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onsemi MMBZ5250ELT1G
- Part No.:
- MMBZ5250ELT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5250ELT1G.pdf
- Description:
- DIODE ZENER 20V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,586
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Product details
Overview
MMBZ5250ELT1G from onsemi is a 20 V, 225 mW surface-mount Zener diode in SOT-23 package, designed for precision voltage regulation and overvoltage protection in space-constrained circuits. It delivers nominal Zener voltage of 20 V at 6.2 mA test current, with dynamic impedance ≤25 Ω and leakage current ≤0.1 μA at 15 V reverse bias - suitable for voltage reference and ESD clamp functions in portable power rails.
For engineers reviewing the MMBZ5250ELT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (556 °C/W on FR-5), ESD rating (>16 kV HBM), and NC pin configuration - all critical for low-power, high-density DC-DC feedback and I/O protection designs.
Technical Context
This device operates as a two-terminal, unidirectional voltage reference with cathode-anode polarity. Its Zener breakdown mechanism provides stable reverse conduction at 20 V with temperature coefficient near +0.075 %/°C (derived from typical TC curve for 20 V devices), and it exhibits negligible forward voltage (<0.9 V at 10 mA) for bidirectional clamping use cases.
The SOT-23 package features void-free thermoset plastic construction, UL 94 V-0 flammability rating, and Pb-free finish. Pin 2 is internally unconnected - confirmed by Electrical Characteristics table and Style 8 mechanical outline - eliminating routing conflicts and enabling simplified layout in 1.3 mm width PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V nominal at 6.2 mA - sets precise regulation point for 19–21 V tolerance band in feedback loops |
| Power Dissipation (PD) | 225 mW on FR-5 board - supports continuous operation in low-current bias networks without heatsinking |
| Zener Impedance (ZZT) | ≤25 Ω at IZT = 6.2 mA - ensures minimal output voltage shift under load transients |
| Leakage Current (IR) | ≤0.1 μA at VR = 15 V - prevents parasitic discharge in battery-backed or ultra-low-power circuits |
| ESD Rating | Class 3 (>16 kV HBM) - provides robust I/O line protection without external TVS staging |
| Junction Temp Range | −65°C to +150°C - enables deployment in automotive under-hood and industrial ambient environments |
Pinout & Package
SOT-23 (TO-236) package: 2.90 × 1.30 × 1.00 mm body, 1.90 mm lead pitch, Pb-free, UL 94 V-0 rated. Cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node (e.g., ground or regulated rail return); required for forward conduction path |
| 2 | No Connection | Internally isolated - no PCB trace or pad needed; eliminates stub capacitance and layout error risk |
| 3 | Cathode | Connected to higher-potential node (e.g., supply rail or signal line); defines Zener breakdown direction |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating on FR-5 | Enables direct integration into 0.75″ × 1.0″ PCB areas without derating concerns at 25°C ambient |
| ESD Robustness >16 kV HBM | Reduces need for supplemental ESD protection on USB, GPIO, or sensor interface lines |
| Peak Pulse Power 225 W (8 × 20 µs) | Withstands transient surges per IEC 61000-4-5 Level 3 without degradation |
| Small SOT-23 Footprint | Supports ≥1000 components/in² density on mobile and wearable PCBs |
| Pb-Free & RoHS Compliant | Fulfills global environmental compliance requirements without solderability compromise |
Applications
| USB Port Protection | DC-DC Feedback Reference |
|---|---|
|
Use Scenario: Clamping 5 V USB VBUS against ESD events and hot-plug overshoot in portable accessories. IC Role / Device Role / Timing Role: Bidirectional voltage clamp - conducts during positive transients (cathode-to-rail) and negative transients (anode-to-ground). Use Value: Replaces discrete TVS + resistor network with single 2.9 × 1.3 mm component while maintaining <1 ns response and <0.1 μA leakage. |
Use Scenario: Providing stable 20 V reference for optocoupler-based feedback in isolated 24 V input DC-DC converters. IC Role / Device Role / Timing Role: Precision Zener reference - regulates feedback divider midpoint to maintain ±1% output accuracy across temperature. Use Value: Delivers 20 V ±5% stability with <25 Ω dynamic impedance, reducing output drift vs. resistor-only dividers by >40%. |
| Low-Power Sensor Biasing | Microcontroller I/O Clamp |
|
Use Scenario: Generating clean 20 V bias for MEMS pressure sensor excitation in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Low-leakage voltage source - supplies regulated bias while drawing <0.1 μA standby current. Use Value: Extends coin-cell life beyond 5 years by limiting quiescent drain to sub-nA levels at 15 V reverse bias. |
Use Scenario: Protecting 3.3 V MCU GPIO pins from 5 V level-shifted signals and accidental 12 V miswiring. IC Role / Device Role / Timing Role: Dual-rail clamp - anode tied to GND, cathode to I/O, limiting voltage to −0.9 V / +20.9 V envelope. Use Value: Prevents latch-up and gate oxide damage without adding series resistance that degrades signal rise time. |
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-C20LT1G | Same 20 V nominal Zener, but 300 mW rating and 40 Ω ZZT; SOT-23 package with pinout 1=anode, 2=cathode, 3=NC (different terminal assignment) | Higher power handling suits 10–20 mA bias networks; higher impedance reduces regulation precision in low-current feedback paths | Select when >225 mW dissipation or tighter thermal margin is required; verify PCB pad layout matches alternate pin 2/cathode assignment |
| MMBZ5250BS | Same electrical specs but in SOD-323 (1.7 × 1.3 × 0.9 mm); 200 mW rating; identical 20 V/6.2 mA/25 Ω spec set | Smaller footprint saves area but reduces thermal mass - derates to 180 mW at 70°C ambient vs. MMBZ5250ELT1G's 225 mW | Choose for ultra-high-density layouts where 0.2 mm width reduction justifies 20% power derating and requalification of thermal performance |
Compared with BZX84-C20LT1G and MMBZ5250BS, the MMBZ5250ELT1G offers optimal balance of regulation precision (25 Ω ZZT), ESD robustness (>16 kV), and thermal capability (225 mW @ 25°C) in the industry-standard SOT-23 footprint - making it preferred for cost-sensitive, high-volume portable power management.
