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onsemi MMBZ5229BLT1
- Part No.:
- MMBZ5229BLT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5229BLT1.pdf
- Description:
- DIODE ZENER 4.3V 225MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:6,685
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Product details
Overview
MMBZ5229BLT1 from onsemi is a 4.3 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board at 25°C, with 22 Ω dynamic impedance at 20 mA test current and 5 μA reverse leakage at 1 V reverse voltage. It serves as a precision voltage reference or overvoltage clamp in low-power portable electronics.
For engineers reviewing the MMBZ5229BLT1 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance, thermal resistance (556 °C/W), ESD rating (>16 kV HBM), cathode-anode polarity marking, and compatibility with automated SMT assembly on high-density PCBs.
Technical Context
This device operates in reverse-bias breakdown mode with a specified Zener voltage of 4.08–4.52 V at 20 mA test current (IZT), exhibiting a temperature coefficient near zero in this voltage range. Its 22 Ω Zener impedance (ZZT) ensures stable regulation under moderate load transients.
The SOT-23 package features a defined pinout: Pin 1 = Anode, Pin 2 = No Connection, Pin 3 = Cathode - confirmed by mechanical drawing Style 8 and electrical characteristics table. Thermal performance is characterized by 556 °C/W junction-to-ambient resistance on FR-5 board.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.08–4.52 V @ IZT = 20 mA - defines clamping threshold with ±5% tolerance for stable reference generation |
| Power Dissipation (PD) | 225 mW @ TA = 25°C on FR-5 board - sets maximum continuous DC power handling in standard PCB layout |
| Zener Impedance (ZZT) | 22 Ω @ IZT = 20 mA - indicates low AC impedance for effective ripple suppression in regulation circuits |
| Reverse Leakage (IR) | 5 μA @ VR = 1 V - confirms minimal standby current draw in undervoltage protection applications |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - enables robust handling in manual assembly and field-replaceable modules |
| Junction Temperature Range | −65°C to +150°C - supports operation in automotive cabin and industrial ambient environments |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting plastic case with corrosion-resistant finish; polarity band denotes cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; required for proper Zener conduction path |
| 2 | No Connection | Floating terminal - must remain unconnected on PCB; no internal bond wire or die attachment |
| 3 | Cathode | Marked with polarity band; connected to higher-potential node to enable controlled reverse breakdown |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating on FR-5 Board | Enables use in space-constrained consumer devices without forced cooling or heatsinking |
| ESD Robustness >16 kV (HBM) | Eliminates need for external ESD protection in handheld product front-end interfaces |
| Pb-Free, Halogen-Free, RoHS Compliant | Meets global environmental compliance requirements for CE, WEEE, and China RoHS marking |
| Optimized for Automated Assembly | Standard SOT-23 footprint and lead coplanarity support high-yield pick-and-place and reflow processes |
Applications
| USB Port Overvoltage Protection | Low-Power Microcontroller Reset Circuit |
|---|---|
Use Scenario: Clamp transient surges on USB VBUS line during hot-plug events or ESD discharge. IC Role / Device Role / Timing Role: Zener clamping diode placed between VBUS and ground to limit voltage excursion to ≤4.52 V. Use Value: Prevents damage to downstream USB PHY ICs rated for max 5.5 V absolute maximum, leveraging MMBZ5229BLT1's fast response and 5 μA leakage at 1 V. |
Use Scenario: Generate clean reset signal for 3.3 V microcontrollers during power-up and brownout conditions. IC Role / Device Role / Timing Role: Voltage reference in RC-based reset generator, where Zener holds threshold at 4.3 V to trigger reset until supply stabilizes. Use Value: Provides tighter voltage tolerance (±5%) than generic 4.7 V Zeners, improving reset accuracy across temperature and process variation. |
| Portable Audio Amplifier Biasing | Smart Sensor Node Voltage Reference |
Use Scenario: Establish stable bias point for Class AB headphone amplifier input stage in battery-powered earbuds. IC Role / Device Role / Timing Role: Shunt regulator providing fixed 4.3 V reference to op-amp bias network. Use Value: Delivers low-noise, low-drift reference with 22 Ω dynamic impedance, minimizing distortion in audio signal path. |
Use Scenario: Supply precise reference voltage to 12-bit ADC in wireless temperature sensor node powered by coin cell. IC Role / Device Role / Timing Role: Low-leakage (5 μA @ 1 V) Zener used in ratiometric reference divider for ADC full-scale calibration. Use Value: Enables <1% reference error over battery discharge curve due to tight 4.3 V ±5% tolerance and minimal self-heating at 225 mW rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C4V3 | Same 4.3 V nominal Zener voltage, but 350 mW rating and higher ZZT (60 Ω); SOT-23 package with identical pinout (Anode-NC-Cathode) | Higher power handling suits higher-current regulation; less suitable for ultra-low-leakage sensor references | Select BZX84-C4V3 when >225 mW dissipation or higher surge energy absorption is required |
| MMBZ5229BS | Same electrical specs, but in SOD-123 package (larger, 2.9 × 1.8 mm); no NC pin - dual-terminal construction | Lower thermal resistance (417 °C/W on alumina) but incompatible with fine-pitch SMT lines optimized for SOT-23 | Choose MMBZ5229BS only if board layout allows larger footprint and requires improved thermal performance on ceramic substrates |
Compared with BZX84-C4V3 and MMBZ5229BS, the MMBZ5229BLT1 offers optimal balance of low-profile SOT-23 packaging, 225 mW FR-5 rating, and 22 Ω Zener impedance - making it preferred for high-density portable designs where board space and ESD robustness are critical.
