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onsemi MMBZ5240BLT3
- Part No.:
- MMBZ5240BLT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5240BLT3.pdf
- Description:
- DIODE ZENER 10V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,241
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Product details
Overview
MMBZ5240BLT3 from onsemi is a 10 V, 225 mW surface-mount Zener diode in SOT-23 package, designed for precision voltage regulation and overvoltage protection in space-constrained circuits. It delivers 10.0 V nominal Zener voltage at 20 mA test current, with ±5% tolerance (9.5–10.5 V), 17 Ω dynamic impedance, and 3 µA leakage current at 8 V reverse bias - deployed in portable power rails and I/O line clamping.
For engineers reviewing the MMBZ5240BLT3 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, low dynamic impedance for stable regulation, ESD robustness (>16 kV HBM), thermal performance on FR-5 board, and compatibility with automated SMT assembly.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining a stable reverse-biased breakdown voltage across its cathode-anode terminals. Its 17 Ω Zener impedance at 20 mA ensures minimal voltage deviation under load transients, while the 3 µA leakage at 8 V enables low-power standby operation.
The SOT-23 package supports high-density PCB layouts and withstands 260°C for 10 seconds during reflow soldering. With a −65°C to +150°C junction temperature range and AEC-Q101 qualification available in SZ-prefix variants, it meets industrial and automotive-grade reliability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 10.0 V nominal (9.5–10.5 V range) at 20 mA - defines precise clamping level for 3.3 V/5 V rail protection. |
| Power Dissipation | 225 mW on FR-5 board - sets maximum continuous regulation power without heatsinking. |
| Zener Impedance (ZZT) | 17 Ω at IZT = 20 mA - ensures <170 mV output shift per 1 mA load change, critical for stable reference. |
| Leakage Current (IR) | 3 µA max at VR = 8 V - enables low-quiescent-current operation in battery-powered systems. |
| ESD Rating | Class 3 (>16 kV HBM) - provides intrinsic I/O line robustness without external TVS in many consumer designs. |
| Junction Temp Range | −65°C to +150°C - supports operation in extended-temperature industrial and under-hood automotive 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 identified by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Anode | Forward conduction terminal / Zener cathode reference | Connected to lower-potential node (e.g., GND or regulated rail return); reverse bias applied between Pin 3 and Pin 1. |
| 2 - No Connection | Internal isolation | Electrically unconnected; no PCB trace or pad required - simplifies layout and avoids floating node risks. |
| 3 - Cathode | Zener breakdown terminal | Connected to higher-potential node (e.g., input rail or signal line); establishes regulated voltage drop relative to anode. |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW power rating on FR-5 board | Enables compact, self-contained regulation without external heat sinking in handheld PCBs. |
| ESD robustness >16 kV HBM | Reduces need for discrete ESD protection on low-speed I/O lines in consumer portables. |
| Pb-free, halogen-free, RoHS-compliant | Meets global environmental compliance mandates without derating or process changes. |
| Optimized for automated SMT assembly | Standard SOT-23 footprint and marking support high-yield pick-and-place and AOI inspection. |
Applications
| USB Port Protection | Microcontroller I/O Clamping |
|---|---|
Use Scenario: Protecting USB 2.0 D+ and D− lines from ESD and transient overvoltage during hot-plug events. IC Role / Device Role / Timing Role: Shunt clamping device limiting line voltage to 10 V during surges, preserving PHY integrity. Use Value: Leverages 17 Ω ZZT and 3 µA leakage to clamp transients without loading idle bus states or distorting signal edges. |
Use Scenario: Safeguarding 3.3 V GPIO pins of ARM Cortex-M microcontrollers against accidental 5 V misconnection or inductive kick. IC Role / Device Role / Timing Role: Bidirectional voltage limiter referenced to MCU VSS, absorbing positive excursions above 10 V. Use Value: Uses 225 mW rating and −65°C to +150°C range to survive repeated fault events in industrial control panels. |
| Portable Battery Monitoring | Low-Power Sensor Reference |
Use Scenario: Stabilizing ADC reference input for lithium-ion cell voltage sensing in wearables with tight space constraints. IC Role / Device Role / Timing Role: Precision Zener providing 10 V reference derived from higher-voltage battery pack, buffered into ADC input. Use Value: Achieves ±5% voltage accuracy and 17 Ω impedance to minimize reference drift under varying load and temperature. |
Use Scenario: Generating stable bias voltage for analog front-end op-amps in battery-operated environmental sensors. IC Role / Device Role / Timing Role: Low-leakage (3 µA @ 8 V) shunt regulator supplying clean 10 V to sensor signal conditioning circuitry. Use Value: Enables multi-year battery life by drawing sub-microamp quiescent current while maintaining regulation stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C10LT1G | Same 10 V nominal, but 350 mW rating and 20 Ω ZZT; SOT-23 package with identical pinout (Pin 1-Anode, Pin 2-NC, Pin 3-Cathode). | Higher power handling suits higher-current regulation; slightly higher impedance affects transient response. | Select when >225 mW dissipation is needed; verify thermal margin on FR-5 board. |
| MMBZ5240BS | Same electrical specs, but in SOD-123 package (larger footprint, higher 350 mW rating on FR-4); not SMT-optimized for ultra-dense layouts. | Preferred where manual rework or higher reliability under mechanical stress is prioritized over miniaturization. | Choose for prototyping or low-volume industrial assemblies where SOT-23 placement yield is challenging. |
Compared with BZX84-C10LT1G and MMBZ5240BS, the MMBZ5240BLT3 offers optimal balance of miniaturization (SOT-23), 225 mW regulation capability, and 17 Ω impedance - making it ideal for production-scale portable electronics where board area and automated assembly are critical.
