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onsemi MMBZ5248BL
- Part No.:
- MMBZ5248BL
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5248BL.pdf
- Description:
- DIODE ZENER 18V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:40,000
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Product details
Overview
MMBZ5248BL from ON Semiconductor is a 18 V, 225 mW surface-mount Zener diode in SOT-23 package, designed for precision voltage regulation and transient suppression in space-constrained circuits. It delivers 7 mA test current (IZT), 21 Ω dynamic impedance (ZZT), 0.1 µA leakage at 14 V (IR), and −65 °C to +150 °C operating range - deployed in portable power rails and voltage reference stages of handheld electronics.
For engineers reviewing the MMBZ5248BL datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance (±5.5%), thermal resistance (556 °C/W on FR-5), ESD robustness (>16 kV HBM), and NC pin isolation in high-density PCB layouts.
Technical Context
This device operates as a two-terminal shunt regulator with cathode-anode polarity, where reverse-biased conduction initiates at 17.1–18.9 V (min–max VZ @ IZT = 7 mA). Its 225 mW power rating is specified on FR-5 board at 25 °C, derating linearly at 1.8 mW/°C above ambient.
The SOT-23 package features Pin 1 (Anode), Pin 2 (No Connection), and Pin 3 (Cathode), with void-free thermoset plastic case rated UL 94 V-0 and solderable corrosion-resistant finish. Junction-to-ambient thermal resistance is 556 °C/W, enabling stable regulation under moderate thermal load in compact designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1–18.9 V @ IZT = 7 mA - defines regulated output voltage window for feedback or clamp circuits |
| Power Dissipation (PD) | 225 mW on FR-5 board @ TA = 25 °C - sets maximum continuous DC power handling before thermal shutdown |
| Zener Impedance (ZZT) | 21 Ω @ IZT = 7 mA - determines regulation stiffness and AC ripple rejection capability |
| Leakage Current (IR) | 0.1 µA @ VR = 14 V - ensures minimal standby current draw in battery-powered systems |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - supports direct handling and assembly without external protection |
| Junction Temp Range | −65 °C to +150 °C - enables operation in automotive under-hood and industrial control environments |
| Forward Voltage (VF) | 0.95 V max @ IF = 10 mA - defines forward conduction threshold when used bidirectionally or as rectifier |
Pinout & Package
SOT-23 (Case 318, Style 8) surface-mount package with 1.0 mm × 1.4 mm footprint, 0.95 mm height, and Pb-free plating. Cathode identified by band; Pin 2 is internally unconnected and must remain floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias regulation; carries full Zener current during clamping |
| 2 | No Connection | Internally isolated - must not be soldered or routed; avoids unintended parasitic coupling |
| 3 | Cathode | Connected to regulated voltage rail; polarity band aligns with this terminal for visual orientation |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOT-23 packaging | Enables placement on 0.65 mm pitch PCBs and integration into ultra-thin mobile modules |
| 225 mW power rating on FR-5 | Supports sustained regulation in 3.3 V/5 V auxiliary rails without heatsinking |
| ESD hardness >16 kV HBM | Eliminates need for discrete ESD protection in USB, SIM, and button interface lines |
| Wide Zener voltage range coverage | Part of 2.4–91 V family - allows single-source procurement across multiple voltage tiers |
| Pb-free and RoHS-compliant | Meets IPC-J-STD-020 moisture sensitivity level 1 (MSL-1) for standard reflow processes |
Applications
| Battery Voltage Monitor | USB Port Overvoltage Clamp |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage in smart battery packs using resistive divider into ADC input. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 18 V reference point for ratio-metric scaling. Use Value: Tight 5.5% VZ tolerance and low 0.1 µA IR minimize measurement drift and self-discharge over shelf life. |
Use Scenario: Protecting USB 2.0 data lines and VBUS against ESD and transient surges from hot-plug events. IC Role / Device Role / Timing Role: Fast-acting shunt clamp diverting surge energy away from PHY transceivers. Use Value: 16 kV HBM rating and 21 Ω ZZT ensure sub-10 ns response and <1 V overshoot during 8 kV contact discharge. |
| Industrial Sensor Signal Conditioning | Programmable Logic Controller Input Protection |
Use Scenario: Stabilizing excitation voltage for 4–20 mA loop-powered pressure sensors in factory automation. IC Role / Device Role / Timing Role: Low-noise voltage reference establishing fixed bias for Wheatstone bridge amplifiers. Use Value: −65 °C to +150 °C TJ range and 556 °C/W RJA allow reliable operation inside sealed enclosures near motors or drives. |
Use Scenario: Safeguarding 24 V DC digital input channels against field-wiring faults and inductive kickback. IC Role / Device Role / Timing Role: Primary overvoltage suppressor placed before optocoupler input stage. Use Value: 225 mW PD rating and 17.1–18.9 V VZ window clamp transients to safe levels while preserving signal integrity. |
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 VZ, but 300 mW PD rating and 35 Ω ZZT @ 5 mA | Higher power handling suits 24 V industrial inputs; higher impedance reduces regulation accuracy | Select when higher surge energy absorption is required and tighter voltage stability is secondary |
| MMBZ5248BS | Identical electrical specs but in SOD-323 package (smaller footprint, 2-pin, no NC) | Lacks NC pin - simplifies layout but removes isolation option for noise-sensitive analog sections | Select when board area is critical and unused pin isolation is unnecessary |
Compared with MMBZ5248BL, BZX84-C18LT1G offers greater power margin at the cost of regulation precision, while MMBZ5248BS trades pin isolation for footprint reduction - both require review of thermal layout and PCB routing constraints.
