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onsemi MMSZ5246BT1
- Part No.:
- MMSZ5246BT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5246BT1.pdf
- Description:
- DIODE ZENER 16V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,875
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Product details
Overview
MMSZ5246BT1 from ON Semiconductor is a 500 mW, ±5% tolerance Zener diode in SOD−123 package, rated for 16 V nominal reverse breakdown voltage at 7.8 mA test current, with 600 Ω maximum dynamic impedance and 0.1 µA leakage at 12 V reverse bias-used for precision voltage reference and overvoltage protection in low-power analog and power management circuits.
For engineers reviewing the MMSZ5246BT1 datasheet, pinout, applications, or equivalent options, this device serves as a surface-mount, automotive-grade (AEC−Q101 qualified) voltage clamp with ESD robustness (>16 kV HBM), thermal equilibrium–specified Zener voltage, and FR−4/FR−5 board–rated power dissipation.
Technical Context
The MMSZ5246BT1 operates as a two-terminal silicon Zener regulator, maintaining stable reverse-bias voltage across its cathode–anode terminals when biased above its specified Zener knee current (IZK = 7.8 mA). Its junction temperature range spans −55°C to +150°C, and it exhibits a positive temperature coefficient typical of mid-voltage Zeners (~+5.5 mV/°C near 16 V).
It is characterized under thermal equilibrium conditions (TL = 30°C ±1°C), with Zener voltage measured at IZT = 7.8 mA and dynamic impedance ZZT tested at 1 kHz AC signal superimposed on DC bias. Leakage current IR is specified at VR = 12 V, well below nominal VZ, ensuring low standby power loss in clamping applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 15.2 V min / 16.0 V nom / 16.8 V max @ IZT = 7.8 mA - defines precise clamping threshold for voltage regulation or transient suppression |
| Power Dissipation | 500 mW on FR−5 board @ TL = 75°C - sets maximum continuous thermal load without derating |
| Zener Impedance | 600 Ω max @ IZT - determines output voltage stability under varying load current |
| Leakage Current | 0.1 µA max @ VR = 12 V - ensures minimal quiescent current in high-impedance bias networks |
| Tolerance | ±5% - specifies allowable deviation from nominal 16 V for production yield and circuit margining |
| ESD Rating | Class 3 (>16 kV HBM) - enables robust handling in automated assembly and end-use environments |
| Junction Temp Range | −55°C to +150°C - supports operation in automotive under-hood and industrial control applications |
Pinout & Package
SOD−123 plastic surface-mount package (Case 425, Style 1), void-free thermosetting epoxy case with corrosion-resistant, solderable finish; polarity indicated by cathode band; 260°C max soldering temperature for 10 seconds; UL 94 V−0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Reverse-bias terminal | Connected to higher-potential node in Zener clamp configuration; carries reverse current during regulation |
| 2 (Anode) | Reference/ground terminal | Typically tied to system ground or low-side reference; completes current path during Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Thermal-equilibrium Zener spec | VZ guaranteed at TL = 30°C ±1°C - eliminates thermal drift uncertainty in precision reference designs |
| Automotive qualification | AEC−Q101 qualified and PPAP capable - meets reliability requirements for automotive electronics |
| High-density packaging | SOD−123 footprint (2.54 mm × 1.35 mm) - enables compact PCB layouts in space-constrained modules |
| Pb−Free construction | RoHS-compliant, halogen-free materials - satisfies global environmental compliance and lead-free soldering standards |
| Medium-current capability | Rated for up to 20 mA Zener test current - suitable for biasing, feedback, and low-power regulation tasks |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) Voltage Clamp |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature/humidity sensor nodes. IC Role / Device Role / Timing Role: Zener voltage reference providing fixed 16 V rail for op-amp biasing and ADC reference scaling. Use Value: Tight ±5% VZ tolerance and low 0.1 µA leakage ensure <0.5% full-scale error contribution and negligible battery drain in always-on sensing. | Use Scenario: Protecting microcontroller I/O pins from load-dump transients in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Fast-acting shunt clamp absorbing surge energy before voltage exceeds MCU absolute maximum ratings. Use Value: 500 mW power rating and AEC−Q101 qualification enable reliable transient suppression without external TVS cascading. |
| Low-Power IoT Node Power Management | Programmable Logic Controller (PLC) Input Protection |
Use Scenario: Regulating auxiliary 16 V supply for RF transceiver bias in battery-powered edge devices. IC Role / Device Role / Timing Role: Passive voltage regulator replacing active LDO where ultra-low quiescent current is critical. Use Value: 0.1 µA leakage at 12 V reverse bias extends coin-cell battery life beyond 5 years in sleep mode. | Use Scenario: Clamping field-side 24 V digital input signals to safe levels before optocoupler isolation stage. IC Role / Device Role / Timing Role: Primary overvoltage protector limiting input voltage to ≤16.8 V under fault conditions. Use Value: 600 Ω dynamic impedance ensures minimal voltage rise during fast-rising surges, preserving input logic integrity. |
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-C16 | Same 16 V nominal Zener, but SOT−23 package (larger footprint), 350 mW rating, ±5% tolerance | Lower power handling and different thermal resistance (RJA = 350°C/W vs. 340°C/W); less suited for high-density layouts | Select BZX84-C16 only if SOT−23 compatibility or legacy footprint reuse is required; MMSZ5246BT1 offers superior density and thermal performance. |
| MMSZ5246ET1G | Identical electrical specs, but ±2% tolerance version (marked "E" suffix), same SOD−123 package | Higher precision for reference-critical circuits; tighter VZ distribution improves batch-to-batch consistency | Choose MMSZ5246ET1G when voltage accuracy >±5% is mandatory; MMSZ5246BT1 remains optimal for cost-sensitive general-purpose clamping. |
Compared with BZX84-C16 and MMSZ5246ET1G, the MMSZ5246BT1 balances cost, size, and specification compliance-offering SOD−123 miniaturization, AEC−Q101 qualification, and 500 mW dissipation unmatched by SOT−23 alternatives, while delivering sufficient accuracy for non-critical regulation without premium tolerance pricing.