Availability
MMBZ5240BLT3 is available at Aetrix Electronics and suitable for USB interface protection, microcontroller I/O clamping, portable battery monitoring, and low-power sensor reference applications requiring stable component supply and full RoHS compliance.
Supply support for MMBZ5240BLT3 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 (Semiconductor Components Industries, LLC) is a global supplier of energy-efficient semiconductor solutions, specializing in power management, analog, sensing, and connectivity technologies for automotive, industrial, and cloud power markets.
The MMBZ52xxBLT3 series is part of onsemi's precision Zener regulator portfolio, engineered for space-constrained, high-reliability voltage reference and overvoltage protection in portable and embedded systems.
FAQ
What is the Zener voltage tolerance of the MMBZ5240BLT3?
The MMBZ5240BLT3 has a nominal Zener voltage of 10.0 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 9.5 V and 10.5 V when tested at 20 mA (IZT). This tolerance is confirmed in the Electrical Characteristics table of the official onsemi datasheet (Rev. 16, July 2024), and applies strictly under the specified test conditions of TA = 25°C.
Does the MMBZ5240BLT3 have a connection on pin 2?
No, pin 2 of the MMBZ5240BLT3 is internally not connected (NC). The device uses only pins 1 (anode) and 3 (cathode) for operation. This is explicitly defined in the marking diagram and mechanical outline (Style 8) in the onsemi datasheet, and must be reflected in PCB layout to avoid unintended shorts or floating traces.
What is the maximum power dissipation of the MMBZ5240BLT3 on a standard FR-5 board?
The MMBZ5240BLT3 is rated for 225 mW total power dissipation on an FR-5 board at 25°C ambient temperature, with a derating factor of 1.8 mW/°C above that temperature. This value is specified in the Maximum Ratings table and validated for typical JEDEC-standard board construction (1.0 × 0.75 × 0.62 inches).
Is the MMBZ5240BLT3 suitable for automotive applications?
The base MMBZ5240BLT3 is not AEC-Q101 qualified; however, the functionally identical SZMMBZ5240BLT3 variant is automotive-grade, fully AEC-Q101 qualified and PPAP capable. For automotive use, designers must specify the SZ-prefix part - the MMBZ5240BLT3 itself is intended for industrial and consumer applications.
What is the Zener impedance of the MMBZ5240BLT3 and why does it matter?
The MMBZ5240BLT3 has a maximum Zener impedance (ZZT) of 17 Ω at IZT = 20 mA. This low impedance ensures minimal voltage variation under changing load currents - for example, a 1 mA change in Zener current causes only ~17 mV shift in regulated voltage. This stability is essential for precision reference and clamping functions in sensitive analog and digital circuits.
MMBZ5240BLT3 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):
- 10 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 8 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
MMBZ5240BLT3 FAQ
1.How can I place an order for MMBZ5240BLT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5240BLT3 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 MMBZ5240BLT3 reliable?
The price and inventory of MMBZ5240BLT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5240BLT3 is usually 5 days.
3.What payment methods are accepted for MMBZ5240BLT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5240BLT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5240BLT3?
MMBZ5240BLT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5240BLT3 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 MMBZ5240BLT3?
For technical support, including MMBZ5240BLT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5240BLT3 requirements.
6.How does Aetrix verify that MMBZ5240BLT3 is sourced from the original manufacturer or authorized distributors?
All MMBZ5240BLT3 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 MMBZ5240BLT3 meets industry standards.
7.What is the process for return or replacement of MMBZ5240BLT3?
All MMBZ5240BLT3 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5240BLT3, 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 MMBZ5240BLT3 part is unused and in its original packaging.
Return procedure for MMBZ5240BLT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5240BLT3 Tags
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