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Texas Instruments SN74LS107AD
- Part No.:
- SN74LS107AD
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LS107AD.pdf
- Description:
- IC FF JK TYPE DUAL 1BIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,967
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Product details
Overview
SN74LS107AD 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 and maximum supply current of 24 mA at 5 V. It serves as a synchronous storage element in digital control sequencers and state machines.
For engineers reviewing the SN74LS107AD datasheet, SN74LS107AD pinout, SN74LS107AD application, or SN74LS107AD equivalent, this device is selected for discrete logic timing integrity, low-power TTL compatibility, and legacy system replacement where edge-triggered bistable operation with independent reset is required.
Technical Context
The SN74LS107AD implements two independent J-K flip-flops sharing no internal logic; each has dedicated J, K, clock, and active-low clear inputs plus Q and Q̅ outputs. Clocking is negative-edge-triggered, and clear is asynchronous and active-low.
It uses bipolar LS-TTL process technology, ensuring compatibility with standard 74LS family voltage thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and drive capability (IOH = –0.4 mA, IOL = 8 mA), with guaranteed operation up to 30 MHz maximum toggle frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74LS (Low-power Schottky TTL) - ensures interoperability with legacy 74LS/74S systems and defined noise margins. |
| Function | Dual J-K flip-flop with independent asynchronous clear - enables two-bit synchronous state storage with per-stage reset control. |
| Trigger Edge | Negative clock edge - synchronizes state changes on falling transitions, critical for deterministic timing in sequential logic. |
| Propagation Delay | 15 ns max (tPLH/tPHL at VCC = 5 V, CL = 15 pF) - defines worst-case setup-to-output timing for pipeline depth planning. |
| Supply Voltage | 4.75 V to 5.25 V - requires regulated 5 V rail; not tolerant of wider ranges like CMOS variants. |
| Operating Temperature | 0°C to +70°C - rated for commercial-grade environments, excluding extended industrial or military use. |
| Output Drive | IOL = 8 mA / IOH = –0.4 mA - supports direct fanout to up to 20 LS-TTL inputs without buffering. |
Pinout & Package
SN74LS107AD is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package, 3.9 mm wide, 8.65 mm long, 1.75 mm max height, RoHS-compliant with NiPdAu lead finish and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1CLR̅ | Active-low asynchronous clear for first flip-flop - forces Q1 = 0 regardless of clock or J/K state. |
| 2 | 1J | Data input J for first flip-flop - controls set behavior when clocked (J=1, K=0 → Q=1). |
| 3 | 1CLK | Clock input for first flip-flop - triggers state update on falling edge only. |
| 4 | 1K | Data input K for first flip-flop - controls reset behavior when clocked (J=0, K=1 → Q=0). |
| 5 | 1Q̅ | Inverted output of first flip-flop - provides complementary logic state for feedback or decoding. |
| 6 | 1Q | True output of first flip-flop - primary stored bit output, TTL-compatible voltage levels. |
| 7 | GND | Ground reference - must be low-impedance connection to minimize switching noise coupling. |
| 8 | 2Q | True output of second flip-flop - electrically isolated from first stage, same drive strength. |
| 9 | 2Q̅ | Inverted output of second flip-flop - supports differential signaling or NAND-based feedback paths. |
| 10 | 2K | Data input K for second flip-flop - independent of first stage; enables dual-bit counter or register functions. |
| 11 | 2CLK | Clock input for second flip-flop - may share clock net or be driven separately for staggered sequencing. |
| 12 | 2J | Data input J for second flip-flop - full J-K functionality decoupled from first stage. |
| 13 | 2CLR̅ | Active-low asynchronous clear for second flip-flop - independent reset control per stage. |
| 14 | VCC | +5 V power supply - must be bypassed locally with 0.1 µF ceramic capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Independent asynchronous clear per flip-flop | Enables selective reset of one stage without disturbing the other - essential for multi-phase controllers. |
| Negative-edge clock triggering | Eliminates metastability risk from asynchronous clock domain crossings within same IC. |
| LS-TTL compatible input thresholds | Guarantees interoperability with 74LS, 74S, and 74F families without level-shifting circuitry. |
| 14-pin SOIC packaging | Reduces PCB area vs. PDIP while maintaining hand-solderability and automated assembly compatibility. |
| Specified 30 MHz toggle frequency | Supports reliable operation in high-speed counters and shift registers up to 15 MHz clock rate. |
Applications
| Binary Counter Stage | State Machine Register |
|---|---|
Use Scenario: Used as a divide-by-2 stage in ripple counters or as a toggle flip-flop in synchronous binary counters. IC Role / Device Role / Timing Role: Stores one bit of count state; toggles on each clock edge when J=K=1, with clear enabling zero-reset. Use Value: Provides predictable, edge-triggered division with minimal external logic - reduces gate count in fixed-modulus counters. | Use Scenario: Implements a two-bit finite state machine (e.g., traffic light controller) requiring stable, clocked state retention. IC Role / Device Role / Timing Role: Holds current state bits; J/K inputs driven by combinational logic decoding next-state conditions. Use Value: Enables deterministic state transitions synchronized to system clock edge - eliminates race conditions in Moore-type machines. |
| Serial Data Latch | Pulse Width Modulator Feedback |
