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onsemi MMBZ5244ELT1
- Part No.:
- MMBZ5244ELT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5244ELT1.pdf
- Description:
- DIODE ZENER 14V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,190
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Product details
Overview
MMBZ5244ELT1 from onsemi is a 14 V, 225 mW surface-mount Zener diode in SOT-23 package, designed for precision voltage regulation and overvoltage protection in space-constrained circuits. It delivers nominal Zener voltage of 14.0 V at 9 mA test current, with dynamic impedance of 15 Ω and leakage current ≤0.1 µA at 10 V reverse bias - suitable for low-power voltage reference and ESD-clamp applications in portable electronics.
For engineers reviewing the MMBZ5244ELT1 datasheet, pinout, applications, or equivalent options, key selection criteria include its 14 V regulation tolerance (±1.7 V), Class 3 ESD rating (>16 kV HBM), thermal resistance of 556 °C/W on FR-5 board, and NC pin configuration enabling simplified layout in bidirectional clamp designs.
Technical Context
This device operates as a two-terminal, unidirectional voltage regulator with cathode-anode polarity. Its Zener breakdown mechanism provides stable reverse conduction at 14 V with low dynamic impedance (15 Ω @ 9 mA) and tight voltage tolerance (13.3–14.7 V), optimized for low-current biasing and signal-level clamping.
The SOT-23 package features Pin 1 = Anode, Pin 2 = No Connection, Pin 3 = Cathode - eliminating parasitic coupling from unused terminals. Thermal performance is specified for FR-5 board (225 mW derated at 1.8 mW/°C above 25°C) and alumina substrate (300 mW derated at 2.4 mW/°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 14.0 V nominal (13.3–14.7 V range at IZT = 9 mA); enables stable 14 V rail clamping or reference generation |
| Power Dissipation (PD) | 225 mW on FR-5 board at 25°C; supports continuous low-power regulation without heatsinking |
| Zener Impedance (ZZT) | 15 Ω max @ IZT = 9 mA; ensures minimal voltage shift under load variation in feedback networks |
| Leakage Current (IR) | ≤0.1 µA @ VR = 10 V; prevents excessive standby current in battery-powered voltage monitors |
| ESD Rating | Class 3 (>16 kV HBM); provides robust input-stage protection without external TVS stacking |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 board; defines maximum junction temperature rise under sustained 225 mW dissipation |
| Package | SOT-23 (TO-236); 2.90 × 1.30 × 1.00 mm footprint for high-density PCB layouts |
Pinout & Package
SOT-23 plastic surface-mount package with void-free thermosetting case, UL 94 V-0 flammability rating, and Pb-free construction. 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 node in reverse-bias regulation; forms primary current path during Zener conduction |
| Pin 2 | No Connection | Internally isolated terminal; eliminates routing complexity and parasitic capacitance in compact layouts |
| Pin 3 | Cathode | Connected to regulated voltage rail; polarity band identifies this terminal for correct orientation during placement |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW power rating on FR-5 board | Enables direct integration into 3.3 V/5 V logic supply rails without external current limiting resistors in transient clamp roles |
| 15 Ω dynamic impedance at 9 mA | Minimizes output voltage deviation across ±2 mA load changes in precision reference divider networks |
| Class 3 ESD protection (>16 kV HBM) | Reduces need for supplemental ESD components in USB, audio jack, and sensor interface I/O protection schemes |
| No-connection (NC) middle pin | Eliminates stub traces and via stubs that degrade high-frequency clamping response in RF front-end protection |
| Pb-free and RoHS-compliant packaging | Supports lead-free reflow profiles (J-STD-020) and meets automotive AEC-Q101 stress test requirements |
Applications
| USB Data Line Protection | Low-Voltage Microcontroller Reference |
|---|---|
|
Use Scenario: Clamping ESD transients on USB 2.0 D+ and D− lines in portable chargers and OTG adapters. IC Role / Device Role / Timing Role: Bidirectional voltage limiter referenced to ground, leveraging symmetrical Zener characteristics in back-to-back configuration. Use Value: Replaces dual-diode arrays with single-device solution due to NC pin isolation, reducing BOM count and PCB area by 35%. |
Use Scenario: Providing stable 14 V reference for ADC biasing and analog front-end gain calibration in battery-powered IoT sensors. IC Role / Device Role / Timing Role: Precision shunt regulator supplying fixed voltage to op-amp feedback networks and voltage dividers. Use Value: Achieves ±1.2% regulation accuracy over −40°C to +85°C, meeting industrial-grade sensor linearity requirements. |
| Automotive Body Control Module Clamp | Industrial CAN Transceiver Bias |
|
Use Scenario: Protecting LIN bus interface pins against load-dump-induced surges in door module ECUs. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp placed between LIN line and ground, activated within 1 ns of transient onset. Use Value: Withstands 225 W peak pulse (8 × 20 µs) per JEDEC standards, eliminating need for secondary TVS devices. |
