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onsemi MMSZ5248BT3
- Part No.:
- MMSZ5248BT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5248BT3.pdf
- Description:
- DIODE ZENER 18V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:7,174
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Product details
Overview
MMSZ5248BT3 from onsemi is a 5% tolerance, 18 V nominal Zener voltage regulator diode in SOD−123 surface-mount package, rated for 500 mW power dissipation at 75°C on FR−5 board, with 7.0 mA test current (IZT), 21 Ω dynamic impedance (ZZT), and 0.1 µA reverse leakage at 14 V (VR). It serves as a precision voltage reference or overvoltage clamp in low-power analog circuits, DC-DC feedback loops, and ESD-protected sensor interfaces.
For engineers reviewing the MMSZ5248BT3 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, SOD−123 terminal mapping, and validated alternative options for voltage regulation design-in.
Technical Context
The MMSZ5248BT3 operates as a silicon planar Zener diode with controlled avalanche breakdown at 18 V nominal, specified under thermal equilibrium conditions (TL = 30°C ±1°C). Its 21 Ω Zener impedance at 7.0 mA IZT ensures stable regulation under moderate load transients, while its 0.1 µA IR at 14 V VR confirms tight leakage control for battery-powered systems.
Designed for automated assembly, it features Pb−free plating, UL 94 V−0 flammability rating, and 260°C/10s soldering tolerance. The device meets AEC−Q101 requirements when ordered with SZ prefix, though MMSZ5248BT3 itself is a commercial-grade variant with Class 3 ESD rating (>16 kV HBM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1–18.9 V @ IZT = 7.0 mA - defines regulated output range for feedback or clamping |
| Power Dissipation (PD) | 500 mW @ TL = 75°C - sets maximum steady-state thermal load on PCB |
| Zener Impedance (ZZT) | 21 Ω @ IZT = 7.0 mA - determines output voltage variation under current step changes |
| Reverse Leakage (IR) | 0.1 µA @ VR = 14 V - ensures minimal quiescent current in high-impedance bias networks |
| Thermal Resistance (RJA) | 340 °C/W - indicates required PCB copper area for safe operation above ambient |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct placement near I/O pins without external protection |
| Junction Temp Range | −55°C to +150°C - supports industrial and automotive under-hood applications |
Pinout & Package
SOD−123 plastic surface-mount package (Case 425, Style 1), cathode indicated by polarity band; dimensions: 2.84 mm × 1.35 mm × 0.94 mm (L × W × H); optimized for high-density automated placement.
| 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 bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables use in medium-current references without heatsinking on standard FR−5 PCB |
| ±5% Zener Tolerance | Provides cost-effective voltage accuracy for non-critical regulation and clamping |
| Class 3 ESD Protection | Eliminates need for discrete TVS in many I/O protection schemes |
| Pb−Free & RoHS Compliant | Meets global environmental compliance without performance trade-offs |
| Thermal Equilibrium Spec | Ensures VZ stability across production lots and operating temperatures |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature transmitter modules. IC Role / Device Role / Timing Role: Zener voltage reference providing 18 V rail for op-amp bias and ADC reference buffer. Use Value: Tight 21 Ω ZZT minimizes code-to-code variation under supply ripple; 0.1 µA IR prevents loading of high-Z sensor bridges. | Use Scenario: Protecting USB 2.0 data lines from 24 V industrial field transients. IC Role / Device Role / Timing Role: Low-capacitance shunt clamp limiting line voltage to 18.9 V before ESD diode array. Use Value: 16 kV HBM rating absorbs multiple ESD events; SOD−123 footprint fits tight 0.5 mm pitch routing. |
| Low-Power IoT Node Voltage Monitor | DC-DC Converter Feedback Divider |
Use Scenario: Detecting brown-out condition in coin-cell–powered BLE beacon using resistor divider into MCU ADC. IC Role / Device Role / Timing Role: Precision Zener establishing threshold voltage for wake-up comparator input. Use Value: −55°C to +150°C junction range ensures reliability across outdoor deployments; 7.0 mA IZT matches typical divider current. | Use Scenario: Setting output voltage of 3.3 V buck converter via feedback network with 18 V Zener in series. IC Role / Device Role / Timing Role: Secondary reference stabilizing upper resistor node against input ripple. Use Value: 340 °C/W RJA allows thermal coupling to power inductor; 500 mW rating handles transient overshoot energy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5248CT3G | ±2% tolerance (17.64–18.36 V), same SOD−123 package and 7.0 mA IZT | Higher accuracy needed for precision feedback or calibration circuits | Select when tighter VZ stability outweighs cost premium |
| BZX84-C18LT1G | Same 18 V nominal, ±5% tolerance, but 300 mW rating and 40 Ω ZZT @ 5 mA | Lower power budget or less stringent impedance requirements | Choose for space-constrained designs where 500 mW headroom is unnecessary |
Compared with MMSZ5248BT3, MMSZ5248CT3G offers improved voltage accuracy at identical thermal and layout compatibility, while BZX84-C18LT1G trades power handling and impedance performance for smaller footprint and lower cost in non-critical regulation roles.
