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Texas Instruments SN74AHCT74PW
- Part No.:
- SN74AHCT74PW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT74PW.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,346
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Product details
Overview
SN74AHCT74PW from Texas Instruments is a dual positive-edge-triggered D-type flip-flop with independent asynchronous preset (PRE) and clear (CLR) inputs, operating at 4.5 V–5.5 V supply, delivering ±8-mA output drive at 5 V, TTL-compatible inputs, and 10-µA maximum ICC. It functions as a synchronous storage element in digital control logic, clock division, and signal conditioning circuits.
For engineers reviewing the SN74AHCT74PW datasheet, SN74AHCT74PW pinout, SN74AHCT74PW application, or SN74AHCT74PW equivalent, this page delivers verified functional behavior, TSSOP-14 package-specific timing (tPLH/tPHL ≤ 9 ns @ CL = 15 pF), noise-immune operation in noisy environments, and precise dual-flip-flop configuration for toggle, hold, and divide-by-two use cases.
Technical Context
The SN74AHCT74PW implements two independent edge-triggered D flip-flops sharing no internal coupling - each with dedicated PRE, CLR, CLK, D, Q, and Q̅ terminals. Clock triggering occurs at a fixed voltage threshold (not edge-rate dependent), enabling robust operation with slow-rising or noisy clocks.
Its TTL-compatible inputs accept 0.8 V/2.0 V VIH/VIL thresholds and tolerate up to 5.5 V input voltage; outputs feature balanced CMOS push-pull structure with ±8-mA drive capability and clamping diodes per JESD17 latch-up specification (>250 mA).
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 mixed-voltage logic systems |
| Output Drive | ±8 mA at 5 V - sufficient to directly drive multiple 74-series TTL inputs or small capacitive loads |
| Input Compatibility | TTL-voltage compatible - accepts standard TTL logic levels without level-shifting circuitry |
| Max ICC | 10 µA - enables low-static-power operation in battery-backed or always-on control subsystems |
| Propagation Delay | tPLH/tPHL ≤ 9 ns (CL = 15 pF, TA = –40°C to 85°C) - supports reliable 100-MHz clock division and synchronization |
| Latch-up Immunity | >250 mA per JESD17 - guarantees robustness against transient current faults in industrial environments |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control applications |
Pinout & Package
PW package is a 14-pin Thin Shrink Small Outline Package (TSSOP) with 0.65-mm pitch, 5.0 mm × 6.4 mm body size, and exposed thermal pad (not electrically connected). Pin numbering follows JEDEC MS-012 standard, top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLR, 2CLR | Asynchronous Clear Input | Active-low reset - forces Q = L / Q̅ = H independently of clock or data; overrides all other inputs |
| 1PRE, 2PRE | Asynchronous Preset Input | Active-low set - forces Q = H / Q̅ = L independently of clock or data; overrides all other inputs |
| 1CLK, 2CLK | Clock Input | Positive-edge-triggered sampling point - transfers D-state to Q on rising edge; voltage-threshold triggered, not slew-rate dependent |
| 1D, 2D | Data Input | Synchronous input - value latched into Q only when PRE/CLR are high and setup/hold times met |
| 1Q, 2Q | True Output | Non-inverted registered output - reflects latched D state after propagation delay |
| 1Q̅, 2Q̅ | Complement Output | Inverted registered output - provides complementary logic state for feedback or differential signaling |
| VCC (Pin 14) | Power Supply | +5 V nominal supply - powers both flip-flop sections; requires local 0.1-µF bypass capacitor |
| GND (Pin 7) | Ground Reference | Return path for all I/O and supply currents - must be low-impedance and thermally coupled to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent flip-flops | Enables compact implementation of two synchronized storage elements in one 5-mm × 6.4-mm footprint |
| Asynchronous preset/clear | Allows immediate initialization or forced reset without waiting for next clock edge - critical for system startup and fault recovery |
| TTL-compatible inputs | Eliminates need for external level shifters when interfacing with legacy 74LS or microcontroller GPIOs |
| Low power consumption | 10-µA max ICC enables use in energy-sensitive applications such as remote sensors and standby controllers |
| Robust noise immunity | Clamping diodes and 2.0-V VIH threshold suppress ESD transients and reduce susceptibility to rail-coupled noise |
Applications
| Toggle Switch Emulation | Controller Reset Hold |
|---|---|
Use Scenario: Replacing mechanical toggle switches with momentary pushbuttons in space-constrained front panels or embedded UIs. IC Role / Device Role / Timing Role: SN74AHCT74PW acts as a synchronous toggle latch - D input tied to Q̅, CLK driven by debounced button pulse, generating alternating Q states per press. Use Value: Reduces BOM cost and mechanical wear while maintaining deterministic edge-triggered behavior immune to contact bounce. | Use Scenario: Maintaining stable enable/disable signals during microcontroller reset sequences where peripherals must remain active or held in known state. IC Role / Device Role / Timing Role: SN74AHCT74PW stores control bits (e.g., enable flags) using asynchronous PRE/CLR to force initial state, then clocks updated values only after reset deassertion. Use Value: Prevents glitch-induced peripheral misbehavior by decoupling control logic timing from reset assertion duration. |
| Noise-Tolerant Signal Conditioning | Divide-by-Two Clock Generation |
