74HC4040BQX - 12-Stage Binary Ripple Counter | Nexperia
Артикул: 74HC4040BQX ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $0.62 | $0,62 |
| 10 | $0.55 | $5,50 |
| 100 | $0.41 | $41,00 |
| 500 | $0.34 | $170,00 |
| 1.000 | $0.28 | $280,00 |
| 3.000 | $0.22 | $660,00 |
74HC4040BQX Обзор
A binary counter, also called a ripple counter or divide-by-N counter, is a sequential logic circuit formed by cascading toggle flip-flops. Each stage divides the previous stage's frequency by two, producing output frequencies of fCLK/2, fCLK/4, ... fCLK/4096 at Q0..Q11. Ripple counters sit within the broader hierarchy of digital logic -> sequential logic -> counters -> frequency dividers -> clock-generation circuits, and remain widely used for low-cost timing, event-counting and watchdog applications where synchronous operation is not required.
Key features of the 74HC4040BQX include an asynchronous master reset (MR) input that asynchronously clears all twelve stages and forces all outputs LOW regardless of CP state, wide operating voltage range of 2.0 V to 6.0 V, typical propagation delay of a few nanoseconds per stage, and low quiescent current. The 74HC variant accepts standard CMOS input levels while the pin-compatible 74HCT4040 variant supports TTL-level inputs for mixed-logic interfaces.
Architecturally, each counter stage is a static toggle flip-flop that ripples carry from the previous stage's Q output to the next stage's clock input. This asynchronous topology limits the maximum usable clock frequency for long count chains because the cumulative delay adds as the count propagates, but for divide-by-4096 applications at modest frequencies the device is more than adequate.
Typical applications include frequency division and clock generation, event/timeout counters, watchdog timers, binary address scanning in LED or relay driver chains, and waveform synthesis. Designers also use the 74HC4040 family to derive sub-system timing from a master oscillator or microcontroller clock.
A key design consideration with ripple counters is the asynchronous nature of the carry - outputs do not change simultaneously and glitches may be present on intermediate outputs during transitions. For designs requiring glitch-free synchronous division, a synchronous counter such as the 74HC161 family is preferred. The MR reset is asynchronous and must be debounced in noisy environments.
This page synthesizes distributor pricing, drop-in alternatives and practical design notes not found in the manufacturer datasheet alone, providing engineering context that complements the official Nexperia product family documentation.
Аналоги без доработки для 74HC4040BQX — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
74HCT4040BQX
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
74HC4040BQ,115
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
HEF4040BT,653
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
CD4040BD3
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MC74HC4040ADTR2G
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
SN74HC4040BQX
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
74HC4040BQX Максимальные параметры и электрические характеристики
| Logic Type | Binary Counter |
| Number of Elements | 1 |
| Number of Bits per Element | 12 |
| Trigger Type | Negative Edge |
| Clock Input (CP) Polarity | Advances on HIGH-to-LOW transition |
| Reset Type | Asynchronous Master Reset (MR), active HIGH |
| Количество выходов | 12 (Q0 to Q11) |
| Supply Voltage (VCC) | 2.0 V to 6.0 V |
| Input Logic Levels | CMOS (74HC variant); TTL (74HCT variant) |
| Technology | High-speed Si-gate CMOS |
| Корпус | 16-DHVQFN (SOT763), 2.5x3.5 mm |
| Тип монтажа | Surface Mount |
| Рабочая температура | -40 C to +125 C |
| Статус RoHS | Compliant |
| JEDEC Standard | JEDEC standard no. 7A |
| Pin Compatibility | Pin compatible with HEF4040B series |
Конфигурация выводов 74HC4040BQX
| Контакт 1 | Q11 — Counter output bit 11 (divide-by-4096) |
| Контакт 2 | Q5 — Counter output bit 5 (divide-by-64) |
| Контакт 3 | Q4 — Counter output bit 4 (divide-by-32) |
| Контакт 4 | Q6 — Counter output bit 6 (divide-by-128) |
| Контакт 5 | Q3 — Counter output bit 3 (divide-by-16) |
| Контакт 6 | Q7 — Counter output bit 7 (divide-by-256) |
| Контакт 7 | Q2 — Counter output bit 2 (divide-by-8) |
| Контакт 8 | GND — Ground (0 V) |
| Контакт 9 | Q8 — Counter output bit 8 (divide-by-512) |
| Контакт 10 | MR — Asynchronous master reset, active HIGH |
| Контакт 11 | CP — Clock input, advances on HIGH-to-LOW transition |
| Контакт 12 | Q9 — Counter output bit 9 (divide-by-1024) |
| Контакт 13 | Q1 — Counter output bit 1 (divide-by-4) |
| Контакт 14 | Q10 — Counter output bit 10 (divide-by-2048) |
| Контакт 15 | Q0 — Counter output bit 0 (divide-by-2) |
| Контакт 16 | VCC — Supply voltage (2.0 V to 6.0 V) |
Типичное применение
74HC4040BQX подходит для 6 применениеs: Frequency Division and Clock Generation, Event Counter and Timeout Watchdog, Binary Address Scanner for LED / Relay Chains, Waveform Synthesis and Sub-system Timing, Long-interval Timer for Industrial Automation, Divide-by-N for Communication and PLL Cascading.
