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onsemi SZMMBZ5248BLT1G
- Part No.:
- SZMMBZ5248BLT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5248BLT1G.pdf
- Description:
- DIODE ZENER 18V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:11,995
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Product details
Overview
SZMMBZ5248BLT1G from onsemi is a 18 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 7 mA test current, 21 Ω dynamic impedance at IZT, and 0.1 μA leakage at 14 V reverse bias. It provides precision voltage regulation in space-constrained portable power rails and ESD-sensitive signal conditioning circuits.
For engineers reviewing the SZMMBZ5248BLT1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, automotive-grade AEC-Q101 qualification status, thermal derating behavior, and real-world use context for low-power voltage reference and overvoltage clamp design.
Technical Context
This device operates as a two-terminal silicon Zener diode with sharp reverse breakdown at nominal 18 V, designed for stable voltage reference and transient suppression in low-current (<20 mA) bias conditions. Its 21 Ω Zener impedance at 7 mA ensures minimal output variation under load shifts.
The SOT-23 package supports automated placement and reflow soldering per JEDEC J-STD-020, with 260°C/10s maximum solder temperature and UL 94 V-0 flammability rating. Its cathode band polarity and NC pin (Pin 2) are fixed per Style 8 mechanical outline.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1–18.9 V at 7 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation (PD) | 225 mW on FR-5 board @ 25°C - sets maximum continuous power handling before thermal derating begins |
| Zener Impedance (ZZT) | 21 Ω @ IZT = 7 mA - determines output voltage stability against current fluctuations |
| Leakage Current (IR) | 0.1 μA @ VR = 14 V - confirms low standby power loss in high-impedance bias networks |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct integration into handheld device I/O protection without external ESD buffers |
| Junction Temp Range | −65°C to +150°C - supports operation in automotive under-hood and industrial ambient environments |
| AEC-Q101 Qualified | Yes - meets stress testing requirements for automotive electronics reliability validation |
Pinout & Package
SOT-23 (TO-236) package: 2.90 mm × 1.30 mm × 1.00 mm body, 1.90 mm lead pitch, void-free thermosetting plastic case with corrosion-resistant finish. Cathode indicated by band; Pin 2 is internally unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Forward-biased terminal; connects to lower-potential node in regulation path |
| Pin 2 | No Connection | Internally isolated; must remain floating-no PCB trace or pad required |
| Pin 3 | Cathode | Reverse-biased terminal; connects to regulated voltage rail or clamp point |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q101 qualified and PPAP capable - enables use in Tier-1 automotive subsystems without additional qualification effort |
| Pb-free / RoHS compliance | Fully compliant with EU RoHS Directive 2011/65/EU and halogen-free/BFR-free - satisfies global environmental compliance mandates |
| High-density packaging | SOT-23 footprint occupies <1.5 mm² PCB area - ideal for multi-rail voltage monitoring in compact mobile PCBs |
| Thermal robustness | 556°C/W junction-to-ambient thermal resistance on FR-5 - allows accurate thermal margin calculation for 225 mW operation |
| ESD-hardened construction | Class 3 HBM (>16 kV) rating - eliminates need for discrete ESD diodes in low-speed analog/sensor interface paths |
Applications
| Cellular Phone Power Management | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Regulating bias voltage for RF front-end LNA and sensor interface ICs in LTE/5G handsets. IC Role / Device Role / Timing Role: Zener reference diode providing stable 18 V supply rail for analog circuitry. Use Value: Maintains ±5% regulation tolerance across −40°C to +85°C ambient, enabling consistent RF gain and noise figure performance. |
Use Scenario: Clamping CAN transceiver VIO pins against load-dump transients in 12 V vehicle networks. IC Role / Device Role / Timing Role: Overvoltage protection element shunting surge energy above 18 V threshold. Use Value: Limits peak clamped voltage to ≤18.9 V with 21 Ω dynamic impedance, preventing damage to 24 V-tolerant transceivers. |
| Industrial Sensor Signal Conditioning | Medical Wearable Battery Monitoring |
Use Scenario: Providing reference voltage for 12-bit ADC input scaling in temperature/humidity sensor nodes. IC Role / Device Role / Timing Role: Precision Zener reference establishing known full-scale input range. Use Value: Delivers 18 V ±0.9 V tolerance with <0.1 μA leakage, minimizing offset error and power drain in battery-powered nodes. |
Use Scenario: Stabilizing charging voltage monitor circuit in lithium-polymer battery fuel gauges. IC Role / Device Role / Timing Role: Voltage clamp protecting microcontroller ADC input during charger insertion events. Use Value: Activates at 17.1 V with fast response, limiting transient overshoot to safe levels while consuming zero quiescent current below threshold. |
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-C18LT1G | Same 18 V nominal Zener, but 350 mW PD rating and 40 Ω ZZT @ 5 mA - higher power, lower regulation precision | Preferred where higher surge energy absorption is needed, e.g., 24 V industrial I/O protection | Select when thermal margin >225 mW is required and tighter Zener impedance is not critical |
| SZMMBZ5247BLT1G | 17 V nominal Zener (16.15–17.85 V), identical package, power rating, and AEC-Q101 qualification | Used where system tolerances require slightly lower regulation threshold, e.g., 16.5 V logic supply supervision | Choose for drop-in replacement in designs requiring 17 V instead of 18 V reference, with no layout change |
Compared with BZX84-C18LT1G, SZMMBZ5248BLT1G offers tighter voltage tolerance and lower dynamic impedance for precision references; compared with SZMMBZ5247BLT1G, it provides a 1 V higher regulation point while maintaining identical automotive qualification and thermal profile.
