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Diodes Incorporated MMBZ5237BQ-13-F
- Part No.:
- MMBZ5237BQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5237BQ-13-F.pdf
- Description:
- DIODE ZENER 8.2V 350MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,779
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Product details
Overview
MMBZ5237BQ-13-F from Diodes Incorporated is a 8.2 V, 350 mW surface-mount Zener diode in SOT23 package, rated for 20 mA test current with 8 Ω dynamic impedance at 1 kHz and 3.0 µA reverse leakage at 6.5 V, used for precision voltage regulation and overvoltage protection in low-power analog and digital supply rails.
For engineers reviewing the MMBZ5237BQ-13-F datasheet, MMBZ5237BQ-13-F pinout, MMBZ5237BQ-13-F application, or MMBZ5237BQ-13-F equivalent, key selection criteria include zener voltage tolerance (±5%), thermal resistance (357 °C/W), JEDEC-compliant reliability, and compatibility with automated SMT assembly on FR-4 PCBs.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its planar die construction ensures consistent breakdown characteristics and low parameter drift across production lots.
Designed for operation at 25°C ambient with derating above 25°C per Fig. 1, it delivers specified zener voltage (7.79–8.61 V) at 20 mA test current and exhibits 500 Ω maximum knee impedance at 0.25 mA, supporting accurate low-current biasing and sensing functions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.2 V nominal, 7.79–8.61 V range at IZT = 20 mA - defines regulated output voltage tolerance for reference and clamp circuits |
| Power Dissipation (PD) | 350 mW on FR-4 PCB - sets maximum continuous power handling without forced cooling or heatsinking |
| Zener Impedance (ZZT) | 8 Ω max at f = 1 kHz, IZT = 20 mA - determines regulation accuracy under dynamic load changes |
| Reverse Leakage (IR) | 3.0 µA max at VR = 6.5 V - ensures minimal standby current in voltage-sense or clamping paths |
| Thermal Resistance (RθJA) | 357 °C/W - quantifies junction-to-ambient temperature rise per watt, critical for thermal design on standard PCB layout |
| Operating Temperature | −65 °C to +150 °C - supports industrial and automotive under-hood applications without derating |
Pinout & Package
Package: SOT23 - 3-terminal plastic surface-mount package with matte tin-plated alloy 42 leadframe, UL 94V-0 rated molding compound, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground path | Connected to circuit ground or lower-potential node when used as shunt regulator or clamp |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Provides stable 8.2 V reference relative to anode; connects to supply rail or protected signal line |
| No-Connect (Pin 3) | Unused internal die pad | Electrically isolated; must remain unconnected per datasheet mechanical diagram and marking layout |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight VZ tolerance (±5%) and repeatable ZZT across manufacturing batches |
| 350 mW dissipation on FR-4 | Eliminates need for thermal vias or copper pour in space-constrained consumer and IoT PCBs |
| JEDEC-compliant high-reliability qualification | Validated for long-term stability in mission-critical industrial control and automotive subsystems |
| Lead-free, halogen- and antimony-free "Green" compound | Meets RoHS 3 (2015/863/EU) and automotive AEC-Q200 change-control requirements |
Applications
| Power Supply Regulation | Signal Line Clamping |
|---|---|
|
Use Scenario: Stabilizing 8.2 V reference for ADC biasing or op-amp feedback networks in battery-powered sensor nodes. IC Role / Device Role / Timing Role: Shunt voltage regulator providing precise DC reference independent of input ripple or load variation. Use Value: Maintains ±1% reference accuracy over −40 °C to +85 °C due to low tempco and 8 Ω ZZT. |
Use Scenario: Protecting GPIO pins of microcontrollers from ESD-induced overvoltage during hot-plug events. IC Role / Device Role / Timing Role: Fast-acting transient voltage clamp limiting excursion to ≤8.61 V before damage threshold. Use Value: Responds within nanoseconds to transients while drawing only 3.0 µA leakage at 6.5 V operating point. |
| Automotive Sensor Interface | Industrial Analog Front-End |
|
Use Scenario: Providing stable bias for Hall-effect position sensors in engine management modules exposed to wide ambient swings. IC Role / Device Role / Timing Role: Zener reference source enabling ratiometric measurement accuracy across −40 °C to +125 °C. Use Value: Qualified to JEDEC standards for high-reliability operation and compatible with IATF 16949 manufacturing. |
Use Scenario: Generating local 8.2 V rail for instrumentation amplifiers in programmable logic controller (PLC) analog input cards. IC Role / Device Role / Timing Role: Low-noise voltage reference with 500 Ω knee impedance ensuring stable quiescent current in precision gain stages. Use Value: Enables <0.5% full-scale error in 16-bit data acquisition systems via stable bias under variable load conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C8V2LT1G | Same 8.2 V nominal, but 225 mW PD, 15 Ω ZZT, and higher 10 µA IR at 6.5 V | Lower power handling limits use in >150 mW continuous regulation; higher ZZT reduces regulation fidelity | Select when board space allows larger thermal margin or cost is primary constraint over precision |
| MMBZ5237BS-13-F | Identical electrical specs but SOD-323 package (smaller footprint, 250 mW rating, 430 °C/W RθJA) | Reduced thermal mass increases junction temperature rise under same load; unsuitable for sustained 20 mA operation | Choose only for ultra-compact layouts where peak pulse regulation suffices and average power stays below 120 mW |
Compared with BZX84-C8V2LT1G and MMBZ5237BS-13-F, MMBZ5237BQ-13-F delivers superior thermal performance (357 °C/W), tighter impedance (8 Ω), and higher continuous power (350 mW), making it optimal for stable, long-duration voltage reference in industrial and automotive environments.
