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Diodes Incorporated MMBZ5237BW-7
- Part No.:
- MMBZ5237BW-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
MMBZ5237BW-7.pdf
- Description:
- DIODE ZENER 8.2V 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:1,574
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Product details
Overview
MMBZ5237BW-7 from Diodes Incorporated is a 200mW surface-mount Zener diode with nominal zener voltage 8.2V (±5%), 20mA test current, 8Ω maximum zener impedance at 20mA, and 3μA maximum reverse leakage at 6.5V. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning and power rail regulation circuits.
For engineers reviewing the MMBZ5237BW-7 datasheet, MMBZ5237BW-7 pinout, MMBZ5237BW-7 application, or MMBZ5237BW-7 equivalent, key selection criteria include zener tolerance, dynamic impedance at operating current, thermal derating behavior on FR4, and SOT323 package compatibility with high-density PCB layouts.
Technical Context
This device operates in reverse breakdown mode with tightly controlled VZ (7.79–8.61V) under 20mA test current, enabling stable voltage regulation in space-constrained consumer and industrial control circuits. Its 625°C/W junction-to-ambient thermal resistance requires derating above +25°C ambient per Figure 1.
The SOT323 package features matte tin-plated Alloy 42 leads, RoHS-compliant green molding compound (UL 94V-0), and moisture sensitivity level 1 - supporting reflow-compatible automated assembly without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 8.2V nominal, ±5% tolerance (7.79–8.61V); ensures predictable clamping threshold in 8V rail protection |
| Power Dissipation | 200mW at +25°C; limits continuous current to ~24mA at 8.2V before thermal shutdown |
| Zener Impedance | 8Ω max at IZT = 20mA; maintains <0.16V output variation across ±5mA load swings |
| Reverse Leakage | 3μA max at VR = 6.5V; prevents >2.6μW standby power loss in battery-backed circuits |
| Thermal Resistance | 625°C/W junction-to-ambient; requires ≥50% power derating at +85°C ambient |
| Package | SOT323; 2.1mm × 1.3mm footprint with 0.65mm pitch - fits 0.5mm trace/space designs |
Pinout & Package
Package: SOT323 - three-terminal plastic surface-mount case with cathode-marked top-side marking (KF2), 0.006g mass, UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node during normal operation; carries reverse leakage current when clamping |
| Cathode | Zener breakdown terminal | Marked side of package; connected to higher-potential rail for voltage reference or overvoltage clamp function |
| Case / Heat Sink | Non-electrical thermal path | No internal connection; relies on PCB copper pour for heat dissipation per AP02001 pad layout |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability - supports under-hood sensor modules and infotainment power rails |
| Lead-free & halogen-free | Meets EU RoHS 2 and JEDEC J-STD-020D Level 1 - eliminates post-solder cleaning and enables direct Pb-free reflow |
| Low dynamic impedance | 8Ω typical at 20mA - delivers tighter regulation than 1N4736A (10Ω) in feedback loops |
| Stable VZ over temperature | TC of ~0.05%/°C - drifts <±0.4V from −40°C to +125°C in unregulated environments |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Clamp |
|---|---|
Use Scenario: Protecting 8-bit ADC input stages from ESD-induced transients in factory-floor pressure sensors. IC Role / Device Role / Timing Role: Zener clamp limiting input voltage to 8.2V ±5%, placed between RC filter and op-amp buffer. Use Value: Prevents ADC saturation while maintaining <0.5LSB error due to 8Ω zener impedance matching filter impedance. | Use Scenario: Clamping CC line voltage during USB-C port hot-plug events to avoid VBUS coupling into controller logic. IC Role / Device Role / Timing Role: Standby-mode shunt regulator holding CC line at 8.2V until PD negotiation begins. Use Value: 3μA leakage ensures <100nA standby current draw - meets USB-C specification for sink-only devices. |
| Automotive Cabin Temperature Monitor | IoT Node Battery Voltage Supervisor |
