CD4543BF - BCD Seven-Segment LCD/LED Driver | Harris
MPN: CD4543BF ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.1579 | $1.16 |
| 10 | $1.1579 | $11.58 |
| 100 | $1.1579 | $115.79 |
| 500 | $1.1579 | $578.95 |
| 1,000 | $1.1579 | $1,157.90 |
CD4543BF Overview
A BCD-to-seven-segment decoder is a display-driver subcategory that translates binary-coded decimal information into the seven drive lines used by a numeric display. In the broader electronics hierarchy, the CD4543BF belongs to interface ICs, display drivers, CMOS logic, and digital semiconductors. It sits between a controller or counter and a physical display, allowing a system to present digits without using a microcontroller to generate every segment waveform.
The verified manufacturer information identifies CD4543B as functionally similar to the CD4056B when pin 7 is connected to VSS. The family also provides latch, decoder, blanking, and display-driver functions, but detailed timing, voltage, current, and temperature limits were not included in the supplied search extracts. The 16-lead package and CDIP form factor make the CD4543BF suitable for through-hole industrial, educational, instrumentation, and legacy-control designs where a conventional ceramic dual-in-line package is preferred over a surface-mount package.
Typical uses include seven-segment LCD modules, multiplexed LED displays, digital counters, panel meters, timers, and embedded industrial panels. When driving LCD segments, the display's drive polarity and common-plane arrangement must match the device specifications. When driving LEDs, segment current, duty cycle, and the number of simultaneously lit digits must be checked against the display and supply limits. A decoder is not a regulated power supply or a high-current constant-current LED driver.
The principal design consideration is interface timing. The latch allows the input BCD value to be held while segment outputs are decoded, but the display system must still generate valid strobe and multiplexing signals. Confirm pin assignments, supply voltage range, output drive capability, propagation timing, and electrical limits from the manufacturer datasheet before replacing an existing CD4056B or designing new PCB artwork.
This page synthesizes the verified manufacturer classification, distributor availability, package information, family relationship, and application context for CD4543BF. It deliberately distinguishes documented information from parameters that require confirmation from the full datasheet, helping engineers avoid treating a distributor category label as a complete electrical specification.
Drop-in alternatives for CD4543BF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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Request AlternativesCD4543BF Maximum Ratings & Electrical Characteristics
| Product Type | BCD-to-seven-segment latch/decoder/driver |
| Primary Display Application | Liquid-crystal displays |
| Additional Display Capability | LED, incandescent, gas-discharge, and fluorescent displays |
| Logic Family | CMOS |
| Package | 16-CERDIP |
| Number of Leads | 16 leads |
| Input Coding | Binary-coded decimal (BCD) |
| Decoded Outputs | Seven segment outputs a-g and decimal point a |
| Latch Function | Present |
| CD4056B Relationship | Functionally similar when pin 7 is connected to VSS |
| Mounting Style | Through-hole ceramic dual-in-line |
| Display Drive Type | LCD and LED display driver |
| RoHS Status | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | not_applicable |
CD4543BF 16-cerdip Pin Configuration Guide
Pin configuration for CD4543BF (16-cerdip package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for CD4543BF.
Refer to the datasheet for full pin configuration.
Typical Applications
CD4543BF is suitable for 6 applications: Seven-Segment LCD Counter, Multiplexed LED Display, Digital Timer Panel, Industrial Panel Meter, Educational Logic-Control Trainer, Legacy Instrumentation Display.
Seven-Segment LCD Counter
The CD4543BF suits a counter front panel where a BCD digit must be decoded for a liquid-crystal seven-segment display. Connect the counter's four BCD lines and latch-control signal to the decoder, then route the seven segment outputs and decimal point to the display module. Its CMOS interface and latch function help hold a digit while the display system handles multiplexing. Confirm the LCD common-plane arrangement, supply voltage, and timing from the manufacturer datasheet before finalizing polarity and strobe timing.
