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onsemi MMBZ5227B
- Part No.:
- MMBZ5227B
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5227B.pdf
- Description:
- DIODE ZENER 3.6V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,655
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Product details
Overview
MMBZ5227B from Fairchild Semiconductor is a 3.6 V, ±5% tolerance Zener diode in SOT-23 package, rated for 350 mW power dissipation, with 24 Ω dynamic impedance at 20 mA test current and 1.7 mA reverse leakage current at 2.88 V. It provides precision voltage regulation in low-power biasing and reference circuits.
For engineers reviewing the MMBZ5227B datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, dynamic impedance at specified test current, maximum power rating, reverse leakage at VR, and SOT-23 thermal performance in compact PCB layouts.
Technical Context
The MMBZ5227B operates as a silicon planar Zener diode optimized for stable voltage reference and overvoltage protection in space-constrained designs. Its 3.6 V nominal breakdown voltage is specified at 20 mA test current, with 24 Ω dynamic impedance ensuring tight regulation under varying load conditions.
It features a maximum forward voltage of 0.9 V at 10 mA, enabling bidirectional clamping capability, and maintains operation across –55°C to +150°C junction temperature range with 5% voltage tolerance-critical for industrial sensor biasing and analog front-end stabilization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.6 V ±5% at IZ = 20 mA - defines precise DC reference level for analog circuitry |
| Dynamic Impedance (ZZ) | 24 Ω at IZ = 20 mA - determines regulation stiffness against load transients |
| Power Dissipation (PD) | 350 mW - sets maximum continuous thermal load in SOT-23 footprint |
| Reverse Leakage (IR) | 1.7 µA at VR = 2.88 V - ensures minimal quiescent current in high-impedance bias networks |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - supports dual-role use as clamp and reference diode |
| Operating Temperature | –55°C to +150°C - enables deployment in automotive engine control and industrial PLC modules |
Pinout & Package
SOT-23 surface-mount package with gull-wing leads; standardized 3-pin configuration where Pin 1 is anode, Pin 2 is cathode, and Pin 3 is NC (no connection) per Fairchild's connection diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connects to lower-potential node in reverse-bias regulation or forward conduction path |
| Pin 2 | Cathode | Connects to higher-potential node; voltage reference output point when used in shunt configuration |
| Pin 3 | No Connection | Internally unconnected; must remain floating-no PCB trace or pad required |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Ensures predictable reference accuracy without post-manufacture trimming in cost-sensitive consumer electronics |
| 350 mW power rating in SOT-23 | Delivers usable regulation headroom while maintaining 1.3 mm × 2.9 mm board area efficiency |
| 24 Ω dynamic impedance at 20 mA | Minimizes output voltage shift under ±5 mA load variation in sensor signal conditioning stages |
| 0.9 V max forward voltage at 10 mA | Enables symmetric clamping in AC-coupled protection circuits without external series diodes |
Applications
| Industrial Sensor Biasing | USB Port ESD Clamp |
|---|---|
Use Scenario: Providing stable 3.6 V reference for bridge-based pressure sensors in factory automation transmitters. IC Role / Device Role / Timing Role: Shunt voltage reference establishing excitation voltage for Wheatstone bridge and ADC reference input. Use Value: Tight 5% tolerance and low 24 Ω ZZ maintain bridge linearity within 0.1% full-scale error across temperature. | Use Scenario: Bidirectional transient suppression on USB D+ and D− lines in embedded host controllers. IC Role / Device Role / Timing Role: Low-capacitance Zener clamp limiting voltage swing to ±3.6 V during ESD events. Use Value: 0.9 V forward drop enables fast turn-on during negative transients, complementing TVS array response. |
| Low-Power MCU Reset Circuit | Automotive Cabin Control Panel |
Use Scenario: Generating clean reset threshold for 3.3 V microcontrollers in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Precision voltage monitor triggering POR or brown-out detection via comparator input. Use Value: 1.7 µA leakage at 2.88 V prevents premature discharge of hold-up capacitors during deep sleep modes. | Use Scenario: Regulating 3.6 V supply rail for touch controller ICs in vehicle infotainment displays. IC Role / Device Role / Timing Role: Local shunt regulator stabilizing LDO input under pulsed backlight loading. Use Value: 150°C max junction temperature supports operation near heat-generating display drivers without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C3V6 | Same 3.6 V nominal, ±5% tolerance, but 300 mW rating and 30 Ω ZZ at 5 mA | Higher dynamic impedance reduces regulation precision in high-accuracy references | Select when lower cost and legacy stock availability outweigh tighter ZZ requirements |
| MM3Z3V6T1G | 3.6 V ±5%, 200 mW rating, 15 Ω ZZ at 5 mA, SOD-323 package | Smaller footprint but lower power handling limits use in sustained clamp duty | Prefer for ultra-dense layouts where thermal margin permits reduced PD |
Compared with BZX84-C3V6 and MM3Z3V6T1G, the MMBZ5227B offers superior power handling (350 mW) and lower dynamic impedance (24 Ω at 20 mA), making it optimal for applications requiring both robustness and regulation fidelity in SOT-23 form factor.
