A BCD-to-7-segment latch, decoder, and driver in one SOIC-16, the simplest way to put a digit on a common-cathode 7-segment LED display. Feed it a 4-bit BCD value (A-D) and it lights the right segments (a-g) with enough drive to run the LEDs directly, no series-transistor stage needed. A latch-enable pin freezes the displayed digit while the inputs change, a lamp-test input lights all segments to check the display, and a blanking input turns the digit off (useful for leading-zero suppression). Runs 3-18 V.

Pinout

Pin	Name	Type	Function
1	B	input	BCD data input bit B (weight 2). CMOS-level input latched on rising edge of LE.
2	C	input	BCD data input bit C (weight 4). CMOS-level input latched on rising edge of LE.
3	LT	input	Lamp Test (active low). When LT = 0 (with BL = 1), all seven segment outputs a-g are forced high to illuminate every segment for display test regardless of BCD inputs.
4	BL	input	Blanking input (active low). When BL = 0 (with LT = 1), all seven segment outputs are forced low, blanking the display for intensity modulation/strobe applications.
5	LE/STROBE	input	Latch Enable / Strobe. When LE = 0, BCD input data flows through the latch transparently; on LE = 1 the currently-latched BCD code is held and decoded regardless of subsequent input changes.
6	D	input	BCD data input bit D (MSB, weight 8). CMOS-level input latched on rising edge of LE.
7	A	input	BCD data input bit A (LSB, weight 1). CMOS-level input latched on rising edge of LE.
8	VSS	power_in	Negative supply / ground reference (0 V). Common return for the BCD input latch, decoder logic, and segment driver emitters.
9	e	output	Seven-segment driver output for segment e. Active-high n-p-n bipolar sourcing output capable of driving up to 25 mA into a common-cathode LED segment.
10	d	output	Seven-segment driver output for segment d. Active-high sourcing output (up to 25 mA) for common-cathode display drive.
11	c	output	Seven-segment driver output for segment c. Active-high sourcing output (up to 25 mA) for common-cathode display drive.
12	b	output	Seven-segment driver output for segment b. Active-high sourcing output (up to 25 mA) for common-cathode display drive.
13	a	output	Seven-segment driver output for segment a. Active-high sourcing output (up to 25 mA) for common-cathode display drive.
14	g	output	Seven-segment driver output for segment g (center bar). Active-high sourcing output (up to 25 mA) for common-cathode display drive.
15	f	output	Seven-segment driver output for segment f. Active-high sourcing output (up to 25 mA) for common-cathode display drive.
16	VDD	power_in	Positive supply voltage. Operating range 3-18 V (absolute max VSS−0.5 V to +20 V). Decoupling with a 100 nF ceramic close to the pin is recommended.

Key specifications

Parameter	Value
Type	BCD-to-7-segment decoder/driver
Inputs	4-bit BCD (A-D)
Outputs	7 segments (a-g), direct LED drive
Display type	common-cathode
Controls	latch enable, lamp test, blanking
Logic family	4000B CMOS
Supply voltage	3-18 V
Package	SOIC-16

Ordering variants

Same part, different packaging or reel option.

CD4511BM (SOIC-16, tube)
CD4511BM96 (SOIC-16, tape & reel)

CAD (KiCad official)

Symbol: CD4511B (generated from datasheet; KiCad has no symbol)
Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
3D model: SOIC-16 (KiCad packages3D)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Texas Instruments datasheet (19 pp, sha256 64e032d04d526047, retrieved 2026-08-17, tier: manufacturer)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF