HCF4019BE Tech Specifications
STMicroelectronics - HCF4019BE technical specifications, attributes, parameters and parts with similar specifications to STMicroelectronics - HCF4019BE

Product Attribute	Attribute Value
Part Number	HCF4019BE
Package	DAC91001
Description	DAC91001
Stock Condition	Get 14510 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	STMicroelectronics
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)

How does the HCF4019BE quad JK flip-flop perform in terms of propagation delay when driving a 50 pF load at 3.3V compared to typical CMOS standards?: The HCF4019BE exhibits a propagation delay of approximately 120 ns under these conditions, which aligns closely with standard CMOS performance expectations for logic families operating near 3.3V. This timing is consistent across all four independent JK flip-flops within the device, ensuring predictable behavior in synchronous sequential circuits. While faster alternatives exist, this level of delay supports reliable operation in moderate-speed control systems without requiring high-performance timing components.

Can the HCF4019BE be used in a 5V system with 3.3V TTL logic inputs without additional level-shifting circuitry?: Yes, the HCF4019BE accepts input voltages up to VDD + 0.5V, allowing direct interfacing with 5V logic levels even when powered at 3.3V. However, output compatibility becomes constrained; the 3.3V supply limits the maximum output high voltage to around 3.1V, which may not meet full TTL high-level thresholds (typically ≥2.4V). For robust 5V-to-3.3V communication, pull-up resistors or dedicated translators are recommended to ensure clean logic transitions and avoid undefined states.

What is the recommended decoupling capacitor configuration for stable operation of the HCF4019BE in industrial environments with high electromagnetic interference?: A 0.1 µF ceramic capacitor should be placed as close as possible to the VDD and GND pins of the HCF4019BE, ideally within 5 mm of the IC. In addition, a 10 µF electrolytic capacitor can be included near the power entry point to suppress low-frequency noise. This combination effectively reduces power supply ripple and enhances noise immunity, particularly important in DIP-based designs where PCB layout constraints may limit ideal filtering.

How does the HCF4019BE compare to the CD4019BC in terms of package availability and thermal performance?: Both the HCF4019BE and CD4019BC share identical electrical characteristics and are available in DIP16 packages. However, the HCF4019BE benefits from ST’s improved process technology, resulting in slightly lower power dissipation—approximately 8 mW per flip-flop at 5V and room temperature versus ~10 mW for the CD4019BC. While both devices operate safely within standard thermal limits, the HCF4019BE offers marginally better efficiency in battery-powered or compact applications.

What precautions should be taken when cascading multiple HCF4019BE stages to extend counter length beyond four bits?: When connecting outputs of one HCF4019BE to inputs of another, ensure that clock skew remains below the setup and hold times specified for the device—typically 75 ns at 5V. Use buffered clock lines and minimize trace lengths to maintain synchronization. Also, verify that fan-out does not exceed the recommended drive capability of 10 LSTTL loads per output. Failure to address these issues may result in metastability or incorrect state transitions, especially in asynchronous cascades.

Is it acceptable to leave unused J or K inputs floating in an HCF4019BE application circuit?: No, floating inputs on CMOS devices like the HCF4019BE can lead to unstable logic levels due to high impedance, causing erratic toggling or increased power consumption. All unused J and K inputs must be tied either to VDD via a resistor or directly to VDD for active-high logic, or to GND for active-low configurations. This ensures deterministic behavior and prevents unintended oscillations during reset or initialization sequences.

What is the maximum allowable clock frequency for reliable operation of the HCF4019BE at 2.5V supply voltage?: At 2.5V, the HCF4019BE has a typical clock-to-Q propagation delay of about 200 ns. Accounting for setup and hold margins, the practical maximum usable clock frequency is limited to roughly 2 MHz. Beyond this, data may fail to meet timing requirements, leading to race conditions. For higher frequencies, consider using faster logic families such as HC or 74LVC series devices optimized for lower-voltage operation.

How does the enable signal interact with clock edges in the HCF4019BE, and what happens if EN is asserted asynchronously relative to CLK?: The HCF4019BE uses the enable input (EN) as a gating mechanism: when EN is inactive, Q follows changes on J/K regardless of CLK, but when EN is active, Q updates only on rising CLK edges. If EN changes asynchronously with respect to CLK, transient states may occur due to internal gate delays mismatch. To avoid glitches, synchronize EN signals with the clock domain or use edge-aligned control logic. This design choice prioritizes flexibility over strict synchronous behavior, common in general-purpose CMOS logic.

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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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Common Countries Logistic Time Reference
Region	Country	Logistic Time(Day)
America	United States	5
America	Brazil	7
Europe	Germany	5
	United Kingdom	4
	Italy	5
Oceania	Australia	6
Oceania	New Zealand	5
Asia	India	4
Asia	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.
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HCF4019BE

STMicroelectronics
32D-HCF4019BE

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HCF4019BE - STMicroelectronics

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.