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onsemi MMBZ5250ELT3G
- Part No.:
- MMBZ5250ELT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5250ELT3G.pdf
- Description:
- DIODE ZENER 20V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,034
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Product details
Overview
MMBZ5250ELT3G from onsemi is a 20 V, 225 mW surface-mount Zener diode in SOT-23 package, designed for precision voltage regulation and transient suppression in space-constrained circuits. It delivers 6.2 mA test current at 20 V nominal Zener voltage, exhibits 25 Ω dynamic impedance at IZT, and supports ≤0.1 µA leakage at 15 V reverse bias - ideal for voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the MMBZ5250ELT3G datasheet, pinout, applications, or equivalent options, key selection criteria include its 20 V ±5% Zener tolerance, 225 mW DC power rating on FR-5 board, Class 3 ESD robustness (>16 kV HBM), and SOT-23 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal voltage reference diode with cathode-anode polarity and no internal connection on pin 2. Its Zener breakdown mechanism provides stable reverse conduction at 20 V with low dynamic impedance (25 Ω) under 6.2 mA test current, enabling accurate clamping in low-power analog and digital supply monitoring paths.
Thermal performance is defined by 556 °C/W junction-to-ambient resistance on FR-5 board and −65 °C to +150 °C operating temperature range. The SOT-23 package supports automated placement and reflow soldering at 260 °C for 10 seconds, with UL 94 V-0 flammability rating and Pb-free compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19.0–21.0 V @ 6.2 mA - defines precise clamping threshold for 20 V rail protection |
| Power Dissipation (PD) | 225 mW @ TA = 25°C on FR-5 - sets maximum continuous DC power handling in standard PCB environments |
| Zener Impedance (ZZT) | 25 Ω @ IZT = 6.2 mA - ensures minimal voltage shift under load variation for stable reference accuracy |
| Leakage Current (IR) | ≤0.1 µA @ VR = 15 V - guarantees negligible standby current draw in battery-powered systems |
| ESD Rating | Class 3 (>16 kV HBM) - provides robust electrostatic immunity without external protection circuitry |
| Package | SOT-23 (TO-236) - enables 2.9 × 1.3 × 1.0 mm footprint for high-density portable PCBs |
| Junction Temp Range | −65 °C to +150 °C - supports operation in automotive under-hood and industrial ambient conditions |
Pinout & Package
SOT-23 plastic surface-mount package with void-free thermosetting case, corrosion-resistant finish, and cathode indicated by polarity band. Maximum soldering temperature: 260 °C for 10 seconds. Flammability rating: UL 94 V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward-biased terminal; connects to lower-potential node during Zener operation |
| 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| 3 | Cathode | Zener output terminal; connects to regulated voltage node or clamp point |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating | Enables reliable voltage clamping in compact 3.3 V/5 V/12 V auxiliary rails without heatsinking |
| 25 Ω Dynamic Impedance | Maintains <±0.1 V regulation error across 1–10 mA load current variations |
| Class 3 ESD Robustness | Eliminates need for discrete ESD diodes in handheld USB/IO interface protection |
| Pb-Free & RoHS Compliant | Meets global environmental compliance requirements for consumer and industrial end products |
| Automated Assembly Optimized | Standard SOT-23 footprint supports high-yield pick-and-place and reflow processes |
Applications
| Portable Power Rail Protection | Low-Power Voltage Reference |
|---|---|
|
Use Scenario: Clamping transient spikes on 20 V DC-DC converter output in Bluetooth headset charging circuit. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator and overvoltage limiter. Use Value: Prevents >21 V excursions from damaging downstream LDOs and audio codecs with 25 Ω low-impedance clamping path. |
Use Scenario: Providing stable 20 V reference for ADC biasing in battery-powered gas sensor module. IC Role / Device Role / Timing Role: Precision voltage reference source with minimal temperature drift. Use Value: Delivers 19–21 V tolerance and <0.1 µA leakage to extend 10-year battery life while maintaining 12-bit ADC linearity. |
| ESD-Sensitive Interface Protection | Industrial Sensor Signal Conditioning |
|
Use Scenario: Protecting UART TX/RX lines in smart meter against contact discharge events. IC Role / Device Role / Timing Role: Bidirectional ESD clamp leveraging Zener reverse/forward conduction. Use Value: Withstands >16 kV HBM ESD pulses without degradation, eliminating need for TVS arrays in cost-sensitive designs. |
Use Scenario: Stabilizing excitation voltage for 4–20 mA loop-powered pressure transducer. IC Role / Device Role / Timing Role: Shunt regulator maintaining constant 20 V supply despite loop current fluctuations. Use Value: Compensates for 0–25 mA loop current variation using 225 mW dissipation margin and 556 °C/W thermal resistance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C20LT1G | 20 V ±5%, 300 mW rating, 30 Ω ZZT @ 5 mA - higher power but larger Zener impedance | Preferred for higher-energy transient suppression where 300 mW margin is critical | Select when board layout allows slightly larger thermal mass and lower regulation precision is acceptable |
| MMBZ5250BS | Same 20 V Zener spec but in SOD-323 package - 1.7 × 1.3 × 0.9 mm vs. SOT-23's 2.9 × 1.3 × 1.0 mm | Better suited for ultra-high-density RF modules where footprint area is constrained | Choose when PCB real estate is more critical than thermal derating capability |
Compared with BZX84-C20LT1G and MMBZ5250BS, the MMBZ5250ELT3G offers optimal balance of 225 mW power handling, 25 Ω low-impedance regulation, and SOT-23 manufacturability - making it preferred for mainstream portable and industrial voltage reference designs requiring proven assembly yield and thermal predictability.
