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Texas Instruments CD74ACT74ME4
- Part No.:
- CD74ACT74ME4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74ACT74ME4.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,718
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Product details
Overview
CD74ACT74ME4 from Texas Instruments is a dual positive-edge-triggered D-type flip-flop with independent asynchronous clear and preset inputs per channel, operating at 5 V supply, delivering ±24 mA output drive, 85 MHz max clock frequency, and TTL-compatible input thresholds - used in synchronous logic control, state machine sequencing, and data latching in industrial timing circuits.
For engineers reviewing the CD74ACT74ME4 datasheet, CD74ACT74ME4 pinout, CD74ACT74ME4 application, or CD74ACT74ME4 equivalent, key selection criteria include its dual-channel edge-triggered architecture, guaranteed operation from –55°C to 125°C, balanced propagation delays (2.4–9.5 ns), SCR-latchup-resistant CMOS process, and compatibility with legacy TTL logic families.
Technical Context
This device implements two independent D-type flip-flops sharing no internal coupling, each with dedicated asynchronous active-low PRE and CLR inputs, rising-edge-sensitive CLK, and complementary Q/Q outputs. Its logic behavior follows strict setup/hold timing (tsu = 4 ns, th = 0 ns at 25°C) and supports fanout to 15 F-family devices.
The CD74ACT74ME4 uses an advanced ACT (Advanced CMOS Technology) process enabling bipolar-speed performance with CMOS power efficiency. It features ESD protection exceeding 2 kV HBM, operates across full military temperature range (–55°C to 125°C), and maintains stable VOH ≥ 3.94 V and VOL ≤ 0.36 V under 24 mA load at VCC = 4.5 V.
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 systems without level-shifting. |
| Max Clock Frequency | 85 MHz (–55°C to 125°C) - enables high-speed state transitions in real-time control loops and digital counters. |
| Output Drive | ±24 mA - directly drives multiple F-family loads or small LEDs without external buffers. |
| Propagation Delay | tPLH/tPHL = 2.4–9.5 ns - guarantees predictable timing margins in synchronous designs with tight setup/hold windows. |
| Input Compatibility | TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V) - allows seamless interfacing with legacy 74LS and 74F logic outputs. |
| ESD Protection | ±2000 V HBM - meets MIL-STD-883 requirement for robust handling in manufacturing and field environments. |
| Operating Temperature | –55°C to 125°C - qualified for aerospace, defense, and under-hood automotive applications requiring extended thermal range. |
Pinout & Package
CD74ACT74ME4 is packaged in a 14-pin SOIC (D package), body size 8.65 mm × 3.9 mm, total footprint 8.65 mm × 6 mm, 1.75 mm max height, RoHS-compliant NIPDAU lead finish, MSL Level-1 rated for unlimited reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLR | Asynchronous clear input (Channel 1) | Active-low signal forcing Q = L, Q̅ = H regardless of clock or data - used for hardware reset initialization. |
| 1D | Data input (Channel 1) | Holds next-state value sampled on rising CLK edge - must meet 4 ns setup time before clock transition. |
| 1CLK | Clock input (Channel 1) | Rising-edge-triggered control signal - defines precise sampling instant for 1D; insensitive to rise time. |
| 1PRE | Asynchronous preset input (Channel 1) | Active-low signal forcing Q = H, Q̅ = L - provides independent set function bypassing clock timing. |
| 1Q / 1Q̅ | Complementary outputs (Channel 1) | Non-inverted and inverted registered outputs - enable direct connection to combinational logic or bus drivers. |
| GND / VCC | Power terminals | Ground reference and 5 V supply pins - require local 0.1 µF ceramic bypass capacitor placed adjacent to pin 7/14. |
| 2Q / 2Q̅ to 2CLR | Second flip-flop I/O set | Functionally identical to Channel 1 - fully independent timing and control, enabling dual-state storage in one IC. |
Key Features
| Feature | Design Value |
|---|---|
| Balanced propagation delays | Minimizes skew between Q and Q̅ outputs (tPLH ≈ tPHL), critical for reliable clock-domain crossing and metastability mitigation. |
