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onsemi MMBZ5228ELT3G
- Part No.:
- MMBZ5228ELT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5228ELT3G.pdf
- Description:
- DIODE ZENER 3.9V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,887
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Product details
Overview
MMBZ5228ELT3G from onsemi is a 3.9 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation at 25°C, with 23 Ω dynamic impedance at 20 mA test current and 0.25 μA leakage current at 1 V reverse bias. It serves as a precision voltage reference or overvoltage clamp in low-power portable electronics.
For engineers reviewing the MMBZ5228ELT3G datasheet, pinout, applications, or equivalent options, key selection criteria include its 3.9 V nominal Zener voltage, 225 mW FR-5 board rating, SOT-23 footprint compatibility, Class 3 ESD robustness (>16 kV HBM), and thermal resistance of 556 °C/W.
Technical Context
This device operates in reverse breakdown to maintain stable voltage across its terminals under varying load or supply conditions. Its 3.9 V nominal Zener voltage is specified at 20 mA test current (IZT), with temperature coefficient near zero for this voltage range, minimizing drift over −65°C to +150°C junction temperature.
The SOT-23 package features Pin 1 (Anode), Pin 2 (No Connection), and Pin 3 (Cathode), enabling unidirectional clamping or regulation. With 1900 Ω maximum Zener impedance at knee current (IZK = 0.25 mA) and 10 μA leakage at VR = 1 V, it supports low-current biasing and signal-level protection without excessive loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.70–4.10 V @ IZT = 20 mA - defines stable regulation point for low-voltage rail stabilization |
| Power Dissipation (PD) | 225 mW @ TA = 25°C on FR-5 board - sets maximum continuous power handling in standard PCB layouts |
| Zener Impedance (ZZT) | 23 Ω @ IZT = 20 mA - indicates low AC impedance for effective ripple suppression in reference circuits |
| Leakage Current (IR) | 0.25 μA @ VR = 1 V - ensures minimal standby current draw in battery-powered systems |
| ESD Rating | Class 3 (>16 kV HBM) - provides robust handling during automated assembly and end-use electrostatic environments |
| Junction Temp Range | −65°C to +150°C - supports operation in automotive under-hood and industrial ambient conditions |
| Thermal Resistance (RJA) | 556 °C/W - determines temperature rise per watt on standard FR-5 board; critical for thermal margin analysis |
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. Cathode indicated by polarity band. Pb-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Anode connection | Connected to lower-potential node in reverse-bias configuration; must be held ≤ VZ below cathode for regulation |
| 2 (NC) | No connection | Internally unconnected; no PCB trace or pad required; electrically isolated |
| 3 (Cathode) | Cathode connection | Connected to regulated output or protected node; polarity band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW power rating on FR-5 board | Enables use in space-constrained, low-power applications without external heatsinking |
| Class 3 ESD robustness (>16 kV HBM) | Eliminates need for external ESD protection in handheld and portable designs |
| Pb-free and RoHS-compliant packaging | Meets global environmental compliance requirements for commercial and industrial shipments |
| Small SOT-23 footprint | Supports high-density PCB layouts in cellular phones, wearables, and IoT sensor nodes |
| Low leakage at 1 V reverse bias | Reduces quiescent current in always-on monitoring circuits and battery-backed systems |
Applications
| Portable Power Rail Clamping | Low-Voltage Reference Generation |
|---|---|
|
Use Scenario: Protecting 3.3 V I/O lines in Bluetooth headsets against transient overvoltage events. IC Role / Device Role / Timing Role: Zener clamping diode placed between I/O pin and ground to shunt surge energy. Use Value: 3.9 V breakdown threshold ensures clamping occurs before damage to 3.3 V logic, while 225 mW rating handles short-duration transients. |
Use Scenario: Providing stable bias voltage for op-amp comparators in smart thermostat sensors. IC Role / Device Role / Timing Role: Two-terminal voltage reference sourcing <100 μA to comparator input. Use Value: 3.9 V nominal Zener voltage with ±5% tolerance and low ZZT enables accurate trip-point setting without trimming. |
| Battery Voltage Monitoring | USB-C Port Protection |
|
Use Scenario: Detecting end-of-charge in single-cell Li-ion battery packs using resistive divider feedback. IC Role / Device Role / Timing Role: Precision Zener referenced to battery anode for analog-to-digital conversion scaling. Use Value: Low 0.25 μA leakage at 1 V ensures negligible impact on battery self-discharge over months of storage. |
Use Scenario: Clamp VBUS line against overvoltage during hot-plug events in USB-C peripheral adapters. IC Role / Device Role / Timing Role: Reverse-biased Zener connected between VBUS and ground to limit peak voltage. Use Value: 225 W peak pulse capability (8 × 20 μs) absorbs ESD and contact bounce energy 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-C3V9LT1G | Same 3.9 V nominal Zener, but 300 mW rating and 60 Ω ZZT @ 5 mA - higher power, higher impedance | Preferred where higher surge energy absorption is needed, but less suitable for low-noise reference use | Select BZX84-C3V9LT1G when board layout allows larger thermal margin or when 5 mA test current aligns with system bias design |
| MMBZ5228BS | Same electrical specs, but in SOD-123 package - 3.7 × 2.7 × 1.2 mm vs. SOT-23's 2.9 × 1.3 × 1.0 mm | Better thermal performance (RJA ≈ 350 °C/W), but occupies ~2.5× more PCB area | Choose MMBZ5228BS only if thermal derating dominates over board space constraints in high-ambient environments |
Compared with BZX84-C3V9LT1G and MMBZ5228BS, the MMBZ5228ELT3G offers optimal balance of ultra-compact size, low dynamic impedance, and proven manufacturability in high-volume SMT lines - making it preferred for space-limited consumer electronics where 20 mA regulation current and 225 mW dissipation are sufficient.
