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Texas Instruments SN74AHCT74MDREP
- Part No.:
- SN74AHCT74MDREP
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AHCT74MDREP.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,501
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Product details
Overview
SN74AHCT74MDREP from Texas Instruments is a dual positive-edge-triggered D-type flip-flop with independent asynchronous clear (CLR) and preset (PRE) inputs, operating over –55°C to 125°C, supporting 4.5–5.5 V supply, TTL-compatible inputs, and delivering 8 mA output drive at 5 V. It serves as a synchronous storage element in radiation-tolerant industrial control and avionics timing circuits.
For engineers reviewing the SN74AHCT74MDREP datasheet, SN74AHCT74MDREP pinout, SN74AHCT74MDREP application, or SN74AHCT74MDREP equivalent, this page delivers verified electrical specs, SOIC-14 package mapping, functional timing behavior, and qualified military-grade alternatives for extended-temperature embedded systems design.
Technical Context
The SN74AHCT74MDREP implements two independent edge-triggered D flip-flops using TI's EPIC™ (Enhanced-Performance Implanted CMOS) process, enabling robust latch-up immunity (>250 mA per JESD17) and ESD protection (>2 kV HBM). Each flip-flop features asynchronous active-low CLR and PRE, with data propagation on the rising clock edge only when both controls are high.
Its input structure accepts TTL-voltage levels (VIH ≥ 2 V, VIL ≤ 0.8 V), while output VOH/VOL are specified at ±8 mA loads (VOH ≥ 3.94 V, VOL ≤ 0.44 V at VCC = 4.5 V). Maximum operating frequency reaches 100 MHz at CL = 15 pF and 80 MHz at CL = 50 pF under recommended conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with 5 V logic rails and margin against brownout in harsh environments |
| Operating Temperature | –55°C to 125°C - qualified for space-constrained, high-reliability aerospace and defense platforms |
| Output Drive | ±8 mA - sufficient to directly drive multiple 74-series inputs or small capacitive loads without buffering |
| Propagation Delay | 5.8–7.8 ns (CLK→Q, CL = 15 pF) - enables sub-10 ns timing-critical state transitions in real-time controllers |
| Setup/Hold Time | tsu = 5 ns, th = 0 ns - simplifies timing closure with minimal data path margin required before clock edge |
| Input Compatibility | TTL-level (VIH ≥ 2 V, VIL ≤ 0.8 V) - allows direct interfacing with legacy 74LS/74F outputs without level-shifting |
| Power Dissipation | Cpd = 32 pF - predicts dynamic power consumption for thermal modeling in sealed enclosures |
Pinout & Package
SN74AHCT74MDREP is housed in a 14-pin SOIC (D) package with standard 1.27 mm pitch, JEDEC MO-002AC compliant, and RoHS-compliant NiPdAu lead finish. Thermal resistance θJA = 86°C/W supports operation up to 125°C ambient with moderate PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 4, 5, 6, 10, 11, 12, 13 | Logic I/O (1CLR, 1D, 1CLK, 1PRE, 1Q, 1Q̅, 2CLR, 2D, 2CLK, 2PRE, 2Q, 2Q̅) | Asynchronous control and data paths for two independent DFFs; all inputs tolerate TTL voltage thresholds |
| 7 | GND | Ground reference for all internal logic and output stages; must be low-impedance for noise immunity |
| 14 | VCC | Primary power supply; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin for stable switching |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent D-type flip-flops | Enables compact implementation of two-bit registers or synchronized dual-channel control signals in one IC |
| Asynchronous active-low PRE/CLR | Allows immediate state initialization or reset independent of clock, critical for fail-safe system startup |
| EPIC™ process technology | Delivers latch-up immunity >250 mA and ESD >2 kV HBM, meeting MIL-STD-883 requirements for ruggedized systems |
| TTL-input compatible | Eliminates need for external level shifters when interfacing with legacy 74LS or microcontroller GPIOs |
| Controlled baseline manufacturing | Single assembly/test site and single fabrication site ensure consistent parametric performance across production lots |
Applications
| Avionics Data Synchronization | Industrial PLC Input Latching |
|---|---|
Use Scenario: Capturing sensor data from analog-to-digital converters in flight control computers where deterministic sampling timing and fault recovery are mandatory. IC Role / Device Role / Timing Role: Dual DFF acts as synchronized sample-and-hold register, with PRE/CLR used for hardware-initiated state reset during mode transitions. Use Value: Sub-10 ns propagation delay and guaranteed operation at 125°C enable reliable data capture at 10+ MHz sampling rates in sealed avionics bays. | Use Scenario: Isolating and synchronizing discrete input signals (e.g., limit switches, emergency stops) into programmable logic controller scan cycles. IC Role / Device Role / Timing Role: Provides metastability-hardened input registration, converting asynchronous field signals into synchronous logic domain with glitch-free edge detection. Use Value: Asynchronous clear/preset allows immediate override of latched states during safety shutdown sequences without waiting for next clock cycle. |
| Radiation-Tolerant Telemetry Buffer | Secure Boot State Machine |
Use Scenario: Storing telemetry packet headers in satellite subsystems exposed to total ionizing dose (TID) and single-event effects. IC Role / Device Role / Timing Role: Stores configuration bits and packet sequence numbers; PRE/CLR used to force known-good state after radiation-induced upset. Use Value: Extended temperature qualification (–55°C to 125°C) and latch-up immunity >250 mA support operation in unheated orbital environments. | Use Scenario: Implementing tamper-resistant boot sequence control in secure microcontrollers requiring hardware-enforced state progression. IC Role / Device Role / Timing Role: Forms part of a hardened finite-state machine that advances only on validated clock edges, with PRE/CLR enforcing irreversible failure states. Use Value: TTL-compatible inputs allow direct connection to secure monitor outputs; zero hold time simplifies timing analysis for certification (e.g., DO-254). |
