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onsemi MMBZ5240BLT3G
- Part No.:
- MMBZ5240BLT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5240BLT3G.pdf
- Description:
- DIODE ZENER 10V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,241
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Product details
Overview
MMBZ5240BLT3G 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 ±5% Zener voltage tolerance at 20 mA test current, 600 Ω dynamic impedance, and supports ≤8 V reverse leakage at 8 V bias - used in power rail clamping for portable battery-powered systems.
For engineers reviewing the MMBZ5240BLT3G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, thermal resistance (556 °C/W on FR-5), ESD robustness (>16 kV HBM), and compatibility with high-density automated assembly processes.
Technical Context
This device operates as a two-terminal voltage reference diode with cathode-anode polarity, requiring no external biasing. Its Zener breakdown mechanism provides stable reverse conduction above 9.5 V (min) and below 10.5 V (max) at IZT = 20 mA, with temperature coefficient near 0 mV/°C for nominal 10 V operation.
It features a non-connected terminal (Pin 2), enabling simplified PCB layout and eliminating floating node concerns. Thermal performance is specified for both FR-5 (225 mW) and alumina substrates (300 mW), supporting design flexibility across consumer and industrial board materials.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.5–10.5 V at IZT = 20 mA - defines clamping threshold for 3.3 V/5 V rail protection |
| Power Dissipation | 225 mW on FR-5 board - sets maximum continuous clamp energy without derating |
| Zener Impedance (ZZT) | 600 Ω at IZT = 20 mA - determines voltage deviation under load transients |
| Reverse Leakage (IR) | 3 µA max at VR = 8 V - ensures minimal quiescent current in standby mode |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct integration into handheld ESD-prone interfaces |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 - informs junction temperature rise under sustained dissipation |
| Operating Temperature | −65 to +150 °C - supports automotive cabin and industrial ambient environments |
Pinout & Package
SOT-23 (TO-236) package: 2.90 × 1.30 × 1.00 mm body, 1.90 mm lead pitch, Pb-free, RoHS-compliant, cathode marked by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node (e.g., GND or regulated rail return) |
| 2 | No Connection | Internally unconnected - must remain floating; no PCB trace or pad required |
| 3 | Cathode | Connected to protected node (e.g., IC supply pin); conducts when voltage exceeds VZ |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW FR-5 power rating | Enables compact overvoltage protection without heatsinking in thin-profile PCBs |
| ESD robustness >16 kV HBM | Eliminates need for external ESD suppressors in USB, button, and sensor interface paths |
| Small SOT-23 footprint | Reduces board area by >60% vs. DO-35, critical for smartphones and wearables |
| Pb-free, Halogen-free, RoHS | Meets global environmental compliance without derating or process change |
| −65 to +150 °C operating range | Supports under-hood automotive modules and industrial motor control enclosures |
Applications
| USB Port Protection | Microcontroller I/O Clamp |
|---|---|
Use Scenario: Clamping transient surges on USB D+/D− lines during hot-plug or ESD events. IC Role / Device Role / Timing Role: Two-terminal shunt regulator placed between signal line and ground. Use Value: Limits voltage excursion to ≤10.5 V, preventing damage to 3.3 V USB transceivers while adding <1 pF capacitance. |
Use Scenario: Protecting GPIO pins of ARM Cortex-M microcontrollers against overvoltage from external sensors. IC Role / Device Role / Timing Role: Passive voltage clamp connected anode-to-GND, cathode-to-pin. Use Value: Absorbs up to 225 mW surge energy without latch-up, maintaining logic-level integrity during 8 kV contact discharge. |
| Battery Management Reference | Portable Audio Power Rail Clamp |
Use Scenario: Providing stable 10 V reference for ADC calibration in Li-ion fuel gauges. IC Role / Device Role / Timing Role: Zener-based voltage reference in low-current divider network. Use Value: Delivers ±5% initial accuracy and <0.5 mV/°C TC drift, enabling <0.1% SOC estimation error. |
Use Scenario: Suppressing switching noise spikes on 5 V audio codec supply rails in Bluetooth earbuds. IC Role / Device Role / Timing Role: Shunt clamp parallel to LDO output capacitor. Use Value: Reduces peak rail overshoot from 6.2 V to 10.5 V with <100 ns response, preserving SNR in DAC output stage. |
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 15 Ω ZZT; SOT-23 package with Pin 2 connected to cathode | Higher power handling suits 12 V automotive loads; lower impedance improves regulation under varying current | Select when tighter voltage regulation under dynamic load or higher surge energy is required |
| MMBZ5240BS | Same electrical specs, but in SOD-123 package (3.7 × 2.7 × 1.2 mm); no NC pin - only two terminals | Larger footprint eases hand-soldering and thermal relief; lacks Pin 2 isolation for ultra-dense layouts | Select when manual rework, thermal margin, or legacy footprint compatibility is prioritized over miniaturization |
Compared with MMBZ5240BLT3G, BZX84-C10LT1G offers superior regulation stability but requires layout review due to different pin configuration, while MMBZ5240BS trades space efficiency for mechanical robustness and simplified routing - all three maintain identical 10 V clamping function.
