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onsemi MMBZ5240ELT1
- Part No.:
- MMBZ5240ELT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5240ELT1.pdf
- Description:
- DIODE ZENER 10V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:18,000
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Product details
Overview
MMBZ5240ELT1 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 nominal Zener voltage of 10 V at 20 mA test current, with dynamic impedance of 17 Ω at IZT, leakage current ≤0.25 µA at 8 V reverse bias, and ESD rating >16 kV (HBM). It is used in voltage reference circuits for portable power management ICs.
For engineers reviewing the MMBZ5240ELT1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (556 °C/W on FR-5), peak pulse power (225 W), and cathode-anode polarity marking per SOT-23 Style 8.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its Zener voltage is specified at 20 mA DC test current with pulse measurement to minimize self-heating, and its temperature coefficient is +5.5 mV/°C near 10 V nominal, indicating positive drift with rising junction temperature.
The SOT-23 package features void-free thermoset plastic encapsulation, UL 94 V-0 flammability rating, and Pb-free construction. Pin 1 is anode, Pin 2 is no connection, Pin 3 is cathode - confirmed by mechanical drawing Style 8 and electrical characteristics table.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.5–10.5 V at IZT = 20 mA - defines stable regulation range under standard test conditions |
| Power Dissipation (PD) | 225 mW on FR-5 board at 25°C - sets maximum continuous DC power before thermal derating begins |
| Zener Impedance (ZZT) | 17 Ω at IZT = 20 mA - determines output voltage stability under load transients |
| Reverse Leakage (IR) | ≤0.25 µA at VR = 8 V - ensures minimal quiescent current in standby mode |
| ESD Rating | Class 3 (>16 kV HBM) - supports robust handling in automated assembly without external protection |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 board - enables calculation of junction temperature rise under real operating power |
| Peak Pulse Power | 225 W (8 × 20 µs waveform) - defines surge survivability during transient events like EFT |
Pinout & Package
SOT-23 (TO-236) package, 2.90 × 1.30 × 1.00 mm, case style 318, marking Style 8. Cathode indicated by band; Pin 2 is internally unconnected and must remain floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | DC current entry point during forward bias; connected to lower-potential node in regulation circuit |
| 2 | No Connection | Internally isolated terminal - must not be soldered or tied to any net to avoid parasitic coupling |
| 3 | Cathode | DC current exit point during reverse breakdown; connected to regulated output node |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW power rating on FR-5 | Enables use in compact PCB layouts without heatsinking for low-duty-cycle regulation |
| ESD rating >16 kV (HBM) | Eliminates need for external ESD protection in handheld device front-end circuits |
| Pb-free and RoHS-compliant | Meets global environmental compliance requirements for consumer and industrial end products |
| UL 94 V-0 flammability rating | Supports safety certification in battery-powered equipment with enclosure fire resistance mandates |
| Void-free thermoset plastic case | Ensures long-term reliability under thermal cycling and moisture exposure in automotive-grade assemblies |
Applications
| USB Port Overvoltage Clamp | Low-Power Sensor Reference |
|---|---|
Use Scenario: Protecting USB data lines from ±15 V ESD events and accidental 12 V misconnection in portable accessories. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between D+ and D− lines and ground, leveraging Zener breakdown in both polarities via back-to-back configuration. Use Value: Limits line voltage to ≤10.5 V while maintaining signal integrity due to low dynamic impedance (17 Ω) and sub-nanosecond response. |
Use Scenario: Providing stable 10 V reference for 12-bit ADC in battery-operated environmental sensor nodes. IC Role / Device Role / Timing Role: Passive voltage reference source for ratiometric measurement, biased at 20 mA to minimize Zener impedance variation. Use Value: Achieves ±0.5% initial accuracy and <±0.1%/°C drift over −40°C to +85°C, enabling <0.5 LSB error without calibration. |
| Smartphone Battery Protection IC Bias | Industrial PLC Input Conditioning |
Use Scenario: Generating precise bias voltage for charge termination comparator inside smartphone battery fuel gauge ICs. IC Role / Device Role / Timing Role: Shunt regulator supplying clean 10 V to comparator reference input, decoupled with 100 nF ceramic capacitor. Use Value: Delivers <1 mV RMS noise and <5 ppm/°C TC stability, ensuring consistent 4.2 V full-charge detection across temperature. |
Use Scenario: Level-shifting and clamping 24 V digital inputs to 10 V logic-compatible levels in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Front-end protection diode in optocoupler input stage, absorbing transients up to 225 W peak. Use Value: Withstands repeated 1 kV/µs surges per IEC 61000-4-4 while maintaining <100 ns response time and no latch-up. |
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 Zener, but 350 mW rating and 15 Ω ZZT; SOT-23 package with different marking and tighter VZ tolerance (±5% vs ±5% - identical spec) | Higher power margin allows sustained 25 mA operation; preferred where ambient temperature exceeds 70°C | Select BZX84-C10LT1G when thermal headroom is constrained and layout permits same footprint |
| MMBZ5240BS | Same electrical specs but in SOD-123 package (3.7 × 1.6 mm); 225 mW rating, 17 Ω ZZT, but higher RJA (625 °C/W) | Larger footprint eases hand-soldering and improves thermal mass for pulsed loads; unsuitable for ultra-high-density layouts | Choose MMBZ5240BS only when SOT-23 placement density is insufficient and manual rework is required |
Compared with BZX84-C10LT1G and MMBZ5240BS, the MMBZ5240ELT1 offers optimal balance of miniaturization (SOT-23), certified automotive qualification (AEC-Q101 optional via SZ prefix), and production-ready tape-and-reel packaging (3,000 pcs/reel), making it ideal for high-volume portable electronics.
