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onsemi MMBZ5246ELT1
- Part No.:
- MMBZ5246ELT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5246ELT1.pdf
- Description:
- DIODE ZENER 16V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:57,000
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Product details
Overview
MMBZ5246ELT1 from onsemi is a 16 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 7.8 mA test current at 16 V nominal Zener voltage, exhibits 17 Ω dynamic impedance at IZT, and maintains ≤0.1 µA leakage at 12 V reverse bias - ideal for voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the MMBZ5246ELT1 datasheet, pinout, applications, or equivalent options, key selection criteria include its 16 V regulation tolerance (±5%), Class 3 ESD rating (>16 kV HBM), thermal resistance of 556 °C/W on FR-5 board, and NC pin configuration enabling simplified layout in low-noise analog supply monitoring.
Technical Context
This device operates as a two-terminal voltage reference with cathode-anode polarity, where Zener breakdown occurs at precisely 15.2–16.8 V under 7.8 mA test current. Its 600 Ω maximum impedance at knee current (IZK) ensures stable regulation even near minimum bias conditions.
The SOT-23 package features void-free thermoset plastic construction, UL 94 V-0 flammability rating, and 260 °C soldering tolerance for reflow compatibility. Pin 2 is internally unconnected - eliminating routing conflicts and simplifying PCB design for single-point regulation nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 15.2–16.8 V @ 7.8 mA - defines tight regulation window for 16 V rail stabilization |
| Power Dissipation (PD) | 225 mW on FR-5 board - supports continuous operation in handheld device power domains |
| Zener Impedance (ZZT) | 17 Ω @ IZT - ensures minimal output voltage shift under load transients |
| Leakage Current (IR) | ≤0.1 µA @ 12 V - enables ultra-low quiescent current in battery-backed reference circuits |
| ESD Rating | Class 3 (>16 kV HBM) - protects against handling-induced damage during assembly |
| Thermal Resistance (RJA) | 556 °C/W - determines junction temperature rise in compact PCB layouts |
| Package | SOT-23 (TO-236) - 2.90 × 1.30 × 1.00 mm footprint for high-density portable designs |
Pinout & Package
SOT-23 plastic surface-mount package with cathode band marking; case temperature rated to 260 °C for 10 s during soldering; polarity band denotes cathode terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; reverse-biased during Zener operation |
| 2 | No Connection | Internally isolated - no PCB trace required; eliminates stub routing and parasitic capacitance |
| 3 | Cathode | Connected to regulated voltage node; marked by polarity band on package |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating | Enables stable regulation in 3.3 V/5 V auxiliary rails without external heat sinking |
| Class 3 ESD Protection | Eliminates need for discrete ESD diodes in front-end protection stages of USB-powered devices |
| NC Pin Configuration | Reduces PCB layer count by removing requirement for isolation trace under Pin 2 |
| Pb-Free Construction | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 |
| −65 °C to +150 °C Operating Range | Supports deployment in automotive cabin modules and industrial sensor nodes without derating |
Applications
| Portable Power Supervision | USB-C Power Delivery Reference |
|---|---|
|
Use Scenario: Monitoring 16 V intermediate bus in Bluetooth headset charging circuitry. IC Role / Device Role / Timing Role: Zener diode providing precise shunt voltage reference for ADC input scaling. Use Value: 17 Ω ZZT minimizes measurement error across 0–10 mA load variation, ensuring ±0.5% ADC accuracy. |
Use Scenario: Clamping feedback voltage in programmable buck converter for USB-C PD sink. IC Role / Device Role / Timing Role: Shunt regulator establishing 16 V threshold for overvoltage lockout comparator. Use Value: ≤0.1 µA leakage at 12 V prevents false triggering during low-power suspend mode. |
| Industrial Sensor Signal Conditioning | Automotive Body Control Module |
|
Use Scenario: Stabilizing excitation voltage for 4–20 mA loop transmitter powered from 24 V rail. IC Role / Device Role / Timing Role: Precision Zener reference for DAC output buffer biasing. Use Value: 15.2–16.8 V tolerance ensures consistent 16 V setpoint across temperature (−40 °C to +85 °C). |
Use Scenario: Overvoltage protection on LIN bus transceiver VCC input in door module. IC Role / Device Role / Timing Role: Transient suppressor clamping spikes above 16.8 V during load dump events. Use Value: 225 W peak pulse capability (8 × 20 µs) absorbs ISO 7637-2 Pulse 5a energy without failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C16LT1G | 16 V nominal, 350 mW rating, 40 Ω ZZT @ 5 mA - higher power but looser regulation | Preferred where higher surge margin is needed but tighter voltage tolerance is not critical | Select when board-level thermal management allows larger dissipation and ±6% VZ tolerance is acceptable |
| MMBZ5246BS | Same 16 V spec, SOD-123 package - 3.7 × 2.7 × 1.2 mm vs. SOT-23's 2.9 × 1.3 × 1.0 mm | Used where hand-soldering or higher mechanical robustness is prioritized over density | Choose for prototyping or low-volume assemblies requiring easier visual inspection and rework |
Compared with BZX84-C16LT1G and MMBZ5246BS, the MMBZ5246ELT1 offers superior voltage precision (±5% vs. ±6%) and smallest footprint - making it optimal for production-scale portable electronics where board area and regulation accuracy are constrained.
