BUF16821AIPWPR from Texas Instruments, in a HTSSOP-28. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	VCOM2	output	VCOM channel 2 output, one of the two programmable VCOM channels.
2	OUT1	output	DAC output 1, a rail-to-rail gamma channel.
3	OUT2	output	DAC output 2, a rail-to-rail gamma channel.
4	OUT3	output	DAC output 3, a rail-to-rail gamma channel.
5	OUT4	output	DAC output 4, a rail-to-rail gamma channel.
6	OUT5	output	DAC output 5, a rail-to-rail gamma channel.
7	OUT6	output	DAC output 6, a rail-to-rail gamma channel.
8	GNDA	power_in	Analog ground; must be connected to digital ground (GNDD).
9	VS	power_in	Analog supply; connect to the analog supply, operating range 9 V to 20 V.
10	OUT7	output	DAC output 7, a rail-to-rail gamma channel.
11	OUT8	output	DAC output 8, a rail-to-rail gamma channel.
12	OUT9	output	DAC output 9, a rail-to-rail gamma channel.
13	VSD	power_in	Digital supply; connect to the logic supply, operating range 2.0 V to 5.5 V.
14	SCL	input	Serial clock input; open-drain, connect to a pull-up resistor.
15	SDA	bidirectional	Serial data I/O; open-drain, connect to a pull-up resistor.
16	A0	input	A0 address pin for the I2C address; connect to either logic 1 or logic 0 (see Table 1).
17	BKSEL	input	Selects memory bank 0 or 1; connect to logic 1 to select bank 1 or logic 0 to select bank 0.
18	GNDD	power_in	Digital ground; must be connected to analog ground at the BUF16821.
19	OUT10	output	DAC output 10, a rail-to-rail gamma channel.
20	OUT11	output	DAC output 11, a rail-to-rail gamma channel.
21	OUT12	output	DAC output 12, a rail-to-rail gamma channel.
22	OUT13	output	DAC output 13, a rail-to-rail gamma channel.
23	VS	power_in	Analog supply; connect to the analog supply, operating range 9 V to 20 V.
24	GNDA	power_in	Analog ground; must be connected to digital ground (GNDD).
25	OUT14	output	DAC output 14, a rail-to-rail gamma channel.
26	OUT15	output	DAC output 15, a rail-to-rail gamma channel.
27	OUT16	output	DAC output 16, a rail-to-rail gamma channel.
28	VCOM1	output	VCOM channel 1 output, one of the two programmable VCOM channels.
29	EP	passive	Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	HTSSOP-28
Category	Amplifiers/Comparators
Pins	29

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Output Swing High (OUT1-16)		17.7	17.85		V	Code = 1023, Sourcing 10mA	3
Output Swing Low (OUT1-16)			0.07	0.3	V	Code = 0, Sinking 10mA	3
VCOM1,2 Output Swing High (BUF16821A)		13	16.2		V	Code = 1023, Sourcing 100mA	3
VCOM1,2 Output Swing Low (BUF16821A)			0.6	2	V	Code = 0, Sinking 100mA	3
Continuous Output Current				30	mA	Note (2)	3
Output Accuracy		-50		50	mV		3
Output Accuracy vs Temperature		-25		25	μV/°C	Code 512	3
Integral Nonlinearity	INL		0.3		LSB		3
Differential Nonlinearity	DNL		0.3		LSB		3
Load Regulation			0.5	1.5	mV/mA	REG Code 512 or VCC/2, IOUT = +5mA to -5mA Step	3
Number of OTP Write Cycles				16	Cycles		3
Memory Retention				100	Years		3
Analog Supply Operating Range		9		20	V		3
Total Analog Supply Current	IS		12	14	mA	Outputs at Reset Values, No Load	3
Total Analog Supply Current over temperature	IS			18	mA	Over Temperature	3
Logic 0 Output Voltage	VOL		0.15	0.4	V	ISINK = 3mA	3
Input Leakage		-10		10	μA		3
Clock Frequency Standard/Fast Mode	fCLK			400	kHz	Standard/Fast Mode	3
Clock Frequency High-Speed Mode	fCLK			3.4	MHz	High-Speed Mode	3
Digital Supply Operating Range	VSD	2		5.5	V		3
Digital Supply Current	ISD		115	150	μA	Outputs at Reset Values, No Load, Two-Wire Bus Inactive	3
Digital Supply Current over temperature	ISD			115	μA	Over Temperature	3
Specified Temperature Range		-40		85	°C	Specified Range	3
Operating Junction Temperature Range		-40		95	°C	Junction Temperature < +125°C	3
Storage Temperature Range		-65		150	°C	Storage Range	3
Thermal Resistance Junction-to-Ambient	θJA		40		°C/W	HTSSOP-28, See Note (3)	3
Supply Voltage VS	VS			22	V		2
Supply Voltage VSD	VSD			6	V		2
Digital Input Pins Voltage (SCL, SDA, AO, BKSEL)		-0.5		6	V		2
Digital Input Pins Current (SCL, SDA, AO, BKSEL)		-10		10	mA		2
Ambient Operating Temperature		-40		95	°C		2
Ambient Storage Temperature		-65		150	°C		2
Junction Temperature	TJ			125	°C		2
ESD Human Body Model	HBM			3000	V		2
ESD Charged Device Model	CDM			1000	V		2
ESD Machine Model	MM			200	V		2

CAD (KiCad official)

Symbol: BUF16821AIPWPR
Footprint: Package_SO:TSSOP-28-1EP_4.4x9.7mm_P0.65mm_EP2.85x6.7mm
3D model: HTSSOP-28 (KiCad packages3D, STEP)
3D model files: buf16821aipwpr-etched.step / buf16821aipwpr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); buf16821aipwpr.step / buf16821aipwpr.glb are the bare package body.

Provenance

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

Datasheet: Texas Instruments datasheet (29 pp, sha256 6f35fd53b4597964, retrieved 2026-11-05, tier: manufacturer)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF

BUF16821AIPWPR

Verified BUF16821AIPWPR

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

README