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onsemi MMSZ5246ET1
- Part No.:
- MMSZ5246ET1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5246ET1.pdf
- Description:
- DIODE ZENER 16V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:4,885
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Product details
Overview
MMSZ5246ET1 from onsemi is a 16 V ±5% Zener diode in SOD-123 package, rated for 500 mW power dissipation at 75 °C on FR-5 board, with 17 Ω dynamic impedance at 7.8 mA test current and 0.1 µA leakage at 12 V reverse bias - used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMSZ5246ET1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal derating behavior, junction-to-lead thermal resistance, and HBM ESD rating - all critical for stable operation in space-constrained industrial sensor nodes and automotive body electronics.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown when biased above its nominal 16 V Zener voltage. Its 17 Ω dynamic impedance at IZT = 7.8 mA ensures stable regulation under moderate load transients, while the 150 °C/W junction-to-lead thermal resistance supports reliable heat transfer to PCB copper in high-density layouts.
The SOD-123 package enables automated placement and reflow soldering per JEDEC J-STD-020, with UL 94 V-0 flammability rating and 260 °C/10 s maximum solder temperature. Its cathode band marking and polarity-defined terminal roles simplify orientation verification during assembly and functional testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 15.2–16.8 V at IZT = 7.8 mA; ±5% tolerance ensures predictable clamping level in voltage-reference designs. |
| Power Dissipation (PD) | 500 mW at TL = 75 °C on FR-5 board; derates linearly at 6.7 mW/°C above 75 °C for thermal margin planning. |
| Zener Impedance (ZZT) | 17 Ω max at IZT = 7.8 mA; low dynamic impedance minimizes output voltage variation under changing load current. |
| Leakage Current (IR) | 0.1 µA max at VR = 12 V; enables low-quiescent-current bias networks without significant error contribution. |
| Thermal Resistance (RJL) | 150 °C/W junction-to-lead; allows accurate junction temperature estimation using lead temperature measurements. |
| ESD Rating | Class 3 (>16 kV) per HBM; supports robust handling in unshielded manufacturing and field-repair environments. |
Pinout & Package
SOD-123 surface-mount plastic package (1.60 × 2.69 × 1.16 mm), void-free thermosetting case with corrosion-resistant finish, cathode indicated by band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Reverse-biased Zener terminal | Connected to regulated voltage node; must be held at higher potential than anode during normal operation. |
| 2 (Anode) | Reference ground/reference return | Typically tied to system ground or lower-voltage rail; defines the reference point for Zener voltage measurement. |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating on FR-5 Board | Enables use in compact, cost-sensitive PCBs without forced-air cooling or oversized copper pours. |
| 17 Ω Zener Impedance at 7.8 mA | Delivers <±10 mV regulation shift across ±1 mA load current changes in feedback-sensing applications. |
| 0.1 µA Leakage at 12 V | Permits integration into micropower sensor bias chains where leakage would otherwise dominate quiescent current. |
| ESD Class 3 (>16 kV HBM) | Reduces need for external ESD protection in handheld and serviceable equipment interfaces. |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module Reference |
|---|---|
Use Scenario: Providing stable 16 V reference for op-amp-based bridge sensor amplifiers in factory-floor pressure transducers. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference establishing precise bias point for analog front-end gain stages. Use Value: ±5% VZ tolerance and 17 Ω ZZT ensure <±20 mV reference drift across temperature and supply variations. | Use Scenario: Clamping CAN transceiver supply rails against load-dump transients in door module ECUs. IC Role / Device Role / Timing Role: Overvoltage protection element absorbing surge energy during ISO 7637-2 Pulse 5a events. Use Value: 225 W peak pulse power rating and 150 °C/W RJL allow safe dissipation of 100 ms transients without thermal runaway. |
| Low-Power IoT Node Voltage Monitor | Medical Diagnostic Equipment Bias Supply |
Use Scenario: Monitoring battery voltage in BLE-enabled wearable devices using resistor-divider + ADC architecture. IC Role / Device Role / Timing Role: Precision Zener reference for ADC internal reference calibration and supply-rail monitoring. Use Value: 0.1 µA leakage at 12 V prevents measurable error in nanoampere-scale battery monitoring circuits. | Use Scenario: Generating stable bias for photodiode transimpedance amplifiers in portable ultrasound probe front-ends. IC Role / Device Role / Timing Role: Low-noise shunt regulator supplying clean 16 V to analog signal chain components. Use Value: 15.2–16.8 V range and 17 Ω ZZT support sub-millivolt baseline stability required for 16-bit medical-grade data acquisition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C16 | 16 V ±5%, 300 mW rating, SOD-323 package, 40 Ω ZZT at 5 mA | Lower power and higher impedance limit use in higher-current or tighter-regulation applications | Select when board space is more constrained than thermal or regulation performance requirements |
| MMBZ5246ET1 | Identical electrical specs but in SOT-23 package; 3-pin configuration with cathode/anode/NC or dual-anode variants | Requires different footprint and may introduce layout complexity due to extra pin | Choose only if existing SOT-23 land pattern is fixed and thermal design accommodates lower PD margin |
Compared with BZX584C16 and MMBZ5246ET1, the MMSZ5246ET1 offers superior thermal performance (150 °C/W RJL vs. ~200 °C/W typical for SOD-323) and lower dynamic impedance - making it preferred for applications demanding tighter voltage regulation under variable load or elevated ambient temperature.
