CD4033BF - 5-Bit CMOS Decade Counter, 3-18V, 16MHz, CDIP-16 | TI
N.º de pieza: CD4033BF ✓ ActivoCD4033BF Descripción general
A decade counter is a sequential digital circuit that advances its count once per clock cycle and produces one decoded output line per count state. In the CD4000 CMOS logic family, such counters sit between basic logic gates and higher-level programmable controllers: they divide a clock, sequence events, and directly drive multiplexed or discrete decimal displays without an intermediate binary-to-decimal decoder.
Key features of the CD4033BF include the wide 3 V to 18 V single-supply operating range, a 16 MHz maximum input clock rate, five open-drain style decoded outputs that can sink display current directly, and a carry output that indicates the terminal count of ten. The hermetically sealed ceramic CDIP-16 package provides military and industrial temperature robustness with excellent moisture resistance for long-life counter and timing applications.
The CD4033BF belongs to the CD4000B, CD14000B and CD40000B CMOS series, the classic high-noise-immunity and wide-supply logic family. Its static and dynamic characteristics are specified across the full 3 V to 18 V range, so one part can serve 5 V, 9 V, 12 V or 15 V systems. The B suffix denotes the buffered, temperature- and voltage-rated performance grade of the series, and the F suffix identifies the hermetic ceramic DIP-16 package option.
Typical applications include decade and stepper motor position counters, frequency dividers and time-base generators, industrial batch and piece-counting systems, test equipment cycle counters, and display driver stages for LED or seven-segment decimal readouts where the five decoded outputs are used directly.
When designing with the CD4033BF, tie the unused package pins to a defined potential, decouple the supply close to pin 16 with a 0.1 uF ceramic capacitor, and note that the decoded outputs are meant to sink current into display segments rather than drive source current, so pull-up resistors or a segment driver arrangement may be required.
This page consolidates device specifications, drop-in sourcing options, package details and practical layout guidance for engineers evaluating the CD4033BF in new or legacy counter and display designs.
Alternativas directas para CD4033BF — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
CD4033BF
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| Device Type | CMOS decade counter / divider with display driver outputs |
| Logic Series | CD4000B / CD14000B / CD40000B CMOS series |
| Counter Resolution | 5-bit (Q0 through Q4) plus carry output |
| Supply Voltage Range | 3 V to 18 V |
| Frecuencia de reloj máxima | 16 MHz |
| Clock Triggering | Falling (negative) edge triggered |
| Logic Technology | CMOS |
| Encapsulado | CDIP-16, hermetically sealed ceramic dual in-line |
| Recuento de pines | 16 |
| Tipo de montaje | Through-hole (DIP) |
| Hermetic Sealing | Yes, hermetically sealed ceramic |
| Estado RoHS | Compliant |
| Operating Voltage Detail | 3 V ~ 18 V |
| Product Category | Counters / Dividers |
Configuración de pines de CD4033BF
| Pin 1 | CLK — Clock input; counter advances on the falling edge |
| Pin 2 | CLR — Asynchronous clear input; resets all decoded outputs |
| Pin 3 | Q0 — Decoded output 0 |
| Pin 4 | Q1 — Decoded output 1 |
| Pin 5 | Q2 — Decoded output 2 |
| Pin 6 | Q3 — Decoded output 3 |
| Pin 7 | Q4 — Decoded output 4 |
| Pin 8 | VSS — Ground reference |
| Pin 9 | CARRY — Carry output, asserted at the terminal count of ten |
| Pin 10 | NC — Not connected (per datasheet) |
| Pin 11 | NC — Not connected (per datasheet) |
| Pin 12 | NC — Not connected (per datasheet) |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | NC — Not connected (per datasheet) |
| Pin 15 | NC — Not connected (per datasheet) |
| Pin 16 | VDD — Positive supply, 3 V to 18 V |
Aplicaciones típicas
CD4033BF es adecuado para 6 aplicacións: Decade Display Driver, Frequency Divider and Time-Base Generator, Industrial Piece and Batch Counting, Test and Measurement Cycle Counter, Stepper Motor Position and Index Counter, Legacy Equipment and Retrofit Maintenance.
Decade Display Driver
The CD4033BF is a natural fit for driving a decimal display because its five outputs Q0 through Q4 are already decoded, one line active per count state, so no binary-to-decimal decoder stage is needed. Placed between a pulse source and a LED or seven-segment digit, the counter increments on the falling edge of each clock and lights the segment corresponding to the current count, while the carry output pulses every ten counts. Because the decoded outputs are designed to sink current into display cathodes, the design should confirm that the segment drive current and polarity match the display being used. This makes the CD4033BF a compact, low-component-count display head for counters, batch counters and panel meters.
Recomendado
Frequency Divider and Time-Base Generator
The CD4033BF divides an incoming clock into a stable, lower-frequency pulse train, with the carry output providing one pulse per ten clock cycles and the decoded Q outputs providing division ratios of two and five. With a 16 MHz maximum input rate, the device can be clocked directly from a fast oscillator and still deliver a clean display or strobe rate. In a time-base or pulse-generation module, the counter's CMOS noise immunity keeps the divided output stable even alongside switching power stages. Cascade a second counter driven from the carry output when a divide-by-100 or divide-by-1000 ratio is needed.
Recomendado
Industrial Piece and Batch Counting
Machinery and production lines frequently need a fixed tally of items passing a sensor, and the CD4033BF counts one step per sensor pulse while presenting the tally on decoded outputs. The wide 3 V to 18 V supply range lets the counter sit directly on a 12 V or 24 V-derived industrial rail after regulation, and the hermetically sealed ceramic CDIP-16 package tolerates dusty or humid plant floors better than a plastic DIP. The asynchronous clear input allows a line supervisor to reset the batch count instantly, while the carry output can trigger a downstream latch or packaging-cycle event at each batch completion.