Availability
MMBZ5228ELT3G is available at Aetrix Electronics and suitable for cellular phones, handheld portables, and high-density PC boards requiring stable component supply and full RoHS compliance.
Supply support for MMBZ5228ELT3G 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MMBZ52xxELT3G series belongs to onsemi's precision Zener voltage regulator product line, engineered specifically for miniaturized, high-reliability voltage reference and transient protection in portable and space-constrained electronics.
FAQ
What is the nominal Zener voltage of MMBZ5228ELT3G and how tightly is it specified?
The MMBZ5228ELT3G has a nominal Zener voltage of 3.9 V, with a guaranteed range of 3.70 V to 4.10 V at 20 mA test current (IZT). This ±5% tolerance is confirmed in the Electrical Characteristics table on page 2 of the official onsemi datasheet, ensuring predictable regulation behavior in low-voltage bias and clamp applications.
Does MMBZ5228ELT3G have a no-connect pin, and how is it identified in the SOT-23 package?
Yes, MMBZ5228ELT3G uses Pin 2 as a no-connect (NC) terminal in its SOT-23 package. Per the mechanical outline on page 6 of the datasheet (Style 8), Pin 1 is Anode, Pin 2 is NC, and Pin 3 is Cathode - verified by the "Pinout: 1-Anode, 2-NC, 3-Cathode" note in the Electrical Characteristics section.
What is the maximum power dissipation of MMBZ5228ELT3G on a standard FR-5 PCB?
MMBZ5228ELT3G is rated for 225 mW total power dissipation on FR-5 board at 25°C ambient temperature, with a derating factor of 1.8 mW/°C above that temperature. This value is explicitly listed in the Maximum Ratings table under "Total Power Dissipation on FR−5 Board" and applies directly to MMBZ5228ELT3G as part of the MMBZ52xxELT1G series.
How does the ESD robustness of MMBZ5228ELT3G compare to standard human-body model requirements?
MMBZ5228ELT3G achieves Class 3 ESD rating (>16 kV) per Human Body Model (HBM), as stated in the Features section of the datasheet. This exceeds the common IEC 61000-4-2 Level 4 requirement (8 kV contact) and ensures reliable handling during automated placement and end-user operation without additional protection circuitry.
Can MMBZ5228ELT3G be used as a replacement for older MMBZ5228ELT1G parts?
Yes, MMBZ5228ELT3G is a direct replacement for MMBZ5228ELT1G - both share identical electrical specifications, SOT-23 package, and Pb-free construction. The "T3G" suffix denotes 10,000-piece tape-and-reel packaging, whereas "T1G" is 3,000-piece; functionally and electrically, MMBZ5228ELT3G performs identically to MMBZ5228ELT1G in all circuit roles.
MMBZ5228ELT3G 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):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 23 Ohms
- Current - Reverse Leakage @ Vr:
- 10 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)
MMBZ5228ELT3G FAQ
1.How can I place an order for MMBZ5228ELT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5228ELT3G 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 MMBZ5228ELT3G reliable?
The price and inventory of MMBZ5228ELT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5228ELT3G is usually 5 days.
3.What payment methods are accepted for MMBZ5228ELT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5228ELT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5228ELT3G?
MMBZ5228ELT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5228ELT3G 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 MMBZ5228ELT3G?
For technical support, including MMBZ5228ELT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5228ELT3G requirements.
6.How does Aetrix verify that MMBZ5228ELT3G is sourced from the original manufacturer or authorized distributors?
All MMBZ5228ELT3G 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 MMBZ5228ELT3G meets industry standards.
7.What is the process for return or replacement of MMBZ5228ELT3G?
All MMBZ5228ELT3G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5228ELT3G, 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 MMBZ5228ELT3G part is unused and in its original packaging.
Return procedure for MMBZ5228ELT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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