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onsemi MMBZ5235BLT1
- Part No.:
- MMBZ5235BLT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5235BLT1.pdf
- Description:
- DIODE ZENER 6.8V 225MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:7,607
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Product details
Overview
MMBZ5235BLT1 from onsemi is a 225 mW surface-mount Zener diode in SOT-23 package, rated for 6.8 V nominal Zener voltage at 20 mA test current, with 5 Ω dynamic impedance and 3 μA leakage current at 5 V reverse bias. It provides precision voltage regulation in space-constrained applications such as portable power rails and voltage reference circuits.
For engineers reviewing the MMBZ5235BLT1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (556 °C/W on FR-5), ESD rating (>16 kV HBM), cathode-anode polarity marking, and compatibility with automated SMT assembly.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp voltage at its specified Zener level. Its 6.8 V nominal regulation point falls within the low-to-mid range of the MMBZ52xxBLT1G series, exhibiting a positive temperature coefficient near zero crossing - typical for Zeners in this voltage band.
The SOT-23 package features Pin 1 (Anode), Pin 2 (No Connection), and Pin 3 (Cathode), with cathode polarity indicated by a band. Thermal performance is defined for FR-5 board (225 mW) and alumina substrate (300 mW), supporting design flexibility across PCB material classes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.8 V nominal at IZT = 20 mA - defines stable regulation point for low-power reference circuits |
| Zener Impedance (ZZT) | 5 Ω max at IZT = 20 mA - ensures minimal output voltage variation under load changes |
| Power Dissipation | 225 mW on FR-5 board - sets maximum continuous power handling in standard PCB environments |
| Leakage Current (IR) | 3 μA max at VR = 5 V - guarantees low standby current in battery-powered systems |
| ESD Rating | Class 3 (>16 kV HBM) - enables robust handling during automated assembly and end-use in portable electronics |
| Operating Temperature | −65 °C to +150 °C - supports deployment in automotive under-hood and industrial control 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 polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Forward-biased terminal; connects to lower-potential node in regulation path |
| Pin 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| Pin 3 | Cathode | Reverse-biased terminal; connects to regulated output node or voltage reference point |
Key Features
| Feature | Design Value |
|---|---|
| Pb-Free, Halogen-Free/BFR-Free | RoHS-compliant construction enabling global market access and environmental compliance |
| Small SOT-23 footprint | Enables high-density placement on compact PCBs used in smartphones and wearables |
| Optimized for automated assembly | Package geometry and finish support reliable pick-and-place and reflow soldering |
| Low leakage at sub-Zener bias | 3 μA @ 5 V allows use in ultra-low-power monitoring and wake-up circuits |
Applications
| Portable Power Rail Clamping | Microcontroller Voltage Reference |
|---|---|
Use Scenario: Protecting 3.3 V or 5 V logic rails from transient overvoltage in handheld devices. IC Role / Device Role / Timing Role: Zener clamping element placed between rail and ground to shunt excess energy. Use Value: 6.8 V Zener voltage provides headroom above 5 V rail while limiting peak excursion to safe levels. |
Use Scenario: Providing stable reference voltage for ADC input scaling or brown-out detection in embedded microcontrollers. IC Role / Device Role / Timing Role: Passive voltage reference source connected to MCU analog reference pin or reset comparator input. Use Value: Tight 6.8 V ±5% tolerance and low 5 Ω impedance ensure repeatable threshold setting across temperature. |
| USB Interface ESD Protection | Industrial Sensor Signal Conditioning |
Use Scenario: Supplementing TVS diodes on USB data lines to absorb low-energy transients before IC-level protection. IC Role / Device Role / Timing Role: Low-capacitance (<10 pF) Zener acting as secondary clamp adjacent to high-speed signal traces. Use Value: >16 kV HBM ESD rating adds system-level robustness without degrading signal integrity. |
Use Scenario: Biasing and stabilizing bridge sensor outputs in 4–20 mA loop transmitters or RTD interfaces. IC Role / Device Role / Timing Role: Precision Zener supplying excitation voltage or reference for op-amp gain-setting networks. Use Value: −65 °C to +150 °C operating range ensures reliability in uncontrolled industrial enclosures. |
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-C6V8 | Same 6.8 V nominal Zener, but 300 mW rating and higher ZZT (10 Ω) | Higher power dissipation suits higher-current regulation; less precise regulation due to higher impedance | Select when board layout allows larger SOT-23 variant and tighter impedance is not critical |
| MMBZ5235BS | Same electrical specs, but in SOD-323 package (1.7 × 1.25 mm) - smaller footprint, lower thermal mass | Better suited for ultra-dense layouts; reduced power derating above 25°C due to smaller thermal interface | Select when PCB area is constrained beyond SOT-23 limits and thermal load remains low |
Compared with BZX84-C6V8 and MMBZ5235BS, the MMBZ5235BLT1 offers optimal balance of precision (5 Ω ZZT), manufacturability (SOT-23), and thermal capability (225 mW on FR-5), making it ideal for mid-volume consumer and industrial designs requiring proven SMT compatibility.