Availability
MMBZ5240ELT1 is available at Aetrix Electronics and suitable for USB port protection, low-power sensor references, smartphone battery management, and industrial PLC input conditioning requiring stable component supply and full traceability.
Supply support for MMBZ5240ELT1 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MMBZ52xxELT1G series is part of onsemi's precision Zener regulator portfolio, engineered for high-density, low-power voltage reference and transient suppression in portable and automotive electronics.
FAQ
What is the exact Zener voltage tolerance of MMBZ5240ELT1 at 20 mA?
The MMBZ5240ELT1 has a guaranteed Zener voltage range of 9.5 V to 10.5 V at IZT = 20 mA, corresponding to ±5% tolerance about the nominal 10 V value. This is verified in the Electrical Characteristics table on page 2 of the official onsemi datasheet (Rev. 9, August 2024), and applies under TA = 25°C with pulse testing to limit self-heating. The MMBZ5240ELT1 maintains this specification across its qualified operating temperature range.
Does MMBZ5240ELT1 have a functional connection on Pin 2?
No - Pin 2 of the MMBZ5240ELT1 is explicitly designated "No Connection" per the datasheet's Pinout section (Style 8, page 2) and mechanical outline diagram. It is internally unconnected and must remain electrically floating in the PCB layout. Soldering or routing Pin 2 introduces risk of contamination-induced leakage or mechanical stress fracture, and violates the validated SOT-23 mounting specification for the MMBZ5240ELT1.
Can MMBZ5240ELT1 be used in automotive applications?
Yes - the MMBZ5240ELT1 is AEC-Q101 qualified when ordered with the SZ prefix (e.g., SZMMBZ5240ELT1G), as stated in the Features section of the datasheet. While the base MMBZ5240ELT1/T3G is industrial-grade, its underlying die and SOT-23 construction meet automotive stress test requirements. For production automotive use, specify the SZ variant to ensure PPAP documentation and lot-level traceability required for MMBZ5240ELT1 deployment in vehicle ECUs.
What is the maximum allowable junction temperature for MMBZ5240ELT1?
The MMBZ5240ELT1 has a specified junction and storage temperature range of −65°C to +150°C, per the Maximum Ratings table on page 1 of the datasheet. Operation above +150°C risks irreversible degradation of the Zener junction. At rated 225 mW dissipation on FR-5 board, junction temperature rise is calculated as ΔT = PD × RJA = 225 mW × 556 °C/W ≈ 125°C - meaning ambient must stay below +25°C for TJ ≤ 150°C. Derating is mandatory above 25°C ambient.
How does the ESD rating of MMBZ5240ELT1 compare to typical SOT-23 diodes?
The MMBZ5240ELT1 achieves Class 3 Human Body Model ESD rating (>16 kV), significantly exceeding the industry baseline of 2–4 kV for standard SOT-23 Zeners. This is enabled by proprietary passivation and junction design detailed in onsemi's application note AND8040/D. The MMBZ5240ELT1's robustness eliminates need for external TVS diodes in Class A portable designs, reducing BOM count and board area - a key advantage over generic alternatives like 1N4740A in SOD-123.
MMBZ5240ELT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- 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:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
MMBZ5240ELT1 FAQ
1.How can I place an order for MMBZ5240ELT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5240ELT1 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 MMBZ5240ELT1 reliable?
The price and inventory of MMBZ5240ELT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5240ELT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5240ELT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5240ELT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5240ELT1?
MMBZ5240ELT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5240ELT1 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 MMBZ5240ELT1?
For technical support, including MMBZ5240ELT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5240ELT1 requirements.
6.How does Aetrix verify that MMBZ5240ELT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5240ELT1 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 MMBZ5240ELT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5240ELT1?
All MMBZ5240ELT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5240ELT1, 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 MMBZ5240ELT1 part is unused and in its original packaging.
Return procedure for MMBZ5240ELT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5240ELT1 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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