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Home > Products > Integrated Circuits (ICs) > Logic > Flip Flops

Texas Instruments SN74HC74DT

Name: SN74HC74DT
Brand: Texas Instruments
SKU: SN74HC74DT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74HC74DT

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: 14-SOIC (0.154", 3.90mm Width)

Datasheet:: SN74HC74DT.pdf

Description:: IC FF D-TYPE DUAL 1BIT 14SOIC

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Product details

Overview

SN74HC74DT from Texas Instruments is a dual D-type positive-edge-triggered flip-flop with independent asynchronous preset and clear inputs per channel, operating across 2 V–6 V supply, supporting clock frequencies up to 36 MHz at 6 V, and rated for -40°C to +85°C industrial temperature range - used in digital logic state storage, clock division, and momentary-to-toggle switch conversion.

For engineers reviewing the SN74HC74DT datasheet, SN74HC74DT pinout, SN74HC74DT application, or SN74HC74DT equivalent, this page delivers verified functional identity, SOIC-14 package mapping, timing parameters (t_su, t_pd, f_max), electrical specs (V_OH, V_OL, I_CC), and two validated alternative parts for logic-level-compatible designs.

Technical Context

The SN74HC74DT implements two independent CMOS D-flip-flops, each with asynchronous active-low preset (PRE) and clear (CLR), positive-edge clock triggering, and complementary Q/Q̅ outputs. Its balanced push-pull outputs drive up to 10 LSTTL loads while maintaining rail-to-rail voltage swing.

It operates under standard CMOS input conditions requiring fast edge rates (≤400 ns rise/fall at 6 V), supports fanout scaling via buffered inputs, and uses internal clamp diodes for ESD protection (±2000 V HBM). No internal feedback or metastability mitigation circuitry is integrated.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	High-speed CMOS (74HC), compatible with TTL input thresholds and CMOS output drive
Supply Voltage Range	2 V to 6 V - enables direct interface with 3.3 V and 5 V systems without level shifting
Max Clock Frequency	36 MHz at V_CC = 6 V - supports high-speed synchronous logic in counters and state machines
Propagation Delay (t_pd)	15 ns (CLK→Q, V_CC = 6 V) - determines minimum clock period and setup/hold margin
Output Drive Strength	±5.2 mA at V_CC = 6 V - sufficient to drive multiple CMOS inputs or one LSTTL load
Input Capacitance (C_i)	3 pF typical - minimizes capacitive loading on upstream drivers and preserves signal integrity
Quiescent Supply Current (I_CC)	4 µA typical at V_CC = 6 V - enables low-power operation in battery-backed or standby logic

Pinout & Package

SN74HC74DT is supplied in a 14-pin SOIC (Small Outline Integrated Circuit) package measuring 8.70 mm × 3.90 mm, with gull-wing leads, surface-mount mounting, and standard JEDEC MS-012AC footprint.

Pin/Terminal	Circuit Role	Design Meaning
1, 13	Channel 1 & 2 Clear (CLR)	Asynchronous active-low reset - forces Q = LOW regardless of clock or data state
2, 12	Channel 1 & 2 Data (D)	Primary synchronous input - value latched into Q on next rising clock edge
3, 11	Channel 1 & 2 Clock (CLK)	Positive-edge-triggered control - samples D and updates Q only on rising transition
4, 10	Channel 1 & 2 Preset (PRE)	Asynchronous active-low set - forces Q = HIGH independent of clock or data
5, 9	Channel 1 & 2 True Output (Q)	Complementary registered output - reflects latched D value after CLK↑
6, 8	Channel 1 & 2 Inverted Output (Q̅)	Complementary registered output - always opposite Q state
7	Ground (GND)	Reference return path for all signals and power - must be low-impedance connection
14	Supply (V_CC)	Positive power rail - decoupling capacitor (0.1 µF) required adjacent to pin

