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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Nexperia USA Inc. SZMM3Z20VT1GX

Name: SZMM3Z20VT1GX
Brand: Nexperia USA Inc.
SKU: SZMM3Z20VT1GX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SZMM3Z20VT1GX

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: SC-76, SOD-323

Datasheet:: SZMM3Z20VT1GX.pdf

Description:: DIODE ZENER 20V 300MW SOD323

Quantity:: RFQ Add To RFQ list

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Inventory:22,789

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Product details

Overview

SZMM3Z20VT1GX from Nexperia is a Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision voltage reference and overvoltage protection in low-power circuits. It provides a nominal 20 V Zener voltage at 5 mA, with ±5 % tolerance, 15 Ω differential resistance, and AEC-Q101 qualification for automotive use.

For engineers reviewing the SZMM3Z20VT1GX datasheet, SZMM3Z20VT1GX pinout, SZMM3Z20VT1GX application, or SZMM3Z20VT1GX equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (R_th(j-a) = 415 K/W), junction temperature limit (150 °C), and non-repetitive surge capability (40 W @ 100 µs).

Technical Context

This device operates as a two-terminal shunt regulator, maintaining stable output voltage by conducting reverse current above its specified Zener breakdown threshold. Its low 15 Ω differential resistance ensures minimal voltage deviation under load variation, while the −0.05 mV/K temperature coefficient near 20 V enables predictable drift behavior across temperature.

The SOD323 package supports high-density PCB layouts and reflow/wave soldering per JEDEC standards. Thermal performance is characterized with R_th(j-sp) = 110 K/W to cathode solder point, enabling reliable operation up to 150 °C junction temperature when mounted on standard FR4 with single-sided copper.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	18.86 V to 21.08 V at I_Z = 5 mA - defines regulation band for stable reference generation
Differential Resistance (r_diff)	15 Ω max - determines output impedance and load regulation error
Power Dissipation (P_tot)	300 mW at T_amb = 25 °C - sets continuous DC power handling on standard FR4 PCB
Non-repetitive Peak Power (P_ZSM)	40 W for 100 µs square wave - supports transient overvoltage clamping without failure
Forward Voltage (V_F)	1.1 V max at I_F = 100 mA - limits forward conduction loss during polarity reversal events
Junction Temperature (T_j)	150 °C max - defines upper thermal operating limit for reliability in automotive environments
AEC-Q101 Qualified	Yes - validated for automotive-grade stress testing including HTGB, HTRB, and temperature cycling

Pinout & Package

Package: SOD323 (SC-76), surface-mount plastic package with 2 leads, 1.35 mm × 0.85 mm footprint, 0.45 mm height, cathode marked by bar on top surface.

Pin/Terminal	Circuit Role	Design Meaning
1	Cathode (K)	Connected to regulated output node; carries reverse Zener current during regulation
2	Anode (A)	Connected to ground or lower-potential rail; completes shunt regulation path

Key Features

Feature	Design Value
Low differential resistance	15 Ω max at 5 mA - improves regulation stability against load current changes
AEC-Q101 qualification	Validated for automotive applications - meets stress test requirements for HTGB, HTRB, and ESD
Small-footprint SOD323 package	1.35 mm × 0.85 mm - enables high-density routing in space-constrained modules like ADAS sensors
Wide Zener voltage range	2.4 V to 75 V series coverage - allows single-package-family sourcing across diverse supply rails
Low temperature coefficient	−0.05 mV/K near 20 V - minimizes voltage drift over −55 °C to +150 °C ambient range

Applications

Automotive Sensor Reference

Industrial Power Monitor

Use Scenario: Providing stable 20 V reference for analog front-end of engine knock sensor signal conditioning circuit.

IC Role / Device Role / Timing Role: Shunt voltage reference for ADC biasing and op-amp feedback network.

Use Value: Enables <±10 mV reference accuracy over −40 °C to +125 °C, meeting ASIL-B functional safety margin.

Use Scenario: Clamping overvoltage transients on 24 V industrial PLC input channel during EFT bursts.

IC Role / Device Role / Timing Role: Transient voltage suppressor protecting downstream optocoupler and MCU GPIO.

Use Value: Absorbs 40 W surge energy within 100 µs without degradation, preserving signal integrity during IEC 61000-4-4 testing.

Consumer USB-C PD Feedback

Medical Battery Management

Use Scenario: Setting precise 20 V feedback threshold in USB-C Power Delivery adapter secondary-side controller.

IC Role / Device Role / Timing Role: Zener-based voltage divider element for isolated feedback loop.

Use Value: Maintains ±5 % regulation tolerance across 0–70 °C, ensuring compliance with USB PD 3.1 voltage negotiation specs.

Use Scenario: Overvoltage cutoff reference in lithium-ion battery pack protection IC for 4S configuration (nominal 14.8 V).

