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Diodes Incorporated MMBZ5226B-7
- Part No.:
- MMBZ5226B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5226B-7.pdf
- Description:
- DIODE ZENER 3.3V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,991
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Product details
Overview
MMBZ5226B-7 from Diodes Incorporated is a 3.3 V, 350 mW surface-mount Zener diode in SOT23 package, rated for 20 mA test current with 28 Ω dynamic impedance at 1 kHz and 25 µA reverse leakage at 1.0 V. It provides precision voltage regulation in low-power analog signal conditioning and power rail clamping circuits.
For engineers reviewing the MMBZ5226B-7 datasheet, MMBZ5226B-7 pinout, MMBZ5226B-7 application, or MMBZ5226B-7 equivalent, key selection criteria include zener voltage tolerance (±3.6%), 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 breakdown characteristics and low leakage across -65°C to +150°C operating range.
The device delivers 3.3 V nominal regulation with ±3.6% tolerance (3.14–3.47 V), 28 Ω zener impedance at 20 mA, and 25 µA reverse leakage at VR = 1.0 V - enabling accurate voltage clamping in low-current bias networks and ESD protection interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.3 V nominal, 3.14–3.47 V range at IZT = 20 mA - defines precise clamping threshold for 3.3 V logic rails. |
| Power Dissipation (PD) | 350 mW on FR-4 PCB - supports continuous operation in space-constrained consumer and industrial PCBs. |
| Zener Impedance (ZZT) | 28 Ω at f = 1 kHz, IZT = 20 mA - ensures minimal voltage deviation under small-signal load transients. |
| Reverse Leakage (IR) | 25 µA at VR = 1.0 V - guarantees low quiescent current in high-impedance reference paths. |
| Thermal Resistance (RθJA) | 357 °C/W - determines junction temperature rise under 350 mW load on standard FR-4 layout. |
| Operating Temperature | -65°C to +150°C - enables use in automotive under-hood and industrial control environments. |
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 | Connected to lower-potential node in reverse-biased Zener configuration; critical for correct polarity in clamping circuits. |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to higher-potential node; carries regulated voltage output during reverse conduction. |
| No Connect (Pin 3) | Internal die attach flag | Electrically isolated; serves mechanical support only - must remain unconnected in PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight VZ tolerance and repeatable breakdown characteristics across production lots. |
| 350 mW dissipation on FR-4 | Validated with industry-standard pad layout - eliminates need for thermal vias in most low-power designs. |
| Lead-free & RoHS 3 compliant | Meets EU Directive 2015/863/EU with <900 ppm Br+Cl and <1000 ppm Sb - suitable for global commercial shipments. |
| JEDEC High Reliability qualified | Complies with AEC-Q stress test standards - supports extended-life applications without derating. |
Applications
| USB Interface Protection | Microcontroller Reset Circuit |
|---|---|
|
Use Scenario: Clamping transient overvoltage on USB D+/D− lines during ESD events or hot-plug insertion. IC Role / Device Role / Timing Role: Zener clamp limiting line voltage to 3.3 V to protect downstream PHY transceivers. Use Value: 25 µA leakage at 1.0 V prevents signal integrity degradation while 28 Ω ZZT ensures fast response to 8 kV HBM pulses. |
Use Scenario: Generating a stable reset threshold for 3.3 V microcontrollers during power-up and brownout conditions. IC Role / Device Role / Timing Role: Precision voltage reference feeding comparator input in discrete reset generator circuits. Use Value: ±3.6% VZ tolerance directly sets reset window accuracy; -65°C to +150°C range supports wide-temperature industrial deployment. |
| Low-Power Sensor Biasing | ADC Reference Stabilization |
|
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) or bridge sensors in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Low-drift voltage source replacing higher-cost shunt references in sub-100 µA bias networks. Use Value: 350 mW rating allows operation up to 105°C ambient without derating; 357 °C/W RθJA enables thermal predictability in sealed enclosures. |
