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

Texas Instruments SN74LS107ANSR

Name: SN74LS107ANSR
Brand: Texas Instruments
SKU: SN74LS107ANSR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LS107ANSR

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: 14-SOIC (0.209", 5.30mm Width)

Datasheet:: SN74LS107ANSR.pdf

Description:: IC FF JK TYPE DUAL 1BIT 14SOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SN74LS107ANSR from Texas Instruments is a dual negative-edge-triggered J-K flip-flop with individual asynchronous clear inputs, fabricated in LS-TTL logic, operating over 0°C to 70°C, with typical propagation delay of 15 ns at V_CC = 5 V and I_OL = 8 mA, used in synchronous counters and state-machine control circuits.

For engineers reviewing the SN74LS107ANSR datasheet, SN74LS107ANSR pinout, SN74LS107ANSR application, or SN74LS107ANSR equivalent, this device supports discrete sequential logic design requiring deterministic edge-triggered storage, low-power TTL compatibility, and industrial-temperature-grade reliability in legacy digital systems.

Technical Context

Each flip-flop features independent J, K, clock (CLK), and active-low clear (/CLR) inputs, with complementary Q and /Q outputs. The device uses bipolar transistor-transistor logic (TTL) with Schottky clamping for improved speed and noise immunity.

Operation requires a single +5 V supply; no biasing or external pull-ups are needed. Clocking is synchronized to the falling edge of CLK, and /CLR overrides clock and data inputs asynchronously-resetting Q to LOW regardless of J/K states.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	LS-TTL - ensures compatibility with 74LS-series interface levels and drive capability.
Propagation Delay (t_PLH/t_PHL)	15 ns max at V_CC = 5 V, C_L = 15 pF - defines maximum clock-to-output timing for synchronous counter stages.
Output Drive (I_OH/I_OL)	-0.4 mA / 8 mA - supports direct fan-out to ≥10 standard TTL loads without buffering.
Supply Voltage Range	4.75 V to 5.25 V - mandates regulated +5 V rail; operation outside this range risks logic instability or latch-up.
Operating Temperature	0°C to +70°C - validated for commercial-grade PCBs in non-military, non-automotive embedded control environments.
Input Threshold (V_IL/V_IH)	0.8 V / 2.0 V - guarantees robust noise margin against ground bounce and crosstalk in dense digital layouts.

Pinout & Package

SOP (NS) package - 14-pin small-outline integrated circuit with 1.27 mm pitch, 8.75 mm × 3.91 mm body, 1.75 mm max height, and tape-and-reel delivery (2000 units per reel).

Pin/Terminal	Circuit Role	Design Meaning
1	/CLR1	Asynchronous active-low reset for Flip-Flop 1 - forces Q1 = LOW independent of clock or J/K.
2	CLK1	Clock input for Flip-Flop 1 - triggers state change on falling edge only.
3	J1	Data input for Flip-Flop 1 - sets next-state HIGH when K1 = LOW and CLK falls.
4	K1	Complement data input for Flip-Flop 1 - enables toggle (J1=K1=HIGH) or reset (J1=LOW, K1=HIGH).
5	Q1	True output of Flip-Flop 1 - provides registered logic level synchronized to CLK1 falling edge.
6	/Q1	Inverted output of Flip-Flop 1 - electrically complementary to Q1; usable as feedback or enable signal.
7	GND	Power return reference - must be low-impedance connection to minimize ground bounce in multi-stage logic.
8	/Q2	Inverted output of Flip-Flop 2 - isolated from Q1 path; supports independent dual-channel sequencing.
9	Q2	True output of Flip-Flop 2 - identical timing behavior to Q1 but electrically separate.
10	K2	Complement data input for Flip-Flop 2 - shares same functional definition as K1 but for second stage.
11	J2	Data input for Flip-Flop 2 - independently controllable from J1; enables dual counter or shift register cells.
12	CLK2	Clock input for Flip-Flop 2 - falling-edge sensitive; may be tied to CLK1 or driven separately.
13	/CLR2	Asynchronous active-low reset for Flip-Flop 2 - independent of /CLR1; allows selective reset.
14	V_CC	+5 V power supply - requires local 0.1 µF ceramic decoupling adjacent to pin to suppress switching noise.

Key Features

Feature	Design Value
Dual independent J-K flip-flops	Enables two-bit synchronous state storage in one IC - reduces board space vs. discrete FF implementations.
Asynchronous active-low clear	Permits immediate, clock-independent initialization of each flip-flop - critical for power-on reset and fault recovery.
Falling-edge clock triggering	Eliminates metastability risk from setup/hold violations on rising edges - simplifies timing analysis in cascaded counters.
LS-TTL compatible I/O levels	Guarantees interoperability with 74LS, 74S, and 74F families without level-shifting - preserves legacy system signal integrity.
14-pin SOP (NS) packaging	Supports automated SMT assembly with industry-standard land pattern (IPC-7351 SOIC-14) and 1.27 mm pitch routing.

