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onsemi MMBZ5245ELT1
- Part No.:
- MMBZ5245ELT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5245ELT1.pdf
- Description:
- DIODE ZENER 15V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,288
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Product details
Overview
MMBZ5245ELT1 from onsemi is a 15 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 15.0 V at 8.5 mA test current, with dynamic impedance of 16 Ω at IZT, leakage current ≤0.1 µA at 11 V reverse bias, and ESD rating >16 kV (HBM). It is used in power rail clamping for portable electronics and reference voltage generation in low-power sensor interfaces.
For engineers reviewing the MMBZ5245ELT1 datasheet, pinout, applications, or equivalent options, key selection criteria include its 15 V Zener tolerance (±5%), thermal resistance of 556 °C/W on FR-5 board, NC terminal isolation, and Pb-free SOT-23 footprint compatibility with automated assembly.
Technical Context
This device operates as a two-terminal voltage reference with cathode-anode polarity and a non-connected (NC) terminal-pin 2 is internally unconnected and must remain floating. Its Zener breakdown is optimized for stable regulation under DC and low-frequency transient conditions, with temperature coefficient near zero at ~15 V (per Figure 1).
The MMBZ5245ELT1 exhibits 0.1 µA max reverse leakage at VR = 11 V, 16 Ω dynamic impedance at 8.5 mA, and maintains regulation across −65°C to +150°C junction temperature range. Its 225 W peak pulse power rating (8 × 20 µs) supports transient suppression without derating in short-duration surge events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 14.25–15.75 V @ IZT = 8.5 mA - ensures ±5% regulation accuracy for 15 V rail stabilization |
| Power Dissipation | 225 mW on FR-5 board - defines continuous thermal limit for PCB layout and copper area requirements |
| Zener Impedance (ZZT) | 16 Ω @ IZT - determines output voltage variation under load current changes |
| Reverse Leakage (IR) | ≤0.1 µA @ VR = 11 V - guarantees minimal standby current draw in battery-powered systems |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct integration into handheld device front-end without external ESD protection |
| Package | SOT-23 (Case 318) - provides 2.90 × 1.30 × 1.00 mm footprint for high-density routing and reflow compatibility |
| Junction Temp Range | −65°C to +150°C - supports operation in automotive under-hood and industrial control environments |
Pinout & Package
SOT-23 plastic surface-mount package (Case 318, Style 8), void-free thermosetting body, Pb-free, UL 94 V-0 rated. Cathode indicated by band; pin 2 is internally not connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | DC current entry point during forward bias; tied to lower-potential node in Zener clamp configuration |
| 2 | No Connection (NC) | Internally unconnected - must be left floating; no trace or pad required beyond mechanical support |
| 3 | Cathode | Regulated output node; connected to protected rail or reference point; polarity band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating | Enables stable voltage clamping in compact 3.0 mm² footprint without heatsinking on standard FR-5 PCB |
| 16 kV HBM ESD Robustness | Eliminates need for discrete TVS in consumer portables where human-contact ESD is primary threat |
| Zero-Temp-Coefficient Zone | Optimized 15 V nominal point aligns with minimal TC (~0 mV/°C), reducing drift in temperature-varying environments |
| Pb-Free & RoHS Compliant | Meets global environmental compliance mandates without performance trade-offs or solderability impact |
| Peak Pulse Power: 225 W | Withstands IEC 61000-4-5 Level 3 surges (1 A, 8/20 µs) when used with series current-limiting resistor |
Applications
| USB Port Overvoltage Protection | Low-Power Sensor Reference |
|---|---|
Use Scenario: Clamping 5 V USB data/power lines against ESD and hot-swap transients in smartphones and accessories. IC Role / Device Role / Timing Role: Two-terminal shunt regulator placed between VBUS and GND, conducting only during overvoltage events. Use Value: Leverages 16 kV HBM rating and 15 V Zener to absorb fast transients while drawing <0.1 µA in normal operation - preserving battery life. |
Use Scenario: Providing stable 15 V reference for analog front-ends in IoT temperature/humidity sensors. IC Role / Device Role / Timing Role: Passive voltage reference source for ADC biasing and op-amp feedback networks. Use Value: 16 Ω ZZT and ±5% VZ tolerance ensure <10 mV output variation across 1–20 mA load range - sufficient for 12-bit measurement accuracy. |
| Automotive Body Control Module Clamp | Industrial PLC Input Protection |
Use Scenario: Protecting LIN bus interface ICs from load-dump-induced spikes in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Shunt limiter on LIN transceiver VCC rail, activated above 15 V to divert surge energy. Use Value: −65°C to +150°C operating range and AEC-Q101 qualification (via SZ-prefix variants) confirm suitability for under-dash deployment. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers against field-wiring faults. IC Role / Device Role / Timing Role: Primary overvoltage clamp before optocoupler or Schmitt-trigger input stage. Use Value: 225 W peak pulse rating allows coordination with upstream fuses to clear 100 ms overvoltages up to 30 V without failure. |
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 | Same 15 V nominal, but 300 mW rating and 30 Ω ZZT; SOT-23 package with pin 2 connected to cathode (not NC) | Higher power handling suits higher-current clamping; cathode-connected pin 2 requires PCB redesign | Select when >225 mW continuous dissipation is needed and pinout change is acceptable |
| MMBZ5245BS | Same electrical specs but in SOD-123 package (larger, 2-pin, no NC terminal); 350 mW rating | Greater thermal mass improves reliability in sustained overvoltage; incompatible with SOT-23 pick-and-place | Choose for improved thermal margin in industrial power supplies where board space permits larger footprint |
Compared with BZX84-C15LT1G and MMBZ5245BS, the MMBZ5245ELT1 uniquely combines NC pin isolation, ultra-low leakage, and SOT-23 automation compatibility - making it optimal for high-volume portable designs requiring minimal parasitic capacitance and zero-layout revision.
