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onsemi MMSZ5235BT3G
- Part No.:
- MMSZ5235BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5235BT3G.pdf
- Description:
- DIODE ZENER 6.8V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,085
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Product details
Overview
MMSZ5235BT3G from onsemi is a 500 mW, 6.8 V ±5% Zener diode in SOD−123 surface-mount package, designed for precision voltage regulation and reference applications at thermal equilibrium (TL = 30°C ±1°C). It delivers 5 mA test current (IZT), 750 Ω dynamic impedance (ZZT), 3 µA reverse leakage at 5 V (IR), and operates across −55°C to +150°C junction temperature range. It is used in power supply feedback loops, overvoltage protection circuits, and analog reference design.
For engineers reviewing the MMSZ5235BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include its 6.8 V nominal Zener voltage with ±5% tolerance, 500 mW power rating on FR-5 board, 750 Ω Zener impedance at 5 mA, cathode-anode polarity marking, and Pb-free SOD−123 package compatibility with automated assembly.
Technical Context
The MMSZ5235BT3G functions as a two-terminal, silicon planar Zener diode operating in reverse breakdown mode. Its Zener voltage is specified under thermal equilibrium conditions (TL = 30°C ±1°C), ensuring stable regulation during steady-state bias. The device exhibits a typical temperature coefficient near zero at 6.8 V, minimizing drift across −55°C to +150°C.
It supports 5 mA Zener test current (IZT) and maintains low dynamic impedance (750 Ω) at that point, enabling effective noise suppression and tight regulation in low-power reference paths. Reverse leakage remains ≤3 µA at 5 V (VR), supporting high-impedance sensing and battery-backed circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.46–7.14 V @ IZT = 5 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation (PD) | 500 mW on FR-5 board @ TL = 75°C - sets maximum continuous power handling before thermal derating |
| Zener Impedance (ZZT) | 750 Ω @ IZT = 5 mA - determines AC regulation accuracy and ripple rejection in reference circuits |
| Reverse Leakage (IR) | ≤3 µA @ VR = 5 V - ensures minimal error current in high-impedance voltage divider or sensing nodes |
| Junction Temperature Range | −55°C to +150°C - enables operation in automotive engine compartments and industrial control environments |
| ESD Rating | Class 3 (>16 kV HBM) - provides robustness against handling and board-level electrostatic discharge events |
| Package | SOD−123 (Case 425) - 1.60 × 2.69 × 1.16 mm surface-mount footprint compatible with standard reflow profiles |
Pinout & Package
SOD−123 plastic package with cathode indicated by polarity band; 2-terminal construction optimized for automated placement and reflow soldering. Maximum soldering temperature: 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener breakdown terminal | Connected to regulated voltage node; polarity band identifies this terminal for correct orientation in PCB layout |
| 2 (Anode) | Reference/ground terminal | Typically tied to circuit ground or lower potential; reverse-biased configuration establishes Zener conduction path |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW power rating on FR-5 board | Enables use in medium-current reference and clamp circuits without heatsinking on standard PCBs |
| ±5% Zener voltage tolerance | Supports cost-sensitive designs where tighter regulation is not required, balancing precision and BOM cost |
| ESD rating >16 kV (HBM) | Reduces need for external ESD protection in portable and handheld electronics |
| Pb-free, RoHS-compliant construction | Meets global environmental compliance requirements for consumer, industrial, and automotive end equipment |
| Thermal equilibrium Zener specification | Ensures published VZ values reflect stable, repeatable performance under real-world thermal conditions |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or buck-derived DC-DC converters. IC Role / Device Role / Timing Role: Provides precise 6.8 V reference for optocoupler-based feedback loop. Use Value: Maintains ±5% output regulation across line/load variations due to stable Zener voltage and low dynamic impedance. |
Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events. IC Role / Device Role / Timing Role: Shunts excess energy above 7.14 V to ground during ESD or surge events. Use Value: Limits clamping voltage to safe levels while drawing <3 µA leakage at normal operating voltage (5 V). |
| Analog Voltage Reference | Battery Monitoring Circuit |
Use Scenario: Generating stable reference for ADC input scaling in sensor signal conditioning. IC Role / Device Role / Timing Role: Supplies fixed 6.8 V reference to op-amp gain-setting network. Use Value: Delivers low-drift regulation with <0.1%/°C TC near 6.8 V, improving measurement repeatability. |
Use Scenario: Detecting low-voltage thresholds in Li-ion battery pack management systems. IC Role / Device Role / Timing Role: Forms part of resistive divider feeding comparator input for undervoltage lockout. Use Value: Ensures accurate trip point with minimal leakage-induced offset error (<3 µA at 5 V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C6V8 | 6.8 V ±1%, 300 mW, SOD-323 package, 100 Ω ZZT @ 5 mA | Higher precision and lower impedance but lower power rating and smaller package | Select when tighter voltage tolerance and lower noise are critical, and power dissipation stays below 300 mW |
| MMBZ5235BS | 6.8 V ±5%, 350 mW, SOT-23 package, 750 Ω ZZT @ 5 mA | Same Zener spec but lower power rating and different footprint requiring PCB redesign | Choose only if SOT-23 is already standardized in the design and thermal margin allows 350 mW operation |
Compared with BZX584C6V8 and MMBZ5235BS, the MMSZ5235BT3G offers the highest power handling (500 mW) in the SOD−123 form factor while maintaining identical Zener voltage tolerance and impedance-making it optimal for space-constrained yet thermally demanding regulation tasks.