Applications

Binary Counter Stage	State-Machine Register
Use Scenario: Two-stage ripple counter for divide-by-4 clock generation in microcontroller peripheral timing circuits. IC Role / Device Role / Timing Role: Each SN74LS107ANSR flip-flop serves as a clocked memory element toggling on every falling edge of its input clock or previous stage's Q output. Use Value: Provides deterministic modulo-4 division with predictable 15 ns propagation delay per stage - enabling accurate sub-clock domain timing without PLL complexity.	Use Scenario: Control register in a 4-state traffic light sequencer using discrete logic instead of MCU firmware. IC Role / Device Role / Timing Role: SN74LS107ANSR stores current state (e.g., RED→YELLOW→GREEN→WAIT) and advances via decoded J/K inputs driven by combinational logic. Use Value: Delivers glitch-free state transitions with asynchronous /CLR for emergency red override - eliminating software boot latency and flash wear concerns.
Shift Register Cell	Frequency Divider
Use Scenario: 2-bit serial-in/parallel-out shift register for LED pattern control in industrial HMI panels. IC Role / Device Role / Timing Role: SN74LS107ANSR flip-flops accept serial data on J inputs while CLK2 is daisy-chained from Q1 to drive CLK2, shifting bits leftward. Use Value: Achieves reliable bit-shifting at up to 33 MHz (based on 15 ns t_P) with TTL-level drive - suitable for real-time visual feedback without FPGA resources.	Use Scenario: Divide-by-2 frequency synthesizer for generating 1 MHz from a 2 MHz crystal oscillator in legacy test equipment. IC Role / Device Role / Timing Role: SN74LS107ANSR configured as toggle flip-flop (J=K=HIGH) accepts master clock on CLK1 and delivers halved-frequency square wave at Q1. Use Value: Produces symmetrical 50% duty-cycle output with <±1 ns skew between rising/falling edges - meeting timing requirements for analog-to-digital sampling clocks.

Binary Counter Stage

State-Machine Register

Use Scenario: Two-stage ripple counter for divide-by-4 clock generation in microcontroller peripheral timing circuits.

IC Role / Device Role / Timing Role: Each SN74LS107ANSR flip-flop serves as a clocked memory element toggling on every falling edge of its input clock or previous stage's Q output.

Use Value: Provides deterministic modulo-4 division with predictable 15 ns propagation delay per stage - enabling accurate sub-clock domain timing without PLL complexity.

Use Scenario: Control register in a 4-state traffic light sequencer using discrete logic instead of MCU firmware.

IC Role / Device Role / Timing Role: SN74LS107ANSR stores current state (e.g., RED→YELLOW→GREEN→WAIT) and advances via decoded J/K inputs driven by combinational logic.

Use Value: Delivers glitch-free state transitions with asynchronous /CLR for emergency red override - eliminating software boot latency and flash wear concerns.

Shift Register Cell

Frequency Divider

Use Scenario: 2-bit serial-in/parallel-out shift register for LED pattern control in industrial HMI panels.

IC Role / Device Role / Timing Role: SN74LS107ANSR flip-flops accept serial data on J inputs while CLK2 is daisy-chained from Q1 to drive CLK2, shifting bits leftward.

Use Value: Achieves reliable bit-shifting at up to 33 MHz (based on 15 ns t_P) with TTL-level drive - suitable for real-time visual feedback without FPGA resources.

Use Scenario: Divide-by-2 frequency synthesizer for generating 1 MHz from a 2 MHz crystal oscillator in legacy test equipment.

IC Role / Device Role / Timing Role: SN74LS107ANSR configured as toggle flip-flop (J=K=HIGH) accepts master clock on CLK1 and delivers halved-frequency square wave at Q1.

Use Value: Produces symmetrical 50% duty-cycle output with <±1 ns skew between rising/falling edges - meeting timing requirements for analog-to-digital sampling clocks.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LS76AN	Includes preset (/PRE) in addition to /CLR; identical LS-TTL specs and 14-pin PDIP package.	Required where simultaneous set/reset capability is needed - e.g., bidirectional counter initialization.	Select SN74LS76AN only if /PRE functionality is explicitly required; otherwise SN74LS107ANSR offers lower cost and SOP packaging.
SN74HC107DR	CMOS-based (74HC), higher noise immunity, wider V_CC range (2–6 V), but slower t_P (25 ns typ) and non-TTL-compatible inputs.	Suitable for mixed-voltage systems or battery-powered designs where power efficiency > speed.	Choose SN74HC107DR for 3.3 V operation or ultra-low static current; avoid if interfacing directly with legacy 5 V TTL buses.

