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Texas Instruments SN74LS75N
- Part No.:
- SN74LS75N
- Manufacturer:
- Texas Instruments
- Category:
- Latches
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74LS75N.pdf
- Description:
- IC QUAD BISTABLE LATCH 16-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:279
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Product details
Overview
SN74LS75N from Texas Instruments is a quad 2-input bistable latch IC in a 16-pin PDIP package, operating from 4.75 V to 5.25 V with typical propagation delay of 20 ns and output drive capability of ±8 mA. It implements transparent latching logic for data storage in synchronous digital systems, commonly used in address/data bus isolation and register file interfacing.
For engineers reviewing the SN74LS75N datasheet, SN74LS75N pinout, SN74LS75N application, or SN74LS75N equivalent, key selection criteria include TTL-compatible input thresholds, dual-gated transparent latch architecture, DC supply stability across 0°C to 70°C, and legacy through-hole mounting compatibility.
Technical Context
The SN74LS75N contains four independent transparent D-type latches, each with separate enable (G) and data (D) inputs and complementary Q/Q̅ outputs. Each latch operates on active-high enable logic and retains state when G is low.
It uses bipolar Schottky TTL technology, delivering guaranteed fan-out of 20 LS-TTL loads, noise immunity of ≥0.4 V, and input clamp diodes for transient protection. The device lacks internal reset or preset functionality and requires external timing control for synchronous operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | LS-TTL - ensures compatibility with standard 74LS-series interface levels and loading. |
| Supply Voltage | 4.75 V to 5.25 V - mandates regulated +5 V rail; operation outside this range risks invalid logic states. |
| Propagation Delay | 20 ns max (tPLH/tPHL) - defines maximum clock-to-output timing budget in latch-enable paths. |
| Output Drive | ±8 mA (IOH/IOL) - supports direct driving of up to 20 LS-TTL inputs without buffering. |
| Operating Temperature | 0°C to 70°C - specifies commercial-grade thermal envelope; not rated for extended industrial or military ranges. |
| Input Thresholds | VIL = 0.8 V max, VIH = 2.0 V min - defines valid logic-low/high voltage boundaries for reliable enable and data sampling. |
Pinout & Package
SN74LS75N is housed in a 16-pin plastic dual in-line package (PDIP-N), 0.300-inch wide body, with 0.100-inch lead pitch and through-hole mounting. Pin 1 is marked by a notch or dot at the top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 5, 12 | Data Input (D) | Four independent data inputs, one per latch; sampled when corresponding G is high. |
| 2, 3, 6, 13 | Enable Input (G) | Four independent gate controls; high enables transparency, low holds latched state. |
| 7 | GND | Power ground reference for all internal circuitry and I/O. |
| 8, 9, 10, 11 | True Output (Q) | Four latched true outputs, active-high, sourcing/sinking up to ±8 mA. |
| 14, 15, 16, 1 | Complementary Output (Q̅) | Four latched inverted outputs; pin 1 serves as both Q̅ for latch 1 and pin 1 identifier. |
| 16 | VCC | +5 V power supply connection; decoupling capacitor required within 1 cm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent latches | Enables simultaneous storage of four 1-bit signals without inter-latch coupling or shared control timing. |
| Transparent latch behavior | Allows real-time data pass-through during enable assertion-critical for bus arbitration and pipeline staging. |
| LS-TTL compatible I/O | Guarantees interoperability with 74LS, 74S, and 74F families without level-shifting or current-limiting resistors. |
| DC noise margin ≥0.4 V | Provides robustness against crosstalk and ground bounce in dense PCB layouts with mixed-signal routing. |
| Through-hole PDIP packaging | Supports manual prototyping, socket-based testing, and legacy production assembly with wave soldering. |
Applications
| Microprocessor Bus Interface | Industrial Control Logic |
|---|---|
Use Scenario: Isolating address/data lines between microprocessor and peripheral devices during memory-mapped I/O cycles. IC Role / Device Role / Timing Role: SN74LS75N acts as a bidirectional transparent latch enabling time-multiplexed bus sharing without contention. Use Value: Eliminates need for dedicated bus transceivers by providing controlled signal hold during CPU wait states. |
Use Scenario: Capturing sensor status bits from parallel input modules in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: SN74LS75N stores asynchronous input transitions until scanned by the PLC scan cycle. Use Value: Provides deterministic edge capture with no metastability risk under slow-varying industrial input conditions. |
| Digital Test Equipment | Legacy Instrumentation Design |
Use Scenario: Holding test pattern bits in automated test equipment (ATE) channel drivers prior to stimulus application. IC Role / Device Role / Timing Role: SN74LS75N serves as a static pattern register synchronized to ATE master clock edges. Use Value: Delivers sub-25 ns setup/hold timing margins essential for precise vector launch timing. |
Use Scenario: Replacing obsolete 7475 latches in field-repairable avionics subsystems requiring long-term component availability. IC Role / Device Role / Timing Role: SN74LS75N provides drop-in functional replacement with identical pinout and electrical behavior. Use Value: Maintains original system timing integrity while meeting modern RoHS compliance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bistable latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS75DR | SOIC-16 package, RoHS-compliant NiPdAu finish, 260°C reflow rated, same electrical specs. | Suitable for surface-mount production; requires PCB redesign and stencil changes versus PDIP. | Select SN74LS75DR for new SMT designs where board space and automated assembly efficiency are prioritized. |
| SN54LS75J | CDIP-16 package, military temperature range (–55°C to +125°C), SnPb lead finish, non-RoHS. | Required for aerospace/defense applications demanding extended thermal reliability and MIL-PRF-38535 qualification. | Choose SN54LS75J only when full military specification compliance and extreme temperature operation are mandatory. |
Compared with SN74LS75DR and SN54LS75J, the SN74LS75N offers commercial-temperature through-hole compatibility with RoHS compliance-making it optimal for legacy upgrades, lab validation, and low-volume manufacturing where socketing and hand-soldering remain essential.