Availability
MMBZ5250ELT3G is available at Aetrix Electronics and suitable for portable electronics, industrial sensor interfaces, and battery management systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MMBZ5250ELT3G 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 is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications - focused on enabling sustainable technology innovation.
The MMBZ52xxELT3G series targets space-constrained voltage regulation and ESD protection in portable and high-density electronics, emphasizing reliability, manufacturability, and compliance with automotive (AEC-Q101) and industrial standards.
FAQ
What is the Zener voltage tolerance of MMBZ5250ELT3G?
The MMBZ5250ELT3G has a Zener voltage range of 19.0 V to 21.0 V at 6.2 mA test current, corresponding to a ±5% tolerance around the nominal 20 V rating. This tolerance is guaranteed across the full operating temperature range of −65 °C to +150 °C and is verified per onsemi's production test flow.
Does MMBZ5250ELT3G have a built-in ESD protection rating?
Yes, the MMBZ5250ELT3G is rated Class 3 per Human Body Model (HBM) with >16 kV ESD withstand capability. This is achieved through optimized junction design and packaging - no external ESD components are needed when used as a standalone clamp in I/O protection circuits.
What is the thermal resistance of MMBZ5250ELT3G on a standard FR-5 PCB?
The MMBZ5250ELT3G exhibits a junction-to-ambient thermal resistance (RJA) of 556 °C/W when mounted on an FR-5 board per JEDEC JESD51-2. This value assumes standard 1.0 × 0.75 × 0.62 inch test board dimensions and defines safe DC power derating above 25 °C ambient.
Can MMBZ5250ELT3G be used in automotive applications?
Yes - the SZMMBZ5250ELT1G variant is AEC-Q101 qualified and PPAP capable. While the standard MMBZ5250ELT3G shares identical electrical and thermal specs, automotive qualification requires the SZ-prefix part with controlled site and change management per onsemi's automotive quality system.
What does the "T3G" suffix indicate in MMBZ5250ELT3G?
The "T3G" suffix denotes tape-and-reel packaging with 10,000 units per reel and Pb-free (RoHS-compliant) construction. The "G" confirms lead-free termination, and "T3" specifies the 10k/reel configuration - distinct from "T1G" (3k/reel) variants in the same series.
MMBZ5250ELT3G 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)
MMBZ5250ELT3G FAQ
1.How can I place an order for MMBZ5250ELT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5250ELT3G 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 MMBZ5250ELT3G reliable?
The price and inventory of MMBZ5250ELT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5250ELT3G is usually 5 days.
3.What payment methods are accepted for MMBZ5250ELT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5250ELT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5250ELT3G?
MMBZ5250ELT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5250ELT3G 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 MMBZ5250ELT3G?
For technical support, including MMBZ5250ELT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5250ELT3G requirements.
6.How does Aetrix verify that MMBZ5250ELT3G is sourced from the original manufacturer or authorized distributors?
All MMBZ5250ELT3G 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 MMBZ5250ELT3G meets industry standards.
7.What is the process for return or replacement of MMBZ5250ELT3G?
All MMBZ5250ELT3G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5250ELT3G, 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 MMBZ5250ELT3G part is unused and in its original packaging.
Return procedure for MMBZ5250ELT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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