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Diodes Incorporated MMBZ5237BQ-7-F
- Part No.:
- MMBZ5237BQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5237BQ-7-F.pdf
- Description:
- DIODE ZENER 8.2V 350MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,900
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Product details
Overview
MMBZ5237BQ-7-F from Diodes Incorporated is a 8.2V ±5% tolerance, 350mW surface-mount Zener diode in SOT23 package, designed for precision voltage regulation and overvoltage protection in low-power analog and digital circuits. It delivers 8.2V nominal Zener voltage at 20mA test current, with 500Ω maximum Zener impedance at 1kHz and ≤3.0µA reverse leakage at 6.5V.
For engineers reviewing the MMBZ5237BQ-7-F datasheet, MMBZ5237BQ-7-F pinout, MMBZ5237BQ-7-F application, or MMBZ5237BQ-7-F equivalent, key selection criteria include Zener voltage accuracy, thermal derating behavior on FR-4 PCB, low leakage at sub-breakdown bias, and compatibility with automated SMT assembly under J-STD-020 Level 1 moisture sensitivity.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage across load variations and supply fluctuations. Its planar die construction ensures consistent VZ tolerance (±5%) and low dynamic impedance (500Ω max at IZT = 20mA), critical for noise-sensitive analog references.
Thermal performance is defined for mounting on FR-4 PCB with recommended pad layout: RθJA = 357°C/W and power derating begins linearly above +25°C ambient, reaching zero dissipation at +150°C. It is fully RoHS-compliant, halogen- and antimony-free, and qualified to JEDEC high-reliability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 8.2V at 20mA - provides stable voltage reference for biasing, clamping, or regulation in 5–12V systems |
| Zener Voltage Tolerance | ±5% (7.79–8.61V) - ensures predictable clamping threshold across production lots |
| Maximum Zener Impedance | 500Ω at 1kHz - limits AC ripple transmission in reference paths |
| Reverse Leakage Current | ≤3.0µA at VR = 6.5V - minimizes standby power loss in battery-backed circuits |
| Power Dissipation | 350mW on FR-4 PCB - defines maximum continuous DC/average power handling under standard layout |
| Operating Temperature | −65°C to +150°C - supports industrial and automotive under-hood environments |
| Moisture Sensitivity | Level 1 per J-STD-020 - enables unlimited floor life and reflow without baking |
Pinout & Package
Package: SOT23 - 3-terminal surface-mount plastic package with matte tin-plated alloy 42 leadframe; 0.008g weight; UL 94V-0 rated molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground | Connected to system ground or lower-potential node when used as shunt regulator |
| Cathode (Pin 2) | Zener breakdown terminal / voltage reference output | Provides regulated 8.2V relative to anode; connects to input via series resistor |
| NC / Dummy (Pin 3) | Non-connected internal tie | Internally unconnected; electrically isolated and not used in circuit design |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight VZ tolerance (±5%) and repeatable Zener impedance across temperature |
| 350mW dissipation on FR-4 | Validated thermal performance using industry-standard PCB layout-no heatsink required |
| JEDEC high-reliability qualification | Meets AEC-Q stress test baselines for long-term stability in automotive and industrial use |
| Lead-free & "Green" compliance | Halogen-free (<900ppm Br+Cl), antimony-free (<1000ppm), RoHS 3 compliant |
| SOT23 tape-and-reel packaging | 3,000 units per reel (Q-7-F suffix) - optimized for high-speed pick-and-place placement |
Applications
| USB Port ESD Protection | Microcontroller Reset Circuit |
|---|---|
|
Use Scenario: Clamps transient voltages on USB D+/D− lines during ESD events per IEC 61000-4-2. IC Role / Device Role: Shunt-type transient voltage suppressor placed between signal line and ground. Use Value: 8.2V breakdown ensures safe clamping below USB 2.0 data-line absolute maximum rating (−0.5V to 3.6V), while 3.0µA leakage avoids signal integrity degradation. |
Use Scenario: Generates clean reset signal for ARM Cortex-M microcontrollers during power-up and brownout. IC Role / Device Role: Precision voltage reference feeding RC delay network into reset IC input. Use Value: ±5% VZ tolerance guarantees reset assertion within 2.7–3.6V window; low 500Ω ZZT stabilizes reference against load variation. |
| Industrial Sensor Signal Conditioning | Low-Power IoT Node Voltage Reference |
|
