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onsemi MMBZ5221BLT1
- Part No.:
- MMBZ5221BLT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5221BLT1.pdf
- Description:
- DIODE ZENER 2.4V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,109
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Product details
Overview
MMBZ5221BLT1 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 MMBZ5221BLT1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (556 °C/W), ESD rating (>16 kV HBM), cathode-anode polarity marking, and compatibility with automated SMT assembly on high-density PCBs.
Technical Context
This device operates as a two-terminal silicon Zener diode with sharp reverse breakdown at nominal 2.4 V. Its design targets stable voltage regulation under low-current conditions (IZT = 20 mA), with minimal temperature coefficient drift across −65°C to +150°C junction range.
The SOT-23 package features void-free thermosetting plastic construction, UL 94 V-0 flammability rating, and polarity band indicating cathode. Pin 2 is internally unconnected - confirmed by mechanical outline Style 8 and electrical characteristics table.
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 - sets maximum continuous power handling without derating |
| Zener Impedance (ZZT) | 1200 Ω max at IZT = 20 mA - indicates voltage stability under small-signal AC load variations |
| 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 - enables robust handling in manual assembly and field environments |
| Junction Temperature Range | −65°C to +150°C - supports operation in automotive under-hood and industrial ambient conditions |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 × 1.30 × 1.00 mm body size, with cathode indicated by polarity band. Pin 2 is internally not connected (NC), confirmed by mechanical outline Style 8 and Electrical Characteristics footnote.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward-biased terminal; connects to lower-potential node during regulation |
| 2 | No Connection | Internally isolated - must remain unconnected on PCB; no routing or soldering required |
| 3 | Cathode | Reverse-biased terminal; connects to higher-potential node and carries regulated output current |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW FR-5 board rating | Enables use in space-constrained handheld devices without forced cooling or heatsinking |
| ESD immunity >16 kV HBM | Eliminates need for external ESD protection in consumer-grade portable designs |
| Pb-free, RoHS-compliant packaging | Meets global environmental compliance requirements for commercial and industrial shipments |
| Small SOT-23 footprint | Supports ≥10,000 components per square inch on high-density PC boards |
Applications
| Smartphone Power Management | Wearable Sensor Biasing |
|---|---|
|
Use Scenario: Clamping 3.3 V LDO output against transient spikes in LTE modem power domain. IC Role / Device Role / Timing Role: Voltage reference and overvoltage protector for RF front-end ICs. Use Value: Prevents latch-up in sensitive transceivers using 2.4 V Zener threshold aligned with internal logic thresholds. |
Use Scenario: Providing stable bias voltage to MEMS accelerometer analog front-end in fitness tracker. IC Role / Device Role / Timing Role: Low-current precision reference source for sensor signal conditioning. Use Value: Maintains <±1% output accuracy across −20°C to +70°C ambient with <0.25 μA leakage. |
| USB-C Port Protection | Industrial IoT Node Regulation |
|
Use Scenario: Reverse-polarity and overvoltage protection on 5 V USB-C VBUS line before buck converter input. IC Role / Device Role / Timing Role: Clamp diode in series-shunt protection architecture. Use Value: Absorbs 225 mW surge energy without degradation, leveraging 1200 Ω ZZT to limit peak clamped voltage. |
Use Scenario: Regulating 2.4 V supply for ultra-low-power microcontroller reset circuit in remote sensor node. IC Role / Device Role / Timing Role: Standby-mode voltage supervisor with minimal quiescent current draw. Use Value: Draws only 0.25 μA at 1 V reverse bias, extending coin-cell battery life beyond 10 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C2V4 | Same 2.4 V nominal Zener, but 300 mW rating on FR-4 and 600 Ω ZZT at 5 mA - lower impedance but higher power envelope | Preferred where higher surge energy absorption is needed, e.g., industrial control I/O protection | Select BZX84-C2V4 if board layout allows larger SOT-23 variant and system requires tighter voltage regulation under variable load |
| MMBZ5221BS | Same electrical specs but in SOD-123 package - 3.7 × 1.6 × 1.1 mm vs. SOT-23's 2.9 × 1.3 × 1.0 mm; no NC pin | Better thermal performance on copper pour, but incompatible with fine-pitch automated placement | Choose MMBZ5221BS when thermal derating margin is critical and pick-and-place equipment supports SOD-123 tape width |
Compared with BZX84-C2V4 and MMBZ5221BS, MMBZ5221BLT1 offers optimal balance of miniaturization, ESD robustness, and automated assembly compatibility - making it preferred for high-volume portable electronics where board area and HBM reliability are primary constraints.
