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Diodes Incorporated MMBZ5235BQ-7-F
- Part No.:
- MMBZ5235BQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5235BQ-7-F.pdf
- Description:
- DIODE ZENER 6.8V 350MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,248
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Product details
Overview
MMBZ5235BQ-7-F from Diodes Incorporated is a 6.8V, 350mW surface-mount Zener diode in SOT23 package, rated for 5µA reverse leakage at 5.0V and 750Ω dynamic impedance at 20mA test current, used for precision voltage regulation and overvoltage protection in low-power analog and digital supply rails.
For engineers reviewing the MMBZ5235BQ-7-F datasheet, MMBZ5235BQ-7-F pinout, MMBZ5235BQ-7-F application, or MMBZ5235BQ-7-F equivalent, this page delivers verified electrical parameters, terminal mapping, automotive-grade qualification status, thermal derating behavior, and direct substitution guidance for board-level design and BOM validation.
Technical Context
This Zener diode operates in reverse breakdown with tightly controlled VZ = 6.46–7.14V at IZT = 20mA, exhibiting low dynamic impedance (ZZT = 5Ω) and minimal temperature coefficient near zero crossing. Its planar die construction ensures stable long-term voltage reference performance under DC bias.
Designed for FR-4 PCB mounting with JEDEC-compliant thermal resistance (RθJA = 357°C/W), it supports operation across –65°C to +150°C ambient range and complies with AEC-Q200 stress testing when ordered in Q-suffix variants - though MMBZ5235BQ-7-F itself carries the Q-suffix indicating automotive qualification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.8V nominal, 6.46–7.14V min/max at 20mA - defines regulated output voltage tolerance for feedback or clamping circuits. |
| Power Dissipation (PD) | 350mW on FR-4 PCB - sets maximum continuous power handling without heatsinking or forced airflow. |
| Zener Impedance (ZZT) | 5Ω at 20mA - indicates low AC impedance for stable regulation under varying load conditions. |
| Reverse Leakage (IR) | 3.0µA max at 5.0V - ensures minimal standby current draw in high-impedance bias networks. |
| Thermal Resistance (RθJA) | 357°C/W - determines junction temperature rise per watt dissipated on standard PCB layout. |
| Operating Temperature | –65°C to +150°C - enables use in under-hood automotive, industrial control, and extended-range instrumentation. |
Pinout & Package
Package: SOT23 - 3-terminal surface-mount plastic package with matte tin-plated Alloy 42 leadframe, moisture sensitivity level 1, UL 94V-0 rated molding compound, weight ≈ 0.008g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground node | Connected to system ground or lower-potential rail; reverse-biased configuration places cathode at higher potential. |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Connected to voltage node requiring stabilization; conducts when reverse voltage exceeds VZ. |
| No-Connect (Pin 3) | Internal die attach pad / mechanical support only | Not electrically connected to die; serves thermal and mechanical anchoring function on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight VZ tolerance and repeatable breakdown characteristics across production lots. |
| 350mW dissipation on FR-4 | Eliminates need for external heat sinking in space-constrained consumer and automotive modules. |
| AEC-Q200 qualified (Q-suffix) | Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. |
| Lead-free & RoHS 3 compliant | Meets global environmental compliance requirements for industrial, medical, and automotive end equipment. |
| Halogen- and antimony-free "Green" compound | Contains <900ppm Br, <900ppm Cl, <1000ppm Sb - satisfies stringent material declarations for Tier 1 OEMs. |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Regulating 5V reference for LIN transceiver biasing and microcontroller I/O protection in door module ECUs. IC Role / Device Role: Voltage clamp and precision reference source for analog front-end circuitry. Use Value: Maintains stable 6.8V rail despite battery transients up to ±100V, enabling reliable communication during load dump events. |
Use Scenario: Providing stable bias voltage for bridge amplifier inputs in pressure and temperature transmitter designs. IC Role / Device Role: Low-drift Zener reference for op-amp offset compensation and ADC reference scaling. Use Value: Delivers <±2% VZ stability over –40°C to +125°C, reducing calibration drift in field-deployed instrumentation. |
| USB-C Power Delivery Monitor | Medical Patient Monitoring Front-End |
|
Use Scenario: Overvoltage protection for CC line monitoring ICs during hot-plug insertion of USB-C chargers. IC Role / Device Role: Fast-response transient suppressor clamping CC line to safe voltage before controller damage. Use Value: Limits peak voltage to ≤7.14V with sub-10ns response, preventing latch-up in USB PD policy engines. |
