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Diodes Incorporated MMBZ5231B-7-F
- Part No.:
- MMBZ5231B-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5231B-7-F.pdf
- Description:
- DIODE ZENER 5.1V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:44,828
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Product details
Overview
MMBZ5231B-7-F from Diodes Incorporated is a 5.1 V, 350 mW surface-mount Zener diode in SOT23 package, rated for 20 mA test current with 17 Ω dynamic impedance at 1 kHz and 5.0 µA reverse leakage at 2.0 V. It provides precision voltage regulation in low-power analog circuits, power supply feedback paths, and overvoltage protection clamping.
For engineers reviewing the MMBZ5231B-7-F datasheet, MMBZ5231B-7-F pinout, MMBZ5231B-7-F application, or MMBZ5231B-7-F equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (357 °C/W), JEDEC-compliant reliability, and compatibility with automated SMT assembly on FR-4 PCBs.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its planar die construction ensures consistent Zener characteristics and low noise performance across production lots.
The device is characterized at 25°C with 20 mA test current and exhibits tight voltage distribution (4.85–5.36 V), low dynamic impedance (17 Ω), and controlled reverse leakage (≤5.0 µA at VR = 2.0 V), enabling reliable operation in precision biasing and voltage-clamp functions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1 V nominal, 4.85–5.36 V range at IZT = 20 mA - defines regulated output voltage tolerance for reference and clamp applications |
| Power Dissipation (PD) | 350 mW on FR-4 PCB - sets maximum continuous power handling without heatsinking |
| Zener Impedance (ZZT) | 17 Ω at f = 1 kHz, IZT = 20 mA - determines regulation stiffness and AC ripple rejection capability |
| Reverse Leakage (IR) | ≤5.0 µA at VR = 2.0 V - ensures minimal standby current in high-impedance sensing or bias networks |
| Thermal Resistance (RθJA) | 357 °C/W - quantifies junction-to-ambient temperature rise per watt, critical for thermal design on standard PCB layouts |
| Operating Temperature | −65 to +150 °C - supports industrial and automotive under-hood environments without derating below −40 °C |
Pinout & Package
Package: SOT23 - 3-pin surface-mount plastic package with matte tin-plated Alloy 42 leadframe, UL 94V-0 rated molding compound, and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground | Connected to circuit ground or lower potential node when used in reverse-biased regulation |
| Cathode (Pin 2) | Zener breakdown terminal / voltage reference output | Provides stable 5.1 V relative to anode; carries full Zener current during regulation |
| No Connect (Pin 3) | Internal die attach flag / mechanical support | Not electrically connected; serves as thermal and mechanical anchor in SOT23 mold structure |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable Zener voltage distribution and low parameter drift over time and temperature |
| 350 mW dissipation on FR-4 | Enables direct integration into cost-sensitive consumer and industrial PCBs without auxiliary thermal management |
| Lead-free, RoHS 3 & "Green" compliant | Meets <900 ppm Br/Cl (total ≤1500 ppm) and <1000 ppm Sb - satisfies global environmental compliance mandates |
| JEDEC High Reliability qualification | Validated per AEC-Q stress standards - suitable for mission-critical functions where field failure risk must be minimized |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback or buck-derived DC-DC converters via optocoupler feedback loop. IC Role / Device Role / Timing Role: Provides precise 5.1 V reference to TL431-like shunt regulator IC or directly biases error amplifier input. Use Value: Maintains ±1% output regulation accuracy across line/load/temperature due to tight VZ tolerance and low ZZT. |
Use Scenario: Protecting microcontroller GPIO pins or ADC inputs from transient overvoltage events (e.g., ESD, inductive kick). IC Role / Device Role / Timing Role: Acts as bidirectional clamp: forward-conducts at ~0.9 V, reverse-breaks at 5.1 V to limit voltage excursion. Use Value: Limits pin voltage to safe levels (<5.36 V) while drawing <5 µA leakage in normal operation - preserves signal integrity and power budget. |
| Reference Voltage Source | Current Source Bias |
|
Use Scenario: Generating stable bias for op-amp comparators, sensor excitation circuits, or analog front-end references. IC Role / Device Role / Timing Role: Supplies low-noise, temperature-stable 5.1 V reference to precision analog blocks requiring <10 ppm/°C drift. Use Value: Delivers <17 Ω dynamic impedance and <5 µA leakage - minimizes reference error contribution in 12-bit+ measurement systems. |
