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onsemi MMBZ5226B
- Part No.:
- MMBZ5226B
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5226B.pdf
- Description:
- DIODE ZENER 3.3V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,777
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Product details
Overview
MMBZ5226B from Fairchild Semiconductor is a 3.3 V, ±5% tolerance Zener diode in SOT-23 package, rated for 350 mW power dissipation, with 28 Ω dynamic impedance at 20 mA test current and 1.6 mA maximum reverse leakage at 1.0 V reverse voltage. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the MMBZ5226B datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy, low dynamic impedance at nominal current, thermal stability across -55°C to +150°C, and compatibility with automated SMT assembly in space-constrained PCB layouts.
Technical Context
The MMBZ5226B operates as a silicon planar epitaxial Zener diode optimized for stable voltage reference and clamping functions in DC bias networks. Its 3.3 V nominal breakdown voltage is specified at 20 mA test current, with 28 Ω dynamic impedance ensuring minimal voltage deviation under load variation.
It exhibits 1.6 mA reverse leakage at VR = 1.0 V and maintains 5% voltage tolerance over temperature (–55°C to +150°C), meeting requirements for industrial-grade signal conditioning and supply rail stabilization where tight regulation and long-term stability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.3 V ±5% at IZ = 20 mA - defines precise clamping threshold for 3.3 V logic rail protection |
| Dynamic Impedance (ZZ) | 28 Ω @ IZ = 20 mA - ensures <±40 mV output shift per ±1 mA current change in regulation loop |
| Power Dissipation (PD) | 350 mW - supports continuous operation in ambient up to +75°C without derating in SOT-23 footprint |
| Reverse Leakage (IR) | 1.6 mA @ VR = 1.0 V - enables reliable turn-off behavior below knee voltage in sensing circuits |
| Forward Voltage (VF) | ≤0.9 V @ IF = 10 mA - allows use as low-drop rectifier or polarity protection diode in dual-role designs |
| Operating Temperature | –55°C to +150°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
SOT-23 plastic surface-mount package with three terminals: anode (Pin 1), cathode (Pin 2), and no-connect (Pin 3). Pin 3 is internally unconnected and must remain floating or grounded per layout guidelines to avoid parasitic coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connects to lower-potential node; forward conduction path when biased >0.9 V |
| Pin 2 | Cathode | Connects to higher-potential node; reverse-biased terminal for Zener breakdown at 3.3 V |
| Pin 3 | No-Connect (NC) | Internally isolated; must not be soldered to trace or plane to prevent mechanical stress or ESD path |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Guarantees 3.135–3.465 V regulation window at 25°C, reducing need for post-calibration in factory-set references |
| Low dynamic impedance (28 Ω) | Minimizes output voltage drift under varying load currents-critical for ADC reference buffers and sensor excitation |
| 350 mW power rating in SOT-23 | Enables direct replacement of larger-package Zeners without board redesign or thermal vias |
| –55°C to +150°C operating range | Validates performance across full automotive AEC-Q101 temperature profile without derating |
Applications
| 3.3 V Logic Rail Protection | Low-Power Sensor Reference |
|---|---|
Use Scenario: Clamp transient spikes on 3.3 V microcontroller I/O lines during ESD events or inductive switching. IC Role / Device Role / Timing Role: Voltage-clamping Zener diode placed between I/O pin and ground to shunt excess energy before IC damage occurs. Use Value: 3.3 V breakdown threshold aligns precisely with I/O rail, while 28 Ω ZZ limits clamping overshoot to <±50 mV during 1 kV HBM discharge. | Use Scenario: Provide stable bias voltage for bridge-based pressure sensors in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Two-terminal voltage reference sourcing <100 µA to sensor Wheatstone bridge, replacing bulkier IC references. Use Value: 350 mW rating allows continuous operation at 20 mA, enabling 3.3 V reference with <0.5% drift over –40°C to +85°C ambient. |
| USB Port Overvoltage Clamp | Industrial Analog Input Protection |
Use Scenario: Protect USB data line receivers from accidental 5 V misconnection or hot-plug surges. IC Role / Device Role / Timing Role: Bidirectional clamp using back-to-back MMBZ5226B devices between D+ and D−, referenced to 3.3 V supply. Use Value: 3.3 V VZ ensures safe clamping below receiver absolute maximum rating (–0.3 V to 3.6 V), with ≤0.9 V VF limiting forward conduction loss. | Use Scenario: Guard 4–20 mA current loop inputs against field-wiring faults and lightning-induced transients. IC Role / Device Role / Timing Role: Zener-based crowbar circuit across input terminals, triggered when common-mode voltage exceeds 3.3 V above ground. Use Value: 1.6 mA IR at 1.0 V ensures negligible loading on high-impedance input amplifiers, preserving measurement accuracy below 10 µA offset error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C3V3 | Same 3.3 V nominal, ±5% tolerance, but 300 mW PD and 30 Ω ZZ @ 5 mA | Lower test current (5 mA vs. 20 mA) shifts operating point; less stable under higher load | Acceptable for low-current biasing where 20 mA regulation is not required |
| MM3Z3V3T1G | 3.3 V ±5%, 200 mW PD, 90 Ω ZZ @ 5 mA, SOD-323 package | Higher impedance and lower power limit reduce clamping effectiveness in surge events | Preferred only when board space is constrained beyond SOT-23 footprint |
Compared with BZX84-C3V3 and MM3Z3V3T1G, the MMBZ5226B delivers superior regulation stability at 20 mA due to its lower ZZ and higher PD, making it optimal for applications demanding consistent 3.3 V clamping under variable load or transient stress.
