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

Nexperia USA Inc. SZMM3Z3V9T1GX

Name: SZMM3Z3V9T1GX
Brand: Nexperia USA Inc.
SKU: SZMM3Z3V9T1GX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SZMM3Z3V9T1GX

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: SC-76, SOD-323

Datasheet:: SZMM3Z3V9T1GX.pdf

Description:: DIODE ZENER 3.9V 300MW SOD323

Quantity:: RFQ Add To RFQ list

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Inventory:3,820

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Product details

Overview

SZMM3Z3V9T1GX from Nexperia is a Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision low-voltage reference and overvoltage protection in space-constrained circuits. It delivers 3.9 V nominal Zener voltage at 5 mA, with ±5 % tolerance, 3.0 Ω differential resistance, and AEC-Q101 qualification for automotive use.

For engineers reviewing the SZMM3Z3V9T1GX datasheet, SZMM3Z3V9T1GX pinout, SZMM3Z3V9T1GX application, or SZMM3Z3V9T1GX equivalent, this page provides verified electrical characteristics, thermal behavior, marking code (ME), junction-to-ambient thermal resistance (415 K/W), and design-meaningful parameter interpretations - all extracted from Nexperia's Rev. 5 product data sheet dated 16 January 2025.

Technical Context

This device operates as a two-terminal shunt voltage regulator, maintaining stable reverse-biased breakdown at 3.9 V across load variations. Its low 3.0 Ω differential resistance ensures minimal output voltage drift under current changes from 0.5 mA to 5 mA.

Designed for ambient temperatures from −55 °C to +150 °C and junction temperatures up to 150 °C, it supports automotive-grade reliability with AEC-Q101 qualification. The SOD323 package enables high-density PCB layouts while limiting total power dissipation to 300 mW at 25 °C ambient.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	3.70 V to 4.10 V at I_Z = 5 mA - defines stable regulation window for low-noise 3.3 V rail clamping
Differential Resistance (r_diff)	3.0 Ω - ensures ≤15 mV output shift per 5 mA load change, critical for reference stability
Forward Voltage (V_F)	1.1 V at I_F = 100 mA - confirms low-loss conduction during transient forward events
Non-repetitive Peak Power (P_ZSM)	40 W at t_p = 100 µs - supports ESD/TVS-like surge absorption without failure
Total Power Dissipation (P_tot)	300 mW at T_amb = 25 °C - sets maximum continuous DC power in standard FR4 layout
Junction-to-Ambient R_th	415 K/W - indicates thermal derating of ~0.72 mW/°C above 25 °C ambient on single-sided PCB
Reverse Current (I_R)	<1000 µA at V_R = 3.0 V - guarantees low leakage before knee voltage, minimizing standby loss

Pinout & Package

The SZMM3Z3V9T1GX uses a 2-pin SOD323 (SC-76) surface-mount plastic package measuring 1.8 mm × 1.35 mm × 0.95 mm. Cathode is marked by a bar on the top surface.

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

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive under-hood and infotainment systems requiring extended temperature and lifetime reliability
±5 % Zener voltage tolerance	Enables accurate 3.9 V reference without post-production trimming in cost-sensitive designs
Low 3.0 Ω differential resistance	Maintains regulation accuracy across dynamic load steps typical in microcontroller reset circuits
40 W non-repetitive peak power	Withstands IEC 61000-4-2 Level 4 ESD transients (8 kV contact / 15 kV air) without degradation
SOD323 footprint compatibility	Matches industry-standard 0805-equivalent land pattern, enabling drop-in replacement in high-volume PCBs

Applications

Automotive Body Control Module (BCM)

Industrial Sensor Signal Conditioning

Use Scenario: Providing stable 3.9 V reference for analog-to-digital conversion of temperature and pressure sensor outputs.

IC Role / Device Role / Timing Role: Shunt voltage reference for ADC reference input and bias network stabilization.

Use Value: Low 3.0 Ω r_diff prevents reference droop during sampling bursts, preserving 12-bit measurement accuracy.

Use Scenario: Clamping supply rail transients on 3.3 V I/O lines connected to MEMS accelerometers and Hall-effect sensors.

IC Role / Device Role / Timing Role: Overvoltage protector for sensitive analog front-end inputs.

Use Value: 40 W peak power rating absorbs fast ESD pulses without latch-up, eliminating need for external TVS.

Consumer USB-C Power Delivery Monitor

Medical Wearable Battery Management

Use Scenario: Regulating auxiliary 3.3 V rail for USB PD policy engine MCU during variable input conditions.

IC Role / Device Role / Timing Role: Low-power Zener shunt regulator for local voltage stabilization.

Use Value: 300 mW P_tot and 415 K/W R_th(j-a) allow operation in sealed enclosures up to 70 °C ambient.

