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Diodes Incorporated MMSZ5235BS-7-F
- Part No.:
- MMSZ5235BS-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MMSZ5235BS-7-F.pdf
- Description:
- DIODE ZENER 6.8V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MMSZ5235BS-7-F 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, 5 Ω zener impedance at 20 mA test current, and 3.0 µA reverse leakage at 5.0 V. It operates across –65 °C to +150 °C and is used for voltage regulation, overvoltage protection, and reference generation in low-power analog circuits.
For engineers reviewing the MMSZ5235BS-7-F datasheet, MMSZ5235BS-7-F pinout, MMSZ5235BS-7-F application, or MMSZ5235BS-7-F equivalent, this device serves as a precision, low-current voltage clamp in space-constrained PCBs where SOD323 footprint compatibility, thermal stability, and RoHS-compliant lead-free plating are required.
Technical Context
This Zener diode employs planar die construction for stable breakdown characteristics and low dynamic impedance. Its 6.8 V nominal zener voltage is specified at 20 mA test current (IZT), with typical zener impedance of 5 Ω at IZT and 750 Ω at knee current (0.25 mA), enabling reliable regulation under light-load and transient conditions.
The device is housed in an SOD323 package with cathode band polarity marking, rated for 200 mW at 25 °C ambient and derated linearly above 25 °C per a 625 °C/W junction-to-ambient thermal resistance. It exhibits ≤3.0 µA reverse leakage at VR = 5.0 V and maintains operation from –65 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 6.8 V - Stable regulation point at 20 mA, suitable for 5 V rail clamping or 6.8 V reference generation |
| Zener Voltage Range | 6.46–7.14 V - ±5% tolerance ensures predictable clamping within design margins |
| Power Dissipation | 200 mW - Limits continuous current to ~29 mA at 6.8 V; requires thermal-aware pad layout |
| Zener Impedance | 5 Ω @ 20 mA - Low dynamic resistance preserves regulation accuracy under varying load |
| Reverse Leakage | 3.0 µA @ 5.0 V - Minimal standby current draw in high-impedance bias networks |
| Junction Temp Range | –65 °C to +150 °C - Supports industrial and automotive under-hood environments |
| Package | SOD323 - 1.7 mm × 1.3 mm footprint ideal for dense, automated PCB assembly |
Pinout & Package
Package: SOD323 - surface-mount plastic case, cathode indicated by band, 0.004 g weight, UL 94V-0 rated, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener knee reference | Connected to lower-potential node; defines reverse-bias orientation for regulation |
| Cathode | Zener breakdown terminal / regulated output node | Marked with band; connected to higher-potential rail to clamp voltage at VZ |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable breakdown voltage and low long-term drift under thermal cycling |
| Lead-free & RoHS-compliant plating | Matte tin finish over Alloy 42 leadframe meets global environmental compliance mandates |
| SOD323 package | Enables high-density placement and compatibility with standard 0805 reflow profiles |
| Low zener impedance (5 Ω) | Minimizes output voltage variation across 1–20 mA load range in reference applications |
| Halogen- and antimony-free | Meets "Green" definition: Br < 900 ppm, Cl < 900 ppm, Br+Cl < 1500 ppm, Sb < 1000 ppm |
Applications
| Power Supply Rail Clamp | ADC Reference Stabilizer |
|---|---|
|
Use Scenario: Clamping 5 V logic supply against ESD transients or LDO overshoot in microcontroller peripherals. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to limit voltage excursion to ≤7.14 V. Use Value: Prevents latch-up or oxide damage in downstream ICs without adding series resistance or response delay. |
Use Scenario: Providing stable 6.8 V reference for 12-bit SAR ADC biasing in sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Low-impedance shunt reference source delivering <3 µA leakage and <5 Ω dynamic resistance. Use Value: Enables ≤0.1% full-scale error contribution from reference drift across temperature and load. |
| Overvoltage Protection Circuit | Low-Power Voltage Monitor |
|
Use Scenario: Protecting USB-C port VBUS detection circuitry from accidental 9 V adapter misconnection. IC Role / Device Role / Timing Role: Shunt regulator activated when input exceeds 7.14 V, diverting excess current to ground. Use Value: Absorbs up to 200 mW surge energy without external TVS, reducing BOM count and board area. |
Use Scenario: Monitoring battery voltage in coin-cell-powered IoT nodes using comparator hysteresis with Zener threshold. IC Role / Device Role / Timing Role: Precision 6.8 V threshold element defining upper trip point in undervoltage lockout (UVLO) logic. Use Value: Delivers consistent trip point across –40 °C to +85 °C with <±2% total variation including tempco and tolerance. |
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 SOD523 package (1.3 × 0.85 mm); 300 mW rating; 10 Ω Zzt | Higher power handling but smaller footprint; less thermal mass for pulse absorption | Select when higher surge capability is needed and PCB real estate allows tighter pitch routing |
| MMBZ5235BLT1G | SOT-23 package; same 6.8 V spec; 225 mW rating; 7 Ω Zzt; 10x larger footprint than SOD323 | Greater thermal dissipation margin; compatible with legacy SOT-23 pick-and-place tooling | Select when production line uses SOT-23 feeders or board layout permits larger device |
Compared with BZX584C6V8 and MMBZ5235BLT1G, MMSZ5235BS-7-F offers the smallest footprint (SOD323), lowest zener impedance (5 Ω), and tightest thermal profile for ultra-dense portable designs-making it optimal where board area and regulation precision outweigh raw power handling needs.
