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onsemi MMBZ5237ELT3G
- Part No.:
- MMBZ5237ELT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5237ELT3G.pdf
- Description:
- DIODE ZENER 8.2V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,993
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Product details
Overview
MMBZ5237ELT3G from onsemi is a 225 mW surface-mount Zener diode in SOT-23 package, rated for 8.2 V nominal reverse breakdown voltage at 20 mA test current, with 500 Ω maximum dynamic impedance and 0.25 μA leakage current at 6.5 V reverse bias. It serves as a precision voltage reference or overvoltage clamp in low-power portable electronics.
For engineers reviewing the MMBZ5237ELT3G datasheet, pinout, applications, or equivalent options, key selection criteria include its 8.2 V Zener voltage tolerance (±5%), 225 mW power rating on FR-5 board, Class 3 ESD robustness (>16 kV HBM), and SOT-23 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal voltage-regulating diode with cathode-anode polarity, where reverse-biased conduction begins near 8.2 V and maintains stable regulation across 20 mA test current and 5 mA to 20 mA operating range. Its thermal resistance is 556 °C/W on FR-5 board, limiting junction temperature rise under continuous DC load.
The MMBZ5237ELT3G features a no-connect terminal (Pin 2), enabling unambiguous anode/cathode identification and eliminating ambiguity in automated placement. Its 100% Pb-free construction complies with RoHS, and it meets AEC-Q101 stress testing requirements when ordered as SZ prefix variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.2 V nominal at 20 mA - defines precise clamping/reference point for low-voltage rail protection |
| Power Dissipation (PD) | 225 mW on FR-5 board - supports continuous regulation in space-constrained portable designs |
| Zener Impedance (ZZT) | 500 Ω max at 20 mA - ensures minimal output voltage variation under load transients |
| Leakage Current (IR) | 0.25 μA max at 6.5 V - guarantees negligible standby current draw in battery-powered systems |
| ESD Rating | Class 3 (>16 kV HBM) - withstands handling and assembly without damage in standard manufacturing environments |
| Package | SOT-23 (TO-236) - 2.90 × 1.30 × 1.00 mm footprint enables high-density routing and reflow compatibility |
| Junction Temp Range | −65°C to +150°C - supports operation in extended industrial and automotive ambient conditions |
Pinout & Package
SOT-23 plastic surface-mount package with void-free thermosetting case, corrosion-resistant finish, and UL 94 V-0 flammability rating. Cathode identified by band; maximum soldering temperature 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | DC current entry point during forward bias; connected to lower-potential node in Zener clamp configuration |
| 2 | No Connection | Internally unconnected - must remain floating; no PCB trace or pad required |
| 3 | Cathode | DC current exit point during reverse breakdown; tied to regulated voltage node or protection rail |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating | Enables stable voltage regulation without heatsinking in thin-profile handheld PCBs |
| Class 3 ESD Robustness | Eliminates need for external ESD protection diodes in front-end I/O circuits |
| Pb-Free Construction | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 |
| Optimized SOT-23 Footprint | Supports automated pick-and-place at >99.9% placement yield on standard SMT lines |
| Low Leakage at Low Bias | 0.25 μA @ 6.5 V allows use in ultra-low-power wake-up circuits without signal corruption |
Applications
| USB Port Overvoltage Protection | Li-ion Battery Voltage Monitor Reference |
|---|---|
Use Scenario: Clamping transient surges on USB D+ and D− lines during hot-plug events. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing fast-response voltage limiting before signal reaches USB transceiver. Use Value: Prevents latch-up or damage to 3.3 V tolerant PHY ICs using only 8.2 V breakdown threshold aligned with USB 2.0 common-mode limits. |
Use Scenario: Providing stable reference for ADC input in single-cell Li-ion fuel gauge circuits. IC Role / Device Role / Timing Role: Precision voltage reference source feeding comparator or SAR ADC reference divider network. Use Value: Delivers <±5% tolerance and <500 Ω dynamic impedance to maintain ADC linearity across 0–100% SoC range. |
| Smartphone RF Front-End Bias Clamp | Industrial Sensor Signal Conditioning |
Use Scenario: Protecting LNA input pins from ESD and RF-induced DC offset during antenna switching. IC Role / Device Role / Timing Role: Fast-reacting shunt clamp absorbing nanosecond-scale transients while preserving RF path integrity. Use Value: Leverages >16 kV HBM rating and sub-1 ns response to suppress ESD without degrading 2.4 GHz insertion loss. |
Use Scenario: Stabilizing excitation voltage for resistive bridge sensors in programmable logic controller analog input modules. IC Role / Device Role / Timing Role: Low-drift voltage reference establishing fixed bias for Wheatstone bridge excitation. Use Value: Maintains <0.25 μA leakage and ±5% VZ tolerance to ensure <0.1% full-scale error in 16-bit measurement systems. |
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-C8V2LT1G | Same 8.2 V nominal Zener, but 350 mW rating and higher ZZT (600 Ω) | Higher power dissipation margin; less suitable for ultra-thin PCBs due to thermal profile | Select when board layout allows larger thermal relief or higher surge energy absorption is needed |
| MMBZ5237BS | Same electrical specs but in SOD-323 package (1.7 × 1.25 × 0.95 mm), no Pin 2 NC | Smaller footprint but incompatible pinout; requires redesign of land pattern and stencil | Choose only if volume production demands smallest possible area and rework of layout is acceptable |
Compared with BZX84-C8V2LT1G and MMBZ5237BS, the MMBZ5237ELT3G offers optimal balance of compact SOT-23 footprint, verified 225 mW derating curve, and Pin 2 isolation for unambiguous orientation-making it preferred for high-mix consumer electronics manufacturing.