Use Scenario: Setting constant current for LED drivers, laser diode bias, or transistor base current in linear regulators. IC Role / Device Role / Timing Role: Forms voltage reference leg in two-resistor current mirror or emitter-degenerated BJT bias network. Use Value: Enables accurate current setting (e.g., IOUT ≈ VZ/RSET) with <±5% tolerance and predictable thermal coefficient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C5V1 (Nexperia) | Same 5.1 V nominal, 300 mW rating, SOT23 package; higher ZZT (40 Ω) and wider VZ tolerance (±6%). | Lower power margin and reduced regulation stiffness - less suitable for precision feedback loops with high ripple rejection requirements. | Select when cost sensitivity outweighs regulation accuracy and thermal performance needs. |
| MMBZ5231BS-7-F (Diodes Inc.) | Same electrical specs but SOT323 package (smaller footprint, higher RθJA = 450 °C/W); identical marking and RoHS compliance. | Higher thermal resistance limits usable power in compact layouts; requires tighter layout control for thermal management. | Choose only when board space is constrained and power dissipation remains ≤250 mW. |
Compared with BZX84-C5V1 and MMBZ5231BS-7-F, the MMBZ5231B-7-F delivers superior regulation stability (17 Ω vs. 40 Ω ZZT) and thermal performance (357 vs. 450 °C/W RθJA), making it optimal for high-accuracy, medium-power voltage reference and clamp roles on standard FR-4 boards.
Availability
MMBZ5231B-7-F is available at Aetrix Electronics and suitable for power supply feedback, overvoltage clamp, and reference voltage source applications requiring stable component supply, JEDEC reliability validation, and RoHS 3 compliance.
Supply support for MMBZ5231B-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, application-optimized components for industrial, computing, and automotive markets.
This device belongs to the MMBZ52xxB series of 350 mW Zener diodes designed specifically for precision voltage regulation and transient protection in space-constrained, high-volume SMT applications.
FAQ
What is the maximum continuous Zener current for MMBZ5231B-7-F at 25°C?
The device is rated for 20 mA test current (IZT) and supports up to 69 mA maximum Zener current at 25°C, calculated from PD = 350 mW and VZ = 5.1 V (IZMAX = PD/VZ). Derating applies above 25°C per the power derating curve in Figure 1.
Is MMBZ5231B-7-F qualified for automotive applications?
No - this part is not AEC-Q200 qualified. Diodes Incorporated offers automotive-grade equivalents with Q-suffix (e.g., MMBZ5231BQ-7-F), which undergo PPAP, IATF 16949 manufacturing, and full AEC-Q200 stress testing. The -7-F variant is intended for industrial and commercial use.
How does the SOT23 package affect thermal performance?
The SOT23 package delivers RθJA = 357 °C/W on FR-4 PCB with recommended pad layout. This value assumes standard copper pour and no thermal vias; adding two 0.3 mm thermal vias under the tab reduces RθJA by ~25%, improving power handling by ~30% at elevated ambient temperatures.
Can MMBZ5231B-7-F replace older MMBZ5231B variants?
Yes - the -7-F suffix denotes tape-and-reel packaging (3,000 units/reel) with no electrical or thermal differences from earlier versions. Pinout, marking, and all specifications match the base MMBZ5231B, ensuring drop-in compatibility in existing designs and manufacturing lines.
MMBZ5231B-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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MMBZ5231B-7-F FAQ
1.How can I place an order for MMBZ5231B-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5231B-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 MMBZ5231B-7-F reliable?
The price and inventory of MMBZ5231B-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 MMBZ5231B-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5231B-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5231B-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5231B-7-F?
MMBZ5231B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5231B-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 MMBZ5231B-7-F?
For technical support, including MMBZ5231B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5231B-7-F requirements.
6.How does Aetrix verify that MMBZ5231B-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5231B-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 MMBZ5231B-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5231B-7-F?
All MMBZ5231B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5231B-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 MMBZ5231B-7-F part is unused and in its original packaging.
Return procedure for MMBZ5231B-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5231B-7-F Tags
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