Availability
MMBZ5240BLT3G is available at Aetrix Electronics and suitable for USB interface protection, microcontroller I/O clamping, and portable audio power rail stabilization requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for MMBZ5240BLT3G 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 manufacturer specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications.
The MMBZ52xxBLT3G series belongs to onsemi's precision Zener voltage regulator product line, engineered specifically for space-constrained, high-reliability voltage clamping and reference functions in portable and automotive electronics.
FAQ
What is the Zener voltage tolerance of MMBZ5240BLT3G at 20 mA test current?
The MMBZ5240BLT3G has a Zener voltage range of 9.5 V (minimum) to 10.5 V (maximum) at IZT = 20 mA, corresponding to ±5% tolerance around the nominal 10 V rating. This tolerance is guaranteed across the full operating temperature range of −65 °C to +150 °C and is verified per onsemi's production test flow. The MMBZ5240BLT3G datasheet specifies this parameter in the Electrical Characteristics table on page 3.
Does MMBZ5240BLT3G have a functional third pin, and how should Pin 2 be handled in PCB layout?
No, Pin 2 of the MMBZ5240BLT3G is internally not connected (NC) and must remain electrically floating - it must not be tied to ground, VCC, or any other net. The official onsemi mechanical drawing (CASE 318, STYLE 8) confirms Pin 2 as NC. In PCB layout, omit the copper pad or trace for Pin 2 to prevent unintended coupling or solder bridging; only Pins 1 (anode) and 3 (cathode) require routing.
What is the maximum reverse leakage current for MMBZ5240BLT3G, and at what voltage is it specified?
The MMBZ5240BLT3G exhibits a maximum reverse leakage current (IR) of 3 µA at VR = 8 V, as confirmed in the Electrical Characteristics table on page 3 of the datasheet. This value is measured at TA = 25 °C and ensures minimal standby power loss in always-on circuits such as battery-backed real-time clocks or sensor wake-up monitors using the MMBZ5240BLT3G as a reference element.
Can MMBZ5240BLT3G be used in automotive applications, and what qualification does it hold?
The standard MMBZ5240BLT3G is not AEC-Q101 qualified; however, its automotive-grade counterpart SZMMBZ5240BLT3G is fully AEC-Q101 qualified and PPAP capable. Both share identical electrical specs and SOT-23 packaging, but only the SZ-prefix version meets automotive reliability requirements including extended temperature cycling, HTOL, and ESD testing. For automotive use, specify SZMMBZ5240BLT3G - the MMBZ5240BLT3G is intended for commercial and industrial applications.
How does the thermal resistance of MMBZ5240BLT3G impact its power handling on standard FR-4 PCBs?
The MMBZ5240BLT3G has a junction-to-ambient thermal resistance (RJA) of 556 °C/W on FR-5 board - FR-4 performance is comparable. At 25 °C ambient, this limits continuous power dissipation to 225 mW before exceeding the 150 °C max junction temperature. For example, dissipating 150 mW raises junction temperature by ~84 °C, reaching 109 °C - well within spec. Derating is required above 25 °C at 1.8 mW/°C, as defined in the Maximum Ratings table.
MMBZ5240BLT3G 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)
MMBZ5240BLT3G FAQ
1.How can I place an order for MMBZ5240BLT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5240BLT3G 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 MMBZ5240BLT3G reliable?
The price and inventory of MMBZ5240BLT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5240BLT3G is usually 5 days.
3.What payment methods are accepted for MMBZ5240BLT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5240BLT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5240BLT3G?
MMBZ5240BLT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5240BLT3G 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 MMBZ5240BLT3G?
For technical support, including MMBZ5240BLT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5240BLT3G requirements.
6.How does Aetrix verify that MMBZ5240BLT3G is sourced from the original manufacturer or authorized distributors?
All MMBZ5240BLT3G 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 MMBZ5240BLT3G meets industry standards.
7.What is the process for return or replacement of MMBZ5240BLT3G?
All MMBZ5240BLT3G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5240BLT3G, 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 MMBZ5240BLT3G part is unused and in its original packaging.
Return procedure for MMBZ5240BLT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5240BLT3G Tags
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