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onsemi MMBZ5237BLT1H
- Part No.:
- MMBZ5237BLT1H
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5237BLT1H.pdf
- Description:
- DIODE ZENER 8.2V 225MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:66,000
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Product details
Overview
MMBZ5237BLT1H 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% voltage tolerance. It provides precision voltage regulation in space-constrained power management circuits such as portable device battery protection and low-voltage reference generation.
For engineers reviewing the MMBZ5237BLT1H datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy (7.79–8.61 V), thermal resistance (556 °C/W on FR-5 board), ESD robustness (>16 kV HBM), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This device operates as a two-terminal voltage reference, conducting in reverse breakdown to clamp voltage across its cathode-anode terminals. Its Zener voltage exhibits a positive temperature coefficient near 8.2 V (≈+3.5 mV/°C), enabling stable regulation over −65°C to +150°C junction temperature range.
The SOT-23 package features a no-connect (NC) terminal (Pin 2), simplifying PCB layout while maintaining mechanical robustness and automated assembly compatibility. Thermal performance is specified for both FR-5 board (225 mW @ 25°C) and alumina substrate (300 mW @ 25°C), supporting diverse thermal environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.79–8.61 V at IZT = 20 mA - defines precise clamping threshold for overvoltage protection and reference circuits |
| Power Dissipation | 225 mW on FR-5 board - sets maximum continuous power handling without derating at 25°C ambient |
| Zener Impedance (ZZT) | ≤500 Ω at IZT = 20 mA - determines output voltage stability under varying load current |
| Leakage Current (IR) | ≤3 μA at VR = 6.5 V - ensures minimal standby power loss in high-impedance bias networks |
| ESD Rating | Class 3 (>16 kV HBM) - guarantees robustness against electrostatic discharge during handling and assembly |
| Junction Temp Range | −65°C to +150°C - supports operation in automotive under-hood and industrial control environments |
| Forward Voltage | ≤0.95 V at IF = 10 mA - enables use as low-drop rectifier or polarity protection element |
Pinout & Package
SOT-23 plastic surface-mount package (Case 318, Style 8), void-free transfer-molded thermosetting construction with corrosion-resistant, solderable finish. Maximum soldering temperature: 260°C for 10 seconds. Cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; carries forward current when used as rectifier |
| 2 | No Connection | Internally unconnected; must remain floating on PCB - no routing or grounding allowed |
| 3 | Cathode | Connected to higher-potential node; voltage regulation occurs between Pin 3 and Pin 1 during reverse breakdown |
Key Features
| Feature | Design Value |
|---|---|
| Pb-Free, Halogen-Free, RoHS Compliant | Meets global environmental regulations without compromising solderability or long-term reliability |
| AEC-Q101 Qualified | Validated for automotive applications including engine control units and body electronics |
| Small SOT-23 Footprint | Enables placement in high-density layouts where board area is constrained (e.g., smartphone PMIC rails) |
| 225 mW Power Rating | Supports low-power voltage clamping without heatsinking in battery-powered devices |
| Class 3 ESD Protection | Eliminates need for external ESD suppression in handheld product front-end circuits |
Applications
| Portable Device Battery Protection | Low-Voltage Microcontroller Reference |
|---|---|
|
Use Scenario: Clamping surge transients on Li-ion battery charge path in Bluetooth earbuds. IC Role / Device Role / Timing Role: Zener voltage regulator acting as overvoltage shunt protector for battery management IC input. Use Value: Prevents >8.61 V spikes from damaging sensitive analog front-end circuitry with <3 μA leakage at 6.5 V. |
Use Scenario: Providing stable 8.2 V reference for ADC voltage scaling in medical wearable sensor nodes. IC Role / Device Role / Timing Role: Precision voltage reference source for analog-to-digital conversion calibration. Use Value: Delivers ±3% voltage tolerance and ≤500 Ω dynamic impedance to maintain ADC accuracy across temperature. |
| Automotive Cabin Control Interface | Industrial Sensor Signal Conditioning |
|
Use Scenario: Regulating supply rail for touch-button controller in vehicle infotainment panel. IC Role / Device Role / Timing Role: Zener-based voltage clamp ensuring consistent logic-level thresholds despite battery voltage fluctuations. Use Value: AEC-Q101 qualification and −65°C to +150°C operation guarantee reliability in wide-temperature cabin environments. |
Use Scenario: Biasing op-amp input stage in 4–20 mA loop-powered pressure transmitter. IC Role / Device Role / Timing Role: Stable voltage reference establishing common-mode operating point for signal conditioning amplifier. Use Value: Low 225 mW dissipation avoids thermal drift in sealed industrial enclosures with limited airflow. |
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 300 mW rating and 60 Ω ZZT; SOT-23 package with identical pinout (Pin 2 NC) | Higher power handling and lower impedance suit higher-current regulation; not AEC-Q101 qualified | Select for non-automotive designs requiring tighter regulation under variable load |
| SZMMBZ5237BLT1G | Identical electrical specs and AEC-Q101 qualification; differs only in SZ-prefix denoting automotive-specific traceability and PPAP support | Required for Tier 1 automotive BOMs mandating full process control documentation | Choose when full PPAP compliance and site-controlled manufacturing are contractually required |
Compared with MMBZ5237BLT1H, BZX84-C8V2LT1G offers better regulation at higher currents but lacks automotive qualification, while SZMMBZ5237BLT1G provides identical performance with enhanced supply-chain traceability for OEM automotive programs.
