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

Nexperia USA Inc. SZMM3Z3V3T1GX

Name: SZMM3Z3V3T1GX
Brand: Nexperia USA Inc.
SKU: SZMM3Z3V3T1GX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SZMM3Z3V3T1GX

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: SC-76, SOD-323

Datasheet:: SZMM3Z3V3T1GX.pdf

Description:: DIODE ZENER 3.3V 300MW SOD323

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Product details

Overview

SZMM3Z3V3T1GX from Nexperia is a general-purpose Zener diode in SOD323 (SC-76) package, rated for 3.3 V nominal Zener voltage at 5 mA, with ±5 % tolerance, 5.0 Ω differential resistance, and AEC-Q101 qualification for automotive use. It delivers stable voltage regulation in low-power biasing, reference, and overvoltage protection circuits.

For engineers reviewing the SZMM3Z3V3T1GX datasheet, SZMM3Z3V3T1GX pinout, SZMM3Z3V3T1GX application, or SZMM3Z3V3T1GX equivalent, this page provides verified electrical characteristics, thermal performance data, SOD323 footprint details, and automotive-grade reliability context essential for precision analog design and automotive electronics qualification.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable 3.3 V reference across load variations, with low dynamic impedance (5.0 Ω at I_Z = 5 mA) ensuring minimal output deviation under current shifts. Its temperature coefficient is −3.5 mV/K, enabling predictable drift behavior in ambient ranges from −55 °C to +150 °C.

Designed for surface-mount applications on FR4 PCBs, it supports pulsed non-repetitive surge handling up to 40 W (t_p = 100 µs), while continuous power dissipation is limited to 300 mW at T_amb = 25 °C. The cathode-marked SOD323 package ensures unambiguous polarity during automated placement.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	3.10 V to 3.50 V at I_Z = 5 mA - defines tight regulation window for 3.3 V rail referencing
Differential Resistance (r_diff)	5.0 Ω max at I_Z = 5 mA - ensures < ±16.5 mV output shift per ±82.5 mA load change
Reverse Current (I_R)	≤ 1000 µA at V_R = 2.7 V - confirms sharp knee and low leakage below breakdown
Forward Voltage (V_F)	1.1 V max at I_F = 100 mA - enables reliable forward conduction for dual-direction clamping
Thermal Resistance (R_th(j-a))	415 K/W - limits junction rise to ~125 °C at full 300 mW dissipation on standard FR4
Temperature Coefficient (S_Z)	−3.5 mV/K - allows accurate drift compensation in temperature-sensitive references
AEC-Q101 Qualified	Yes - validated for automotive underhood and infotainment systems per stress test requirements

Pinout & Package

Package: SOD323 (SC-76), plastic surface-mounted, 2-lead, 1.35 mm × 0.85 mm × 0.45 mm body, cathode marked by bar on top surface.

Pin/Terminal	Circuit Role	Design Meaning
1	Cathode (K)	Connected to regulated output node; marking bar identifies this terminal for correct PCB orientation
2	Anode (A)	Connected to ground or lower-potential rail; forms reverse-biased junction for Zener operation

Key Features

Feature	Design Value
Low differential resistance	5.0 Ω max ensures high regulation accuracy under varying load currents
AEC-Q101 qualification	Validated for automotive environments including thermal cycling, humidity, and mechanical shock
Small SOD323 footprint	1.35 mm × 0.85 mm saves board space in compact consumer and ADAS modules
±5 % Zener tolerance	Guarantees 3.10–3.50 V range at 5 mA, supporting precise 3.3 V system referencing
Non-repetitive surge capability	Withstands 40 W pulses (100 µs square wave), protecting downstream circuitry from transients

Applications

Automotive Sensor Biasing

USB Port Overvoltage Clamp

Use Scenario: Providing stable 3.3 V bias to MEMS pressure sensors in engine control units.

IC Role / Device Role / Timing Role: Zener diode acts as precision voltage reference and transient clamp on sensor supply rail.

Use Value: Maintains sensor accuracy across −40 °C to +125 °C ambient with < ±16.5 mV regulation error under load variation.

Use Scenario: Clamping USB 3.3 V VBUS line against ESD and hot-swap surges in infotainment head units.

IC Role / Device Role / Timing Role: Reverse-biased Zener shunts overvoltage events above 3.5 V to ground before IC damage occurs.

Use Value: Responds within nanoseconds and absorbs 40 W non-repetitive pulses without degradation, meeting IEC 61000-4-2 Level 4.

Industrial PLC Input Protection

Low-Power MCU Reference

Use Scenario: Protecting 3.3 V digital input channels of programmable logic controllers from field-induced transients.

IC Role / Device Role / Timing Role: Zener diode placed between input pin and ground to limit voltage excursion during surge events.

Use Value: Low 5.0 Ω impedance ensures clamping voltage stays within safe margin of MCU absolute maximum ratings.

Use Scenario: Supplying a stable 3.3 V reference to ADC voltage dividers in battery-powered IoT edge nodes.

