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onsemi MMBZ5235ELT1
- Part No.:
- MMBZ5235ELT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5235ELT1.pdf
- Description:
- DIODE ZENER 6.8V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,267
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Product details
Overview
MMBZ5235ELT1 from onsemi is a 6.8 V ±5% Zener voltage regulator diode in SOT-23 package, rated for 225 mW power dissipation at 25°C, with 5 Ω dynamic impedance at 20 mA test current and 3 μA leakage current at 5 V reverse bias - used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the MMBZ5235ELT1 datasheet, pinout, applications, or equivalent options, this device is selected for low-power voltage clamping, ESD-tolerant biasing, and space-constrained regulation where tight Zener tolerance, high ESD immunity (>16 kV HBM), and thermal stability across −65°C to +150°C are required.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 6.8 V at 20 mA test current (IZT), exhibiting a temperature coefficient near 0 mV/°C in its mid-voltage range and maintaining stable regulation under transient pulse loads up to 225 W (8 × 20 µs). Its SOT-23 package supports automated placement and delivers 556°C/W junction-to-ambient thermal resistance on FR-5 board.
The device features a cathode-anode configuration with Pin 1 = Anode, Pin 2 = No Connection, Pin 3 = Cathode; it is Pb-free, AEC-Q101 qualified (SZ-prefix variant), and rated for Class 3 ESD robustness (>16 kV HBM), making it suitable for automotive and industrial environments requiring reliable voltage clamping without external bias circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.46–7.14 V at IZT = 20 mA - ensures ±5% regulation accuracy for 6.8 V nominal rail stabilization |
| Power Dissipation (PD) | 225 mW on FR-5 board at 25°C - supports continuous low-power clamping in handheld PCBs |
| Zener Impedance (ZZT) | 5 Ω max at IZT = 20 mA - provides low AC impedance for stable reference under varying load |
| Leakage Current (IR) | 3 μA max at VR = 5 V - minimizes standby current loss in battery-powered systems |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - enables direct integration into ESD-sensitive signal/power paths |
| Junction Temp Range | −65°C to +150°C - allows operation in extended-temperature automotive and industrial control modules |
Pinout & Package
SOT-23 (TO-236) surface-mount package: 2.90 mm × 1.30 mm × 1.00 mm body, void-free thermosetting plastic case, corrosion-resistant finish, UL 94 V-0 flammability rating, marked with cathode band and device code "BF7".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential node during Zener operation; reverse-biased with respect to cathode |
| Pin 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| Pin 3 | Cathode | Connected to regulated voltage node; polarity band on package identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating | Enables sustained voltage clamping in compact portable designs without thermal derating at room temperature |
| 5 Ω Dynamic Impedance | Delivers tight output voltage stability under dynamic load transients in feedback-sensing circuits |
| Class 3 ESD Robustness | Eliminates need for external TVS diodes in I/O line protection for consumer and automotive ECUs |
| Pb-Free & RoHS Compliant | Meets global environmental compliance requirements for industrial and medical end equipment |
| AEC-Q101 Qualified Variant | Validated for automotive applications via SZMMBZ5235ELT1G - same electrical specs with enhanced process controls |
Applications
| USB Port Overvoltage Protection | Smartphone Battery Monitoring Reference |
|---|---|
|
Use Scenario: Clamps transient surges on USB VBUS lines during hot-plug or ESD events. IC Role / Device Role / Timing Role: Zener clamp placed between VBUS and ground to limit voltage excursion to ≤7.14 V. Use Value: Prevents damage to USB controller ICs by limiting peak voltage within absolute maximum ratings using only 225 mW dissipation. |
Use Scenario: Provides stable 6.8 V reference for ADC input scaling in battery fuel gauges. IC Role / Device Role / Timing Role: Precision shunt reference connected to microcontroller ADC reference divider network. Use Value: Achieves <±1% effective reference accuracy over temperature due to low ZZT and near-zero TC at 6.8 V. |
| IoT Sensor Node Bias Rail | Automotive Cabin Controller Reset Circuit |
|
Use Scenario: Generates clean 6.8 V bias for op-amp signal conditioning stages in ultra-low-power sensors. IC Role / Device Role / Timing Role: Shunt regulator supplying constant voltage to analog front-end while drawing <3 μA leakage at idle. Use Value: Extends coin-cell battery life by minimizing quiescent current while maintaining regulation accuracy across −40°C to +85°C. |
Use Scenario: Sets threshold for reset supervisor IC monitoring 12 V system rail in infotainment modules. IC Role / Device Role / Timing Role: Zener-based voltage divider feeding reset comparator input to trigger MCU reset below 10.5 V. Use Value: Enables reliable cold-cranking detection down to −40°C using AEC-Q101-qualified variant SZMMBZ5235ELT1G. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C6V8LT1G | Same 6.8 V nominal, but 300 mW PD rating and 10 Ω ZZT - higher power margin, looser impedance control | Preferred where higher surge energy handling is needed, but less suitable for precision reference use | Select when board layout allows larger thermal relief or when tighter ZZT is not critical |
| MMBZ5235BS | Same electrical specs, but in SOD-323 package - 1.7 mm × 1.25 mm footprint vs. SOT-23's 2.9 mm × 1.3 mm | Better suited for ultra-high-density layouts where component height and area are constrained | Choose when PCB real estate is prioritized over pick-and-place compatibility with standard SOT-23 feeders |
Compared with BZX84-C6V8LT1G and MMBZ5235BS, the MMBZ5235ELT1 offers optimal balance of low dynamic impedance (5 Ω), industry-standard SOT-23 assembly compatibility, and proven reliability in portable and automotive applications - making it preferred for precision-clamp and reference roles where both accuracy and manufacturability matter.
