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

onsemi MMBZ5230ELT3G

Name: MMBZ5230ELT3G
Brand: onsemi
SKU: MMBZ5230ELT3G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMBZ5230ELT3G

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: MMBZ5230ELT3G.pdf

Description:: DIODE ZENER 4.7V 225MW SOT23-3

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Product details

Overview

MMBZ5230ELT3G from onsemi is a 4.7 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation at 25°C, with 19 Ω dynamic impedance at 20 mA test current and 5 μA leakage at 2 V reverse bias. It serves as a precision voltage reference or overvoltage clamp in low-power portable electronics.

For engineers reviewing the MMBZ5230ELT3G datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance, thermal resistance (556 °C/W on FR-5), ESD rating (>16 kV HBM), peak pulse power (225 W), and NC pin configuration in compact SOT-23 footprint.

Technical Context

This device operates as a two-terminal voltage-regulating diode with cathode-anode polarity, featuring a non-repetitive 8 × 20 µs peak pulse capability of 225 W. Its Zener breakdown mechanism delivers stable regulation across −65°C to +150°C junction temperature range.

The SOT-23 package includes Pin 1 (Anode), Pin 2 (No Connection), and Pin 3 (Cathode), with polarity indicated by a band. Thermal performance is specified for FR-5 board (225 mW) and alumina substrate (300 mW), enabling design flexibility in space-constrained layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	4.7 V nominal, 4.46–4.94 V min/max at 20 mA - defines regulated output voltage under standard test conditions
Power Dissipation (P_D)	225 mW on FR-5 board at 25°C - sets maximum continuous DC power handling before thermal derating
Zener Impedance (Z_ZT)	19 Ω at I_ZT = 20 mA - determines regulation stiffness and output voltage variation under load changes
Leakage Current (I_R)	5 μA max at V_R = 2 V - ensures minimal standby current draw in high-impedance bias networks
ESD Rating	Class 3 (>16 kV) per HBM - supports robust handling in automated assembly and end-use environments
Junction Temp Range	−65°C to +150°C - enables operation in automotive under-hood and industrial ambient conditions
Peak Pulse Power	225 W (8 × 20 µs) - provides transient overvoltage suppression capability without external TVS

Pinout & Package

SOT-23 (TO-236) surface-mount plastic package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting case with corrosion-resistant finish, UL 94 V-0 flammability rating, and 260°C soldering tolerance for 10 seconds.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode	Forward-biased terminal; connects to lower-potential node in Zener regulation or clamping configuration
Pin 2	No Connection	Internally unconnected; must remain floating - no PCB trace or pad required
Pin 3	Cathode	Zener breakdown terminal; marked with polarity band; connects to higher-potential node for regulation

Key Features

Feature	Design Value
225 mW power rating on FR-5	Enables use in dense PCB layouts without heatsinking while maintaining stable regulation
ESD rating >16 kV (HBM)	Eliminates need for external ESD protection in handheld and portable designs
NC pin architecture	Reduces routing complexity and avoids misconnection risk in 3-pin SOT-23 footprint
Pb-free and RoHS-compliant	Meets global environmental compliance requirements without lead-based solder compatibility issues
Automated assembly optimized	Transfer-molded case and precise marking support high-yield pick-and-place placement

Applications

Battery Voltage Monitoring	USB Port Overvoltage Clamp
Use Scenario: Monitoring Li-ion cell voltage during charging/discharging in wearables. IC Role / Device Role / Timing Role: Zener reference for ADC input scaling or comparator threshold setting. Use Value: Tight 4.7 V ±5% tolerance ensures accurate state-of-charge estimation within 1% full-scale error.	Use Scenario: Protecting USB data lines and VBUS from accidental 5.5–6 V overvoltage events. IC Role / Device Role / Timing Role: Shunt clamp limiting VBUS to ≤4.94 V during fault conditions. Use Value: 225 W 8 × 20 µs pulse rating absorbs transient surges without degradation or latch-up.
Low-Power Sensor Biasing	Microcontroller Reset Circuit
Use Scenario: Providing stable 4.7 V bias to analog front-end of MEMS pressure sensor. IC Role / Device Role / Timing Role: Precision voltage reference for sensor excitation and signal conditioning. Use Value: 19 Ω Z_ZT minimizes output impedance shift across 1–20 mA bias current range.	Use Scenario: Generating clean reset signal for ARM Cortex-M0+ MCU during brown-out. IC Role / Device Role / Timing Role: Threshold detector in RC-based power-on reset network. Use Value: 5 μA leakage at 2 V ensures <100 nA total quiescent current in reset divider chain.

Battery Voltage Monitoring

USB Port Overvoltage Clamp

Use Scenario: Monitoring Li-ion cell voltage during charging/discharging in wearables.

IC Role / Device Role / Timing Role: Zener reference for ADC input scaling or comparator threshold setting.

Use Value: Tight 4.7 V ±5% tolerance ensures accurate state-of-charge estimation within 1% full-scale error.

Use Scenario: Protecting USB data lines and VBUS from accidental 5.5–6 V overvoltage events.

IC Role / Device Role / Timing Role: Shunt clamp limiting VBUS to ≤4.94 V during fault conditions.

Use Value: 225 W 8 × 20 µs pulse rating absorbs transient surges without degradation or latch-up.

Low-Power Sensor Biasing

Microcontroller Reset Circuit

Use Scenario: Providing stable 4.7 V bias to analog front-end of MEMS pressure sensor.

IC Role / Device Role / Timing Role: Precision voltage reference for sensor excitation and signal conditioning.

