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onsemi MMBZ5221BLT3G
- Part No.:
- MMBZ5221BLT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5221BLT3G.pdf
- Description:
- DIODE ZENER 2.4V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,600
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Product details
Overview
MMBZ5221BLT3G from onsemi is a 2.4 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board at 25°C, with 1200 Ω dynamic impedance at 20 mA test current and 0.25 μA leakage at 1 V reverse bias. It serves as a precision voltage reference or overvoltage clamp in low-power portable electronics.
For engineers reviewing the MMBZ5221BLT3G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, ESD robustness (Class 3, >16 kV HBM), and real-world use cases in space-constrained DC regulation circuits.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load or supply conditions. Its 2.4 V nominal Zener voltage exhibits a negative temperature coefficient near zero crossing, minimizing drift in ambient temperature ranges from −65°C to +150°C.
The device features a no-connect (NC) terminal (Pin 2), enabling simplified PCB layout and eliminating unintended parasitic paths. Its SOT-23 package supports automated placement and reflow soldering at 260°C for 10 seconds, with UL 94 V-0 flammability rating and Pb-free, RoHS-compliant construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.4 V nominal, 2.28–2.52 V range at 20 mA - defines precise clamping threshold for low-voltage rail protection |
| Power Dissipation (PD) | 225 mW on FR-5 board at 25°C, derated 1.8 mW/°C above - sets maximum continuous power handling in standard PCB environments |
| Zener Impedance (ZZT) | 1200 Ω max at IZT = 20 mA - indicates voltage regulation stability under moderate current variation |
| Leakage Current (IR) | 0.25 μA max at VR = 1 V - ensures minimal standby current draw in battery-powered systems |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - provides robust electrostatic discharge immunity without external protection |
| Junction Temperature Range | −65°C to +150°C - supports operation in extended industrial and automotive under-hood environments |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting plastic case with corrosion-resistant finish and cathode polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential side of regulated node; forward-biased during normal conduction |
| 2 | No Connection | Internally unconnected; must remain floating - no routing or grounding required |
| 3 | Cathode | Connected to higher-potential side; reverse-biased during Zener operation to establish regulated voltage |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW power rating on FR-5 board | Enables compact voltage regulation in high-density layouts without heatsinking |
| ESD robustness >16 kV HBM | Eliminates need for discrete ESD protection in handheld and portable designs |
| Pb-free, halogen-free, RoHS-compliant | Meets global environmental compliance requirements for consumer and industrial products |
| UL 94 V-0 flammability rating | Ensures flame-retardant behavior in safety-critical end equipment |
Applications
| USB Port Protection | Low-Voltage Microcontroller Reference |
|---|---|
Use Scenario: Clamping transient surges on 3.3 V or 2.5 V USB data lines in portable accessories. IC Role / Device Role / Timing Role: Voltage clamp limiting line voltage to safe levels during ESD events or hot-plug transients. Use Value: Prevents damage to downstream PHY ICs while maintaining signal integrity due to low capacitance and fast response. |
Use Scenario: Providing stable 2.4 V reference for ADC input scaling or brown-out detection in battery-powered IoT sensors. IC Role / Device Role / Timing Role: Precision shunt reference establishing known voltage threshold for analog monitoring circuits. Use Value: Enables accurate low-power voltage monitoring with <±5% tolerance and negligible quiescent current drain. |
| Cellular Phone Power Rail Clamp | High-Density PC Board Voltage Regulation |
Use Scenario: Protecting RF front-end bias rails from supply spikes in LTE/5G handset power management modules. IC Role / Device Role / Timing Role: Overvoltage suppression element placed directly at LDO output or PA bias node. Use Value: Absorbs short-duration energy transients without affecting RF performance, leveraging SOT-23 footprint compatibility. |
Use Scenario: Localized voltage stabilization for memory or interface ICs on dense server motherboard VRM outputs. IC Role / Device Role / Timing Role: Point-of-load Zener regulator compensating for trace IR drop and noise coupling. Use Value: Delivers localized regulation with minimal board area impact-critical where space prohibits larger packages or active regulators. |
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-C2V4LT1G | Same 2.4 V nominal Zener, but 350 mW rating on FR-4 and higher 2500 Ω ZZT at 5 mA | Higher power handling suits higher-current clamping; less precise regulation at low currents | Select when higher surge energy absorption is needed and tighter impedance at 20 mA is not required |
| MMBZ5221BS-TP | Identical electrical specs, but in SOT-323 package (smaller 2.0 × 1.25 × 0.95 mm) and 3000/reel packaging | Smaller footprint enables ultra-high-density layouts; lower thermal mass affects transient power handling | Select when board space is more constrained than thermal margin, and volume packaging differs |
Compared with BZX84-C2V4LT1G and MMBZ5221BS-TP, the MMBZ5221BLT3G offers optimal balance of low dynamic impedance at standard test current, industry-standard SOT-23 manufacturability, and 10,000/reel logistics support for high-volume production.
