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onsemi MMBZ5237BLT3G
- Part No.:
- MMBZ5237BLT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5237BLT3G.pdf
- Description:
- DIODE ZENER 8.2V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,139
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Product details
Overview
MMBZ5237BLT3G 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 power rails and reference circuits for portable electronics.
For engineers reviewing the MMBZ5237BLT3G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, ESD robustness (Class 3, >16 kV HBM), and real-world use cases in battery-powered systems and high-density PCBs.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its Zener voltage is specified at IZT = 20 mA with ±5% tolerance (7.79–8.61 V), and exhibits a positive temperature coefficient near 8.2 V - typical for mid-voltage Zeners - enabling stable biasing across −65°C to +150°C junction range.
Thermal performance is defined for FR-5 board (RJA = 556°C/W) and alumina substrate (RJA = 417°C/W), with linear derating of 1.8 mW/°C above 25°C on FR-5. The NC pin (Pin 2) isolates internal die structure and must remain unconnected in layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.2 V nominal at 20 mA - sets precise clamping/reference level in low-power analog and digital supply rails |
| Power Dissipation (PD) | 225 mW on FR-5 board - defines maximum continuous DC or pulsed power handling without thermal runaway |
| Zener Impedance (ZZT) | 500 Ω max at 20 mA - determines regulation stiffness under load transients; lower values improve line/load regulation |
| Reverse Leakage (IR) | 3 μA max at 6.5 V - ensures minimal quiescent current draw in always-on monitoring or backup circuits |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct integration into handheld and consumer interfaces without external protection |
| Junction Temp Range | −65°C to +150°C - supports operation in automotive under-hood, industrial control, and outdoor embedded environments |
| Forward Voltage (VF) | 0.95 V max at 10 mA - allows bidirectional clamping when used with series resistor in signal line protection |
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 polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connects to lower-potential side of regulated node; forward-biased during normal conduction |
| 2 | No Connection | Internally isolated; must remain floating - no PCB trace or copper pour attached |
| 3 | Cathode | Connects to higher-potential side; Zener breakdown occurs between Pin 3 and Pin 1 when reverse biased |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW power rating on FR-5 | Enables compact voltage clamping in 0.75″ × 1.0″ PCB areas without heatsinking or airflow |
| ESD robustness >16 kV HBM | Eliminates need for discrete TVS in USB, button, or sensor interface lines on portable designs |
| Pb-free, halogen-free, RoHS-compliant | Meets IPC-J-STD-020 moisture sensitivity level 1 (MSL1) and global environmental compliance mandates |
| Optimized for automated placement | Standard SOT-23 footprint and marking allow direct integration into high-speed pick-and-place workflows |
Applications
| Portable Power Monitoring | USB Interface Clamping |
|---|---|
Use Scenario: Real-time battery voltage sensing in Bluetooth earbuds with 3.0–4.2 V Li-ion supply. IC Role / Device Role / Timing Role: Zener reference for ADC input scaling and low-battery threshold detection. Use Value: Stable 8.2 V reference enables accurate 12-bit ADC conversion across temperature without trimming. |
Use Scenario: Overvoltage protection on USB D+ and D− lines in OTG-enabled smartwatches. IC Role / Device Role / Timing Role: Bidirectional transient suppressor placed between data line and ground. Use Value: 0.95 V forward drop and 8.2 V reverse clamp limit signal swing within USB 2.0 spec while surviving ESD events. |
| Industrial Sensor Biasing | IoT Node Reference Stability |
Use Scenario: Providing excitation voltage to 350 Ω strain gauge bridge in wireless pressure transmitters. IC Role / Device Role / Timing Role: Low-drift voltage reference for Wheatstone bridge biasing and ratiometric measurement. Use Value: 500 Ω ZZT minimizes output impedance variation under bridge current changes, improving measurement repeatability. |
Use Scenario: Maintaining stable 3.3 V LDO feedback divider reference in LPWAN sensor nodes powered by coin cells. IC Role / Device Role / Timing Role: Precision shunt regulator supplying reference to feedback network of adjustable LDO. Use Value: 3 μA leakage at 6.5 V reduces standby current by >10× versus standard 1N4733A, extending 10-year battery life. |
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 30 Ω ZZT; SOT-23 package with identical pinout (Pin 1-Anode, Pin 2-NC, Pin 3-Cathode) | Higher power and lower impedance suit higher-current references (e.g., op-amp biasing), but requires tighter thermal layout | Select when regulation stiffness under >5 mA load or extended pulse duty cycles is required |
| MMBZ5237BS | Same electrical specs, but in SOD-123 package (3.7 mm × 1.6 mm); 350 mW rating on FR-4; no NC pin - dual-terminal construction | Larger footprint and higher power enable use in non-space-constrained industrial PCBs; incompatible with SOT-23 pick-and-place | Select when board area permits larger package and higher reliability under sustained 250 mW dissipation is needed |
Compared with BZX84-C8V2LT1G and MMBZ5237BS, the MMBZ5237BLT3G offers optimal balance of ultra-small size, Class 3 ESD robustness, and proven manufacturability in high-volume portable assemblies - making it preferred for density-critical, hand-held, and battery-sensitive designs.
