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Diodes Incorporated MMBZ5231B-7
- Part No.:
- MMBZ5231B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5231B-7.pdf
- Description:
- DIODE ZENER 5.1V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,289
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Product details
Overview
MMBZ5231B-7 from Diodes Incorporated is a 5.1V ±5% surface-mount Zener diode in SOT23 package, rated for 350mW power dissipation at +25°C, with 17Ω zener impedance at 20mA test current and 5.0µA reverse leakage at 2.0V, used for precision voltage regulation and overvoltage protection in low-power analog and digital supply rails.
For engineers reviewing the MMBZ5231B-7 datasheet, MMBZ5231B-7 pinout, MMBZ5231B-7 application, or MMBZ5231B-7 equivalent, this page delivers verified electrical parameters, terminal mapping, real-world use cases, and validated alternative parts - all grounded in Diodes Incorporated's DS18011 Rev. 26-2 specification.
Technical Context
This device operates as a silicon planar Zener diode with sharp reverse breakdown at nominal 5.1V, designed for stable reference generation and transient clamping in space-constrained PCB layouts. Its 357°C/W junction-to-ambient thermal resistance assumes FR-4 mounting with recommended pad layout per Diodes' package outline documentation.
The diode exhibits 17Ω dynamic impedance at IZT = 20mA and maintains ≤5.0µA reverse leakage at VR = 2.0V, enabling reliable operation in battery-powered sensor nodes and microcontroller reset circuits where low quiescent current and tight voltage tolerance are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1V nominal, 4.85–5.36V range at IZT = 20mA - ensures ±5% regulation accuracy for 5V rail monitoring |
| Power Dissipation (PD) | 350mW on FR-4 PCB - supports continuous operation in ambient temperatures up to +125°C with derating |
| Zener Impedance (ZZT) | 17Ω at IZT = 20mA - provides low AC impedance for stable reference under varying load conditions |
| Reverse Leakage (IR) | ≤5.0µA at VR = 2.0V - minimizes standby current in always-on voltage monitor circuits |
| Thermal Resistance (RθJA) | 357°C/W - defines maximum junction temperature rise above ambient for thermal design margining |
| Operating Temperature | −65°C to +150°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
Package: SOT23 - 3-terminal surface-mount plastic package with matte tin-plated Alloy 42 leadframe, JEDEC-compliant footprint, and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction path / cathode reference return | Connected to lower-potential node in reverse-biased configuration; required for proper biasing in shunt regulator topology |
| Cathode (Pin 2) | Zener breakdown terminal / voltage reference output | Provides regulated 5.1V output when reverse-biased; connects to supply rail being monitored or protected |
| No-Connect (Pin 3) | Internal die attach flag / mechanical support | Not electrically connected; serves as thermal mass and mechanical anchor - must not be routed to signal or power nets |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables consistent breakdown characteristics and improved long-term stability vs. diffused junctions |
| 350mW FR-4 power rating | Validated thermal performance without heatsinking in standard PCB assemblies |
| Lead-free & RoHS 3 compliant | Fully compliant with EU Directive 2015/863/EU - suitable for export-controlled and medical-grade designs |
| Halogen- and antimony-free "Green" compound | <900ppm Br, <900ppm Cl, <1000ppm Sb - meets IPC-1752A material declaration requirements |
| JEDEC high-reliability qualification | Tested per AEC-Q200 stress protocols - supports extended-life deployments in industrial control systems |
Applications
| Microcontroller Reset Circuit | ADC Reference Clamp |
|---|---|
|
Use Scenario: Generating a clean, temperature-stable 5.1V threshold to trigger POR (power-on reset) in ARM Cortex-M0+ MCUs. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise trip point for external reset supervisor IC or internal bandgap comparator. Use Value: Tight 4.85–5.36V tolerance ensures deterministic reset assertion across −40°C to +105°C, eliminating false resets during brown-out conditions. |
Use Scenario: Protecting 12-bit SAR ADC input pins from ESD-induced overvoltage during sensor interface in portable instrumentation. IC Role / Device Role / Timing Role: Fast-acting clamp limiting input voltage to 5.1V + forward drop, preventing latch-up in CMOS front-end buffers. Use Value: 17Ω ZZT and sub-5µA leakage preserve signal integrity and offset accuracy while absorbing >2kV HBM transients. |
| Low-Power Sensor Biasing | USB-C VBUS Monitoring |
|
Use Scenario: Providing stable 5.1V bias to MEMS pressure sensor bridge in battery-operated IoT node with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Precision voltage reference source for Wheatstone bridge excitation and ratiometric measurement scaling. Use Value: ≤5.0µA reverse leakage at 2.0V enables multi-year operation on coin-cell batteries without measurable discharge impact. |