Availability
MMBZ5221BLT1 is available at Aetrix Electronics and suitable for smartphone power management, wearable sensor biasing, USB-C port protection, and industrial IoT node regulation requiring stable component supply and full traceability.
Supply support for MMBZ5221BLT1 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 focused on energy-efficient electronics, delivering silicon-based solutions for automotive, industrial, cloud, and consumer markets.
The MMBZ52xxBLT1G series was designed specifically for compact, high-reliability voltage regulation in portable and space-constrained applications - emphasizing low leakage, high ESD immunity, and SMT process compatibility.
FAQ
What is the Zener voltage tolerance of MMBZ5221BLT1?
The MMBZ5221BLT1 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. This tolerance is guaranteed per onsemi's Electrical Characteristics table and applies directly to MMBZ5221BLT1 - not extrapolated from family data.
Does MMBZ5221BLT1 have a functional third pin?
No, MMBZ5221BLT1 uses Style 8 pinout per onsemi's mechanical outline: Pin 1 is anode, Pin 2 is internally not connected (NC), and Pin 3 is cathode. Pin 2 must remain unconnected on the PCB - it serves no electrical function and is not bonded to the die. This configuration is explicitly confirmed in the datasheet's marking diagram and Electrical Characteristics footnote.
What is the maximum allowable junction temperature for MMBZ5221BLT1?
The MMBZ5221BLT1 has a specified junction and storage temperature range of −65°C to +150°C. This maximum junction temperature of +150°C is defined in the Maximum Ratings table and applies under steady-state thermal conditions with appropriate PCB copper area and airflow. Exceeding this limit risks permanent parametric shift or failure.
How does the ESD rating of MMBZ5221BLT1 impact system-level design?
The MMBZ5221BLT1 carries Class 3 HBM ESD rating (>16 kV), verified per JEDEC JS-001. This eliminates the need for discrete TVS diodes in many consumer portable designs - for example, MMBZ5221BLT1 can directly protect GPIO lines in Bluetooth earbuds without additional protection components, reducing BOM count and board area.
Is MMBZ5221BLT1 compatible with lead-free reflow profiles?
Yes, MMBZ5221BLT1 is Pb-free and RoHS-compliant, with a maximum soldering temperature of 260°C for 10 seconds - fully compatible with standard IPC/JEDEC J-STD-020D lead-free reflow profiles. The thermosetting plastic case and corrosion-resistant finish ensure reliable wetting and joint integrity under peak reflow conditions.
MMBZ5221BLT1 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)
MMBZ5221BLT1 FAQ
1.How can I place an order for MMBZ5221BLT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5221BLT1 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 MMBZ5221BLT1 reliable?
The price and inventory of MMBZ5221BLT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5221BLT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5221BLT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5221BLT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5221BLT1?
MMBZ5221BLT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5221BLT1 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 MMBZ5221BLT1?
For technical support, including MMBZ5221BLT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5221BLT1 requirements.
6.How does Aetrix verify that MMBZ5221BLT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5221BLT1 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 MMBZ5221BLT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5221BLT1?
All MMBZ5221BLT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5221BLT1, 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 MMBZ5221BLT1 part is unused and in its original packaging.
Return procedure for MMBZ5221BLT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5221BLT1 Tags
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