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Texas Instruments CD74HCT174MT
- Part No.:
- CD74HCT174MT
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HCT174MT.pdf
- Description:
- IC FF D-TYPE SNGL 6BIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:379
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Product details
Overview
CD74HCT174MT from Texas Instruments is a high-speed CMOS 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, -55°C to +125°C temperature range, and pin compatibility with LS174 logic. Used in industrial PLC I/O modules for parallel data capture.
For engineers reviewing the CD74HCT174MT datasheet, CD74HCT174MT pinout, CD74HCT174MT application, or CD74HCT174MT equivalent, key selection criteria include LSTTL input compatibility (VIL ≤ 0.8 V, VIH ≥ 2.0 V), 60 ns max setup time at 5 V, 50 ns propagation delay (CL = 50 pF), and SOIC-16 package thermal resistance of 73°C/W.
Technical Context
The CD74HCT174MT implements six master-slave D flip-flops sharing one clock (CP) and one asynchronous master reset (MR), enabling synchronized state capture across all six outputs (Q0–Q5). Its silicon-gate CMOS architecture delivers TTL-compatible inputs while maintaining CMOS-level quiescent current (≤160 µA over full temperature range).
It operates strictly within 4.5 V–5.5 V, ensuring direct interface with legacy LSTTL systems without level-shifting. Input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and output drive capability (4 mA sink/source at VOH/VOL) are specified under TTL load conditions, confirming functional equivalence to 74LS174 in mixed-logic designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible CMOS, enabling direct replacement of 74LS174 without redesign. |
| Supply Voltage Range | 4.5 V to 5.5 V - ensures stable operation across standard 5 V ±5% rails in industrial power domains. |
| Max Clock Frequency | 25 MHz at TA = -55°C to +125°C - supports reliable high-speed control sequencing in harsh environments. |
| Propagation Delay (CP→Q) | 60 ns max (CL = 50 pF, VCC = 4.5 V, TA = 125°C) - defines worst-case timing margin for synchronous state updates. |
| Input Thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V - guarantees robust noise immunity and guaranteed recognition of LS-TTL output levels. |
| Output Drive | ±4 mA (TTL loads) - sufficient to drive 10 LSTTL inputs directly, eliminating need for buffer stages. |
| Operating Temperature | -55°C to +125°C - qualified for military, aerospace, and under-hood automotive applications per MIL-PRF-38535. |
Pinout & Package
CD74HCT174MT is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package with 1.27 mm pitch, JEDEC MS-012AC compliant, and moisture sensitivity level (MSL) Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Master Reset | Asynchronous active-low reset; forces all Q outputs low regardless of clock state - critical for system initialization and fault recovery. |
| 2–7, 9–14 (D0–D5) | Data Inputs | Six independent D inputs; each latches on rising edge of CP only if MR is high - enables parallel data acquisition from sensors or buses. |
| 3, 4, 6, 11, 13, 14 (Q0–Q5) | True Outputs | Complementary Q outputs (no Q̅ provided); fanout supports 10 LSTTL loads - suitable for driving downstream logic or LED indicators. |
| 8 (GND) | Ground Reference | Primary ground return path; must be low-impedance connection to minimize switching noise coupling into logic states. |
| 16 (VCC) | Power Supply | Positive supply rail (4.5–5.5 V); decoupling capacitor (0.1 µF ceramic) required within 10 mm for stable high-frequency operation. |
| 15 (CP) | Clock Input | Buffered positive-edge-triggered clock; requires minimum 20 ns pulse width at 125°C - constrains minimum clock period in real-time controllers. |
Key Features
| Feature | Design Value |
|---|---|
| Direct LSTTL Input Compatibility | Eliminates level-shifters when interfacing with 74LS-series logic, reducing BOM count and board space in legacy upgrades. |
| Asynchronous Common Reset | Enables deterministic system-wide state clearing via single control line - essential for safety-critical reset sequences in motor drives. |
| Wide Temperature Range Support | Validated operation from -55°C to +125°C allows deployment in unheated outdoor enclosures or engine-control units without derating. |
| Low Quiescent Current | ICC ≤ 160 µA at 125°C reduces standby power in battery-backed systems and eases thermal management in dense logic arrays. |
| CMOS Input Leakage | II ≤ ±1 µA ensures minimal loading on upstream drivers - preserves signal integrity in high-impedance sensor interface chains. |
Applications
| Industrial PLC I/O Modules | Automotive Engine Control Units |
|---|---|
|
Use Scenario: Capturing status signals from 6 discrete sensors (e.g., pressure switches, limit switches) synchronized to a central controller clock. IC Role / Device Role / Timing Role: Hex D-type flip-flop acting as parallel input register; samples all 6 channels simultaneously on rising CP edge with MR used for cold-start initialization. Use Value: Enables deterministic sampling window aligned to main control loop, avoiding metastability in noisy factory-floor environments. |
Use Scenario: Latching diagnostic flags from multiple subsystems (fuel injection, ignition, O2 sensor) before CAN message transmission. IC Role / Device Role / Timing Role: Synchronous state-hold register; holds transient fault codes until polled by microcontroller during idle cycles. Use Value: Prevents loss of intermittent faults during high-priority real-time tasks, improving diagnostic coverage in ASIL-B systems. |
| Aerospace Avionics Monitoring | Military Radio Transceiver Control |
|
