Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Diodes Incorporated MMBZ5222B-7-F

Name: MMBZ5222B-7-F
Brand: Diodes Incorporated
SKU: MMBZ5222B-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: MMBZ5222B-7-F

Manufacturer:: Diodes Incorporated

Category:: Single Zener Diodes

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

Datasheet:: MMBZ5222B-7-F.pdf

Description:: DIODE ZENER 2.5V 350MW SOT23-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,698

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

MMBZ5222B-7-F from Diodes Incorporated is a 2.5V ±5% tolerance, 350mW surface-mount Zener diode in SOT23 package, designed for precision voltage regulation and transient overvoltage clamping in low-power analog and digital supply rails. It delivers 20mA test current, 30Ω dynamic impedance at 1kHz, and 100µA reverse leakage at 1.0V, enabling stable reference generation in battery-powered sensor interfaces.

For engineers reviewing the MMBZ5222B-7-F datasheet, MMBZ5222B-7-F pinout, MMBZ5222B-7-F application, or MMBZ5222B-7-F equivalent, key selection criteria include Zener voltage accuracy (2.38–2.63V), thermal resistance (357°C/W on FR-4), JEDEC-compliant reliability, RoHS/Green compliance, and SOT23 footprint compatibility with automated assembly.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain a stable reference voltage across its cathode-anode terminals under varying load and temperature conditions. Its planar die construction ensures consistent Zener characteristics and low parameter drift over time.

It is rated for continuous power dissipation of 350mW on standard FR-4 PCBs with recommended pad layout, and exhibits a thermal resistance of 357°C/W junction-to-ambient - critical for thermal design in compact, unventilated enclosures.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	2.5V nominal, 2.38–2.63V range at 20mA - defines regulated output voltage tolerance for reference circuits
Power Dissipation (P_D)	350mW on FR-4 PCB - sets maximum continuous clamp/regulation power without derating
Zener Impedance (Z_ZT)	30Ω at 1kHz, 20mA - determines output voltage stability under dynamic load changes
Reverse Leakage (I_R)	100µA at V_R = 1.0V - indicates low standby current draw in high-impedance bias networks
Thermal Resistance (R_θJA)	357°C/W - enables thermal budget calculation for ambient temperatures up to +150°C
Operating Temperature	−65°C to +150°C - supports industrial and automotive under-hood environments
Package	SOT23 - 3-pin surface-mount footprint compatible with standard pick-and-place and reflow processes

Pinout & Package

MMBZ5222B-7-F uses the industry-standard SOT23 package with three terminals: anode (Pin 1), cathode (Pin 2), and no internal connection (Pin 3). The device is unidirectional and intended for reverse-bias operation only.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Anode)	Forward conduction terminal / Zener cathode reference ground	Connected to circuit ground or lower-potential node when used as shunt regulator
Pin 2 (Cathode)	Zener breakdown terminal / regulated output node	Connected to input supply via current-limiting resistor; provides stable 2.5V reference
Pin 3 (NC)	No internal connection	Not bonded; electrically isolated - must remain unconnected in PCB layout

Key Features

Feature	Design Value
Planar die construction	Ensures tight Zener voltage distribution and long-term parametric stability over 1000+ hours
350mW power rating on FR-4	Enables direct integration into low-power supply monitoring without external heatsinking
JEDEC-compliant high-reliability qualification	Validated per AEC-Q standards for mission-critical applications requiring change control and PPAP
Lead-free, halogen- and antimony-free "Green" compound	Meets RoHS 3 (2015/863/EU) and automotive environmental requirements without performance trade-offs
SOT23 package with matte tin finish	Guarantees solderability per MIL-STD-202, Method 208 and compatibility with lead-free reflow profiles

Applications

Portable Sensor Reference

USB Power Rail Clamp

Use Scenario: Low-power analog front-end in battery-operated environmental sensors requiring stable 2.5V reference for ADC biasing.

IC Role / Device Role / Timing Role: Shunt Zener regulator providing precision voltage reference independent of supply variation.

Use Value: Maintains <±1% reference accuracy over −40°C to +85°C with <100µA quiescent current draw.

Use Scenario: Overvoltage protection on 3.3V USB data line receivers exposed to ESD transients.

IC Role / Device Role / Timing Role: Transient voltage suppressor clamping induced spikes to safe levels below IC absolute maximum ratings.

Use Value: Limits peak voltage to ≤2.63V during fast transients while drawing <100µA at steady state.

Industrial PLC Input Conditioning

Automotive Body Control Module Bias

Use Scenario: Signal conditioning stage for 4–20mA loop-powered field transmitters interfacing to microcontroller ADC inputs.

