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onsemi MMBZ5231ELT3G
- Part No.:
- MMBZ5231ELT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5231ELT3G.pdf
- Description:
- DIODE ZENER 5.1V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,531
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Product details
Overview
MMBZ5231ELT3G from onsemi is a 5.1 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation at 25°C, with 17 Ω dynamic impedance at 20 mA test current and 0.25 μA leakage at 2 V reverse bias. It serves as a precision voltage reference or overvoltage clamp in low-power portable electronics.
For engineers reviewing the MMBZ5231ELT3G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal resistance (556 °C/W on FR-5), ESD robustness (>16 kV HBM), and SOT-23 footprint compatibility in space-constrained designs.
Technical Context
This device operates in reverse breakdown mode to maintain stable voltage across its cathode-anode terminals under varying load or supply conditions. Its 5.1 V nominal Zener voltage is specified at 20 mA test current (IZT) with ±5% tolerance, and exhibits a temperature coefficient near zero in this range.
The SOT-23 package features Pin 1 (Anode), Pin 2 (No Connection), and Pin 3 (Cathode), enabling unidirectional clamping or regulation without parasitic conduction paths. Thermal performance is defined for FR-5 board mounting, with derating starting above 25°C at 1.8 mW/°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.84–5.36 V @ IZT = 20 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation (PD) | 225 mW @ TA = 25°C on FR-5 board - sets maximum continuous DC power handling before thermal derating |
| Zener Impedance (ZZT) | 17 Ω @ IZT = 20 mA - determines AC voltage variation under dynamic load changes |
| Leakage Current (IR) | 0.25 μA @ VR = 2 V - ensures minimal standby current draw in battery-powered systems |
| ESD Rating | Class 3 (>16 kV) per HBM - supports robust handling in automated assembly and end-use environments |
| Junction Temperature Range | −65°C to +150°C - enables operation in extended industrial and automotive ambient conditions |
Pinout & Package
SOT-23 (TO-236) surface-mount plastic package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting case with corrosion-resistant finish; polarity indicated by cathode band; Pb-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node during Zener operation; forward-biased when used as rectifier |
| 2 | No Connection | Internally isolated; no electrical function - must remain unconnected on PCB |
| 3 | Cathode | Connected to higher-potential node; voltage reference output point in regulation configuration |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating | Enables use in compact, low-power circuits without external heat sinking on standard FR-5 PCBs |
| ESD Robustness >16 kV (HBM) | Eliminates need for additional ESD protection in handheld and portable product front-end stages |
| Small SOT-23 Footprint | Supports high-density layout in smartphones, wearables, and IoT sensor nodes where board area is constrained |
| Pb-Free & RoHS Compliant | Meets global environmental compliance requirements for commercial and industrial manufacturing programs |
Applications
| USB Port Protection | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Clamping transient surges on USB D+/D− lines during hot-plug events or ESD discharge. IC Role / Device Role / Timing Role: Bidirectional voltage clamp protecting transceiver I/O pins from overvoltage stress. Use Value: Limits line voltage to ≤5.36 V, preventing damage to 5 V-tolerant USB PHY while maintaining signal integrity. |
Use Scenario: Generating a clean, temperature-stable reset threshold for 3.3 V microcontrollers. IC Role / Device Role / Timing Role: Precision voltage reference feeding comparator input in power-on reset generator. Use Value: Provides 5.1 V reference with ±5% tolerance and low tempco, ensuring reliable reset assertion across −40°C to +85°C. |
| Li-ion Battery Monitoring | Low-Power Sensor Biasing |
Use Scenario: Scaling battery pack voltage for ADC input in fuel-gauge ICs operating from single-cell Li-ion (2.7–4.2 V). IC Role / Device Role / Timing Role: Zener-based resistive divider reference stabilizing measurement accuracy. Use Value: Maintains reference stability despite supply ripple, enabling <1% SOC error over full charge cycle. |
Use Scenario: Providing stable bias voltage to analog front-end of MEMS accelerometers or temperature sensors. IC Role / Device Role / Timing Role: Low-current voltage reference source for sensor excitation or amplifier offset setting. Use Value: Draws only 0.25 μA leakage at 2 V, extending battery life in always-on wearable health monitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C5V1LT1G | Same 5.1 V nominal Zener, but 300 mW rating and 40 Ω ZZT @ 5 mA - higher power, higher impedance | Preferred where higher surge energy absorption is needed, but less suitable for low-noise reference use | Select when board layout allows larger thermal mass or when peak pulse handling >225 W is required |
| MMBZ5231BS | Same electrical specs but in SOD-123 package - 3.7 × 1.7 × 1.2 mm vs. SOT-23's 2.9 × 1.3 × 1.0 mm | Better thermal dissipation on copper pour, but occupies ~2.5× more board area | Choose when thermal margin is critical and PCB real estate is not constrained |
Compared with BZX84-C5V1LT1G and MMBZ5231BS, the MMBZ5231ELT3G delivers optimal balance of ultra-compact size, low dynamic impedance, and proven manufacturability in high-volume SMT lines - making it ideal for next-gen portable electronics requiring both miniaturization and regulation precision.