Use Scenario: Storing configuration bits for RF front-end components (filter banks, gain stages) during power-up sequence. IC Role / Device Role / Timing Role: Non-volatile state latch; retains settings across brown-out events using MR-driven safe-state initialization. Use Value: Meets DO-254 design assurance requirements for deterministic hardware reset behavior without external EEPROM dependency. |
Use Scenario: Controlling antenna switching matrix states in HF/VHF software-defined radios operating in extreme ambient temperatures. IC Role / Device Role / Timing Role: Radiation-tolerant data register; provides ESD-hardened (±20 mA IOK) interface between FPGA control logic and analog switch drivers. Use Value: Supports MIL-STD-883 Class B qualification with no derating needed up to 125°C - eliminates thermal throttling in sealed chassis. |
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 | PDIP-16 package; identical electrical specs but higher θJA (67°C/W) and no extended temp rating (0°C to 70°C only). | Limited to commercial-grade applications; unsuitable for under-hood or outdoor deployments requiring -55°C startup. | Select SN74HCT174N only for cost-sensitive, non-ruggedized prototypes where temperature range is not constrained. |
| CD74HC174M96 | HC variant (2V–6V operation); lacks LSTTL input compatibility (VIH min = 1.5 V at 2 V, 3.15 V at 4.5 V) and higher propagation delay (250 ns max at 2 V). | Requires level-shifting when interfacing with 74LS logic; incompatible with existing LS174 drop-in replacements. | Choose CD74HC174M96 only for new designs using pure CMOS signaling or wider supply ranges - not for legacy TTL interoperability. |
Compared with SN74HCT174N and CD74HC174M96, CD74HCT174MT uniquely combines military-grade temperature range, true LSTTL input compatibility, and SOIC packaging - making it the sole option for drop-in LS174 replacement in extended-temperature industrial systems.
Availability
CD74HCT174MT is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive engine control units, aerospace avionics monitoring, and military radio transceiver control requiring stable component supply across extended temperature ranges.
Supply support for CD74HCT174MT 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 IC design.
The CD74HCT174MT belongs to TI's High-Speed CMOS Logic family, engineered specifically for seamless integration into legacy TTL-based systems while delivering CMOS power efficiency and extended temperature resilience.
FAQ
Is CD74HCT174MT pin-compatible with the 74LS174?
Yes, CD74HCT174MT is functionally and pin-compatible with the 74LS174. Its input voltage thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and output drive strength (±4 mA) match LS-TTL specifications, allowing direct substitution without PCB changes. The SOIC-16 footprint aligns with industry-standard 74LS174 PDIP-to-SOIC adapter layouts.
What is the maximum clock frequency supported by CD74HCT174MT at 125°C?
CD74HCT174MT supports a maximum clock frequency of 25 MHz at TA = 125°C (VCC = 4.5 V, CL = 50 pF). This is verified in the datasheet's switching specifications table under "HCT TYPES" for fMAX across the full temperature range, ensuring reliable operation in high-ambient environments like engine bays or industrial enclosures.
Does CD74HCT174MT require external pull-up resistors on its inputs?
No, CD74HCT174MT does not require external pull-up resistors on its inputs. Its CMOS inputs exhibit leakage current ≤ ±1 µA, and internal structure ensures defined logic states with clean TTL-level signals. Pull-ups are unnecessary unless interfacing with open-collector sources or implementing wired-OR logic - which is outside the device's intended use case.
Can CD74HCT174MT operate at 3.3 V supply voltage?
No, CD74HCT174MT is not rated for 3.3 V operation. Its HCT specification mandates 4.5 V–5.5 V supply range to guarantee LSTTL input compatibility and specified timing performance. At 3.3 V, VIH and VIL thresholds become undefined, and propagation delays exceed datasheet limits - risking functional failure in production systems.
What is the thermal resistance (θJA) of the CD74HCT174MT SOIC package?
The CD74HCT174MT in SOIC-16 package has a typical junction-to-ambient thermal resistance (θJA) of 73°C/W, as specified in the Thermal Information section of the datasheet. This value assumes standard JEDEC 2-layer board layout (1 in² copper pad); actual performance may vary with PCB copper area and airflow in the final assembly.
CD74HCT174MT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CD74HCT174MT FAQ
1.How can I place an order for CD74HCT174MT through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT174MT 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 CD74HCT174MT reliable?
The price and inventory of CD74HCT174MT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT174MT is usually 5 days.
3.What payment methods are accepted for CD74HCT174MT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT174MT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT174MT?
CD74HCT174MT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT174MT 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 CD74HCT174MT?
For technical support, including CD74HCT174MT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT174MT requirements.
6.How does Aetrix verify that CD74HCT174MT is sourced from the original manufacturer or authorized distributors?
All CD74HCT174MT 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 CD74HCT174MT meets industry standards.
7.What is the process for return or replacement of CD74HCT174MT?
All CD74HCT174MT units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT174MT, 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 CD74HCT174MT part is unused and in its original packaging.
Return procedure for CD74HCT174MT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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