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onsemi MMBZ5245ELT3G
- Part No.:
- MMBZ5245ELT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5245ELT3G.pdf
- Description:
- DIODE ZENER 15V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,912
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Product details
Overview
MMBZ5245ELT3G from onsemi is a 15 V, 225 mW surface-mount Zener diode in SOT-23 package, with nominal Zener voltage 15.0 V (min 14.25 V, max 15.75 V), dynamic impedance 16 Ω at 8.5 mA test current, and reverse leakage ≤0.1 μA at 11 V, used for precision voltage regulation in space-constrained power rails of portable electronics.
For engineers reviewing the MMBZ5245ELT3G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), low leakage at rated VR, thermal resistance (556 °C/W on FR-5), ESD robustness (>16 kV HBM), and compatibility with automated SMT assembly.
Technical Context
This device operates as a two-terminal voltage reference, conducting in reverse breakdown to clamp voltage across load circuits. Its Zener mechanism provides stable regulation under varying load currents from IZK = 0.25 mA up to IZT = 8.5 mA, with temperature coefficient near zero at ~15 V (per Figure 1).
The SOT-23 package features pin 1 (anode), pin 2 (no connection), and pin 3 (cathode), enabling unidirectional clamping with polarity band marking. It supports pulse power up to 225 W (8 × 20 μs) while maintaining 225 mW steady-state dissipation on standard FR-5 PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 14.25–15.75 V @ 8.5 mA - defines regulated output range for 3.3 V/5 V rail protection and feedback sensing |
| Zener Impedance (ZZT) | 16 Ω @ 8.5 mA - ensures minimal voltage deviation under load transients in LDO bypass or ADC reference circuits |
| Reverse Leakage (IR) | ≤0.1 μA @ 11 V - enables low-power standby operation without significant quiescent current drain |
| Power Dissipation (PD) | 225 mW on FR-5 board - sets maximum continuous current limit (~15 mA at 15 V) for compact PCB designs |
| ESD Rating | Class 3 (>16 kV HBM) - allows direct integration into handheld device front-end interfaces without external protection |
| Thermal Resistance (RJA) | 556 °C/W - determines junction temperature rise (~125°C above ambient at full PD) for reliability margining |
| Package | SOT-23 (TO-236) - 2.90 × 1.30 × 1.00 mm footprint ideal for high-density mobile and IoT PCB layouts |
Pinout & Package
SOT-23 plastic surface-mount package with void-free thermosetting case, corrosion-resistant finish, UL 94 V-0 flammability rating, and cathode polarity indicated by band. Maximum soldering temperature: 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; reverse-biased during regulation; must be routed with adequate copper for thermal relief |
| 2 | No Connection | Floating terminal; no internal bond wire; must remain unconnected on PCB to avoid parasitic coupling or shorting |
| 3 | Cathode | Connected to higher-potential node; carries full Zener current; polarity band aligns with this pin for visual orientation |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating on FR-5 | Enables use in battery-powered systems without heatsinking while maintaining regulation accuracy over temperature |
| ESD Robustness >16 kV (HBM) | Eliminates need for discrete ESD protection in consumer interface circuits like USB VBUS monitoring or button debouncing |
| Pb-Free & RoHS Compliant | Meets global environmental compliance requirements for automotive, medical, and industrial end-equipment without requalification |
| Optimized for Automated Assembly | Standard SOT-23 footprint and marking support high-yield pick-and-place and AOI inspection in volume manufacturing |
| Low-Leakage Performance | 0.1 μA max IR at 11 V allows integration into ultra-low-power sensor nodes where standby current budget is <1 μA |
Applications
| USB Power Rail Clamping | LDO Feedback Voltage Reference |
|---|---|
|
Use Scenario: Protecting 5 V USB VBUS line from transient overvoltage events in portable chargers and OTG accessories. IC Role / Device Role / Timing Role: Two-terminal shunt regulator clamping peak excursions to ≤15.75 V before downstream USB controller ICs. Use Value: Prevents latch-up or damage to USB PHYs without adding series impedance or affecting data signal integrity. |
Use Scenario: Providing stable 15 V reference for adjustable LDO feedback divider in industrial sensor signal chains. IC Role / Device Role / Timing Role: Precision Zener element setting output voltage via resistor ratio; replaces bulkier 3-terminal references. Use Value: Achieves ±1% output regulation over temperature with <10 ppm/°C TC and no external bias current source required. |
| Microcontroller Reset Circuit | ADC Reference Stabilization |
|
Use Scenario: Generating clean reset threshold for 3.3 V microcontrollers in automotive body control modules. IC Role / Device Role / Timing Role: Reverse-biased Zener holding reset line high until supply reaches 14.25 V, then sinking current to trigger POR. Use Value: Eliminates timing uncertainty from RC-based resets and improves immunity to supply ripple during cold-crank conditions. |
Use Scenario: Stabilizing reference input of 12-bit SAR ADC in battery-operated environmental monitors. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage clamp reducing reference drift contribution to total INL error. Use Value: Limits reference voltage variation to <0.5% over −40°C to +85°C, preserving effective resolution below 1 LSB. |
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-C15LT1G | Same 15 V nominal Zener, but 300 mW rating and higher ZZT (30 Ω @ 5 mA); slightly larger SOT-23 variant | Higher power handling suits higher-current clamp applications; less suitable for ultra-low-leakage designs | Select when >225 mW continuous dissipation or tighter VZ tolerance (±5% vs ±5%) is needed |
| MMBZ5245BS | Same electrical specs but in SOD-123 package (larger footprint, higher thermal mass); not Pb-free | Preferred for manual repair or high-reliability aerospace use where SOT-23 mechanical robustness is insufficient | Select when board-level rework frequency is high or JEDEC J-STD-020 moisture sensitivity level is critical |
Compared with BZX84-C15LT1G and MMBZ5245BS, the MMBZ5245ELT3G offers optimal balance of miniaturization, ESD hardness, and low-leakage performance for high-volume portable electronics - making it preferred for space- and power-constrained designs where SOT-23 placement density and Pb-free compliance are mandatory.
