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

Nexperia USA Inc. MM5Z3V9T5GF

Name: MM5Z3V9T5GF
Brand: Nexperia USA Inc.
SKU: MM5Z3V9T5GF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MM5Z3V9T5GF

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: SC-79, SOD-523

Datasheet:: MM5Z3V9T5GF.pdf

Description:: DIODE ZENER 3.9V 300MW SOD523

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Product details

Overview

MM5Z3V9T5GF from Nexperia is a 3.9 V ±2 % tolerance Zener diode in SOD523 (SC-79) package, rated for 300 mW total power dissipation and 40 W non-repetitive peak reverse power, with 3.0 Ω differential resistance at I_Z = 5 mA and −3.5 to 0 mV/K temperature coefficient - used for precision voltage reference and low-power regulation in space-constrained consumer and industrial PCBs.

For engineers reviewing the MM5Z3V9T5GF datasheet, MM5Z3V9T5GF pinout, MM5Z3V9T5GF application, or MM5Z3V9T5GF equivalent, this page delivers verified electrical specs, cathode/anode terminal mapping, thermal resistance data (R_th(j-a) = 350 K/W), and real-world use cases including USB port overvoltage clamping and microcontroller reset circuit biasing.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 3.82–3.98 V at I_Z = 5 mA, maintaining stable regulation under load variations up to 200 mA forward current and transient surges up to 40 W (100 µs square wave). Its low 3.0 Ω differential resistance ensures minimal voltage shift across operating current range.

Thermal performance is defined by R_th(j-a) = 350 K/W (FR4 PCB, 35 mm² copper) and R_th(j-sp) = 65 K/W (cathode solder point), enabling reliable operation up to T_j = 150 °C. Reverse leakage remains ≤100 µA at V_R = 1 V, supporting low-quiescent-current designs.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	3.82–3.98 V at I_Z = 5 mA - defines precise regulation threshold for 3.3 V system rails
Tolerance	±2 % - enables tight voltage margin control without post-production trimming
Differential Resistance (r_diff)	3.0 Ω max at I_Z = 5 mA - ensures <15 mV output shift over ±1 mA load variation
Total Power Dissipation (P_tot)	300 mW at T_amb = 25 °C - supports continuous regulation in compact SMT layouts
Non-repetitive Peak Power (P_ZSM)	40 W (100 µs square wave) - provides robust ESD/transient suppression in I/O protection circuits
Forward Voltage (V_F)	1.1 V max at I_F = 100 mA - allows use as low-drop rectifier or clamp in bidirectional signal paths
Reverse Leakage (I_R)	≤100 µA at V_R = 1 V - minimizes standby current in battery-powered sensor nodes

Pinout & Package

SOD523 (SC-79) ultra-small surface-mount plastic package: 1.25 mm × 0.85 mm footprint, 0.65 mm height, 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 during Zener operation

Key Features

Feature	Design Value
Ultra-compact SOD523 package	Enables placement in high-density layouts where board space is constrained to <1.1 mm² per device
±2 % Zener voltage tolerance	Eliminates need for external trimming resistors in 3.3 V supply monitoring circuits
Low 3.0 Ω differential resistance	Maintains regulation accuracy within ±12 mV across 3–7 mA operating current range
−3.5 to 0 mV/K temperature coefficient	Minimizes drift to <±15 mV over −40 to +85 °C ambient range in portable electronics
40 W surge rating (100 µs)	Withstands IEC 61000-4-2 Level 4 ESD events without degradation in USB-C port protection

Applications

USB Port Overvoltage Clamp

Microcontroller Reset Circuit Bias

Use Scenario: Clamping transient voltages on USB 2.0 D+ and D− lines during hot-plug or ESD events.

IC Role / Device Role / Timing Role: Zener diode configured in back-to-back arrangement to limit differential swing to ±3.9 V.

Use Value: Prevents damage to USB transceiver ICs by limiting peak reverse voltage to 3.98 V while sustaining 40 W surge energy.

Use Scenario: Providing stable bias voltage to enable internal reset comparator in low-power MCU applications.

IC Role / Device Role / Timing Role: Zener referenced against V_DD to generate accurate 3.9 V threshold for brown-out detection.

Use Value: Enables reset assertion within 10 µs of supply drop below 3.82 V, meeting ARM Cortex-M0+ timing requirements.

IoT Sensor Node Reference

LED Driver Current Sense Shunt

Use Scenario: Generating stable 3.9 V reference for ADC input scaling in battery-operated environmental sensors.

IC Role / Device Role / Timing Role: Zener diode biased at 5 mA to feed precision op-amp buffer driving 12-bit SAR ADC reference pin.

Use Value: Delivers <0.05 % full-scale error contribution due to ±2 % V_Z tolerance and <10 ppm/°C effective TC.

