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Texas Instruments SN74AHC74PWG4
- Part No.:
- SN74AHC74PWG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC74PWG4.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,323
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Product details
Overview
SN74AHC74PWG4 from Texas Instruments is a dual positive-edge-triggered D-type flip-flop with independent asynchronous clear (CLR) and preset (PRE) inputs, operating across 2 V to 5.5 V supply range, delivering 110 MHz maximum clock frequency at 5 V, 14 ns propagation delay (tPLH/tPHL), and ±8 mA output drive capability. It is used in digital logic control, clock division, and signal debouncing circuits.
For engineers reviewing the SN74AHC74PWG4 datasheet, SN74AHC74PWG4 pinout, SN74AHC74PWG4 application, or SN74AHC74PWG4 equivalent, key selection criteria include its TSSOP-14 package, dual-channel edge-triggered storage behavior, guaranteed setup/hold timing (5 ns tsu, 0.5 ns th at 5 V), ESD robustness (±2000 V HBM), and compatibility with mixed-voltage 3.3 V/5 V systems.
Technical Context
The SN74AHC74PWG4 implements two independent CMOS D-type flip-flops sharing no internal coupling-each channel features separate D, CLK, PRE, CLR, Q, and Q̅ terminals. Clock triggering occurs on the positive-going edge at a defined voltage threshold, not dependent on input slew rate.
Asynchronous PRE and CLR inputs override clocked operation: low assertion forces Q = HIGH or Q = LOW respectively, regardless of CLK or D state. When both are high, data transfers from D to Q only on CLK's rising edge, provided setup (5 ns min at 5 V) and hold (0.5 ns min) requirements are met.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 5.5 V - supports direct interface with 3.3 V and 5 V logic families without level shifters |
| Max Clock Frequency | 110 MHz at VCC = 5 V, CL = 15 pF - enables reliable clock division by two up to 55 MHz system clocks |
| Propagation Delay | 8.5 ns (tPLH/tPHL, CLK→Q, VCC = 5 V, CL = 15 pF) - ensures tight timing margins in synchronous state machines |
| Output Drive | ±8 mA at VCC = 5 V - sufficient to drive multiple 74AHC inputs or small capacitive loads (<50 pF) |
| ESD Rating (HBM) | ±2000 V - meets industrial handling requirements without additional protection circuitry |
| Operating Temperature | –40 °C to +125 °C - qualified for automotive under-hood and industrial control environments |
| Input Transition Rate | 20 ns/V max (VCC = 5 V) - mandates clean, fast-rising clock edges to prevent metastability or oscillation |
Pinout & Package
TSSOP-14 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, exposed pad optional, JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLK, 2CLK | Input | Rising-edge clock trigger for respective flip-flop channel; threshold-based, not slew-rate dependent |
| 1D, 2D | Input | Data input sampled on active clock edge; requires 5 ns setup before CLK↑ at 5 V |
| 1PRE, 2PRE | Input | Asynchronous preset (active-low); forces Q = HIGH independent of clock or D |
| 1CLR, 2CLR | Input | Asynchronous clear (active-low); forces Q = LOW independent of clock or D |
| 1Q, 2Q | Output | True output of respective channel; drives loads up to ±8 mA at 5 V |
| 1Q̅, 2Q̅ | Output | Inverted output; complementary to Q, usable for feedback or differential signaling |
| VCC | Power | Positive supply (2–5.5 V); bypass capacitor required close to pin for noise immunity |
| GND | Power | Ground reference; must be low-impedance path for switching current return |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent flip-flops | Enables compact implementation of two-bit registers or toggle pairs without inter-channel timing coupling |
| Asynchronous PRE/CLR | Allows immediate state initialization or reset during power-up, fault recovery, or controller reset sequences |
| Wide VCC range (2–5.5 V) | Permits single-component use across 3.3 V microcontroller I/O and legacy 5 V peripheral buses |
| High noise immunity | Guaranteed VIH = 3.85 V / VIL = 1.65 V at VCC = 5.5 V - rejects >1.3 V of supply noise on inputs |
| Low dynamic power | ICC = 20 µA max at 5.5 V - suitable for battery-backed or low-quiescent-power logic subsystems |
Applications
| Toggle Switch Emulation | Controller Reset Hold |
|---|---|
Use Scenario: Converting a mechanical momentary pushbutton into a latched ON/OFF control signal in space-constrained user interfaces. IC Role / Device Role / Timing Role: SN74AHC74PWG4 configured as toggle flip-flop (D tied to Q̅), clocked by debounced button press. Use Value: Eliminates need for discrete latching hardware or firmware polling; achieves deterministic edge-triggered state change with <5 ns setup margin at 5 V. | Use Scenario: Maintaining stable enable/disable states for peripherals during microcontroller reset or brown-out recovery. IC Role / Device Role / Timing Role: SN74AHC74PWG4 holds Q output constant using asynchronous CLR/PRE while host MCU is inactive. Use Value: Prevents glitch-induced actuation of motors, relays, or displays; leverages guaranteed asynchronous override behavior independent of clock stability. |
| Noise-Tolerant Signal Capture | Divide-by-Two Clock Generation |
Use Scenario: Capturing slow-rising or noisy sensor signals (e.g., thermistor RC outputs) in industrial monitoring systems. IC Role / Device Role / Timing Role: SN74AHC74PWG4 samples conditioned input at precise clock edge, rejecting sub-threshold transitions. Use Value: Achieves clean digital registration without external Schmitt triggers; validated for operation with input transition rates down to 20 ns/V at 5 V. | Use Scenario: Generating half-frequency clock domains for low-power peripherals or ADC sampling clocks. IC Role / Device Role / Timing Role: SN74AHC74PWG4 wired as toggle (D→Q̅) driven by master system clock. Use Value: Delivers jitter-controlled 55 MHz output from 110 MHz input (tPLH/tPHL matching ensures 50% duty cycle stability). |
