter accumulation from internal logic. |
| State Retention in Power-Gated Systems | Synchronous Reset Sequencing |
Use Scenario: Preserving critical control states during brief power interruptions in industrial PLC modules or smart metering hardware. IC Role / Device Role / Timing Role: CD74HCT74MTE4 serves as non-volatile state latch; PRE/CLR held inactive, Q outputs feed enable logic for downstream regulators or I/O drivers. Use Value: Maintains functional state across brown-out events without external EEPROM or backup power, leveraging low ICC and wide VCC tolerance. | Use Scenario: Coordinating safe startup/shutdown of multi-rail power supplies or FPGA configuration sequences requiring precise reset ordering. IC Role / Device Role / Timing Role: CD74HCT74MTE4 provides edge-aligned, glitch-free reset assertion; cascaded CLK/Q paths generate staggered reset pulses with defined setup/hold margins. Use Value: Ensures deterministic power sequencing without race conditions, meeting ASIC/FPGA vendor requirements for TPS6598x or Xilinx Zynq boot reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT74DR | Same HCT logic, identical pinout, but in SOIC-14 with different tape-and-reel packaging (2500 pcs/reel vs. 250 pcs/reel); same electrical specs and temp range | Identical functional behavior; differs only in packaging format and reel quantity - suitable for high-volume SMT lines requiring large reels | Select SN74HCT74DR when optimizing for automated placement throughput and minimizing reel changeovers in mass production. |
| CD74HC74M96 | HC-family variant: wider 2–6 V supply range, higher VIH/VIL thresholds (3.15 V/1.35 V at 4.5 V), slower max fCLK (25 MHz), and reduced drive (±5.2 mA) | Not TTL-compatible; requires level-shifting for LS/ALS interface; better suited for mixed-voltage battery-powered systems than industrial 5 V rails | Choose CD74HC74M96 only when operating outside 4.5–5.5 V or needing broader supply flexibility - not a drop-in replacement for CD74HCT74MTE4. |
Compared with SN74HCT74DR, CD74HCT74MTE4 offers identical logic functionality but optimized for medium-batch assembly with smaller reels; versus CD74HC74M96, it delivers guaranteed TTL interoperability and faster timing at 5 V, making it the preferred choice for legacy-compatible industrial control designs.
Availability
CD74HCT74MTE4 is available at Aetrix Electronics and suitable for industrial automation controllers, aerospace telemetry modules, and automotive body electronics requiring stable component supply across extended temperature and long product lifecycles.
Supply support for CD74HCT74MTE4 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 for industrial, automotive, and communications markets.
The CD74HCT74MTE4 belongs to TI's 74HCT logic family, engineered specifically to bridge TTL and CMOS domains in mission-critical systems where interoperability, timing predictability, and extended temperature resilience are mandatory.
FAQ
What is the recommended bypass capacitor value for CD74HCT74MTE4?
A 0.1 µF ceramic capacitor is recommended for CD74HCT74MTE4, placed physically adjacent to the VCC pin (Pin 14) and connected directly to GND (Pin 7) with minimal trace length. This value suppresses high-frequency supply noise generated during output transitions. For systems with additional low-frequency ripple, a parallel 1 µF tantalum or ceramic capacitor may be added, but the 0.1 µF unit remains essential for transient response.
Does CD74HCT74MTE4 support 3.3 V operation?
No, CD74HCT74MTE4 is not specified for 3.3 V operation. Its absolute maximum ratings allow VCC up to 7 V, but the HCT family is characterized only from 4.5 V to 5.5 V. At 3.3 V, input thresholds become undefined, timing parameters degrade unpredictably, and output drive falls outside specification. For 3.3 V systems, consider the SN74LVC74A or CD74AC74 instead.
Can unused inputs on CD74HCT74MTE4 be left floating?
No, unused inputs on CD74HCT74MTE4 must never be left floating. Each input - including PRE, CLR, D, and CLK - must be terminated to a defined logic level (VCC or GND) via direct connection or a pull-up/pull-down resistor (typically 10 kΩ). Floating inputs cause excessive current draw, erratic switching, and potential device latch-up due to internal CMOS gate instability.
What is the maximum capacitive load CD74HCT74MTE4 can drive reliably?
CD74HCT74MTE4 is characterized for reliable operation with a total capacitive load ≤50 pF per output, as verified in its switching characteristics table. Driving >50 pF increases propagation delay, degrades edge rate, and risks overshoot/ringing. If larger loads are unavoidable, add a series resistor (e.g., 33 Ω) between output and load to limit peak current and dampen reflections - ensuring IO remains within ±4 mA limits.
Is CD74HCT74MTE4 pin-compatible with CD74HC74M?
Yes, CD74HCT74MTE4 is pin-compatible with CD74HC74M in the SOIC-14 package, sharing identical pin numbering and physical footprint. However, they differ electrically: CD74HCT74MTE4 has TTL-compatible inputs and tighter 4.5–5.5 V supply spec, while CD74HC74M supports 2–6 V but requires CMOS-level inputs. Swapping them requires verifying voltage domain compatibility and timing margins.
CD74HCT74MTE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Function:
- Set(Preset) and Reset
- Type:
- D-Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 50 MHz
- Max Propagation Delay @ V, Max CL:
- 35ns @ 4.5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 4mA, 4mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 10 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
CD74HCT74MTE4 FAQ
1.How can I place an order for CD74HCT74MTE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT74MTE4 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 CD74HCT74MTE4 reliable?
The price and inventory of CD74HCT74MTE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT74MTE4 is usually 5 days.
3.What payment methods are accepted for CD74HCT74MTE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT74MTE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT74MTE4?
CD74HCT74MTE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT74MTE4 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 CD74HCT74MTE4?
For technical support, including CD74HCT74MTE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT74MTE4 requirements.
6.How does Aetrix verify that CD74HCT74MTE4 is sourced from the original manufacturer or authorized distributors?
All CD74HCT74MTE4 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 CD74HCT74MTE4 meets industry standards.
7.What is the process for return or replacement of CD74HCT74MTE4?
All CD74HCT74MTE4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT74MTE4, 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 CD74HCT74MTE4 part is unused and in its original packaging.
Return procedure for CD74HCT74MTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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