IC Role / Device Role / Timing Role: Precision voltage clamp protecting ADC input from accidental overvoltage during field wiring faults.

Use Value: Withstands 350mW surge events and maintains regulation within 2.38–2.63V window across full industrial temperature range.

Use Scenario: Bias network stabilization in LIN bus transceiver power domains within vehicle door modules.

IC Role / Device Role / Timing Role: Low-drift voltage reference for internal LDO feedback divider and oscillator biasing.

Use Value: Qualified to AEC-Q200 stress tests and operates reliably from −40°C to +125°C ambient with <30Ω dynamic impedance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C2V4LT1G	2.4V nominal, ±5% tolerance, 300mW rating, same SOT23 package	Lower Zener voltage; higher Z_ZT (60Ω) reduces regulation precision under load variation	Acceptable where 2.4V reference suffices and tighter voltage stability is not required
MMBZ5221B-7-F	2.4V nominal, identical 350mW rating, 30Ω Z_ZT, same JEDEC qualification	0.1V lower regulation point; otherwise identical thermal and reliability profile	Select when system-level calibration requires exact 2.4V reference instead of 2.5V

Compared with BZX84-C2V4LT1G and MMBZ5221B-7-F, MMBZ5222B-7-F offers optimal balance of 2.5V regulation, low 30Ω impedance, and full automotive-grade reliability - making it preferred for precision analog sensing and safety-critical biasing where voltage headroom and stability are constrained.

Availability

MMBZ5222B-7-F is available at Aetrix Electronics and suitable for portable sensor reference, USB power rail clamp, and industrial PLC input conditioning requiring stable component supply across extended temperature ranges and high-volume production cycles.

Supply support for MMBZ5222B-7-F 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for industrial, automotive, and consumer markets with ISO/TS 16949 and IATF 16949 certified facilities.

This part belongs to the MMBZ52xxB series of 350mW Zener diodes, engineered for precision voltage regulation in space-constrained, thermally demanding applications where JEDEC reliability and RoHS/Green compliance are mandatory.

FAQ

What is the maximum continuous Zener current for MMBZ5222B-7-F at 25°C?

The device is rated for 20mA test current (I_ZT) and can sustain up to ~140mA continuously at 25°C ambient when mounted on FR-4 with recommended pad layout - calculated from P_D = 350mW and V_Z ≈ 2.5V. Derating applies above 25°C per Fig. 1 power curve.

Is MMBZ5222B-7-F qualified for automotive use?

Yes - it meets JEDEC high-reliability standards referenced in AEC-Q200, and Diodes Incorporated offers automotive-grade variants (Q-suffix) manufactured in IATF 16949 certified facilities. This standard part is suitable for non-safety-critical automotive subsystems including body electronics and infotainment power domains.

Does Pin 3 of the SOT23 package have an electrical function?

No - Pin 3 is internally unconnected (NC) and serves only as a mechanical support tab. It must remain unconnected in PCB layout and routing; connecting it may cause unintended thermal or electrical coupling due to proximity to the active die region.

How does the 30Ω Zener impedance affect circuit performance?

A 30Ω dynamic impedance means that for every 1mA change in Zener current, the output voltage shifts by ~30mV - critical for maintaining reference stability in circuits with variable load currents. Lower Z_ZT improves regulation accuracy, especially in low-noise analog signal chains and precision ADC bias networks.

MMBZ5222B-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 2.5 V

Tolerance:: ±5%

Power - Max:: 350 mW

Impedance (Max) (Zzt):: 30 Ohms

Current - Reverse Leakage @ Vr:: 100 µA @ 1 V

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

Operating Temperature:: -65°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

MMBZ5222B-7-F FAQ

1.How can I place an order for MMBZ5222B-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBZ5222B-7-F 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 MMBZ5222B-7-F reliable?

The price and inventory of MMBZ5222B-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5222B-7-F is usually 5 days.

3.What payment methods are accepted for MMBZ5222B-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5222B-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBZ5222B-7-F?

MMBZ5222B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBZ5222B-7-F 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 MMBZ5222B-7-F?

For technical support, including MMBZ5222B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5222B-7-F requirements.

6.How does Aetrix verify that MMBZ5222B-7-F is sourced from the original manufacturer or authorized distributors?

All MMBZ5222B-7-F 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 MMBZ5222B-7-F meets industry standards.

7.What is the process for return or replacement of MMBZ5222B-7-F?

All MMBZ5222B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5222B-7-F, 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 MMBZ5222B-7-F part is unused and in its original packaging.

Return procedure for MMBZ5222B-7-F:

1.Submit a request within 90 days.

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

Tech Hub

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…