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HomeProductsIntegrated Circuits (ICs)Logic - Gates and InvertersSN74LS24AD
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SN74LS24AD - Texas Instruments

Manufacturer Part Number
SN74LS24AD
Manufacturer
Texas Instruments
Allelco Part Number
98D-SN74LS24AD
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
42,462 pcs available, New & Original
Parts Description
NAND GATE, LS SERIES TTL
Package
Bulk
Data sheet
SN74LS24AD.pdf

Datasheets

Datasheet.pdf

HTML Datasheet

Datasheet.pdf
RoHs Status
 
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Our certification
In stock: 42462
  • Unit Price: $1.14
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $1.14 $1.14
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

SN74LS24AD Tech Specifications
Texas Instruments - SN74LS24AD technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - SN74LS24AD

Product Attribute Attribute Value
Manufacturer Texas Instruments
Series *
Product Attribute Attribute Value
Package Bulk
Base Product Number 74LS24

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status RoHS non-compliant
Moisture Sensitivity Level (MSL) 3 (168 Hours)
REACH Status REACH Affected
ECCN EAR99
HTSUS 8542.39.0001

Frequently Asked Questions(FAQ)

How does the SN74LS24AD compare to other 74LS24 variants in terms of packaging and environmental compliance for industrial applications?
The SN74LS24AD is available in bulk packaging, which supports inventory strategies for high-volume production but requires careful handling to prevent moisture-induced failures. Unlike some modern variants that meet RoHS standards, this device is RoHS non-compliant due to lead content, making it unsuitable for lead-free assembly processes without additional mitigation steps. For industrial environments where long-term reliability under thermal cycling is critical, engineers must weigh the benefits of proven performance against regulatory constraints when selecting between compliant alternatives.
What are the key timing considerations when integrating the SN74LS24AD into a synchronous digital system operating at 5 MHz?
At 5 MHz operation, the propagation delay through the SN74LS24AD’s NAND gates—typically around 15 ns under standard conditions—must be factored into clock-to-output skew calculations. With a maximum delay variation of ±3 ns across temperature (0°C to 70°C), designers should ensure setup and hold margins exceed these delays relative to the clock edge. This becomes especially important in cascaded logic stages where cumulative delays could violate timing budgets, potentially leading to race conditions or metastability if not properly managed through pipeline staging or clock domain synchronization techniques.
Can the SN74LS24AD safely drive capacitive loads typical of LED arrays or long PCB traces without external buffering?
The SN74LS24AD has limited output current capability—typically ±8 mA per pin—and moderate output impedance, which restricts its ability to drive heavy capacitive loads directly. Driving LEDs with forward currents above 10 mA or traces exceeding 10 cm may result in excessive rise/fall times and degraded noise margins due to RC time constants. In such cases, adding a buffer stage using a higher-drive device like the SN74LVC07A is recommended to maintain signal integrity and ensure reliable switching behavior under real-world load conditions.
Why might a designer choose the SN74LS24AD over newer CMOS equivalents like the SN74HC240 despite lower power efficiency?
The SN74LS24AD offers TTL-compatible inputs with defined high/low threshold voltages (typically VIL ≤ 0.8 V and VIH ≥ 2.0 V at 5 V supply), which simplifies interfacing with legacy systems still using bipolar logic families. While its static power consumption (~1.6 mW per gate) is higher than CMOS counterparts, it delivers faster propagation speeds in mixed-voltage environments where signal levels must align precisely with existing TTL infrastructure. This makes it preferable in retrofit designs or legacy platforms where compatibility outweighs power savings.
What impact does moisture sensitivity have on storage and handling of the SN74LS24AD in humid climates?
Classified as MSL 3 (168 hours), the SN74LS24AD begins to degrade once exposed beyond 168 hours above the floor life limit (typically ≤30% RH). In tropical or coastal regions with high ambient humidity, unopened packages should be stored in dry cabinets with desiccants to avoid delamination or electrochemical migration during reflow soldering. If exposure exceeds the threshold, a baking step before assembly—typically 125°C for 24 hours—is required to remove absorbed moisture and prevent popcorning defects.
How does the fan-out specification of the SN74LS24AD affect its use in bus-oriented architectures?
The SN74LS24AD supports a fan-out of up to four LS-TTL loads per output, meaning each gate can reliably drive inputs from four other similar devices without degradation. In bus structures where multiple receivers share a single line, this limits total loading unless buffered. For example, driving eight receivers would require an external tristate buffer, as exceeding fan-out degrades rise/fall times and increases susceptibility to noise coupling through shared impedances.
Is the SN74LS24AD suitable for automotive-grade temperature ranges (-40°C to +125°C) without derating?
No. The SN74LS24AD is rated for commercial temperatures only (0°C to 70°C). Operating it outside this range, particularly at elevated temperatures near 125°C, risks parametric drift—such as increased leakage currents and reduced noise margins—that compromise functionality in harsh environments. Automotive applications demand devices qualified to AEC-Q100 Grade 2 or higher; substituting the SN74LS24AD in such contexts violates reliability standards and voids warranty claims.
What trade-offs exist between speed, power, and voltage levels when replacing the SN74LS24AD with a modern LVTTL variant?
Replacing the SN74LS24AD with a low-voltage TTL part like the SN74LV240 involves balancing several factors: while LVTTL operates efficiently at 3.3 V and consumes less static power, its input thresholds are tighter (±0.4 V around mid-supply), requiring careful level translation if interfacing with 5 V logic. Additionally, LVTTL propagation delays are often slightly longer (~20–30 ns vs. ~15 ns for LS-TTL), which may affect timing margins in high-frequency paths. The choice hinges on whether voltage scaling justifies marginal speed penalties in the target application.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments SN74LS24AD

Product Attribute SN74LS24AD SN74LS24AN SN74LS24N SN74LS251N
Part Number SN74LS24AD SN74LS24AN SN74LS24N SN74LS251N
Manufacturer Texas Instruments Texas Instruments Texas Instruments Texas Instruments
Series * * - 74LS
Base Product Number 74LS24 74LS24 - 74LS251
Package Bulk Bulk - Tube

SN74LS24AD Datasheet PDF

Download SN74LS24AD pdf datasheets and Texas Instruments documentation for SN74LS24AD - Texas Instruments.

Datasheets
Datasheet.pdf
HTML Datasheet
Datasheet.pdf

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Customer Reviews

Evaluation: 10 Articles

  • ECUb***h
    Sep 22, 2026

    Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.

  • RS48***ieldTech
    Sep 16, 2026

    Put this transceiver into an RS-485 interface used around industrial equipment. Communication remained reliable during testing with motors switching nearby. Good result for the replacement board.

  • Logi***b_Chris
    Sep 8, 2026

    Purchased for a Cyclone III development project. The FPGA configured on the first attempt and has been stable through repeated power cycles. No problems with the I/O we are using.

  • Circ***FixerTom
    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
    Aug 31, 2026

    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
    Aug 20, 2026

    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
    Aug 17, 2026

    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

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  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
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Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


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SN74LS24AD Image

SN74LS24AD

Texas Instruments
98D-SN74LS24AD

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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