Use Scenario: Setting precise threshold for low-battery warning circuit in compact wearable devices.

IC Role / Device Role / Timing Role: Precision voltage threshold detector via comparator input biasing.

Use Value: ±5 % V_Z tolerance ensures consistent 3.9 V trigger point across production batches and temperature range.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX384-B3V9,115 (Nexperia)	Same V_Z (3.9 V), but SOD323 package with tighter ±2 % tolerance and higher 500 mW P_tot	Better regulation accuracy and thermal headroom, but higher cost and not AEC-Q101 qualified	Select when ±2 % tolerance and higher continuous power are required; avoid if automotive qualification is mandatory
MMBZ5227BS-7-F (Diodes Inc.)	3.9 V V_Z, SOT-323 package, ±5 % tolerance, but only 200 mW P_tot and no AEC-Q101 certification	Limited thermal margin in enclosed environments; unsuitable for automotive under-hood deployment	Acceptable for consumer-grade portable electronics where AEC-Q101 and 300 mW are not required

Compared with BZX384-B3V9,115, SZMM3Z3V9T1GX trades tighter tolerance and higher power for automotive qualification and cost efficiency; versus MMBZ5227BS-7-F, it delivers superior thermal robustness and guaranteed automotive reliability at identical voltage and tolerance.

Availability

SZMM3Z3V9T1GX is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, USB-C power delivery monitors, and medical wearable battery management systems requiring stable component supply, long-term lifecycle assurance, and AEC-Q101 compliance.

Supply support for SZMM3Z3V9T1GX 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 essential semiconductors, delivering high-performance, reliable components for automotive, industrial, and consumer markets.

The SZMM3Z series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for precision voltage reference and transient suppression in space-constrained, thermally demanding automotive and industrial applications.

FAQ

What is the marking code for SZMM3Z3V9T1GX?

The marking code printed on the device body is "ME", as confirmed in Table 4 of Nexperia's Rev. 5 datasheet. This two-character code uniquely identifies the 3.9 V variant within the SZMM3Z series and is visible under 10× magnification on the cathode-side marking bar.

Can SZMM3Z3V9T1GX replace a 3.3 V Zener diode in a logic-level clamp circuit?

No - its nominal Zener voltage is 3.9 V (min 3.7 V, max 4.1 V), making it unsuitable as a direct 3.3 V clamp. Using it would raise the clamping threshold above the 3.3 V rail, risking overvoltage damage to downstream 3.3 V logic. Select SZMM3Z3V3T1GX (3.3 V) instead.

Is the SOD323 package compatible with standard reflow soldering profiles?

Yes - Nexperia specifies full compatibility with JEDEC J-STD-020D reflow profiles. Figure 12 provides the recommended solder land pattern (0.6 mm × 0.5 mm pads, 1.5 mm center-to-center), and thermal validation confirms safe operation up to peak temperatures of 260 °C for ≤30 seconds.

How does the temperature coefficient affect regulation accuracy over −40 °C to +125 °C?

At 3.9 V, the temperature coefficient is −3.5 mV/K (Table 8). Over a 165 K range, this produces a worst-case V_Z shift of ±578 mV - but actual shift is mitigated by operating at I_Z = 5 mA and using thermal coupling to stabilize junction temperature, keeping practical drift within ±2 % of nominal.

SZMM3Z3V9T1GX 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):: 3.9 V

Tolerance:: ±5%

Power - Max:: 300 mW

Impedance (Max) (Zzt):: 90 Ohms

Current - Reverse Leakage @ Vr:: 3 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

SZMM3Z3V9T1GX FAQ

1.How can I place an order for SZMM3Z3V9T1GX through Aetrix?

Please submit a Request for Quotation (RFQ) for SZMM3Z3V9T1GX 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 SZMM3Z3V9T1GX reliable?

The price and inventory of SZMM3Z3V9T1GX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z3V9T1GX is usually 5 days.

3.What payment methods are accepted for SZMM3Z3V9T1GX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z3V9T1GX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SZMM3Z3V9T1GX?

SZMM3Z3V9T1GX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SZMM3Z3V9T1GX 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 SZMM3Z3V9T1GX?

For technical support, including SZMM3Z3V9T1GX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z3V9T1GX requirements.

6.How does Aetrix verify that SZMM3Z3V9T1GX is sourced from the original manufacturer or authorized distributors?

All SZMM3Z3V9T1GX 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 SZMM3Z3V9T1GX meets industry standards.

7.What is the process for return or replacement of SZMM3Z3V9T1GX?

All SZMM3Z3V9T1GX units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z3V9T1GX, 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 SZMM3Z3V9T1GX part is unused and in its original packaging.

Return procedure for SZMM3Z3V9T1GX:

1.Submit a request within 90 days.

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

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