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onsemi MMBZ5235BLT3
- Part No.:
- MMBZ5235BLT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
MMBZ5235BLT3.pdf
- Description:
- DIODE ZENER 6.8V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
MMBZ5235BLT3 from onsemi is a 6.8 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 5 Ω dynamic impedance at 20 mA test current and 3 µA leakage current at 5 V reverse bias. It serves as a precision voltage reference or overvoltage clamp in space-constrained portable electronics.
For engineers reviewing the MMBZ5235BLT3 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), low dynamic impedance (5 Ω), ESD robustness (>16 kV HBM), AEC-Q101 qualification status, and Pb-free SOT-23 packaging compatibility with automated assembly.
Technical Context
This device operates as a two-terminal voltage regulation element, conducting in reverse breakdown to maintain stable voltage across its cathode-anode terminals. Its 6.8 V nominal Zener voltage is specified at 20 mA test current (IZT), with temperature coefficient near zero - typical for mid-voltage Zeners in this series.
The SOT-23 package features pin 1 (anode), pin 2 (no connection), and pin 3 (cathode), enabling unidirectional clamping or reference functions without polarity ambiguity. Thermal resistance is 556 °C/W on FR-5 board, limiting continuous power handling under ambient conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.46–7.14 V at IZT = 20 mA - defines stable regulation range for reference or clamp use |
| Power Dissipation | 225 mW on FR-5 board - sets maximum continuous DC or pulsed power in standard PCB layouts |
| Zener Impedance (ZZT) | 5 Ω at IZT = 20 mA - ensures minimal voltage shift under load variation |
| Leakage Current (IR) | 3 µA at VR = 5 V - guarantees low standby current in battery-powered systems |
| ESD Rating | Class 3 (>16 kV) per HBM - supports robust handling in manufacturing and end-use environments |
| Operating Temperature | −65 °C to +150 °C - enables deployment in automotive under-hood and industrial control applications |
Pinout & Package
SOT-23 (Case 318, Style 8) surface-mount package with molded thermosetting plastic body, UL 94 V-0 flammability rating, and corrosion-resistant solderable finish. Maximum soldering temperature is 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward conduction terminal; connects to lower-potential node in clamp/reference configuration |
| 2 | No Connection | Internally isolated; no electrical function - must remain unconnected on PCB |
| 3 | Cathode | Reverse breakdown terminal; connects to higher-potential node for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating | Enables compact voltage regulation without heatsinking on standard FR-5 PCBs |
| AEC-Q101 Qualified | Validated for automotive applications including infotainment power rails and sensor interfaces |
| Pb-Free Packaging | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 |
| ESD Robustness | Withstands >16 kV human-body-model discharge - reduces need for external protection in handheld designs |
| Small Outline Package | SOT-23 footprint (2.9 × 1.3 × 1.0 mm) supports high-density layout in smartphones and wearables |
Applications
| Smartphone Power Rail Protection | Automotive Cabin Sensor Reference |
|---|---|
|
Use Scenario: Clamping transient spikes on 5 V USB interface lines during hot-plug events. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing fast overvoltage protection. Use Value: 5 Ω Zener impedance limits voltage overshoot to <±0.1 V under 20 mA surge, preserving downstream IC integrity. |
Use Scenario: Supplying stable 6.8 V reference to analog front-end of cabin temperature sensor. IC Role / Device Role / Timing Role: Passive voltage reference source with minimal quiescent current draw. Use Value: 3 µA leakage at 5 V ensures <1 µW standby power - critical for always-on sensor nodes. |
| Industrial PLC Input Conditioning | Medical Wearable Battery Monitor |
|
Use Scenario: Level-shifting and noise filtering for 24 V digital input signals before MCU GPIO sampling. IC Role / Device Role / Timing Role: Zener-based voltage translator and ESD suppressor in signal chain. Use Value: Class 3 HBM rating eliminates need for discrete TVS diodes, reducing BOM count by one component. |
Use Scenario: Monitoring lithium-ion cell voltage via resistive divider with regulated reference. IC Role / Device Role / Timing Role: Precision voltage reference stabilizing ADC measurement accuracy. Use Value: ±5% VZ tolerance ensures ±0.34 V absolute error at 6.8 V - sufficient for ±1% battery SOC estimation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C6V8 | Same 6.8 V nominal, but 350 mW rating and 15 Ω ZZT; SOT-23 package with identical pinout | Higher power handling suits higher-current clamping; less precise regulation due to higher impedance | Select when surge energy exceeds 225 mW but tighter voltage stability is not required |
| MMSZ5235ET1G | Identical 6.8 V spec, same 5 Ω ZZT, but rated for 350 mW and offered in SOD-123 package | Larger footprint allows better thermal performance; incompatible with SOT-23 land pattern | Choose when board layout permits SOD-123 and thermal margin is prioritized over space constraints |
Compared with BZX84-C6V8 and MMSZ5235ET1G, the MMBZ5235BLT3 delivers optimal balance of low-impedance regulation (5 Ω), ultra-compact SOT-23 size, and AEC-Q101 qualification - making it preferred for automotive and portable designs where space, precision, and reliability are jointly constrained.
