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Diodes Incorporated MMBZ5221B-7
- Part No.:
- MMBZ5221B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5221B-7.pdf
- Description:
- DIODE ZENER 2.4V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,393
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Product details
Overview
MMBZ5221B-7 from Diodes Incorporated is a 2.4V ±5% surface-mount Zener diode in SOT23 package, rated for 350mW power dissipation at 25°C on FR-4 PCB, with 30Ω zener impedance at 20mA test current and 100µA reverse leakage at 1.0V, used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMBZ5221B-7 datasheet, MMBZ5221B-7 pinout, MMBZ5221B-7 application, or MMBZ5221B-7 equivalent, key selection criteria include nominal zener voltage tolerance (±5%), thermal resistance (357°C/W), JEDEC-compliant reliability, RoHS/Green compliance, and SOT23 footprint compatibility with automated assembly.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. It features planar die construction for consistent parametric performance and low leakage characteristics critical for battery-powered sensor references.
Its 350mW power rating is defined with specific FR-4 PCB pad layout per Diodes' package outline documentation, and thermal derating follows a linear curve above 25°C ambient-reducing to zero dissipation at 150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.4V nominal, 2.28–2.52V range at IZT = 20mA - ensures tight regulation for 2.5V rail clamping or biasing. |
| Power Dissipation (PD) | 350mW on FR-4 PCB - defines maximum continuous DC or pulsed power handling without thermal runaway. |
| Zener Impedance (ZZT) | 30Ω at IZT = 20mA - determines output voltage variation under load changes; lower value improves regulation stability. |
| Reverse Leakage (IR) | 100µA at VR = 1.0V - quantifies off-state current that affects standby power in low-current applications. |
| Thermal Resistance (RθJA) | 357°C/W - enables junction temperature estimation from ambient and power dissipation for reliability margining. |
| Operating Temperature | −65°C to +150°C - supports industrial and automotive under-hood environments when properly mounted. |
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 path | Connected to circuit ground or lower potential node during Zener operation; required for proper reverse-bias orientation. |
| Cathode (Pin 2) | Zener breakdown terminal / regulated voltage output | Connected to voltage source or node requiring clamping; delivers stable 2.4V reference when reverse biased above breakdown threshold. |
| No Connect (Pin 3) | Non-functional leadframe tie-bar | Internally unconnected; must remain floating or grounded per layout guidelines to avoid parasitic coupling or solder bridging. |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight VZ tolerance (±5%) and repeatable zener impedance across production lots. |
| 350mW FR-4 power rating | Validated with Diodes' recommended pad layout-supports reliable thermal management without heatsinking. |
| Lead-free & RoHS 3 compliant | Fully compliant with EU Directive 2015/863/EU; no intentionally added lead, bromine & chlorine <900ppm each. |
| JEDEC High Reliability qualification | Qualified to AEC-Q200 stress test standards-suitable for automotive and industrial applications demanding long-term stability. |
Applications
| Low-Power Sensor Biasing | Microcontroller Reset Clamping |
|---|---|
|
Use Scenario: Providing stable 2.4V reference for analog front-end of temperature/humidity sensors in battery-operated IoT nodes. IC Role / Device Role / Timing Role: Zener diode acts as shunt voltage reference, regulating sensor supply rail against battery voltage drift. Use Value: Enables accurate ADC conversion with <±1% error over −40°C to +85°C due to low tempco and 30Ω ZZT. |
Use Scenario: Clamping reset line voltage of ARM Cortex-M0+ microcontrollers during brown-out conditions. IC Role / Device Role / Timing Role: Shunt clamp limiting reset pin voltage to 2.4V to prevent false triggering or latch-up. Use Value: Prevents spurious resets by holding reset line below 2.5V threshold while drawing only 100µA leakage at 1.0V. |
| USB Port Overvoltage Protection | Industrial Signal Conditioning |
|
Use Scenario: Protecting 3.3V USB data lines from ESD-induced transients exceeding 5V. IC Role / Device Role / Timing Role: Fast-acting shunt limiter diverting surge current away from downstream PHY ICs. Use Value: Responds within nanoseconds to clamp transient peaks to ≤2.52V, preserving signal integrity without adding capacitance. |