Use Scenario: Interfacing slow-rising or electrically noisy sensor signals (e.g., reed switch, optocoupler outputs) to clean digital logic domains. IC Role / Device Role / Timing Role: SN74AHCT74PW samples conditioned inputs on clean clock edges; its voltage-threshold clock trigger rejects slow transitions and EMI-induced jitter. Use Value: Achieves reliable registration without external Schmitt triggers - reducing component count and board area. | Use Scenario: Generating half-frequency clock domains from master oscillators in FPGA I/O banks, MCU peripherals, or serial interface timing blocks. IC Role / Device Role / Timing Role: SN74AHCT74PW configured as toggle flip-flop (D→Q̅ feedback) divides input clock by exactly two with minimal skew and guaranteed duty cycle stability. Use Value: Provides deterministic 50% duty-cycle output up to 100 MHz (fmax), eliminating need for PLL-based dividers in non-critical timing paths. |
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 |
|---|---|---|---|
| SN74LVC74APW | Lower VCC range (1.65–3.6 V), 3.3-V logic compatible, higher speed (tPD ≈ 4.5 ns), but no TTL input compatibility | Required in 3.3-V-only systems; unsuitable for 5-V TTL interfacing or mixed-voltage designs | Select SN74LVC74APW only when operating strictly within 1.65–3.6 V and interfacing exclusively with LVC/LV families |
| 74HC74PW | Same pinout, 2–6 V supply, higher ICC (≤ 4 µA typical), lower output drive (±4 mA), no TTL input compatibility | Acceptable in 5-V systems without TTL sources; lacks noise margin for direct 74LS interface | Choose 74HC74PW if cost sensitivity outweighs need for TTL compatibility and ±8-mA drive |
Compared with SN74LVC74APW and 74HC74PW, the SN74AHCT74PW uniquely combines 5-V operation, TTL input compatibility, and ±8-mA drive - making it the only option among the three for bridging legacy TTL logic to modern 5-V digital control systems without level translation.
Availability
SN74AHCT74PW is available at Aetrix Electronics and suitable for industrial control panels, automotive body electronics, medical device timing modules, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHCT74PW 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 designing analog, embedded processing, and logic ICs for industrial, automotive, and communications markets.
The SN74AHCT74PW belongs to TI's AHCT logic family - engineered for 5-V TTL-to-CMOS interfacing with high noise immunity, low power, and guaranteed operation across –40°C to +125°C.
FAQ
What is the maximum clock frequency supported by the SN74AHCT74PW?
The SN74AHCT74PW supports a maximum clock frequency of 100 MHz under recommended conditions (VCC = 5 V, CL = 15 pF, TA = –40°C to +85°C), corresponding to a minimum clock period of 10 ns. This is derived from tPLH/tPHL ≤ 9 ns and setup/hold time requirements totaling ≤ 5 ns. At CL = 50 pF, fmax reduces to 80 MHz due to increased load-dependent propagation delay.
Does the SN74AHCT74PW require external pull-up or pull-down resistors on unused inputs?
Yes - all unused inputs of the SN74AHCT74PW must be terminated to either VCC or GND to prevent floating states that cause excessive ICC, logic instability, or ESD susceptibility. TI recommends 10-kΩ pull-up or pull-down resistors for inputs that may transition between active and inactive states; direct connection is acceptable for permanently static inputs.
Can the SN74AHCT74PW operate reliably with a 3.3-V supply voltage?
No - the SN74AHCT74PW is specified only for 4.5 V to 5.5 V operation per its Recommended Operating Conditions. At 3.3 V, VIH/VIL thresholds become undefined, output drive drops below specification, and timing parameters (e.g., tPLH) degrade beyond datasheet limits. For 3.3-V systems, use SN74LVC74APW instead.
What is the thermal resistance (RθJA) of the SN74AHCT74PW package?
The SN74AHCT74PW (TSSOP-14) has a junction-to-ambient thermal resistance (RθJA) of 147.7°C/W, measured per JEDEC JESD51 standards with 1-inch² 2-oz copper pad. This value assumes standard PCB layout with thermal vias to inner ground planes; actual thermal performance improves with enhanced copper area and airflow.
How does the SN74AHCT74PW handle input signals slower than the specified Δt/Δv limit?
If input transition rates fall below the specified 20 ns/V limit, the SN74AHCT74PW may exhibit increased ICC, output oscillation, or metastability due to prolonged input dwell in the logic threshold region. TI explicitly warns against slow or floating inputs and mandates use of Schmitt-trigger buffers or RC networks to ensure monotonic, fast transitions - especially on CLK and D lines.
SN74AHCT74PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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:
- 140 MHz
- Max Propagation Delay @ V, Max CL:
- 11.4ns @ 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:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
SN74AHCT74PW FAQ
1.How can I place an order for SN74AHCT74PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT74PW 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 SN74AHCT74PW reliable?
The price and inventory of SN74AHCT74PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT74PW is usually 5 days.
3.What payment methods are accepted for SN74AHCT74PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT74PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHCT74PW?
SN74AHCT74PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT74PW 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 SN74AHCT74PW?
For technical support, including SN74AHCT74PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT74PW requirements.
6.How does Aetrix verify that SN74AHCT74PW is sourced from the original manufacturer or authorized distributors?
All SN74AHCT74PW 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 SN74AHCT74PW meets industry standards.
7.What is the process for return or replacement of SN74AHCT74PW?
All SN74AHCT74PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT74PW, 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 SN74AHCT74PW part is unused and in its original packaging.
Return procedure for SN74AHCT74PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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