Availability
MMBZ5245ELT1 is available at Aetrix Electronics and suitable for USB protection, sensor reference, automotive body control, and industrial PLC input conditioning requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for MMBZ5245ELT1 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 MMBZ52xxELT1G series was engineered for miniaturized, high-reliability voltage regulation in portable and automotive electronics - emphasizing low leakage, high ESD immunity, and automated assembly readiness.
FAQ
What is the exact Zener voltage tolerance of MMBZ5245ELT1 at 25°C?
The MMBZ5245ELT1 has a guaranteed Zener voltage range of 14.25 V to 15.75 V at IZT = 8.5 mA and TA = 25°C, corresponding to ±5% tolerance around the nominal 15.0 V rating. This tolerance is specified in the Electrical Characteristics table on page 2 of the official onsemi datasheet (Rev. 9, August 2024), and applies strictly under the defined test conditions.
Is pin 2 of MMBZ5245ELT1 electrically connected or should it be left floating?
Pin 2 of the MMBZ5245ELT1 is explicitly designated as "No Connection" (NC) per the datasheet's Pinout section (Style 8, page 6) and Electrical Characteristics footnote. It is internally unconnected and must remain floating - no PCB trace, via, or component connection should be made to this terminal to avoid unintended circuit interaction or reliability risk.
Does MMBZ5245ELT1 meet AEC-Q101 for automotive use?
The MMBZ5245ELT1 itself is not AEC-Q101 qualified; however, the functionally identical SZMMBZ5245ELT1G variant - bearing the "SZ" prefix - is fully AEC-Q101 qualified and PPAP capable per the datasheet's Features section. For automotive applications requiring qualification, engineers must specify the SZ-prefix part, not MMBZ5245ELT1.
What is the maximum reverse leakage current for MMBZ5245ELT1 and at what voltage is it measured?
The MMBZ5245ELT1 has a maximum reverse leakage current (IR) of 0.1 µA, measured at VR = 11 V and TA = 25°C. This value is confirmed in the Electrical Characteristics table (page 2) and reflects worst-case leakage under sub-Zener bias - critical for battery-operated systems where standby current must be minimized.
Can MMBZ5245ELT1 be used for transient voltage suppression in addition to DC regulation?
Yes, the MMBZ5245ELT1 supports transient suppression via its 225 W peak pulse power rating (8 × 20 µs waveform, per Maximum Ratings table), provided an appropriate series current-limiting resistor is used. Its 16 kV HBM ESD rating further validates suitability for fast transients, though it is not rated for repetitive surge standards like IEC 61000-4-5 without system-level design validation.
MMBZ5245ELT1 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):
- 15 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 16 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 11 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)
MMBZ5245ELT1 FAQ
1.How can I place an order for MMBZ5245ELT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5245ELT1 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 MMBZ5245ELT1 reliable?
The price and inventory of MMBZ5245ELT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5245ELT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5245ELT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5245ELT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5245ELT1?
MMBZ5245ELT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5245ELT1 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 MMBZ5245ELT1?
For technical support, including MMBZ5245ELT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5245ELT1 requirements.
6.How does Aetrix verify that MMBZ5245ELT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5245ELT1 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 MMBZ5245ELT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5245ELT1?
All MMBZ5245ELT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5245ELT1, 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 MMBZ5245ELT1 part is unused and in its original packaging.
Return procedure for MMBZ5245ELT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5245ELT1 Tags
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