Availability
MMBZ5248BL is available at Aetrix Electronics and suitable for battery management systems, USB interface protection, industrial sensor signal conditioning, and PLC input stage regulation requiring stable component supply across extended temperature ranges and high-volume production.
Supply support for MMBZ5248BL 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 is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MMBZ52xxBL series targets space-constrained, high-reliability voltage regulation in portable and embedded systems - engineered for low-profile mounting, high ESD immunity, and consistent Zener performance across temperature extremes.
FAQ
What is the exact Zener voltage range for MMBZ5248BL at 7 mA test current?
The MMBZ5248BL has a guaranteed Zener voltage range of 17.1 V (minimum) to 18.9 V (maximum) when tested at IZT = 7 mA and TA = 25 °C. This ±5.5% tolerance reflects the device's specification across manufacturing lot variation and is confirmed in the Electrical Characteristics table on page 3 of the ON Semiconductor datasheet. The nominal value is 18 V.
Does MMBZ5248BL have a functional connection on Pin 2?
No, Pin 2 of the MMBZ5248BL is explicitly designated as "No Connection" in the datasheet pinout and internal construction. It is electrically isolated and must remain unconnected in PCB layout - routing or soldering to Pin 2 may introduce parasitic coupling or mechanical stress. The device functions correctly using only Pins 1 (Anode) and 3 (Cathode).
What is the maximum allowable junction temperature for continuous operation of MMBZ5248BL?
The MMBZ5248BL supports continuous operation from −65 °C to +150 °C junction temperature (TJ). This range is validated per JEDEC standards and enables use in under-hood automotive, industrial motor controls, and outdoor IoT nodes. Derating begins above 25 °C ambient, reducing power dissipation by 1.8 mW/°C on FR-5 board.
How does the ESD rating of MMBZ5248BL impact system-level protection design?
The MMBZ5248BL is rated Class 3 (>16 kV) per Human Body Model, meaning it withstands direct ESD strikes up to 16 kV without degradation. This eliminates the need for additional TVS diodes in many low-energy interfaces (e.g., buttons, status LEDs, sensor bias lines), simplifying BOM and layout - though system-level IEC 61000-4-2 compliance still requires full path analysis.
Is MMBZ5248BL compatible with lead-free reflow processes?
Yes, MMBZ5248BL is offered in Pb-free variants (e.g., MMBZ5248BLT1G) and qualified for standard lead-free reflow profiles, including peak temperatures up to 260 °C for 10 seconds. Its thermoset plastic package meets IPC-J-STD-020 MSL-1 classification, allowing unlimited floor life and compatibility with automated SMT assembly without pre-baking.
MMBZ5248BL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- 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:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
MMBZ5248BL FAQ
1.How can I place an order for MMBZ5248BL through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5248BL 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 MMBZ5248BL reliable?
The price and inventory of MMBZ5248BL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5248BL is usually 5 days.
3.What payment methods are accepted for MMBZ5248BL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5248BL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5248BL?
MMBZ5248BL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5248BL 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 MMBZ5248BL?
For technical support, including MMBZ5248BL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5248BL requirements.
6.How does Aetrix verify that MMBZ5248BL is sourced from the original manufacturer or authorized distributors?
All MMBZ5248BL 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 MMBZ5248BL meets industry standards.
7.What is the process for return or replacement of MMBZ5248BL?
All MMBZ5248BL units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5248BL, 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 MMBZ5248BL part is unused and in its original packaging.
Return procedure for MMBZ5248BL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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