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onsemi MMBZ5226BLT3G
- Part No.:
- MMBZ5226BLT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5226BLT3G.pdf
- Description:
- DIODE ZENER 3.3V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,701
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Product details
Overview
MMBZ5226BLT3G from onsemi is a 3.3 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 28 Ω dynamic impedance at 20 mA test current and 25 μA reverse leakage at 1 V. It provides precision voltage regulation in space-constrained portable electronics such as smartphone power rails and USB interface protection circuits.
For engineers reviewing the MMBZ5226BLT3G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (556 °C/W), ESD robustness (>16 kV HBM), and SOT-23 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal voltage reference diode with cathode-anode polarity, requiring no external biasing circuitry. Its Zener breakdown mechanism delivers stable regulation across −65°C to +150°C junction temperature range, with temperature coefficient near zero at its nominal 3.3 V rating.
The SOT-23 package features a defined pinout (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode) and supports automated placement. Thermal performance is specified for both FR-5 board (225 mW @ 25°C) and alumina substrate (300 mW @ 25°C), enabling use in thermally demanding environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.3 V nominal, 3.13–3.47 V range at 20 mA - defines regulated output voltage under standard test conditions |
| Power Dissipation (PD) | 225 mW on FR-5 board @ 25°C - maximum continuous power before thermal derating begins |
| Zener Impedance (ZZT) | 28 Ω @ IZT = 20 mA - low dynamic impedance ensures minimal output voltage variation under load changes |
| Reverse Leakage (IR) | 25 μA @ VR = 1 V - low leakage preserves battery life in always-on standby circuits |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct integration into handheld device I/O lines without additional ESD protection |
| Junction Temperature Range | −65°C to +150°C - supports operation in automotive under-hood and industrial control environments |
| Forward Voltage (VF) | 0.95 V max @ IF = 10 mA - allows use as clamping diode in bidirectional signal protection |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 mm × 1.30 mm × 1.00 mm body size, Pb-free and RoHS compliant. Cathode identified by polarity band; Pin 2 is internally unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential side of regulated node; reverse-biased during Zener operation |
| Pin 2 | No Connection | Internally isolated; must remain floating - no PCB trace or pad connection required |
| Pin 3 | Cathode | Connected to higher-potential side (e.g., supply rail); carries full Zener current during regulation |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW power rating on FR-5 board | Enables compact voltage clamping in space-limited mobile PCBs without heatsinking |
| ESD rating >16 kV (HBM) | Eliminates need for discrete TVS diodes on low-speed data lines like I²C or GPIO |
| Zener voltage tolerance ±5% | Meets tight regulation requirements for 3.3 V logic supply monitoring and reference applications |
| Pb-free, halogen-free, RoHS-compliant | Supports global environmental compliance without sacrificing electrical performance |
| Optimized for automated assembly | Standard SOT-23 footprint ensures compatibility with pick-and-place equipment and reflow profiles |
Applications
| USB Port Protection | Smartphone Power Rail Clamping |
|---|---|
Use Scenario: Protecting USB 2.0 D+ and D− lines from ESD transients and overvoltage events. IC Role / Device Role / Timing Role: Bidirectional clamping diode referenced to 3.3 V supply, conducting transient energy to ground or VCC. Use Value: Leverages 3.3 V Zener voltage and >16 kV HBM rating to absorb IEC 61000-4-2 Level 4 surges without external components. |
Use Scenario: Stabilizing auxiliary 3.3 V LDO output in battery-powered smartphones during RF transmission bursts. IC Role / Device Role / Timing Role: Shunt regulator maintaining reference point stability during rapid load-current transients. Use Value: 28 Ω Zener impedance minimizes voltage droop (<84 mV at 3 mA step change), preserving PMIC feedback accuracy. |
| IoT Sensor Node Reference | Industrial PLC Input Conditioning |
Use Scenario: Providing stable 3.3 V reference for ADC sampling of analog sensor outputs in wireless nodes. IC Role / Device Role / Timing Role: Precision voltage reference source with low temperature coefficient near 3.3 V. Use Value: Tight 3.13–3.47 V tolerance and −65°C to +150°C operation ensure <0.5% reference drift across environmental extremes. |
Use Scenario: Level-shifting and overvoltage protection for 24 V digital inputs in programmable logic controllers. IC Role / Device Role / Timing Role: Front-end clamp limiting input voltage swing to safe levels for downstream optocouplers. Use Value: 225 mW rating and 556 °C/W thermal resistance allow sustained 100 ms overvoltage events without failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C3V3LT1G | Same 3.3 V nominal Zener, but 300 mW rating and 60 Ω ZZT; slightly larger thermal resistance (625 °C/W) | Higher power handling suits 125°C ambient industrial sensors; higher impedance reduces regulation precision | Select when higher surge energy absorption is needed and tighter voltage regulation is secondary |
| MMBZ5226BS-TP | Identical electrical specs but SOD-123 package (3.7 mm × 1.6 mm); 350 mW rating on FR-4 | Larger footprint eases hand-soldering and improves thermal margin; incompatible with SOT-23 pick-and-place feeders | Select for prototyping or low-volume production where manual assembly or thermal headroom outweighs density constraints |
Compared with BZX84-C3V3LT1G and MMBZ5226BS-TP, the MMBZ5226BLT3G offers optimal balance of SOT-23 miniaturization, 28 Ω low-impedance regulation, and Class 3 ESD robustness - making it preferred for high-density portable designs where board space and transient immunity are co-critical.
