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Texas Instruments SN74AHC74DRE4
- Part No.:
- SN74AHC74DRE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AHC74DRE4.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,361
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Product details
Overview
SN74AHC74DRE4 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, supporting clock frequencies up to 110 MHz at 5 V, and delivering ±8 mA output drive. It implements synchronous data latching on rising clock edges and asynchronous set/reset for state initialization-used in digital logic control, clock division, and signal debouncing circuits.
For engineers reviewing the SN74AHC74DRE4 datasheet, SN74AHC74DRE4 pinout, SN74AHC74DRE4 application, or SN74AHC74DRE4 equivalent, key selection considerations include its 14-pin SOIC (D) package, dual-channel independent operation, guaranteed timing parameters at both 3.3 V and 5 V, ESD robustness per JESD22, and compatibility with standard CMOS input thresholds.
Technical Context
The SN74AHC74DRE4 integrates two identical edge-triggered D flip-flops sharing no internal coupling-each channel features dedicated CLK, D, PRE, CLR, Q, and Q̅ terminals. Its triggering mechanism responds to voltage-level crossing rather than edge slew rate, enabling reliable operation with slow-rising clocks.
Asynchronous PRE and CLR override clock and data inputs, forcing Q = H or Q = L respectively when asserted low; when both are high, data transfers on the rising edge of CLK only if setup (5 ns min at 5 V) and hold (0.5 ns) timing constraints are met. Output drive strength and propagation delay (tPLH/tPHL ≤ 8.5 ns at 5 V, CL = 15 pF) are specified across –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 5.5 V - supports mixed-voltage system interfacing and battery-powered operation down to 2 V. |
| Max Clock Frequency | 110 MHz at VCC = 5 V, CL = 15 pF - enables use in high-speed digital control and clock division up to 55 MHz per stage. |
| Output Drive | ±8 mA at VCC = 5 V - sufficient to directly drive multiple 74AHC inputs or small capacitive loads without buffering. |
| Propagation Delay | ≤8.5 ns (CLK→Q, VCC = 5 V, CL = 15 pF) - ensures tight timing margins in synchronous state machines and counters. |
| Input Thresholds | VIH = 3.85 V, VIL = 1.65 V at VCC = 5.5 V - compatible with TTL and 5 V CMOS logic families without level shifting. |
| ESD Rating | ±2000 V HBM - meets industrial handling requirements and reduces susceptibility to assembly-line ESD damage. |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial motor-control environments. |
Pinout & Package
SN74AHC74DRE4 is packaged in a 14-pin SOIC (D) body measuring 8.65 mm × 3.91 mm × 1.75 mm, with standard 1.27 mm pitch and gull-wing leads. Thermal resistance RθJA = 124.5°C/W reflects typical board-level dissipation for this surface-mount outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLK, 2CLK | Clock input (channel 1 & 2) | Rising-edge sensitive; triggers Q update only when PRE/CLR are inactive (high); voltage-level triggered, not slew-rate dependent. |
| 1D, 2D | Data input (channel 1 & 2) | Samples and holds value at rising CLK edge if setup/hold times met; unaffected by D changes during hold interval. |
| 1PRE, 2PRE | Asynchronous preset (active-low) | Forces Q = H regardless of CLK/D state; overrides all synchronous logic when pulled low. |
| 1CLR, 2CLR | Asynchronous clear (active-low) | Forces Q = L regardless of CLK/D state; operates independently per channel. |
| 1Q, 2Q | True output (channel 1 & 2) | CMOS push-pull output; capable of sourcing/sinking ±8 mA at 5 V; must not be shorted to opposing outputs. |
| 1Q̅, 2Q̅ | Inverted output (channel 1 & 2) | Complementary to Q; electrically isolated but logically paired; useful for toggle configurations and differential signaling. |
| VCC | Positive supply | Single 2–5.5 V rail powers both channels; requires local 0.1 µF bypass capacitor near pin 14. |
| GND | Ground reference | Common return for all I/O and internal circuitry; must be low-impedance connection to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent flip-flops | Enables compact implementation of two-bit registers, toggle pairs, or synchronized control signals without inter-channel timing dependency. |
| Asynchronous set/reset per channel | Allows deterministic power-up initialization, emergency reset, or fault recovery without waiting for clock edges. |
| Wide VCC range (2–5.5 V) | Permits direct interface with 3.3 V microcontrollers and 5 V legacy peripherals while maintaining full timing performance. |
| High noise immunity | Guaranteed 1.65 V noise margin at 5 V supply supports reliable operation in electrically noisy motor-drive or industrial PLC environments. |
| Low dynamic power consumption | ICC ≤ 20 µA at 5.5 V enables use in always-on monitoring circuits with minimal standby current impact. |
Applications
| Toggle Switch Emulation | Controller Reset Hold |
|---|---|
Use Scenario: Replacing mechanical toggle switches with momentary pushbuttons in space-constrained user interfaces. IC Role / Device Role / Timing Role: SN74AHC74DRE4 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, and enables PCB-integrated switch functionality with no moving parts. | Use Scenario: Maintaining stable enable/disable states during microcontroller reset sequences where I/O pins float. IC Role / Device Role / Timing Role: SN74AHC74DRE4 latches a control signal before reset and holds it via GND-referenced PRE/CLR until firmware reasserts control. Use Value: Prevents spurious actuation of downstream drivers or actuators during boot-up or brownout recovery. |
| Noise-Tolerant Signal Conditioning | Divide-by-Two Clock Generation |