Availability
MMSZ5246ET1 is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive body control modules, and low-power IoT voltage monitoring requiring stable component supply across multi-year production cycles.
Supply support for MMSZ5246ET1 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.
The MMSZ52xxET1G series is designed as general-purpose, medium-current Zener regulators for surface-mount voltage reference and overvoltage protection in space-constrained, high-reliability systems.
FAQ
What is the nominal Zener voltage of the MMSZ5246ET1 and how is it measured?
The MMSZ5246ET1 has a nominal Zener voltage of 16 V, with a guaranteed range of 15.2 V to 16.8 V at 7.8 mA test current (IZT). This value is measured under thermal equilibrium conditions at lead temperature TL = 30 °C ±1 °C, per onsemi's standard test methodology documented in the datasheet revision 10.
Does the MMSZ5246ET1 meet automotive qualification standards?
The MMSZ5246ET1 itself is not AEC-Q101 qualified; however, the SZMMSZ5246ET1G variant - which shares identical electrical characteristics - is AEC-Q101 qualified and PPAP capable. Engineers selecting for automotive applications should specify the SZ-prefix version to ensure compliance with automotive reliability and change-control requirements.
What is the maximum allowable soldering temperature for the MMSZ5246ET1?
The MMSZ5246ET1 has a maximum soldering temperature of 260 °C for 10 seconds, as specified in the mechanical characteristics section of the onsemi datasheet. This aligns with standard lead-free reflow profiles and ensures no degradation of the void-free thermosetting plastic case or corrosion-resistant finish.
How does the MMSZ5246ET1 behave under transient surge conditions?
The MMSZ5246ET1 supports nonrepetitive surge pulses up to 225 W for 8 × 20 µs waveform (per Figure 11), enabling robust overvoltage protection in environments subject to ISO 7637-2 or IEC 61000-4-5 transients. Its 150 °C/W junction-to-lead thermal resistance helps dissipate short-duration energy without exceeding 150 °C junction temperature.
Is the MMSZ5246ET1 RoHS-compliant and what does the 'G' suffix indicate?
Yes, the MMSZ5246ET1 is RoHS-compliant and Pb-free. The 'G' suffix in the full orderable part number MMSZ5246ET1G explicitly denotes the Pb-free package; the base part number MMSZ5246ET1 refers to the same device family and is commonly used interchangeably in documentation, though ordering requires the 'G' suffix for compliant material.
MMSZ5246ET1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 16 V
- Tolerance:
- ±5%
- Power - Max:
- 500 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:
- SOD-123
MMSZ5246ET1 FAQ
1.How can I place an order for MMSZ5246ET1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5246ET1 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 MMSZ5246ET1 reliable?
The price and inventory of MMSZ5246ET1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5246ET1 is usually 5 days.
3.What payment methods are accepted for MMSZ5246ET1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5246ET1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5246ET1?
MMSZ5246ET1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5246ET1 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 MMSZ5246ET1?
For technical support, including MMSZ5246ET1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5246ET1 requirements.
6.How does Aetrix verify that MMSZ5246ET1 is sourced from the original manufacturer or authorized distributors?
All MMSZ5246ET1 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 MMSZ5246ET1 meets industry standards.
7.What is the process for return or replacement of MMSZ5246ET1?
All MMSZ5246ET1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5246ET1, 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 MMSZ5246ET1 part is unused and in its original packaging.
Return procedure for MMSZ5246ET1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5246ET1 Tags
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