Availability
MMBZ5226BLT3G is available at Aetrix Electronics and suitable for smartphone power management, USB interface protection, IoT sensor reference circuits, and industrial PLC input conditioning requiring stable component supply and long-term lifecycle support.
Supply support for MMBZ5226BLT3G 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZ52xxBLT3G series is part of onsemi's precision Zener voltage regulator portfolio, engineered specifically for space-constrained, high-reliability portable and industrial systems requiring stable reference voltages and robust ESD immunity.
FAQ
What is the Zener voltage tolerance of MMBZ5226BLT3G?
The MMBZ5226BLT3G has a Zener voltage tolerance of ±5% around its nominal 3.3 V rating, meaning the actual measured VZ falls between 3.13 V and 3.47 V at 20 mA test current and 25°C ambient. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet. The MMBZ5226BLT3G maintains this specification across its qualified operating temperature range.
Does MMBZ5226BLT3G have a functional pin 2?
No, pin 2 of the MMBZ5226BLT3G is a no-connect terminal - it is not bonded internally and must remain electrically floating on the PCB. The device functions solely between pin 1 (anode) and pin 3 (cathode), as explicitly stated in the marking diagram and mechanical outline documentation. Connecting pin 2 on the MMBZ5226BLT3G risks compromising reliability or violating the specified SOT-23 layout rules.
What is the maximum power dissipation of MMBZ5226BLT3G on a standard PCB?
The MMBZ5226BLT3G is rated for 225 mW total power dissipation on an 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 reflects real-world thermal performance on typical consumer-grade PCBs. The MMBZ5226BLT3G achieves this rating without heatsinking due to its optimized SOT-23 thermal path.
Is MMBZ5226BLT3G suitable for automotive applications?
The MMBZ5226BLT3G itself is not AEC-Q101 qualified; however, the automotive-grade variant SZMMBZ5226BLT3G is fully qualified and PPAP-capable. For non-automotive industrial or consumer use, the MMBZ5226BLT3G meets all electrical and environmental requirements including −65°C to +150°C junction temperature range and >16 kV HBM ESD rating. Always specify SZMMBZ5226BLT3G when automotive qualification is mandatory.
How does the ESD rating of MMBZ5226BLT3G compare to standard I/O protection requirements?
The MMBZ5226BLT3G delivers Class 3 Human Body Model ESD immunity (>16 kV), exceeding IEC 61000-4-2 Level 4 (8 kV contact / 15 kV air) requirements for most commercial and industrial end-equipment. This allows the MMBZ5226BLT3G to serve as primary ESD suppression on low-speed signal lines - eliminating secondary protection devices in designs such as GPIO interfaces or sensor buses where 3.3 V clamping is appropriate.
MMBZ5226BLT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 28 Ohms
- Current - Reverse Leakage @ Vr:
- 25 µA @ 1 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)
MMBZ5226BLT3G FAQ
1.How can I place an order for MMBZ5226BLT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5226BLT3G 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 MMBZ5226BLT3G reliable?
The price and inventory of MMBZ5226BLT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5226BLT3G is usually 5 days.
3.What payment methods are accepted for MMBZ5226BLT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5226BLT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5226BLT3G?
MMBZ5226BLT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5226BLT3G 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 MMBZ5226BLT3G?
For technical support, including MMBZ5226BLT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5226BLT3G requirements.
6.How does Aetrix verify that MMBZ5226BLT3G is sourced from the original manufacturer or authorized distributors?
All MMBZ5226BLT3G 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 MMBZ5226BLT3G meets industry standards.
7.What is the process for return or replacement of MMBZ5226BLT3G?
All MMBZ5226BLT3G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5226BLT3G, 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 MMBZ5226BLT3G part is unused and in its original packaging.
Return procedure for MMBZ5226BLT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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