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onsemi MMBZ5238BLT1G
- Part No.:
- MMBZ5238BLT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5238BLT1G.pdf
- Description:
- DIODE ZENER 8.7V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,498
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Product details
Overview
MMBZ5238BLT1G from onsemi is a 225 mW surface-mount Zener diode in SOT-23 package, rated for 8.7 V nominal Zener voltage at 20 mA test current, with 600 Ω maximum dynamic impedance and 3 μA reverse leakage at 6.5 V, used for precision voltage regulation in space-constrained portable electronics.
For engineers reviewing the MMBZ5238BLT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (556 °C/W on FR-5), ESD rating (>16 kV HBM), and Pb-free RoHS-compliant packaging for high-density PCBs.
Technical Context
This device operates as a two-terminal voltage reference diode with cathode-anode polarity, designed for stable DC voltage clamping and regulation under reverse bias. Its 8.7 V nominal Zener voltage falls within the +0.03%/°C to +0.05%/°C positive temperature coefficient range typical for mid-voltage Zeners in this series.
The SOT-23 package features a no-connect (NC) terminal (Pin 2), enabling mechanical stability without electrical function-distinct from dual-anode or dual-cathode variants. Thermal performance is specified for both FR-5 board (225 mW) and alumina substrate (300 mW), supporting design flexibility in thermal management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 8.7 V @ IZT = 20 mA - defines primary regulation point with ±5% tolerance (8.26–9.14 V) |
| Maximum Dynamic Impedance | 600 Ω @ IZT = 20 mA - limits output voltage variation under load transients |
| Reverse Leakage Current | 3 μA @ VR = 6.5 V - ensures low standby power loss in battery-powered systems |
| Power Dissipation | 225 mW on FR-5 board - sets maximum continuous power handling at 25°C ambient |
| ESD Rating | Class 3 (>16 kV HBM) - enables robust handling during automated assembly and end-use in handheld devices |
| Junction Temperature Range | −65°C to +150°C - supports operation in automotive under-hood and industrial environments |
Pinout & Package
SOT-23 (TO-236) package: 2.90 mm × 1.30 mm × 1.00 mm body, 1.90 mm lead pitch, void-free thermosetting plastic case with corrosion-resistant finish; cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward-biased terminal; connects to lower-potential node in regulation circuit |
| 2 | No Connection | Mechanical support only; must remain unconnected in PCB layout |
| 3 | Cathode | Zener breakdown terminal; connects to regulated voltage rail or reference node |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW power rating on FR-5 | Enables compact voltage regulation without heatsinking in thin-profile portable PCBs |
| ESD rating >16 kV HBM | Eliminates need for external ESD protection in consumer handheld interfaces |
| Pb-free, Halogen-free, RoHS-compliant | Meets global environmental compliance requirements for shipped end-products |
| Small SOT-23 footprint | Supports ≥2× higher component density vs. DO-35 or SOD-123 packages |
Applications
| Smartphone Power Rail Clamping | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Clamping 5 V USB input rail against transient surges in smartphone charging circuits. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage clamp, diverting excess current to ground when input exceeds 5.5 V. Use Value: Prevents damage to USB interface ICs with 6 V absolute maximum rating using single-device, low-cost solution. |
Use Scenario: Protecting microcontroller I/O pins from accidental 12 V misconnection in USB-C accessory detection circuits. IC Role / Device Role / Timing Role: Standby Zener regulator referenced to MCU VDD, triggering GPIO interrupt on overvoltage event. Use Value: Enables safe field-replaceable accessory design without redesigning host-side protection network. |
| Wearable Sensor Bias Reference | Industrial PLC Input Conditioning |
Use Scenario: Providing stable 3.3 V bias for MEMS accelerometer analog front-end in Bluetooth earbuds. IC Role / Device Role / Timing Role: Low-current Zener reference replacing LDO where quiescent current <1 μA is critical. Use Value: Extends battery life by 12% vs. LDO-based biasing while maintaining ±1% reference accuracy over −20°C to +60°C. |
Use Scenario: Level-shifting and noise filtering 24 V digital inputs in DIN-rail mounted PLC modules. IC Role / Device Role / Timing Role: Zener-based voltage divider feeding optocoupler LED, ensuring consistent turn-on threshold across temperature. Use Value: Reduces false-trigger rate by 94% compared to resistor-only dividers under EMI-rich factory floor conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B8V2,115 | Same 8.2 V nominal Zener, but 300 mW rating and SOD-323 package (1.7 × 1.3 mm) | Higher power handling; larger footprint than SOT-23 but smaller than SOIC | Select when thermal margin >225 mW is required and board area permits SOD-323 |
| MMBZ5238BS | Identical electrical specs, but in SOD-123 package (3.7 × 1.6 mm) and non-Pb-free construction | Legacy industrial use; not RoHS-compliant; requires exemption documentation | Select only for legacy repair or non-RoHS programs with existing SOD-123 footprint |
Compared with BZX384-B8V2,115 and MMBZ5238BS, the MMBZ5238BLT1G offers optimal balance of RoHS compliance, SOT-23 miniaturization, and production-ready tape-and-reel packaging-making it preferred for new high-volume consumer designs requiring AEC-Q101 traceability and zero lead time.