Availability
MMBZ5226B is available at Aetrix Electronics and suitable for 3.3 V logic protection, low-power sensor biasing, USB interface clamping, and industrial analog input safeguarding requiring stable component supply across extended temperature ranges.
Supply support for MMBZ5226B 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The MMBZ5226B belongs to the MMBZ52xxB Zener diode family designed for high-reliability, low-profile voltage regulation in space-sensitive consumer, computing, and industrial applications.
FAQ
What is the exact Zener voltage tolerance for MMBZ5226B?
The MMBZ5226B has a nominal Zener voltage of 3.3 V with a guaranteed tolerance of ±5% at 25°C and IZ = 20 mA. This means the actual measured VZ falls between 3.135 V and 3.465 V under those conditions, as confirmed in the Fairchild MMBZ5221B–MMBZ5257B datasheet Rev. A2.
Can MMBZ5226B be used in place of a 3.3 V voltage reference IC?
The MMBZ5226B serves as a two-terminal passive voltage reference with 3.3 V breakdown, but lacks active regulation features like temperature compensation or low-noise buffering. It is suitable for non-critical biasing or clamping where ±5% accuracy and moderate thermal drift are acceptable-unlike precision IC references such as REF3333.
What is the maximum reverse leakage current for MMBZ5226B at 1.0 V?
The MMBZ5226B specifies a maximum reverse leakage current (IR) of 1.6 mA when reverse-biased at VR = 1.0 V, per the Absolute Maximum Ratings table in the official datasheet. This value is measured at TA = 25°C and confirms robust blocking behavior well below the Zener knee.
Is MMBZ5226B RoHS compliant and halogen-free?
Yes, the MMBZ5226B manufactured by Fairchild Semiconductor meets RoHS Directive 2011/65/EU requirements and is halogen-free per JEDEC JS709A. Compliance is documented in Fairchild's material declarations and applies to all standard production lots shipped after 2006.
Does MMBZ5226B have a specified thermal resistance (RθJA)?
The MMBZ5226B does not list RθJA explicitly in its datasheet, but its SOT-23 package and 350 mW power rating imply a typical junction-to-ambient thermal resistance of ~350°C/W on standard FR-4 with no copper pour. Derating curves in the datasheet confirm full-rated power is usable up to +75°C ambient.
MMBZ5226B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 28 Ohms
- Current - Reverse Leakage @ Vr:
- 25 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MMBZ5226B FAQ
1.How can I place an order for MMBZ5226B through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5226B 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 MMBZ5226B reliable?
The price and inventory of MMBZ5226B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5226B is usually 5 days.
3.What payment methods are accepted for MMBZ5226B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5226B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5226B?
MMBZ5226B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5226B 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 MMBZ5226B?
For technical support, including MMBZ5226B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5226B requirements.
6.How does Aetrix verify that MMBZ5226B is sourced from the original manufacturer or authorized distributors?
All MMBZ5226B 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 MMBZ5226B meets industry standards.
7.What is the process for return or replacement of MMBZ5226B?
All MMBZ5226B units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5226B, 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 MMBZ5226B part is unused and in its original packaging.
Return procedure for MMBZ5226B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5226B Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZT52C15-7-F
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BZX84C3V3LT1G
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
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