CD4543BM from HGSEMI, in a SOP-16. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	LD	input	Latch Disable input. When LD = 1 the BCD inputs (A-D) are passed through to the decoder; when LD = 0 the last BCD code is stored in the 4-bit latch and the outputs are frozen.
2	C	input	BCD data input, bit C (weight 4) of the 8421 BCD code. CMOS logic input referenced to VSS/VDD.
3	B	input	BCD data input, bit B (weight 2) of the 8421 BCD code. CMOS logic input referenced to VSS/VDD.
4	D	input	BCD data input, bit D (weight 8, MSB) of the 8421 BCD code. CMOS logic input referenced to VSS/VDD.
5	A	input	BCD data input, bit A (weight 1, LSB) of the 8421 BCD code. CMOS logic input referenced to VSS/VDD.
6	Ph	input	Phase input. For LCD readouts apply a square wave (VSS to VDD) common with the backplane drive. For common-cathode LED select Ph = 0; for common-anode LED select Ph = 1 to invert the segment output combinations.
7	BI	input	Blanking input. When BI = 1 all seven segment outputs (a-g) are forced to the blank state (all 0 with Ph = 0). Normal decode occurs when BI = 0.
8	VSS	power_in	Negative supply / ground reference. Tied to 0 V in single-supply operation.
9	a	output	Seven-segment decoded output 'a'. Directly drives an LCD/LED/VF segment; polarity is set by the Ph input.
10	b	output	Seven-segment decoded output 'b'. Directly drives an LCD/LED/VF segment; polarity is set by the Ph input.
11	c	output	Seven-segment decoded output 'c'. Directly drives an LCD/LED/VF segment; polarity is set by the Ph input.
12	d	output	Seven-segment decoded output 'd'. Directly drives an LCD/LED/VF segment; polarity is set by the Ph input.
13	e	output	Seven-segment decoded output 'e'. Directly drives an LCD/LED/VF segment; polarity is set by the Ph input.
14	g	output	Seven-segment decoded output 'g' (middle segment). Directly drives an LCD/LED/VF segment; polarity is set by the Ph input.
15	f	output	Seven-segment decoded output 'f'. Directly drives an LCD/LED/VF segment; polarity is set by the Ph input.
16	VDD	power_in	Positive supply pin. Recommended operating range 3.0 V to 15 V (absolute max 18 V).

Key specifications

Parameter	Value
Manufacturer	HGSEMI
Package	SOP-16
Category	LED-drv
Pins	16

Ordering variants

Same part, different packaging or reel option.

CD4543BMBE
CD4543BMBN
CD4543BM/TR
CD4543BMT/TR
CD4543BMBLQ/TR

CAD (KiCad official)

Symbol: CD4543BM
Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
3D model: SOP-16 (KiCad packages3D, STEP)

Provenance

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

Datasheet: HGSEMI datasheet (12 pp, sha256 e4c42b550d773708, retrieved 2026-08-17, tier: lcsc)
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