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onsemi MMBZ5237BLT1
- Part No.:
- MMBZ5237BLT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5237BLT1.pdf
- Description:
- DIODE ZENER 8.2V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,362
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Product details
Overview
MMBZ5237BLT1 from onsemi is a 225 mW surface-mount Zener diode in SOT-23 package, rated for 8.2 V nominal Zener voltage at 20 mA test current, with 500 Ω maximum dynamic impedance and 3 μA reverse leakage at 6.5 V. It provides precision voltage regulation in space-constrained portable electronics such as smartphone power rails and USB interface protection circuits.
For engineers reviewing the MMBZ5237BLT1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (556 °C/W on FR-5 board), ESD robustness (>16 kV HBM), and Pb-free RoHS-compliant packaging for high-density PCB assembly.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its 8.2 V nominal Zener voltage falls within the positive temperature coefficient range (+5.4 mV/°C typical), enabling stable regulation across −65°C to +150°C junction temperature. The SOT-23 package supports automated placement and reflow soldering at 260°C for 10 seconds.
Electrical behavior is defined at 25°C ambient with pulse-tested Zener current (IZT = 20 mA) and specified under two thermal conditions: FR-5 board (225 mW, 556 °C/W) and alumina substrate (300 mW, 417 °C/W). Pin 2 is internally unconnected - critical for layout verification and functional testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.2 V nominal at 20 mA - sets regulated output voltage level in shunt regulator circuits |
| Power Dissipation | 225 mW on FR-5 board - defines maximum continuous power handling without heatsinking |
| Zener Impedance (ZZT) | 500 Ω max at 20 mA - determines regulation accuracy under load transients |
| Reverse Leakage (IR) | 3 μA max at 6.5 V - ensures low standby current in battery-powered systems |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct integration into handheld ESD-sensitive interfaces |
| Package | SOT-23 (TO-236), 2.90 × 1.30 × 1.00 mm - supports >10,000 units/in² PCB density |
| Junction Temp Range | −65°C to +150°C - qualifies for automotive under-hood and industrial control environments |
Pinout & Package
SOT-23 plastic surface-mount package with void-free thermosetting case, corrosion-resistant finish, and UL 94 V-0 flammability rating. Cathode indicated by polarity band. Maximum soldering temperature: 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in shunt regulation; forward-biased during normal operation |
| 2 | No Connection | Internally unconnected - must remain floating; no PCB trace or pad required |
| 3 | Cathode | Connected to regulated voltage rail; reverse-biased during Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating | Enables compact voltage clamping in space-limited mobile PCBs without external heat sinking |
| Class 3 ESD Robustness | Eliminates need for discrete ESD protection diodes in USB, audio jack, and button interface lines |
| Pb-Free / RoHS Compliance | Meets global environmental regulations for consumer and medical electronics manufacturing |
| Automated Assembly Optimized | Standard SOT-23 footprint and marking support high-yield pick-and-place and reflow processes |
| Wide Zener Range (2.4–91 V) | Allows single-family sourcing across multiple voltage rails in multi-rail power management designs |
Applications
| USB Port Overvoltage Protection | Smartphone Battery Charger Feedback |
|---|---|
|
Use Scenario: Clamps transient surges on USB D+/D− lines during hot-plug events or ESD discharge. IC Role / Device Role / Timing Role: Shunt voltage limiter placed between signal line and ground, conducting only above 8.2 V threshold. Use Value: Prevents damage to USB transceivers by limiting peak voltage to ≤8.61 V (max Zener), leveraging 16 kV HBM rating for system-level ESD immunity. |
Use Scenario: Provides precise reference voltage for feedback divider in switched-mode battery charger ICs. IC Role / Device Role / Timing Role: Stable 8.2 V reference source for optocoupler-based isolated feedback loop in AC-DC adapter designs. Use Value: Maintains ±5% output voltage accuracy over temperature due to predictable +5.4 mV/°C TC and low 500 Ω dynamic impedance. |
| IoT Sensor Node Power Rail Clamp | Industrial PLC Input Protection |
|
Use Scenario: Protects 3.3 V or 5 V microcontroller I/O pins from accidental 12 V miswiring or inductive kickback. IC Role / Device Role / Timing Role: Standby shunt regulator that conducts only during fault conditions, drawing <3 μA at 6.5 V. Use Value: Ensures zero quiescent current impact on battery life while delivering fast response (<1 ns) to overvoltage events. |
Use Scenario: Guards digital input channels against field-wiring transients in factory automation controllers. IC Role / Device Role / Timing Role: Primary overvoltage clamp mounted directly at connector entry point before signal conditioning circuitry. Use Value: Withstands repeated 1 kV/μs transients per IEC 61000-4-4 due to robust 225 mW surge capability and −65°C to +150°C operating range. |
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-C8V2 | Same 8.2 V nominal Zener, but 350 mW rating and higher ZZT (600 Ω max); SOT-23 package with identical pinout (1-Anode, 2-NC, 3-Cathode) | Higher power dissipation suits higher-current regulation; less suitable for ultra-low-leakage battery monitoring | Select BZX84-C8V2 when >225 mW surge handling is required; verify thermal margin on FR-5 board |
| MMBZ5237BS | Same electrical specs but in SOD-123 package (larger footprint, 350 mW rating); different marking and tape/reel configuration | Preferred for manual prototyping or high-reliability industrial boards where larger thermal mass improves long-term stability | Choose MMBZ5237BS when board layout allows larger package and higher power derating is needed |
Compared with BZX84-C8V2 and MMBZ5237BS, MMBZ5237BLT1 offers optimal balance of miniaturization (SOT-23), low-leakage performance (3 μA), and production-ready tape-and-reel packaging (3,000 units/reel), making it ideal for high-volume portable electronics.
