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onsemi MMBZ5248BLT3G
- Part No.:
- MMBZ5248BLT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5248BLT3G.pdf
- Description:
- DIODE ZENER 18V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:16,069
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Product details
Overview
MMBZ5248BLT3G from onsemi is a 18 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board at 25°C, with 7 mA test current, 21 Ω dynamic impedance at IZT, and 0.1 μA reverse leakage at 14 V. It provides precision voltage regulation in space-constrained portable electronics.
For engineers reviewing the MMBZ5248BLT3G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal resistance (556 °C/W), ESD rating (>16 kV HBM), cathode-anode polarity marking, and compatibility with automated SMT assembly on high-density PCBs.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp voltage at its nominal Zener voltage of 18 V when biased above VZ. Its 21 Ω Zener impedance at 7 mA ensures stable regulation under moderate load transients.
The SOT-23 package features a defined pinout (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode) and supports reflow soldering up to 260°C for 10 seconds. Thermal resistance of 556 °C/W (Junction-to-Ambient, FR-5 board) defines its derating behavior above 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1 V min / 18.9 V max at IZT = 7 mA - defines regulated output range under standard test conditions |
| Power Dissipation (PD) | 225 mW on FR-5 board at 25°C - sets maximum continuous power handling before thermal derating applies |
| Zener Impedance (ZZT) | 21 Ω at IZT = 7 mA - determines AC voltage variation under changing load current |
| Reverse Leakage (IR) | 0.1 μA at VR = 14 V - indicates low standby current in pre-breakdown region |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - enables robust handling in manual and automated assembly |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 board - defines temperature rise per watt, critical for thermal design margin |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - specifies conduction loss when used in forward-biased protection paths |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 mm × 1.30 mm × 1.00 mm body size, void-free thermosetting plastic case with corrosion-resistant finish. Cathode indicated by polarity band; maximum soldering temperature 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential side of regulated node; reverse-biased during Zener operation |
| Pin 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| Pin 3 | Cathode | Connected to higher-potential side (e.g., supply rail); polarity band aligns with this terminal |
Key Features
| Feature | Design Value |
|---|---|
| Pb-Free, Halogen-Free/BFR-Free | RoHS-compliant construction enabling environmentally regulated production without material substitution risk |
| Small SOT-23 footprint | Enables placement on high-density PCBs where board area is constrained, such as smartphone PMIC rails |
| 225 mW power rating | Supports low-power voltage clamping and reference functions without heatsinking in ambient-temperature environments |
| Class 3 ESD robustness | Eliminates need for external ESD protection in handheld device I/O and bias networks |
| Automated assembly optimized | Transfer-molded case geometry and lead finish ensure reliable pick-and-place and reflow yield |
Applications
| Portable Power Rail Protection | Low-Power Reference Generation |
|---|---|
Use Scenario: Clamping transient overvoltage on 18 V bias rail in Bluetooth headset power management IC. IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing surge energy to protect downstream LDO input. Use Value: 18 V nominal Zener voltage matches rail tolerance; 21 Ω impedance limits voltage excursion to <±0.15 V under 7 mA surge. |
Use Scenario: Providing stable 18 V reference for ADC biasing in battery-powered environmental sensor node. IC Role / Device Role / Timing Role: Passive voltage reference source for analog front-end calibration circuitry. Use Value: 0.1 μA leakage at 14 V minimizes quiescent current draw; ±5% VZ tolerance meets 12-bit ADC offset accuracy requirements. |
| ESD-Sensitive Interface Protection | High-Density Board Voltage Clamp |
Use Scenario: Protecting USB data line ESD diode array input from 15 kV contact discharge in medical wearable. IC Role / Device Role / Timing Role: Secondary clamping element absorbing residual energy after primary TVS conduction. Use Value: >16 kV HBM rating ensures survival through full IEC 61000-4-2 testing; SOT-23 footprint fits adjacent to connector pads. |
Use Scenario: Regulating auxiliary 18 V supply in multi-rail FPGA carrier board with <1.5 mm pitch routing. IC Role / Device Role / Timing Role: Compact shunt regulator maintaining stable voltage across varying load conditions. Use Value: 2.90 mm × 1.30 mm SOT-23 size allows placement between BGA escape traces; NC pin simplifies layout routing. |
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 rating on FR-4 and 15 Ω ZZT at 5 mA - higher power and lower impedance. | Preferred for higher-current regulation (up to 15 mA) or tighter voltage stability needs; requires same SOT-23 footprint. | Select when system load demands >7 mA Zener current or lower dynamic impedance is required for noise-sensitive references. |
| MMBZ5248BS | Identical electrical specs but in SOD-123 package - larger footprint (3.7 mm × 1.6 mm), higher PD (410 mW on FR-4). | Better thermal performance in high-ambient or high-reliability industrial settings; incompatible with ultra-dense layouts. | Choose when thermal margin is critical and board space permits larger package; not suitable for mobile PCBs with strict area constraints. |
Compared with BZX84-C18LT1G and MMBZ5248BS, the MMBZ5248BLT3G offers optimal balance of compact SOT-23 size, 225 mW rating, and 7 mA test current - making it ideal for space-limited consumer portables where moderate power and proven manufacturability are prioritized.