Frequency Division and Clock Generation
The 74HC4040BQX's 12 cascaded toggle flip-flops provide direct frequency division by powers of two from a master clock. Each output Qn divides by 2^(n+1), giving division ratios from /2 up to /4096 at Q11. With a 1 MHz master oscillator driving CP, Q3 outputs a clean 125 kHz and Q9 outputs ~2 Hz for low-frequency timing. The 2.0-6.0 V VCC range and standard CMOS thresholds allow direct connection to microcontroller clock trees. Ripple delay must be considered at high frequencies: cumulative propagation through 12 stages can exceed one clock period above a few MHz, so designers should clock from a low-frequency tap or use a prescaler.
Рекомендуется
Event Counter and Timeout Watchdog
The 74HC4040BQX works as a low-cost binary event counter in industrial control and battery-powered systems. Drive CP with a debounced event pulse and read the 12-bit count via Q0-Q11 to obtain counts up to 4095. The asynchronous master reset (MR) lets the host microcontroller clear the counter on demand. At 3.3 V VCC the device draws only microamp-level standby current, making it suitable for long-duration timeout watchdog functions in IoT edge nodes. For noisy environments, place a 100 nF decoupling capacitor close to VCC (pin 16) and add a Schmitt trigger (e.g. 74HC14) on the CP input.
Рекомендуется
Binary Address Scanner for LED / Relay Chains
The 12-bit parallel output of the 74HC4040BQX makes it an excellent binary address scanner that sequentially walks through 4096 states, ideal for chasing-LED effects, multiplexer address generation and relay driver sequencing. With the asynchronous MR tied to a one-shot on power-up, the counter starts from a known state and advances through every code until reset. The 16-DHVQFN 2.5x3.5 mm footprint allows placement in tight LED-strip and signage PCBs. Designers should gate the clock with a low-frequency oscillator (~10 Hz) for visible LED patterns or use a higher rate for matrix addressing.
Рекомендуется
Waveform Synthesis and Sub-system Timing
The 74HC4040BQX provides tapped frequency division useful for deriving multiple sub-system clocks from a single crystal oscillator reference. Each Qn output can drive a separate logic block, with Q0 providing fCLK/2 and Q11 providing fCLK/4096. The asynchronous MR enables generation of fixed duty-cycle waveforms when combined with external gating logic. This makes the device a flexible building block for timing generation in motor control, PWM synthesis and sequenced power-up circuits where multiple clock domains are required.
Рекомендуется
Long-interval Timer for Industrial Automation
By dividing a low-frequency reference (32.768 kHz watch crystal or 1 Hz RTC tick) by 4096, the 74HC4040BQX generates interval periods from seconds to hours for industrial timers, sequencers and machine-cycle controllers. The wide -40 C to +125 C operating range suits factory-floor environments, and the 2.0-6.0 V supply matches 3.3 V and 5 V PLC backplanes. Use the MR pin to latch a start time and the Q11 output as the end-of-interval interrupt. Pair with an RTC such as the PCF8563 for synchronous long-duration timing in SCADA systems.
