HCF4017BMTR Tech Specifications
STMicroelectronics - HCF4017BMTR technical specifications, attributes, parameters and parts with similar specifications to STMicroelectronics - HCF4017BMTR

Product Attribute	Attribute Value
Part Number	HCF4017BMTR
Package	DAC91001
Description	DAC91001
Stock Condition	Get 16400 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)

What is the recommended operating voltage range for the HCF4017BMTR, and how does this impact its compatibility with common logic levels in digital systems?: The HCF4017BMTR is a CMOS 10-stage Johnson counter that operates within a supply voltage range of 3 V to 15 V, as specified in its electrical characteristics. This wide input range allows it to interface directly with both 3.3 V and 5 V logic families without level-shifting circuitry, making it suitable for mixed-voltage system designs. However, noise margins vary significantly across this range—at 3 V, high-level inputs must exceed 2.1 V, while at 15 V, they must exceed 10.5 V. Engineers should verify signal integrity under actual operating conditions, especially in noisy environments or when driving long traces.

How does the propagation delay of the HCF4017BMTR compare between low-to-high and high-to-low transitions, and what are the implications for timing-sensitive applications?: According to typical performance data, the HCF4017BMTR exhibits an asymmetric propagation delay: tPLH (low-to-high) is approximately 60 ns at 9 V and 25°C, whereas tPHL (high-to-low) is around 80 ns under the same conditions. This difference arises from the internal transistor structures in CMOS logic. For synchronous designs requiring precise clock-to-output timing, such as LED ring counters or frequency dividers, this asymmetry may necessitate careful layout and buffer insertion to maintain signal coherence across multiple stages.

Can the HCF4017BMTR drive multiple load stages simultaneously without degrading output performance, and what limits its fan-out capability?: The HCF4017BMTR has a maximum output current of ±10 mA per pin, which supports moderate fan-out. While it can drive several standard TTL inputs or low-capacitance CMOS gates, cascading more than three to four loads may require external buffering due to increased propagation delay and risk of signal degradation. Additionally, capacitive loading beyond 50 pF can extend rise/fall times significantly. In practice, designers often use a single buffer stage after the HCF4017BMTR when interfacing with memory chips or high-speed peripherals.

Is the HCF4017BMTR suitable for use in automotive temperature environments, and how do its reliability metrics support harsh condition deployment?: Although not explicitly qualified to AEC-Q100, the HCF4017BMTR benefits from ST’s robust CMOS manufacturing process, which typically offers extended temperature operation up to +125°C. Its immunity to latch-up and ESD protection (HBM >2 kV) enhance robustness in industrial and transportation applications. However, full automotive certification would require additional validation testing. For mission-critical systems, engineers should consider alternative devices with explicit automotive-grade ratings unless environmental controls ensure operation within -40°C to +85°C.

What precautions should be taken during PCB layout when using the HCF4017BMTR in high-frequency switching applications to minimize EMI and crosstalk?: Due to its internal switching behavior and potential for glitches during state transitions, the HCF4017BMTR generates transient currents that can couple into adjacent traces. To mitigate EMI, place decoupling capacitors (100 nF ceramic) as close as possible to the VDD and GND pins. Route power and ground planes on inner layers and avoid routing sensitive signals near output lines. Grounding the exposed pad on the SOT-23-6 package improves thermal dissipation and reduces ground bounce. These practices help maintain signal integrity, particularly in systems where the HCF4017BMTR drives LEDs or relays at frequencies above 1 kHz.

How does the reset function of the HCF4017BMTR behave when released asynchronously, and what design considerations prevent unintended resets during power-up?: The reset pin (RST) forces all outputs low when asserted high, regardless of the clock signal. Upon release, the device resumes counting from output Q0 only if the clock input (CP0) has a rising edge immediately after reset deassertion. Without this edge, the counter may start from an undefined state. To ensure predictable initialization, many designs apply a capacitor from RST to ground with a series resistor, creating a power-on reset pulse that guarantees a valid clock edge. This technique avoids race conditions during startup and ensures consistent behavior across power cycles.

What is the maximum allowable clock frequency for reliable operation of the HCF4017BMTR, and how does temperature affect this limit?: The HCF4017BMTR specifies a maximum clock frequency of 10 MHz at 25°C and 9 V supply. However, this decreases by approximately 1.2% per °C increase in temperature due to rising threshold voltages and falling carrier mobility. At 85°C, reliable operation typically caps around 7.5 MHz. For stable high-speed counting, designers should derate the clock frequency based on expected ambient temperatures. Additionally, using shorter trace lengths and minimizing capacitive loading helps preserve timing margins in time-constrained applications.

In comparison to the CD4017, how does the HCF4017BMTR improve performance in low-power embedded systems, and what trade-offs exist?: The HCF4017BMTR offers lower quiescent current (typically <0.1 µA) compared to older CD4017 variants (>1 µA), thanks to ST’s advanced CMOS technology. It also provides better noise immunity and wider supply tolerance (3–15 V vs. 5 V nominal). However, the HCF4017BMTR lacks some of the legacy CD4017’s built-in carry-out functionality, requiring external logic for decade-based sequencing. When selecting between parts, engineers must weigh ultra-low power needs against integration simplicity, especially in battery-powered devices where static consumption dominates total energy budget.