Availability
MMBZ5221BLT3G is available at Aetrix Electronics and suitable for cellular phones, hand-held portables, and high-density PC boards requiring stable component supply, consistent parametric performance, and full RoHS compliance.
Supply support for MMBZ5221BLT3G 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 belongs to onsemi's Zener voltage regulator product line, engineered specifically for space-constrained, low-power voltage reference and overvoltage protection in portable and high-density electronic systems.
FAQ
What is the Zener voltage tolerance for MMBZ5221BLT3G?
The MMBZ5221BLT3G has a Zener voltage tolerance of ±5% around its nominal 2.4 V rating, meaning the actual measured VZ falls between 2.28 V and 2.52 V at 20 mA test current and 25°C ambient temperature. This tolerance is guaranteed per onsemi's Electrical Characteristics table and applies to all units shipped under this part number.
Does MMBZ5221BLT3G have a functional third pin?
No, Pin 2 of the MMBZ5221BLT3G is internally not connected (NC). The device uses only Pins 1 (Anode) and 3 (Cathode) for electrical operation. Leaving Pin 2 unconnected on the PCB is required - routing or grounding it may cause assembly defects or reliability issues.
What is the maximum allowable junction temperature for MMBZ5221BLT3G?
The MMBZ5221BLT3G has a specified junction and storage temperature range of −65°C to +150°C. Operation beyond +150°C risks permanent degradation of Zener characteristics and package integrity. Derating curves in the datasheet define safe power limits at elevated ambient temperatures.
Can MMBZ5221BLT3G be used in automotive applications?
The standard MMBZ5221BLT3G is not AEC-Q101 qualified. For automotive use, the SZMMBZ5221BLT3G variant - identified by the "SZ" prefix - is required. It meets AEC-Q101 stress testing, PPAP capability, and site-specific control requirements mandated for automotive electronics.
How does the 225 mW power rating of MMBZ5221BLT3G translate to real-world thermal performance?
The 225 mW rating for MMBZ5221BLT3G applies specifically to FR-5 board construction at 25°C ambient. Above that temperature, power must be linearly derated by 1.8 mW/°C. On alumina substrate, the rating increases to 300 mW - so thermal performance depends critically on PCB material, copper area, and airflow, not just the device itself.
MMBZ5221BLT3G 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):
- 2.4 V
- Tolerance:
- ±5%
- Power - Max:
- 225 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:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
MMBZ5221BLT3G FAQ
1.How can I place an order for MMBZ5221BLT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5221BLT3G 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 MMBZ5221BLT3G reliable?
The price and inventory of MMBZ5221BLT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5221BLT3G is usually 5 days.
3.What payment methods are accepted for MMBZ5221BLT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5221BLT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5221BLT3G?
MMBZ5221BLT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5221BLT3G 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 MMBZ5221BLT3G?
For technical support, including MMBZ5221BLT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5221BLT3G requirements.
6.How does Aetrix verify that MMBZ5221BLT3G is sourced from the original manufacturer or authorized distributors?
All MMBZ5221BLT3G 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 MMBZ5221BLT3G meets industry standards.
7.What is the process for return or replacement of MMBZ5221BLT3G?
All MMBZ5221BLT3G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5221BLT3G, 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 MMBZ5221BLT3G part is unused and in its original packaging.
Return procedure for MMBZ5221BLT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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