IC Role / Device Role / Timing Role: Functions as low-current Zener reference (I_Z = 5 mA) for ratiometric measurement circuits.

Use Value: −3.5 mV/K temperature coefficient enables software-based drift correction, improving 12-bit ADC linearity by >0.5 LSB.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX384-B3V3,115	Same 3.3 V nominal, ±5 %, SOD323, but 200 mW P_tot vs. 300 mW; r_diff = 90 Ω	Lower power and higher impedance limit use to ultra-low-current references (<1 mA)	Select when board space matches and thermal budget permits lower dissipation
MMSZ5226B-TP	3.3 V, ±5 %, SOD123 package (larger); r_diff = 15 Ω; P_tot = 500 mW; not AEC-Q101 qualified	Higher power handling but lacks automotive qualification and has larger footprint	Prefer for industrial non-automotive designs requiring higher surge margin and relaxed size constraints

Compared with BZX384-B3V3,115 and MMSZ5226B-TP, SZMM3Z3V3T1GX uniquely combines AEC-Q101 qualification, 300 mW rating, and 5.0 Ω impedance in the smallest SOD323 form factor-making it optimal for space-constrained automotive and portable electronics where regulation precision and reliability are co-critical.

Availability

SZMM3Z3V3T1GX is available at Aetrix Electronics and suitable for automotive sensor biasing, USB port protection, industrial PLC input conditioning, and low-power MCU reference circuits requiring stable component supply, AEC-Q101 compliance, and consistent Zener performance across production batches.

Supply support for SZMM3Z3V3T1GX 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, high-reliability discrete, logic, and MOSFET solutions, serving automotive, industrial, and consumer markets with scalable manufacturing and rigorous quality systems.

SZMM3Z3V3T1GX belongs to the SZMM3Z series of AEC-Q101-qualified Zener diodes engineered specifically for automotive voltage regulation and transient suppression-designed to meet stringent thermal, surge, and long-term stability requirements in under-hood and cabin electronics.

FAQ

What is the maximum continuous power dissipation for SZMM3Z3V3T1GX?

The maximum total power dissipation is 300 mW at ambient temperature of 25 °C on a standard FR4 PCB with single-sided copper. Derating is required above 25 °C at 2.4 mW/°C, based on R_th(j-a) = 415 K/W. This value is confirmed in Table 5 (Limiting values) of the official Nexperia datasheet Rev. 5.

Is SZMM3Z3V3T1GX suitable for automotive applications?

Yes-it is fully qualified to AEC-Q101 standards for discrete semiconductors, including stress tests for temperature cycling, humidity, and mechanical shock. Its guaranteed operation from −55 °C to +150 °C junction temperature and robust surge capability make it appropriate for engine control, ADAS, and infotainment systems.

How does the Zener voltage tolerance affect circuit design?

The ±5 % tolerance (3.10 V to 3.50 V at 5 mA) means designers must verify that downstream components tolerate this 400 mV window. For precision references, pairing with trimming resistors or calibration routines is recommended. This tolerance is tighter than legacy Zeners and aligns with modern 3.3 V rail tolerancing requirements.

What is the significance of the −3.5 mV/K temperature coefficient?

This negative coefficient indicates Zener voltage decreases by 3.5 mV per Kelvin rise in junction temperature. At 100 °C ΔT, the shift is ~350 mV-significant for high-accuracy references. Designers use this known slope for software compensation or select complementary components to achieve net-zero drift in critical analog signal chains.

SZMM3Z3V3T1GX 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):: 3.3 V

Tolerance:: ±5%

Power - Max:: 300 mW

Impedance (Max) (Zzt):: 95 Ohms

Current - Reverse Leakage @ Vr:: 5 µA @ 1 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

SZMM3Z3V3T1GX FAQ

1.How can I place an order for SZMM3Z3V3T1GX through Aetrix?

Please submit a Request for Quotation (RFQ) for SZMM3Z3V3T1GX 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 SZMM3Z3V3T1GX reliable?

The price and inventory of SZMM3Z3V3T1GX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z3V3T1GX is usually 5 days.

3.What payment methods are accepted for SZMM3Z3V3T1GX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z3V3T1GX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SZMM3Z3V3T1GX?

SZMM3Z3V3T1GX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SZMM3Z3V3T1GX 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 SZMM3Z3V3T1GX?

For technical support, including SZMM3Z3V3T1GX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z3V3T1GX requirements.

6.How does Aetrix verify that SZMM3Z3V3T1GX is sourced from the original manufacturer or authorized distributors?

All SZMM3Z3V3T1GX 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 SZMM3Z3V3T1GX meets industry standards.

7.What is the process for return or replacement of SZMM3Z3V3T1GX?

All SZMM3Z3V3T1GX units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z3V3T1GX, 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 SZMM3Z3V3T1GX part is unused and in its original packaging.

Return procedure for SZMM3Z3V3T1GX:

1.Submit a request within 90 days.

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

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