Availability
MMBZ5237BLT1H is available at Aetrix Electronics and suitable for portable electronics, automotive cabin controls, and industrial sensor interfaces requiring stable component supply with guaranteed long-term availability.
Supply support for MMBZ5237BLT1H 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, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MMBZ52xxBLT1G series was designed specifically for compact, high-reliability voltage regulation in space-constrained and thermally demanding applications - especially where AEC-Q101 compliance and high ESD immunity are mandatory.
FAQ
What is the exact Zener voltage range for MMBZ5237BLT1H?
The MMBZ5237BLT1H has a guaranteed Zener voltage range of 7.79 V to 8.61 V at a test current of 20 mA, with a nominal value of 8.2 V. This ±3% tolerance is measured per the datasheet's defined conditions (TA = 25°C, pulse test), and the device maintains regulation within this band across its specified operating temperature range.
Is MMBZ5237BLT1H pin-compatible with other SOT-23 Zener diodes?
Yes, MMBZ5237BLT1H uses the standard SOT-23 pinout: Pin 1 = Anode, Pin 2 = No Connection, Pin 3 = Cathode. This matches industry-standard Zeners like BZX84-C8V2LT1G and MMBZ5237BLT1G, enabling direct PCB footprint reuse - provided the NC pin remains unconnected in layout.
Does MMBZ5237BLT1H meet automotive reliability standards?
Yes, MMBZ5237BLT1H is AEC-Q101 qualified and PPAP capable, confirming its suitability for automotive applications including body electronics and infotainment systems. It undergoes stress testing for temperature cycling, humidity, and mechanical shock per the AEC standard.
What is the maximum power dissipation of MMBZ5237BLT1H on a standard PCB?
MMBZ5237BLT1H delivers 225 mW maximum power dissipation on FR-5 board at 25°C ambient, derating linearly at 1.8 mW/°C above that temperature. On alumina substrate, it supports up to 300 mW at 25°C, making thermal design dependent on board material and copper area.
How does the ESD rating of MMBZ5237BLT1H impact system-level design?
With Class 3 Human Body Model ESD rating (>16 kV), MMBZ5237BLT1H provides intrinsic protection against handling and assembly discharges. This reduces or eliminates the need for external TVS diodes in low-energy signal paths, simplifying BOM and saving board space in portable and wearable designs.
MMBZ5237BLT1H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
MMBZ5237BLT1H FAQ
1.How can I place an order for MMBZ5237BLT1H through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5237BLT1H 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 MMBZ5237BLT1H reliable?
The price and inventory of MMBZ5237BLT1H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5237BLT1H is usually 5 days.
3.What payment methods are accepted for MMBZ5237BLT1H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5237BLT1H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5237BLT1H?
MMBZ5237BLT1H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5237BLT1H 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 MMBZ5237BLT1H?
For technical support, including MMBZ5237BLT1H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5237BLT1H requirements.
6.How does Aetrix verify that MMBZ5237BLT1H is sourced from the original manufacturer or authorized distributors?
All MMBZ5237BLT1H 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 MMBZ5237BLT1H meets industry standards.
7.What is the process for return or replacement of MMBZ5237BLT1H?
All MMBZ5237BLT1H units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5237BLT1H, 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 MMBZ5237BLT1H part is unused and in its original packaging.
Return procedure for MMBZ5237BLT1H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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