IC Role / Device Role / Timing Role: Precision voltage threshold detector triggering cell balancing shutdown.

Use Value: Delivers 15 Ω dynamic impedance to minimize hysteresis error in comparator input stage, improving SOC estimation fidelity.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX384-B20,115 (Nexperia)	Same 20 V nominal, but SOD323 package with tighter ±2 % tolerance and lower 10 Ω r_diff	Higher precision required in metrology-grade references; not AEC-Q101 qualified	Select when ±2 % tolerance and sub-10 Ω impedance outweigh automotive qualification needs
MMSZ5249BT1G (ON Semiconductor)	20 V nominal, SOD-123 package, ±5 % tolerance, 23 Ω r_diff, no AEC-Q101 rating	Larger 2.7 mm × 1.6 mm footprint; suitable for non-automotive consumer boards with less stringent thermal constraints	Choose for cost-sensitive industrial designs where AEC-Q101 is unnecessary and board space permits larger package

Compared with BZX384-B20,115, SZMM3Z20VT1GX trades tighter tolerance for automotive qualification and higher surge robustness; versus MMSZ5249BT1G, it delivers superior thermal resistance (415 vs. 500 K/W) and smaller footprint, critical for automotive ECU miniaturization.

Availability

SZMM3Z20VT1GX is available at Aetrix Electronics and suitable for automotive sensor modules, industrial power monitors, USB-C PD adapters, and medical battery management systems requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for SZMM3Z20VT1GX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert focused on high-performance, reliable discrete, logic, and MOSFET devices, serving automotive, industrial, and consumer markets with scalable manufacturing and rigorous quality systems.

The SZMM3Z series targets automotive-grade Zener regulation, delivering AEC-Q101-compliant voltage references in ultra-small SOD323 packages for next-generation ECUs, ADAS sensors, and electrified powertrain subsystems.

FAQ

What is the maximum continuous power dissipation for SZMM3Z20VT1GX at 85 °C ambient?

At 85 °C ambient, derated power dissipation is 210 mW, calculated using P_tot(T_amb) = P_tot(25 °C) × [1 − (T_amb − 25)/125], based on 300 mW rating at 25 °C and 150 °C max junction temperature. This ensures safe operation without exceeding thermal limits on standard FR4 PCBs.

Does SZMM3Z20VT1GX support bidirectional ESD protection?

No - it is a unidirectional Zener diode optimized for reverse-biased regulation and clamping. Its forward voltage is 1.1 V at 100 mA, but it lacks symmetric breakdown characteristics required for bidirectional TVS functionality. For ESD protection, dedicated bidirectional TVS diodes such as PESD5V0S1BA should be used instead.

How does the marking code 'XC' correspond to SZMM3Z20VT1GX?

'XC' is the unique top-side laser marking for SZMM3Z20VT1GX per Nexperia's official marking table. It appears adjacent to the cathode bar on the SOD323 package and is used for visual identification and traceability during assembly and inspection - no decoding or interpretation is required beyond matching to the part number.

Can SZMM3Z20VT1GX replace older MMBZ5249B in existing designs?

Yes, with validation - both regulate at ~20 V and share SOD-323/SOD323 footprint compatibility, but SZMM3Z20VT1GX offers AEC-Q101 qualification, lower r_diff (15 Ω vs. 23 Ω), and improved thermal resistance (415 K/W vs. 500 K/W). Layout remains identical; requalification is recommended for automotive deployments.

SZMM3Z20VT1GX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: SC-76, SOD-323

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 20 V

Tolerance:: ±5%

Power - Max:: 300 mW

Impedance (Max) (Zzt):: 20 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 15 V

Voltage - Forward (Vf) (Max) @ If:: 1.1 V @ 100 mA

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-323

SZMM3Z20VT1GX FAQ

1.How can I place an order for SZMM3Z20VT1GX through Aetrix?

Please submit a Request for Quotation (RFQ) for SZMM3Z20VT1GX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SZMM3Z20VT1GX reliable?

The price and inventory of SZMM3Z20VT1GX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z20VT1GX is usually 5 days.

3.What payment methods are accepted for SZMM3Z20VT1GX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z20VT1GX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SZMM3Z20VT1GX?

SZMM3Z20VT1GX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SZMM3Z20VT1GX order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SZMM3Z20VT1GX?

For technical support, including SZMM3Z20VT1GX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z20VT1GX requirements.

6.How does Aetrix verify that SZMM3Z20VT1GX is sourced from the original manufacturer or authorized distributors?

All SZMM3Z20VT1GX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SZMM3Z20VT1GX meets industry standards.

7.What is the process for return or replacement of SZMM3Z20VT1GX?

All SZMM3Z20VT1GX units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z20VT1GX, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SZMM3Z20VT1GX part is unused and in its original packaging.

Return procedure for SZMM3Z20VT1GX:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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