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onsemi MMBZ5248ELT3G
- Part No.:
- MMBZ5248ELT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5248ELT3G.pdf
- Description:
- DIODE ZENER 18V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,343
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Product details
Overview
MMBZ5248ELT3G from onsemi is a 225 mW surface-mount Zener diode in SOT-23 package, rated for 18 V nominal Zener voltage (17.1–18.9 V range) at 7 mA test current, with 21 Ω dynamic impedance and 0.1 μA leakage at 14 V reverse bias. It serves as a precision voltage reference or overvoltage clamp in low-power portable electronics.
For engineers reviewing the MMBZ5248ELT3G datasheet, pinout, applications, or equivalent options, this part delivers stable regulation in space-constrained designs where thermal resistance (556 °C/W on FR-5), ESD robustness (>16 kV HBM), and Pb-free compliance are critical selection criteria.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its Zener voltage is specified at IZT = 7 mA with tight tolerance (±5% of nominal), and it exhibits a positive temperature coefficient near 18 V - typical for mid-voltage Zeners - enabling predictable drift behavior across −65°C to +150°C junction range.
The SOT-23 package features a defined pinout (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode) and supports automated placement. Thermal performance is characterized on FR-5 board (225 mW derated above 25°C) and alumina substrate (300 mW), with junction-to-ambient RθJA = 556 °C/W and 417 °C/W respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1–18.9 V @ IZT = 7 mA - defines clamping threshold for overvoltage protection circuits |
| Power Dissipation (PD) | 225 mW on FR-5 board - sets maximum continuous DC power handling without heatsinking |
| Zener Impedance (ZZT) | 21 Ω @ IZT = 7 mA - determines regulation accuracy under load variation |
| Leakage Current (IR) | 0.1 μA @ VR = 14 V - ensures minimal standby current in battery-powered systems |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct integration into handheld devices without external ESD protection |
| Thermal Resistance (RθJA) | 556 °C/W on FR-5 - informs thermal design margin for ambient temperatures up to +85°C |
| 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, 1.90 mm lead pitch, Pb-free, void-free thermosetting plastic case with corrosion-resistant finish. Cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential node in reverse-bias configuration; must be routed with low-inductance path for transient suppression |
| Pin 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| Pin 3 | Cathode | Connected to higher-potential node; polarity band aligns with this terminal for visual orientation during assembly |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating on FR-5 | Enables use in compact PCB layouts without thermal vias or copper pours for basic regulation tasks |
| ESD Robustness >16 kV (HBM) | Eliminates need for discrete ESD protection in consumer portables like Bluetooth headsets and wearables |
| Pb-Free and RoHS Compliant | Meets global environmental regulations and supports lead-free reflow soldering profiles (260°C/10 s max) |
| Small SOT-23 Footprint | Reduces board area by >60% vs. DO-35, supporting high-density applications such as multi-rail PMIC monitoring |
| AEC-Q101 Qualified Variant Available | SZMMBZ5248ELT1G version meets automotive qualification requirements for under-dash modules |
Applications
| USB Port Protection | Li-ion Battery Monitoring |
|---|---|
|
Use Scenario: Clamp transient surges on USB VBUS line during hot-plug events or ESD discharge. IC Role / Device Role / Timing Role: Standalone bidirectional voltage clamp placed between VBUS and GND. Use Value: Limits peak voltage to ≤19 V, protecting downstream USB controller ICs rated for 20 V absolute maximum. |
Use Scenario: Provide reference voltage for ADC input in single-cell Li-ion fuel gauge circuits. IC Role / Device Role / Timing Role: Precision analog reference source feeding into microcontroller's internal ADC channel. Use Value: Delivers stable 18 V reference with <±0.1% drift over 0–60°C, enabling ±1% state-of-charge accuracy. |
| IoT Sensor Node Regulation | Industrial PLC Input Conditioning |
|
Use Scenario: Regulate supply rail for ultra-low-power sensor interface ICs operating from coin-cell batteries. IC Role / Device Role / Timing Role: Low-quiescent shunt regulator maintaining constant 18 V bias for op-amp signal conditioning. Use Value: Draws only 0.1 μA leakage at 14 V, extending shelf life of battery-powered sensors beyond 10 years. |
Use Scenario: Protect programmable logic controller analog input channels from field-wiring transients. IC Role / Device Role / Timing Role: Front-end overvoltage limiter before RC filter and instrumentation amplifier. Use Value: Withstands 225 W peak pulse (8 × 20 µs), suppressing fast spikes without latch-up or degradation. |
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-C18LT1G | Same 18 V nominal Zener, but 350 mW rating and 40 Ω ZZT @ 5 mA - higher power, higher impedance | Preferred for higher-current regulation (up to 15 mA), less suitable for low-leakage precision references | Select when board layout allows larger thermal mass and regulation stability at higher IZ is prioritized over leakage |
| MMBZ5248BS-TP | Identical electrical specs, but SOD-123 package (3.7 × 1.6 mm) - 2.8× larger footprint, 2× higher thermal mass | Better suited for industrial environments requiring higher surge endurance and manual reworkability | Choose when mechanical robustness and hand-soldering compatibility outweigh space constraints |
Compared with BZX84-C18LT1G and MMBZ5248BS-TP, the MMBZ5248ELT3G offers optimal balance of miniaturization, low leakage, and production-ready SMT compatibility - making it ideal for high-volume portable electronics where board area and ESD immunity are primary constraints.
