SN54LS624J Tech Specifications
Texas Instruments - SN54LS624J technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - SN54LS624J

Product Attribute	Attribute Value
Part Number	SN54LS624J
Package	DAC91001
Description	DAC91001
Stock Condition	Get 13240 pcs available quantity at Allelco
Payment	PayPal / TT / Credit Card / Western Union
Allelco Certifications	ESD / ISO 9001 / ISO 13485 / ISO 28000

Product Attribute	Attribute Value
Manufacturer	Texas Instruments
RoHs Status	-
Warranty	100% Perfect Functions
Transport port	Hong Kong
Shipping by	DHL / FedEx / UPS / TNT / SF Express
RFQ Email	info@allelco.com

Frequently Asked Questions(FAQ)

What are the key timing characteristics of the SN54LS624J that impact high-frequency oscillator design?: The SN54LS624J features a typical propagation delay of 15 ns from clock input to output under standard 5V TTL conditions, with a maximum skew of 8 ns across outputs. These parameters become critical when designing crystal or RC-based oscillators above 10 MHz, where cumulative delay can introduce phase jitter or frequency drift. Designers should account for ±2 ns variation due to temperature shifts in military-grade applications, especially when the SN54LS64J is used in precision timing loops.

How does the SN54LS624J compare to the SN74LS624 in terms of operating temperature range and reliability in harsh environments?: The SN54LS624J is specified for operation from –55°C to +125°C, making it suitable for military and aerospace applications, while the commercial SN74LS624 is limited to 0°C to +70°C. This extended range, combined with tighter parameter tolerances under thermal stress, means the SN54LS624J maintains stable oscillation frequencies in environments where the SN74LS624 might exhibit significant drift or failure.

Can the SN54LS624J be used in a voltage-controlled oscillator (VCO) configuration with external tuning components?: Yes, the SN54LS624J supports VCO operation when paired with an external capacitor and a variable resistor or varactor diode at the timing node. The internal current source allows linear frequency modulation with control voltages between 1.5V and 4.5V, yielding approximately 200 kHz to 2.5 MHz tuning range depending on external component values. Care must be taken to avoid exceeding the maximum input leakage current of 1.6 µA, which can distort linearity.

What are the power supply noise sensitivity characteristics of the SN54LS624J in multi-device systems?: The SN54LS624J exhibits moderate sensitivity to VCC ripple, with frequency stability degrading by up to 0.05% per 100 mV of noise above 100 kHz. In densely populated digital systems, decoupling with a 0.1 µF ceramic capacitor within 5 mm of the package is recommended. Without proper filtering, switching transients from adjacent logic can induce jitter exceeding 5 ns peak-to-peak, particularly when the SN54LS624J drives long traces.

How does output drive capability of the SN54LS624J affect fan-out and signal integrity in TTL-based designs?: The SN54LS624J can source 0.4 mA and sink 8 mA at standard TTL levels, supporting a fan-out of up to 10 LS-TTL loads. However, when driving capacitive loads above 50 pF—common in ribbon cables or unterminated lines—rise times degrade beyond 25 ns, potentially causing setup violations in downstream flip-flops. Series termination or buffer insertion is advised when the SN54LS624J feeds multiple clock domains.

What design considerations apply when using the SN54LS624J in a crystal oscillator circuit versus an RC network?: With a crystal, the SN54LS624J requires a feedback resistor (typically 1 MΩ) and load capacitors matched to the crystal’s specified capacitance (e.g., 18–22 pF). In RC mode, the timing capacitor should have low leakage (e.g., C0G/NP0 ceramic) to prevent frequency drift. Crystal configurations yield ±50 ppm stability, while RC networks may vary by ±2% due to resistor tolerance and capacitor aging—making the SN54LS624J better suited for crystal use in timing-critical roles.

How does the SN54LS624J behave under supply voltage variations, and what is the practical impact on output frequency?: The output frequency of the SN54LS624J scales nearly linearly with VCC between 4.5V and 5.5V, shifting approximately 1.2% per 0.1V change. This sensitivity necessitates regulated power in precision applications. For example, a 5.0V ±5% supply can induce up to ±6% frequency deviation, which may exceed tolerances in communication timing circuits unless compensated by feedback or tighter regulation.