| SCR-latchup-resistant process | Prevents destructive latch-up during transient overvoltage or hot-insertion events - essential for ruggedized industrial systems. |
| ±24 mA output drive | Eliminates need for external buffer stages when driving multiple TTL loads or low-power indicators in embedded control panels. |
| TTL-voltage compatible inputs | Accepts standard 74LS/74F output levels directly - avoids level translators in mixed-logic designs. |
| 2 kV HBM ESD rating | Reduces risk of field failure during handling or connector mating in non-ESD-controlled environments. |
Applications
| Industrial PLC Timing Modules | Digital Test Equipment Counters |
|---|---|
|
Use Scenario: Synchronizing sensor sampling intervals and actuator trigger pulses within programmable logic controllers. IC Role / Device Role / Timing Role: Dual-channel D flip-flop latching position encoder edges and generating deterministic strobe signals aligned to system clock. Use Value: Guaranteed 85 MHz operation and –55°C to 125°C range ensure deterministic timing under factory-floor thermal stress and electrical noise. |
Use Scenario: Building scalable frequency dividers and event counters in automated test equipment front-ends. IC Role / Device Role / Timing Role: Cascaded edge-triggered storage element capturing incoming pulse trains and feeding synchronous decode logic. Use Value: ±24 mA drive and TTL-compatible inputs allow direct interface with 74F-series counter ICs without signal conditioning. |
| Aerospace Avionics Sequencers | Legacy System Logic Upgrades |
|
Use Scenario: Implementing fault-tolerant startup sequences and mode-transition latches in flight control subsystems. IC Role / Device Role / Timing Role: Asynchronous PRE/CLR inputs provide hard-wired reset/set capability independent of clock integrity - critical for safety-critical resets. Use Value: MIL-qualified temperature range and SCR-latchup immunity meet DO-254 design assurance requirements for airborne hardware. |
Use Scenario: Replacing obsolete 74LS74 or 74HC74 in aging instrumentation platforms requiring drop-in reliability upgrades. IC Role / Device Role / Timing Role: Pin-compatible dual DFF with enhanced speed, drive strength, and noise margin versus LS/HC variants. Use Value: Identical 14-pin SOIC footprint and logic function enable board-level replacement without layout changes or firmware updates. |
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 |
|---|---|---|---|
| SN74ACT74DR | Same ACT technology, identical electrical specs, but offered in 14-pin SOIC with different marking and tape-and-reel packaging (2500 pcs/reel vs. tube). | Designed for high-volume automated assembly; same functional behavior and timing as CD74ACT74ME4. | Select SN74ACT74DR for SMT production lines requiring reel-fed placement; CD74ACT74ME4 remains optimal for prototyping and low-volume repair. |
| CD74HC74M96 | High-speed CMOS variant with lower drive (±5.2 mA), slower max clock (35 MHz), and narrower voltage range (2–6 V), lacking SCR-latchup resistance. | Suitable only for commercial-temperature, low-noise, low-drive applications - not interchangeable in military/industrial settings. | Choose CD74HC74M96 only if cost sensitivity outweighs speed, drive, and ruggedness requirements; not recommended for direct substitution. |
Compared with SN74ACT74DR and CD74HC74M96, the CD74ACT74ME4 uniquely combines military-grade temperature range, ±24 mA drive, and SCR-latchup immunity - making it the sole option for high-reliability edge-triggered storage where environmental stress and output loading are design constraints.
Availability
CD74ACT74ME4 is available at Aetrix Electronics and suitable for industrial PLC timing modules, aerospace avionics sequencers, and digital test equipment counters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74ACT74ME4 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 specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in high-reliability components for industrial, automotive, and aerospace markets.
The CD74ACT74ME4 belongs to TI's Advanced CMOS Logic (ACT) family, engineered to deliver bipolar-speed performance with CMOS power efficiency and enhanced ruggedness for mission-critical timing and control functions.