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 |
|---|---|---|---|
| SN74AHC74DBR | SSOP-14 package; 96 °C/W RθJA vs. 147.7 °C/W for PW; identical electrical specs and pinout | Slightly better thermal performance but larger footprint (6.2 mm × 5.3 mm vs. 5.0 mm × 4.4 mm) | Select SN74AHC74DBR when board layout allows SSOP and thermal headroom is critical; otherwise SN74AHC74PWG4 preferred for density. |
| MC74VHC74DT | Pin-compatible VHC-family device; lower drive (±8 mA same), but narrower VCC range (2–5.5 V same), higher ICC (100 µA max) | Higher static power consumption; less suitable for battery-powered or ultra-low-Icc designs | Choose MC74VHC74DT only if legacy VHC design reuse is required; SN74AHC74PWG4 offers superior power efficiency and noise margin. |
Compared with SN74AHC74DBR and MC74VHC74DT, the SN74AHC74PWG4 provides the smallest PCB footprint among AHC-grade dual D-flip-flops while maintaining full 5 V tolerance, 110 MHz speed, and industry-standard ESD robustness-making it optimal for space-constrained, mixed-voltage embedded control.
Availability
SN74AHC74PWG4 is available at Aetrix Electronics and suitable for industrial automation controllers, automotive body electronics, and IoT edge node designs requiring stable component supply, long-term manufacturability, and AEC-Q200-aligned reliability.
Supply support for SN74AHC74PWG4 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 50 years of innovation in high-reliability logic families.
The SN74AHC74PWG4 belongs to TI's advanced high-speed CMOS (AHC) logic portfolio, designed for low-power, high-noise-immunity digital interfacing in automotive, industrial, and communications equipment.
FAQ
What is the maximum clock frequency supported by the SN74AHC74PWG4?
The SN74AHC74PWG4 supports a maximum clock frequency of 110 MHz at VCC = 5 V with a 15 pF load. This value is measured under specified conditions in the official datasheet (SCLS255N, Section 5.9). Performance degrades with higher capacitive loads or lower supply voltages-e.g., 70 MHz at 3.3 V. The SN74AHC74PWG4 does not guarantee operation beyond these published limits.
Does the SN74AHC74PWG4 support 3.3 V-only operation?
Yes, the SN74AHC74PWG4 operates fully across 2 V to 5.5 V, including strict 3.3 V ± 0.3 V systems. At 3.3 V, it delivers 70 MHz max frequency and 14 ns propagation delay (CL = 15 pF), with VIH = 2.1 V and VIL = 0.9 V-ensuring interoperability with standard 3.3 V LVTTL and LVCMOS interfaces without level translation.
How are the PRE and CLR inputs used in the SN74AHC74PWG4?
The SN74AHC74PWG4 features active-low asynchronous PRE and CLR inputs per channel. When PRE is low, Q is forced HIGH regardless of CLK or D; when CLR is low, Q is forced LOW. Both can be used simultaneously (resulting in metastable Q/Q̅), but normal operation requires one held high while the other controls state. These inputs override all clocked behavior.
Is the SN74AHC74PWG4 pin-compatible with older 74LS74 or 74HC74 devices?
The SN74AHC74PWG4 shares identical pinout and logic function with 74HC74 and 74HCT74 in TSSOP-14 (PW) packaging, but differs electrically: it has higher noise immunity (VIH/VIL tighter), faster speed, and lower ICC. It is not pin-compatible with 74LS74 due to different voltage thresholds and drive strength. Always verify timing and loading in mixed-family designs.
What decoupling capacitance is recommended for the SN74AHC74PWG4?
Texas Instruments recommends a 0.1 µF ceramic capacitor placed as close as possible to the VCC pin of the SN74AHC74PWG4, with short, low-inductance traces to GND. For systems with high-frequency noise, paralleling a 1 µF capacitor is acceptable. This mitigates supply transients caused by simultaneous output switching and ensures stable operation up to 110 MHz.
SN74AHC74PWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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:
- 115 MHz
- Max Propagation Delay @ V, Max CL:
- 9.3ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 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
SN74AHC74PWG4 FAQ
1.How can I place an order for SN74AHC74PWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC74PWG4 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 SN74AHC74PWG4 reliable?
The price and inventory of SN74AHC74PWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC74PWG4 is usually 5 days.
3.What payment methods are accepted for SN74AHC74PWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC74PWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC74PWG4?
SN74AHC74PWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC74PWG4 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 SN74AHC74PWG4?
For technical support, including SN74AHC74PWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC74PWG4 requirements.
6.How does Aetrix verify that SN74AHC74PWG4 is sourced from the original manufacturer or authorized distributors?
All SN74AHC74PWG4 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 SN74AHC74PWG4 meets industry standards.
7.What is the process for return or replacement of SN74AHC74PWG4?
All SN74AHC74PWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC74PWG4, 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 SN74AHC74PWG4 part is unused and in its original packaging.
Return procedure for SN74AHC74PWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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