Availability
MMSZ5235BT3G is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, analog reference, battery monitoring, and industrial sensor interface applications requiring stable component supply and long-term sourcing continuity.
Supply support for MMSZ5235BT3G 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 MMSZ52xxxT1G series was developed to provide reliable, surface-mount Zener regulation for cost-sensitive, high-volume applications-emphasizing manufacturability, thermal stability, and broad voltage coverage from 2.4 V to 110 V.
FAQ
What is the nominal Zener voltage and tolerance of the MMSZ5235BT3G?
The MMSZ5235BT3G has a nominal Zener voltage of 6.8 V with a ±5% tolerance, meaning its actual breakdown voltage falls between 6.46 V and 7.14 V when measured at IZT = 5 mA and under thermal equilibrium (TL = 30°C ±1°C). This tolerance is confirmed in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table on page 3 of the official onsemi datasheet for MMSZ5235BT3G.
What package type and dimensions does the MMSZ5235BT3G use?
The MMSZ5235BT3G uses the SOD−123 surface-mount package (Case 425, Style 1), measuring 1.60 mm × 2.69 mm × 1.16 mm. It features a cathode band marking and is Pb-free and RoHS-compliant. This package is optimized for automated board assembly and supports reflow soldering up to 260°C for 10 seconds, as documented in the mechanical drawings on page 6 of the MMSZ5235BT3G datasheet.
What is the maximum power dissipation and thermal derating behavior of the MMSZ5235BT3G?
The MMSZ5235BT3G is rated for 500 mW total power dissipation on an FR-5 board at lead temperature (TL) = 75°C, with linear derating of 6.7 mW/°C above that temperature. Its thermal resistance from junction-to-ambient (RJA) is 340°C/W, and junction-to-lead (RJL) is 150°C/W. These values are specified in the "MAXIMUM RATINGS" table on page 1 of the MMSZ5235BT3G datasheet.
How does the MMSZ5235BT3G perform in terms of reverse leakage and dynamic impedance?
The MMSZ5235BT3G exhibits ≤3 µA reverse leakage current (IR) at 5 V reverse bias and a maximum dynamic impedance (ZZT) of 750 Ω at IZT = 5 mA. These parameters ensure minimal loading error in high-impedance reference paths and acceptable AC regulation performance. Both values are verified in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table on page 3 of the MMSZ5235BT3G datasheet.
Is the MMSZ5235BT3G suitable for automotive applications?
Yes-the MMSZ5235BT3G is available in an automotive-grade variant (SZMMSZ5235BT3G) that is AEC-Q101 qualified and PPAP capable. While the standard MMSZ5235BT3G shares identical electrical and mechanical specs, only the SZ-prefix version is formally certified for automotive use. Designers targeting automotive applications should specify SZMMSZ5235BT3G to ensure compliance, as noted in the "Features" section on page 1 of the MMSZ5235BT3G datasheet.
MMSZ5235BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 6.8 V
- Tolerance:
- ±5%
- Power - Max:
- 500 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:
- SOD-123
MMSZ5235BT3G FAQ
1.How can I place an order for MMSZ5235BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5235BT3G 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 MMSZ5235BT3G reliable?
The price and inventory of MMSZ5235BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5235BT3G is usually 5 days.
3.What payment methods are accepted for MMSZ5235BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5235BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5235BT3G?
MMSZ5235BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5235BT3G 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 MMSZ5235BT3G?
For technical support, including MMSZ5235BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5235BT3G requirements.
6.How does Aetrix verify that MMSZ5235BT3G is sourced from the original manufacturer or authorized distributors?
All MMSZ5235BT3G 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 MMSZ5235BT3G meets industry standards.
7.What is the process for return or replacement of MMSZ5235BT3G?
All MMSZ5235BT3G units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5235BT3G, 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 MMSZ5235BT3G part is unused and in its original packaging.
Return procedure for MMSZ5235BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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