Availability
MMSZ5235BS-7-F is available at Aetrix Electronics and suitable for voltage reference generation, low-power rail clamping, and overvoltage protection circuits requiring stable component supply, consistent parametric performance, and full RoHS/Green compliance.
Supply support for MMSZ5235BS-7-F 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.
The MMSZ52xxBS series belongs to Diodes' general-purpose Zener diode product line, engineered specifically for compact, high-reliability voltage regulation in consumer, computing, and industrial applications where SOD323 footprint and green compliance are mandatory.
FAQ
What is the maximum reverse voltage (VR) at which leakage remains ≤3.0 µA?
The datasheet specifies 3.0 µA maximum reverse leakage current at VR = 5.0 V. At VR = 6.0 V, leakage rises to approximately 10 µA, and at VR = 6.8 V (nominal zener voltage), leakage is not guaranteed but typically remains below 50 µA. For design margin, use 5.0 V as the maximum non-breakdown bias voltage.
Can MMSZ5235BS-7-F be used in place of a 6.2 V Zener like MMSZ5234BS?
No-MMSZ5235BS-7-F has a nominal zener voltage of 6.8 V (6.46–7.14 V), while MMSZ5234BS is 6.2 V (5.89–6.51 V). Substituting them changes the regulation threshold by ~10%, potentially causing overvoltage stress or failure to clamp. Always match nominal VZ and tolerance bands for functional equivalence.
Is the SOD323 package compatible with standard reflow profiles for lead-free soldering?
Yes-the SOD323 package is qualified for JEDEC J-STD-020D Level 1 moisture sensitivity and supports peak reflow temperatures up to 260 °C. Diodes Incorporated recommends using the pad layout from AP02001 and following IPC-J-STD-020 guidelines for optimal solder joint reliability and thermal performance.
How does thermal derating affect usable power at 85 °C ambient?
With RθJA = 625 °C/W and TJ(max) = +150 °C, the allowable power at 85 °C ambient is calculated as (150 − 85) / 625 = 0.104 W (104 mW). This is 52% of the 200 mW rating at 25 °C, meaning continuous current must be limited to ~15.3 mA at 6.8 V to avoid exceeding junction temperature limits.
MMSZ5235BS-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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 (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
MMSZ5235BS-7-F FAQ
1.How can I place an order for MMSZ5235BS-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5235BS-7-F 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-F reliable?
The price and inventory of MMSZ5235BS-7-F 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-F is usually 5 days.
3.What payment methods are accepted for MMSZ5235BS-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5235BS-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5235BS-7-F?
MMSZ5235BS-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5235BS-7-F 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-F?
For technical support, including MMSZ5235BS-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5235BS-7-F requirements.
6.How does Aetrix verify that MMSZ5235BS-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5235BS-7-F 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-F meets industry standards.
7.What is the process for return or replacement of MMSZ5235BS-7-F?
All MMSZ5235BS-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5235BS-7-F, 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-F part is unused and in its original packaging.
Return procedure for MMSZ5235BS-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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