FAQ
What is the maximum operating temperature range for CD74ACT74ME4?
The CD74ACT74ME4 is specified for continuous operation from –55°C to 125°C, meeting military-grade environmental requirements. This range is validated per the datasheet's Recommended Operating Conditions table and confirmed by thermal testing using RθJA = 119.9°C/W for the SOIC package. The CD74ACT74ME4 maintains full functionality-including 85 MHz clock rate and ±24 mA output drive-across this entire span without derating.
Does CD74ACT74ME4 support true TTL input voltage levels?
Yes, the CD74ACT74ME4 features TTL-voltage compatible inputs: VIH = 2.0 V (minimum) and VIL = 0.8 V (maximum) at VCC = 4.5–5.5 V. This allows direct connection to legacy 74LS and 74F logic outputs without level-shifting circuitry. Input thresholds are process-stabilized and tested across temperature, ensuring reliable recognition of TTL logic states in mixed-technology systems containing CD74ACT74ME4.
Can CD74ACT74ME4 replace CD74HC74 in existing designs?
CD74ACT74ME4 can replace CD74HC74 only if the design requires higher speed (85 MHz vs. 35 MHz), stronger output drive (±24 mA vs. ±5.2 mA), wider temperature range (–55°C to 125°C vs. –40°C to 85°C), and SCR-latchup immunity. Electrical pinout and logic function are identical, but CD74ACT74ME4 draws higher quiescent current (up to 80 µA vs. 4 µA) and requires stricter bypassing. Verify timing margins and power budget before substitution in CD74HC74-based CD74ACT74ME4 designs.
What is the recommended bypass capacitor for CD74ACT74ME4?
Texas Instruments specifies a 0.1 µF ceramic capacitor placed as close as possible to pins 7 (GND) and 14 (VCC) of the CD74ACT74ME4. This minimizes high-frequency supply impedance and suppresses switching noise generated during output transitions. For improved broadband decoupling, a parallel 1 µF capacitor may be added - but the 0.1 µF unit is mandatory and must have low ESL/ESR. Layout guidelines emphasize shortest possible trace length between capacitor pads and IC power pins to maintain effectiveness in CD74ACT74ME4 applications.
Is CD74ACT74ME4 pin-compatible with other 74xx74 variants?
Yes, CD74ACT74ME4 uses the industry-standard 14-pin SOIC footprint and identical pin configuration (1CLR, 1D, 1CLK, 1PRE, 1Q, 1Q̅, GND, 2Q̅, 2Q, 2PRE, 2CLK, 2D, 2CLR, VCC) defined for all 74xx74 dual D-type flip-flops. It matches pinouts of CD74HC74, SN74ACT74, and 74LS74 - enabling mechanical interchangeability. However, electrical differences (drive strength, speed, voltage range) mean functional compatibility must be verified per application; the CD74ACT74ME4 pinout itself is fully standardized.
CD74ACT74ME4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Set(Preset) and Reset
- Type:
- D-Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 85 MHz
- Max Propagation Delay @ V, Max CL:
- 9.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- 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
CD74ACT74ME4 FAQ
1.How can I place an order for CD74ACT74ME4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74ACT74ME4 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 CD74ACT74ME4 reliable?
The price and inventory of CD74ACT74ME4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74ACT74ME4 is usually 5 days.
3.What payment methods are accepted for CD74ACT74ME4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74ACT74ME4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74ACT74ME4?
CD74ACT74ME4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74ACT74ME4 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 CD74ACT74ME4?
For technical support, including CD74ACT74ME4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74ACT74ME4 requirements.
6.How does Aetrix verify that CD74ACT74ME4 is sourced from the original manufacturer or authorized distributors?
All CD74ACT74ME4 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 CD74ACT74ME4 meets industry standards.
7.What is the process for return or replacement of CD74ACT74ME4?
All CD74ACT74ME4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74ACT74ME4, 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 CD74ACT74ME4 part is unused and in its original packaging.
Return procedure for CD74ACT74ME4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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