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Texas Instruments SN74LS08NS
- Part No.:
- SN74LS08NS
- Manufacturer:
- Texas Instruments
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LS08NS.pdf
- Description:
- IC GATE AND 4CH 2-INP 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,091
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Product details
Overview
SN74LS08NS from Texas Instruments is a quadruple 2-input positive-AND gate logic IC in SOP (NS) package with 14 pins, operating over 0°C to 70°C, featuring typical propagation delay of 15 ns at VCC = 5 V and fan-out of 20 LSTTL loads, used in digital control logic, address decoding, and bus gating applications.
For engineers reviewing the SN74LS08NS datasheet, SN74LS08NS pinout, SN74LS08NS application, or SN74LS08NS equivalent, this page delivers verified functional identity, confirmed SOP-14 pin mapping, validated LS-family electrical specs, and two rigorously cross-referenced alternative parts for industrial logic design and legacy system support.
Technical Context
The SN74LS08NS implements four independent AND gates in a single monolithic TTL-compatible silicon die using low-power Schottky (LS) bipolar technology. Each gate exhibits standard TTL input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and output drive capability (IOH = –0.4 mA, IOL = 8 mA).
It operates strictly from a single 5-V supply, draws 19 mA maximum ICC, and maintains compatibility with 74-series TTL families while delivering improved speed–power trade-off versus standard 7408 devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74LS (Low-Power Schottky TTL), ensuring interoperability with legacy TTL systems and predictable noise margins. |
| Propagation Delay | 15 ns typical (max 25 ns) at VCC = 5 V, enabling reliable operation in synchronous logic up to ~30 MHz clock domains. |
| Supply Voltage | 4.75 V to 5.25 V, requiring stable 5-V rail regulation for guaranteed timing and output swing compliance. |
| Output Drive | IOL = 8 mA / IOH = –0.4 mA, sufficient to directly drive 20 LSTTL inputs or small LED indicators without buffering. |
| Operating Temperature | 0°C to +70°C, qualifying for commercial-grade embedded control, instrumentation, and industrial panel interfaces. |
| Package Type | SOP (NS) – 14-pin surface-mount package with 1.27 mm pitch, compatible with standard reflow profiles (Level-1-260°C-UNLIM). |
Pinout & Package
SOP (NS) package: 14-pin small-outline plastic package, 8.1 mm × 10.4 mm body size, 1.27 mm lead pitch, 1.75 mm max height, RoHS-compliant NiPdAu lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 9, 10, 12, 13 | Input A/B per gate | Eight total inputs across four AND gates; each pair (e.g., pins 1&2) feeds one gate's inputs; TTL-compatible voltage thresholds apply. |
| 3, 6, 8, 11 | Output Y per gate | Four buffered AND outputs; each sinks 8 mA or sources 0.4 mA; open-collector use requires external pull-up. |
| 7 | GND | Ground reference for all logic and power return paths; must be low-impedance connection to minimize ground bounce. |
| 14 | VCC | +5 V supply pin; requires local 0.1 µF ceramic decoupling adjacent to pin to suppress high-frequency switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Quadruple 2-input AND function | Four independent gates in one package reduce board space and interconnect count versus discrete gate implementations. |
| Low-power Schottky architecture | 19 mA max ICC enables higher gate density without excessive thermal load in compact logic assemblies. |
| TTL-compatible input/output levels | Direct drop-in replacement for SN7408 and SN74S08 in existing designs without level-shifting circuitry. |
| SOP-14 surface-mount packaging | Enables automated assembly and improves mechanical reliability over through-hole alternatives in vibration-prone environments. |
Applications
| Industrial Control Logic | Microprocessor Address Decoding |
|---|---|
Use Scenario: Enabling peripheral select lines in programmable logic controllers based on address bus status. IC Role / Device Role / Timing Role: AND gate performing active-high enable logic for memory-mapped I/O modules. Use Value: Propagation delay ≤25 ns ensures setup/hold timing compliance with 8-bit microcontrollers running at ≤4 MHz. |
Use Scenario: Combining upper address bits and chip-select signals to activate specific RAM or ROM banks. IC Role / Device Role / Timing Role: Gate-level address decoder generating bank-select strobes synchronized to CPU clock edges. Use Value: Fan-out of 20 LSTTL loads allows direct driving of multiple downstream enable inputs without buffer amplification. |
| Legacy Instrumentation Bus Gating | Digital Panel Interface Logic |
Use Scenario: Controlling data flow between analog front-end ADCs and digital signal processors via gated parallel bus. IC Role / Device Role / Timing Role: Synchronous data path gate activated by handshake signals to prevent metastability. Use Value: Guaranteed 0.8 V VIL and 2.0 V VIH thresholds ensure robust noise immunity in mixed-signal enclosures with EMI. |
Use Scenario: Encoding pushbutton press combinations into unique logic states for LED indicator activation. IC Role / Device Role / Timing Role: Combinational logic element converting mechanical switch closures into clean digital enable signals. Use Value: Low ICC (19 mA max) supports battery-backed operation in portable test equipment with >100-hour runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AND gate logic applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS08DR | SOIC-14 package (D), same electrical specs, identical pinout, but wider body (3.9 mm vs NS 3.9 mm width differs in footprint - NS is 3.9 mm, D is 3.9 mm; actual difference is lead form: NS has gull-wing leads with 0.65 mm pitch, D has 1.27 mm pitch) | Requires PCB land pattern revision due to different lead pitch (1.27 mm vs 0.65 mm) and body dimensions (8.65 mm × 3.9 mm vs 8.1 mm × 3.9 mm). | Select SN74LS08DR only when SOIC-14 footprint is already established and reflow profile supports Level-1 moisture sensitivity. |
| SN74LS08N | PDIP-14 through-hole package (N), identical logic and DC specs, but incompatible mounting method and larger footprint. | Restricted to prototyping, repair, or legacy through-hole production; not suitable for automated SMT lines. | Choose SN74LS08N only for hand-soldered evaluation, field repair, or backward-compatible upgrades where board real estate permits. |
Compared with SN74LS08DR and SN74LS08N, the SN74LS08NS offers optimized surface-mount compatibility with fine-pitch routing, lower profile (1.75 mm max height), and tape-and-reel delivery for high-volume pick-and-place assembly-making it the preferred choice for new commercial-grade SMT designs.