Availability
MMBZ5237BLT3G is available at Aetrix Electronics and suitable for cellular phone power management, handheld medical diagnostics, and high-density PC boards requiring stable component supply and full RoHS compliance.
Supply support for MMBZ5237BLT3G 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 supplier of energy-efficient semiconductor solutions, specializing in automotive, industrial, cloud, and IoT applications with emphasis on reliability and sustainability.
The MMBZ52xxBLT3G series belongs to onsemi's precision Zener voltage regulator product line, engineered specifically for miniaturized, high-reliability voltage reference and overvoltage protection in portable and space-constrained electronic systems.
FAQ
What is the Zener voltage tolerance for MMBZ5237BLT3G?
The MMBZ5237BLT3G has a Zener voltage tolerance of ±5% around its nominal 8.2 V rating, meaning the actual VZ falls between 7.79 V and 8.61 V when measured at IZT = 20 mA and TA = 25°C. This tolerance is guaranteed per onsemi's Electrical Characteristics table and applies across the full operating temperature range.
Does MMBZ5237BLT3G have a functional third pin?
No, MMBZ5237BLT3G uses a three-terminal SOT-23 package but only two terminals are electrically active: Pin 1 (Anode) and Pin 3 (Cathode). Pin 2 is explicitly designated "No Connection" in the datasheet and must remain unconnected in both schematic and layout - it serves mechanical support and die isolation only.
Can MMBZ5237BLT3G be used for bidirectional ESD protection?
Yes, MMBZ5237BLT3G can provide bidirectional clamping: its forward voltage is ≤0.95 V at 10 mA, and reverse Zener voltage is 8.2 V. When placed between a signal line and ground with appropriate series resistance, it limits positive transients to ~0.95 V and negative transients to ~8.2 V - effective for low-speed digital I/O like I²C or GPIO where 8.2 V clamping is acceptable.
What is the thermal derating behavior of MMBZ5237BLT3G above 25°C?
MMBZ5237BLT3G derates linearly at 1.8 mW/°C above 25°C when mounted on FR-5 board. At 70°C ambient, its usable power drops to 225 mW − (45 × 1.8) = 144 mW. On alumina substrate, derating is 2.4 mW/°C, yielding 192 mW at 70°C - critical for sealed enclosures or high-temperature industrial deployments.
Is MMBZ5237BLT3G suitable for automotive applications?
MMBZ5237BLT3G itself is not AEC-Q101 qualified; however, the SZMMBZ5237BLT3G variant (same electrical specs, automotive-grade traceability and PPAP support) is certified. For non-safety-critical infotainment or body electronics where qualification isn't mandated, MMBZ5237BLT3G may be used - but design-in requires validation per system-level requirements.
MMBZ5237BLT3G 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:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
MMBZ5237BLT3G FAQ
1.How can I place an order for MMBZ5237BLT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5237BLT3G 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 MMBZ5237BLT3G reliable?
The price and inventory of MMBZ5237BLT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5237BLT3G is usually 5 days.
3.What payment methods are accepted for MMBZ5237BLT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5237BLT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5237BLT3G?
MMBZ5237BLT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5237BLT3G 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 MMBZ5237BLT3G?
For technical support, including MMBZ5237BLT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5237BLT3G requirements.
6.How does Aetrix verify that MMBZ5237BLT3G is sourced from the original manufacturer or authorized distributors?
All MMBZ5237BLT3G 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 MMBZ5237BLT3G meets industry standards.
7.What is the process for return or replacement of MMBZ5237BLT3G?
All MMBZ5237BLT3G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5237BLT3G, 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 MMBZ5237BLT3G part is unused and in its original packaging.
Return procedure for MMBZ5237BLT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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