HCF4017 Tech Specifications
STMicroelectronics - HCF4017 technical specifications, attributes, parameters and parts with similar specifications to STMicroelectronics - HCF4017

Product Attribute	Attribute Value
Part Number	HCF4017
Package	DAC91001
Description	DAC91001
Stock Condition	Get 7080 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 HCF4017’s operating voltage range affect its suitability for low-power battery-powered applications compared to other decade counters?: The HCF4017 operates from 3 V to 15 V, which includes common single-cell and multi-cell battery voltages such as 3.3 V and 5 V. This wide supply range allows it to interface efficiently with systems powered by lithium-ion or alkaline batteries without requiring a dedicated regulator in simple designs. However, at lower end of the range near 3 V, noise margins and propagation delays increase slightly due to reduced overdrive voltage. Engineers should verify timing requirements under minimum supply conditions when selecting this IC for portable devices.

What are the key differences between the HCF4017 and similar decade counters like the CD4017 in terms of speed and power consumption for high-frequency clock applications?: The HCF4017 is a high-speed CMOS variant optimized for performance, typically supporting up to 10 MHz clock frequencies, whereas standard CD4017 variants may be limited to 5 MHz under similar conditions. Additionally, the HCF4017 exhibits lower quiescent current at higher temperatures and better immunity to latch-up compared to earlier generations. When driving multiple outputs simultaneously or using long output traces, the HCF4017’s faster edge rates reduce glitching risk during state transitions.

Can the HCF4017 drive inductive loads directly, and what external circuitry is recommended to protect against back-EMF?: No, the HCF4017 cannot safely drive inductive loads such as relays or solenoids directly due to its CMOS output structure. A flyback diode must be placed across each inductive load connected to one of the HCF4017’s output pins. For higher reliability, especially in automotive or industrial environments, consider adding series resistors and optoisolators. In typical consumer electronics where loads are capacitive or resistive, no additional protection is needed beyond standard decoupling capacitors near VCC and GND.

What is the maximum allowable fan-out for each output pin on the HCF4017 when sourcing or sinking current?: Each output stage of the HCF4017 can source or sink up to 10 mA continuously, corresponding to a fan-out of approximately two TTL loads (1 mA per TTL load). However, cumulative loading across all 10 outputs should not exceed the total package power dissipation limit. For example, if three outputs are active simultaneously sourcing 5 mA each, the combined power draw increases significantly. Designers should avoid exceeding 30–40% duty cycle on any individual output at full current to prevent thermal stress.

How does temperature variation impact the HCF4017’s switching thresholds and reliability in industrial environments?: Over an extended temperature range (typically –40°C to +85°C), the HCF4017 maintains stable logic levels within ±10% of nominal supply voltage. Threshold voltages shift predictably with temperature, but noise margins remain adequate for most digital systems. At elevated temperatures, leakage currents increase modestly, which may affect unused inputs left floating—always tie unused inputs to VDD or GND. Thermal derating is minimal due to low static power, making the HCF4017 suitable for rugged embedded applications.

Why might a designer choose the SOP16 package over smaller footprints for the HCF4017 despite space constraints?: The SOP16 package provides superior heat dissipation and easier soldering compared to surface-mount alternatives like SOT23-6, even though the functional core remains small. Its larger lead pitch reduces assembly defects in mass production, and its thermal resistance is lower, improving long-term reliability under continuous operation. While newer ultra-small packages exist, the SOP16 offers a balance of performance, robustness, and manufacturing yield—especially valuable in prototyping and high-volume designs alike.

Is it acceptable to use the HCF4017 without a bypass capacitor if the system has a well-regulated power supply?: Although some systems operate successfully with a clean, tightly regulated supply, omitting a bypass capacitor risks instability due to transient currents during state changes. A 0.1 µF ceramic capacitor placed within 1 cm of the VCC and GND pins suppresses high-frequency noise and stabilizes internal node voltages. Even with ideal regulation, parasitic inductance in long traces can create voltage dips that disrupt CMOS logic behavior. This precaution is particularly important when the HCF4017 drives multiple capacitive loads or operates at higher clock speeds.

How does the reset functionality of the HCF4017 interact with asynchronous inputs, and what precautions are necessary during power-up?: The MR (Master Reset) input of the HCF4017 is asynchronous; asserting it forces Q0 high and all other outputs low regardless of the clock signal. To ensure predictable initialization, the MR pin should be held high until the system reaches stable operating voltage. If driven by a slow-start power rail, a pull-down resistor combined with an RC delay network can prevent spurious resets. During power-up transients, floating inputs may cause undefined states—therefore, unused pins like NC (No Connection) should be tied appropriately based on application needs.

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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

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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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HCF4017

STMicroelectronics
32D-HCF4017

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HCF4017 - 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.