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onsemi MMBZ5225BLT1
- Part No.:
- MMBZ5225BLT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5225BLT1.pdf
- Description:
- DIODE ZENER 3V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,884
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Product details
Overview
MMBZ5225BLT1 from onsemi is a 3.0 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 29 Ω dynamic impedance at 20 mA test current and 0.25 μA leakage at 1 V reverse bias. It provides precision voltage regulation in space-constrained portable electronics.
For engineers reviewing the MMBZ5225BLT1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal behavior, ESD robustness (Class 3, >16 kV HBM), and real-world use context for low-voltage rail clamping and reference stabilization.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown at nominal 3.0 V with tight tolerance (±5%) and low temperature coefficient near zero crossing. Its 29 Ω Zener impedance at IZT = 20 mA ensures stable regulation under moderate load transients.
Designed for surface-mount assembly on FR-4/FR-5 PCBs, it features a cathode-banded SOT-23 package with Pin 1 = Anode, Pin 2 = No Connection, Pin 3 = Cathode. Thermal resistance is 556 °C/W junction-to-ambient on FR-5 substrate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.85–3.15 V @ IZT = 20 mA - defines precise clamping threshold for 3.3 V rail protection |
| Power Dissipation (PD) | 225 mW @ TA = 25°C on FR-5 - limits continuous current to ~75 mA at 3 V without derating |
| Zener Impedance (ZZT) | 29 Ω @ IZT = 20 mA - determines output voltage deviation under 1 mA load change (ΔV ≈ 29 mV) |
| Leakage Current (IR) | 0.25 μA @ VR = 1 V - ensures minimal quiescent current draw in standby mode |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct integration into handheld device I/O lines without external protection |
| Junction Temp Range | −65°C to +150°C - supports operation in automotive cabin and industrial ambient environments |
Pinout & Package
SOT-23 (TO-236) package: 2.90 mm × 1.30 mm × 1.00 mm body, 1.90 mm lead pitch, void-free thermosetting plastic case with corrosion-resistant finish. Cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; reverse-biased during regulation |
| 2 | No Connection | Internally unconnected; must remain floating in PCB layout |
| 3 | Cathode | Connected to regulated voltage node; carries full Zener current |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW FR-5 power rating | Enables compact 3.3 V rail clamping without heatsinking in thin-profile PCBs |
| ESD Class 3 (>16 kV HBM) | Eliminates need for discrete TVS on low-speed I/O lines in consumer portables |
| Pb-free, RoHS-compliant | Meets global environmental compliance for shipped end-products without exemption requests |
| Small SOT-23 footprint | Reduces board area by >60% vs. DO-35 glass diodes, enabling high-density mobile designs |
Applications
| USB Data Line Protection | Low-Voltage Microcontroller Reset Circuit |
|---|---|
Use Scenario: Clamping transient overvoltage on USB 2.0 D+ and D− lines during hot-plug events. IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing surge energy while holding line voltage ≤3.3 V. Use Value: Prevents latch-up in USB transceivers by limiting peak voltage to 3.15 V with <29 Ω dynamic impedance. |
Use Scenario: Generating a stable 3.0 V reference for microcontroller reset comparator input. IC Role / Device Role / Timing Role: Precision voltage reference source with ±5% tolerance and low tempco near zero crossing. Use Value: Ensures reliable reset assertion across −40°C to +85°C without calibration or trimming. |
| Portable Battery Monitor Reference | IoT Sensor Signal Conditioning |
Use Scenario: Providing reference voltage for ADC measurement of Li-ion cell voltage in wearables. IC Role / Device Role / Timing Role: Low-leakage (0.25 μA @ 1 V) Zener reference stabilizing ADC reference divider. Use Value: Minimizes battery drain in always-on monitoring mode while maintaining 0.15 V regulation accuracy. |
Use Scenario: Biasing op-amp input stage in ultra-low-power environmental sensor front-end. IC Role / Device Role / Timing Role: Low-noise, low-capacitance (<5 pF typical) voltage clamp for analog signal path. Use Value: Suppresses RF coupling and ESD without degrading 10 kHz sensor bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C3V0 | Same 3.0 V nominal, but 350 mW rating and 90 Ω ZZT; SOT-23 package with identical pinout | Higher power handling suits higher-current clamping; higher impedance reduces regulation precision | Select when surge energy exceeds 225 mW but layout cannot accommodate larger package |
| MMBZ5225BS | Same electrical specs, but in SOD-323 package (1.7 × 1.25 mm); 200 mW rating on FR-5 | Smaller footprint saves area but requires tighter assembly tolerances; lower power margin | Select for ultra-high-density layouts where 0.25 mm² reduction outweighs 25 mW derating |
Compared with BZX84-C3V0 and MMBZ5225BS, the MMBZ5225BLT1 offers optimal balance of regulation precision (29 Ω ZZT), ESD robustness (>16 kV), and manufacturability in standard SOT-23 pick-and-place lines-making it preferred for cost-sensitive, high-volume portable designs requiring repeatable 3.0 V clamping.
