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onsemi MMSZ5246BT3G
- Part No.:
- MMSZ5246BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5246BT3G.pdf
- Description:
- DIODE ZENER 16V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:7,613
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Product details
Overview
MMSZ5246BT3G from onsemi is a 16 V ±5% Zener diode in SOD−123 package, rated for 500 mW power dissipation on FR−5 board at 75°C, with 7.8 mA test current (IZT), 17 Ω dynamic impedance (ZZT), and 0.1 µA reverse leakage at 12 V (IR). It serves as a precision voltage reference or overvoltage clamp in low-power analog and digital supply rails.
For engineers reviewing the MMSZ5246BT3G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, SOD−123 terminal mapping, and validated alternative parts for voltage regulation in space-constrained PCB designs.
Technical Context
The MMSZ5246BT3G operates as a silicon planar Zener diode with controlled avalanche breakdown at nominal 16 V, specified under thermal equilibrium conditions (TL = 30°C ±1°C). Its 5% tolerance and 17 Ω Zener impedance at 7.8 mA ensure stable regulation in feedback loops and reference circuits.
It exhibits a positive temperature coefficient near 16 V (≈+5.5 mV/°C per typical curve data), supports ESD robustness >16 kV HBM, and maintains ≤0.1 µA leakage at VR = 12 V - enabling reliable operation in battery-powered sensors and industrial I/O protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 15.2–16.8 V @ IZT = 7.8 mA - defines regulated output range for voltage reference or clamping |
| Power Dissipation (PD) | 500 mW @ TL = 75°C - sets maximum steady-state thermal load on FR−5 PCB |
| Zener Impedance (ZZT) | 17 Ω @ IZT = 7.8 mA - determines AC regulation error under varying load current |
| Reverse Leakage (IR) | 0.1 µA @ VR = 12 V - ensures minimal quiescent current in high-impedance bias networks |
| Thermal Resistance (RJA) | 340 °C/W - indicates junction-to-ambient heat transfer efficiency on standard PCB |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct interface with exposed connectors without external protection |
| Junction Temp Range | −55°C to +150°C - supports operation in automotive under-hood and industrial control environments |
Pinout & Package
SOD−123 surface-mount plastic package (Case 425, Style 1), void-free thermosetting epoxy, cathode indicated by band. Dimensions: 2.84 mm × 1.35 mm × 0.94 mm (L × W × H), 0.100″ pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased during Zener operation |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential rail; completes conduction path during breakdown |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables use in medium-current regulation without heatsinking on standard FR−5 PCB |
| Pb−Free & RoHS Compliant | Meets global environmental compliance requirements for consumer and industrial end equipment |
| Automated Assembly Optimized | Flat, coplanar leads and defined footprint support high-yield pick-and-place and reflow |
| High-Density Packaging | SOD−123 footprint (2.84 mm × 1.35 mm) allows placement in tight layout spaces |
| AEC−Q101 Qualified (SZ variant) | Validated reliability for automotive applications; base MMSZ5246BT3G shares process and structure |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADCs in temperature/humidity transmitters operating from 3.3 V or 5 V rails. IC Role / Device Role / Timing Role: Zener voltage reference providing stable 16 V bias for op-amp gain-setting or DAC reference scaling. Use Value: Tight 5% tolerance and low 17 Ω ZZT minimize code-to-code variation across temperature and supply drift. |
Use Scenario: Clamping transient surges on USB VBUS line during hot-plug events or ESD discharge. IC Role / Device Role / Timing Role: Standby-mode shunt protector activated only above 16 V threshold, diverting surge energy to ground. Use Value: 0.1 µA IR at 12 V ensures no loading of nominal VBUS; 16 V clamping avoids false disconnects during normal 4.75–5.25 V operation. |
| Low-Power IoT Node Power Management | Programmable Logic Supply Clamp |
Use Scenario: Regulating auxiliary 16 V rail for RF front-end bias in battery-operated LoRaWAN gateways. IC Role / Device Role / Timing Role: Passive voltage regulator supplying constant bias to GaAs FET amplifiers with low quiescent current demand. Use Value: −55°C to +150°C junction range and 340 °C/W RJA allow operation in unheated outdoor enclosures with passive cooling. |
Use Scenario: Preventing latch-up in FPGA I/O banks powered from 3.3 V or 2.5 V supplies during configuration glitches. IC Role / Device Role / Timing Role: Fast-acting clamp limiting voltage overshoot to ≤16 V during power sequencing faults or cross-talk spikes. Use Value: 16 V clamping threshold exceeds typical I/O absolute max ratings (e.g., 3.6 V for 3.3 V banks), providing margin before damage. |
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-C16LT1G | Same 16 V ±5%, but SOT−23 package (larger footprint, higher RJA ≈ 380 °C/W), 350 mW rating | Lower power handling and less thermal efficiency; suitable only where board space permits larger outline | Select when legacy SOT−23 footprint compatibility is required and thermal margin ≥10°C exists |
| MMSZ5246ET3G | Identical electrical specs and SOD−123 package, but ±2% tolerance (tighter regulation), higher cost | Used where reference stability <±0.32 V is mandatory, e.g., precision DAC buffers or calibration circuits | Select when tighter voltage accuracy justifies premium pricing and thermal performance must remain unchanged |
Compared with MMSZ5246BT3G, BZX84-C16LT1G trades thermal performance for package familiarity, while MMSZ5246ET3G improves regulation accuracy without altering thermal or mechanical design - making it ideal for metrology-grade subsystems requiring traceable voltage references.