Availability
MMBZ5237BQ-13-F is available at Aetrix Electronics and suitable for power supply regulation, signal line clamping, and automotive sensor interface applications requiring stable component supply and JEDEC-qualified reliability.
Supply support for MMBZ5237BQ-13-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, specializing in high-reliability components for industrial, automotive, and computing markets.
This device belongs to the MMBZ52xxB series of 350 mW Zener diodes designed specifically for precision voltage reference and overvoltage protection in space-constrained, thermally demanding applications.
FAQ
What is the maximum continuous Zener current for MMBZ5237BQ-13-F at 25°C ambient?
The device is rated for 20 mA test current (IZT) and supports up to 42.8 mA continuous Zener current at 25°C ambient, calculated from PD = 350 mW and VZ = 8.2 V. Derating begins above 25°C per the power derating curve in Figure 1 of DS18011 Rev. 26-2.
Is MMBZ5237BQ-13-F qualified for automotive applications?
Yes - it is manufactured in IATF 16949 certified facilities and meets JEDEC high-reliability standards referenced in AEC-Q200. While not itself an AEC-Q200-qualified part number, its Q-suffix indicates automotive-grade traceability and change control; full qualification requires selecting the corresponding AEC-Q200 variant (e.g., MMBZ5237BQ-13-FQ).
How does the SOT23 package affect thermal performance compared to larger packages?
The SOT23 package delivers 357 °C/W junction-to-ambient thermal resistance on FR-4 PCBs with recommended pad layout. This is 20–30% higher than TO-236AB or SOD-123 equivalents, meaning junction temperature rises faster under identical power dissipation - requiring careful layout with thermal vias if operating near 350 mW continuously.
Can MMBZ5237BQ-13-F be used in series or parallel configurations?
Series connection is acceptable for higher voltage references, but parallel use is discouraged due to mismatched Zener voltages causing current hogging. The ±5% VZ tolerance (7.79–8.61 V) means even matched units may share current unevenly, risking thermal runaway - discrete current-limiting resistors per device are mandatory if paralleling is unavoidable.
MMBZ5237BQ-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 8.2 V
- Tolerance:
- ±5%
- Power - Max:
- 350 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 (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MMBZ5237BQ-13-F FAQ
1.How can I place an order for MMBZ5237BQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5237BQ-13-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 MMBZ5237BQ-13-F reliable?
The price and inventory of MMBZ5237BQ-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5237BQ-13-F is usually 5 days.
3.What payment methods are accepted for MMBZ5237BQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5237BQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5237BQ-13-F?
MMBZ5237BQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5237BQ-13-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 MMBZ5237BQ-13-F?
For technical support, including MMBZ5237BQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5237BQ-13-F requirements.
6.How does Aetrix verify that MMBZ5237BQ-13-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5237BQ-13-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 MMBZ5237BQ-13-F meets industry standards.
7.What is the process for return or replacement of MMBZ5237BQ-13-F?
All MMBZ5237BQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5237BQ-13-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 MMBZ5237BQ-13-F part is unused and in its original packaging.
Return procedure for MMBZ5237BQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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