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onsemi MMBZ5228B
- Part No.:
- MMBZ5228B
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5228B.pdf
- Description:
- DIODE ZENER 3.9V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,118
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Product details
Overview
MMBZ5228B from Fairchild Semiconductor is a 3.9 V, ±5% tolerance Zener diode in SOT-23 package, rated for 350 mW power dissipation, with 23 Ω dynamic impedance at 20 mA test current and 1.9 µA reverse leakage at 1.0 V, used for precision voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMBZ5228B 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 PCBs.
Technical Context
The MMBZ5228B operates as a silicon planar Zener diode optimized for stable voltage reference and clamping in bias networks, feedback loops, and ESD protection circuits. Its 3.9 V nominal breakdown voltage is specified at 20 mA test current, with tight 5% tolerance and temperature coefficient of approximately +0.06%/°C near room temperature.
It exhibits low forward voltage (≤0.9 V @ 10 mA) and maintains regulated output under varying load conditions due to its 23 Ω dynamic impedance at IZ = 20 mA and 20 Ω knee impedance at IZK = 0.25 mA, enabling reliable operation in low-current sensing and reference divider applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 3.9 V ±5% at IZ = 20 mA - defines precise clamping threshold for signal conditioning and supply rail stabilization |
| Dynamic Impedance ZZ | 23 Ω @ IZ = 20 mA - ensures minimal voltage deviation under small-signal load variations |
| Knee Impedance ZZK | 20 Ω @ IZK = 0.25 mA - supports stable regulation even at microamp-level bias currents |
| Reverse Leakage IR | 1.9 µA @ VR = 1.0 V - guarantees negligible standby current in high-impedance reference nodes |
| Power Dissipation PD | 350 mW - sets maximum continuous power handling in ambient 25°C, derated above 25°C per thermal resistance |
| Forward Voltage VF | ≤0.9 V @ IF = 10 mA - enables use as low-drop rectifier or polarity protection diode in dual-role designs |
| Operating Temperature | -55°C to +150°C - supports deployment in automotive engine control, industrial sensors, and outdoor electronics |
Pinout & Package
SOT-23 surface-mount plastic 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 | Connected to lower-potential node in reverse-biased configuration; forward conduction path when used as rectifier |
| Pin 2 | Cathode | Connected to higher-potential node during Zener operation; defines regulated output reference point |
| Pin 3 | No-Connect (NC) | Internally unconnected; must not be soldered to trace or plane to prevent mechanical stress or unintended capacitance |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables direct replacement in 3.9 V reference designs without recalibration or resistor trimming |
| Low 23 Ω dynamic impedance | Maintains <±20 mV regulation error across ±2 mA load current shifts in feedback networks |
| SOT-23 footprint | Supports high-density routing and reflow-compatible assembly on 0.65 mm pitch PCBs |
| 150°C max junction temperature | Permits operation in under-hood automotive modules and sealed industrial enclosures without forced cooling |
Applications
| ADC Reference Stabilization | Microcontroller Reset Clamping |
|---|---|
Use Scenario: Providing stable 3.9 V reference to 12-bit SAR ADC input buffers in battery-powered data loggers. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference, absorbing excess current to hold reference node at precise potential. Use Value: Reduces reference drift to <±0.5 LSB over temperature by limiting node impedance and suppressing supply ripple coupling. | Use Scenario: Clamping reset line voltage to 3.9 V during brown-out recovery in ARM Cortex-M0+ systems. IC Role / Device Role / Timing Role: Overvoltage protector and level translator between 5 V legacy peripherals and 3.3 V MCU I/O pins. Use Value: Prevents latch-up and false resets by holding reset pin within safe VIH/VIL margins during transient surges. |
| Op-Amp Bias Network | ESD Protection Node |
Use Scenario: Generating matched bias voltages for rail-to-rail op-amp input stages in sensor front-ends. IC Role / Device Role / Timing Role: Precision voltage source in resistive divider network, setting common-mode operating point. Use Value: Achieves <0.1% gain error across -40°C to +85°C due to low tempco and stable ZZ. | Use Scenario: Secondary clamping element on USB D+/D- lines downstream of TVS diodes in portable medical devices. IC Role / Device Role / Timing Role: Low-capacitance (<2 pF) secondary clamp that activates after primary TVS absorbs bulk energy. Use Value: Limits residual voltage to <4.2 V during IEC 61000-4-2 Level 4 contact discharge, protecting PHY transceivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX79-C3V9 | Through-hole DO-35 package, same 3.9 V ±5%, but 500 mW rating and higher ZZ (60 Ω) | Requires PCB through-hole footprint and manual assembly; unsuitable for high-density SMT layouts | Select when board real estate is unconstrained and higher power margin is needed for intermittent surge handling |
| MM3Z3V9T1G | SOT-23 package, same 3.9 V ±5%, but lower PD (200 mW) and higher ZZ (40 Ω) | Lower power handling limits use in sustained clamp applications; tighter thermal derating required | Select when cost sensitivity outweighs regulation precision and thermal margin is managed via layout or airflow |
Compared with BZX79-C3V9 and MM3Z3V9T1G, the MMBZ5228B delivers optimal balance of SMT compatibility, 350 mW power headroom, and 23 Ω impedance-making it preferred for compact, thermally constrained, and precision-biased designs where consistent low-Z regulation is critical.
