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Diodes Incorporated MMBZ5235B-7-F
- Part No.:
- MMBZ5235B-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5235B-7-F.pdf
- Description:
- DIODE ZENER 6.8V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:18,181
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Product details
Overview
MMBZ5235B-7-F from Diodes Incorporated is a 6.8V, 350mW surface-mount Zener diode in SOT23 package, designed for precision voltage regulation and overvoltage protection in low-power analog and digital circuits. It delivers ±5% nominal Zener voltage tolerance (6.46–7.14V), 5Ω dynamic impedance at 20mA test current, and ≤3.0µA reverse leakage at 5.0V, enabling stable reference generation in space-constrained PCBs.
For engineers reviewing the MMBZ5235B-7-F datasheet, MMBZ5235B-7-F pinout, MMBZ5235B-7-F application, or MMBZ5235B-7-F equivalent, this part supports critical functions including voltage clamping in I/O protection, biasing in sensor signal conditioning, and low-current reference in battery-powered wearables and industrial controllers where thermal stability and JEDEC-compliant reliability are required.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 6.8V at 20mA test current (IZT), exhibiting low dynamic impedance (ZZT = 5Ω) and tight voltage distribution (±5%). Its planar die construction ensures consistent parametric performance across temperature and lifetime.
Rated for 350mW power dissipation on FR-4 PCB with RθJA = 357°C/W, it maintains stable regulation from –65°C to +150°C ambient, and meets JEDEC high-reliability standards for industrial and automotive-qualified derivatives (Q-suffix variants).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.8V nominal, 6.46–7.14V range at 20mA - defines precise clamping threshold for 5V/6V rail protection |
| Power Dissipation (PD) | 350mW on FR-4 PCB - supports continuous operation in compact consumer and industrial PCB layouts |
| Zener Impedance (ZZT) | 5Ω at IZT = 20mA - ensures minimal voltage deviation under load transients in reference circuits |
| Reverse Leakage (IR) | ≤3.0µA at VR = 5.0V - enables low-quiescent-current bias networks without significant error contribution |
| Thermal Resistance (RθJA) | 357°C/W - allows direct thermal modeling for derating above 25°C ambient per Fig. 1 |
| Operating Temperature | –65°C to +150°C - suitable for under-hood automotive modules and wide-range industrial sensors |
Pinout & Package
Package: SOT23 - 3-terminal surface-mount plastic package with matte tin-plated Alloy 42 leadframe, UL 94V-0 rated, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground | Connected to system ground or lower-potential node during Zener operation; required for correct polarity in clamp configuration |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Connected to protected line or reference point; carries reverse current during overvoltage events |
| No-Connect (Pin 3) | Internal die attach pad / mechanical support | Electrically isolated; serves as thermal path and mechanical anchor-must be soldered to copper pour for optimal thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight VZ distribution (±5%) and repeatable ZZT across production lots for predictable circuit behavior |
| 350mW FR-4 power rating | Supports sustained 20mA Zener current without external heatsinking in standard PCB layouts |
| Lead-free & RoHS 3 compliant | Fully compliant with EU Directive 2015/863/EU; <900ppm Br+Cl, <1000ppm Sb - meets global environmental compliance requirements |
| JEDEC high-reliability qualification | Validated per AEC-Q stress protocols - provides confidence in long-term stability for industrial control and automotive auxiliary systems |
Applications
| USB Port ESD Protection | Microcontroller I/O Clamp |
|---|---|
|
Use Scenario: Clamping transient voltages on USB D+/D− lines during hot-plug or ESD events. IC Role / Device Role / Timing Role: Zener diode acts as bidirectional shunt regulator, limiting line voltage to ≤7.14V before TVS activation. Use Value: Prevents latch-up in USB PHY ICs by holding differential swing within safe margin while consuming <350mW peak power. |
Use Scenario: Protecting GPIO pins of ARM Cortex-M microcontrollers against overvoltage from external sensors or connectors. IC Role / Device Role / Timing Role: Low-impedance Zener sink absorbs fault current during 5V-to-3.3V interface mismatches or cable-induced surges. Use Value: Maintains pin voltage ≤7.14V with <5Ω dynamic resistance, ensuring no damage to 3.3V I/O structures even at 20mA surge. |
| Temperature Sensor Bias Network | Low-Power Reference Generator |
|
Use Scenario: Providing stable bias current to silicon bandgap temperature sensors in battery-operated IoT nodes. IC Role / Device Role / Timing Role: Zener establishes fixed 6.8V reference to drive constant-current source feeding sensor element. Use Value: ≤3.0µA leakage at 5V ensures <100nA error contribution to bias current, preserving ±0.5°C measurement accuracy. |
