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CD4511BE

BCD-to-7-segment latch/decoder/driver, 25mA, PDIP-16

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Manufacturer Part：

CD4511BE

Package：

PDIP-16 (19.3 x 6.35 x 4.57mm, 2.54mm pitch, through-hole)

Brand：

Product Categories：

Integrated Circuits ICs, Interface ICs

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Description

Product Overview

The CD4511BE from Texas Instruments is a CMOS BCD-to-7-segment latch/decoder/driver with active-HIGH segment outputs, capable of directly driving common-cathode LED displays at up to 25mA per segment in a 16-pin PDIP package.

Key Specifications

Function	BCD-to-7-segment latch/decoder/driver
Supply Voltage	3V to 18V
Input	4-bit BCD (D, C, B, A)
Output	7 segment outputs (a-g), active HIGH
Output Current	25mA per segment @ VDD=10V
Latch Enable	Active LOW (transparent when LOW)
Lamp Test	Active LOW (all segments on)
Blanking	Active LOW (all segments off, for leading zero suppression)
Invalid BCD (10-15)	All segments off (blank)
Operating Temperature	-55°C to +125°C
Package	PDIP-16 (19.3 x 6.35mm)

Features

BCD-to-7-segment decode + latch in one IC
25mA output drive — directly drives LEDs
Lamp test input — all segments on for diagnostics
Ripple blanking input — leading zero suppression
Blanking on invalid BCD inputs (10-15)
CMOS 4000B: 3V-18V operation

Applications

BCD counter display driver
Multiplexed multi-digit displays
Digital clock and timer
Instrumentation panel display

Product Introduction:CD4511BE Product Introduction

The CD4511BE from Texas Instruments is a CMOS BCD-to-7-segment latch/decoder/driver that accepts a 4-bit BCD input and drives a common-cathode 7-segment LED display. Unlike the CD4026 (which is a counter+decoder), the CD4511 only decodes — it doesn’t count. This makes it suitable for use with external counters (CD4017, CD4029, 74LS90, or microcontroller BCD outputs). The 25mA output current per segment is sufficient to directly drive LEDs with appropriate current-limiting resistors (typically 220Ω-1kΩ per segment at 5V). The latch stores the BCD value when LE goes HIGH, freezing the display while the input changes. The Lamp Test (LT, active LOW) turns all segments on simultaneously for display verification. The Blanking Input (BI, active LOW) turns all segments off for leading zero suppression or display multiplexing. Invalid BCD inputs (10-15) are automatically blanked. The BE suffix denotes the PDIP-16 package with full temperature range.

Working Principle:CD4511BE Working Principle

The CD4511BE has three functional blocks: (1) A 4-bit transparent latch controlled by LE: when LE is LOW, the latch is transparent (outputs follow inputs); when LE goes HIGH, the current BCD value is latched and held. (2) A BCD-to-7-segment decoder that converts the latched BCD value to 7-segment format. Digits 0-9 produce normal segment patterns; digits 10-15 (invalid BCD) produce blank output (all segments off). (3) An output driver that provides active-HIGH current-limited outputs capable of sourcing up to 25mA per segment. The three control inputs override the decoded output: LT (Lamp Test) activates all segments regardless of BCD input — used to check for burned-out LEDs. BI (Blanking Input) deactivates all segments — used for display blanking during multiplexing or for leading zero suppression. When both LT and BI are inactive (HIGH), the segment outputs follow the decoded BCD value. For leading zero suppression: connect the RBI of the most significant digit to GND; if that digit is 0, its segments are blanked AND its RBO goes LOW; connect this RBO to the next digit’s RBI, causing cascading blanking of leading zeros. The 4511 does NOT have a Ripple Blanking Output (RBO) — for ripple blanking, use the CD4543 or handle it with external logic.

Pin Description:CD4511BE Pin Definition and Functions

Pin	Name	Type	Description
1	B	Input	BCD input B (2^1)
2	C	Input	BCD input C (2^2)
3	LT	Input	Lamp test (active LOW, all segments on)
4	BI	Input	Blanking input (active LOW, all segments off)
5	LE	Input	Latch enable (LOW=transparent, HIGH=latched)
6	D	Input	BCD input D (MSB, 2^3)
7	A	Input	BCD input A (LSB, 2^0)
8	VSS	Power	Ground
9	e	Output	Segment e output
10	d	Output	Segment d output
11	c	Output	Segment c output
12	b	Output	Segment b output
13	a	Output	Segment a output
14	g	Output	Segment g output
15	f	Output	Segment f output
16	VDD	Power	Supply (3V to 18V)

Application Scenarios:In which products and applications isCD4511BE used

Single Digit Display: MCU 4-bit BCD → CD4511 inputs D,C,B,A; LE=LOW; 220Ω resistors on a-g; common-cathode display; displays 0-9
Multiplexed 4-Digit: One CD4511; 4 common-cathode displays; digit enable via PNP transistors; MCU scans digits at 100Hz
Counter Display: CD4017 or 74LS90 counter → CD4511 BCD inputs; LE=LOW (transparent); displays count on 7-segment
Latched Display: LE=LOW to load value; then LE=HIGH to freeze display; MCU can change BCD without affecting displayed value

Alternative Models:What chips are recommended as replacements for CD4511BE

Model	Manufacturer	Key Difference	Package	Supply
CD4511BM	TI	SOIC-16 surface-mount version with identical logic function and 3-18V range	SOIC-16	3-18V
CD4511BE	TI	Through-hole DIP version for prototyping and legacy board repair	DIP-16	3-18V
HEF4511BT	NXP	Pin-compatible CMOS version with improved ESD protection and 3-15V supply	SOIC-16	3-15V
MC144511BDR2G	onsemi	Pin-compatible equivalent with RoHS compliance and AEC-Q100 automotive option	SOIC-16	3-18V
74HC4511D	TI/Nexperia	HC CMOS version with higher speed and 2-6V supply for modern logic systems	SOIC-16	2-6V
74HC4511N	TI/Nexperia	HC CMOS through-hole version for prototyping with 2-6V supply range	DIP-16	2-6V
74HCT4511D	Nexperia	HCT version with TTL-compatible inputs for mixed 5V TTL/CMOS systems	SOIC-16	4.5-5.5V

CD4511 is the CMOS 4000-series bcd-to-7-segment latch/decoder/driver operating over the wide 3-18V supply range. The HEF4511 (NXP) and MC144511 (onsemi) are direct pin-compatible equivalents. For higher speed at the cost of narrower voltage range, the 74HC4511 HC/HCT families offer significantly faster propagation delay and lower power consumption at 2-6V. Surface-mount versions use the BM/M suffix (SOIC); through-hole versions use the BE suffix (DIP).