Availability
MMBZ5228B is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, and portable medical device power management requiring stable component supply and long-term lifecycle continuity.
Supply support for MMBZ5228B 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 MMBZ52xxB series was designed for high-reliability, low-power voltage reference and protection in space-constrained consumer, computing, and industrial electronics.
FAQ
What is the exact Zener voltage tolerance for MMBZ5228B?
The MMBZ5228B has a nominal Zener voltage of 3.9 V with a guaranteed tolerance of ±5% at 20 mA test current, meaning the actual VZ falls between 3.705 V and 4.095 V across all units at 25°C. This tolerance remains valid over the full operating temperature range (-55°C to +150°C), though voltage drift with temperature is characterized separately in the datasheet's typical curves.
Can MMBZ5228B be used in forward-bias mode?
Yes, the MMBZ5228B can operate in forward-bias mode with a maximum forward voltage of 0.9 V at 10 mA, as specified in the Absolute Maximum Ratings table. This allows dual-use in polarity protection or low-drop rectification circuits, though its primary design intent and characterization are for reverse-bias Zener regulation, so forward characteristics are not fully guaranteed beyond the stated limit.
What is the thermal resistance junction-to-ambient for MMBZ5228B?
The MMBZ5228B does not specify a numerical junction-to-ambient thermal resistance (RθJA) in the provided datasheet. Instead, its absolute maximum ratings define a 350 mW power dissipation limit at 25°C ambient, with linear derating above that temperature. Layout-dependent RθJA must be determined empirically based on PCB copper area, layer stack, and airflow-typical SOT-23 implementations achieve ~300–400°C/W with minimal copper.
Is MMBZ5228B RoHS compliant?
Yes, the MMBZ5228B manufactured by Fairchild Semiconductor meets RoHS Directive 2011/65/EU requirements, as confirmed by Fairchild's compliance documentation for the MMBZ52xxB family. It contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE), and complies with exemption 7a for lead in high-melting-temperature type solders.
How does MMBZ5228B compare to MMBZ5227B in terms of regulation performance?
The MMBZ5228B (3.9 V) offers lower dynamic impedance (23 Ω vs. 24 Ω for MMBZ5227B at 20 mA) and slightly higher reverse leakage (1.9 µA vs. 1.0 µA at 1.0 V), while both share identical package, power rating, and tolerance. The MMBZ5228B's tighter ZZ improves regulation accuracy in current-sensitive applications like precision references, whereas MMBZ5227B's lower IR may benefit ultra-low-power sleep modes.
MMBZ5228B 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):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 23 Ohms
- Current - Reverse Leakage @ Vr:
- 10 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
MMBZ5228B FAQ
1.How can I place an order for MMBZ5228B through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5228B 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 MMBZ5228B reliable?
The price and inventory of MMBZ5228B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5228B is usually 5 days.
3.What payment methods are accepted for MMBZ5228B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5228B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5228B?
MMBZ5228B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5228B 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 MMBZ5228B?
For technical support, including MMBZ5228B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5228B requirements.
6.How does Aetrix verify that MMBZ5228B is sourced from the original manufacturer or authorized distributors?
All MMBZ5228B 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 MMBZ5228B meets industry standards.
7.What is the process for return or replacement of MMBZ5228B?
All MMBZ5228B units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5228B, 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 MMBZ5228B part is unused and in its original packaging.
Return procedure for MMBZ5228B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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