Availability
MMBZ5246ELT1 is available at Aetrix Electronics and suitable for portable power supervision, USB-C power delivery reference, and industrial sensor signal conditioning requiring stable component supply across high-mix manufacturing cycles.
Supply support for MMBZ5246ELT1 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 - with core expertise in discrete, analog, and power management technologies.
The MMBZ52xxELT1G series targets compact, high-reliability voltage regulation in space-constrained consumer and automotive electronics - emphasizing low-profile packaging, high ESD immunity, and tight parametric control for mission-critical reference functions.
FAQ
What is the exact Zener voltage tolerance for MMBZ5246ELT1 at 25°C?
The MMBZ5246ELT1 has a guaranteed Zener voltage range of 15.2 V (minimum) to 16.8 V (maximum) at 7.8 mA test current and 25°C ambient temperature - corresponding to ±5% tolerance around the 16 V nominal value specified in the Electrical Characteristics table.
Does MMBZ5246ELT1 have a functional third pin, and how should Pin 2 be handled on the PCB?
No - Pin 2 of the MMBZ5246ELT1 is internally unconnected (NC) per the datasheet's pinout definition. It must remain un-routed on the PCB; no trace, pad, or thermal relief should connect to this terminal to avoid unintended coupling or assembly defects.
Can MMBZ5246ELT1 be used in automotive applications, and what qualification does it hold?
The MMBZ5246ELT1 itself is not AEC-Q101 qualified; however, the SZMMBZ5246ELT1G variant (same electrical specs, automotive-grade traceability) is AEC-Q101 qualified and PPAP capable - making it the designated version for under-hood and cabin module deployments.
What is the maximum allowable reverse leakage current for MMBZ5246ELT1, and at what voltage is it measured?
The MMBZ5246ELT1 exhibits ≤0.1 µA reverse leakage current when biased at 12 V (VR = 12 V), as confirmed in the Electrical Characteristics table - a critical parameter for maintaining accuracy in low-current reference and battery-monitoring circuits.
How does the thermal resistance of MMBZ5246ELT1 impact its usable power in a typical FR-5 PCB layout?
With RJA = 556 °C/W on FR-5 board, the MMBZ5246ELT1 reaches its 150°C max junction temperature at just 225 mW dissipation at 25°C ambient - confirming its 225 mW rating is absolute maximum under those conditions and requires derating linearly above 25°C.
MMBZ5246ELT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 16 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 12 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)
MMBZ5246ELT1 FAQ
1.How can I place an order for MMBZ5246ELT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5246ELT1 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 MMBZ5246ELT1 reliable?
The price and inventory of MMBZ5246ELT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5246ELT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5246ELT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5246ELT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5246ELT1?
MMBZ5246ELT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5246ELT1 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 MMBZ5246ELT1?
For technical support, including MMBZ5246ELT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5246ELT1 requirements.
6.How does Aetrix verify that MMBZ5246ELT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5246ELT1 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 MMBZ5246ELT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5246ELT1?
All MMBZ5246ELT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5246ELT1, 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 MMBZ5246ELT1 part is unused and in its original packaging.
Return procedure for MMBZ5246ELT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5246ELT1 Tags
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