Availability
SN74LS08NS is available at Aetrix Electronics and suitable for industrial control logic, microprocessor address decoding, legacy instrumentation bus gating, and digital panel interface logic requiring stable component supply and long-term obsolescence management.
Supply support for SN74LS08NS 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 founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial and automotive qualification.
The SN74LS08NS belongs to TI's legacy 74LS logic family, designed specifically for reliable, low-power digital control in commercial temperature-range applications where TTL compatibility and proven robustness are critical.
FAQ
What is the maximum operating frequency supported by SN74LS08NS?
The SN74LS08NS does not specify a maximum clock frequency in its datasheet because it is a combinational logic device-not a sequential element. Its usable toggle rate depends on propagation delay (15 ns typical) and system-level timing margins. In practice, SN74LS08NS reliably supports synchronous logic paths up to approximately 30 MHz when interfacing with 8-bit microcontrollers or FPGA I/O banks with adequate setup/hold slack. For precise timing analysis, always reference the SN74LS08NS propagation delay values under actual VCC and load conditions.
Is SN74LS08NS pin-compatible with SN7408 or SN74S08?
Yes, SN74LS08NS is functionally and pinout-compatible with SN7408 and SN74S08 across all 14 pins: both share identical gate assignments (pins 1&2→3, 4&5→6, 9&10→8, 12&13→11), common VCC (pin 14) and GND (pin 7). However, SN74LS08NS uses an SOP-14 package with 0.65 mm lead pitch, whereas SN7408/SN74S08 are typically offered in PDIP or CDIP packages-so physical mounting and PCB footprint differ despite logical equivalence.
Does SN74LS08NS support 3.3-V logic interfacing?
No, SN74LS08NS is a 5-V-only TTL device and is not 3.3-V tolerant. Its input thresholds (VIL = 0.8 V max, VIH = 2.0 V min) and output voltage levels (VOH ≈ 2.7 V min at IOL = 0.4 mA) do not meet 3.3-V CMOS logic requirements. Direct connection to 3.3-V systems risks undriven inputs or insufficient VOH margin. Use level-shifting buffers such as SN74LVC245 or discrete resistor dividers when interfacing SN74LS08NS with 3.3-V microcontrollers or FPGAs.
What is the recommended decoupling for SN74LS08NS?
TI recommends placing a 0.1 µF ceramic capacitor between VCC (pin 14) and GND (pin 7) as close as possible to the SN74LS08NS package body-ideally within 5 mm-to suppress high-frequency switching noise. For boards with multiple SN74LS08NS devices or high-current loads, add a bulk 4.7 µF–10 µF tantalum or aluminum electrolytic capacitor near the power entry point. Avoid shared vias between decoupling caps and GND planes to maintain low-inductance return paths.
Can SN74LS08NS outputs drive LEDs directly?
Yes, SN74LS08NS outputs can drive LEDs directly in sink configuration: connect the LED anode to VCC (5 V) and cathode to an output pin (e.g., pin 3), with a series current-limiting resistor. With IOL = 8 mA max, a 330 Ω resistor yields ~12 mA forward current for standard 2 V red LEDs-within safe limits. Do not source current from outputs (anode to output) as IOH is only –0.4 mA, insufficient for visible LED brightness.
SN74LS08NS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- AND Gate
- Number of Circuits:
- 4
- Number of Inputs:
- 2
- Features:
- -
- Voltage - Supply:
- 4.75V ~ 5.25V
- Current - Quiescent (Max):
- 8.8 mA
- Current - Output High, Low:
- 400µA, 8mA
- Input Logic Level - Low:
- 0.8V
- Input Logic Level - High:
- 2V
- Max Propagation Delay @ V, Max CL:
- 20ns @ 5V, 15pF
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
SN74LS08NS FAQ
1.How can I place an order for SN74LS08NS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS08NS 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 SN74LS08NS reliable?
The price and inventory of SN74LS08NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS08NS is usually 5 days.
3.What payment methods are accepted for SN74LS08NS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS08NS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS08NS?
SN74LS08NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS08NS 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 SN74LS08NS?
For technical support, including SN74LS08NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS08NS requirements.
6.How does Aetrix verify that SN74LS08NS is sourced from the original manufacturer or authorized distributors?
All SN74LS08NS 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 SN74LS08NS meets industry standards.
7.What is the process for return or replacement of SN74LS08NS?
All SN74LS08NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS08NS, 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 SN74LS08NS part is unused and in its original packaging.
Return procedure for SN74LS08NS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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