Compared with SN74LS76AN and SN74HC107DR, the SN74LS107ANSR delivers optimal balance of LS-TTL compatibility, SOP footprint, and 15 ns propagation performance for cost-sensitive, 5 V-only industrial control logic - without redundant features or voltage-range compromises.

Availability

SN74LS107ANSR is available at Aetrix Electronics and suitable for binary counter stages, state-machine registers, shift register cells, and frequency dividers requiring stable component supply across long-lifecycle industrial programs.

Supply support for SN74LS107ANSR 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, embedded processing, and logic ICs with broad industrial and automotive qualification.

The SN74LS107ANSR belongs to TI's legacy 74LS logic family, designed specifically for robust, pin-compatible replacement of earlier 74107 devices in commercial-grade digital control systems requiring TTL-level interoperability and proven reliability.

FAQ

What is the maximum clock frequency supported by the SN74LS107ANSR?

The SN74LS107ANSR does not specify a maximum clock frequency in its datasheet; instead, it guarantees a maximum propagation delay of 15 ns (t_PLH/t_PHL) under standard load conditions. This implies reliable operation up to approximately 33 MHz in ideal setups, though practical frequency limits depend on board layout, fan-out, and supply stability. For guaranteed timing, designers must validate setup/hold margins using the published 15 ns parameter in their specific circuit.

Does the SN74LS107ANSR support synchronous reset or only asynchronous clear?

The SN74LS107ANSR provides only asynchronous active-low clear (/CLR1 and /CLR2); it does not include synchronous reset functionality. Each /CLR input forces the corresponding Q output LOW immediately, regardless of clock state or J/K inputs. To implement synchronous reset, external combinational logic must gate the J/K inputs or use the /CLR line under clock-controlled enable - a common technique in discrete state-machine design using the SN74LS107ANSR.

Can the SN74LS107ANSR be used in place of the older SN74107?

Yes, the SN74LS107ANSR is a direct functional and pin-compatible upgrade to the original SN74107, offering improved speed (15 ns vs. 45 ns typical), lower power consumption, and Schottky-clamped TTL inputs. Both share identical pinout, logic function, and 14-pin SOP/PDIP packaging options. Designers may substitute SN74LS107ANSR without layout changes, provided the 0°C to +70°C temperature range meets system requirements.

What is the recommended decoupling for the SN74LS107ANSR V_CC pin?

Texas Instruments recommends a 0.1 µF ceramic capacitor placed as close as possible to the V_CC pin (Pin 14) of the SN74LS107ANSR, with short, low-inductance traces to GND (Pin 7). This minimizes high-frequency supply noise generated during output switching. For boards with multiple SN74LS107ANSR devices, a bulk 4.7 µF–10 µF tantalum or aluminum electrolytic capacitor should supplement local ceramics near the power entry point.

Is the SN74LS107ANSR RoHS compliant?

Yes, the SN74LS107ANSR is RoHS compliant, as confirmed in TI's Packaging Information documentation: "RoHS: Yes" and "Lead finish/Ball material: NIPDAU". It meets EU Directive 2011/65/EU requirements with lead-free terminations and conforms to TI's standard RoHS statement. No exemptions apply, and the device is suitable for new designs targeting global environmental compliance.

SN74LS107ANSR 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:: Active

Function:: Master Reset

Type:: JK Type

Output Type:: Complementary

Number of Elements:: 2

Number of Bits per Element:: 1

Clock Frequency:: 45 MHz

Max Propagation Delay @ V, Max CL:: 20ns @ 5V, 15pF

Trigger Type:: Negative Edge

Current - Output High, Low:: 400µA, 8mA

Voltage - Supply:: 4.75V ~ 5.25V

Current - Quiescent (Iq):: 6 mA

Input Capacitance:: -

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SO

SN74LS107ANSR FAQ

1.How can I place an order for SN74LS107ANSR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LS107ANSR 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 SN74LS107ANSR reliable?

The price and inventory of SN74LS107ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS107ANSR is usually 5 days.

3.What payment methods are accepted for SN74LS107ANSR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS107ANSR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LS107ANSR?

SN74LS107ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LS107ANSR 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 SN74LS107ANSR?

For technical support, including SN74LS107ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS107ANSR requirements.

6.How does Aetrix verify that SN74LS107ANSR is sourced from the original manufacturer or authorized distributors?

All SN74LS107ANSR 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 SN74LS107ANSR meets industry standards.

7.What is the process for return or replacement of SN74LS107ANSR?

All SN74LS107ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS107ANSR, 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 SN74LS107ANSR part is unused and in its original packaging.

Return procedure for SN74LS107ANSR:

1.Submit a request within 90 days.

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

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