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onsemi MMBZ5248ELT1G
- Part No.:
- MMBZ5248ELT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5248ELT1G.pdf
- Description:
- DIODE ZENER 18V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,164
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Product details
Overview
MMBZ5248ELT1G from onsemi is a 225 mW surface-mount Zener diode in SOT-23 package, rated for 18 V nominal reverse breakdown voltage at 7 mA test current, with 21 Ω dynamic impedance and 0.1 μA leakage at 14 V reverse bias. It delivers precision voltage regulation in space-constrained power rails for portable electronics and high-density PCBs.
For engineers reviewing the MMBZ5248ELT1G datasheet, pinout, applications, or equivalent options, this device serves as a low-power, ESD-hardened (Class 3, >16 kV HBM) voltage reference and overvoltage clamp in battery-powered systems where thermal efficiency and board area are critical.
Technical Context
This Zener regulator operates in reverse-biased avalanche mode to maintain stable voltage across its cathode-anode terminals. Its 18 V nominal Zener voltage exhibits a positive temperature coefficient near zero crossing, minimizing drift over −65°C to +150°C operating range.
The SOT-23 package features a no-connect (NC) terminal (Pin 2), enabling mechanical stability without electrical function. Thermal resistance is 556°C/W on FR-5 board, supporting 225 mW continuous dissipation at 25°C ambient with 1.8 mW/°C derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1–18.9 V @ IZT = 7 mA - defines regulated output voltage tolerance band under standard test conditions |
| Zener Impedance (ZZT) | 21 Ω @ IZT = 7 mA - determines output voltage variation under load transients |
| Power Dissipation (PD) | 225 mW on FR-5 board @ TA = 25°C - sets maximum steady-state thermal budget for PCB layout |
| Leakage Current (IR) | 0.1 μA @ VR = 14 V - ensures minimal standby current draw in low-power sleep modes |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct integration into handheld devices without external ESD protection |
| Junction Temperature Range | −65°C to +150°C - supports operation in automotive under-hood and industrial environments |
Pinout & Package
SOT-23 (TO-236) package: 2.90 mm × 1.30 mm × 1.00 mm body, Pb-free, void-free thermoset plastic case with corrosion-resistant finish; polarity indicated by cathode band; max soldering temperature 260°C for 10 s.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; carries forward current during fault conditions |
| 2 | No Connection | Mechanical support only; must remain unconnected in PCB layout to avoid parasitic coupling or thermal stress |
| 3 | Cathode | Connected to regulated output node; source of reference voltage and clamping action during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating on FR-5 Board | Enables compact voltage regulation without heatsinking in consumer-grade PCBs |
| ESD Hardness >16 kV (HBM) | Eliminates need for discrete ESD protection in USB ports, button interfaces, and sensor inputs |
| Pb-Free and RoHS-Compliant Packaging | Meets global environmental compliance requirements for commercial and industrial shipments |
| Peak Pulse Power: 225 W (8 × 20 μs) | Withstands transient surges from EFT and lightning-induced coupling without degradation |
| Low Leakage: 0.1 μA @ 14 V | Preserves battery life in always-on monitoring circuits and real-time clock backup rails |
Applications
| Smartphone Power Management | IoT Sensor Node Reference |
|---|---|
|
Use Scenario: Regulating bias voltage for RF front-end LNA and PMIC enable logic in LTE/5G handsets. IC Role / Device Role / Timing Role: Zener voltage reference and overvoltage clamp protecting 1.8 V/3.3 V supply domains. Use Value: Maintains ±5% regulation accuracy across −30°C to +85°C while occupying <1.5 mm² PCB area. |
Use Scenario: Providing stable 18 V reference for analog front-end ADC drivers in battery-powered environmental sensors. IC Role / Device Role / Timing Role: Precision shunt reference establishing known voltage threshold for comparator trip points. Use Value: Delivers <21 Ω dynamic impedance to minimize code shift under varying sensor load currents. |
| USB-C Port Protection | Industrial PLC Input Conditioning |
|
Use Scenario: Clamping VBUS line transients during hot-plug events in portable accessories. IC Role / Device Role / Timing Role: Fast-response overvoltage suppressor placed before USB PD controller input. Use Value: Absorbs 225 W peak pulses (8 × 20 μs) without latch-up, preserving port functionality after surge. |
Use Scenario: Level-shifting and surge suppression for 24 V digital input modules in factory automation controllers. IC Role / Device Role / Timing Role: Shunt regulator stabilizing optocoupler LED drive voltage against supply ripple. Use Value: Operates reliably from −40°C to +125°C with <0.1 μA leakage at 14 V, reducing false-trigger risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18LT1G | Same 18 V nominal Zener, but 300 mW rating and 40 Ω ZZT @ 5 mA; SOT-23 package | Higher power margin but looser regulation; better for higher-current clamping | Select when >225 mW continuous dissipation or higher surge energy handling is required |
| MMBZ5248BS | Same electrical specs, but SOD-123 package (3.7 × 1.6 × 1.1 mm); no Pin 2 NC terminal | Larger footprint, lower thermal resistance (417°C/W on alumina), no NC pin constraint | Select when board layout allows larger package and improved thermal performance is prioritized over size |
Compared with BZX84-C18LT1G and MMBZ5248BS, the MMBZ5248ELT1G offers optimal balance of ultra-compact SOT-23 size, Class 3 ESD robustness, and tight 21 Ω impedance-making it preferred for high-density portable designs where space and reliability are co-constrained.