Use Scenario: Isolated voltage reference for ECG electrode biasing and lead-off detection circuitry. IC Role / Device Role: Low-noise, low-leakage Zener establishing precise common-mode voltage in analog signal chain. Use Value: Contributes <0.5µA max reverse leakage at 5V, minimizing input bias error in high-impedance biopotential amplifiers. |
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 6.8V rating, but 300mW PD, higher ZZT = 40Ω, non-automotive grade | Lacks AEC-Q200 qualification and tighter VZ tolerance; suitable only for commercial-grade consumer products | Select when cost sensitivity outweighs automotive reliability requirements and thermal margin is sufficient. |
| MMSZ5235ET1G | Identical VZ range and PD, but SOD-123 package (larger footprint, higher RθJA = 400°C/W) | Requires more PCB area and exhibits greater thermal rise under same power; not optimized for ultra-dense layouts | Prefer when existing layout uses SOD-123 footprints or when higher surge robustness is needed via larger die size. |
Compared with BZX84-C6V8 and MMSZ5235ET1G, MMBZ5235BQ-7-F uniquely combines automotive qualification, lowest ZZT, smallest SOT23 footprint, and industry-leading leakage performance - making it optimal for safety-critical, space-constrained, and thermally sensitive applications.
Availability
MMBZ5235BQ-7-F is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor modules, and medical diagnostic equipment requiring stable component supply with full traceability and lifecycle management.
Supply support for MMBZ5235BQ-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-reliability components for automotive, industrial, and computing markets.
This device belongs to the MMBZ52xxB automotive-qualified Zener series, designed specifically for precision voltage reference and transient suppression in harsh-environment electronic control units.
FAQ
What is the maximum reverse voltage (VR) that MMBZ5235BQ-7-F can withstand before breakdown?
The device breaks down at its nominal Zener voltage of 6.8V, with guaranteed minimum VZ = 6.46V and maximum VZ = 7.14V at 20mA test current. It is not rated for sustained reverse voltage above VZ; operation beyond this point initiates controlled conduction, not insulation failure.
Does MMBZ5235BQ-7-F require external current limiting in series with the cathode?
Yes - a series current-limiting resistor is mandatory to restrict IZ within the 20mA test condition and prevent thermal runaway. For example, with a 12V supply and 6.8V VZ, a minimum 260Ω resistor limits current to 20mA; actual value must account for worst-case VZ tolerance and ambient temperature derating.
Is the Q-suffix in MMBZ5235BQ-7-F confirmed to indicate AEC-Q200 qualification?
Yes - per Diodes Incorporated's product definitions and ordering nomenclature, the "Q" suffix denotes automotive qualification per AEC-Q200, including stress testing for temperature cycling, humidity, mechanical shock, and solderability, with manufacturing in IATF 16949-certified facilities.
Can MMBZ5235BQ-7-F be used in place of a 6.2V Zener like MMBZ5234BQ-7-F without circuit redesign?
No - substituting a 6.8V Zener for a 6.2V part alters regulation setpoint by 9.7%, potentially violating downstream IC input voltage tolerances or feedback loop stability margins. Circuit analysis and verification of all bias points, power dissipation, and transient response are required before replacement.
MMBZ5235BQ-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 (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MMBZ5235BQ-7-F FAQ
1.How can I place an order for MMBZ5235BQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5235BQ-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 MMBZ5235BQ-7-F reliable?
The price and inventory of MMBZ5235BQ-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 MMBZ5235BQ-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5235BQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5235BQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5235BQ-7-F?
MMBZ5235BQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5235BQ-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 MMBZ5235BQ-7-F?
For technical support, including MMBZ5235BQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5235BQ-7-F requirements.
6.How does Aetrix verify that MMBZ5235BQ-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5235BQ-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 MMBZ5235BQ-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5235BQ-7-F?
All MMBZ5235BQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5235BQ-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 MMBZ5235BQ-7-F part is unused and in its original packaging.
Return procedure for MMBZ5235BQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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