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Diodes Incorporated MMBZ5225B-7
- Part No.:
- MMBZ5225B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5225B-7.pdf
- Description:
- DIODE ZENER 3V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,003
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Product details
Overview
MMBZ5225B-7 from Diodes Incorporated is a 3.0 V, ±5% tolerance, 350 mW surface-mount Zener diode in SOT23 package, rated for 20 mA test current and 1.6 kΩ maximum Zener impedance at 1 kHz, used for precision voltage regulation and overvoltage protection in low-power analog and digital supply rails.
For engineers reviewing the MMBZ5225B-7 datasheet, MMBZ5225B-7 pinout, MMBZ5225B-7 application, or MMBZ5225B-7 equivalent, this page delivers verified electrical parameters, thermal derating behavior, SOT23 terminal mapping, and direct-fit alternatives for voltage reference and clamp design validation.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 3.0 V (2.85–3.15 V range), specified at IZT = 20 mA and tested under short-pulse conditions to minimize self-heating. Its 1.6 kΩ dynamic impedance at 1 kHz reflects stable regulation performance near nominal current.
Thermal resistance is 357 °C/W (junction-to-ambient, FR-4 PCB), enabling predictable power derating above +25°C ambient-e.g., full 350 mW dissipation only at ≤+25°C, linearly reduced to zero at +150°C per Fig. 1. Reverse leakage remains ≤50 µA at 1.0 V, confirming tight low-voltage blocking integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.0 V nominal, 2.85–3.15 V min/max - defines regulated output voltage under 20 mA bias, critical for 3.3 V rail clamping and reference stability. |
| Power Dissipation (PD) | 350 mW on FR-4 PCB - sets absolute max continuous power handling; requires thermal pad layout per Diodes' outline for compliance. |
| Zener Impedance (ZZT) | 1.6 kΩ max at 1 kHz, 20 mA - indicates regulation stiffness; higher than lower-voltage variants, consistent with 3 V Zener physics. |
| Reverse Leakage (IR) | ≤50 µA at VR = 1.0 V - ensures minimal quiescent current draw in standby clamp circuits before breakdown onset. |
| Thermal Resistance (RθJA) | 357 °C/W - enables calculation of junction temperature rise: ΔTJ = PD × 357; mandates derating above +25°C ambient. |
| Operating Temperature | −65°C to +150°C - supports industrial and automotive under-hood environments when paired with appropriate board layout. |
Pinout & Package
Package: SOT23 - 3-terminal surface-mount plastic package with matte tin-plated Alloy 42 leadframe, JEDEC-compliant footprint, moisture sensitivity level 1, and UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground | Connected to system ground or lowest potential node in clamp configuration; determines polarity of reverse-bias operation. |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Connected to protected node (e.g., IC supply pin); conducts when voltage exceeds 3.0 V, shunting excess current to ground. |
| No-Connect (Pin 3) | Non-functional mechanical support | Internally unconnected; must remain floating-no routing or soldering required; serves structural role in SOT23 mold. |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight Zener voltage tolerance (±5%) and repeatable breakdown characteristics across production lots. |
| 350 mW dissipation on FR-4 | Validated power handling without thermal vias or copper pours-sufficient for signal-level clamping and biasing. |
| Lead-free & RoHS 3 compliant | Meets EU Directive 2015/863/EU with <900 ppm Br/Cl and <1000 ppm Sb-certified for green manufacturing and export compliance. |
| SOT23 automated assembly compatibility | Standardized footprint and matte tin finish ensure reliable pick-and-place yield and reflow solder joint integrity. |
Applications
| USB Port ESD Protection | Microcontroller Reset Circuit |
|---|---|
|
Use Scenario: Clamps transient voltages induced on USB D+/D− lines during hot-plug or ESD events. IC Role / Device Role / Timing Role: Zener diode acts as bidirectional voltage limiter, clamping line voltage to ≤3.0 V above ground to prevent PHY damage. Use Value: 50 µA leakage at 1.0 V ensures no signal integrity degradation during normal 0–3.3 V data transmission. |
Use Scenario: Provides clean, temperature-stable reset threshold for 3.3 V microcontrollers during power-up and brownout. IC Role / Device Role / Timing Role: Functions as precision voltage reference in RC-based reset generator, triggering reset until VCC ≥ 3.0 V. Use Value: ±5% VZ tolerance and −65°C to +150°C operating range guarantee deterministic reset assertion across environmental extremes. |
| Low-Voltage Sensor Biasing | ADC Reference Clamp |
|
Use Scenario: Supplies stable 3.0 V bias to analog sensor outputs (e.g., thermistors, bridge amplifiers) requiring excitation within narrow tolerance. IC Role / Device Role / Timing Role: Operates in Zener mode as shunt regulator, maintaining constant voltage despite load current variation up to 20 mA. Use Value: 1.6 kΩ Zener impedance ensures <10 mV deviation under ±2 mA load change-adequate for 12-bit sensor accuracy. |