Availability
MMBZ5245ELT3G is available at Aetrix Electronics and suitable for USB power management, LDO feedback networks, microcontroller reset generation, and ADC reference stabilization requiring stable component supply and full traceability.
Supply support for MMBZ5245ELT3G 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 MMBZ52xxELT3G series targets compact, high-reliability voltage regulation in portable and space-constrained electronics, emphasizing low-profile packaging, high ESD immunity, and consistent Zener performance across temperature.
FAQ
What is the Zener voltage tolerance of MMBZ5245ELT3G?
The MMBZ5245ELT3G has a Zener voltage range of 14.25 V to 15.75 V at 8.5 mA test current, corresponding to a ±5% tolerance around the nominal 15.0 V rating. This tolerance is guaranteed over the full operating temperature range (−65°C to +150°C) and is verified per onsemi's production test flow. The MMBZ5245ELT3G maintains this specification without derating in standard FR-5 board conditions.
Does MMBZ5245ELT3G have a built-in capacitor or ESD protection diode?
No, the MMBZ5245ELT3G is a discrete Zener diode with no integrated capacitor or additional ESD structure beyond its inherent junction characteristics. Its >16 kV HBM ESD rating arises from process-level junction design and layout, not auxiliary components. The MMBZ5245ELT3G relies solely on its PN junction for both regulation and ESD clamping - confirmed in the "Features" section and Electrical Characteristics table of the official datasheet.
Can MMBZ5245ELT3G be used in place of a 15 V Zener in through-hole designs?
The MMBZ5245ELT3G is strictly a surface-mount SOT-23 device and cannot replace through-hole Zeners like 1N4744A without PCB redesign. Its pinout (1-Anode, 2-NC, 3-Cathode) and 2.90 × 1.30 mm footprint differ fundamentally from axial or DO-41 packages. While functionally equivalent as a 15 V shunt regulator, the MMBZ5245ELT3G requires compatible SMT layout, stencil design, and reflow profile - not drop-in substitution in legacy through-hole assemblies.
What is the maximum continuous reverse current for MMBZ5245ELT3G at 25°C?
At TA = 25°C, the MMBZ5245ELT3G supports a maximum continuous reverse current of approximately 15 mA, derived from its 225 mW power rating and nominal 15 V Zener voltage (P = V × I → I = 225 mW / 15 V = 15 mA). This assumes adequate PCB copper area for thermal dissipation; derating applies above 25°C per the 1.8 mW/°C slope in the Maximum Ratings table. The MMBZ5245ELT3G must not exceed this limit to ensure long-term reliability.
Is MMBZ5245ELT3G qualified for automotive applications?
The MMBZ5245ELT3G itself is not AEC-Q101 qualified; only the SZ-prefix variants (e.g., SZMMBZ5245ELT1G) carry that qualification. The MMBZ5245ELT3G is rated for −65°C to +150°C junction temperature and meets industrial reliability standards, but lacks PPAP documentation and automotive-specific stress testing. For automotive use, engineers must select the SZMMBZ5245ELT1G variant - the MMBZ5245ELT3G is intended for commercial and industrial portable electronics.
MMBZ5245ELT3G 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)
MMBZ5245ELT3G FAQ
1.How can I place an order for MMBZ5245ELT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5245ELT3G 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 MMBZ5245ELT3G reliable?
The price and inventory of MMBZ5245ELT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5245ELT3G is usually 5 days.
3.What payment methods are accepted for MMBZ5245ELT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5245ELT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5245ELT3G?
MMBZ5245ELT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5245ELT3G 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 MMBZ5245ELT3G?
For technical support, including MMBZ5245ELT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5245ELT3G requirements.
6.How does Aetrix verify that MMBZ5245ELT3G is sourced from the original manufacturer or authorized distributors?
All MMBZ5245ELT3G 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 MMBZ5245ELT3G meets industry standards.
7.What is the process for return or replacement of MMBZ5245ELT3G?
All MMBZ5245ELT3G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5245ELT3G, 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 MMBZ5245ELT3G part is unused and in its original packaging.
Return procedure for MMBZ5245ELT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5245ELT3G Tags
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