ATECC108A-SSHDA-B from Microchip Tech, in a SOIC-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	NC	unconnected	No connect pin.
2	NC	unconnected	No connect pin.
3	NC	unconnected	No connect pin.
4	GND	power_in	Ground.
5	SDA	bidirectional	Serial data pin for the I2C interface, which supports up to 1MHz, with a pull-up resistor to VCC; input levels are 1.8V to 5.5V IO levels.
6	SCL	input	Serial clock input for the I2C interface, with clock frequency up to 1 MHz.
7	NC	unconnected	No connect pin.
8	VCC	power_in	Power supply, 2.0V to 5.5V operating range.

Key specifications

Parameter	Value
Manufacturer	Microchip Tech
Package	SOIC-8
Category	Single Chip Microcomputer/Microcontroller
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
Power Supply Voltage	VCC	2		5.5	V		8
Ambient Operating Temperature	TA	-40		85	C		8
Active Power Supply Current	ICC		3	6	mA	Waiting for I/O during I/O transfers or execution of non-ECC commands when ChipMode:3 is zero	8
Active Power Supply Current (ECC command)	ICC			16	mA	During ECC command execution	8
Idle Power Supply Current	IIDLE			800	µA	When device is in idle mode, VSDA and VSCL < 0.4V or > VCC, 0.4	8
Sleep Current	ISLEEP		30	150	nA	When device is in sleep mode, VCC ≤ 3.6V, VSDA and VSCL < 0.4V or > VCC, 0.4, TA ≤ 55°C	8
Sleep Current	ISLEEP			2	µA	When device is in sleep mode	8
Output Low Voltage	VOL			0.4	V	When device is in active mode, VCC = 2.5, 5.5V	8
Output Low Current	IOL		4		mA	When device is in active mode, VCC = 2.5, 5.5V, VOL = 0.4V	8
Input Low Voltage	VIL	-0.5		0.5	V	When device is active and TTLenable bit in configuration memory is zero	8
Input High Voltage	VIH	1.5			V	When device is active and TTLenable bit in configuration memory is zero (max VCC + 0.5)	8
Theta JA (SOIC)	ƟJA		166		C/W	SOIC (SSH)	8
Operating Temperature		-40		85	°C		5
Storage Temperature		-65		150	°C		5
Maximum Operating Voltage				6	V		5
DC Output Current				5	mA		5
Voltage on any pin		-0.5			V	-0.5V to (VCC + 0.5V)	5
Write Endurance (Each Byte)		400000			Write Cycles		5
Data Retention (At 55C)		10			Years	At 55C	5
Data Retention (At 35C)		30	50		Years	At 35C	5
Power-Up Delay	tPU	100			µs	To Crypto Authentication	5
Wake Low Duration	tWLO	60			µs	To Crypto Authentication	5
Wake High Delay to Data Comm.	tWHI	500			µs	To Crypto Authentication	5
High Side Glitch Filter at Active	tHIGNORE_A			45	ns	To Crypto Authentication	5
Low Side Glitch Filter at Active	tLIGNORE_A			45	ns	To Crypto Authentication	5
Low Side Glitch Filter at Sleep	tLIGNORE_S	15			µs	To Crypto Authentication	5
Watchdog Timeout	tWATCHDOG	0.7	1.3	1.7	s	To Crypto Authentication	5
SCK Clock Frequency	fSCK			1	MHz	TA = -40°C to +85°C, VCC = +2.0V to +5.5V, CL = 1 TTL Gate and 100pF	7
SCK High Time	tHIGH	400			ns		7
SCK Low Time	tLOW	400			ns		7
Start Setup Time	tSU.STA	250			ns		7
Start Hold Time	tHD.STA	250			ns		7
Stop Setup Time	tSU.STO	250			ns		7
Data In Setup Time	tSU.DAT	100			ns		7
Data In Hold Time	tHD.DAT	0			ns		7
Input Rise Time	tR			300	ns	Based on characterization, not tested	7
Input Fall Time	tF			100	ns	Based on characterization, not tested	7
Clock Low to Data Out Valid	tAA	50		550	ns		7
Data Out Hold Time	tDH	50			ns		7
SMBus Timeout Delay	tTIMEOUT	25		75	ms		7
Bus free time before new transmission	tBUF	500			ns	Based on characterization, not tested	7

CAD (KiCad official)

Symbol: ATECC108A-SSHDA-B
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)
3D model files: atecc108a-sshda-b-etched.step / atecc108a-sshda-b-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atecc108a-sshda-b.step / atecc108a-sshda-b.glb are the bare package body.

Provenance

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

Datasheet: Microchip Tech datasheet (14 pp, sha256 b6c9ad37653156e2, retrieved 2026-10-30, tier: manufacturer)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-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

ATECC108A-SSHDA-B

Verified ATECC108A-SSHDA-B

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

README