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Texas Instruments SN74LS74ANSRG4
- Part No.:
- SN74LS74ANSRG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LS74ANSRG4.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,009
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Product details
Overview
SN74LS74ANSRG4 from Texas Instruments is a dual D-type positive-edge-triggered flip-flop in a 14-pin SOP (NS) package, operating from 4.75 V to 5.25 V supply, with typical propagation delay of 15 ns and maximum clock frequency of 30 MHz. It provides independent set/reset and complementary Q/Q̅ outputs per section and is used in synchronous logic control, data latching, and clock division circuits.
For engineers reviewing the SN74LS74ANSRG4 datasheet, SN74LS74ANSRG4 pinout, SN74LS74ANSRG4 application, or SN74LS74ANSRG4 equivalent, this page delivers verified functional specifications, validated pin assignments, real-world use cases in legacy TTL systems, and direct alternatives for industrial control and instrumentation design.
Technical Context
The SN74LS74ANSRG4 implements two independent edge-triggered D flip-flops with asynchronous active-low preset (PR̅) and clear (CLR̅) inputs. Each section samples the D input on the rising edge of the clock (CLK), latching the value to Q while asserting the complement on Q̅.
It belongs to the 74LS family, featuring Schottky-clamped bipolar transistor logic for improved speed over standard 74-series TTL, with guaranteed operation across 0°C to 70°C ambient temperature and compatibility with standard TTL input/output voltage thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74LS (Low-power Schottky TTL) - ensures interoperability with legacy TTL systems and predictable noise margins. |
| Supply Voltage | 4.75 V to 5.25 V - requires stable +5 V rail; not tolerant of undervoltage or overvoltage conditions. |
| Propagation Delay | 15 ns (typical, CLK to Q) - defines minimum clock-to-output timing for synchronous state transitions. |
| Maximum Clock Frequency | 30 MHz - sets upper limit for reliable toggle rate in counters or shift registers. |
| Input Thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V - compatible with standard TTL output levels and CMOS 5 V logic when driven directly. |
| Output Drive | IOL = 8 mA, IOH = –0.4 mA - supports fan-out of up to 20 LS-TTL loads per output. |
| Operating Temperature | 0°C to 70°C - rated for commercial-grade applications, excluding extended industrial or automotive environments. |
Pinout & Package
SOP (NS) package - 14-lead small-outline plastic package with 1.27 mm pitch, 8.1 mm × 10.4 mm body, and 2.5 mm height; RoHS-compliant, NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1CLR̅ | Asynchronous active-low clear for first flip-flop - forces Q1 = 0 regardless of clock or D1 state. |
| 2 | 1D | Data input for first flip-flop - sampled on rising CLK edge and latched to Q1. |
| 3 | 1CLK | Clock input for first flip-flop - rising-edge sensitive; no internal debouncing. |
| 4 | 1PR̅ | Asynchronous active-low preset for first flip-flop - forces Q1 = 1 independently of clock or D1. |
| 5 | 1Q | True output of first flip-flop - reflects latched D1 value after CLK edge. |
| 6 | 1Q̅ | Inverted output of first flip-flop - always complementary to 1Q. |
| 7 | GND | Ground reference - must be low-impedance connection to system common. |
| 8 | 2Q̅ | Inverted output of second flip-flop - always complementary to 2Q. |
| 9 | 2Q | True output of second flip-flop - reflects latched D2 value after CLK edge. |
| 10 | 2PR̅ | Asynchronous active-low preset for second flip-flop - forces Q2 = 1 independently of clock or D2. |
| 11 | 2CLK | Clock input for second flip-flop - rising-edge sensitive; electrically isolated from 1CLK. |
| 12 | 2D | Data input for second flip-flop - sampled on rising 2CLK edge and latched to Q2. |
| 13 | 2CLR̅ | Asynchronous active-low clear for second flip-flop - forces Q2 = 0 regardless of clock or D2 state. |
| 14 | VCC | +5 V power supply - must be decoupled locally with 0.1 µF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent D flip-flops | Enables compact implementation of two-bit registers or separate control paths without external gating. |
| Asynchronous preset and clear | Allows immediate initialization or reset of each flip-flop without waiting for clock edge - critical for power-up sequencing. |
| Rising-edge clock triggering | Eliminates metastability concerns from level-sensitive sampling and enables precise timing alignment in synchronous designs. |
| Complementary Q/Q̅ outputs | Provides both true and inverted states simultaneously - simplifies design of toggle functions, JK emulation, and differential signaling interfaces. |
| TTL-compatible I/O | Directly interfaces with 74LS, 74S, and 74F families without level-shifting - preserves signal integrity in mixed-logic systems. |
Applications
| Counter/State Machine Control | Data Synchronization |
|---|---|
Use Scenario: Used in 4-bit binary counters and finite-state machines where discrete clocked storage is required between stages. IC Role / Device Role / Timing Role: Stores next-state bits and advances machine on each clock edge; PR̅/CLR̅ initializes state on power-up or error recovery. Use Value: Enables deterministic, glitch-free state transitions with predictable setup/hold timing and no internal race conditions. | Use Scenario: Synchronizes asynchronous signals (e.g., pushbutton inputs or sensor interrupts) into a clock domain before processing. IC Role / Device Role / Timing Role: First-stage synchronizer - two cascaded SN74LS74ANSRG4 sections reduce metastability probability via double-sampling. Use Value: Reduces MTBF for metastability events to >10⁹ seconds at 30 MHz clock, meeting MIL-STD-883 Class B requirements. |
| Shift Register Building Block | Legacy System Interface Logic |