Availability
MMBZ5235BLT1 is available at Aetrix Electronics and suitable for portable electronics, sensor interface circuits, and industrial power monitoring requiring stable component supply with full RoHS and Pb-free compliance.
Supply support for MMBZ5235BLT1 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 solutions for automotive, industrial, cloud, and IoT applications.
The MMBZ52xxBLT1G series was designed specifically for compact, high-reliability voltage regulation in portable and space-constrained systems - emphasizing low-profile packaging, high ESD immunity, and consistent Zener performance across temperature.
FAQ
What is the exact Zener voltage tolerance for MMBZ5235BLT1?
The MMBZ5235BLT1 has a nominal Zener voltage of 6.8 V with a tolerance of ±5%, meaning the actual measured VZ at IZT = 20 mA falls between 6.46 V and 7.14 V. This is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet, where Min/Nom/Max values are explicitly listed as 6.46 V / 6.8 V / 7.14 V.
Does MMBZ5235BLT1 have a built-in capacitor or integrated circuitry?
No, the MMBZ5235BLT1 is a discrete silicon Zener diode with no integrated capacitors, resistors, or active circuitry. It functions solely as a two-terminal voltage reference device relying on PN-junction reverse breakdown. Its typical capacitance is <10 pF at 0 V bias, confirming its passive, non-integrated nature.
Can MMBZ5235BLT1 be used in automotive applications?
The standard MMBZ5235BLT1 is not AEC-Q101 qualified; however, the SZMMBZ5235BLT1G variant - identical electrically but with automotive-specific traceability and PPAP support - is certified for automotive use. For non-automotive industrial or consumer applications, the MMBZ5235BLT1 meets all required reliability and environmental specifications.
What is the thermal resistance of MMBZ5235BLT1 on a standard PCB?
The junction-to-ambient thermal resistance (RJA) of MMBZ5235BLT1 is 556 °C/W when mounted on an FR-5 board per the Maximum Ratings table. This value assumes standard 1.0 × 0.75 × 0.62 inch board dimensions and defines the temperature rise per milliwatt of dissipated power under those conditions.
Is Pin 2 of MMBZ5235BLT1 internally connected?
No, Pin 2 of the MMBZ5235BLT1 is explicitly designated as "No Connection" in the mechanical outline (Style 8) and Electrical Characteristics notes. It is not bonded internally and must remain unconnected on the PCB - no trace, via, or copper pour should contact this terminal.
MMBZ5235BLT1 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:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
MMBZ5235BLT1 FAQ
1.How can I place an order for MMBZ5235BLT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5235BLT1 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 MMBZ5235BLT1 reliable?
The price and inventory of MMBZ5235BLT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5235BLT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5235BLT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5235BLT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5235BLT1?
MMBZ5235BLT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5235BLT1 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 MMBZ5235BLT1?
For technical support, including MMBZ5235BLT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5235BLT1 requirements.
6.How does Aetrix verify that MMBZ5235BLT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5235BLT1 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 MMBZ5235BLT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5235BLT1?
All MMBZ5235BLT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5235BLT1, 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 MMBZ5235BLT1 part is unused and in its original packaging.
Return procedure for MMBZ5235BLT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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