AT24C128C-XHM-B from Microchip Tech, in a TSSOP-8. 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	A0	input	Device address input hard-wired to GND or VCC; if left floating it is internally pulled down, and Microchip recommends connecting it to a known state with any pull-up resistor of 10 kΩ or less.
2	A1	input	Device address input hard-wired to GND or VCC for multi-device addressing (up to eight devices on one bus); if left floating it is internally pulled down, and Microchip recommends a known state with any pull-up resistor of 10 kΩ or less.
3	A2	input	Device address input hard-wired to GND or VCC for multi-device addressing (up to eight devices on one bus); if left floating it is internally pulled down, and Microchip recommends a known state with any pull-up resistor of 10 kΩ or less.
4	GND	power_in	Ground reference for the power supply, to be connected to the system ground.
5	SDA	bidirectional	Open-drain bidirectional serial data pin that must be pulled high with an external pull-up resistor not exceeding 10 kΩ and may be wire-ORed with other open-drain devices.
6	SCL	input	Serial clock input: SDA data is latched on the rising edge of SCL and clocked out on the falling edge, and SCL must be held high when the bus is idle or pulled high with an external resistor.
7	WP	input	Write-protect input: connecting it to GND allows normal writes, while connecting it to VCC inhibits writes to the protected memory (full array); if left floating it is internally pulled down, and Microchip recommends a known state with any pull-up resistor of 10 kΩ or less.
8	VCC	power_in	Device power supply pin; operation at invalid VCC voltages may produce spurious results (Grade 1: 2.5 V to 5.5 V, Grade 3: 1.7 V to 5.5 V per page 1).

Key specifications

Parameter	Value
Manufacturer	Microchip Tech
Package	TSSOP-8
Category	Interface ICs
Pins	8

Electrical characteristics

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

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Operating Temperature (Case)		-40		125	°C	Automotive Grade 1	9
Operating Temperature (Case)		-40		85	°C	Automotive Grade 3	9
VCC Power Supply		2.5		5.5	V	Grade 1	9
VCC Power Supply		1.7		5.5	V	Grade 3	9
Temperature under bias		-55		125	°C		9
Storage temperature		-65		150	°C		9
VCC supply voltage (absolute maximum)	VCC			6.25	V		9
Voltage on any pin with respect to ground		-1		7	V		9
DC output current				5	mA		9
Time required after VCC is stable before the device can accept commands	tPUP	100			µs		11
Minimum time at VCC = 0V between power cycles	tPOFF	500			ms		11
Power-on Reset Threshold Voltage	VPOR			1.5	V		11
Supply Voltage	VCC1	2.5		5.5	V	Grade 1	9
Supply Voltage	VCC2	1.7		5.5	V	Grade 3	9
Supply Current (read)	ICC1		0.4	1	mA	VCC = 5.0V, Read at 400 kHz	9
Supply Current (write)	ICC2		2	3	mA	VCC = 5.0V, Write at 400 kHz	9
Standby Current	ISB		0.1	3	μA	VCC = 1.7V, VIN = VCC or GND	9
Standby Current	ISB		1.6	4	μA	VCC = 2.5V, VIN = VCC or GND	9
Standby Current	ISB		4	6	μA	VCC = 5.0V, VIN = VCC or GND	9
Input Leakage Current	ILI		0.1	3	μA	VIN = VCC or GND	9
Output Leakage Current	ILO		0.05	3	μA	VOUT = VCC or GND	10
Input Low Level (min as printed)	VIL	-0.6			V	Note 2	10
Input Low Level (max as printed: VCC x 0.3; value 0.3 in x VCC)	VIL			0.3	x VCC	Note 2	10
Input High Level (min as printed: VCC x 0.7; value 0.7 in x VCC)	VIH	0.7			x VCC	Note 2	10
Input High Level (max as printed: VCC + 0.5; value 0.5 added to VCC)	VIH			0.5	V (added to VCC)	Note 2	10
Output Low Level	VOL1			0.2	V	VCC = 1.7V, IOL = 0.15 mA	10
Output Low Level	VOL2			0.4	V	VCC = 2.5V, IOL = 2.1 mA	10
Input/Output Capacitance (SDA)	CI/O			8	pF	VI/O = 0V	12
Input Capacitance (A0, A1, A2 and SCL)	CIN			6	pF	VIN = 0V	12
Write Endurance		1e+06			Write Cycles	TA = 25°C, VCC = 5.0V, Page Write mode	12
Data Retention		100			Years	TA = 55°C	12
Clock Frequency, SCL	fSCL			100	kHz	Column pair 1 (100 kHz column)	10
Clock Frequency, SCL	fSCL			400	kHz	Column pair 2 (400 kHz column)	10
Clock Pulse Width Low	tLOW	4700			ns	Column pair 1	10
Clock Pulse Width Low	tLOW	1200			ns	Column pair 2	10
Clock Pulse Width High	tHIGH	4000			ns	Column pair 1	10
Clock Pulse Width High	tHIGH	600			ns	Column pair 2	10
Noise Suppression Time	tI			100	ns	Column pair 1	10
Noise Suppression Time	tI			50	ns	Column pair 2	10
Clock Low to Data Out Valid	tAA			4500	ns	Column pair 1	10
Clock Low to Data Out Valid	tAA	100		900	ns	Column pair 2	10
Bus Free Time between Stop and Start	tBUF	4700			ns	Column pair 1	10
Bus Free Time between Stop and Start	tBUF	1200			ns	Column pair 2	10
Start Hold Time	tHD.STA	4000			ns	Column pair 1	10
Start Hold Time	tHD.STA	600			ns	Column pair 2	10
Start Set-Up Time	tSU.STA	4700			ns	Column pair 1	10
Start Set-Up Time	tSU.STA	600			ns	Column pair 2	10
Data In Hold Time	tHD.DAT	0			ns	Column pair 1	10
Data In Set-up Time	tSU.DAT	200			ns	Column pair 1	10
Data In Set-up Time	tSU.DAT	100			ns	Column pair 2	10
Inputs Rise Time	tR			1000	ns	Column pair 1	10
Inputs Rise Time	tR			300	ns	Column pair 2	10
Inputs Fall Time	tF			300	ns	Column pair 1	10
Stop Set-Up Time	tSU.STO	4700			ns	Column pair 1	10
Stop Set-Up Time	tSU.STO	600			ns	Column pair 2	10
Data Out Hold Time	tDH	100			ns	Column pair 1	10
Data Out Hold Time	tDH	50			ns	Column pair 2	10
Write Cycle Time	tWR			5	ms	Column pair 1	10

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part	Material	Colour / plating	Datasheet says	Page
contacts		tin	8-Lead Plastic Small Outline (SN) - Narrow, 3.90 mm (.150 In.) Body [SOIC] © 2020 Microchip Technology Inc.	25

CAD (KiCad official)

Symbol: AT24C128C-XHM-B
Footprint: Package_SO:TSSOP-8_4.4x3mm_P0.65mm
3D model: TSSOP-8 (KiCad packages3D, STEP)
3D model files: at24c128c-xhm-b-etched.step / at24c128c-xhm-b-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); at24c128c-xhm-b.step / at24c128c-xhm-b.glb are the bare package body.

Provenance

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

Datasheet: Microchip Tech datasheet (38 pp, sha256 246bfb745ffa84e6, 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

AT24C128C-XHM-B

Verified AT24C128C-XHM-B

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

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