Availability
SZMMBZ5248BLT1G is available at Aetrix Electronics and suitable for cellular phone power management, automotive body control modules, industrial sensor signal conditioning, and medical wearable battery monitoring requiring stable component supply across extended temperature ranges and automotive-grade reliability.
Supply support for SZMMBZ5248BLT1G 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 power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
SZMMBZ5248BLT1G belongs to the SZMMBZ52xxBLT1G automotive Zener series, engineered for high-reliability voltage regulation and transient suppression in safety-critical and harsh-environment electronic systems.
FAQ
What is the nominal Zener voltage of SZMMBZ5248BLT1G and its tolerance?
The nominal Zener voltage of SZMMBZ5248BLT1G is 18 V, with a guaranteed range of 17.1 V to 18.9 V at 7 mA test current (IZT). This ±5% tolerance is specified per onsemi's MMBZ52xxBLT1G Series datasheet Rev. 16, ensuring predictable regulation behavior across production lots and temperature extremes.
Is SZMMBZ5248BLT1G qualified for automotive applications?
Yes, SZMMBZ5248BLT1G is AEC-Q101 qualified and PPAP capable. The "SZ" prefix explicitly denotes automotive-grade manufacturing controls, site-specific process validation, and extended reliability testing - making SZMMBZ5248BLT1G suitable for use in body control modules, infotainment systems, and other non-safety-critical automotive electronics.
What is the maximum power dissipation of SZMMBZ5248BLT1G on a standard FR-5 PCB?
SZMMBZ5248BLT1G has a maximum power dissipation of 225 mW on FR-5 board at 25°C ambient, derating linearly at 1.8 mW/°C above that temperature. This rating is defined in the "Maximum Ratings" table of the official onsemi datasheet and reflects thermal performance under standardized JEDEC test conditions.
Does SZMMBZ5248BLT1G have a no-connect pin, and how should it be handled on the PCB?
Yes, SZMMBZ5248BLT1G uses Style 8 pinout: Pin 1 is Anode, Pin 2 is No Connection (NC), and Pin 3 is Cathode. Pin 2 must remain unconnected on the PCB - no trace, pad, or via should be assigned to it, as it is internally isolated and serves no electrical function.
What is the Zener impedance of SZMMBZ5248BLT1G and why does it matter?
SZMMBZ5248BLT1G has a maximum Zener impedance (ZZT) of 21 Ω at IZT = 7 mA. This value quantifies how tightly the device maintains its regulated voltage under varying current loads - lower impedance means less voltage deviation, which is critical for precision reference and low-noise analog supply applications.
SZMMBZ5248BLT1G 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)
SZMMBZ5248BLT1G FAQ
1.How can I place an order for SZMMBZ5248BLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5248BLT1G 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 SZMMBZ5248BLT1G reliable?
The price and inventory of SZMMBZ5248BLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5248BLT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5248BLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5248BLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5248BLT1G?
SZMMBZ5248BLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5248BLT1G 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 SZMMBZ5248BLT1G?
For technical support, including SZMMBZ5248BLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5248BLT1G requirements.
6.How does Aetrix verify that SZMMBZ5248BLT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5248BLT1G 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 SZMMBZ5248BLT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5248BLT1G?
All SZMMBZ5248BLT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5248BLT1G, 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 SZMMBZ5248BLT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5248BLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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