CD4026BF - 5-Bit Decade Counter | Harris Corporation | Displays
Référence : CD4026BF ✗ Fin de vieCD4026BF Présentation
A CMOS decade counter is a synchronous digital counter that advances through ten states for each complete decade of input pulses. The CD4026B combines a 5-stage Johnson counter with a seven-segment decoder, while the CD4033B provides a similar counter structure with binary rather than decoded display outputs. Within the broader hierarchy, the CD4026BF is a CMOS logic IC, a counter and divider, and a display-decoding integrated circuit. This integration is especially useful where low power dissipation, compactness, and direct seven-segment drive capability are important.
The verified product data identifies a single counter element, 5-bit output organization, positive-edge triggering, and a 16-CDIP package. Its stated 3 V to 18 V supply range permits operation from conventional 5 V and 9 V logic systems as well as 15 V industrial-class supply rails. The stated 16 MHz operating frequency provides substantial counting headroom for digital clocks, timers, counters, sequencing circuits, and instrumentation. A qualified power design must still preserve the supply limits and respect the timing requirements of the connected logic family.
The CD4026BF includes clock, clock-inhibit, reset, carry-in, carry-out, decoded display, and supply connections. Its decoded outputs are intended for one seven-segment numerical display rather than arbitrary seven-segment patterns. Carry-in and carry-out support decimal chaining, allowing multiple counting stages to represent values beyond a single decade. The external clock can be inhibited when required, while reset provides a defined starting state. Exact pin functions and electrical limits should be confirmed against the manufacturer datasheet before layout or production release.
Typical uses include digital frequency meters, event counters, industrial panel displays, timer terminals, laboratory instruments, and compact decade-counting modules. In a seven-segment display application, the device can replace separate counter and decoder ICs, simplifying the board area and reducing interstage wiring. In cascaded decimal applications, carry-out can drive the next counter while carry-in determines the selected decade. Designers should account for display current, segment resistors, and the electrical loading of any additional logic connected to the decoded outputs.
A critical design consideration is decoupling. Place the required supply-bypass capacitor close to the 16-CDIP power and ground pins, minimize the clock path between the oscillator or signal source and the clock input, and route return currents without sharing narrow paths with display-current returns. The CD4026BF is a digital counter rather than a power semiconductor, so a safe operating area specification is not applicable. Component marking, ceramic or hermetic grade, temperature grade, and sourcing conditions should be verified against the approved manufacturer documentation.
This page consolidates the verified distributor specifications, package information, cross-reference evidence, practical application guidance, and honest replacement analysis for the CD4026BF. It also distinguishes electrically similar counter options from genuinely verified drop-in choices, helping engineers avoid assuming that same-family CMOS logic parts are interchangeable without checking pinout, supply voltage, display outputs, temperature grade, and package construction.
Alternatives de remplacement direct pour CD4026BF — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec CD4026BF (même facteur de forme et même empreinte) — différant par Display Output, Logic Family.
CD4026BE
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
CD4026BF/3
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
CD4033BE
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →CD4026BF Valeurs maximales et caractéristiques électriques
| Counter Type | Decade counter with 7-segment decoder |
| Number of Counter Elements | 1 element |
| Output Organization | 5 bit |
| Clock Edge | Positive edge |
| Supply Voltage Range | 3 V to 18 V |
| Fréquence d'horloge maximale | 16 MHz |
| Counter Architecture | 5-stage Johnson counter with decoded 7-segment output |
| Package Type | 16-CDIP |
| Total Pin Count | 16 pins |
| Type de montage | Through-hole |
| Logic Family | CD4000 CMOS series |
| Technology | CMOS |
| Display Output | Decoded 7-segment output for one numerical display |
| Carry Function | Carry-in and carry-out decimal chaining |
| Statut RoHS | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | unknown |
Guide de configuration des broches du CD4026BF 16-cdip
Configuration des broches du CD4026BF (boîtier 16-cdip). Ce circuit intégré numérique comprend des GPIO, des interfaces de communication (UART, SPI, I2C) et des broches d'alimentation. Consultez la fiche technique du fabricant pour les fonctions alternatives des broches et les options de configuration. Indispensable pour la conception de systèmes embarqués et la conception de circuits imprimés.
Aucune donnée de brochage détaillée disponible pour CD4026BF.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
CD4026BF convient pour 6 applications: Digital Event Counter, Seven-Segment Panel Display, Frequency Divider, Industrial Timer Display, Digital Clock and Preset Counter, Sequencing and Test Counter.
Digital Event Counter
The CD4026BF fits digital event and pulse counting because its positive-edge-triggered decade counter advances through ten states per counting cycle while operating from 3 V to 18 V. The verified 16 MHz frequency capability leaves substantial margin for common clock and pulse sources. In this application, the device is placed between the input conditioning stage and the display or downstream decimal logic, with reset used to establish the initial count. Carry-out can clock a second stage when values beyond one decade are required. Designers should use the manufacturer timing data to establish the maximum external pulse rate, account for input rise time, and add conditioning when a mechanical switch or noisy transducer can generate multiple edges. The CD4026BF is advantageous because the counter and display-decoder functions are integrated, reducing board area compared with separate counter and decoder ICs.
Recommandé
Seven-Segment Panel Display
The CD4026BF is suited to one-digit seven-segment panel displays because its internal Johnson counter is decoded into display-drive outputs, eliminating a separate decoder stage. The verified 3 V to 18 V operating range permits use with several CMOS logic rails, while the integrated display function keeps the external signal path short. The counter is placed in the display subsystem and advances after each qualified clock pulse; reset clears the displayed state. Segment current, display forward voltage, and resistor values must be calculated from the particular display and the device's output-current limits, which are not included in the supplied excerpts. Because decoded outputs are not interchangeable with binary counter outputs, CD4026BF is preferable to CD4033BE when the existing board expects direct seven-segment drive signals.
