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MMBZ5237B
Good-Ark Semiconductor
DIODE, ZENER, 0.50W, 8.2V, 5%, S
5841 Pcs New Original In Stock
Zener Diode 8.2 V 500 mW ±5% Surface Mount SOT-23
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5.0 / 5.0
- (401 Ratings)
MMBZ5237B
Product Overview
12787925
DiGi Electronics Part Number
MMBZ5237B-DGManufacturer
Good-Ark Semiconductor
MMBZ5237B
Description
DIODE, ZENER, 0.50W, 8.2V, 5%, SInventory
5841 Pcs New Original In Stock
Zener Diode 8.2 V 500 mW ±5% Surface Mount SOT-23
Quantity
Minimum 1
Minimum 1
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MMBZ5237B Technical Specifications
Category
Diodes, Zener, Single Zener Diodes
Packaging
Tape & Reel (TR)
Series
MMBZ52xxB
Product Status
Active
Voltage - Zener (Nom) (Vz)
8.2 V
Tolerance
±5%
Power - Max
500 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
-
Mounting Type
Surface Mount
Package / Case
TO-236-3, SC-59, SOT-23-3
Supplier Device Package
SOT-23
Datasheet & Documents
HTML Datasheet
MMBZ5237B-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8541.10.0050
Additional Information
Other Names
4786-MMBZ5237BTR
4786-MMBZ5237BCT
4786-MMBZ5237BDKR
Standard Package
3,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
грудня 02, 2025
Their packaging is thorough, ensuring no damage occurs during transit.
грудня 02, 2025
I received my order well-packed and in pristine condition, even after a long transit.
грудня 02, 2025
Received my order in no time, and the quality is simply outstanding.
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Frequently Asked Questions (FAQ)
Can the MMBZ5237B be used for voltage regulation in a low-power portable design with tight thermal constraints, and what are the risks of thermal runaway under continuous load?
Yes, the MMBZ5237B can regulate at 8.2V in low-power portable applications, but thermal management is critical due to its 500 mW SOT-23 package limit. In high-ambient environments or with continuous current above 40–50 mA, poor PCB copper layout can cause localized heating, increasing Zener current and risking thermal runaway. To mitigate, use at least 25 mm² of copper pour for thermal dissipation, limit average power to 300 mW, and consider derating voltage regulation accuracy above 85°C. Monitor actual board temperature during burn-in testing to ensure stability.
How does the dynamic impedance (Zzt) of the MMBZ5237B affect noise performance in a sensitive analog reference circuit compared to the BZT52C8V2?
The MMBZ5237B has a maximum dynamic impedance of 8 Ω, which is comparable to the BZT52C8V2 but higher than precision references like the LT1027. In low-noise analog circuits, this Zzt can amplify ripple and high-frequency noise, especially when fed from a high-impedance source. To minimize impact, always pair the MMBZ5237B with a bypass capacitor (e.g., 1 µF ceramic + 0.1 µF in parallel) at the output and buffer with a low-Ib op-amp. For ultra-low-noise designs, consider replacing MMBZ5237B with a shunt reference like the LM385-8.2, which offers better regulation and lower dynamic impedance.
Is the MMBZ5237B a reliable drop-in replacement for the ON Semiconductor MMBZ5237BLT1G in automotive applications with voltage transients and wide temperature swings?
Yes, the MMBZ5237B from Good-Ark Semiconductor is a functional equivalent to the MMBZ5237BLT1G, sharing the same 8.2V ±5%, 500 mW SOT-23 footprint and electrical specs. However, validate automotive reliability by confirming long-term stability under thermal cycling (-40°C to +125°C) and load-dump transients. Good-Ark’s MSL-1 rating supports robust reflow soldering, but batch-to-batch consistency may vary vs. ON Semiconductor. Use statistical process controls in production and include TVS clamping if exposed to ISO 7637-2 transients to avoid Zener degradation over time.
What are the risks of using the MMBZ5237B for reverse polarity protection instead of its intended voltage regulation role?
Using the MMBZ5237B for reverse polarity protection is risky because its 900 mV forward drop at 10 mA suggests limited current-handling capability in forward conduction. During a reverse event, the diode briefly conducts, and if current exceeds 50–100 mA even momentarily, the SOT-23 package may overheat due to insufficient heat dissipation. This can lead to parametric shifts or short failure. Instead, use a dedicated series Schottky like the RB520S-40T1G for reverse blocking, or pair the MMBZ5237B with a series diode for safe biasing—do not rely on it as the primary protection device.
How does leakage current in the MMBZ5237B impact battery-powered circuits at elevated temperatures, and how can it be minimized?
The MMBZ5237B has a typical leakage of 3 µA at 6.5V at 25°C, but this can increase exponentially with temperature—exceeding 50 µA at 100°C in some cases. In battery-powered designs, especially with high-impedance nodes, this leakage contributes to unnecessary drain and false triggering in sensing circuits. To minimize risk, avoid using the MMBZ5237B in always-on partial-bias configurations; instead, gate it with a MOSFET switch or use lower-leakage Zeners like the NZ9B8V2T5G. Always test leakage at maximum operating temperature across multiple units to ensure design margin.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
MMBZ5237B CAD Models
Good-Ark Semiconductor MMBZ5237B PCB symbols & footprints
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