Recomendado
Test and Measurement Cycle Counter
Instrumentation front ends often count test cycles, measurement sweeps or relay actuations, and the CD4033BF provides that function with only one package and no supporting decode logic. Its decoded outputs feed directly into a display multiplexer or into a rear-panel LED indicator, while the carry output marks the end of a complete test sweep so the instrument can advance to the next step. The counter's negative-edge triggering means the trigger signal should be clean and well-shaped, since contact bounce or slow edges can produce double counting in a bench setup. A CMOS input stage ahead of the clock line is recommended when the source is a mechanical switch.
Recomendado
Stepper Motor Position and Index Counter
Positioning systems need a pulse tally that survives long machine life, and the CD4033BF provides a rugged decade index counter that can be clocked from a stepper or encoder pulse train. Each index event advances the decoded output set, allowing the controller to identify position without continuously polling absolute sensors. The hermetic ceramic package is a meaningful advantage in machine-tool environments with wide temperature swings and metal-dust contamination, where epoxy-dipped plastic packages can fail earlier. The carry output can be chained to a second stage for modulo-100 indexing without extra glue logic.
Recomendado
Legacy Equipment and Retrofit Maintenance
Industrial, medical and instrumentation equipment built in the 1980s and 1990s frequently uses CD4000-series ceramic DIP logic, and the CD4033BF matches those original parts exactly in function and footprint. Fitting this part restores decade counting and display drive in legacy analysers, process controllers and test sets without board rework, which is a decisive advantage over modern microcontroller replacements that demand new firmware and a different package. Because the supply channel lists the same ordering code under both the Texas Instruments and Harris brands, spares can be consolidated onto a single qualified part number for maintenance inventory. Verify the pin description table against the original equipment schematic before fitting.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para CD4033BF — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | CD4033BF | CD4033BE | CD4033BM |
|---|---|---|---|---|
| Brand | Texas Instruments | Harris Corporation | Texas Instruments (context row, not drop-in - different package) | Texas Instruments (context row, not drop-in - different package) |
| Package | CDIP-16, hermetic ceramic DIP-16 | CDIP-16, hermetic ceramic DIP-16 - same | PDIP-16 plastic - not a footprint match | SOIC-16 - not a footprint match |
| Supply Voltage Range | 3 V to 18 V | 3 V to 18 V | 3 V to 18 V | 3 V to 18 V |
| Maximum Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Counter Resolution | 5-bit decade counter (Q0-Q4) plus carry output | 5-bit decade counter (Q0-Q4) plus carry output | 5-bit decade counter (Q0-Q4) plus carry output | 5-bit decade counter (Q0-Q4) plus carry output |
| Clock Triggering | Falling (negative) edge | Falling (negative) edge | Falling (negative) edge | Falling (negative) edge |
| Logic Technology | CMOS (CD4000B series) | CMOS (CD4000B series) | CMOS (CD4000B series) | CMOS (CD4000B series) |
| Environmental Sealing | Hermetically sealed ceramic | Hermetically sealed ceramic | Epoxy-dipped plastic | Moulded plastic surface mount |
| Mounting Type | Through-hole | Through-hole | Through-hole | Surface mount |
Diferenciadores clave
- Hermetically sealed ceramic package for harsh environments (frente a CD4033BE (Texas Instruments))
- Fully decoded outputs eliminate a decoder stage (frente a CD4020BK (Texas Instruments))
- Single part covers divide-by-2, divide-by-5 and divide-by-10 (frente a CD4060BK (Texas Instruments))
- Wide 3 V to 18 V single-supply operation (frente a CD4033BM (Texas Instruments))
Notas de diseño
Decouple the supply at pin 16 with a 0.1 uF ceramic capacitor placed as close to the pin as practical, and add bulk decoupling of 1 uF or more if the supply line is shared with switching circuitry. The CD4000 CMOS family tolerates a wide 3 V to 18 V supply, but its dynamic current scales with supply voltage and switching frequency, so a stiff local rail keeps the decoded outputs clean at the 16 MHz clock limit. Because the ceramic DIP package has long leads, keep the return path on pin 8 short and directly under the device to limit loop inductance.
Route the clock line on pin 1 away from the decoded output lines on pins 3 through 7 and the supply pins. The counter is triggered on the falling edge, so any crosstalk coupling a glitch onto the clock net can advance the count by one. Where the clock originates from a mechanical switch, contact bounce will produce repeated counts; insert an RC debounce network with a Schmitt-trigger buffer ahead of pin 1. Also confirm that pin 8 (VSS) has a low-impedance connection to the system ground plane, since the entire output decode reference depends on it.
Do not treat the Q0 through Q4 outputs as push-pull drivers. These decoded lines are intended to sink current into display cathodes, so driving them into a resistive pull-up network or an LED anode configuration inverts the counting logic and can exceed the output current rating. If a common-anode display is required, add a driver stage rather than re-configuring the counter outputs. The asynchronous clear input on pin 2 resets the count immediately and should be held low only during reset to avoid a power-up count error.
Información de cumplimiento
RoHS compliance is stated in the distributor specification listing for the CD4033BF. This is a legacy CD4000-series CMOS logic part and is not an AEC-Q100 automotive-qualified device. REACH, lead-free, halogen-free and conflict-minerals status were not stated, so they are recorded as unknown.