Availability
MMBZ5227B is available at Aetrix Electronics and suitable for industrial sensor biasing, USB port ESD clamp, and low-power MCU reset circuits requiring stable component supply and consistent parametric performance across production batches.
Supply support for MMBZ5227B 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 MMBZ5221B–MMBZ5257B family was designed for general-purpose voltage regulation and transient suppression in space-constrained, cost-sensitive applications across consumer, industrial, and computing markets.
FAQ
What is the nominal Zener voltage and tolerance of the MMBZ5227B?
The MMBZ5227B has a nominal Zener voltage of 3.6 V with a tolerance of ±5%, specified at a test current of 20 mA. This value is confirmed in Fairchild's MMBZ5221B–MMBZ5257B datasheet Rev. A2. The MMBZ5227B maintains this voltage stability across its operating temperature range and is intended for precision reference applications where tight regulation is required.
What is the maximum power dissipation rating for the MMBZ5227B?
The MMBZ5227B is rated for a maximum power dissipation of 350 mW at 25°C ambient temperature, as defined in its Absolute Maximum Ratings table. Derating is required above 25°C per the specified thermal resistance curve. This rating directly supports its use in compact SOT-23 layouts where thermal management is constrained, and the MMBZ5227B remains within safe operating limits under typical 20 mA bias conditions.
Does the MMBZ5227B have a specified forward voltage?
Yes, the MMBZ5227B has a maximum forward voltage of 0.9 V at a forward current of 10 mA, consistent across the entire MMBZ5200 series. This parameter is documented in the "VF Forward Voltage" note of the datasheet. The MMBZ5227B leverages this low VF for bidirectional clamping roles, allowing it to conduct efficiently during negative transients without additional diodes.
What is the dynamic impedance of the MMBZ5227B and at what test condition?
The dynamic impedance (ZZ) of the MMBZ5227B is 24 Ω, measured at a Zener test current of 20 mA and ambient temperature of 25°C. This value reflects its ability to maintain stable voltage under small-signal load variations. The MMBZ5227B's 24 Ω ZZ is lower than many competing 3.6 V Zeners tested at lower currents, supporting improved regulation in analog signal chains.
Is the MMBZ5227B suitable for automotive applications?
The MMBZ5227B supports junction temperatures up to +150°C and operates from –55°C to +150°C, meeting extended temperature requirements common in under-hood and cabin electronics. While not AEC-Q200 qualified as a standalone part, the MMBZ5227B is widely deployed in non-safety-critical automotive subsystems such as infotainment power rails and sensor interfaces-provided system-level qualification is completed. Its thermal and parametric stability makes the MMBZ5227B a practical choice where full qualification is not mandated.
MMBZ5227B 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):
- 3.6 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 24 Ohms
- Current - Reverse Leakage @ Vr:
- 15 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
MMBZ5227B FAQ
1.How can I place an order for MMBZ5227B through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5227B 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 MMBZ5227B reliable?
The price and inventory of MMBZ5227B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5227B is usually 5 days.
3.What payment methods are accepted for MMBZ5227B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5227B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5227B?
MMBZ5227B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5227B 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 MMBZ5227B?
For technical support, including MMBZ5227B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5227B requirements.
6.How does Aetrix verify that MMBZ5227B is sourced from the original manufacturer or authorized distributors?
All MMBZ5227B 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 MMBZ5227B meets industry standards.
7.What is the process for return or replacement of MMBZ5227B?
All MMBZ5227B units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5227B, 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 MMBZ5227B part is unused and in its original packaging.
Return procedure for MMBZ5227B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5227B Tags
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