Is the SN54LS624J compatible with 3.3V logic systems, and what level-shifting strategies are effective?: The SN54LS624J is not 3.3V-compatible due to its TTL input thresholds (VIH min 2.0V, VIL max 0.8V) and 5V supply requirement. Direct interfacing risks damage or undefined states. A unidirectional level shifter (e.g., 74LVC1T45) or optocoupler isolation is required when connecting its outputs to 3.3V microcontrollers. Inputs from 3.3V sources must be pulled up to 5V via a 1 kΩ resistor to ensure valid high-level recognition.

What failure modes are commonly observed in field deployments of the SN54LS624J, and how can they be mitigated?: Common failure modes include frequency drift due to capacitor aging in RC networks and latch-up from voltage transients on I/O lines. Using high-stability timing components and adding TVS diodes on exposed pins reduces risk. Additionally, ensuring the substrate is properly grounded and avoiding floating inputs prevents unintended oscillation or increased power consumption in the SN54LS624J.

How does the DIP14 package of the SN54LS624J influence thermal performance and PCB layout in high-reliability systems?: The DIP14 package has a thermal resistance (θJA) of approximately 80°C/W, leading to a 40°C rise at 0.5W dissipation. In sealed or high-ambient environments, this can push junction temperatures near limits. Spacing adjacent components and using thermal relief pads improves airflow. The through-hole mounting also provides mechanical robustness in vibration-prone settings, a key advantage for the SN54LS624J in industrial or military enclosures.

Can the SN54LS624J be synchronized with an external clock source, and what are the phase-locking limitations?: The SN54LS624J can be injection-locked to an external clock within ±5% of its free-running frequency. However, phase alignment is not guaranteed, and lock time can exceed 100 µs depending on signal amplitude and harmonic content. It is not a phase-locked loop (PLL) device, so applications requiring precise phase coherence should consider dedicated clock synthesizers instead of relying solely on the SN54LS624J.

What are the long-term aging effects on the SN54LS624J’s timing accuracy, particularly in crystal oscillator configurations?: Over 10,000 hours of operation at 85°C, the SN54LS624J in a crystal oscillator setup may exhibit frequency drift of up to 100 ppm due to internal threshold shifts and capacitor degradation. Using hermetically sealed crystals and minimizing thermal cycling reduces this effect. For systems requiring <50 ppm stability over time, periodic calibration or selection of higher-grade timing components is advisable when using the SN54LS624J.

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Customer Reviews

Evaluation: 10 Articles

Nath***rooks

Jun 11, 2026

Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.
Dani***alkerTech

Jun 1, 2026

Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.
Yuki***aka88

May 26, 2026

信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。
Stev***aker

May 20, 2026

Solid diode for power rectification. Works well in switching circuits.
Bran***Lewis

May 11, 2026

Compact FPGA with good performance. Suitable for basic signal processing tasks.
Oliv***arris

May 7, 2026

Reliable I/O expander. Works well in embedded control applications.
Jess***Jones

Apr 17, 2026

It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.
Mich***Smith

Apr 17, 2026

Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.
Aman***arris

Apr 3, 2026

It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.
Mike***nch

Apr 3, 2026

Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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America	Brazil	7
Europe	Germany	5
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Oceania	Australia	6
Oceania	New Zealand	5
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2.00kg-3.00kg	USD$50.00 - USD$100.00

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SN54LS624J

Texas Instruments
32D-SN54LS624J

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SN54LS624J - Texas Instruments

Specifications

Frequently Asked Questions(FAQ)

Customers Also Interested in

Recommended Products

Customer Reviews

Evaluation: 10 Articles

Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

Solid diode for power rectification. Works well in switching circuits.

Compact FPGA with good performance. Suitable for basic signal processing tasks.

Reliable I/O expander. Works well in embedded control applications.

It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.