Recommandé
Frequency Divider
The CD4026BF can divide an input frequency into lower-rate or decimal-scaled events because it is explicitly categorized as a counter and divider and supports operation up to 16 MHz. The clock input receives a qualified waveform, while the counter advances one state per positive edge and supplies decoded or carry-derived timing information for downstream stages. For cascaded division, carry-out can become the clock input of another counter and carry-in can control which decade participates in the count. The integration of counting and display decoding makes the device useful in compact divider modules that show a count directly. Engineers should preserve clock-signal rise time, avoid excessive loading on decoded outputs, and verify setup and reset timing against the exact manufacturer datasheet before operating near the stated frequency ceiling.
Recommandé
Industrial Timer Display
The CD4026BF can implement a compact industrial timer display when one decimal digit must be incremented or decremented through external control logic. Its 3 V to 18 V supply range supports conventional CMOS supply rails, while the positive-edge counter and integrated seven-segment decoder reduce the number of ICs required around the display. The timer reference or clock-enable signal enters the counting path, and reset establishes a known display state after power-up. For multi-digit timing values, decimal stages can be chained through carry-in and carry-out, although display blanking and synchronization must be handled elsewhere to avoid visible intermediate states. The selected CD4026BF suffix must be checked for the actual operating-temperature grade, and supply bypassing should be placed close to the device to limit switching transients on the panel rail.
Recommandé
Digital Clock and Preset Counter
The CD4026BF is applicable to digital clock and preset-counter circuits because it combines a decade-counting element with a display decoder and provides reset and clock-inhibit controls. A time-base oscillator can provide periodic count pulses, while clock inhibit can hold the current count when required. The decoded outputs drive a numerical display without requiring a separate Johnson-to-seven-segment decoder. The 16 MHz verified maximum frequency comfortably exceeds the repetitive pulse rate of typical display time bases, although real timing depends on the exact oscillator waveform and supply level. For debouncing user-set controls, external conditioning should be used rather than relying on the counter's reset or inhibit terminals to remove mechanical-contact bounce. Designers should also verify display-current sharing and connector-induced noise under the complete system power and grounding plan.
Recommandé
Sequencing and Test Counter
The CD4026BF can serve as a sequencing or test counter in instrumentation that must accumulate steps, cycles, or test positions while exposing the count to a numerical display. Its positive-edge clocking, reset input, and carry-chain capability support repeatable measurement sequences, while the integrated decoder minimizes the number of external logic packages. The device is connected after the test fixture's qualified event signal, with carry-out used for higher-order counting when required. Because the supplied excerpts do not state output-drive capability, input thresholds, or timing margins, the complete manufacturer datasheet must be used to confirm compatibility with the fixture voltage levels and external clock rate. A star ground or controlled return-current arrangement is advisable when the display shares the measurement circuit, preventing display currents from shifting counter input thresholds.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour CD4026BF — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | CD4026BE | CD4026BF/3 | CD4033BE |
|---|---|---|---|---|
| Brand | Harris Corporation | Texas Instruments | Harris Corporation | Texas Instruments |
| Package | 16-CDIP | 16-CDIP | 16-CDIP | 16-CDIP |
| Counter Type | Decade counter and divider | Decade counter and divider | Decade counter and divider | Binary counter and divider |
| Display Output | Decoded 7-segment output | Decoded 7-segment output | Decoded 7-segment output | Binary counter output |
Principaux différenciateurs
- Direct seven-segment decoding (vs CD4033BE)
- Verified 16 MHz operating capability (vs CD4026BE)
- Direct same-series grade option (vs CD4026BF/3)
Notes de conception
Do not treat every CD4000-family counter as interchangeable. CD4026BF provides decoded seven-segment outputs, while CD4033BE provides binary outputs; although the verified comparison reports compatible packages and terminals, an unchanged PCB will not produce the same display behavior with the binary-output part. Confirm whether downstream circuitry consumes decoded segment signals, carry pulses, or binary count bits. Also compare the exact suffix-specific temperature grade and package construction before changing the BOM.
Keep the CD4026BF supply-bypass connection short and place it close to the 16-CDIP supply and ground terminals. The verified data establishes a 3 V to 18 V operating range but does not provide the required bypass capacitance, so use the manufacturer recommendation rather than an arbitrary value. Isolate display-current returns from sensitive clock and signal returns where possible to prevent display transients from shifting input thresholds. This is particularly important when an external display shares the same connector and power source as the counter.
The verified maximum frequency is 16 MHz, but practical design margin depends on clock rise time, supply voltage, temperature, output loading, and the exact timing guarantees. Keep the clock route short, avoid breadboard wiring for high-rate operation, and use a clean edge rather than a slow switch signal. If a mechanical input can bounce, add conditioning or use clock inhibit and reset sequencing. Review setup and hold timing against the full manufacturer datasheet because those values are not contained in the supplied excerpts.
Use a through-hole footprint that matches the verified 16-CDIP package and verify lead spacing, row spacing, pin numbering, and ceramic or plastic body dimensions from the exact mechanical drawing. Do not rely on a generic 16-pin DIP symbol for production layout without checking the manufacturer package drawing. Keep display connectors and high-current LED returns physically separated from the clock input trace, and provide adequate decoupling at the IC pins rather than only at the system power connector.
Informations de conformité
The supplied verified snippets do not contain current compliance declarations or qualification records. RoHS, REACH, AEC-Q100, lead-free, halogen-free, and conflict-minerals status remain unknown as of 2026-10-30.
