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Diodes Incorporated MMBZ5231BQ-7-F
- Part No.:
- MMBZ5231BQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5231BQ-7-F.pdf
- Description:
- DIODE ZENER 5.1V 350MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:7,160
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Product details
Overview
MMBZ5231BQ-7-F from Diodes Incorporated is a 5.1V, 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 (4.85–5.36V at 20mA), 17Ω dynamic impedance at test current, and 5µA reverse leakage at 2.0V, enabling stable reference generation in power management and signal conditioning applications.
For engineers reviewing the MMBZ5231BQ-7-F datasheet, MMBZ5231BQ-7-F pinout, MMBZ5231BQ-7-F application, or MMBZ5231BQ-7-F equivalent, key selection criteria include Zener voltage accuracy, thermal derating on FR-4 PCB, SOT23 footprint compatibility, and AEC-Q200 readiness via Q-suffix automotive variants.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified test current of 20mA and maintains regulation across ambient temperatures from –65°C to +150°C. Its planar die construction ensures consistent voltage stability and low temperature coefficient versus diffused-junction alternatives.
Thermal resistance is 357°C/W when mounted on FR-4 PCB with recommended pad layout, supporting continuous operation up to 350mW at 25°C ambient - derating linearly above 25°C per Figure 1. The device uses matte tin–plated Alloy 42 leadframe for solderability and RoHS/"Green" compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1V nominal, 4.85–5.36V range at IZT = 20mA - defines regulated output level in shunt reference designs |
| Power Dissipation (PD) | 350mW on FR-4 PCB - sets maximum continuous power handling without heatsinking |
| Zener Impedance (ZZT) | 17Ω at f = 1kHz, IZT = 20mA - determines AC regulation sensitivity and ripple rejection |
| Reverse Leakage (IR) | 5.0µA max at VR = 2.0V - ensures minimal quiescent current in standby or high-impedance bias networks |
| Operating Temperature | –65°C to +150°C - supports industrial and under-hood automotive environments without derating loss |
| Package | SOT23 - enables automated placement and reflow compatibility with standard 0.95mm pitch PCB footprints |
Pinout & Package
MMBZ5231BQ-7-F is housed in a JEDEC-standard SOT23 plastic package with three terminals. Pin 1 is the anode, Pin 2 is the cathode, and Pin 3 is not connected (NC) - confirmed by Diodes Incorporated's top-view schematic and mechanical drawings in DS18011 Rev. 26-2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential node in reverse-bias configuration; required for proper Zener conduction path |
| Pin 2 | Cathode | Connected to higher-potential node; carries regulated output voltage in shunt regulator topology |
| Pin 3 | No Connection | Internally unconnected; must remain floating - no routing or soldering permitted |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tighter voltage tolerance and improved long-term stability vs. diffused-junction Zeners |
| 350mW dissipation on FR-4 | Eliminates need for external heatsinking in space-constrained consumer and industrial PCBs |
| Matte tin–plated Alloy 42 leadframe | Ensures MIL-STD-202-compliant solderability and eliminates lead-free assembly defects |
| Halogen- and antimony-free "Green" compound | Meets IEC 61249-2-21 requirements for environmentally compliant electronics manufacturing |
Applications
| USB Port Protection | Microcontroller Reset Circuit |
|---|---|
|
Use Scenario: Clamping transient surges on USB 2.0 D+ and D− lines during hot-plug events. IC Role / Device Role / Timing Role: Shunt clamping element that diverts ESD energy to ground before it reaches PHY transceivers. Use Value: 5.1V breakdown threshold aligns with USB 2.0 common-mode voltage limits, preventing latch-up in downstream controllers. |
Use Scenario: Generating a precise reset threshold for 3.3V microcontrollers during brown-out conditions. IC Role / Device Role / Timing Role: Voltage reference in RC-based reset generator circuit feeding POR (power-on reset) logic. Use Value: Tight 5% VZ tolerance ensures reset assertion within 2.8–3.0V supply window, avoiding premature or delayed resets. |
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) |
|
Use Scenario: Providing stable 5.1V reference for 12-bit ADC inputs measuring 4–20mA loop current. IC Role / Device Role / Timing Role: Precision shunt reference replacing bulkier IC-based references in analog front-end stages. Use Value: 17Ω ZZT minimizes reference voltage shift under varying load currents, preserving ADC linearity to ±0.5 LSB. |