Key Features

Feature	Design Value
Dual independent flip-flops	Enables compact implementation of two-bit registers or separate control channels without external gating
Asynchronous PRE/CLR per channel	Allows immediate state initialization or reset without waiting for clock edge - critical for power-on sequencing
Buffered inputs	Reduces sensitivity to noise and improves noise immunity on PRE, CLR, D, and CLK lines
Wide 2 V–6 V supply range	Supports mixed-voltage system integration - e.g., interfacing 3.3 V microcontrollers with 5 V peripherals
Low quiescent current (4 µA)	Minimizes static power draw in always-on logic sections - suitable for energy-constrained embedded nodes

Applications

Toggle Switch Emulation	Frequency Division
Use Scenario: Replacing mechanical toggle switches with momentary pushbuttons in space-constrained front panels or IoT device enclosures. IC Role / Device Role / Timing Role: SN74HC74DT configured as a T-flip-flop (D tied to Q̅) toggles Q on each debounced CLK pulse from the button. Use Value: Eliminates mechanical wear, reduces BOM cost by >40%, and enables PCB-only assembly without switch cutouts.	Use Scenario: Generating half-frequency clock signals for peripheral interfaces or low-power subsystems. IC Role / Device Role / Timing Role: SN74HC74DT Channel 1 divides master clock by 2; cascaded Channel 2 further divides by 2 to yield ÷4 output. Use Value: Provides deterministic, glitch-free division without PLL complexity or external RC networks.
State Storage in Control Logic	Power-On Reset Synchronization
Use Scenario: Capturing and holding status flags (e.g., fault latch, mode select) in industrial PLC I/O modules. IC Role / Device Role / Timing Role: SN74HC74DT stores asynchronous event signals (e.g., overtemperature alert) until polled by MCU via synchronized CLK. Use Value: Prevents missed events during MCU sleep cycles and ensures edge-triggered capture with no software polling overhead.	Use Scenario: Ensuring deterministic initial state of control logic after cold power-up in automotive body controllers. IC Role / Device Role / Timing Role: SN74HC74DT PRE/CLR pins driven by RC-based POR circuit to force Q = LOW at power-on before first CLK. Use Value: Guarantees known startup condition without firmware intervention - meets ISO 16750-2 cold-start requirements.

Toggle Switch Emulation

Frequency Division

Use Scenario: Replacing mechanical toggle switches with momentary pushbuttons in space-constrained front panels or IoT device enclosures.

IC Role / Device Role / Timing Role: SN74HC74DT configured as a T-flip-flop (D tied to Q̅) toggles Q on each debounced CLK pulse from the button.

Use Value: Eliminates mechanical wear, reduces BOM cost by >40%, and enables PCB-only assembly without switch cutouts.

Use Scenario: Generating half-frequency clock signals for peripheral interfaces or low-power subsystems.

IC Role / Device Role / Timing Role: SN74HC74DT Channel 1 divides master clock by 2; cascaded Channel 2 further divides by 2 to yield ÷4 output.

Use Value: Provides deterministic, glitch-free division without PLL complexity or external RC networks.

State Storage in Control Logic

Power-On Reset Synchronization

Use Scenario: Capturing and holding status flags (e.g., fault latch, mode select) in industrial PLC I/O modules.

IC Role / Device Role / Timing Role: SN74HC74DT stores asynchronous event signals (e.g., overtemperature alert) until polled by MCU via synchronized CLK.

Use Value: Prevents missed events during MCU sleep cycles and ensures edge-triggered capture with no software polling overhead.

Use Scenario: Ensuring deterministic initial state of control logic after cold power-up in automotive body controllers.

IC Role / Device Role / Timing Role: SN74HC74DT PRE/CLR pins driven by RC-based POR circuit to force Q = LOW at power-on before first CLK.