Рекомендуется
Divide-by-N for Communication and PLL Cascading
The 74HC4040BQX can prescale a high-frequency reference down to a frequency acceptable for a microcontroller timer/capture input, or feed successive divider stages to build a multi-decade PLL chain. With Qn outputs at fCLK/2^(n+1), the device conveniently drops a fast oscillator into the kHz range for low-power MCUs that lack high-frequency timers. The CMOS input thresholds on the 74HC variant pair cleanly with 3.3 V oscillator modules. Add a series resistor on CP when driving from a >10 MHz source to limit ground-bounce-induced false clocks.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для 74HC4040BQX — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | 74HCT4040BQX | 74HC4040BQ,115 | HEF4040BT,653 | CD4040BD3 |
|---|---|---|---|---|---|
| Package | 16-DHVQFN (SOT763) 2.5x3.5 mm | 16-DHVQFN (SOT763) - same | 16-DHVQFN (SOT763) - same | 16-DHVQFN (SOT763) - same | 16-DHVQFN cross-reference - same |
| Brand | Nexperia | Nexperia | Nexperia | Nexperia | Texas Instruments |
| Input Logic Level | CMOS (74HC) | TTL (74HCT) | CMOS (74HC) | CMOS (HEF4000B) | CMOS (CD4000) |
| Supply Voltage Range | 2.0 V to 6.0 V | 4.5 V to 5.5 V (TTL supply) | 2.0 V to 6.0 V | 3.0 V to 15 V | 3.0 V to 18 V |
| Number of Stages | 12 | 12 | 12 | 12 | 12 |
| Reset Type | Asynchronous MR, active HIGH | Asynchronous MR, active HIGH | Asynchronous MR, active HIGH | Asynchronous MR, active HIGH | Asynchronous MR, active HIGH |
| Operating Temperature | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +85 C | -55 C to +125 C |
| JEDEC Compliance | JEDEC standard no. 7A | JEDEC standard no. 7A | JEDEC standard no. 7A | JEDEC standard no. 7A | JEDEC standard no. 7A |
| RoHS Status | Compliant | Compliant | Compliant | Compliant | Compliant |
Ключевые отличия
- High-speed CMOS 74HC logic family with JEDEC no. 7A compliance (против HEF4040BT,653)
- Drop-in 74HCT variant available in identical package (против 74HCT4040BQX)
- Wider operating temperature range than HEF4000B (против HEF4040BT,653)
Заметки по проектированию
Place a 100 nF ceramic decoupling capacitor as close as possible to the VCC pin (pin 16) and GND pin (pin 8) of the 74HC4040BQX. For designs with high-frequency CP edges, add a bulk 10 uF tantalum or ceramic capacitor near the supply pin. The 2.0-6.0 V supply range allows direct connection to 3.3 V or 5 V rails without level translation; an RC low-pass on VCC helps suppress noise from switching regulators sharing the rail.
The 74HC4040BQX is an asynchronous ripple counter, so outputs do not change simultaneously - intermediate Q outputs may exhibit decode glitches for one ripple-delay window. Do not use individual Qn outputs as glitch-free decoded states; instead, use synchronous counters (74HC161/74HC163) for decoded outputs. For frequency-division applications where only the divided frequency matters, ripple delay is irrelevant as long as the master clock period exceeds the cumulative 12-stage propagation delay.
The 16-DHVQFN (SOT763) package measures only 2.5x3.5 mm and has a center thermal/exposed pad that should be soldered to a copper land for mechanical reliability. Use NSMD (non-solder mask defined) pads with a 0.3 mm pitch and follow Nexperia's DHVQFN land-pattern recommendations. Keep high-speed clock traces short and routed away from analog sections to minimize coupling. Provide adequate ground copper under the device to reduce ground bounce on the asynchronous MR pin.
Do not leave the MR pin floating - an unconnected MR can pick up noise and falsely reset the counter. Tie MR through a 10 kohm pull-down to GND if not driven by an active signal. Also, ensure the CP input has clean edges: a slow or bouncing clock causes multiple counts per intended pulse. Insert a Schmitt trigger (74HC14) between a mechanical switch or RC oscillator and CP for reliable single-count operation.
Информация о соответствии
RoHS and REACH compliant per Nexperia product page. JEDEC standard no. 7A compliant. Not AEC-Q100 qualified - automotive designs should verify with Nexperia for the latest automotive-grade options.
