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onsemi MMBZ5245ELT1G
- Part No.:
- MMBZ5245ELT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5245ELT1G.pdf
- Description:
- DIODE ZENER 15V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,370
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Product details
Overview
MMBZ5245ELT1G from onsemi is a 15 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 nominal Zener voltage of 15.0 V at 8.5 mA test current, with dynamic impedance ≤600 Ω and leakage current ≤0.1 µA at 11 V reverse bias-used in power rail clamping for portable electronics and voltage reference circuits.
For engineers reviewing the MMBZ5245ELT1G datasheet, pinout, applications, or equivalent options, key selection criteria include its 15 V regulation tolerance (±0.75 V), ESD rating >16 kV HBM, thermal resistance of 556 °C/W on FR-5 board, and NC pin configuration enabling compact layout in high-density PCBs.
Technical Context
The MMBZ5245ELT1G operates as a two-terminal voltage reference device with anode (Pin 1) and cathode (Pin 3); Pin 2 is internally unconnected. Its Zener breakdown mechanism provides stable regulation across −65°C to +150°C junction temperature range, with temperature coefficient near zero at ~15 V (confirmed by Figure 1).
It supports pulse operation up to 225 W (8 × 20 µs waveform) and maintains ≤0.95 V forward voltage at 10 mA, enabling bidirectional protection in low-power signal lines. The device meets AEC-Q101 requirements when ordered as SZMMBZ5245ELT1G variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 14.25–15.75 V at 8.5 mA - ensures ±0.75 V regulation window for 15 V rail stabilization |
| Power Dissipation (PD) | 225 mW on FR-5 board - defines maximum continuous DC power handling without derating |
| Zener Impedance (ZZT) | ≤600 Ω at IZT = 8.5 mA - determines output voltage variation under load changes |
| Leakage Current (IR) | ≤0.1 µA at VR = 11 V - guarantees minimal standby current draw in battery-powered systems |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct integration into handheld interfaces without external ESD protection |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 - informs thermal design margin for ambient temperatures up to +85°C |
| Junction Temp Range | −65°C to +150°C - supports operation in automotive under-hood and industrial control environments |
Pinout & Package
SOT-23 (TO-236) package: 2.90 mm × 1.30 mm × 1.00 mm body, Pb-free, void-free thermoset plastic case with UL 94 V-0 flammability rating and cathode polarity band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | DC current entry point during forward conduction; connected to lower-potential node in Zener mode |
| 2 | No Connection | Internally isolated terminal - must remain unconnected on PCB to avoid parasitic coupling or reliability risk |
| 3 | Cathode | DC current exit point during forward conduction; tied to regulated voltage node in Zener configuration |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating | Enables use in low-power voltage references and overvoltage clamp circuits without heatsinking |
| ESD Robustness >16 kV HBM | Eliminates need for discrete TVS diodes in ESD-prone USB, audio, and sensor interface paths |
| NC Pin Architecture | Reduces routing complexity in dense layouts by removing requirement for third trace connection |
| Pb-Free & RoHS Compliant | Meets global environmental compliance mandates without performance trade-offs or soldering restrictions |
| Automated Assembly Optimized | Standard SOT-23 footprint and marking support high-yield pick-and-place and AOI inspection |
Applications
| USB Data Line Protection | Portable Device Power Rail Clamp |
|---|---|
|
Use Scenario: Clamping transient spikes on USB D+/D− lines during hot-plug events or ESD discharge. IC Role / Device Role / Timing Role: Bidirectional voltage limiter protecting transceiver I/O pins from overvoltage stress. Use Value: Leverages 0.95 V forward drop and 15 V reverse Zener threshold to confine signal swing within safe IC input limits while passing full-speed USB signaling. |
Use Scenario: Stabilizing 15 V supply rails in Bluetooth headsets and smart wearables with tight board area constraints. IC Role / Device Role / Timing Role: Precision shunt regulator maintaining stable reference for LDO feedback or ADC reference buffers. Use Value: Delivers ±0.75 V regulation accuracy at 8.5 mA with <0.1 µA leakage, minimizing quiescent current impact on battery life. |
| Industrial Sensor Signal Conditioning | Automotive Body Control Module Input Protection |
|
Use Scenario: Providing stable 15 V reference for analog front-end amplifiers in pressure or temperature sensors. IC Role / Device Role / Timing Role: Low-drift voltage reference source with near-zero TC at 15 V, reducing calibration drift over temperature. Use Value: Confirmed zero-crossing temperature coefficient near 15 V (Figure 1), enabling <±10 mV drift from −40°C to +85°C without trimming. |
Use Scenario: Protecting microcontroller GPIO inputs from load-dump transients in 12 V automotive subsystems. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp absorbing 225 W pulses (8 × 20 µs) per ISO 7637-2. Use Value: Withstands peak pulse energy without degradation, verified via 225 W non-repetitive rating and 150°C max junction temperature. |
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 Zener, but 300 mW rating and higher ZZT (≤1000 Ω); no NC pin (Pin 2 = cathode) | Higher power handling suits higher-current clamping; dual-cathode pinout requires layout change | Select when >225 mW continuous dissipation is needed and SOT-23 pinout flexibility allows dual-cathode routing |
| MMBZ5245BS | Same electrical specs, but in SOD-123 package (larger footprint, 3.7 mm × 1.6 mm) and 350 mW rating | Improved thermal performance (RJA ≈ 300 °C/W) for sustained power dissipation; incompatible with SOT-23 land pattern | Choose for higher-reliability industrial designs where board space permits larger package and enhanced thermal margin is critical |
Compared with BZX84-C15LT1G and MMBZ5245BS, the MMBZ5245ELT1G offers optimal balance of ultra-compact SOT-23 size, NC-pin simplification, and verified 15 V regulation stability-making it preferred for high-density portable and automotive ECUs where layout efficiency and ESD robustness are prioritized over raw power headroom.
