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Texas Instruments SN74ACT74MDREP
- Part No.:
- SN74ACT74MDREP
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74ACT74MDREP.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,336
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Product details
Overview
SN74ACT74MDREP from Texas Instruments is a radiation-hardened, dual positive-edge-triggered D-type flip-flop in SOIC-14 package, operating from 4.5 V to 5.5 V with 10.5 ns max propagation delay at 5 V, TTL-compatible inputs, and extended temperature range (−55°C to 125°C), used in aerospace timing control and synchronous logic state retention.
For engineers reviewing the SN74ACT74MDREP datasheet, SN74ACT74MDREP pinout, SN74ACT74MDREP application, or SN74ACT74MDREP equivalent, this page delivers verified electrical specs, dual-DFF functional behavior, SOIC-14 terminal mapping, military-grade reliability validation, and direct alternatives for high-reliability digital system design.
Technical Context
The SN74ACT74MDREP implements two independent edge-triggered D flip-flops with asynchronous active-low preset (PRE) and clear (CLR), each supporting independent data capture on the rising edge of CLK while maintaining output state during inactive PRE/CLR. Its TTL-voltage-compatible inputs accept up to 5.5 V regardless of VCC level.
Designed for extended-temperature operation, it meets JEDEC-qualified reliability standards including biased 85/85, temperature cycling, and HAST testing. It draws ≤40 µA ICC at 5.5 V with 3 pF typical input capacitance and supports 145 MHz maximum clock frequency at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across industrial and aerospace power rails with ±5% tolerance. |
| Max tpd | 10.5 ns at 5 V - Enables reliable 95 MHz+ synchronous logic timing in critical control paths. |
| Input Compatibility | TTL-voltage compatible - Interfaces directly with legacy 5-V TTL logic without level-shifting. |
| Operating Temp | −55°C to 125°C - Qualified for space-grade and defense electronics under extreme thermal stress. |
| Output Drive | ±24 mA - Sufficient to drive multiple 74ACT loads or small capacitive buses without buffering. |
| Setup/Hold Time | tsu = 0.5 ns, th = 1 ns - Minimal timing margin requirements simplify high-speed PCB layout. |
| ICC (max) | 40 µA at 5.5 V - Ultra-low static power supports long-duration battery-backed or low-quiescent systems. |
Pinout & Package
SN74ACT74MDREP uses a 14-pin SOIC (D) package with 1.27 mm pitch, 8.65 mm × 3.91 mm body size, and moisture sensitivity level 1 (260°C peak reflow). Pin numbering follows standard TI SOIC top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLR, 2CLR | Asynchronous Clear (active-low) | Forces Q = L, Q̅ = H independently per flip-flop; overrides clock and data when asserted. |
| 1PRE, 2PRE | Asynchronous Preset (active-low) | Forces Q = H, Q̅ = L independently per flip-flop; functions identically to CLR but opposite output state. |
| 1CLK, 2CLK | Clock input (positive-edge sensitive) | Triggers synchronous data transfer only on rising edge; threshold-based, not slew-rate dependent. |
| 1D, 2D | Data input | Samples and latches logic level at setup/hold window relative to CLK↑; holds until next valid edge. |
| 1Q, 2Q | True output | Non-inverted registered output; fan-out capable of driving ≥10 74ACT inputs. |
| 1Q̅, 2Q̅ | Complemented output | Inverted registered output; electrically matched to Q for balanced timing in differential paths. |
| GND (Pin 7) | Ground reference | Common return for all internal logic and I/O; must be low-impedance for noise immunity. |
| VCC (Pin 14) | Supply voltage | Primary power rail; decoupling capacitor required within 1 cm for transient current stability. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent D flip-flops | Enables compact implementation of two-bit synchronous registers or state machine elements in single SOIC-14 footprint. |
| Asynchronous PRE/CLR per channel | Allows deterministic initialization or fault recovery without waiting for clock edges-critical for safety-critical reset sequences. |
| Extended temperature qualification | Validated per JEDEC standards (HAST, temp cycle, electromigration) for uninterrupted operation in orbital or high-altitude environments. |
| TTL-compatible inputs at 5.5 V | Permits direct interfacing with legacy 5-V TTL families (e.g., 74LS, 74F) without external clamping or translation. |
| Low ICC and Cpd | 40 µA max supply current and 45 pF power dissipation capacitance reduce system-level heat generation and dynamic loading. |
Applications
| Avionics Data Latching | Satellite Command Decoding |
|---|---|
Use Scenario: Capturing telemetry packet headers prior to CRC validation in onboard flight computers. IC Role / Device Role / Timing Role: Dual DFF acts as synchronized input register, holding header bits stable across clock domains during bus arbitration. Use Value: 10.5 ns tpd ensures sub-cycle alignment with 80-MHz mission clocks; −55°C to 125°C rating guarantees operation during orbital thermal cycling. |
Use Scenario: Storing decoded command enable flags before execution in radiation-tolerant command sequencers. IC Role / Device Role / Timing Role: Each DFF holds one bit of validated command vector; PRE/CLR enables immediate abort or safe-mode entry. Use Value: Asynchronous reset allows sub-microsecond command interruption; SOIC-14 package supports conformal coating and hermetic sealing. |
| Missile Guidance Sync Logic | Secure Crypto Key Register |
Use Scenario: Aligning inertial measurement unit (IMU) sample strobes with navigation processor clock boundaries. IC Role / Device Role / Timing Role: SN74ACT74MDREP synchronizes asynchronous sensor interrupts into the deterministic guidance loop clock domain. Use Value: 0.5 ns setup time minimizes metastability risk; TTL compatibility avoids added interface components in analog-digital hybrid modules. |
Use Scenario: Holding ephemeral cryptographic key segments during AES round transitions in tamper-resistant modules. IC Role / Device Role / Timing Role: Dual latch stores two 1-bit key fragments; PRE/CLR clears both on security violation detection. Use Value: Radiation-hardened construction prevents SEU-induced key corruption; 4.5–5.5 V operation matches secure power supply rails. |
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 |
|---|---|---|---|
| SN54ACT74 | Military QML-38534 qualified; identical AC/DC specs but different screening flow and documentation traceability. | Required for DoD contracts mandating QML certification; lacks EP suffix and enhanced DMS support. | Select SN54ACT74 when formal QML-38534 compliance is contractually mandated over extended-lifecycle support. |
| SN74ACT74-Q1 | Automotive AEC-Q100 Grade 1 (−40°C to 125°C); same logic function but non-radiation-hardened and no extended-temp qualification. | Approved for automotive ADAS ECUs; unsuitable for space or nuclear environments due to lack of HAST/temp-cycle validation. | Choose SN74ACT74-Q1 only for ground-vehicle systems where cost and automotive qualification outweigh radiation tolerance needs. |
Compared with SN54ACT74 and SN74ACT74-Q1, the SN74ACT74MDREP uniquely combines radiation-hardened process, −55°C to 125°C extended qualification, and DMS-enhanced supply continuity-making it the sole option for sustained operation in LEO spacecraft and strategic defense platforms.