Use Scenario: Acting as low-cost current-sense shunt in constant-current LED driver feedback loop.

IC Role / Device Role / Timing Role: Zener placed in series with sense resistor to elevate common-mode voltage above ground for op-amp input compliance.

Use Value: Allows use of single-supply op-amp by shifting sense node to 3.9 V, eliminating need for level-shifting circuitry.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX584-C3V9	Same 3.9 V nominal, ±5 % tolerance, 350 mW P_tot, SOD523 package	Higher 5 % tolerance increases reset threshold uncertainty by ±195 mV vs. ±78 mV for MM5Z3V9T5GF	Select when cost sensitivity outweighs precision requirement and ±5 % V_Z is acceptable
MM3Z3V9T1G	Same 3.9 V nominal, ±2 % tolerance, but SOD323 package (1.7 × 1.3 mm) and 200 mW P_tot	Larger footprint and 33 % lower power rating limit surge handling in I/O protection roles	Select only if legacy SOD323 footprint compatibility is required and peak power stays below 200 mW

Compared with BZX584-C3V9 and MM3Z3V9T1G, MM5Z3V9T5GF offers the optimal balance of ±2 % precision, 300 mW continuous power, and ultra-compact SOD523 size - making it preferred for next-generation wearables and miniaturized industrial controllers where regulation accuracy and board area are jointly constrained.

Availability

MM5Z3V9T5GF is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset supervision, IoT sensor reference generation, and LED driver biasing requiring stable component supply across high-mix, low-volume production runs.

Supply support for MM5Z3V9T5GF 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 efficiency technologies, delivering high-performance, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.

The MM5Z series targets space-constrained, low-power regulation needs - designed specifically for precision voltage referencing and transient suppression in ultra-thin mobile devices and battery-powered edge sensors.

FAQ

What is the maximum continuous reverse current the MM5Z3V9T5GF can sustain without exceeding its 300 mW power limit?

At nominal Zener voltage (3.9 V), the maximum continuous reverse current is 76.9 mA (300 mW ÷ 3.9 V). This assumes T_amb = 25 °C on FR4 with 35 mm² copper; derating applies above 25 °C per R_th(j-a) = 350 K/W.

How does the cathode marking on the SOD523 package align with PCB layout for automated assembly?

The cathode is indicated by a visible bar on the top surface, aligned with Pin 1 in standard SOD523 land pattern (IEC JEDEC SOT523 outline). The bar corresponds to the leftmost pad in the 0.5 mm pitch footprint shown in Figure 10 of the datasheet, ensuring correct orientation during pick-and-place.

Can MM5Z3V9T5GF be used in place of a 3.3 V Zener for logic-level translation?

No - its 3.82–3.98 V Zener range exceeds typical 3.3 V logic thresholds. Using it for 3.3 V rail clamping risks false triggering of overvoltage protection or incorrect reset assertion; a dedicated 3.3 V Zener like MM5Z3V3T5GF is required.

What is the impact of mounting on FR4 with less than 35 mm² copper area on thermal performance?

Reduced copper area increases R_th(j-a) beyond 350 K/W - e.g., 10 mm² copper raises it to ~520 K/W. At 300 mW dissipation, junction temperature rise increases from 105 °C to ~156 °C, risking exceedance of 150 °C T_j limit unless ambient is reduced.

MM5Z3V9T5GF Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: MM5Z

Package/Case:: SC-79, SOD-523

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 3.9 V

Tolerance:: ±2%

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:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-523

MM5Z3V9T5GF FAQ

1.How can I place an order for MM5Z3V9T5GF through Aetrix?

Please submit a Request for Quotation (RFQ) for MM5Z3V9T5GF 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 MM5Z3V9T5GF reliable?

The price and inventory of MM5Z3V9T5GF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM5Z3V9T5GF is usually 5 days.

3.What payment methods are accepted for MM5Z3V9T5GF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM5Z3V9T5GF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MM5Z3V9T5GF?

MM5Z3V9T5GF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MM5Z3V9T5GF 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 MM5Z3V9T5GF?

For technical support, including MM5Z3V9T5GF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM5Z3V9T5GF requirements.

6.How does Aetrix verify that MM5Z3V9T5GF is sourced from the original manufacturer or authorized distributors?

All MM5Z3V9T5GF 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 MM5Z3V9T5GF meets industry standards.

7.What is the process for return or replacement of MM5Z3V9T5GF?

All MM5Z3V9T5GF units undergo pre-shipment inspection (PSI). If there is an issue with MM5Z3V9T5GF, 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 MM5Z3V9T5GF part is unused and in its original packaging.

Return procedure for MM5Z3V9T5GF:

1.Submit a request within 90 days.

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

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