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onsemi MMBZ5235ELT1G
- Part No.:
- MMBZ5235ELT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5235ELT1G.pdf
- Description:
- DIODE ZENER 6.8V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,588
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Product details
Overview
MMBZ5235ELT1G from onsemi is a 225 mW surface-mount Zener diode in SOT-23 package, rated for 6.8 V nominal reverse breakdown voltage at 20 mA test current, with 5 Ω dynamic impedance and 3 μA leakage current at 5 V reverse bias. It provides precision voltage regulation in space-constrained power rails for portable electronics and high-density PCBs.
For engineers reviewing the MMBZ5235ELT1G datasheet, pinout, applications, or equivalent options, this device serves as a low-power, ESD-hardened (Class 3, >16 kV HBM) voltage reference and overvoltage clamp in battery-powered systems where thermal dissipation and board area are critical constraints.
Technical Context
The MMBZ5235ELT1G operates as a two-terminal voltage reference diode with cathode-anode polarity, featuring a non-connected terminal (Pin 2) in its SOT-23 package. Its Zener mechanism delivers stable 6.8 V regulation under DC and pulsed conditions up to 225 W peak (8 × 20 µs), with thermal resistance of 556 °C/W on FR-5 board.
It exhibits a temperature coefficient near zero (±0.002 V/°C typical for 6.8 V devices per Figure 1), enabling stable reference performance across −65°C to +150°C junction range. The device meets AEC-Q101 requirements when ordered as SZ prefix variant and supports Pb-free reflow soldering up to 260°C for 10 seconds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.46–7.14 V @ IZT = 20 mA - defines regulated output voltage tolerance band for precision clamping |
| Zener Impedance (ZZT) | 5 Ω @ IZT = 20 mA - ensures minimal voltage deviation under load transients |
| Power Dissipation (PD) | 225 mW @ TA = 25°C on FR-5 - sets maximum continuous DC power handling in standard PCB layout |
| Leakage Current (IR) | 3 μA @ VR = 5 V - guarantees low standby current in battery-critical circuits |
| ESD Rating | Class 3 (>16 kV HBM) - enables robust operation in handheld and ESD-prone environments without external protection |
| Junction Temp Range | −65°C to +150°C - supports automotive under-hood and industrial ambient deployments |
Pinout & Package
SOT-23 (TO-236) plastic surface-mount package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting case with corrosion-resistant finish; polarity marked by cathode band; Pb-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; carries forward current during conduction |
| 2 | No Connection | Internally unconnected; must remain floating-no PCB trace or pad required |
| 3 | Cathode | Connected to higher-potential node; defines regulated voltage reference point at cathode-to-anode drop |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating | Enables use in compact 3.3 V/5 V rail clamping without heatsinking on standard FR-5 PCB |
| Low Dynamic Impedance | 5 Ω ZZT minimizes output voltage shift under ±10 mA load variation, improving regulation accuracy |
| Class 3 ESD Hardness | Withstands >16 kV human-body-model discharge-eliminates need for discrete TVS in many portable designs |
| Pb-Free & RoHS Compliant | Meets global environmental compliance mandates without derating or process change for lead-free assembly |
| Optimized for Automated Assembly | Standard SOT-23 footprint and marking support high-yield pick-and-place and AOI inspection |
Applications
| USB Port Protection | Smartphone Battery Monitoring |
|---|---|
Use Scenario: Clamping transient surges on USB D+/D− lines during hot-plug events. IC Role / Device Role / Timing Role: Voltage clamp protecting USB transceiver I/O pins from ESD and overvoltage. Use Value: Leverages 16 kV HBM rating and 5 Ω ZZT to limit clamped voltage to <7.5 V during 8/20 µs surge, preserving PHY integrity. |
Use Scenario: Providing stable reference for fuel-gauge ADC in lithium-ion battery management. IC Role / Device Role / Timing Role: Precision 6.8 V Zener reference for ratiometric voltage measurement of cell voltage. Use Value: Tight 6.46–7.14 V tolerance and low 3 μA leakage ensure <0.5% reference error over temperature and battery discharge cycle. |
| IoT Sensor Node Power Rail | Industrial PLC Input Conditioning |
Use Scenario: Regulating 3.3 V LDO feedback divider or biasing op-amp references in ultra-low-power sensors. IC Role / Device Role / Timing Role: Low-quiescent-current voltage reference source for analog signal chain biasing. Use Value: 225 mW rating and −65°C to +150°C operation allow reliable use in unheated outdoor sensor enclosures. |
Use Scenario: Overvoltage protection for 24 V digital input channels exposed to field wiring transients. IC Role / Device Role / Timing Role: Clamp diode shunting induced spikes before they reach optocoupler or MCU GPIO. Use Value: 225 W peak pulse capability absorbs 1 kV/1 A transients per IEC 61000-4-5 Level 3 without degradation. |
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-C6V8LT1G | Same 6.8 V nominal, but 350 mW PD, 15 Ω ZZT, and no Class 3 ESD rating | Higher power margin but less precise regulation and lower ESD immunity | Prefer when board space allows larger thermal mass and ESD risk is mitigated externally |
| MMBZ5235BS | Same electrical specs but in SOD-123 package (3.7 × 2.7 × 1.2 mm), no NC pin, 300 mW PD | Larger footprint, higher power, no Pin 2 isolation-unsuitable for ultra-dense layouts | Choose when higher continuous power is needed and SOT-23 pinout compatibility is not required |
Compared with BZX84-C6V8LT1G and MMBZ5235BS, the MMBZ5235ELT1G uniquely balances ultra-compact SOT-23 size, low 5 Ω impedance, and certified 16 kV ESD hardness-making it optimal for next-gen portable and space-limited industrial modules where regulation fidelity and ruggedness coexist.
