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Diodes Incorporated MMBZ5237BW-7-F
- Part No.:
- MMBZ5237BW-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
MMBZ5237BW-7-F.pdf
- Description:
- DIODE ZENER 8.2V 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:5,950
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Product details
Overview
MMBZ5237BW-7-F from Diodes Incorporated is a 8.2 V, 200 mW surface-mount Zener diode in SOT323 package, designed for precision voltage regulation and overvoltage protection in low-power analog and digital circuits. It delivers ±5% Zener voltage tolerance (7.79–8.61 V), 8 Ω dynamic impedance at 20 mA test current, and maximum 3 µA reverse leakage at 6.5 V, commonly used in power supply reference rails and I/O clamp circuits.
For engineers reviewing the MMBZ5237BW-7-F datasheet, MMBZ5237BW-7-F pinout, MMBZ5237BW-7-F application, or MMBZ5237BW-7-F equivalent, key selection criteria include nominal Zener voltage, power dissipation derating behavior, thermal resistance (625 °C/W), junction-to-ambient thermal performance, and AEC-Q101 qualification status for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its 200 mW power rating and 625 °C/W thermal resistance define its safe operating area on FR4 PCBs with recommended pad layout per AP02001.
The device exhibits 8 Ω Zener impedance at 20 mA test current and 500 Ω at knee current (0.25 mA), enabling predictable clamping response across low- to mid-current ranges. Reverse leakage remains ≤3 µA up to 6.5 V, supporting low-quiescent-current biasing in sensor interfaces and ADC reference buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 8.2 V - precise DC reference point for voltage regulation or clamping |
| Zener Voltage Range | 7.79 V to 8.61 V - ±5% tolerance ensures design margin for worst-case regulation |
| Power Dissipation | 200 mW - limits continuous current to ~24 mA at 8.2 V in ambient conditions |
| Zener Impedance | 8 Ω @ 20 mA - low dynamic resistance maintains stable output under load transients |
| Reverse Leakage | ≤3 µA @ 6.5 V - negligible current draw preserves battery life in always-on circuits |
| Thermal Resistance | 625 °C/W - defines temperature rise per watt; requires thermal-aware PCB layout |
| Operating Temp | −65 °C to +150 °C - supports under-hood automotive and industrial environments |
Pinout & Package
Package: SOT323 - ultra-small 3-pin surface-mount plastic package (2.10 mm × 1.30 mm × 0.90 mm), lead-free, halogen-free, and AEC-Q101 qualified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower potential node during normal operation; enables reverse-bias configuration for Zener action |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to higher potential node; voltage referenced to this pin during regulation/clamping |
| NC / Heat Sink (Pin 3) | Non-connected / thermal relief | No internal connection; may be tied to ground plane for minor thermal improvement but not electrically functional |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and body electronics |
| Green Molding Compound | UL 94V-0 rated, <900 ppm Br/Cl, <1000 ppm Sb - meets global environmental compliance mandates |
| SOT323 Package | 0.006 g weight and 2.1 mm × 1.3 mm footprint - enables high-density PCB layouts |
| Moisture Sensitivity Level 1 | No floor-life limitation before reflow - eliminates baking requirements in SMT assembly |
Applications
| Automotive Sensor Biasing | Industrial I/O Protection |
|---|---|
Use Scenario: Providing stable 8.2 V bias to analog pressure or temperature sensors in engine control units. IC Role / Device Role / Timing Role: Precision voltage reference source ensuring consistent sensor excitation and ADC input scaling. Use Value: Maintains sensor accuracy across −40 °C to +125 °C ambient while drawing <3 µA standby current. | Use Scenario: Clamping 24 V fieldbus inputs against ESD and surge events in PLC analog input modules. IC Role / Device Role / Timing Role: Low-capacitance (≈5 pF) shunt protector limiting transient voltage to ≤8.61 V. Use Value: Prevents damage to downstream op-amps without distorting signal integrity at 10 kHz bandwidth. |
| Low-Power MCU Reference | USB Port Overvoltage Clamp |
Use Scenario: Generating clean 8.2 V reference for internal ADC or DAC in battery-powered IoT edge nodes. IC Role / Device Role / Timing Role: Stable Zener reference replacing larger, less efficient LDOs in space-constrained designs. Use Value: Enables 200 mW power budget allocation while maintaining ±5% regulation over full temperature range. | Use Scenario: Protecting USB 2.0 data lines (D+/D−) from 8 kV contact ESD per IEC 61000-4-2. IC Role / Device Role / Timing Role: Fast-response shunt clamp with sub-nanosecond turn-on to suppress transients before IC damage. Use Value: Limits clamped voltage to ≤8.61 V with <8 Ω dynamic impedance, preserving signal eye diagram integrity. |