Availability
MMBZ5235ELT1 is available at Aetrix Electronics and suitable for USB power protection, smartphone battery monitoring, IoT sensor biasing, and automotive reset supervision requiring stable component supply and full traceability.
Supply support for MMBZ5235ELT1 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 semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZ52xxELT1G series was designed specifically for space-constrained, low-power voltage regulation and ESD protection - targeting cellular phones, handheld portables, and high-density PC boards where miniaturization and reliability are critical.
FAQ
What is the Zener voltage tolerance of MMBZ5235ELT1?
The MMBZ5235ELT1 has a Zener voltage range of 6.46 V to 7.14 V at 20 mA test current, corresponding to a ±5% tolerance around the nominal 6.8 V rating. This tolerance is guaranteed across the full operating temperature range and is verified per onsemi's production testing protocol - ensuring consistent performance in MMBZ5235ELT1-based voltage references and clamps.
Does MMBZ5235ELT1 have a built-in ESD protection rating?
Yes, the MMBZ5235ELT1 is rated for Class 3 ESD robustness (>16 kV) per the Human Body Model (HBM), as confirmed in the official onsemi datasheet. This makes the MMBZ5235ELT1 suitable for direct placement on I/O lines and power inputs in consumer and automotive electronics without requiring additional discrete ESD protection components.
What is the thermal resistance of MMBZ5235ELT1 on FR-5 board?
The MMBZ5235ELT1 exhibits a junction-to-ambient thermal resistance (RJA) of 556°C/W when mounted on an FR-5 board per the datasheet's test conditions. This value defines the temperature rise per unit power dissipated and is essential for calculating safe operating limits - for example, at 225 mW, junction temperature rises ~125°C above ambient, confirming suitability for ambient temperatures up to +25°C in sealed enclosures.
Is Pin 2 of MMBZ5235ELT1 electrically connected?
No, Pin 2 of the MMBZ5235ELT1 is internally not connected (NC) - it serves only as a mechanical support in the SOT-23 package and must remain unconnected on the PCB. The active terminals are Pin 1 (Anode) and Pin 3 (Cathode), with polarity indicated by the cathode band adjacent to Pin 3. This NC pin configuration is explicitly defined in the Electrical Characteristics table and mechanical drawings for MMBZ5235ELT1.
Can MMBZ5235ELT1 be used in automotive applications?
Yes - while the standard MMBZ5235ELT1 is industrial-grade, its automotive-qualified counterpart SZMMBZ5235ELT1G shares identical electrical specifications and is AEC-Q101 qualified and PPAP capable. For automotive designs requiring qualification evidence, the SZMMBZ5235ELT1G variant should be specified; however, the MMBZ5235ELT1 remains functionally compatible in non-certified prototype or cost-sensitive modules where full AEC compliance is not mandated.
MMBZ5235ELT1 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):
- 6.8 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 5 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)
MMBZ5235ELT1 FAQ
1.How can I place an order for MMBZ5235ELT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5235ELT1 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 MMBZ5235ELT1 reliable?
The price and inventory of MMBZ5235ELT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5235ELT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5235ELT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5235ELT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5235ELT1?
MMBZ5235ELT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5235ELT1 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 MMBZ5235ELT1?
For technical support, including MMBZ5235ELT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5235ELT1 requirements.
6.How does Aetrix verify that MMBZ5235ELT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5235ELT1 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 MMBZ5235ELT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5235ELT1?
All MMBZ5235ELT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5235ELT1, 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 MMBZ5235ELT1 part is unused and in its original packaging.
Return procedure for MMBZ5235ELT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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