Use Scenario: Converting slow-rising or noisy sensor outputs into clean, rail-to-rail logic levels for MCU input. IC Role / Device Role / Timing Role: SN74AHC74DRE4 uses Schmitt-trigger buffered CLK and D inputs to reject sub-threshold transients and ensure single-event sampling. Use Value: Reduces false triggers in industrial proximity sensing or rotary encoder interfaces without external filtering components. | Use Scenario: Generating a precise 50% duty-cycle half-frequency clock from a master oscillator in timing-critical subsystems. IC Role / Device Role / Timing Role: SN74AHC74DRE4 wired as a T-flip-flop (D = Q̅) divides input clock by two with guaranteed edge alignment and minimal jitter accumulation. Use Value: Provides deterministic frequency scaling for ADC sampling clocks, PWM carriers, or communication baud rate derivation. |
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 |
|---|---|---|---|
| SN74AHC74DR | Same die, identical electrical specs, SOIC-14 package; differs only in tape-and-reel packaging (DR vs DRE4) and RoHS status (DR is lead-free, DRE4 is legacy Pb). | No functional difference; DR is active production part, DRE4 is obsolete but available in limited legacy stock. | Select SN74AHC74DR for new designs requiring long-term supply assurance and RoHS compliance. |
| 74LVC74AD,118 | Lower VCC range (1.65–3.6 V), 3.6 V absolute max; faster tPD (~5.5 ns at 3.3 V) but reduced noise margin and no 5 V tolerance. | Suitable only for 3.3 V-only systems; cannot interface directly with 5 V logic without level translation. | Choose 74LVC74AD,118 only when operating exclusively at 3.3 V and higher speed is prioritized over voltage flexibility. |
Compared with SN74AHC74DR and 74LVC74AD,118, the SN74AHC74DRE4 offers unique 2–5.5 V operation and 5 V logic compatibility-making it the sole choice for mixed-voltage or legacy 5 V system integration where pinout and timing equivalence are required.
Availability
SN74AHC74DRE4 is available at Aetrix Electronics and suitable for industrial control panels, automotive body electronics, and test equipment requiring stable component supply with verified legacy footprint compatibility.
Supply support for SN74AHC74DRE4 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 digital ICs.
The SN74AHC74 series belongs to TI's advanced high-speed CMOS logic family, designed for robust, low-power, wide-supply digital interfacing and sequencing in industrial, automotive, and communications infrastructure.
FAQ
What is the maximum clock frequency supported by SN74AHC74DRE4?
The SN74AHC74DRE4 supports a maximum clock frequency of 110 MHz at VCC = 5 V with CL = 15 pF load, and 70 MHz at VCC = 3.3 V under the same conditions. These values are guaranteed across the full operating temperature range (–40°C to +125°C) and reflect worst-case timing performance per the official TI datasheet SCLS255N.
Does SN74AHC74DRE4 support 3.3 V operation?
Yes, SN74AHC74DRE4 fully supports 3.3 V operation within its rated 2 V to 5.5 V supply range. At VCC = 3.3 V ± 0.3 V, it delivers guaranteed tPD ≤ 14 ns, fMAX ≥ 70 MHz, and VIH/VIL thresholds compatible with standard 3.3 V CMOS logic families-no level shifters required.
Can SN74AHC74DRE4 be used as a toggle flip-flop?
Yes, SN74AHC74DRE4 can be configured as a toggle flip-flop by connecting the D input to the inverted output (Q̅). Each rising clock edge then toggles the Q output state. This configuration is explicitly validated in TI's application notes and leverages the device's inherent dual-channel independence for reliable, glitch-free operation.
What is the thermal resistance (RθJA) of SN74AHC74DRE4 in its SOIC package?
The SN74AHC74DRE4 in the 14-pin SOIC (D) package has a junction-to-ambient thermal resistance (RθJA) of 124.5°C/W, measured under standard JEDEC JESD51-2 conditions with a 1-inch² copper pad. This value assumes typical PCB layout with moderate copper area and no forced airflow.
Is SN74AHC74DRE4 RoHS compliant?
No, SN74AHC74DRE4 is not RoHS compliant-it is a legacy part with leaded (SnPb) terminations. For RoHS-compliant alternatives, TI recommends SN74AHC74DR (same SOIC-14 package, lead-free NiPdAu finish, Level-1 moisture sensitivity rating).
SN74AHC74DRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- 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:
- 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-SOIC
SN74AHC74DRE4 FAQ
1.How can I place an order for SN74AHC74DRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC74DRE4 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 SN74AHC74DRE4 reliable?
The price and inventory of SN74AHC74DRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC74DRE4 is usually 5 days.
3.What payment methods are accepted for SN74AHC74DRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC74DRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC74DRE4?
SN74AHC74DRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC74DRE4 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 SN74AHC74DRE4?
For technical support, including SN74AHC74DRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC74DRE4 requirements.
6.How does Aetrix verify that SN74AHC74DRE4 is sourced from the original manufacturer or authorized distributors?
All SN74AHC74DRE4 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 SN74AHC74DRE4 meets industry standards.
7.What is the process for return or replacement of SN74AHC74DRE4?
All SN74AHC74DRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC74DRE4, 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 SN74AHC74DRE4 part is unused and in its original packaging.
Return procedure for SN74AHC74DRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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