Availability
MMBZ5237ELT3G is available at Aetrix Electronics and suitable for cellular phone power management, handheld portable interface protection, and high-density PC board voltage clamping requiring stable component supply and full RoHS compliance.
Supply support for MMBZ5237ELT3G 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 silicon solutions for automotive, industrial, cloud, and IoT applications.
The MMBZ52xxELT3G series belongs to onsemi's precision Zener voltage regulator product line, engineered specifically for space-constrained, low-power portable electronics requiring reliable overvoltage protection and stable reference generation.
FAQ
What is the exact Zener voltage tolerance for MMBZ5237ELT3G?
The MMBZ5237ELT3G has a nominal Zener voltage of 8.2 V with minimum 7.79 V and maximum 8.61 V at 20 mA test current, corresponding to ±5% tolerance. This is confirmed in the Electrical Characteristics table on page 2 of the official onsemi datasheet (Rev. 9, August 2024), and applies under TA = 25°C with pulse testing per Note 4.
Does MMBZ5237ELT3G have a functional third pin?
No, Pin 2 of the MMBZ5237ELT3G is explicitly designated "No Connection" in the datasheet's pinout diagram (Style 8, page 2) and mechanical outline (page 6). It is internally unconnected and must remain electrically floating-no trace, via, or solder mask opening should be assigned to it in PCB layout.
Can MMBZ5237ELT3G replace MMBZ5237ELT1G in production?
Yes, MMBZ5237ELT3G and MMBZ5237ELT1G share identical electrical specifications, thermal ratings, and SOT-23 packaging. The only difference is packaging quantity: MMBZ5237ELT3G ships in 10,000-unit tape-and-reel versus 3,000 for MMBZ5237ELT1G. Both are Pb-free and RoHS-compliant, with no performance or reliability distinction.
What is the maximum continuous reverse current MMBZ5237ELT3G can handle?
The MMBZ5237ELT3G is rated for 225 mW total power dissipation on FR-5 board at 25°C ambient, derating linearly at 1.8 mW/°C above that temperature. At its 8.2 V Zener voltage, this corresponds to ~27.4 mA maximum continuous reverse current before exceeding PD limit-confirmed by calculation (225 mW ÷ 8.2 V ≈ 27.4 mA) and consistent with datasheet IZT = 20 mA test condition.
Is MMBZ5237ELT3G qualified for automotive applications?
The base MMBZ5237ELT3G is not automotive-qualified; however, the SZMMBZ5237ELT1G variant (same Zener voltage, SOT-23, 3,000/reel) is AEC-Q101 qualified and PPAP capable, as stated in the Features section (page 1). For automotive use, specify the SZ prefix part-not MMBZ5237ELT3G-to ensure qualification and controlled change management.
MMBZ5237ELT3G 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):
- 8.2 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 8 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 6.5 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)
MMBZ5237ELT3G FAQ
1.How can I place an order for MMBZ5237ELT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5237ELT3G 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 MMBZ5237ELT3G reliable?
The price and inventory of MMBZ5237ELT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5237ELT3G is usually 5 days.
3.What payment methods are accepted for MMBZ5237ELT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5237ELT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5237ELT3G?
MMBZ5237ELT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5237ELT3G 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 MMBZ5237ELT3G?
For technical support, including MMBZ5237ELT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5237ELT3G requirements.
6.How does Aetrix verify that MMBZ5237ELT3G is sourced from the original manufacturer or authorized distributors?
All MMBZ5237ELT3G 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 MMBZ5237ELT3G meets industry standards.
7.What is the process for return or replacement of MMBZ5237ELT3G?
All MMBZ5237ELT3G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5237ELT3G, 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 MMBZ5237ELT3G part is unused and in its original packaging.
Return procedure for MMBZ5237ELT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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