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, 350 mW rating, SOT23 package, 15 Ω Zz @ 5 mA | Higher power handling but larger footprint and higher Zz at low currents | Select when board space allows SOT23 and >200 mW dissipation is needed |
| MMSZ5237ET1G | Same 8.2 V nominal, 500 mW rating, SOD-123 package, 10 Ω Zz @ 20 mA | Larger package, higher thermal mass, not AEC-Q101 qualified | Choose for cost-sensitive industrial use where automotive qualification is unnecessary |
Compared with BZX84-C8V2LT1G and MMSZ5237ET1G, MMBZ5237BW-7-F offers superior thermal performance per unit area (SOT323), AEC-Q101 qualification, and tighter Zz at 20 mA - making it optimal for space-constrained, high-reliability automotive and portable electronics.
Availability
MMBZ5237BW-7-F is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial I/O protection, and low-power MCU reference circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MMBZ5237BW-7-F 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, manufacturing, and sales operations across Asia, Europe, and North America.
The MMBZ52xxBW series belongs to Diodes' AEC-Q101-qualified Zener diode portfolio, engineered specifically for voltage reference and transient suppression in automotive and industrial control systems where reliability and environmental compliance are critical.
FAQ
What is the maximum reverse voltage that can be continuously applied without breakdown?
The MMBZ5237BW-7-F has a nominal Zener voltage of 8.2 V with a guaranteed range of 7.79 V to 8.61 V. Continuous reverse voltage below 6.5 V results in ≤3 µA leakage; above this threshold, controlled breakdown begins. Full regulation occurs only at or above the specified Zener voltage range under defined test current.
Is this part suitable for use in automotive applications?
Yes - MMBZ5237BW-7-F is explicitly qualified to AEC-Q101 standards and manufactured using green, halogen-free molding compound. It operates across −65 °C to +150 °C and is widely deployed in engine control units, body electronics, and ADAS sensor interfaces where reliability and environmental compliance are mandatory.
How does the SOT323 package affect thermal performance compared to SOT23?
The SOT323 package has higher thermal resistance (625 °C/W vs. ~300–400 °C/W for typical SOT23) due to smaller pad area and reduced copper exposure. This requires careful PCB layout with thermal vias and copper pours to manage 200 mW dissipation, especially above 70 °C ambient.
Can this Zener diode replace a 3.3 V or 5 V reference in microcontroller circuits?
No - MMBZ5237BW-7-F is an 8.2 V Zener and cannot directly replace lower-voltage references. For 3.3 V or 5 V regulation, select MMBZ5227BW (3.6 V) or MMBZ5233BW (6.0 V) from the same series, ensuring matching power rating, package, and qualification level for system compatibility.
MMBZ5237BW-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 8.2 V
- Tolerance:
- ±5%
- Power - Max:
- 200 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-323
MMBZ5237BW-7-F FAQ
1.How can I place an order for MMBZ5237BW-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5237BW-7-F 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-F reliable?
The price and inventory of MMBZ5237BW-7-F 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-F is usually 5 days.
3.What payment methods are accepted for MMBZ5237BW-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5237BW-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5237BW-7-F?
MMBZ5237BW-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5237BW-7-F 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-F?
For technical support, including MMBZ5237BW-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5237BW-7-F requirements.
6.How does Aetrix verify that MMBZ5237BW-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5237BW-7-F 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-F meets industry standards.
7.What is the process for return or replacement of MMBZ5237BW-7-F?
All MMBZ5237BW-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5237BW-7-F, 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-F part is unused and in its original packaging.
Return procedure for MMBZ5237BW-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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