Use Scenario: Stabilizing reference input of 12-bit SAR ADCs in portable medical devices where supply ripple exceeds 1%. IC Role / Device Role / Timing Role: Low-noise voltage clamp reducing VREF variation caused by digital switching noise on shared 3.3 V rail. Use Value: 28 Ω ZZT attenuates high-frequency supply noise above 10 kHz; 20 mA IZT supports typical 50–200 µA reference loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C3V3 | Same 3.3 V nominal, but 300 mW PD, 60 Ω ZZT, and wider VZ tolerance (±5%). | Lower power and higher impedance limit use in noise-sensitive or high-temperature environments. | Select when cost sensitivity outweighs precision and thermal performance requirements. |
| MM3Z3V3 | Same SOT23 package, but 200 mW PD, 95 Ω ZZT, and 50 µA IR at 1.0 V. | Reduced power handling and higher leakage restrict use to ultra-low-current biasing only. | Prefer for space-constrained wearable designs where 200 mW suffices and leakage is non-critical. |
Compared with BZX84-C3V3 and MM3Z3V3, the MMBZ5226B-7 offers superior thermal robustness (350 mW), tighter regulation (±3.6%), and lower dynamic impedance - making it optimal for industrial-grade voltage reference and clamping where long-term stability matters.
Availability
MMBZ5226B-7 is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset circuits, and low-power sensor biasing requiring stable component supply across automotive, industrial, and consumer electronics programs.
Supply support for MMBZ5226B-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 integrated circuits, specializing in high-reliability components for power management, signal integrity, and protection applications.
The MMBZ52xxB series targets cost-sensitive, high-volume applications demanding JEDEC-qualified Zener performance in compact SOT23 packaging - optimized for automated assembly and broad environmental resilience.
FAQ
What is the maximum continuous Zener current for MMBZ5226B-7 at 25°C ambient?
The device supports up to 20 mA Zener test current (IZT) per datasheet, but maximum continuous current depends on thermal design. At 25°C ambient on FR-4, 350 mW power limit permits ~106 mA at 3.3 V - however, derating is required above 25°C using the 357 °C/W RθJA curve.
Is MMBZ5226B-7 suitable for automotive applications?
Standard MMBZ5226B-7 is not AEC-Q200 qualified. For automotive use, Diodes offers the Q-suffix variant (e.g., MMBZ5226BQ-7-F), manufactured in IATF 16949-certified facilities and qualified to AEC-Q200 stress tests - available upon request with PPAP documentation.
How does the SOT23 pinout differ between MMBZ5226B-7 and other Zener families?
MMBZ5226B-7 follows standard SOT23 pinout: Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = NC. This matches BZX84 and MM3Z series - unlike some TO-236 variants where Pin 3 may be cathode. Always verify orientation via top-marking "G1" and schematic symbol polarity.
Can MMBZ5226B-7 replace a 3.3 V TL431-based shunt regulator?
No - TL431 is an adjustable 2.5 V reference with active feedback and 100 mA sink capability; MMBZ5226B-7 is a passive 3.3 V Zener with 20 mA IZT. It can replace TL431 only in fixed-voltage, low-current (<5 mA) clamping roles - not in precision regulation or feedback loops requiring dynamic error correction.
MMBZ5226B-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):
- 3.3 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:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MMBZ5226B-7 FAQ
1.How can I place an order for MMBZ5226B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5226B-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 MMBZ5226B-7 reliable?
The price and inventory of MMBZ5226B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5226B-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5226B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5226B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5226B-7?
MMBZ5226B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5226B-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 MMBZ5226B-7?
For technical support, including MMBZ5226B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5226B-7 requirements.
6.How does Aetrix verify that MMBZ5226B-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5226B-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 MMBZ5226B-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5226B-7?
All MMBZ5226B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5226B-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 MMBZ5226B-7 part is unused and in its original packaging.
Return procedure for MMBZ5226B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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