Availability
MMBZ5231ELT3G is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset generation, and low-power sensor biasing requiring stable component supply and long-term production continuity.
Supply support for MMBZ5231ELT3G 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications.
The MMBZ52xxELT3G series belongs to onsemi's precision Zener regulator family, designed specifically for space-constrained, low-power voltage reference and clamping in portable and battery-operated electronics.
FAQ
What is the exact Zener voltage tolerance for MMBZ5231ELT3G?
The MMBZ5231ELT3G has a guaranteed Zener voltage range of 4.84 V to 5.36 V at IZT = 20 mA and TA = 25°C, corresponding to a ±5% tolerance around the nominal 5.1 V value. This tolerance remains valid across the full operating junction temperature range of −65°C to +150°C, as confirmed in the Electrical Characteristics table on page 2 of the official datasheet.
Does MMBZ5231ELT3G have a functional third pin?
No, MMBZ5231ELT3G uses a three-terminal SOT-23 package with Pin 2 designated as No Connection (NC). The internal die connects only to Pin 1 (Anode) and Pin 3 (Cathode); Pin 2 is electrically isolated and must remain unconnected on the PCB layout to avoid unintended coupling or solder bridging.
Can MMBZ5231ELT3G be used in automotive applications?
Yes - the SZMMBZ5231ELT1G variant is AEC-Q101 qualified and PPAP capable for automotive use, while the standard MMBZ5231ELT3G shares identical electrical and thermal specifications. For non-safety-critical automotive subsystems (e.g., infotainment power rails), MMBZ5231ELT3G is commonly deployed with appropriate system-level validation.
What is the thermal resistance of MMBZ5231ELT3G on standard PCB?
The MMBZ5231ELT3G has a junction-to-ambient thermal resistance (RJA) of 556 °C/W when mounted on an FR-5 board per the datasheet's Note 2. This value assumes a 1.0 × 0.75 × 0.62 inch test board and forms the basis for derating calculations: power must be reduced by 1.8 mW per °C above 25°C ambient.
Is MMBZ5231ELT3G compatible with lead-free reflow processes?
Yes - MMBZ5231ELT3G is Pb-free and rated for peak reflow temperatures up to 260°C for 10 seconds, fully compliant with IPC/JEDEC J-STD-020 moisture sensitivity and lead-free soldering standards. The thermosetting plastic case and corrosion-resistant finish ensure reliability through standard SnAgCu reflow profiles.
MMBZ5231ELT3G 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):
- 5.1 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 2 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 (TO-236)
MMBZ5231ELT3G FAQ
1.How can I place an order for MMBZ5231ELT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5231ELT3G 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 MMBZ5231ELT3G reliable?
The price and inventory of MMBZ5231ELT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5231ELT3G is usually 5 days.
3.What payment methods are accepted for MMBZ5231ELT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5231ELT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5231ELT3G?
MMBZ5231ELT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5231ELT3G 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 MMBZ5231ELT3G?
For technical support, including MMBZ5231ELT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5231ELT3G requirements.
6.How does Aetrix verify that MMBZ5231ELT3G is sourced from the original manufacturer or authorized distributors?
All MMBZ5231ELT3G 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 MMBZ5231ELT3G meets industry standards.
7.What is the process for return or replacement of MMBZ5231ELT3G?
All MMBZ5231ELT3G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5231ELT3G, 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 MMBZ5231ELT3G part is unused and in its original packaging.
Return procedure for MMBZ5231ELT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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