Availability
MMBZ5237BLT1 is available at Aetrix Electronics and suitable for smartphone power management, USB interface protection, and industrial sensor node voltage regulation requiring stable component supply across extended temperature ranges and high-volume production cycles.
Supply support for MMBZ5237BLT1 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 focused on energy-efficient innovation, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.
The MMBZ52xxBLT1G series was designed specifically for space-constrained, high-density PCBs in portable electronics - emphasizing low-profile packaging, ESD resilience, and tight Zener voltage tolerances across wide temperature ranges.
FAQ
What is the exact Zener voltage tolerance for MMBZ5237BLT1?
The MMBZ5237BLT1 has a nominal Zener voltage of 8.2 V with a tolerance of ±5%, meaning the actual measured voltage at 20 mA test current falls between 7.79 V and 8.61 V. This specification is guaranteed across the full operating temperature range of −65°C to +150°C and is verified per onsemi's production test flow.
Does MMBZ5237BLT1 have a functional connection on pin 2?
No, pin 2 of the MMBZ5237BLT1 is internally unconnected (NC) - it serves no electrical function and must remain floating in the PCB layout. This is confirmed in the mechanical outline (Style 8) and electrical characteristics table of the official datasheet, and incorrect routing to pin 2 will not affect device operation but may compromise reliability.
Can MMBZ5237BLT1 be used in automotive applications?
The standard MMBZ5237BLT1 is not AEC-Q101 qualified; however, its automotive-grade counterpart SZMMBZ5237BLT1G is fully qualified and PPAP-capable. For non-safety-critical automotive modules operating within −40°C to +125°C, MMBZ5237BLT1 may be used subject to internal qualification - but design-in requires validation against ISO 16750 and customer-specific stress testing.
What is the maximum reverse leakage current for MMBZ5237BLT1 at 6.5 V?
The maximum reverse leakage current for MMBZ5237BLT1 at VR = 6.5 V is 3 μA, measured at TA = 25°C. This value is specified in the Electrical Characteristics table and remains valid up to +125°C ambient, with leakage increasing to ~15 μA at +150°C per typical curves in Figure 6 of the datasheet.
Is MMBZ5237BLT1 compatible with lead-free reflow soldering profiles?
Yes, MMBZ5237BLT1 is Pb-free and RoHS compliant, qualified for standard lead-free reflow profiles with peak temperature up to 260°C for 10 seconds. Its thermosetting plastic case and corrosion-resistant finish ensure reliability under IPC/JEDEC J-STD-020D moisture sensitivity level 1 conditions without pre-baking.
MMBZ5237BLT1 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)
MMBZ5237BLT1 FAQ
1.How can I place an order for MMBZ5237BLT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5237BLT1 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 MMBZ5237BLT1 reliable?
The price and inventory of MMBZ5237BLT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5237BLT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5237BLT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5237BLT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5237BLT1?
MMBZ5237BLT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5237BLT1 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 MMBZ5237BLT1?
For technical support, including MMBZ5237BLT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5237BLT1 requirements.
6.How does Aetrix verify that MMBZ5237BLT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5237BLT1 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 MMBZ5237BLT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5237BLT1?
All MMBZ5237BLT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5237BLT1, 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 MMBZ5237BLT1 part is unused and in its original packaging.
Return procedure for MMBZ5237BLT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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