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 |
|---|---|---|---|
| SN54AHCT74 | Military QML-38534 certified; identical electrical specs but with full MIL-PRF-38534 screening and extended reliability testing | Required for DoD-specified hardware; supports higher confidence in long-term mission-critical deployments | Select SN54AHCT74 when formal military qualification and traceable lot documentation are mandated |
| SN74AHCT74 | Commercial temperature range (–40°C to 85°C); same pinout, function, and DC specs but not qualified for extended temperature or enhanced reliability | Suitable for non-mission-critical industrial or test equipment where cost and availability outweigh extreme environmental needs | Choose SN74AHCT74 for cost-sensitive designs operating within commercial temperature limits |
Compared with SN74AHCT74MDREP, SN54AHCT74 adds formal military qualification and screening for space/defense use, while SN74AHCT74 reduces cost and lead time at the expense of extended temperature and reliability assurance-making each optimal for distinct program risk profiles.
Availability
SN74AHCT74MDREP is available at Aetrix Electronics and suitable for avionics data synchronization, industrial PLC input latching, and radiation-tolerant telemetry buffer applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN74AHCT74MDREP 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 aerospace, defense, and industrial markets.
The SN74AHCT74MDREP belongs to TI's enhanced-product (EP) logic family, engineered specifically for extended-temperature, high-reliability applications where standard commercial parts cannot meet environmental or longevity requirements.
FAQ
What is the maximum clock frequency supported by SN74AHCT74MDREP?
The SN74AHCT74MDREP supports a maximum clock frequency of 100 MHz when driving a 15 pF load and 80 MHz at 50 pF, as measured under recommended operating conditions (VCC = 5 V ± 0.5 V, TA = –55°C to 125°C). These values reflect guaranteed minimum performance across the full temperature range, not typical-only specifications.
Does SN74AHCT74MDREP require external pull-up resistors on PRE and CLR inputs?
No, SN74AHCT74MDREP does not require external pull-ups on PRE or CLR. The device specifies VIH ≥ 2 V and VIL ≤ 0.8 V, and all unused inputs must be actively driven to VCC or GND per TI application report SCBA004. Floating PRE/CLR pins may cause undefined output states or increased current draw.
Is SN74AHCT74MDREP pin-compatible with standard SN74AHCT74?
Yes, SN74AHCT74MDREP is pin-compatible with SN74AHCT74 and SN54AHCT74 in the same SOIC-14 (D) package. All three share identical pin assignments, logic function, and DC electrical characteristics-only temperature range, reliability screening, and qualification pedigree differ.
What is the meaning of "MDREP" in SN74AHCT74MDREP?
The "MDREP" suffix denotes Texas Instruments' enhanced-product (EP) variant in SOIC (D) package, tape-and-reel (R) packaging, and extended temperature (–55°C to 125°C) qualification. "M" indicates military/aerospace grade, "D" is SOIC, "R" is tape-and-reel, and "EP" confirms enhanced-product status per TI's controlled baseline program.
Can SN74AHCT74MDREP operate reliably at 3.3 V supply?
No, SN74AHCT74MDREP is not specified for 3.3 V operation. Its recommended supply range is strictly 4.5 V to 5.5 V. At 3.3 V, VIH/VIL thresholds become unmet, output drive falls below specification, and timing parameters are no longer guaranteed-TI does not characterize or warrant operation outside this range.
SN74AHCT74MDREP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- 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:
- 140 MHz
- Max Propagation Delay @ V, Max CL:
- 8.8ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 2 µA
- Input Capacitance:
- 2 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74AHCT74MDREP FAQ
1.How can I place an order for SN74AHCT74MDREP through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT74MDREP 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 SN74AHCT74MDREP reliable?
The price and inventory of SN74AHCT74MDREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT74MDREP is usually 5 days.
3.What payment methods are accepted for SN74AHCT74MDREP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT74MDREP transactions.
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4.How is shipping managed for SN74AHCT74MDREP?
SN74AHCT74MDREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT74MDREP 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 SN74AHCT74MDREP?
For technical support, including SN74AHCT74MDREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT74MDREP requirements.
6.How does Aetrix verify that SN74AHCT74MDREP is sourced from the original manufacturer or authorized distributors?
All SN74AHCT74MDREP 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 SN74AHCT74MDREP meets industry standards.
7.What is the process for return or replacement of SN74AHCT74MDREP?
All SN74AHCT74MDREP units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT74MDREP, 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 SN74AHCT74MDREP part is unused and in its original packaging.
Return procedure for SN74AHCT74MDREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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