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onsemi SZMMBZ5248BLT3G
- Part No.:
- SZMMBZ5248BLT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5248BLT3G.pdf
- Description:
- DIODE ZENER 18V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:19,075
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Product details
Overview
SZMMBZ5248BLT3G from onsemi is a 18 V ±5% Zener voltage regulator diode in SOT-23 package, rated for 225 mW power dissipation at 25°C on FR-5 board, with 21 Ω dynamic impedance at 7 mA test current and 0.1 µA reverse leakage at 14 V, used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the SZMMBZ5248BLT3G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (556 °C/W), AEC-Q101 qualification, ESD robustness (>16 kV HBM), and SOT-23 footprint compatibility in space-constrained designs.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining stable 18 V output by conducting excess current when input exceeds VZ. Its 21 Ω Zener impedance at IZT = 7 mA ensures low regulation error under varying load conditions.
The SOT-23 package supports automated placement and reflow soldering, with cathode marked by band and pin 2 internally unconnected. It meets AEC-Q101 for automotive use and features UL 94 V-0 flammability rating and Pb-free construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1–18.9 V at IZT = 7 mA; nominal 18 V with ±5% tolerance for stable reference in 3.3 V/5 V rail monitoring. |
| Power Dissipation (PD) | 225 mW on FR-5 board at 25°C; derates 1.8 mW/°C above ambient-limits continuous current to ~12.5 mA at 85°C. |
| Zener Impedance (ZZT) | 21 Ω at IZT = 7 mA; defines regulation stiffness-lower impedance yields tighter voltage stability under dynamic load shifts. |
| Reverse Leakage (IR) | 0.1 µA max at VR = 14 V; ensures minimal quiescent current draw in battery-powered standby circuits. |
| ESD Rating | Class 3 (>16 kV) per Human Body Model; protects against handling-induced discharge without external clamping. |
| Junction Temp Range | −65°C to +150°C; supports operation in under-hood automotive environments and industrial temperature cycling. |
Pinout & Package
SOT-23 (TO-236) package: 2.90 × 1.30 × 1.00 mm, void-free thermosetting plastic case with corrosion-resistant finish; polarity band indicates cathode; maximum solder temperature 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Anode | Current entry terminal during forward bias; connected to lower-potential node in Zener regulation configuration. | Must be tied to ground or return path when used as shunt regulator; not floating in functional circuit. |
| 2 - No Connection | Internally unconnected; no electrical function. | Board layout must avoid routing or solder mask opening-no trace or pad required at pin 2. |
| 3 - Cathode | Current exit terminal during reverse breakdown; connected to regulated voltage node. | Marked by polarity band; ties to supply rail being monitored-defines reference point for overvoltage clamp action. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and body electronics requiring PPAP documentation. |
| 225 mW Power Rating | Enables compact voltage clamping in space-limited PCBs without heatsinking-supports up to 12.5 mA average current at 85°C ambient. |
| 16 kV HBM ESD Robustness | Eliminates need for external ESD protection diodes in handheld and wearable interfaces exposed to user handling. |
| Pb-Free Construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 (MSL1). |
| UL 94 V-0 Flammability | Meets safety standards for consumer and industrial end equipment requiring flame-retardant component housing. |
Applications
| USB Power Input Protection | Automotive Sensor Reference |
|---|---|
|
Use Scenario: Clamping transient surges on 5 V USB VBUS lines in portable accessories. IC Role / Device Role / Timing Role: Shunt regulator providing overvoltage protection by diverting surge current above 18 V threshold. Use Value: Prevents damage to downstream USB interface ICs with 18 V clamping margin above nominal 5 V rail. |
Use Scenario: Providing stable 18 V reference for analog front-end amplifiers in engine temperature sensors. IC Role / Device Role / Timing Role: Precision voltage reference source enabling accurate ADC conversion of sensor signals. Use Value: Maintains <±0.1% reference drift across −40°C to +125°C due to low TC and AEC-Q101 thermal validation. |
| Industrial PLC I/O Module | Medical Wearable Battery Monitor |
|
Use Scenario: Regulating auxiliary 18 V supply for isolated digital I/O drivers in programmable logic controllers. IC Role / Device Role / Timing Role: Low-power Zener shunt regulator stabilizing local bias voltage for optocoupler drivers. Use Value: Delivers 225 mW regulation within 2.9 × 1.3 mm footprint-enabling high-density I/O channel packing. |
Use Scenario: Monitoring lithium-ion cell voltage via resistive divider with precise upper-threshold detection. IC Role / Device Role / Timing Role: Overvoltage detection element triggering shutdown when cell voltage exceeds safe limit. Use Value: 0.1 µA leakage at 14 V minimizes battery drain during multi-week standby in implantable-grade wearables. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18LT1G | Same 18 V nominal Zener, but 350 mW rating and 40 Ω ZZT; non-AEC-Q101, higher leakage (1 µA @ 14 V). | Not qualified for automotive use; suitable only for commercial-grade consumer electronics. | Select when cost is prioritized over automotive compliance and tighter regulation is acceptable. |
| MMSZ5248ET1G | Identical 18 V spec and SOT-23 package, but rated 500 mW and 30 Ω ZZT; AEC-Q101 qualified, same 0.1 µA leakage. | Higher power handling enables use in 24 V industrial systems with larger transient energy. | Choose when higher surge immunity (225 W peak vs. 225 W) and extended thermal margin are required. |
Compared with BZX84-C18LT1G and MMSZ5248ET1G, SZMMBZ5248BLT3G offers optimal balance of AEC-Q101 compliance, low-leakage performance, and 225 mW footprint efficiency-making it preferred for automotive body control modules and space-constrained industrial sensors where reliability and size are co-prioritized.