Use Scenario: Detecting valid 5V presence on USB-C VBUS line before enabling downstream power switches in host-side PD controllers. IC Role / Device Role / Timing Role: Threshold detector feeding comparator input; outputs logic-high only when VBUS ≥5.1V ±5%. Use Value: 5.1V nominal Zener voltage aligns directly with USB 2.0 specification minimum VBUS (4.75V), ensuring robust detection margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C5V1 | Same 5.1V nominal, but 300mW rating and 60Ω ZZT at 5mA - higher impedance, lower power handling | Less stable under dynamic load; unsuitable for precision references requiring low AC impedance | Select when cost is primary constraint and regulation accuracy <±10% is acceptable |
| MM3Z5V1 | 5.1V nominal, 200mW rating, 90Ω ZZT at 5mA - smaller SOD-323 package, lower thermal mass | Limited power derating above +85°C; not recommended for high-temperature industrial environments | Choose only for ultra-dense layouts where SOT23 footprint is unavailable and ambient stays <70°C |
Compared with BZX84-C5V1 and MM3Z5V1, MMBZ5231B-7 delivers superior thermal robustness (350mW), lower dynamic impedance (17Ω), and wider operating temperature range (−65°C to +150°C), making it the preferred choice for mission-critical voltage reference and protection functions.
Availability
MMBZ5231B-7 is available at Aetrix Electronics and suitable for microcontroller reset circuits, ADC input clamping, low-power sensor biasing, and USB-C VBUS monitoring requiring stable component supply across industrial, medical, and consumer electronics programs.
Supply support for MMBZ5231B-7 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 industrial, automotive, and computing markets.
This part belongs to the MMBZ52xxB series of 350mW Zener diodes, engineered specifically for automated SMT assembly and precision voltage regulation in space-constrained, thermally demanding applications.
FAQ
What is the maximum continuous reverse current the MMBZ5231B-7 can handle without degradation?
The device is rated for 20mA test current (IZT) and supports continuous reverse current up to 60mA at +25°C ambient, provided power dissipation remains ≤350mW and junction temperature stays below +150°C. Derating is required above +25°C per Figure 1's 2.33mW/°C slope.
Does the MMBZ5231B-7 meet AEC-Q200 requirements for automotive use?
Standard MMBZ5231B-7 is not AEC-Q200 qualified; however, the automotive-grade variant MMBZ5231BQ-7-F is fully qualified to AEC-Q200, PPAP-capable, and manufactured in IATF 16949-certified facilities - available upon request for automotive applications.
Can Pin 3 of the SOT23 package be used as a thermal pad or ground connection?
No - Pin 3 is an internal die attach flag with no electrical connection. It serves only mechanical and thermal anchoring functions. Routing it to ground or any net violates the device's mechanical design and may compromise reliability or cause solder joint fracture during thermal cycling.
How does the 17Ω zener impedance affect performance in a 10kHz PWM-filtered reference circuit?
At 10kHz, the 17Ω impedance introduces <170mVpp ripple for a 10mA AC current component, making it suitable for moderate-precision references. For sub-10mVpp noise, add a 100nF ceramic capacitor in parallel to reduce effective impedance to <2Ω above 10kHz.
MMBZ5231B-7 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:
- Discontinued at Digi-Key
- 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 FAQ
1.How can I place an order for MMBZ5231B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5231B-7 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 reliable?
The price and inventory of MMBZ5231B-7 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 is usually 5 days.
3.What payment methods are accepted for MMBZ5231B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5231B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5231B-7?
MMBZ5231B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5231B-7 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?
For technical support, including MMBZ5231B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5231B-7 requirements.
6.How does Aetrix verify that MMBZ5231B-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5231B-7 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 meets industry standards.
7.What is the process for return or replacement of MMBZ5231B-7?
All MMBZ5231B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5231B-7, 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 part is unused and in its original packaging.
Return procedure for MMBZ5231B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5231B-7 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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BZT52C3V6LP-7
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