Availability
MMBZ5235ELT1G is available at Aetrix Electronics and suitable for USB protection, smartphone battery monitoring, IoT sensor node power rails, and industrial PLC input conditioning requiring stable component supply and full traceability.
Supply support for MMBZ5235ELT1G 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 edge applications.
The MMBZ52xxELT1G series belongs to onsemi's precision Zener regulator portfolio, engineered specifically for miniaturized, high-reliability voltage reference and clamping in portable, automotive, and industrial electronics.
FAQ
What is the Zener voltage tolerance of MMBZ5235ELT1G at 20 mA test current?
The MMBZ5235ELT1G has a guaranteed Zener voltage range of 6.46 V (minimum) to 7.14 V (maximum) when tested at IZT = 20 mA and TA = 25°C. This ±5% tolerance band ensures predictable clamping behavior in production circuits without requiring post-manufacturing calibration.
Does MMBZ5235ELT1G have a functional third pin, and how should Pin 2 be handled on the PCB?
No-MMBZ5235ELT1G uses only Pins 1 (Anode) and 3 (Cathode); Pin 2 is internally unconnected (NC). On the PCB, Pin 2 pad must remain unconnected-no trace, via, or copper pour should contact it to avoid parasitic coupling or assembly defects.
Can MMBZ5235ELT1G replace older MMBZ5235ELT1 parts in existing designs?
Yes-MMBZ5235ELT1G is the Pb-free, RoHS-compliant successor to MMBZ5235ELT1, with identical electrical specs, SOT-23 footprint, and pinout. The "G" suffix denotes green packaging; no layout or firmware changes are needed for drop-in replacement.
What is the maximum allowable reverse voltage before significant leakage occurs in MMBZ5235ELT1G?
At VR = 5 V, MMBZ5235ELT1G guarantees leakage current ≤3 μA. Leakage rises exponentially beyond this; operation above 5 V in non-Zener mode risks exceeding 100 μA and compromising low-power sleep states-designers should limit reverse bias to ≤5 V unless actively regulating at VZ.
How does the thermal resistance of MMBZ5235ELT1G affect its usable power in real-world PCB layouts?
With RJA = 556 °C/W on FR-5 board, dissipating 225 mW raises junction temperature by ~125°C above ambient. At TA = 25°C, TJ reaches ~150°C-near max rating. Derating to 150 mW or using thermal relief pads is recommended for sustained operation above 40°C ambient.
MMBZ5235ELT1G 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):
- 6.8 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 5 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)
MMBZ5235ELT1G FAQ
1.How can I place an order for MMBZ5235ELT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5235ELT1G 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 MMBZ5235ELT1G reliable?
The price and inventory of MMBZ5235ELT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5235ELT1G is usually 5 days.
3.What payment methods are accepted for MMBZ5235ELT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5235ELT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5235ELT1G?
MMBZ5235ELT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5235ELT1G 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 MMBZ5235ELT1G?
For technical support, including MMBZ5235ELT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5235ELT1G requirements.
6.How does Aetrix verify that MMBZ5235ELT1G is sourced from the original manufacturer or authorized distributors?
All MMBZ5235ELT1G 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 MMBZ5235ELT1G meets industry standards.
7.What is the process for return or replacement of MMBZ5235ELT1G?
All MMBZ5235ELT1G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5235ELT1G, 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 MMBZ5235ELT1G part is unused and in its original packaging.
Return procedure for MMBZ5235ELT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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