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Diodes Incorporated MMSZ5235BS-7
- Part No.:
- MMSZ5235BS-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MMSZ5235BS-7.pdf
- Description:
- DIODE ZENER 6.8V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:8,184
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Product details
Overview
MMSZ5235BS-7 from Diodes Incorporated is a surface-mount silicon Zener diode with a nominal zener voltage of 6.8 V, ±5% tolerance (6.46–7.14 V), 200 mW power dissipation, and 5 Ω zener impedance at 20 mA test current. It operates across –65 °C to +150 °C and is used for voltage regulation and reference in low-power analog circuits, power supply feedback paths, and overvoltage protection in consumer and industrial electronics.
For engineers reviewing the MMSZ5235BS-7 datasheet, MMSZ5235BS-7 pinout, MMSZ5235BS-7 application, or MMSZ5235BS-7 equivalent, key selection criteria include its SOD-323 package footprint, 3.0 µA reverse leakage at 5.0 V, 0.9 V forward voltage at 10 mA, thermal resistance of 625 °C/W, and compatibility with automated SMT assembly processes.
Technical Context
This Zener diode employs planar die construction for stable breakdown characteristics and low dynamic impedance. Its operation relies on controlled avalanche and Zener mechanisms depending on voltage level - at 6.8 V, both mechanisms contribute, yielding predictable regulation with minimal temperature coefficient drift.
The device is optimized for low-current regulation (IZT = 20 mA) and exhibits tight voltage distribution (±5%), low capacitance (~15 pF at 0 V bias), and fast response to transient overvoltage events due to its small junction area and low parasitic inductance inherent to the SOD-323 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nom) | 6.8 V - precise DC reference point for feedback loops and voltage clamping |
| Zener Voltage Range | 6.46–7.14 V - ensures design margin compliance under manufacturing variation |
| Power Dissipation | 200 mW - limits continuous regulation current to ~29 mA at 6.8 V without heatsinking |
| Zener Impedance | 5 Ω @ 20 mA - maintains <34 mV output variation for ±10 mA load changes |
| Reverse Leakage | 3.0 µA @ 5.0 V - negligible error contribution in high-impedance reference nodes |
| Forward Voltage | 0.9 V @ 10 mA - enables use as polarity-sensitive clamp or logic-level detector |
| Thermal Resistance | 625 °C/W - requires derating above 25 °C ambient; full power only at TA ≤ 25 °C |
Pinout & Package
Package: SOD-323 - ultra-compact 2-pin surface-mount plastic case (2.30–2.70 mm length, 1.20–1.40 mm width, 0.25–0.35 mm thickness), UL 94V-0 rated, moisture sensitivity level 1, cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to lower-potential node in Zener mode | Enables bidirectional functionality: forward conduction (clamping) or reverse breakdown (regulation) |
| Cathode | Current exit terminal in forward bias; connected to higher-potential node in Zener mode | Band-marked terminal; defines polarity for correct orientation in voltage-reference or overvoltage-protection layouts |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable Zener voltage distribution and long-term stability under thermal cycling |
| SOD-323 package | Reduces PCB area by >50% vs. DO-35; compatible with standard 0805 pick-and-place equipment |
| Lead-free & RoHS compliant | Meets EU Directive 2011/65/EU; matte tin plating prevents solder joint intermetallic growth |
| Halogen- and antimony-free | Contains <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - satisfies IPC-1752A "Green" requirements |
| Automated assembly ready | Terminal finish and geometry meet MIL-STD-202 Method 208 solderability specs for reflow reliability |
Applications
| Power Supply Feedback | Overvoltage Protection |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or buck-boost converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Provides stable 6.8 V reference to TL431 shunt regulator or directly biases optocoupler LED. Use Value: Tight 6.46–7.14 V tolerance ensures ±1.5% output regulation accuracy without trimming. |
Use Scenario: Clamping transient surges on 5 V I/O lines in microcontroller peripherals or sensor interfaces. IC Role / Device Role / Timing Role: Acts as shunt protector, conducting excess energy when line voltage exceeds 6.8 V + forward drop. Use Value: Low 5 Ω dynamic impedance limits clamping voltage overshoot to <7.2 V during 100 ns transients. |
| Voltage Reference | Signal Level Shifting |
Use Scenario: Generating precision bias points for op-amp comparators or ADC reference dividers in battery-powered sensors. IC Role / Device Role / Timing Role: Supplies low-drift, low-noise DC reference in high-impedance divider networks. Use Value: 3.0 µA leakage at 5 V ensures <0.1% error in 1 MΩ divider arms at room temperature. |