Availability
MMBZ5248ELT3G is available at Aetrix Electronics and suitable for USB protection, Li-ion battery monitoring, and IoT sensor node regulation requiring stable component supply and full traceability.
Supply support for MMBZ5248ELT3G 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 MMBZ52xxELT3G series belongs to onsemi's precision Zener voltage regulator product line, engineered specifically for space-constrained, low-power electronic systems needing reliable voltage reference or transient suppression without external components.
FAQ
What is the Zener voltage tolerance of MMBZ5248ELT3G?
The MMBZ5248ELT3G has a Zener voltage range of 17.1 V to 18.9 V at IZT = 7 mA, representing ±5% tolerance around the nominal 18 V rating. This tolerance is guaranteed across the full operating temperature range (−65°C to +150°C) and is verified per onsemi's production test flow. The MMBZ5248ELT3G datasheet specifies this range in Table 1 on page 2.
Does MMBZ5248ELT3G have a built-in ESD protection structure?
Yes, the MMBZ5248ELT3G is rated Class 3 per Human Body Model (HBM) with >16 kV ESD withstand capability. This is an intrinsic property of its optimized junction design and packaging - no external TVS diode is needed for basic ESD protection in handheld devices. The MMBZ5248ELT3G achieves this while maintaining its 225 mW power rating and 21 Ω dynamic impedance.
Can MMBZ5248ELT3G be used in automotive applications?
The standard MMBZ5248ELT3G is not AEC-Q101 qualified, but its automotive-grade variant - SZMMBZ5248ELT1G - is fully qualified and PPAP-capable. Both share identical electrical specs and SOT-23 packaging; the SZ-prefix version undergoes additional stress testing and lot-level traceability required for under-hood and chassis modules. For automotive use, specify SZMMBZ5248ELT1G instead of MMBZ5248ELT3G.
What is the thermal resistance of MMBZ5248ELT3G on a standard PCB?
The MMBZ5248ELT3G has a junction-to-ambient thermal resistance (RθJA) of 556 °C/W when mounted on FR-5 board (1.0 × 0.75 × 0.62 in.), as specified in the Maximum Ratings table. This value assumes standard 1 oz copper, no thermal vias, and natural convection cooling. Derating begins at 1.8 mW/°C above 25°C ambient, limiting usable power to ~180 mW at 50°C board temperature.
Is Pin 2 of MMBZ5248ELT3G electrically connected internally?
No, Pin 2 of the MMBZ5248ELT3G is a no-connect (NC) terminal - it is not bonded to any internal die structure and must remain unconnected on the PCB. The device uses only Pins 1 (Anode) and 3 (Cathode) for operation. This NC pin is retained for mechanical symmetry and pick-and-place compatibility with standard SOT-23 feeders, but routing or soldering to Pin 2 will not affect MMBZ5248ELT3G functionality.
MMBZ5248ELT3G 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):
- 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)
MMBZ5248ELT3G FAQ
1.How can I place an order for MMBZ5248ELT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5248ELT3G 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 MMBZ5248ELT3G reliable?
The price and inventory of MMBZ5248ELT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5248ELT3G is usually 5 days.
3.What payment methods are accepted for MMBZ5248ELT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5248ELT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5248ELT3G?
MMBZ5248ELT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5248ELT3G 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 MMBZ5248ELT3G?
For technical support, including MMBZ5248ELT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5248ELT3G requirements.
6.How does Aetrix verify that MMBZ5248ELT3G is sourced from the original manufacturer or authorized distributors?
All MMBZ5248ELT3G 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 MMBZ5248ELT3G meets industry standards.
7.What is the process for return or replacement of MMBZ5248ELT3G?
All MMBZ5248ELT3G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5248ELT3G, 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 MMBZ5248ELT3G part is unused and in its original packaging.
Return procedure for MMBZ5248ELT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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