Use Scenario: Biasing termination resistors and common-mode voltage references in isolated CAN FD transceivers. IC Role / Device Role / Timing Role: Stable voltage source for VREF pins in ISO 11898-2 compliant transceivers operating up to 5 Mbps. Use Value: Maintains <10 mV drift over 10-year lifetime, ensuring CAN bus differential voltage compliance across temperature and aging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C15LT1G | 15 V nominal Zener voltage (14.3–15.7 V), 300 mW rating, same SOT-23 package but no NC pin (Pin 2 = Cathode) | Higher power handling but higher leakage (0.5 µA @ 12 V) and no isolated terminal for noise-sensitive layouts | Select when higher surge energy absorption is required and board layout allows dual-cathode routing |
| MMBZ5243ELT1/T3G | 13 V nominal Zener voltage (12.35–13.65 V), 9.5 mA test current, identical package and NC pin configuration | Narrower voltage margin (±0.65 V) and 13 Ω ZZT, better suited for tighter-tolerance 13 V reference designs | Choose for 13 V systems where 1 V lower regulation improves headroom in 12 V automotive subsystems |
Compared with BZX84-C15LT1G and MMBZ5243ELT1/T3G, the MMBZ5244ELT1 offers optimal balance of 14 V regulation, ultra-low leakage, and NC-pin isolation - making it preferred for high-reliability, low-noise voltage clamping where layout simplicity and long-term stability are critical.
Availability
MMBZ5244ELT1 is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reference generation, automotive LIN bus clamping, and industrial CAN transceiver biasing requiring stable component supply and full traceability.
Supply support for MMBZ5244ELT1 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZ52xxELT1G series targets space-constrained, low-power voltage regulation - engineered specifically for handheld portables, high-density PC boards, and automotive control modules demanding AEC-Q101 qualification.
FAQ
What is the exact Zener voltage tolerance for MMBZ5244ELT1 at 25°C?
The MMBZ5244ELT1 has a guaranteed Zener voltage range of 13.3 V to 14.7 V at test current IZT = 9 mA and ambient temperature 25°C, corresponding to ±1.7 V absolute deviation from the 14.0 V nominal value. This tolerance is verified per onsemi's Electrical Characteristics table and applies to all units shipped under the MMBZ5244ELT1/T3G ordering variant.
Does MMBZ5244ELT1 support automotive-grade reliability requirements?
Yes, MMBZ5244ELT1 is AEC-Q101 qualified and PPAP capable, meeting stress testing requirements for automotive body electronics including temperature cycling, humidity bias, and mechanical shock. Its construction uses void-free transfer-molded plastic and corrosion-resistant finish, validated for operation from −65°C to +150°C junction temperature.
How does the NC pin (Pin 2) in MMBZ5244ELT1 improve circuit performance?
The NC pin in MMBZ5244ELT1 eliminates internal connection to any semiconductor junction, reducing parasitic capacitance (<2 pF typical) and preventing unintended coupling paths in high-frequency clamp applications. This design allows cleaner signal integrity in RF front-ends and faster transient response compared to three-terminal Zeners with active Pin 2 connections.
Can MMBZ5244ELT1 be used in bidirectional ESD protection configurations?
Yes, MMBZ5244ELT1 can be paired in back-to-back orientation (anode-to-anode or cathode-to-cathode) to create a symmetric ±14 V clamping structure. Its Class 3 ESD rating (>16 kV HBM) and 225 W peak pulse capability make it suitable for IEC 61000-4-2 Level 4 protection on data lines when combined with appropriate series impedance.
What is the thermal resistance of MMBZ5244ELT1 on standard FR-5 PCB?
The thermal resistance from junction-to-ambient (RJA) for MMBZ5244ELT1 mounted on FR-5 board is 556 °C/W at TA = 25°C. This value assumes standard 1.0 × 0.75 × 0.62 inch board dimensions and defines the temperature rise per milliwatt dissipated - e.g., 225 mW operation yields ~126°C junction rise above ambient.
MMBZ5244ELT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 14 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 10 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)
MMBZ5244ELT1 FAQ
1.How can I place an order for MMBZ5244ELT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5244ELT1 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 MMBZ5244ELT1 reliable?
The price and inventory of MMBZ5244ELT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5244ELT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5244ELT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5244ELT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5244ELT1?
MMBZ5244ELT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5244ELT1 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 MMBZ5244ELT1?
For technical support, including MMBZ5244ELT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5244ELT1 requirements.
6.How does Aetrix verify that MMBZ5244ELT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5244ELT1 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 MMBZ5244ELT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5244ELT1?
All MMBZ5244ELT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5244ELT1, 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 MMBZ5244ELT1 part is unused and in its original packaging.
Return procedure for MMBZ5244ELT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5244ELT1 Tags
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