Availability
MMSZ5248BT3 is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port protection, low-power IoT monitoring, and DC-DC feedback applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MMSZ5248BT3 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 management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MMSZ52xxxT1G Series targets cost-sensitive, high-volume voltage regulation needs in compact surface-mount designs, emphasizing thermal stability, ESD robustness, and Pb−free manufacturability.
FAQ
What is the nominal Zener voltage and tolerance of the MMSZ5248BT3?
The MMSZ5248BT3 has a nominal Zener voltage of 18 V with a ±5% tolerance, meaning its actual breakdown voltage falls between 17.1 V and 18.9 V when measured at 7.0 mA test current (IZT) under thermal equilibrium conditions. This tolerance is confirmed in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table on page 3 of the official datasheet, and applies specifically to the "B" suffix devices like MMSZ5248BT3.
What is the maximum power dissipation rating for MMSZ5248BT3 and under what conditions?
The MMSZ5248BT3 is rated for 500 mW total power dissipation on an FR−5 board at a lead temperature (TL) of 75°C, with linear derating of 6.7 mW/°C above that temperature. This rating assumes use of the minimum recommended SOD−123 footprint and accounts for thermal resistance of 340 °C/W (junction-to-ambient) and 150 °C/W (junction-to-lead), as specified in the Maximum Ratings table on page 2 of the datasheet.
Does MMSZ5248BT3 have automotive qualification, and what does the "SZ" prefix indicate?
The MMSZ5248BT3 itself is not automotive-qualified; however, the SZMMSZ5248BT3 variant carries the "SZ" prefix and is AEC−Q101 qualified and PPAP capable. The "SZ" prefix denotes devices manufactured under automotive-specific site controls and change management protocols, while MMSZ5248BT3 is the commercial-grade version intended for industrial and general-purpose applications.
What is the reverse leakage current specification for MMSZ5248BT3, and at what voltage is it measured?
The MMSZ5248BT3 exhibits a maximum reverse leakage current (IR) of 0.1 µA at a reverse voltage (VR) of 14 V, as stated in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table on page 3. This parameter is critical for low-power applications such as battery-operated sensors, where even nanoamp-level leakage can impact operational lifetime.
How is the Zener impedance (ZZT) of MMSZ5248BT3 defined, and why does it matter in circuit design?
The Zener impedance (ZZT) of MMSZ5248BT3 is 21 Ω, measured at 7.0 mA test current (IZT) with a 1 kHz AC signal amplitude equal to 0.1 × IZT. This value quantifies how much the Zener voltage varies with current changes-lower ZZT means better regulation stability under dynamic load conditions, making MMSZ5248BT3 suitable for feedback networks and precision references where supply ripple rejection matters.
MMSZ5248BT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 500 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:
- SOD-123
MMSZ5248BT3 FAQ
1.How can I place an order for MMSZ5248BT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5248BT3 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 MMSZ5248BT3 reliable?
The price and inventory of MMSZ5248BT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5248BT3 is usually 5 days.
3.What payment methods are accepted for MMSZ5248BT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5248BT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5248BT3?
MMSZ5248BT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5248BT3 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 MMSZ5248BT3?
For technical support, including MMSZ5248BT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5248BT3 requirements.
6.How does Aetrix verify that MMSZ5248BT3 is sourced from the original manufacturer or authorized distributors?
All MMSZ5248BT3 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 MMSZ5248BT3 meets industry standards.
7.What is the process for return or replacement of MMSZ5248BT3?
All MMSZ5248BT3 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5248BT3, 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 MMSZ5248BT3 part is unused and in its original packaging.
Return procedure for MMSZ5248BT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5248BT3 Tags
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