Availability
MMBZ5245ELT1G is available at Aetrix Electronics and suitable for USB interface protection, portable device power rail clamping, and industrial sensor reference applications requiring stable component supply and long-term lifecycle support.
Supply support for MMBZ5245ELT1G 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and consumer markets.
The MMBZ52xxELT1G series targets space-constrained, high-reliability voltage regulation-designed specifically for cellular phones, handheld portables, and high-density PC boards where miniaturization and ESD resilience are critical.
FAQ
What is the Zener voltage tolerance of MMBZ5245ELT1G at 8.5 mA test current?
The MMBZ5245ELT1G has a guaranteed Zener voltage range of 14.25 V to 15.75 V at IZT = 8.5 mA, corresponding to ±0.75 V absolute 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 and applies under TA = 25°C conditions.
Is Pin 2 of MMBZ5245ELT1G electrically connected internally?
No, Pin 2 of the MMBZ5245ELT1G is a No Connection (NC) terminal-internally isolated and not bonded to any die structure. The datasheet explicitly defines the pinout as "1-Anode, 2-NC, 3-Cathode" on pages 2 and 4, and mechanical drawings confirm Style 8 configuration. PCB layout must leave Pin 2 unconnected.
Does MMBZ5245ELT1G meet automotive qualification standards?
The standard MMBZ5245ELT1G is not AEC-Q101 qualified; however, the SZMMBZ5245ELT1G variant-identical in all electrical and mechanical specifications-is explicitly rated for automotive applications, with PPAP capability and site-specific process controls. Engineers requiring automotive compliance must specify the SZ-prefix version.
What is the maximum allowable reverse voltage before significant leakage occurs in MMBZ5245ELT1G?
Per the datasheet, MMBZ5245ELT1G exhibits ≤0.1 µA leakage current at VR = 11 V. At 14 V (just below nominal Zener voltage), leakage remains sub-microampere-confirming effective blocking up to ~93% of VZ. Operation above 14 V enters soft breakdown and should be avoided for stable regulation.
Can MMBZ5245ELT1G be used for bidirectional ESD protection?
Yes-MMBZ5245ELT1G functions bidirectionally: forward conduction (anode-to-cathode) clamps at ≤0.95 V, while reverse Zener action clamps at ~15 V. Its >16 kV HBM ESD rating and symmetric I-V behavior make it suitable for differential line protection such as USB or RS-485, provided layout minimizes parasitic inductance.
MMBZ5245ELT1G 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):
- 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)
MMBZ5245ELT1G FAQ
1.How can I place an order for MMBZ5245ELT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5245ELT1G 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 MMBZ5245ELT1G reliable?
The price and inventory of MMBZ5245ELT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5245ELT1G is usually 5 days.
3.What payment methods are accepted for MMBZ5245ELT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5245ELT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5245ELT1G?
MMBZ5245ELT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5245ELT1G 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 MMBZ5245ELT1G?
For technical support, including MMBZ5245ELT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5245ELT1G requirements.
6.How does Aetrix verify that MMBZ5245ELT1G is sourced from the original manufacturer or authorized distributors?
All MMBZ5245ELT1G 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 MMBZ5245ELT1G meets industry standards.
7.What is the process for return or replacement of MMBZ5245ELT1G?
All MMBZ5245ELT1G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5245ELT1G, 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 MMBZ5245ELT1G part is unused and in its original packaging.
Return procedure for MMBZ5245ELT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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