Use Scenario: Providing stable 8.2V reference for thermistor bridge excitation in HVAC control modules. IC Role / Device Role / Timing Role: Precision voltage source for ratiometric measurement, operating continuously at 15°C–85°C ambient. Use Value: AEC-Q101 qualification and <±0.4V total drift ensure calibration stability over 10-year vehicle life. | Use Scenario: Monitoring Li-ion cell voltage decay in BLE-enabled asset trackers using comparator hysteresis. IC Role / Device Role / Timing Role: Threshold detector triggering wake-up when cell drops below 8.2V (≈20% SoH). Use Value: 200mW rating allows direct connection to 3.3V LDO output without series resistor - simplifies BOM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C8V2 | Same 8.2V nominal, but 350mW rating and SOT23 package; 15Ω zener impedance at 5mA | Higher power handling suits 50mA transient suppression; larger footprint limits high-density layouts | Select for higher surge immunity where board area permits |
| MMBZ5237BS | Identical electrical specs but SOD-323 package (1.7×1.3mm vs SOT323's 2.1×1.3mm); same 200mW rating | 0.4mm shorter length eases routing in ultra-thin wearables; identical thermal performance | Select for space-constrained wearable PCBs requiring identical regulation behavior |
Compared with BZX84-C8V2 and MMBZ5237BS, MMBZ5237BW-7 offers optimal balance of low-profile SOT323 packaging, AEC-Q101 qualification, and 8Ω impedance - making it preferred for automotive and portable industrial sensors where size and reliability are co-constrained.
Availability
MMBZ5237BW-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C power delivery clamp circuits, automotive cabin temperature monitors, and IoT node battery voltage supervisors requiring stable component supply and long-term lifecycle support.
Supply support for MMBZ5237BW-7 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the U.S.
The MMBZ52xxBW series belongs to Diodes' precision Zener diode product line, engineered specifically for compact, high-reliability voltage reference and overvoltage protection in automotive, industrial, and portable electronics.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The MMBZ5237BW-7 has a nominal zener voltage of 8.2V with a guaranteed range of 7.79V to 8.61V at 20mA test current. Below 6.5V reverse bias, leakage remains ≤3μA - meaning it reliably blocks up to 6.5V without significant conduction. Breakdown onset occurs gradually starting near 7.5V, reaching full regulation at 20mA within the specified VZ band.
Can this Zener diode be used in parallel for higher power dissipation?
No - MMBZ5237BW-7 must not be paralleled due to inherent VZ tolerance (±5%) and positive temperature coefficient. Even matched units will share current unevenly, causing thermal runaway in one device. For >200mW needs, use a single higher-rated Zener (e.g., 1N4736A) or active regulation with a transistor-based shunt.
Is the SOT323 package compatible with standard reflow profiles for lead-free soldering?
Yes - the SOT323 package uses matte tin-plated Alloy 42 leads qualified per J-STD-020D Level 1 moisture sensitivity, allowing direct placement into IPC/JEDEC J-STD-020-compliant lead-free reflow profiles (peak 260°C, 60-second duration) without baking or special handling.
How does its zener impedance affect accuracy in a voltage reference circuit?
With 8Ω maximum zener impedance at 20mA, a ±2mA load variation causes only ±16mV output shift - less than 0.2% of 8.2V. This enables sub-0.5% reference accuracy in buffered configurations. However, unbuffered use with >1mA source/sink currents requires impedance-matched external resistors to minimize regulation error.
MMBZ5237BW-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MMBZ5237BW-7 FAQ
1.How can I place an order for MMBZ5237BW-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5237BW-7 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 MMBZ5237BW-7 reliable?
The price and inventory of MMBZ5237BW-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5237BW-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5237BW-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5237BW-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5237BW-7?
MMBZ5237BW-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5237BW-7 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 MMBZ5237BW-7?
For technical support, including MMBZ5237BW-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5237BW-7 requirements.
6.How does Aetrix verify that MMBZ5237BW-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5237BW-7 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 MMBZ5237BW-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5237BW-7?
All MMBZ5237BW-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5237BW-7, 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 MMBZ5237BW-7 part is unused and in its original packaging.
Return procedure for MMBZ5237BW-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5237BW-7 Tags
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