Availability
MMBZ5248ELT1G is available at Aetrix Electronics and suitable for smartphone power management, IoT sensor node reference, USB-C port protection, and industrial PLC input conditioning requiring stable component supply and full traceability.
Supply support for MMBZ5248ELT1G 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZ52xxELT1G series targets space-constrained, low-power voltage regulation and transient suppression in portable and high-density electronics, emphasizing reliability, ESD hardness, and Pb-free compliance.
FAQ
What is the nominal Zener voltage and test current for MMBZ5248ELT1G?
The MMBZ5248ELT1G has a nominal Zener voltage of 18 V, specified at a test current (IZT) of 7 mA. Its minimum and maximum Zener voltages are 17.1 V and 18.9 V respectively under those conditions. This parameter defines the core regulation point used in circuit design and tolerance analysis for the MMBZ5248ELT1G.
Does MMBZ5248ELT1G have a no-connect pin, and how should it be handled in layout?
Yes, MMBZ5248ELT1G uses Pin 2 as a no-connect (NC) terminal per the SOT-23 Style 8 pinout. It serves only for mechanical reinforcement and must remain unconnected in PCB routing. Connecting Pin 2 risks introducing parasitic capacitance or thermal stress that could degrade MMBZ5248ELT1G performance or reliability.
What is the maximum continuous power dissipation for MMBZ5248ELT1G on standard FR-5 PCB?
The MMBZ5248ELT1G is rated for 225 mW total power dissipation on FR-5 board at 25°C ambient, with a derating factor of 1.8 mW/°C above that temperature. This value assumes standard JEDEC-defined board geometry (1.0 × 0.75 × 0.62 in.) and defines the thermal design limit for sustained operation of the MMBZ5248ELT1G.
How does the ESD rating of MMBZ5248ELT1G compare to typical consumer-grade Zeners?
The MMBZ5248ELT1G is rated Class 3 (>16 kV) per Human Body Model (HBM), exceeding the 8 kV typical of standard Zeners. This high ESD immunity allows direct placement on exposed I/O lines-such as USB data lines or pushbutton inputs-without additional protection components, simplifying BOM and layout for the MMBZ5248ELT1G.
Can MMBZ5248ELT1G be used as a substitute for MMBZ5248BS in existing designs?
No-MMBZ5248ELT1G and MMBZ5248BS share identical electrical specifications but differ in package: MMBZ5248ELT1G uses SOT-23 with Pin 2 NC, while MMBZ5248BS uses SOD-123 with only two terminals. PCB layout, thermal path, and assembly process must be requalified; they are not drop-in replacements despite matching Zener parameters for the MMBZ5248ELT1G.
MMBZ5248ELT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 21 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 14 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)
MMBZ5248ELT1G FAQ
1.How can I place an order for MMBZ5248ELT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5248ELT1G 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 MMBZ5248ELT1G reliable?
The price and inventory of MMBZ5248ELT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5248ELT1G is usually 5 days.
3.What payment methods are accepted for MMBZ5248ELT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5248ELT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5248ELT1G?
MMBZ5248ELT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5248ELT1G 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 MMBZ5248ELT1G?
For technical support, including MMBZ5248ELT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5248ELT1G requirements.
6.How does Aetrix verify that MMBZ5248ELT1G is sourced from the original manufacturer or authorized distributors?
All MMBZ5248ELT1G 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 MMBZ5248ELT1G meets industry standards.
7.What is the process for return or replacement of MMBZ5248ELT1G?
All MMBZ5248ELT1G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5248ELT1G, 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 MMBZ5248ELT1G part is unused and in its original packaging.
Return procedure for MMBZ5248ELT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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