Recommended
Multiplexed LED Display
CD4543BF can participate in a multiplexed LED numeric display because the CD4543B family supports LED applications in addition to LCDs. The BCD digit is decoded into segment outputs and selected according to the display's digit-drive scheme. LED brightness depends on segment current, duty cycle, resistor or current-driver design, and the number of illuminated segments; those values are not supplied in the verified extracts and must be checked before implementation.
Recommended
Digital Timer Panel
A timer or clock can use CD4543BF to translate a BCD time digit into a visible seven-segment indication. The latch function helps separate input-data changes from the display's update sequence, which is useful when several digits are scanned. Design the interface so BCD input remains valid during the specified latch interval and so display drive polarity matches the LCD or LED module. Verify timing and output limits against the complete CD4543B datasheet.
Recommended
Industrial Panel Meter
The CD4543BF is suitable for a compact industrial panel meter when the measurement system presents a BCD value and the display uses seven segments. The 16-CERDIP through-hole package is useful for board-level or legacy panel assemblies, while the decoder reduces the number of output lines required from the measurement controller. Check operating temperature, supply voltage, and display-drive current against the actual enclosure and sensor electronics before production.
Recommended
Educational Logic-Control Trainer
CD4543BF can simplify a digital-logic trainer by displaying a BCD digit without requiring a microcontroller to drive every segment line. It is useful in counters, sequencing demonstrations, and latch experiments because the decoded output makes the relationship between BCD input and visible segments easy to inspect. The through-hole 16-CERDIP package is convenient for prototyping, although the exact pinout and supply limits should be taken from the datasheet.
Recommended
Legacy Instrumentation Display
CD4543BF fits legacy instrumentation that retains a conventional 16-lead ceramic dual-in-line footprint and needs BCD-to-seven-segment decoding. The decoder can sit between a counter or control latch and a numeric display, preserving a straightforward through-hole construction. For an existing design, compare pin 7 treatment, display polarity, supply voltage, and timing with the original device. For a new design, verify lifecycle availability and long-term sourcing before committing the footprint.
Recommended
Recommended Products Summary
Engineering reference data for CD4543BF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Package | 16-CERDIP |
| Brand | Harris Corporation |
| Device Type | BCD-to-seven-segment latch/decoder/driver |
| Primary Display Application | Liquid-crystal displays |
| Additional Display Support | LED, incandescent, gas-discharge, and fluorescent displays |
| Logic Family | CMOS |
| BCD Input | Supported |
| Latch Function | Supported |
| CD4056B Compatibility | Functionally similar when pin 7 is connected to VSS |
| Verified Price | $1.1579 starting price as of 2026-10-23 |
Key Differentiators
- Broad display-technology support (vs CD4056B)
- Through-hole ceramic package (vs CD4543BPWR)
- Legacy family continuity (vs CD4543BMT)
Design Notes
Use the manufacturer package drawing rather than a generic 16-pin symbol when laying out the CD4543BF PCB footprint. The CD4543BF is identified as a 16-CERDIP part, so lead spacing, ceramic-package body dimensions, and through-hole drill geometry must match that package. Confirm pin 1 orientation and the exact pin functions from the CD4543B datasheet before routing BCD inputs and display outputs.
Treat the BCD input and latch-control traces as a defined digital interface. Keep display segment traces away from sensitive analog or switching nodes, provide a stable local return path, and avoid routing segment lines through areas with high crosstalk. Because the supplied data does not include propagation-delay or latch-strobe limits, calculate interface timing from the full manufacturer datasheet rather than assuming timing from the CD4056B.
Determine the display load and supply current from the selected LCD or LED module before choosing the supply rail. The CD4543BF is a logic/display decoder, not a regulated LED constant-current driver. For LED segments, use appropriate current limiting and verify peak and average current under the maximum digit pattern; for LCD segments, verify common-plane polarity and the device's permitted drive configuration.
Compliance Information
The supplied search results do not provide verified RoHS, REACH, halogen-free, lead-free, conflict-minerals, or automotive qualification statements. AEC-Q100 is marked not_applicable because the supplied data identifies an industrial/display-driver function and does not identify an automotive-qualified variant.
