MAX31856MUD+T from Analog Devices Inc Maxim Integrated, in a TSSOP-14. 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	AGND	power_in	Analog ground. Return for the analog supply (AVDD) and the analog front-end referenced to this pin.
2	BIAS	output	Bias voltage source, nominally 0.735V with ~2kΩ output resistance. Provides common-mode bias for the thermocouple inputs; floats when no conversions are taking place.
3	T-	input	Thermocouple negative input. Connects to the negative wire of the thermocouple; internally protected to ±45V.
4	T+	input	Thermocouple positive input. Connects to the positive wire of the thermocouple; internally protected to ±45V.
5	AVDD	power_in	Analog positive supply, 3.0V to 3.6V (3.3V nominal). Bypass with a 0.1µF capacitor to AGND. Must be within ±100mV of DVDD.
6	DNC	unconnected	Do Not Connect. Leave this pin floating; do not tie to any signal or supply rail.
7	DRDY	output	Active-low data ready output. Asserts low when a new conversion result is available in the Linearized Thermocouple Temperature register; returns high after a read of that register (or the Cold-Junction register when enabled).
8	DVDD	power_in	Digital positive supply, 3.0V to 3.6V (3.3V nominal). Bypass with a 0.1µF capacitor to DGND. Must be within ±100mV of AVDD.
9	CS	input	Active-low SPI chip select. Drive low to initiate a SPI transfer and enable the serial interface; drive high to terminate the transfer and place SDO in high impedance.
10	SCK	input	SPI serial clock input, up to 5MHz. Either polarity (CPOL=0 or 1) is supported; CPHA must be set to 1.
11	SDO	tri_state	SPI serial data output (MISO). Shifts data out MSB-first on the SCLK strobe edge when CS is low; high impedance when CS is high.
12	SDI	input	SPI serial data input (MOSI). Address and write-data bytes are latched MSB-first on the SCLK strobe edge while CS is low.
13	FAULT	output	Active-low fault output. Asserts when a cable open-circuit, thermocouple over/undervoltage, or a temperature threshold (linearized thermocouple or cold-junction) fault is detected, unless masked by the fault mask register.
14	DGND	power_in	Digital ground. Return for the digital supply (DVDD) and the SPI/logic pins.

Key specifications

Parameter	Value
Manufacturer	Analog Devices Inc Maxim Integrated
Package	TSSOP-14
Category	Data Acquisition
Pins	14

Ordering variants

Same part, different packaging or reel option.

MAX31856MUD+T

CAD (KiCad official)

Symbol: MAX31856MUD+T
Footprint: Package_SO:TSSOP-14_4.4x5mm_P0.65mm
3D model: TSSOP-14 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Analog Devices Inc Maxim Integrated datasheet (30 pp, sha256 385702a94433d75e, 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