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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206

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SZMM3Z20VT1GX

Nexperia · Zener Diodes · SOD-323

SZMM3Z20VT1GX from Nexperia, in a SOD-323. 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	K	passive	Cathode; the marking bar on the package indicates the cathode.
2	A	passive	Anode of the Zener diode.

Key specifications

Parameter	Value
Manufacturer	Nexperia
Package	SOD-323
Category	Diodes
Pins	2

Electrical characteristics

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

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Working voltage (min)	VZ	18.86			V	IZ = 5 mA (Table 8 column header); Tj = 25 °C unless otherwise specified	4
Working voltage (max)	VZ			21.08	V	IZ = 5 mA (Table 8 column header); Tj = 25 °C unless otherwise specified	4
Tolerance series		-5		5	%	Printed as 'Approximately ± 5 %' (Features and benefits)	1
Total power dissipation	Ptot			300	mW	Tamb = 25 °C; device mounted on FR4 PCB, single-sided copper, standard footprint	3
Non-repetitive peak reverse power dissipation	PZSM			40	W	tp = 100 µs; square wave; Tamb = 25 °C; prior to surge	3
Differential resistance	rdiff			0.05	Ω	IZ = 5 mA (Table 8 column header)	4
Temperature coefficient (min)	SZ	14.4			mV/K	IZ = 5 mA (Table 8 column header)	4
Temperature coefficient (max)	SZ			18	mV/K	IZ = 5 mA (Table 8 column header)	4
Reverse current	IR			100	µA	IZ = 0.5 mA; VR = 15.0 V	4
Reverse current	IR			20	µA	IZ = 5 mA; VR = 15.0 V	4
Diode capacitance	Cd			88	pF	f = 1 MHz; VR = 0 V	4
Forward voltage	VF			0.9	V	IF = 10 mA; pulse test tp ≤ 300 µs; δ ≤ 0.02	3
Forward voltage	VF			1.1	V	IF = 100 mA; pulse test tp ≤ 300 µs; δ ≤ 0.02	3
Forward current	IF			200	mA		3
Junction temperature	Tj			150	°C		3
Ambient temperature	Tamb	-55		150	°C		3
Storage temperature	Tstg	-65		150	°C		3
Thermal resistance junction to ambient	Rth(j-a)			415	K/W	in free air; device mounted on FR4 PCB, single-sided copper, standard footprint	3
Thermal resistance junction to solder point	Rth(j-sp)			110	K/W	soldering point of cathode tab	3
Nominal working voltage	VZ		20		V	Nominal voltage of SZMM3Z20VT1G (type designation 20V)	2

CAD (KiCad official)

Symbol: SZMM3Z20VT1GX
Footprint: Diode_SMD:D_SOD-323
3D model: SOD-323 (KiCad packages3D, STEP)
3D model files: szmm3z20vt1gx-etched.step / szmm3z20vt1gx-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); szmm3z20vt1gx.step / szmm3z20vt1gx.glb are the bare package body.

Provenance

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

Datasheet: Nexperia datasheet (12 pp, sha256 97ec17023363288c, retrieved 2026-10-23, tier: lcsc)
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