Availability
MMBZ5229BLT1 is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset circuits, portable audio biasing, and smart sensor reference applications requiring stable component supply and RoHS-compliant sourcing.
Supply support for MMBZ5229BLT1 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
onsemi (Semiconductor Components Industries, LLC) is a global supplier of energy-efficient semiconductor solutions, headquartered in Phoenix, Arizona, serving automotive, industrial, cloud, medical, and IoT markets.
The MMBZ52xxBLT1G series was designed specifically for compact, high-reliability voltage regulation in space-constrained portable electronics - emphasizing low leakage, high ESD immunity, and compatibility with automated SMT assembly.
FAQ
What is the exact Zener voltage tolerance of MMBZ5229BLT1?
The MMBZ5229BLT1 has a guaranteed Zener voltage range of 4.08 V to 4.52 V at 20 mA test current (IZT), corresponding to a ±5% tolerance around the nominal 4.3 V value. This specification is verified per onsemi's Electrical Characteristics table on page 3 of the July 2024 Rev. 16 datasheet and applies under standard 25°C ambient conditions.
Does MMBZ5229BLT1 have a functional third pin?
No, MMBZ5229BLT1 has only two active terminals: Pin 1 is the anode and Pin 3 is the cathode; Pin 2 is explicitly designated "No Connection" in the mechanical drawing (Style 8) and electrical characteristics table. It is not bonded internally and must remain unconnected on the PCB to ensure correct Zener operation.
What is the maximum reverse leakage current for MMBZ5229BLT1 at 1 V?
The maximum reverse leakage current for MMBZ5229BLT1 is 5 μA at VR = 1 V, as specified in the Electrical Characteristics table on page 3 of the datasheet. This low leakage supports energy-sensitive applications such as coin-cell-powered sensor nodes where standby current must be minimized.
Is MMBZ5229BLT1 suitable for automotive applications?
The standard MMBZ5229BLT1 is not AEC-Q101 qualified; however, its automotive-grade counterpart SZMMBZ5229BLT1G is explicitly listed as AEC-Q101 qualified and PPAP capable. For automotive use, designers must specify the SZ-prefix variant - MMBZ5229BLT1 itself is intended for commercial and industrial portable electronics.
What is the thermal resistance of MMBZ5229BLT1 on FR-5 board?
The junction-to-ambient thermal resistance (RJA) of MMBZ5229BLT1 is 556 °C/W when mounted on FR-5 board, as stated in the Maximum Ratings table on page 1 of the datasheet. This value assumes standard 1.0 × 0.75 × 0.62 inch board dimensions and defines the temperature rise per unit power dissipated at the die.
MMBZ5229BLT1 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):
- 4.3 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 22 Ohms
- Current - Reverse Leakage @ Vr:
- 5 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 (TO-236)
MMBZ5229BLT1 FAQ
1.How can I place an order for MMBZ5229BLT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5229BLT1 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 MMBZ5229BLT1 reliable?
The price and inventory of MMBZ5229BLT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5229BLT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5229BLT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5229BLT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5229BLT1?
MMBZ5229BLT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5229BLT1 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 MMBZ5229BLT1?
For technical support, including MMBZ5229BLT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5229BLT1 requirements.
6.How does Aetrix verify that MMBZ5229BLT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5229BLT1 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 MMBZ5229BLT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5229BLT1?
All MMBZ5229BLT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5229BLT1, 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 MMBZ5229BLT1 part is unused and in its original packaging.
Return procedure for MMBZ5229BLT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5229BLT1 Tags
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