Use Scenario: Generating a low-drift 6.8V reference for ADC front-end amplifiers in portable medical devices. IC Role / Device Role / Timing Role: Functions as passive voltage reference with minimal self-heating due to 350mW rating and SOT23 thermal design. Use Value: 5Ω ZZT limits output variation to <100mV under 10mA load changes, meeting 12-bit ADC full-scale error budget. |
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 (Nexperia) | Same 6.8V nominal, 300mW rating, SOT23 package; higher ZZT (10Ω) and wider VZ tolerance (±6%) | Lower power handling reduces margin in sustained clamp scenarios; acceptable for intermittent protection only | Select when cost sensitivity outweighs need for tight regulation and thermal headroom |
| MM3Z6V8 (ON Semiconductor) | Identical 6.8V/350mW spec, but rated for 150°C max junction temperature vs. Diodes' 150°C ambient; slightly higher IR (5µA @ 5V) | Marginally reduced leakage sensitivity in ultra-low-power bias networks | Prefer for legacy ON Semi design continuity; verify leakage impact in sub-µA bias paths |
Compared with BZX84-C6V8 and MM3Z6V8, MMBZ5235B-7-F offers the lowest Zener impedance (5Ω) and tightest voltage tolerance (±5%), making it optimal for precision reference and high-reliability clamp applications where thermal stability and parametric consistency are critical.
Availability
MMBZ5235B-7-F is available at Aetrix Electronics and suitable for USB interface protection, microcontroller I/O clamping, and low-power sensor biasing requiring stable component supply across high-mix production runs and long-lifecycle designs.
Supply support for MMBZ5235B-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, specializing in high-efficiency power management, signal integrity, and protection solutions for industrial, automotive, and consumer markets.
This device belongs to the MMBZ52xxB series of 350mW Zener diodes, engineered for automated SMT assembly and high-reliability voltage regulation in space-constrained, thermally demanding environments.
FAQ
What is the maximum continuous Zener current for MMBZ5235B-7-F at 70°C ambient?
At 70°C ambient, the power derating curve (Fig. 1) reduces allowable dissipation to ~250mW. With VZ ≈ 6.8V, maximum continuous Zener current is ~37mA. Exceeding this risks thermal runaway due to increased junction temperature beyond 150°C limit.
Can MMBZ5235B-7-F replace a 6.2V Zener in an existing circuit?
No - its 6.8V nominal Zener voltage differs significantly from 6.2V. Substituting would raise clamping threshold by 0.6V, potentially allowing damaging overvoltage on protected nodes. Use MMBZ5234B-7-F (6.2V) for direct replacement.
Is the SOT23 pinout standardized across manufacturers for this Zener type?
Yes - Pin 1 is Anode, Pin 2 is Cathode, Pin 3 is NC (die attach). Diodes' SOT23 outline matches JEDEC TO-236AB, and all major suppliers (Nexperia, ON Semi, Vishay) use identical pin mapping for Zener diodes in this package.
Does MMBZ5235B-7-F require a series resistor in all applications?
Yes - a current-limiting resistor is mandatory to prevent exceeding 350mW dissipation. For example, with 12V input and 6.8V Zener, minimum resistor value is (12V − 6.8V)/0.02A = 260Ω to maintain 20mA IZT without thermal overload.
MMBZ5235B-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 6.8 V
- Tolerance:
- ±5%
- Power - Max:
- 350 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
MMBZ5235B-7-F FAQ
1.How can I place an order for MMBZ5235B-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5235B-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 MMBZ5235B-7-F reliable?
The price and inventory of MMBZ5235B-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 MMBZ5235B-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5235B-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5235B-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5235B-7-F?
MMBZ5235B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5235B-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 MMBZ5235B-7-F?
For technical support, including MMBZ5235B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5235B-7-F requirements.
6.How does Aetrix verify that MMBZ5235B-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5235B-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 MMBZ5235B-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5235B-7-F?
All MMBZ5235B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5235B-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 MMBZ5235B-7-F part is unused and in its original packaging.
Return procedure for MMBZ5235B-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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