Availability
MMSZ5246BT3G is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB port overvoltage protection, and low-power IoT node power management requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for MMSZ5246BT3G 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MMSZ52xxxT1G series was designed for general-purpose, medium-current Zener regulation in space-constrained surface-mount applications - emphasizing manufacturability, thermal reliability, and broad voltage coverage from 2.4 V to 110 V.
FAQ
What is the nominal Zener voltage and tolerance of the MMSZ5246BT3G?
The MMSZ5246BT3G has a nominal Zener voltage of 16 V with a ±5% tolerance, meaning its actual breakdown voltage falls between 15.2 V and 16.8 V when measured at IZT = 7.8 mA under thermal equilibrium conditions (TL = 30°C ±1°C). This tolerance is confirmed in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table on page 3 of the official datasheet.
What is the maximum power dissipation rating for the MMSZ5246BT3G, and how does it derate with temperature?
The MMSZ5246BT3G is rated for 500 mW total power dissipation on an FR−5 board at TL = 75°C, derating linearly at 6.7 mW/°C above that temperature. Its thermal resistance junction-to-ambient (RJA) is 340 °C/W, meaning junction temperature rises significantly with ambient or board temperature - requiring careful thermal design in enclosed or high-temperature environments.
Does the MMSZ5246BT3G have automotive qualification, and what does that mean for industrial use?
The base MMSZ5246BT3G is not AEC−Q101 qualified, but its SZ-prefix variant (SZMMSZ5246BT3G) is. Both share identical electrical and mechanical specifications; the SZ version undergoes additional process controls and PPAP documentation. For industrial applications demanding extended temperature operation (−55°C to +150°C) and long-term reliability, the MMSZ5246BT3G meets those requirements even without formal automotive certification.
How is the cathode identified on the MMSZ5246BT3G SOD−123 package?
The cathode of the MMSZ5246BT3G is marked by a distinct polarity band at one end of the SOD−123 package - consistent with industry-standard marking for Zener diodes. Pin 1 (cathode) must be connected to the higher-potential node in reverse-bias configuration; incorrect orientation will result in forward conduction (~0.95 V drop) instead of Zener regulation.
What is the reverse leakage current specification for the MMSZ5246BT3G, and at what voltage is it measured?
The MMSZ5246BT3G specifies a maximum reverse leakage current (IR) of 0.1 µA at VR = 12 V, measured at TA = 25°C. This low leakage ensures minimal parasitic loading in high-impedance reference divider networks and makes the device suitable for battery-critical applications where standby current must be tightly constrained.
MMSZ5246BT3G 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
MMSZ5246BT3G FAQ
1.How can I place an order for MMSZ5246BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5246BT3G 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 MMSZ5246BT3G reliable?
The price and inventory of MMSZ5246BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5246BT3G is usually 5 days.
3.What payment methods are accepted for MMSZ5246BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5246BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5246BT3G?
MMSZ5246BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5246BT3G 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 MMSZ5246BT3G?
For technical support, including MMSZ5246BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5246BT3G requirements.
6.How does Aetrix verify that MMSZ5246BT3G is sourced from the original manufacturer or authorized distributors?
All MMSZ5246BT3G 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 MMSZ5246BT3G meets industry standards.
7.What is the process for return or replacement of MMSZ5246BT3G?
All MMSZ5246BT3G units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5246BT3G, 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 MMSZ5246BT3G part is unused and in its original packaging.
Return procedure for MMSZ5246BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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