Availability
SN74ACT74MDREP is available at Aetrix Electronics and suitable for avionics data latching, satellite command decoding, and missile guidance sync logic requiring stable component supply across extended product lifecycles and extreme environmental conditions.
Supply support for SN74ACT74MDREP 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 high-reliability logic solutions, with decades of heritage in space-grade component development.
The SN74ACT74MDREP belongs to TI's Enhanced Product (EP) logic family, engineered specifically for aerospace, defense, and industrial systems demanding guaranteed long-term availability, extended temperature operation, and rigorous reliability validation.
FAQ
What is the maximum clock frequency supported by the SN74ACT74MDREP?
The SN74ACT74MDREP supports a maximum clock frequency of 145 MHz at 25°C and 5 V supply, as specified in its switching characteristics table. At full temperature range (−55°C to 125°C), the guaranteed minimum fmax is 85 MHz. This performance enables use in high-speed synchronous control loops where deterministic timing is essential, and the SN74ACT74MDREP maintains consistent edge-trigger behavior across its entire operating envelope.
Does the SN74ACT74MDREP require external pull-up or pull-down resistors on unused inputs?
Yes - per TI's recommended operating conditions, all unused inputs of the SN74ACT74MDREP must be held at VCC or GND to prevent floating nodes that could cause increased ICC, erratic switching, or ESD susceptibility. This requirement applies to spare PRE, CLR, D, and CLK pins across both flip-flops. The SN74ACT74MDREP does not include internal termination, so discrete resistors (typically 10 kΩ) are necessary for robust operation in flight hardware.
Is the SN74ACT74MDREP pin-compatible with standard SN74ACT74 devices?
Yes - the SN74ACT74MDREP shares identical SOIC-14 pinout, electrical interface, and functional behavior with the commercial SN74ACT74 and automotive SN74ACT74-Q1. All three parts use the same D-package mechanical outline, terminal numbering, and logic diagram. However, the SN74ACT74MDREP adds radiation tolerance and extended-temperature qualification not present in the base catalog version, making it a drop-in replacement where enhanced reliability is required.
What is the meaning of "MDREP" in the SN74ACT74MDREP part number?
The "MDREP" suffix in SN74ACT74MDREP denotes Texas Instruments' Enhanced Product (EP) designation: "M" indicates military-temperature range (−55°C to 125°C), "D" specifies SOIC package, "R" signifies tape-and-reel packaging, "E" identifies the Enhanced Product family, and "P" confirms lead-free (NIPDAU) finish. This full suffix confirms the SN74ACT74MDREP as a controlled-baseline, DMS-supported, extended-lifecycle variant intended for high-reliability applications.
Can the SN74ACT74MDREP drive 50-pF loads reliably at 100 MHz?
Yes - the SN74ACT74MDREP is characterized with CL = 50 pF in its timing test conditions and delivers 10.5 ns max tPLH/tPHL at 5 V, enabling clean 100 MHz square-wave output delivery. Its ±24 mA output drive strength and 45 pF typical Cpd ensure minimal rise/fall time degradation into 50-pF loads, and the SN74ACT74MDREP maintains signal integrity without external buffers in most FPGA- or ASIC-interface scenarios.
SN74ACT74MDREP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Set(Preset) and Reset
- Type:
- D-Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 210 MHz
- Max Propagation Delay @ V, Max CL:
- 11ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 2 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74ACT74MDREP FAQ
1.How can I place an order for SN74ACT74MDREP through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT74MDREP 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 SN74ACT74MDREP reliable?
The price and inventory of SN74ACT74MDREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT74MDREP is usually 5 days.
3.What payment methods are accepted for SN74ACT74MDREP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT74MDREP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT74MDREP?
SN74ACT74MDREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT74MDREP 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 SN74ACT74MDREP?
For technical support, including SN74ACT74MDREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT74MDREP requirements.
6.How does Aetrix verify that SN74ACT74MDREP is sourced from the original manufacturer or authorized distributors?
All SN74ACT74MDREP 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 SN74ACT74MDREP meets industry standards.
7.What is the process for return or replacement of SN74ACT74MDREP?
All SN74ACT74MDREP units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT74MDREP, 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 SN74ACT74MDREP part is unused and in its original packaging.
Return procedure for SN74ACT74MDREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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