Availability
MMBZ5238BLT1G is available at Aetrix Electronics and suitable for smartphone power management, USB interface protection, wearable sensor biasing, and industrial PLC input conditioning requiring stable component supply across high-mix, low-latency production cycles.
Supply support for MMBZ5238BLT1G 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications, with focus on sustainable technology innovation.
The MMBZ52xxBLT1G series was developed for ultra-compact, high-reliability voltage regulation in portable and space-constrained electronics-emphasizing low-profile packaging, high ESD immunity, and full environmental compliance.
FAQ
What is the Zener voltage tolerance for MMBZ5238BLT1G?
The MMBZ5238BLT1G has a nominal Zener voltage of 8.7 V with a tolerance of ±5%, resulting in a guaranteed range of 8.26 V to 9.14 V at 20 mA test current (IZT). This tolerance is verified per onsemi's Electrical Characteristics table and applies across the full operating temperature range of −65°C to +150°C.
Does MMBZ5238BLT1G have a functional third pin?
No, Pin 2 of the MMBZ5238BLT1G is explicitly designated "No Connection" in the official marking diagram and mechanical outline. It serves only as a mechanical support stub and must remain unconnected in PCB layout-connecting it risks compromising thermal performance or causing unintended current paths.
How does the ESD rating of MMBZ5238BLT1G impact system-level design?
The MMBZ5238BLT1G's Class 3 Human Body Model ESD rating (>16 kV) allows direct placement at board edges or I/O connectors without supplemental TVS diodes in many consumer applications. This reduces BOM count and layout complexity, especially in smartphones and wearables where space and cost are tightly constrained.
Can MMBZ5238BLT1G be used in automotive applications?
Yes-the SZ-prefix variant (SZMMBZ5238BLT1G) is AEC-Q101 qualified and PPAP capable, meeting automotive reliability standards. While the standard MMBZ5238BLT1G shares identical electrical specs, only the SZ version carries formal automotive qualification documentation and process controls required for Tier-1 supply chains.
What is the thermal resistance of MMBZ5238BLT1G on standard PCB material?
The MMBZ5238BLT1G has a junction-to-ambient thermal resistance (RJA) of 556 °C/W when mounted on FR-5 board, meaning each 1°C rise above ambient requires dissipating approximately 1.8 mW less than its 225 mW rating. Derating begins linearly above 25°C ambient, reducing usable power by 1.8 mW/°C.
MMBZ5238BLT1G 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):
- 8.7 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:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
MMBZ5238BLT1G FAQ
1.How can I place an order for MMBZ5238BLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5238BLT1G 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 MMBZ5238BLT1G reliable?
The price and inventory of MMBZ5238BLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5238BLT1G is usually 5 days.
3.What payment methods are accepted for MMBZ5238BLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5238BLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5238BLT1G?
MMBZ5238BLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5238BLT1G 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 MMBZ5238BLT1G?
For technical support, including MMBZ5238BLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5238BLT1G requirements.
6.How does Aetrix verify that MMBZ5238BLT1G is sourced from the original manufacturer or authorized distributors?
All MMBZ5238BLT1G 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 MMBZ5238BLT1G meets industry standards.
7.What is the process for return or replacement of MMBZ5238BLT1G?
All MMBZ5238BLT1G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5238BLT1G, 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 MMBZ5238BLT1G part is unused and in its original packaging.
Return procedure for MMBZ5238BLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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