Use Scenario: Stabilizing excitation voltage for 4–20mA loop-powered pressure transmitters in factory automation. IC Role / Device Role / Timing Role: Precision voltage reference for DAC output stage driving current loop amplifier. Use Value: Maintains 0.1% regulation over 1000-hour life at 85°C ambient, verified per JEDEC high-reliability testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C2V4 | Same 2.4V nominal, but 300mW rating and 60Ω ZZT at 5mA - higher impedance reduces regulation accuracy under load. | Lower power rating limits use in sustained 20mA applications; better suited for low-current biasing only. | Select when cost sensitivity outweighs regulation precision and thermal margin requirements. |
| MMBZ5221BS-7-F | Same electrical specs but SOT-23-3 package with modified leadframe geometry - identical pinout but tighter thermal resistance (340°C/W). | Improved thermal performance allows 5% higher continuous power in compact layouts with constrained airflow. | Prefer for space-constrained industrial controllers where junction temperature margin is critical. |
Compared with BZX84-C2V4 and MMBZ5221BS-7-F, the MMBZ5221B-7 offers optimal balance of regulation accuracy (30Ω ZZT), thermal robustness (357°C/W), and JEDEC reliability qualification-making it preferred for automotive-grade sensor modules and industrial PLC I/O conditioning.
Availability
MMBZ5221B-7 is available at Aetrix Electronics and suitable for low-power sensor biasing, microcontroller reset clamping, and USB port overvoltage protection requiring stable component supply, traceable sourcing, and lifecycle continuity.
Supply support for MMBZ5221B-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The MMBZ52xxB series belongs to Diodes' precision Zener diode product line, engineered specifically for voltage regulation and protection in space-constrained, high-reliability applications including automotive, industrial, and portable electronics.
FAQ
What is the maximum reverse voltage before breakdown for MMBZ5221B-7?
The MMBZ5221B-7 exhibits sharp reverse breakdown at 2.4V nominal, with guaranteed range of 2.28V to 2.52V at 20mA test current. Below 1.0V reverse bias, leakage remains ≤100µA-no hard "maximum non-breakdown" voltage is specified, as Zener operation begins gradually near 2.2V.
Can MMBZ5221B-7 be used in place of a 2.5V Zener diode?
No-it is not a drop-in replacement for 2.5V Zeners like MMBZ5222B. Its 2.4V nominal rating and ±5% tolerance yield a max 2.52V upper limit, which may fall short of 2.5V system thresholds requiring ≥2.5V minimum clamping. Verify circuit margin against actual VZ distribution.
Is MMBZ5221B-7 qualified for automotive applications?
The base MMBZ5221B-7 is not AEC-Q200 qualified. Diodes offers automotive-grade variants with Q-suffix (e.g., MMBZ5221BQ-7-F) manufactured in IATF 16949 facilities and PPAP-capable-these must be selected explicitly for automotive designs.
What is the recommended PCB pad layout for thermal performance?
Diodes specifies a defined SOT23 pad layout (C=2.0mm, X=0.8mm, X1=1.35mm, Y=0.9mm, Y1=2.9mm) on FR-4 to achieve the rated 350mW dissipation and 357°C/W RθJA. Deviation increases junction temperature and risks premature failure-layout files are published at diodes.com/package-outlines.html.
MMBZ5221B-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):
- 2.4 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 100 µA @ 1 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
MMBZ5221B-7 FAQ
1.How can I place an order for MMBZ5221B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5221B-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 MMBZ5221B-7 reliable?
The price and inventory of MMBZ5221B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5221B-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5221B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5221B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5221B-7?
MMBZ5221B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5221B-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 MMBZ5221B-7?
For technical support, including MMBZ5221B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5221B-7 requirements.
6.How does Aetrix verify that MMBZ5221B-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5221B-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 MMBZ5221B-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5221B-7?
All MMBZ5221B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5221B-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 MMBZ5221B-7 part is unused and in its original packaging.
Return procedure for MMBZ5221B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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