Availability
MMBZ5225BLT1 is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset circuits, battery voltage monitoring, and IoT sensor signal conditioning requiring stable component supply across production lifecycles.
Supply support for MMBZ5225BLT1 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications with focus on sustainability and reliability.
The MMBZ52xxBLT1G series targets space-constrained, high-volume portable electronics-designed specifically for voltage regulation, overvoltage clamping, and reference generation where SOT-23 footprint, ESD immunity, and tight Zener tolerance are critical.
FAQ
What is the exact Zener voltage tolerance for MMBZ5225BLT1?
The MMBZ5225BLT1 has a guaranteed Zener voltage range of 2.85 V to 3.15 V at 20 mA test current (IZT), corresponding to ±5% tolerance around the nominal 3.0 V value. This is specified in the Electrical Characteristics table on page 3 of the official onsemi datasheet, with no derating required at 25°C ambient.
Does MMBZ5225BLT1 have a functional pin 2 connection?
No, pin 2 of the MMBZ5225BLT1 is explicitly designated as "No Connection" per the marking diagram and mechanical outline documentation. It is internally unconnected and must remain floating in PCB layout-neither grounded nor tied to any net-to avoid unintended parasitic paths or assembly defects.
Can MMBZ5225BLT1 be used for 3.3 V rail clamping in USB 2.0 applications?
Yes, the MMBZ5225BLT1 is routinely applied for 3.3 V rail clamping in USB 2.0 interfaces. With a maximum Zener voltage of 3.15 V and Class 3 ESD rating (>16 kV HBM), it reliably clamps transients below the 3.6 V absolute maximum rating of most USB transceivers while adding negligible capacitance (<5 pF) to the data path.
What is the thermal resistance of MMBZ5225BLT1 on standard FR-5 PCB?
The junction-to-ambient thermal resistance (RJA) of MMBZ5225BLT1 is 556 °C/W when mounted on an FR-5 board, as specified in the Maximum Ratings table. This value assumes standard 1.0 × 0.75 × 0.62 inch board dimensions and governs allowable power dissipation above 25°C ambient (derated at 1.8 mW/°C).
Is MMBZ5225BLT1 compliant with automotive qualification standards?
No, the base MMBZ5225BLT1 is not AEC-Q101 qualified. The automotive-grade variant is the SZMMBZ5225BLT1G, which carries the "SZ" prefix and is explicitly stated as AEC-Q101 qualified and PPAP capable. For non-automotive portable and industrial applications, the MMBZ5225BLT1 meets all standard commercial reliability requirements.
MMBZ5225BLT1 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 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 29 Ohms
- Current - Reverse Leakage @ Vr:
- 50 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)
MMBZ5225BLT1 FAQ
1.How can I place an order for MMBZ5225BLT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5225BLT1 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 MMBZ5225BLT1 reliable?
The price and inventory of MMBZ5225BLT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5225BLT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5225BLT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5225BLT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5225BLT1?
MMBZ5225BLT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5225BLT1 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 MMBZ5225BLT1?
For technical support, including MMBZ5225BLT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5225BLT1 requirements.
6.How does Aetrix verify that MMBZ5225BLT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5225BLT1 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 MMBZ5225BLT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5225BLT1?
All MMBZ5225BLT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5225BLT1, 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 MMBZ5225BLT1 part is unused and in its original packaging.
Return procedure for MMBZ5225BLT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5225BLT1 Tags
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