Can the HCF4017BMTR be used in oscillator circuits, and if so, what external components are required to generate a stable clock signal?: Yes, the HCF4017BMTR can serve as part of a relaxation oscillator circuit. By connecting CP0 to a timing network consisting of a resistor (e.g., 10 kΩ) and capacitor (e.g., 10 nF), and grounding CP1, the device oscillates at approximately f = 1/(2RC·ln(1 + 2R/Rin)), where Rin is the input resistance (~1 MΩ). With the given values, this yields ~1.4 kHz. Stability depends on component tolerances and power supply ripple, so precision applications may require calibration or alternative clock sources. This method is useful for simple LED sequencers but less accurate than crystal-based clocks.

How should unused inputs on the HCF4017BMTR be handled to prevent erratic behavior or excessive power draw?: Unused inputs—specifically CP1 and the carry-out enable pin—must not be left floating. CP1 should be tied to ground to disable clock input buffering and reduce leakage. The carry-out enable (CE) pin should connect to VDD to allow normal counting; leaving it floating can cause unpredictable oscillation due to capacitive coupling. Proper termination minimizes standby current and ensures deterministic state transitions. These practices are critical in multi-device systems where shared buses or parasitic capacitance could otherwise trigger false triggers.

What is the significance of the "UP" designation in the HCF4017BMTR model number, and how does it affect counting direction control?: The "UP" suffix indicates that the device counts upward from Q0 through Q9 upon each rising edge of the clock at CP0 when the UP/DOWN mode is set for forward operation. Unlike bidirectional counters, the HCF4017BMTR does not inherently support reverse counting without external inversion logic. To implement decrementing sequences, users must invert the clock signal or use feedback from a specific output to gate the clock path. This simplifies hardware but restricts native bidirectional operation, which must be accounted for in sequence-driven designs like rotary encoders or display controllers.

How does the output impedance of the HCF4017BMTR change with supply voltage, and what impact does this have on driving resistive loads?: Output impedance decreases slightly as supply voltage increases due to stronger pull-up/pull-down transistor conduction. At 3 V, effective ON-resistance is higher (~200 Ω), increasing voltage drop across resistive loads like LEDs without current-limiting resistors. For a red LED (Vf ≈ 2 V) driven at 3 V supply, the HCF4017BMTR alone cannot provide sufficient headroom; a series resistor (e.g., 100 Ω) is essential. At 15 V, the same configuration yields higher brightness but demands attention to power dissipation and thermal management.

In comparison to FPGA-based state machines, when might the HCF4017BMTR still offer advantages in cost-sensitive, low-complexity designs?: The HCF4017BMTR delivers deterministic timing, zero firmware overhead, and minimal BOM cost in simple sequencing tasks like 10-step LED animations or relay control loops. Unlike FPGAs, it consumes microamps of static power and requires no programming or configuration. For applications where cycle accuracy and instant response outweigh flexibility, such as consumer toys or test fixtures, the HCF4017BMTR provides a reliable, low-risk solution. However, complex state logic or dynamic reconfiguration favors programmable alternatives despite higher complexity and power draw.

What role does the carry-out (CO) pin play in cascading multiple HCF4017BMTRs for extended counting sequences?: The CO pin goes high when Q9 activates, providing a pulse that can trigger the next stage in a cascade. However, this signal is not synchronized to the main clock and may exhibit glitches during state transitions. To ensure clean propagation, designers often buffer the CO signal before feeding it to the next HCF4017BMTR’s clock input. Alternatively, using a dedicated carry-out enable (CE) pin to gate the next clock allows more reliable multi-decade operation. Cascading beyond two or three stages introduces cumulative jitter, limiting practical length to four or five decades in most designs.

How does substrate noise coupling affect the HCF4017BMTR in densely populated PCBs, and what layout strategies reduce its impact?: As a monolithic CMOS device, the HCF4017BMTR is susceptible to substrate noise generated by nearby switching regulators or high-current drivers. This can manifest as transient shifts in output states or false clock edges. Effective mitigation includes placing the IC away from noisy components, using a solid ground plane, and isolating analog and digital sections with guard rings. Additionally, adding ferrite beads or RC filters on clock lines reduces susceptibility to electromagnetic interference. These measures are particularly important in mixed-signal systems where timing integrity is paramount.

Can the HCF4017BMTR be safely powered through its I/O pins instead of the dedicated VDD pin, and what risks does this pose?: No, powering the HCF4017BMTR via any I/O pin is strongly discouraged. Internal ESD protection diodes clamp off-chip power to the substrate, potentially causing reverse current flow into non-powered pins. This can lead to latch-up, degraded performance, or permanent damage if the I/O voltage exceeds the intended supply rail. Always connect VDD directly to the regulated power source with adequate bypassing. Miswiring during prototyping has caused field failures in industrial control units, underscoring the need for strict adherence to pinout specifications.

What is the typical start-up time for the HCF4017BMTR after power application, and how does this influence initialization routines in microcontroller co-designs?: The HCF4017BMTR begins responding to clock edges within 1 µs after stable power is applied, assuming clean ramp-up. However, internal bias circuits take longer to stabilize fully—up to 10 µs in marginal conditions. Microcontrollers initializing peripherals should delay enabling the clock until VDD exceeds 90% of target value. Failure to wait may result in missed pulses or incorrect initial states. This subtle timing consideration is often overlooked in fast-boot systems but critical for repeatable operation across production batches.

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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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HCF4017BMTR

STMicroelectronics
32D-HCF4017BMTR

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HCF4017BMTR - 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.