Use Value: Guarantees known startup condition without firmware intervention - meets ISO 16750-2 cold-start requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual D-flip-flop applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MC74HC74ADTR2G	Identical logic function and pinout; rated for -55°C to +125°C extended temp range; slightly higher I_CC (20 µA max)	Suitable for automotive under-hood or military environments where extended temperature operation is mandatory	Select when operating ambient exceeds +85°C or when AEC-Q100 qualification is required
74HCT74PW,118	TTL-compatible input thresholds (V_IH = 2.0 V min); same SOIC-14 package; identical t_pd and f_max	Preferred for legacy 5 V systems with TTL-output microcontrollers or FPGAs lacking CMOS-level drive	Select when interfacing with 74LS or older FPGA I/O banks that cannot guarantee 3.5 V high-level input

Compared with SN74HC74DT, MC74HC74ADTR2G offers wider thermal robustness but higher static current, while 74HCT74PW,118 trades CMOS input compatibility for guaranteed TTL-level interoperability - neither is pin-compatible without verifying board-level voltage translation.

Availability

SN74HC74DT is available at Aetrix Electronics and suitable for industrial control panels, consumer appliance timers, automotive body electronics, and test equipment requiring stable component supply across multi-year production cycles.

Supply support for SN74HC74DT 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and logic ICs with over 50 years of leadership in industrial and automotive electronics.

The SN74HC74DT belongs to TI's 74HC logic family, designed specifically for low-power, high-noise-immunity digital control in space- and energy-constrained embedded systems.

FAQ

What is the maximum clock frequency supported by SN74HC74DT?

The SN74HC74DT supports a maximum clock frequency of 36 MHz when operated at V_CC = 6 V and T_A = 25°C. At 5 V, the guaranteed maximum is 25 MHz, and at 2 V it drops to 5 MHz. These values are specified in the switching characteristics table and assume proper load capacitance (≤50 pF) and clean power supply decoupling.

Does SN74HC74DT have built-in Schmitt-trigger inputs?

No, SN74HC74DT does not include Schmitt-trigger inputs. It uses standard CMOS inputs requiring fast edge rates (≤400 ns at 6 V) to avoid shoot-through current and oscillation. For slow or noisy signals, an external Schmitt-trigger buffer such as SN74HC14 must be used ahead of the CLK, PRE, or CLR inputs.

Can unused inputs on SN74HC74DT be left floating?

No, unused inputs on SN74HC74DT must never be left floating. Each unconnected input can drift to an indeterminate voltage, causing excessive current draw, logic instability, or increased EMI. Unused D, PRE, CLR, or CLK pins must be tied to V_CC or GND via 10-kΩ resistors or direct connection depending on required default state.

What is the purpose of the Q̅ (complement) output on SN74HC74DT?

The Q̅ output on SN74HC74DT provides the logical inverse of the Q output, enabling direct implementation of toggle (T) flip-flop behavior (by connecting Q̅ to D), differential signaling, or complementary control of paired devices like H-bridge drivers - eliminating need for external inverters in many configurations.

Is SN74HC74DT RoHS compliant and lead-free?

Yes, SN74HC74DT is RoHS compliant and lead-free per TI's official packaging documentation. It uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), allowing unlimited floor life at ≤30°C/60% RH without dry-pack requirements.

SN74HC74DT Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74HC

Package/Case:: 14-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

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:: 60 MHz

Max Propagation Delay @ V, Max CL:: 30ns @ 6V, 50pF

Trigger Type:: Positive Edge

Current - Output High, Low:: 5.2mA, 5.2mA

Voltage - Supply:: 2V ~ 6V

Current - Quiescent (Iq):: 4 µA

Input Capacitance:: 3 pF

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SOIC

SN74HC74DT FAQ

1.How can I place an order for SN74HC74DT through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74HC74DT 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 SN74HC74DT reliable?

The price and inventory of SN74HC74DT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC74DT is usually 5 days.

3.What payment methods are accepted for SN74HC74DT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC74DT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74HC74DT?

SN74HC74DT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74HC74DT 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 SN74HC74DT?

For technical support, including SN74HC74DT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC74DT requirements.

6.How does Aetrix verify that SN74HC74DT is sourced from the original manufacturer or authorized distributors?

All SN74HC74DT 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 SN74HC74DT meets industry standards.

7.What is the process for return or replacement of SN74HC74DT?

All SN74HC74DT units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC74DT, 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 SN74HC74DT part is unused and in its original packaging.

Return procedure for SN74HC74DT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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