Availability
MMSZ5246BT1 is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive voltage clamping, and low-power IoT node power management requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MMSZ5246BT1 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
ON Semiconductor (now onsemi) is a global semiconductor supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MMSZ52xxxT1G series was designed for surface-mount, medium-current Zener regulation in space-constrained, thermally demanding applications-including automotive ECUs, industrial PLCs, and portable electronics-where reliability, small footprint, and AEC−Q101 compliance are essential.
FAQ
What is the nominal Zener voltage and test current for MMSZ5246BT1?
The MMSZ5246BT1 has a nominal Zener voltage of 16.0 V, specified at a test current (IZT) of 7.8 mA under thermal equilibrium conditions (TL = 30°C ±1°C). This value is guaranteed within a min/max range of 15.2 V to 16.8 V at the same test condition, reflecting its ±5% tolerance grade. The MMSZ5246BT1 datasheet confirms this in the 5% tolerance electrical characteristics table on page 3.
Is MMSZ5246BT1 suitable for automotive applications?
Yes, the MMSZ5246BT1 is AEC−Q101 qualified and PPAP capable, making it suitable for automotive applications including body control modules, infotainment power rails, and sensor interface protection. Its construction includes Pb−free materials, Class 3 ESD robustness (>16 kV HBM), and operation across −55°C to +150°C junction temperature-fully meeting automotive reliability requirements. The MMSZ5246BT1 product family is explicitly designated for such use cases in the official ON Semiconductor documentation.
What is the maximum power dissipation and derating behavior of MMSZ5246BT1?
The MMSZ5246BT1 delivers 500 mW total power dissipation on FR−5 board at TL = 75°C, with linear derating of 6.7 mW/°C above that temperature. Its thermal resistance junction-to-ambient (RJA) is 340°C/W, and junction-to-lead (RJL) is 150°C/W-measured via infrared scan method. These values define safe operating limits for continuous DC or pulsed operation; exceeding them risks parametric shift or permanent damage. The MMSZ5246BT1 datasheet specifies these in the Maximum Ratings table on page 2.
How does the leakage current of MMSZ5246BT1 compare to similar Zeners?
The MMSZ5246BT1 exhibits a maximum reverse leakage current (IR) of 0.1 µA at VR = 12 V, which is significantly lower than many competing 16 V Zeners rated at 1 µA or higher under comparable conditions. This low leakage directly reduces standby power in battery-operated systems and improves accuracy in high-impedance bias networks. The MMSZ5246BT1 achieves this performance through optimized silicon processing and thermal-equilibrium characterization, as confirmed in the Electrical Characteristics table on page 3.
What package type and marking code does MMSZ5246BT1 use?
The MMSZ5246BT1 uses the SOD−123 surface-mount plastic package (Case 425, Style 1), with cathode identified by a polarity band. Its device marking is "J1", as listed in the Electrical Characteristics table on page 3 of the datasheet. This marking appears laser-etched or molded on the cathode end of the package and corresponds uniquely to the 16 V ±5% variant within the MMSZ52xxxT1G series. The MMSZ5246BT1 mechanical dimensions and footprint are fully detailed in the Package Dimensions section on page 7.
MMSZ5246BT1 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
MMSZ5246BT1 FAQ
1.How can I place an order for MMSZ5246BT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5246BT1 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 MMSZ5246BT1 reliable?
The price and inventory of MMSZ5246BT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5246BT1 is usually 5 days.
3.What payment methods are accepted for MMSZ5246BT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5246BT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5246BT1?
MMSZ5246BT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5246BT1 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 MMSZ5246BT1?
For technical support, including MMSZ5246BT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5246BT1 requirements.
6.How does Aetrix verify that MMSZ5246BT1 is sourced from the original manufacturer or authorized distributors?
All MMSZ5246BT1 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 MMSZ5246BT1 meets industry standards.
7.What is the process for return or replacement of MMSZ5246BT1?
All MMSZ5246BT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5246BT1, 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 MMSZ5246BT1 part is unused and in its original packaging.
Return procedure for MMSZ5246BT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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