Use Scenario: Overvoltage suppression on LIN bus transceiver supply rails exposed to load-dump transients. IC Role / Device Role / Timing Role: Secondary clamp protecting 5V LDO input against 24V spikes in 12V vehicle systems. Use Value: –65°C to +150°C operating range meets AEC-Q200 Grade 1 requirements without derating penalties. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C5V1-7-F | Same 5.1V nominal, but 300mW rating and 60Ω ZZT at 5mA - higher impedance and lower power handling | Limited to low-current biasing; unsuitable for >15mA regulation loads or high-ripple environments | Select when cost sensitivity outweighs regulation precision and thermal margin requirements |
| MMBZ5231BS-7-F | Identical electrical specs, but SOD-323 package - 1.7mm × 1.25mm vs. SOT23's 2.9mm × 1.3mm footprint | Requires PCB redesign for smaller board area; less robust thermal performance due to reduced copper pad area | Prefer for ultra-compact wearables or portable devices where volume and weight are critical constraints |
Compared with BZX84-C5V1-7-F and MMBZ5231BS-7-F, MMBZ5231BQ-7-F offers superior thermal capability (350mW vs. 300mW), lower dynamic impedance (17Ω vs. 60Ω), and automotive-grade process control - making it optimal for industrial and automotive-qualified designs requiring long-term stability.
Availability
MMBZ5231BQ-7-F is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset generation, and industrial sensor signal conditioning requiring stable component supply across production lifecycles.
Supply support for MMBZ5231BQ-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.
This part belongs to Diodes' MMBZ52xxB series of 350mW Zener diodes - engineered for high-reliability voltage reference and protection in automotive, industrial, and consumer applications demanding AEC-Q200 alignment and green material compliance.
FAQ
What is the maximum reverse voltage (VR) at which MMBZ5231BQ-7-F guarantees ≤5µA leakage?
The datasheet specifies 5.0µA maximum reverse leakage current at VR = 2.0V. This value is measured under controlled DC conditions at 25°C ambient and defines the upper bound of off-state current in bias networks. Exceeding 2.0V increases leakage exponentially, approaching breakdown near 4.85V.
Can MMBZ5231BQ-7-F be used in place of a 5V TTL logic-level shifter?
No - this is a Zener diode, not a level-shifting IC or MOSFET-based translator. It lacks bidirectional signal pass-through capability and cannot actively drive logic inputs. Its function is strictly unidirectional voltage clamping or reference generation, not voltage translation between logic families.
Does the "Q" suffix indicate AEC-Q200 qualification?
No - the "Q" suffix in MMBZ5231BQ-7-F denotes tape-and-reel packaging (3,000 units per reel), not automotive qualification. True AEC-Q200 versions carry a separate "-Q" suffix (e.g., MMBZ5231BQ-7-FQ) and require explicit PPAP documentation - confirmed in Diodes' automotive product listing portal.
How does thermal derating affect maximum power at 85°C ambient?
Per Figure 1 in DS18011, power dissipation linearly derates from 350mW at 25°C to zero at 150°C. At 85°C ambient, allowable PD = 350mW × (1 − (85−25)/125) = 210mW. This requires adjusting series resistor values to limit IZ accordingly to avoid junction overheating.
MMBZ5231BQ-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):
- 5.1 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 2 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
MMBZ5231BQ-7-F FAQ
1.How can I place an order for MMBZ5231BQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5231BQ-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 MMBZ5231BQ-7-F reliable?
The price and inventory of MMBZ5231BQ-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 MMBZ5231BQ-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5231BQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5231BQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5231BQ-7-F?
MMBZ5231BQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5231BQ-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 MMBZ5231BQ-7-F?
For technical support, including MMBZ5231BQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5231BQ-7-F requirements.
6.How does Aetrix verify that MMBZ5231BQ-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5231BQ-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 MMBZ5231BQ-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5231BQ-7-F?
All MMBZ5231BQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5231BQ-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 MMBZ5231BQ-7-F part is unused and in its original packaging.
Return procedure for MMBZ5231BQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5231BQ-7-F Tags
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