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onsemi MMBZ5222BLT1
- Part No.:
- MMBZ5222BLT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5222BLT1.pdf
- Description:
- DIODE ZENER 2.5V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,051
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Product details
Overview
MMBZ5222BLT1 from onsemi is a 2.5 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board at 25°C, with 1250 Ω maximum Zener impedance at 20 mA test current and 0.25 μA reverse leakage at 1 V reverse voltage. It serves as a precision voltage reference or overvoltage clamp in low-power portable electronics.
For engineers reviewing the MMBZ5222BLT1 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 device operates as a two-terminal voltage regulator using avalanche breakdown in silicon PN junction. Its nominal Zener voltage of 2.5 V exhibits a temperature coefficient near zero (±0.002%/°C typical), enabling stable reference performance across −65°C to +150°C junction temperature range.
The SOT-23 package features a defined anode-cathode orientation (Pin 1 = Anode, Pin 2 = NC, Pin 3 = Cathode), thermally optimized for surface-mount reflow with 260°C/10s soldering tolerance and UL 94 V-0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.5 V nominal, 2.37–2.63 V min/max 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 DC power handling in standard PCB layouts |
| Zener Impedance (ZZT) | 1250 Ω max at IZT = 20 mA - determines AC regulation accuracy under dynamic load transients |
| Reverse Leakage (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 - guarantees robustness against electrostatic discharge during handling and assembly |
| Junction Temp Range | −65°C to +150°C - supports operation in automotive under-hood and industrial ambient environments |
Pinout & Package
SOT-23 (TO-236) plastic surface-mount package, 2.90 × 1.30 × 1.00 mm body size, void-free thermosetting case with corrosion-resistant finish; polarity band indicates cathode terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | DC current entry point during forward bias; connected to lower-potential node in Zener clamp configuration |
| Pin 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| Pin 3 | Cathode | DC current exit point during reverse breakdown; tied to regulated output or protected node |
Key Features
| Feature | Design Value |
|---|---|
| Pb-Free, Halogen-Free/BFR-Free | RoHS-compliant construction enables compliance with global environmental regulations without performance trade-offs |
| Small Form Factor | SOT-23 footprint saves >60% board area vs. DO-35, critical for high-density portable PCBs |
| Automated Assembly Optimized | Transfer-molded case geometry and solderable finish ensure >99.9% placement yield in pick-and-place processes |
| High ESD Robustness | Class 3 HBM rating eliminates need for external ESD protection in handheld interface circuits |
Applications
| Smartphone Power Management | IoT Sensor Node Reference |
|---|---|
Use Scenario: Clamping 3.3 V supply rail against transient spikes in LTE modem power domain. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing passive overvoltage protection without control logic. Use Value: Prevents damage to baseband ICs by limiting rail excursion to ≤2.63 V during ESD events or load dump. |
Use Scenario: Generating stable 2.5 V reference for 12-bit ADC in battery-powered environmental sensor. IC Role / Device Role / Timing Role: Precision voltage reference source with <±0.05 V tolerance over temperature. Use Value: Enables ±0.2% full-scale measurement accuracy without active voltage reference IC or trimming. |
| Wearable Health Monitor | Industrial PLC Input Protection |
Use Scenario: Regulating bias voltage for optical heart-rate sensor LED driver circuit. IC Role / Device Role / Timing Role: Low-quiescent-current Zener providing stable bias under pulsed LED loads. Use Value: Maintains consistent LED intensity across 0–45°C ambient with <0.5% drift, improving SpO₂ algorithm reliability. |
Use Scenario: Protecting 24 V digital input channel from field-wiring induced surges. IC Role / Device Role / Timing Role: Front-end clamp limiting input voltage to safe levels before optocoupler isolation stage. Use Value: Absorbs 225 mW surge energy without degradation, extending system MTBF beyond 10 years in factory environments. |
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 | 2.4 V nominal, 200 mW rating, 1000 Ω ZZT, same SOT-23 package | Lower clamping voltage; higher leakage (1 μA @ 1 V) | Select when tighter 2.4 V threshold is required and 0.25 μA leakage is non-critical |
| MMBZ5221BLT1G | 2.4 V nominal, identical 225 mW rating and 1200 Ω ZZT, same thermal specs | 0.1 V lower Zener voltage; same ESD and RoHS compliance | Choose for marginally lower regulation point while retaining identical board layout and reliability profile |
Compared with MMBZ5222BLT1, BZX84-C2V4LT1G offers lower voltage but reduced leakage performance, while MMBZ5221BLT1G provides a direct 0.1 V step-down alternative with identical thermal and mechanical behavior-enabling rapid voltage tuning without redesign.