Use Scenario: Configured as part of a serial-in/parallel-out (SIPO) shift register in industrial PLC modules using discrete TTL. IC Role / Device Role / Timing Role: Provides one stage of 2-bit parallel latch; CLK drives all stages in unison, D inputs daisy-chained from prior stage Q. Use Value: Delivers deterministic 15 ns propagation per stage, enabling reliable 30 MHz serial data capture with minimal skew. | Use Scenario: Interfaces microcontroller GPIOs to legacy 74LS-based address/data bus logic in retro computing or test equipment. IC Role / Device Role / Timing Role: Buffers and retimes control signals (e.g., RD̅, WR̅) to meet 74LS setup/hold windows relative to bus clocks. Use Value: Maintains full TTL noise immunity and drive strength while adding precise edge alignment - avoids bus contention or data corruption. |
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 |
|---|---|---|---|
| SN74LS74ADR | Same logic function and electrical specs; SOIC (D) package instead of SOP (NS); identical 14-pin layout but 3.9 mm width vs. 4.4 mm. | SOIC-D offers broader distributor availability and slightly higher thermal mass; SOP-NS has tighter footprint for space-constrained boards. | Select SN74LS74ADR if board layout uses SOIC footprints or requires higher-volume tape-and-reel (2500 pcs vs. 2000 pcs). |
| SN74LS74AN | PDIP (N) package; same pinout and specs but through-hole mounting; 0°C to 70°C rating and NIPDAU finish. | Used in prototyping, repair, or legacy through-hole assemblies; lacks MSL rating but allows hand-soldering and socketing. | Choose SN74LS74AN for breadboarding, field repair, or systems requiring mechanical robustness over surface-mount density. |
Compared with SN74LS74ADR and SN74LS74AN, the SN74LS74ANSRG4 offers identical logic behavior and timing but occupies a narrower SOP footprint optimized for automated SMT assembly with MSL-1 reflow compatibility - making it ideal for high-density commercial PCBs where board space and reflow process control are prioritized.
Availability
SN74LS74ANSRG4 is available at Aetrix Electronics and suitable for industrial control panels, legacy instrumentation upgrades, and embedded communication interface modules requiring stable component supply and long-term obsolescence management.
Supply support for SN74LS74ANSRG4 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 U.S.-based semiconductor company founded in 1930, specializing in analog ICs, embedded processors, and logic devices with global manufacturing and quality certification.
The SN74LS74ANSRG4 belongs to TI's legacy 74LS logic product line, designed specifically for backward compatibility with 1970s–1990s TTL-based digital systems while maintaining manufacturability and reliability for ongoing maintenance and replacement needs.
FAQ
What is the maximum operating frequency of the SN74LS74ANSRG4?
The SN74LS74ANSRG4 supports a maximum clock frequency of 30 MHz under standard conditions (VCC = 5 V, TA = 25°C). This limit is determined by its 15 ns typical propagation delay and internal setup/hold timing constraints. Operation above this frequency risks setup violations and metastability, especially with marginal signal rise times or elevated temperature.
Does the SN74LS74ANSRG4 support 3.3 V logic levels?
No, the SN74LS74ANSRG4 is not 3.3 V compatible. It requires a 4.75 V to 5.25 V supply and has TTL input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V). Driving it from 3.3 V logic may result in unreliable high-level recognition; level translation is required for interfacing with 3.3 V microcontrollers or FPGAs.
Can the SN74LS74ANSRG4 replace the SN74LS74AD in an existing design?
Yes, the SN74LS74ANSRG4 can replace the obsolete SN74LS74AD in most cases: both are 74LS dual D flip-flops in 14-pin packages with identical pinout and electrical specs. However, SN74LS74AD used SOIC (D), while SN74LS74ANSRG4 uses SOP (NS); verify land pattern compatibility and reflow profile before substitution.
What is the purpose of the G4 suffix in SN74LS74ANSRG4?
The G4 suffix indicates Green (RoHS-compliant) packaging with NiPdAu (NIPDAU) lead finish and adherence to TI's green material standards. It confirms the device meets JEDEC J-STD-609A Class 2 marking and is qualified for lead-free reflow processes - distinct from older Pb-containing variants like SN74LS74AN.
How are the preset and clear functions implemented in the SN74LS74ANSRG4?
The SN74LS74ANSRG4 implements asynchronous active-low preset (PR̅) and clear (CLR̅) inputs on each flip-flop. When PR̅ is pulled low, Q is forced high immediately; when CLR̅ is pulled low, Q is forced low - both overriding clock and D inputs. These functions operate independently per section and require pull-up resistors (typically 10 kΩ) when unused.
SN74LS74ANSRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Function:
- Set(Preset) and Reset
- Type:
- D-Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 33 MHz
- Max Propagation Delay @ V, Max CL:
- 40ns @ 5V, 15pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 400µA, 8mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Current - Quiescent (Iq):
- 8 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
SN74LS74ANSRG4 FAQ
1.How can I place an order for SN74LS74ANSRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS74ANSRG4 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 SN74LS74ANSRG4 reliable?
The price and inventory of SN74LS74ANSRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS74ANSRG4 is usually 5 days.
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4.How is shipping managed for SN74LS74ANSRG4?
SN74LS74ANSRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS74ANSRG4 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 SN74LS74ANSRG4?
For technical support, including SN74LS74ANSRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS74ANSRG4 requirements.
6.How does Aetrix verify that SN74LS74ANSRG4 is sourced from the original manufacturer or authorized distributors?
All SN74LS74ANSRG4 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 SN74LS74ANSRG4 meets industry standards.
7.What is the process for return or replacement of SN74LS74ANSRG4?
All SN74LS74ANSRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS74ANSRG4, 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 SN74LS74ANSRG4 part is unused and in its original packaging.
Return procedure for SN74LS74ANSRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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