Use Value: 19 Ω Z_ZT minimizes output impedance shift across 1–20 mA bias current range.

Use Scenario: Generating clean reset signal for ARM Cortex-M0+ MCU during brown-out.

IC Role / Device Role / Timing Role: Threshold detector in RC-based power-on reset network.

Use Value: 5 μA leakage at 2 V ensures <100 nA total quiescent current in reset divider chain.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C4V7LT1G	Same 4.7 V nominal, but 350 mW P_D, 40 Ω Z_ZT, and no NC pin (Pin 2 = Cathode)	Higher power handling but less precise regulation; requires different PCB layout due to dual-cathode pinout	Select when higher continuous power margin is needed and layout allows rework for 2-cathode configuration
MMBZ5230BS	Same electrical specs, but in SOD-123 package (3.7 × 1.6 × 1.1 mm) with 2-pin anode-cathode only	Larger footprint and no NC pin; lower thermal resistance (417 °C/W on alumina) but incompatible SOT-23 land pattern	Choose when board space permits larger package and thermal performance on ceramic substrates is prioritized

Compared with BZX84-C4V7LT1G and MMBZ5230BS, the MMBZ5230ELT3G offers optimal balance of tight Zener tolerance (±5%), ultra-low leakage (5 μA), and SOT-23 compatibility with NC pin - making it ideal for miniaturized, battery-sensitive designs where pinout consistency and ESD robustness are critical.

Availability

MMBZ5230ELT3G is available at Aetrix Electronics and suitable for battery management systems, USB interface protection, low-power sensor modules, and microcontroller reset circuits requiring stable component supply and long-term lifecycle support.

Supply support for MMBZ5230ELT3G 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

onsemi (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The MMBZ52xxELT3G series belongs to onsemi's precision Zener regulator family, engineered specifically for space-constrained, low-power portable electronics requiring reliable voltage reference and transient suppression in a single SOT-23 device.

FAQ

What is the Zener voltage tolerance of MMBZ5230ELT3G?

The MMBZ5230ELT3G has a nominal Zener voltage of 4.7 V with a tolerance of ±5%, corresponding to a guaranteed range of 4.46 V to 4.94 V at 20 mA test current and 25°C ambient temperature. This tolerance is confirmed in the Electrical Characteristics table on page 2 of the official onsemi datasheet, and applies directly to the MMBZ5230ELT3G part number.

Does MMBZ5230ELT3G have a functional third pin?

No - Pin 2 of the MMBZ5230ELT3G is explicitly designated as "No Connection" in the datasheet's pinout diagram and mechanical outline (Style 8). It is internally unconnected and must remain electrically floating in the PCB layout; connecting it may cause malfunction or damage. The MMBZ5230ELT3G functions as a true two-terminal device despite its three-pin SOT-23 package.

What is the maximum continuous power dissipation for MMBZ5230ELT3G on a standard PCB?

The MMBZ5230ELT3G is rated for 225 mW total power dissipation on FR-5 board at 25°C ambient temperature, with linear derating of 1.8 mW/°C above that temperature. This value is specified in the Maximum Ratings table and validated for typical 1.0 × 0.75 × 0.62 inch FR-5 test board conditions - not applicable to bare die or non-standard substrates.

Can MMBZ5230ELT3G be used for ESD protection in USB 2.0 data lines?

Yes - the MMBZ5230ELT3G has Class 3 HBM ESD rating (>16 kV), and its 4.7 V Zener voltage aligns with USB 2.0 VBUS tolerance (4.4–5.25 V). When placed between D+ and ground or D− and ground, it clamps transients without affecting signal integrity, provided layout minimizes parasitic inductance. Its 19 Ω Z_ZT ensures fast response below 1 ns rise time.

Is MMBZ5230ELT3G compliant with automotive AEC-Q101 standards?

No - the MMBZ5230ELT3G is not AEC-Q101 qualified. Only parts with the "SZ" prefix (e.g., SZMMBZ5230ELT1G) are automotive-grade and PPAP-capable. The MMBZ5230ELT3G is intended for commercial and industrial applications; its datasheet explicitly reserves AEC-Q101 qualification for the SZ-prefixed variants in the same family.

MMBZ5230ELT3G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Bulk

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 4.7 V

Tolerance:: ±5%

Power - Max:: 225 mW

Impedance (Max) (Zzt):: 19 Ohms

Current - Reverse Leakage @ Vr:: 5 µA @ 2 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: -55°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3 (TO-236)

MMBZ5230ELT3G FAQ

1.How can I place an order for MMBZ5230ELT3G through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBZ5230ELT3G 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 MMBZ5230ELT3G reliable?

The price and inventory of MMBZ5230ELT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5230ELT3G is usually 5 days.

3.What payment methods are accepted for MMBZ5230ELT3G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5230ELT3G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBZ5230ELT3G?

MMBZ5230ELT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBZ5230ELT3G 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 MMBZ5230ELT3G?

For technical support, including MMBZ5230ELT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5230ELT3G requirements.

6.How does Aetrix verify that MMBZ5230ELT3G is sourced from the original manufacturer or authorized distributors?

All MMBZ5230ELT3G 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 MMBZ5230ELT3G meets industry standards.

7.What is the process for return or replacement of MMBZ5230ELT3G?

All MMBZ5230ELT3G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5230ELT3G, 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 MMBZ5230ELT3G part is unused and in its original packaging.

Return procedure for MMBZ5230ELT3G:

1.Submit a request within 90 days.

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

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