Availability
MMBZ5222BLT1 is available at Aetrix Electronics and suitable for smartphone power management, IoT sensor node reference, wearable health monitor, and industrial PLC input protection requiring stable component supply across production lifecycles.
Supply support for MMBZ5222BLT1 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 power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZ52xxBLT1G series targets compact, high-reliability voltage regulation in portable and space-constrained electronics, emphasizing low-profile packaging, high ESD immunity, and tight Zener tolerance for precision analog functions.
FAQ
What is the exact Zener voltage tolerance for MMBZ5222BLT1 at 20 mA test current?
The MMBZ5222BLT1 has a guaranteed Zener voltage range of 2.37 V to 2.63 V at IZT = 20 mA and TA = 25°C, corresponding to ±5% tolerance around the 2.5 V nominal value. This specification is measured under pulse test conditions to avoid self-heating effects and is validated per onsemi's production test flow.
Does MMBZ5222BLT1 support reflow soldering, and what is its maximum allowable solder temperature?
Yes, MMBZ5222BLT1 supports standard lead-free reflow soldering. Its maximum case temperature is rated at 260°C for 10 seconds, fully compliant with IPC/JEDEC J-STD-020 moisture sensitivity level 1 requirements. The SOT-23 package uses a corrosion-resistant, easily solderable finish optimized for automated assembly.
Is Pin 2 of MMBZ5222BLT1 electrically connected internally?
No, Pin 2 of MMBZ5222BLT1 is a no-connect (NC) terminal with no internal bond wire or silicon connection. It must remain unconnected on the PCB - routing traces or placing vias to this pin may cause assembly defects or unintended parasitic coupling.
How does the thermal resistance of MMBZ5222BLT1 differ between FR-5 and alumina substrates?
MMBZ5222BLT1 exhibits RJA = 556°C/W on FR-5 board and RJA = 417°C/W on 99.5% alumina substrate at 25°C ambient. This 25% lower thermal resistance on ceramic enables 33% higher power handling (300 mW vs. 225 mW) before reaching the 150°C junction limit, useful in thermally demanding industrial designs.
What is the reverse leakage current specification for MMBZ5222BLT1 at 1 V reverse bias?
The MMBZ5222BLT1 specifies a maximum reverse leakage current (IR) of 0.25 μA at VR = 1 V and TA = 25°C. This ultra-low leakage ensures minimal quiescent current draw in always-on battery applications such as medical wearables and remote sensors where standby power budget is sub-10 μA.
MMBZ5222BLT1 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):
- 2.5 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)
MMBZ5222BLT1 FAQ
1.How can I place an order for MMBZ5222BLT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5222BLT1 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 MMBZ5222BLT1 reliable?
The price and inventory of MMBZ5222BLT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5222BLT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5222BLT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5222BLT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5222BLT1?
MMBZ5222BLT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5222BLT1 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 MMBZ5222BLT1?
For technical support, including MMBZ5222BLT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5222BLT1 requirements.
6.How does Aetrix verify that MMBZ5222BLT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5222BLT1 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 MMBZ5222BLT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5222BLT1?
All MMBZ5222BLT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5222BLT1, 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 MMBZ5222BLT1 part is unused and in its original packaging.
Return procedure for MMBZ5222BLT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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