Availability
MMBZ5248BLT3G is available at Aetrix Electronics and suitable for cellular phones, handheld portables, and high-density PC boards requiring stable component supply and RoHS-compliant sourcing.
Supply support for MMBZ5248BLT3G 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.
The MMBZ52xxBLT3G series belongs to onsemi's Zener voltage regulator product line, engineered specifically for compact, high-reliability voltage clamping and reference functions in portable and space-constrained electronic systems.
FAQ
What is the exact Zener voltage tolerance of MMBZ5248BLT3G?
The MMBZ5248BLT3G has a Zener voltage range of 17.1 V (minimum) to 18.9 V (maximum) at IZT = 7 mA and TA = 25°C, corresponding to a ±5% tolerance around the nominal 18 V rating. This tolerance is verified per onsemi's Electrical Characteristics table and applies under standard test conditions - actual voltage may vary slightly with temperature and current.
Does MMBZ5248BLT3G have a functional third pin?
No, MMBZ5248BLT3G uses a three-terminal SOT-23 package but only two terminals are electrically active: Pin 1 is the anode and Pin 3 is the cathode. Pin 2 is internally not connected (NC) and must remain unconnected on the PCB - it serves only mechanical support and does not participate in circuit operation.
What is the maximum allowable junction temperature for MMBZ5248BLT3G?
The MMBZ5248BLT3G has a specified junction and storage temperature range of −65°C to +150°C. Operation beyond this range risks permanent damage or parametric shift. At 225 mW dissipation on FR-5 board, junction temperature rise is calculated as ΔT = PD × RJA = 225 mW × 556 °C/W ≈ 125°C - so ambient must stay below +25°C to avoid exceeding +150°C junction limit.
Is MMBZ5248BLT3G suitable for automotive applications?
The standard MMBZ5248BLT3G is not AEC-Q101 qualified. For automotive use, onsemi offers the SZMMBZ5248BLT3G variant (with "SZ" prefix), which is AEC-Q101 qualified and PPAP capable. Engineers must specify SZMMBZ5248BLT3G explicitly when automotive-grade reliability and qualification documentation are required.
How does the ESD rating of MMBZ5248BLT3G impact system-level protection design?
The MMBZ5248BLT3G carries a Class 3 Human Body Model ESD rating (>16 kV), meaning it can withstand direct electrostatic discharge events up to that level without failure. This allows it to serve as a secondary or co-primary clamping device in I/O protection networks - reducing or eliminating the need for additional discrete ESD suppressors in cost- and space-sensitive designs like wearables and handhelds.
MMBZ5248BLT3G 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
MMBZ5248BLT3G FAQ
1.How can I place an order for MMBZ5248BLT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5248BLT3G 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 MMBZ5248BLT3G reliable?
The price and inventory of MMBZ5248BLT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5248BLT3G is usually 5 days.
3.What payment methods are accepted for MMBZ5248BLT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5248BLT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5248BLT3G?
MMBZ5248BLT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5248BLT3G 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 MMBZ5248BLT3G?
For technical support, including MMBZ5248BLT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5248BLT3G requirements.
6.How does Aetrix verify that MMBZ5248BLT3G is sourced from the original manufacturer or authorized distributors?
All MMBZ5248BLT3G 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 MMBZ5248BLT3G meets industry standards.
7.What is the process for return or replacement of MMBZ5248BLT3G?
All MMBZ5248BLT3G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5248BLT3G, 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 MMBZ5248BLT3G part is unused and in its original packaging.
Return procedure for MMBZ5248BLT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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