HCF40174BE Tech Specifications
STMicroelectronics - HCF40174BE technical specifications, attributes, parameters and parts with similar specifications to STMicroelectronics - HCF40174BE

Product Attribute	Attribute Value
Part Number	HCF40174BE
Package	DAC91001
Description	DAC91001
Stock Condition	Get 8800 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 typical operating voltage range for the HCF40174BE, and how does this impact power supply design in low-voltage embedded systems?: The HCF40174BE operates within a supply voltage range of 3 V to 15 V, making it suitable for both battery-powered and industrial applications. This wide range allows flexibility in system design but requires careful regulation when interfacing with sensors or microcontrollers that may operate at lower voltages such as 1.8 V or 2.5 V. Designers must ensure that any downstream circuitry is compatible with the output logic levels at the minimum operating voltage, as threshold voltages scale with supply.

How should the HCF40174BE be initialized during system startup, and what are the consequences of an undefined reset condition?: The HCF40174BE lacks an explicit master reset pin, so initialization relies on power-up sequencing and initial state assumptions. In practice, the first clock edge after power-on will latch into an indeterminate state, potentially causing unpredictable output behavior. To mitigate this, designers often apply a known logic level to the enable inputs (e.g., S1 and S2 tied high) and use an external RC circuit to delay the first clock edge slightly, allowing internal nodes to stabilize before counting begins.

Can the HCF40174BE be used in parallel to increase output drive capability, and what timing considerations apply?: Yes, multiple HCF40174BE devices can be paralleled for higher current sourcing or sinking requirements, provided their outputs are not simultaneously driven to conflicting states—this applies especially in ring counter configurations. However, clock signals must be routed with matched trace lengths to prevent skew-induced race conditions. A worst-case propagation delay of approximately 100 ns at 15 V supply implies that clock-to-output timing mismatches exceeding this value could corrupt the sequence.

How does temperature affect the maximum clock frequency of the HCF40174BE, and what margin should be applied in automotive or industrial environments?: The HCF40174BE is specified for operation from -40°C to +85°C, with typical propagation delays increasing by about 30–50% over the full temperature range compared to room temperature. At elevated temperatures, the maximum usable clock frequency decreases significantly; for example, at 85°C and VDD = 15 V, reliable operation may require derating from a nominal 10 MHz down to 6–7 MHz. Designers should simulate or test corner cases to confirm timing integrity under thermal stress.

What is the recommended method for cascading multiple HCF40174BE stages without introducing sequence errors?: Cascading can be achieved using the carry-out (CO) pin of one stage to trigger the clock input of the next. To avoid glitches, the CO signal should only transition when the previous stage has stabilized, typically after the last valid output is active. A common approach is to use the Q9 output as the clock source for the next stage, ensuring a clean edge. However, due to propagation delays (tens of nanoseconds), inter-stage delays may accumulate, so total cycle time increases with each stage, limiting maximum repetition rates in long chains.

How do the input leakage currents of the HCF40174BE compare between CMOS and TTL logic families, and why does this matter for fanout?: As a CMOS device, the HCF40174BE exhibits extremely low input leakage current (typically < 1 nA), which results in negligible loading even when driving multiple gates. This contrasts sharply with TTL inputs, which draw significant current and degrade signal integrity. Consequently, the HCF40174BE can safely drive up to 50 similar CMOS loads without buffering, whereas driving TTL devices would require additional interface circuitry like buffers or level translators.

What precautions are necessary when using the HCF40174BE near noise-sensitive analog circuits?: Although the HCF40174BE is inherently immune to most electromagnetic interference due to its CMOS construction, switching transients on digital lines can couple into adjacent traces via capacitive or inductive paths. It is advisable to maintain a minimum spacing of 2 mm between high-speed digital nets and analog signals, use ground planes beneath sensitive sections, and decouple VDD with 100 nF ceramic capacitors placed within 5 mm of the package leads. Additionally, unused inputs should be tied to a defined logic level rather than left floating to prevent oscillation.

Is it safe to leave unused outputs of the HCF40174BE unconnected, and how does this affect power consumption?: Unused outputs can remain open without risk of damage, but leaving them undriven may result in floating voltages that fluctuate due to stray capacitance and EMI pickup. While this does not cause functional failure, it increases dynamic power dissipation slightly due to charging/discharging effects. For lowest standby current, unused outputs should either be pulled to VDD or GND through high-value resistors (~10 kΩ), though this adds complexity. Alternatively, tying them to a fixed logic level via Schottky diodes or active pull-ups offers better noise immunity with minimal leakage impact.