Use Scenario: Translating 3.3 V logic signals to 5 V-tolerant inputs using passive level-shifting with pull-up resistors. IC Role / Device Role / Timing Role: Clamps negative excursions below ground while permitting positive swing up to 6.8 V. Use Value: 0.9 V forward voltage enables safe negative swing limiting without forward conduction distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C6V8 | Same 6.8 V nominal, but ±2% tolerance and 300 mW rating in SOD-523 | Higher power handling supports 44 mA max current; tighter tolerance improves reference accuracy | Select when tighter voltage tolerance or higher surge capability is required; SOD-523 footprint differs |
| MMBZ5235BS | Identical electrical specs, but in SOT-23 package (larger, 3-pin, anode/cathode/emitter) | SOT-23 allows easier manual probing and higher thermal mass; not pin-compatible with SOD-323 layout | Choose for prototyping or thermal-limited designs where board space permits larger footprint |
Compared with BZX584C6V8 and MMBZ5235BS, MMSZ5235BS-7 offers optimal balance of miniaturization, cost, and performance for high-volume SMT production - its SOD-323 size minimizes PCB area while maintaining sufficient regulation fidelity for non-critical references and protection functions.
Availability
MMSZ5235BS-7 is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and voltage reference applications requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.
Supply support for MMSZ5235BS-7 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
MMSZ5235BS-7 belongs to the MMSZ52xxBS series of general-purpose Zener diodes designed specifically for compact, high-reliability voltage regulation in space-constrained consumer, computing, and industrial power systems.
FAQ
What is the maximum continuous Zener current for MMSZ5235BS-7 at 25°C ambient?
At 25°C ambient, the maximum continuous Zener current is approximately 29.4 mA, calculated from PD = 200 mW and VZ = 6.8 V. Derating begins above 25°C per the 625 °C/W thermal resistance curve - at 75°C ambient, max current drops to ~16 mA to maintain junction temperature ≤150°C.
Is MMSZ5235BS-7 suitable for use in automotive applications?
MMSZ5235BS-7 is not AEC-Q200 qualified and lacks automotive-grade screening or extended temperature validation beyond its specified –65 °C to +150 °C operating range. It may be used in non-safety-critical automotive subsystems (e.g., infotainment power rails) if customer-qualified, but Diodes Incorporated does not guarantee automotive reliability without additional qualification testing.
How does the 5 Ω Zener impedance affect regulation accuracy under load variation?
A 5 Ω dynamic impedance means that for every 1 mA change in Zener current, the regulated voltage shifts by 5 mV. At 20 mA nominal current, a ±5 mA load step causes ±25 mV output variation - acceptable for most non-precision references but insufficient for sub-10 mV stability requirements without post-regulation filtering.
Can MMSZ5235BS-7 replace a 1N4735A in existing designs?
No - the 1N4735A is a through-hole DO-41 device rated for 1 W, whereas MMSZ5235BS-7 is a 200 mW SOD-323 surface-mount part. Direct replacement risks thermal failure under identical current conditions. A redesign with current limiting and layout adaptation is required; consider MMBZ5235BS (SOT-23) as a closer form-factor alternative if higher power is needed.
MMSZ5235BS-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 6.8 V
- Tolerance:
- ±5%
- Power - Max:
- 200 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:
- SOD-323
MMSZ5235BS-7 FAQ
1.How can I place an order for MMSZ5235BS-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5235BS-7 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 MMSZ5235BS-7 reliable?
The price and inventory of MMSZ5235BS-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5235BS-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5235BS-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5235BS-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5235BS-7?
MMSZ5235BS-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5235BS-7 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 MMSZ5235BS-7?
For technical support, including MMSZ5235BS-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5235BS-7 requirements.
6.How does Aetrix verify that MMSZ5235BS-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5235BS-7 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 MMSZ5235BS-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5235BS-7?
All MMSZ5235BS-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5235BS-7, 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 MMSZ5235BS-7 part is unused and in its original packaging.
Return procedure for MMSZ5235BS-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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