Availability
MMBZ5235BLT3 is available at Aetrix Electronics and suitable for smartphone power rail protection, automotive cabin sensor reference, and industrial PLC input conditioning requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for MMBZ5235BLT3 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 delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZ52xxBLT3 series belongs to onsemi's precision Zener voltage regulator product line, engineered specifically for space-constrained, high-reliability applications demanding tight voltage tolerance, low dynamic impedance, and automotive-grade qualification.
FAQ
What is the Zener voltage tolerance of MMBZ5235BLT3?
The MMBZ5235BLT3 has a Zener voltage range of 6.46 V to 7.14 V at IZT = 20 mA, corresponding to a ±5% tolerance around the nominal 6.8 V value. This tolerance is guaranteed across the full operating temperature range of −65 °C to +150 °C and is verified per production test limits in the official onsemi datasheet revision 10.
Is MMBZ5235BLT3 suitable for automotive applications?
Yes, MMBZ5235BLT3 is AEC-Q101 qualified and PPAP capable, confirming its suitability for automotive applications including infotainment subsystems, body electronics, and cabin sensor interfaces. The device meets stress testing requirements for temperature cycling, humidity, mechanical shock, and ESD - all validated per the AEC-Q101 standard.
What is the thermal resistance of MMBZ5235BLT3 on FR-5 board?
The junction-to-ambient thermal resistance (RJA) of MMBZ5235BLT3 is 556 °C/W when mounted on FR-5 board. This value determines the maximum allowable ambient temperature for safe 225 mW operation: at 25 °C ambient, junction temperature reaches ~160 °C - within the −65 °C to +150 °C storage limit but approaching the upper edge of continuous operation.
Does MMBZ5235BLT3 have a no-connect pin, and how should it be handled on PCB?
Yes, MMBZ5235BLT3 has pin 2 designated as "No Connection" per the official onsemi datasheet. This terminal is internally isolated and must remain unconnected on the PCB layout. Routing traces or placing vias to pin 2 may cause unintended coupling or assembly defects and violates the manufacturer's mechanical and electrical design guidance.
What is the forward voltage specification for MMBZ5235BLT3?
The forward voltage (VF) of MMBZ5235BLT3 is specified as ≤0.95 V at IF = 10 mA, measured with anode positive relative to cathode. This parameter applies only during forward conduction mode and is relevant for polarity-check circuits or dual-purpose clamp configurations where forward conduction may occur during fault conditions.
MMBZ5235BLT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MMBZ5235BLT3 FAQ
1.How can I place an order for MMBZ5235BLT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5235BLT3 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 MMBZ5235BLT3 reliable?
The price and inventory of MMBZ5235BLT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5235BLT3 is usually 5 days.
3.What payment methods are accepted for MMBZ5235BLT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5235BLT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5235BLT3?
MMBZ5235BLT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5235BLT3 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 MMBZ5235BLT3?
For technical support, including MMBZ5235BLT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5235BLT3 requirements.
6.How does Aetrix verify that MMBZ5235BLT3 is sourced from the original manufacturer or authorized distributors?
All MMBZ5235BLT3 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 MMBZ5235BLT3 meets industry standards.
7.What is the process for return or replacement of MMBZ5235BLT3?
All MMBZ5235BLT3 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5235BLT3, 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 MMBZ5235BLT3 part is unused and in its original packaging.
Return procedure for MMBZ5235BLT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5235BLT3 Tags
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