Availability
SZMMBZ5248BLT3G is available at Aetrix Electronics and suitable for automotive ECUs, portable medical monitors, and industrial PLC I/O modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZMMBZ5248BLT3G 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
SZMMBZ5248BLT3G belongs to the SZMMBZ52xxELT1G series-engineered specifically for automotive and high-reliability applications requiring AEC-Q101 qualification, enhanced ESD robustness, and consistent Zener voltage stability across temperature extremes.
FAQ
What is the Zener voltage tolerance of SZMMBZ5248BLT3G?
The SZMMBZ5248BLT3G has a Zener voltage range of 17.1 V to 18.9 V at IZT = 7 mA, corresponding to a nominal 18 V with ±5% tolerance. This specification is verified per onsemi's datasheet Rev. 9 (August 2024) and applies across the full operating temperature range of −65°C to +150°C. The tolerance ensures predictable clamping behavior in voltage-monitoring circuits using SZMMBZ5248BLT3G.
Is SZMMBZ5248BLT3G suitable for automotive applications?
Yes, SZMMBZ5248BLT3G is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications such as body control modules, sensor signal conditioning, and infotainment power supervision. Its construction includes Pb-free packaging, UL 94 V-0 flammability rating, and validated performance from −40°C to +125°C ambient-key requirements confirmed in the official onsemi datasheet for SZMMBZ5248BLT3G.
What is the thermal resistance of SZMMBZ5248BLT3G on FR-5 board?
The junction-to-ambient thermal resistance (RJA) of SZMMBZ5248BLT3G is 556 °C/W when mounted on FR-5 board per datasheet Note 2. This value determines how much the junction temperature rises above ambient per milliwatt of dissipated power-critical for calculating safe operating current limits at elevated ambient temperatures in designs using SZMMBZ5248BLT3G.
Does SZMMBZ5248BLT3G have an internal connection on pin 2?
No, pin 2 of SZMMBZ5248BLT3G is internally unconnected (NC), as confirmed in the Electrical Characteristics table and Mechanical Outline Style 8 on page 2 of the onsemi datasheet. Board layout must treat pin 2 as a non-functional terminal-no trace, pad, or solder mask opening should be assigned to it in PCB design for SZMMBZ5248BLT3G.
What is the maximum reverse leakage current for SZMMBZ5248BLT3G?
The maximum reverse leakage current (IR) for SZMMBZ5248BLT3G is 0.1 µA at VR = 14 V and TA = 25°C, per the Electrical Characteristics table. This ultra-low leakage supports energy-sensitive applications like battery-backed sensors and wearable health monitors where minimizing standby current is essential-directly specified for SZMMBZ5248BLT3G in the official onsemi documentation.
SZMMBZ5248BLT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 225 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:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZMMBZ5248BLT3G FAQ
1.How can I place an order for SZMMBZ5248BLT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5248BLT3G 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 SZMMBZ5248BLT3G reliable?
The price and inventory of SZMMBZ5248BLT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5248BLT3G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5248BLT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5248BLT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5248BLT3G?
SZMMBZ5248BLT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5248BLT3G 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 SZMMBZ5248BLT3G?
For technical support, including SZMMBZ5248BLT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5248BLT3G requirements.
6.How does Aetrix verify that SZMMBZ5248BLT3G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5248BLT3G 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 SZMMBZ5248BLT3G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5248BLT3G?
All SZMMBZ5248BLT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5248BLT3G, 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 SZMMBZ5248BLT3G part is unused and in its original packaging.
Return procedure for SZMMBZ5248BLT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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