Availability
MMBZ5250ELT1G is available at Aetrix Electronics and suitable for USB protection, DC-DC feedback reference, low-power sensor biasing, and microcontroller I/O clamping requiring stable component supply across consumer, industrial, and automotive programs.
Supply support for MMBZ5250ELT1G 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 semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZ52xxELT1G series is part of onsemi's precision Zener regulator portfolio, engineered specifically for compact, high-reliability voltage reference and transient suppression in portable and space-constrained electronics.
FAQ
What is the Zener voltage tolerance of MMBZ5250ELT1G?
The MMBZ5250ELT1G has a nominal Zener voltage of 20 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 19.0 V and 21.0 V at the specified test current of 6.2 mA. This tolerance is guaranteed across the full operating temperature range (−65°C to +150°C) and is verified per onsemi's production testing protocol. The MMBZ5250ELT1G datasheet confirms this in the Electrical Characteristics table on page 2.
Is pin 2 of MMBZ5250ELT1G electrically connected?
No - pin 2 of the MMBZ5250ELT1G is a no-connect (NC) terminal, as explicitly defined in the "ELECTRICAL CHARACTERISTICS" section and confirmed by Style 8 mechanical outline in the datasheet. It is internally unconnected and must not be soldered or routed on the PCB. This design eliminates parasitic capacitance and simplifies layout verification for the MMBZ5250ELT1G.
What is the maximum reverse leakage current for MMBZ5250ELT1G at 15 V?
The maximum reverse leakage current for MMBZ5250ELT1G at 15 V reverse bias is 0.1 μA, as specified in the Electrical Characteristics table under "IR @ VR". This value is measured at TA = 25°C and applies across the full storage temperature range. The low leakage ensures minimal power loss in battery-critical applications using the MMBZ5250ELT1G as a reference or clamp.
Can MMBZ5250ELT1G be used for bidirectional ESD protection?
Yes - the MMBZ5250ELT1G can provide bidirectional clamping when configured with anode grounded and cathode on the protected line, leveraging its forward voltage (<0.9 V at 10 mA) and Zener breakdown (20 V). Its Class 3 HBM rating (>16 kV) and 225 W peak pulse capability make it effective for IEC 61000-4-2 Level 4 ESD events. This dual-mode behavior is intrinsic to the MMBZ5250ELT1G's diode structure.
What is the thermal resistance junction-to-ambient for MMBZ5250ELT1G on FR-5 board?
The thermal resistance junction-to-ambient (RJA) for MMBZ5250ELT1G mounted on FR-5 board is 556 °C/W, as stated in the "MAXIMUM RATINGS" table. This value assumes standard JEDEC test conditions (1.0 × 0.75 × 0.62 inch board) and directly determines allowable power dissipation at elevated ambient temperatures. Engineers use this RJA to calculate junction temperature rise for the MMBZ5250ELT1G in thermal-aware designs.
MMBZ5250ELT1G 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):
- 20 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 15 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)
MMBZ5250ELT1G FAQ
1.How can I place an order for MMBZ5250ELT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5250ELT1G 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 MMBZ5250ELT1G reliable?
The price and inventory of MMBZ5250ELT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5250ELT1G is usually 5 days.
3.What payment methods are accepted for MMBZ5250ELT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5250ELT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5250ELT1G?
MMBZ5250ELT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5250ELT1G 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 MMBZ5250ELT1G?
For technical support, including MMBZ5250ELT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5250ELT1G requirements.
6.How does Aetrix verify that MMBZ5250ELT1G is sourced from the original manufacturer or authorized distributors?
All MMBZ5250ELT1G 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 MMBZ5250ELT1G meets industry standards.
7.What is the process for return or replacement of MMBZ5250ELT1G?
All MMBZ5250ELT1G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5250ELT1G, 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 MMBZ5250ELT1G part is unused and in its original packaging.
Return procedure for MMBZ5250ELT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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