Use Scenario: Captures serial data bits under strobe control in parallel-load shift registers or data acquisition interfaces. IC Role / Device Role / Timing Role: Acts as a synchronous latch; J/K configured as D-type (J=D, K=D̅) to store incoming bit on clock edge. Use Value: Delivers clean, jitter-free sampling of asynchronous signals aligned to master clock domain - improves timing margin. | Use Scenario: Monitors PWM output duty cycle in closed-loop motor control by capturing rising/falling edge timing. IC Role / Device Role / Timing Role: Forms part of edge-detection logic - one flip-flop latches rising edge, second latches falling edge. Use Value: Enables precise pulse-width measurement using only two flip-flops and combinational gates - avoids need for dedicated timer IC. |
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 |
|---|---|---|---|
| SN74LS76N | Includes preset (PRE̅) in addition to clear (CLR̅); identical pinout and AC/DC specs. | Required where asynchronous set functionality is needed alongside clear - e.g., initial state loading. | Select SN74LS76N if PRE̅ is used; otherwise SN74LS107AD offers simpler control for clear-only use cases. |
| SN74HC107DR | CMOS version (74HC), higher noise immunity, wider VCC range (2–6 V), but slower max toggle frequency (22 MHz). | Suitable for mixed-voltage systems or battery-powered designs needing lower static current (< 4 µA). | Choose SN74HC107DR for low-power or multi-rail designs; retain SN74LS107AD for strict 5 V TTL compatibility and speed-critical legacy interfaces. |
Compared with SN74LS76N, SN74LS107AD omits preset functionality - reducing control complexity where only clear is needed. Against SN74HC107DR, it delivers faster toggle performance and guaranteed TTL drive strength but consumes more quiescent power and lacks voltage flexibility.
Availability
SN74LS107AD is available at Aetrix Electronics and suitable for industrial control panels, test equipment interfaces, and legacy system repairs requiring stable component supply and long-term obsolescence mitigation.
Supply support for SN74LS107AD 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 products with broad industrial and automotive qualification.
The SN74LS107AD belongs to TI's legacy 74LS logic family, designed for robust, pin-compatible replacements in discontinued TTL-based systems requiring deterministic edge-triggered storage.
FAQ
What is the maximum clock frequency supported by the SN74LS107AD?
The SN74LS107AD is characterized for reliable operation up to 30 MHz maximum toggle frequency, corresponding to a 15 MHz maximum clock frequency when used in toggle (J=K=1) mode. This rating assumes VCC = 5 V, TA = 25°C, and CL = 15 pF load; actual usable frequency depends on board layout and signal integrity.
Does the SN74LS107AD support synchronous reset or only asynchronous clear?
The SN74LS107AD provides only asynchronous active-low clear (CLR̅) inputs - there is no synchronous reset function. Clear overrides all other inputs including clock, J, and K, forcing Q = 0 immediately upon assertion. Synchronous reset would require external gating logic or a different device such as SN74LS112.
Can the SN74LS107AD be used as a D-type flip-flop?
Yes, the SN74LS107AD can be configured as a D-type flip-flop by connecting J to the data input and K to its inverse (e.g., via inverter or complementary signal). With this wiring, the output Q follows D on the next negative clock edge - effectively emulating D flip-flop behavior while retaining full J-K functionality.
Is the SN74LS107AD RoHS compliant?
Yes, the SN74LS107AD is RoHS compliant, with NiPdAu (nickel-palladium-gold) lead finish and documented compliance per TI's RoHS statement. The "Yes" RoHS flag appears in TI's official packaging addendum, confirming exemption from lead and other restricted substances per EU Directive 2011/65/EU.
What is the recommended bypass capacitor for the SN74LS107AD?
A 0.1 µF ceramic capacitor placed between VCC (pin 14) and GND (pin 7), as close as possible to the SN74LS107AD package, is the standard recommendation. This minimizes high-frequency supply noise induced by simultaneous output switching and ensures stable internal node voltages during fast transitions.
SN74LS107AD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- 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-SOIC
SN74LS107AD FAQ
1.How can I place an order for SN74LS107AD through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS107AD 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 SN74LS107AD reliable?
The price and inventory of SN74LS107AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS107AD is usually 5 days.
3.What payment methods are accepted for SN74LS107AD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS107AD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS107AD?
SN74LS107AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS107AD 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 SN74LS107AD?
For technical support, including SN74LS107AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS107AD requirements.
6.How does Aetrix verify that SN74LS107AD is sourced from the original manufacturer or authorized distributors?
All SN74LS107AD 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 SN74LS107AD meets industry standards.
7.What is the process for return or replacement of SN74LS107AD?
All SN74LS107AD units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS107AD, 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 SN74LS107AD part is unused and in its original packaging.
Return procedure for SN74LS107AD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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