Availability
SN74LS75N is available at Aetrix Electronics and suitable for microprocessor bus interface, industrial control logic, digital test equipment, and legacy instrumentation design requiring stable component supply and long-term obsolescence mitigation.
Supply support for SN74LS75N 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 solutions with global manufacturing and quality certification.
The SN74LS75N belongs to TI's legacy 74LS logic family, designed specifically for reliable, low-power, TTL-compatible digital interfacing in commercial-grade systems from the 1970s onward.
FAQ
What is the function of the SN74LS75N in digital circuits?
The SN74LS75N functions as a quad transparent latch, allowing four independent 1-bit data signals to be held stable when their respective enable (G) inputs are low. When G is high, data passes directly from D to Q/Q̅ outputs. This behavior makes the SN74LS75N ideal for temporary data storage in bus-oriented architectures, such as microprocessor address latching or I/O port buffering, where synchronization with external timing signals is required.
Does the SN74LS75N have built-in reset or clear functionality?
No, the SN74LS75N does not include asynchronous reset or preset inputs. Each of its four latches relies solely on the enable (G) and data (D) inputs for state control. To initialize or clear outputs, external logic must force known D values while asserting G, or tie Q/Q̅ outputs to pull-up/pull-down networks. This absence distinguishes it from flip-flop variants like the SN74LS74 and confirms its role strictly as a level-sensitive latch.
Can the SN74LS75N be used in place of the original SN7475?
Yes, the SN74LS75N is a direct functional and pin-compatible upgrade to the original SN7475, offering improved speed (20 ns vs. 40 ns typical), lower power consumption, and enhanced noise immunity due to LS-TTL technology. Both share identical pinout, logic behavior, and 16-pin PDIP packaging, enabling seamless substitution in existing designs without layout or firmware changes-provided the 4.75–5.25 V supply range is maintained.
What is the maximum fan-out capability of the SN74LS75N outputs?
The SN74LS75N outputs support a guaranteed fan-out of 20 LS-TTL loads, meaning each Q or Q̅ output can reliably drive up to 20 standard LS-TTL inputs without signal degradation. This is enabled by its ±8 mA output drive strength and is validated across the full 0°C to 70°C operating range and 4.75–5.25 V supply. Exceeding this fan-out may cause timing violations or logic-level errors.
Is the SN74LS75N RoHS compliant and what is its lead finish?
Yes, the SN74LS75N is RoHS compliant and features a NiPdAu (nickel-palladium-gold) lead finish, which provides excellent solderability and corrosion resistance for lead-free reflow processes. Its PDIP package meets JEDEC standards for through-hole assembly, and the NIPDAU finish is qualified for Level-1 moisture sensitivity with unlimited floor life under dry storage conditions.
SN74LS75N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- D-Type Transparent Latch
- Circuit:
- 1:1
- Output Type:
- Differential
- Voltage - Supply:
- 4.75V ~ 5.25V
- Independent Circuits:
- 4
- Delay Time - Propagation:
- 9ns
- Current - Output High, Low:
- 400µA, 8mA
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
SN74LS75N FAQ
1.How can I place an order for SN74LS75N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS75N 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 SN74LS75N reliable?
The price and inventory of SN74LS75N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS75N is usually 5 days.
3.What payment methods are accepted for SN74LS75N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS75N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS75N?
SN74LS75N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS75N 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 SN74LS75N?
For technical support, including SN74LS75N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS75N requirements.
6.How does Aetrix verify that SN74LS75N is sourced from the original manufacturer or authorized distributors?
All SN74LS75N 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 SN74LS75N meets industry standards.
7.What is the process for return or replacement of SN74LS75N?
All SN74LS75N units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS75N, 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 SN74LS75N part is unused and in its original packaging.
Return procedure for SN74LS75N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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