How does the HCF40174BE handle ESD events compared to newer SiGe-based alternatives, and what protection measures are essential?: The HCF40174BE provides basic human-body model (HBM) ESD protection of ±2 kV, which meets general industrial standards but falls short of modern automotive requirements (±8 kV). In environments with high static risk—such as assembly floors or unshielded sensor networks—external transient voltage suppressors (TVS) diodes on VDD and I/O lines are strongly recommended. Unlike newer integrated solutions with built-in clamp diodes, the HCF40174BE relies solely on internal structures, necessitating careful PCB layout with short ground return paths.

What is the impact of VDD ramp rate on start-up reliability of the HCF40174BE, and how should power sequencing be managed?: The HCF40174BE tolerates slow VDD ramp rates from 0 V up to 15 V, but excessively fast transitions (> 100 V/μs) may cause internal latch-up if substrate coupling occurs during turn-on. Conversely, very slow ramps (< 0.1 V/ms) can lead to undefined states due to incomplete initialization. For robust operation, a controlled ramp using an LDO or resistor-capacitor network is preferred. In systems with multiple rails, the HCF40174BE’s VDD should rise after core logic stabilization but before clock signals arrive to prevent metastability.

How does the HCF40174BE compare to the CD4017 in terms of propagation delay and power efficiency at 5 V operation?: At 5 V and 25°C, the HCF40174BE typically exhibits a propagation delay of 75 ns, slightly faster than the CD4017’s 90 ns under identical conditions. Both consume similar quiescent current (~1 μA), but the HCF40174BE benefits from improved noise margins due to tighter manufacturing tolerances, resulting in cleaner switching edges. However, the CD4017 remains more widely stocked, which affects lead times in prototyping phases where availability outweighs marginal performance gains.

What layout practices reduce susceptibility to crosstalk in multi-stage HCF40174BE implementations?: To minimize crosstalk, clock traces must be routed differentially or shielded with ground guard rings, especially in dense PCBs with multiple digital lines. Keep clock and data paths orthogonal to analog regions, and avoid parallel routing over long distances. Decoupling capacitors should be placed directly adjacent to VDD and GND pins, and package inductance should be minimized by using wide power traces. Simulation of parasitic extraction models helps identify hotspots where capacitive coupling might induce false triggering.

Can the HCF40174BE be used in synchronous vs. asynchronous decoding applications, and what are the trade-offs?: The HCF40174BE functions primarily as a synchronous decade counter, meaning all outputs advance simultaneously with the rising edge of the clock, making it ideal for precise sequencing tasks like LED chasing or motor control. Unlike asynchronous counters, it avoids ripple delay accumulation, enabling deterministic timing. However, this also limits its use in applications requiring variable pulse widths without external gating. For asynchronous decoding, additional logic would be needed to sample outputs at specific intervals, adding latency and complexity.

How does the input capacitance of the HCF40174BE affect high-frequency signal integrity when driven from a microcontroller GPIO?: Each input of the HCF40174BE presents a small but non-negligible capacitance (typically 5–10 pF), which forms an RC low-pass filter with source impedance. When driven from a 25 Ω GPIO output at 3.3 V, this limits bandwidth to roughly 1–2 MHz, sufficient for most control loops but problematic above 10 MHz. To preserve rise/fall times, series termination or buffer insertion may be required for high-speed clocks, or slower edge rates may be accepted if timing budgets allow.

What are the consequences of operating the HCF40174BE outside its absolute maximum ratings, particularly VDD exceeding 15 V?: Exceeding 15 V on VDD risks dielectric breakdown in the gate oxide layers, potentially causing irreversible damage even if functionality appears normal initially. Similarly, negative voltage transients below 0 V can forward-bias parasitic diodes, leading to latch-up or excessive power dissipation. Even brief excursions above 18 V may compromise reliability over time. Always include clamping diodes or Zener regulators in the power path to enforce compliance with absolute maximum ratings, especially in automotive or lighting applications subject to load dump transients.

How does the HCF40174BE perform in radiation-hardened or space-constrained environments, and what alternatives exist if size is critical?: The HCF40174BE is not radiation-hardened and suffers from single-event upsets (SEUs) in high-altitude or satellite applications. Its SOT23-6 footprint is compact for a 6-pin IC, but alternative packages like SC70 offer further miniaturization. For space-grade reliability, designers must consider specialized rad-hard counters such as those from BAE Systems or Honeywell, though these come at significantly higher cost and longer procurement cycles. In terrestrial consumer electronics, the HCF40174BE remains viable with adequate error detection and redundancy.

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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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HCF40174BE

STMicroelectronics
32D-HCF40174BE

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HCF40174BE - 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.