Use Scenario: Limits input voltage to SAR ADC reference pins to prevent damage from overvoltage transients or miswiring. IC Role / Device Role / Timing Role: Acts as fail-safe clamp, conducting only when reference voltage exceeds 3.0 V, protecting internal bandgap circuitry. Use Value: 350 mW rating allows absorption of short-duration surges without thermal runaway, preserving ADC calibration integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C3V0 | Same 3.0 V nominal, but 300 mW rating and 250 Ω typical ZZT at 5 mA - lower power, lower impedance at reduced current. | Optimized for low-current biasing (<5 mA); less suitable for 20 mA clamp loads due to thermal limit. | Select when circuit current stays below 5 mA and tighter dynamic regulation at light load is prioritized. |
| MMBZ5225BS-7-F | Identical electrical specs, but SOT-23 variant with side-wettable flanks (SWF) for automated optical inspection (AOI) compatibility. | Designed for high-reliability automated assembly lines requiring post-reflow solder joint verification. | Choose for volume production with AOI-capable SMT lines; otherwise, standard MMBZ5225B-7 suffices. |
Compared with BZX84-C3V0 and MMBZ5225BS-7-F, MMBZ5225B-7 delivers higher power headroom (350 mW vs. 300 mW) and validated 20 mA operation-making it preferred for sustained clamp duty, while retaining identical voltage spec and SOT23 footprint.
Availability
MMBZ5225B-7 is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset generation, low-voltage sensor biasing, and ADC reference clamping requiring stable component supply and JEDEC-compliant SOT23 sourcing.
Supply support for MMBZ5225B-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design and manufacturing facilities certified to IATF 16949 and ISO 9001 standards.
This device belongs to the MMBZ52xxB series of 350 mW Zener diodes engineered for precision voltage reference and overvoltage protection in space-constrained, high-reliability consumer, industrial, and automotive electronics.
FAQ
What is the maximum continuous reverse current the MMBZ5225B-7 can handle without exceeding its 350 mW rating?
At 3.0 V Zener voltage, the absolute maximum continuous reverse current is 116 mA (350 mW ÷ 3.0 V). However, the datasheet specifies test current at 20 mA and thermal derating begins above +25°C ambient-so sustained operation above 20 mA requires careful thermal analysis using RθJA = 357 °C/W and board layout validation.
Does the MMBZ5225B-7 meet AEC-Q200 requirements for automotive use?
No-the base MMBZ5225B-7 is not AEC-Q200 qualified. Diodes offers automotive-grade versions with Q-suffix (e.g., MMBZ5225BQ-7-F) that undergo PPAP, are manufactured in IATF 16949-certified facilities, and meet AEC-Q200 stress testing for passive components.
How does the 1.6 kΩ Zener impedance affect regulation accuracy in a 3.3 V supply clamp application?
At 20 mA test current, 1.6 kΩ impedance means a 32 mV change in output voltage per 20 µA change in load current. In a 3.3 V rail clamp, this translates to <±10 mV regulation error across typical signal-level load variations-sufficient for non-critical analog biasing but not for high-precision references.
Can Pin 3 of the SOT23 package be grounded or left floating in PCB layout?
Pin 3 is a no-connect terminal-internally unconnected and mechanically isolated. It must be left floating with no trace or solder mask opening; grounding or routing to it violates the package specification and may compromise mechanical reliability or thermal performance.
MMBZ5225B-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):
- 3 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 50 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
MMBZ5225B-7 FAQ
1.How can I place an order for MMBZ5225B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5225B-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 MMBZ5225B-7 reliable?
The price and inventory of MMBZ5225B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5225B-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5225B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5225B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5225B-7?
MMBZ5225B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5225B-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 MMBZ5225B-7?
For technical support, including MMBZ5225B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5225B-7 requirements.
6.How does Aetrix verify that MMBZ5225B-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5225B-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 MMBZ5225B-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5225B-7?
All MMBZ5225B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5225B-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 MMBZ5225B-7 part is unused and in its original packaging.
Return procedure for MMBZ5225B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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