Use Scenario: Provides stable bias voltage for op-amp-based bridge sensor amplifiers in 24V field transmitters. IC Role / Device Role: Zener shunt regulator supplying excitation and reference for instrumentation amplifier. Use Value: −65°C to +150°C operating range supports extended industrial temperature operation; 350mW rating allows direct regulation from 24V rail with 2.2kΩ series resistor. |
Use Scenario: Supplies accurate 8.2V reference to ADC reference input in battery-powered environmental sensors. IC Role / Device Role: Low-leakage voltage reference enabling ultra-low-power sleep-mode operation. Use Value: ≤3.0µA reverse leakage at 6.5V minimizes quiescent current draw, extending coin-cell battery life beyond 5 years in periodic wake-up applications. |
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-C8V2 | Same 8.2V nominal, but ±6% tolerance (7.69–8.71V); 500mW rating on FR-4; higher 10µA leakage at 6.5V | Less precise regulation; higher leakage reduces battery life in low-power designs | Select only if cost sensitivity outweighs voltage accuracy and leakage requirements |
| MMBZ5237BS-7-F | Identical electrical specs, but in SOT-323 package (smaller footprint, higher RθJA = 430°C/W) | Higher thermal resistance limits power handling on same PCB; requires tighter layout control | Choose only when board space is constrained and thermal margin is verified |
Compared with BZX84-C8V2 and MMBZ5237BS-7-F, MMBZ5237BQ-7-F offers superior voltage tolerance (±5% vs ±6%), lower leakage (≤3.0µA vs 10µA), and better thermal performance (357°C/W vs 430°C/W), making it optimal for precision regulation and long-life battery applications.
Availability
MMBZ5237BQ-7-F is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset generation, industrial sensor biasing, and low-power IoT voltage referencing requiring stable component supply and full traceability.
Supply support for MMBZ5237BQ-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.
This device belongs to the MMBZ52xxB series of 350mW Zener diodes, engineered specifically for high-volume, high-reliability surface-mount applications where precision voltage reference, low leakage, and automated assembly compatibility are essential.
FAQ
What is the maximum steady-state power dissipation for MMBZ5237BQ-7-F on a standard FR-4 PCB?
The device is rated for 350mW continuous power dissipation when mounted on FR-4 with Diodes Incorporated's recommended pad layout (documented in package outline DS18011). Derating begins linearly above +25°C ambient, reaching zero at +150°C. Exceeding this limit without thermal relief risks parametric shift or failure.
Is MMBZ5237BQ-7-F suitable for automotive applications?
MMBZ5237BQ-7-F is not AEC-Q200 qualified. For automotive use, Diodes recommends the Q-suffix automotive-grade variant (e.g., MMBZ5237BQ-7-F meets JEDEC high-reliability standards but lacks PPAP documentation, IATF 16949 traceability, and AEC-Q200 stress testing).
How does the SOT23 pinout differ between MMBZ5237BQ-7-F and standard dual-diode configurations?
MMBZ5237BQ-7-F uses a single-Zener SOT23 configuration: Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = NC (non-connected). It is not a dual-diode device-Pin 3 has no internal connection and must remain unconnected in layout.
Can MMBZ5237BQ-7-F be used in place of a 5.1V Zener for overvoltage protection?
No. With a nominal Zener voltage of 8.2V (7.79–8.61V range), it is unsuitable as a direct replacement for a 5.1V Zener (e.g., MMBZ5231B). Substituting would raise clamping voltage by >3V, risking damage to downstream 5V-tolerant components during overvoltage events.
MMBZ5237BQ-7-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-7-F FAQ
1.How can I place an order for MMBZ5237BQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5237BQ-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 MMBZ5237BQ-7-F reliable?
The price and inventory of MMBZ5237BQ-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 MMBZ5237BQ-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5237BQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5237BQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5237BQ-7-F?
MMBZ5237BQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5237BQ-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 MMBZ5237BQ-7-F?
For technical support, including MMBZ5237BQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5237BQ-7-F requirements.
6.How does Aetrix verify that MMBZ5237BQ-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5237BQ-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 MMBZ5237BQ-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5237BQ-7-F?
All MMBZ5237BQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5237BQ-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 MMBZ5237BQ-7-F part is unused and in its original packaging.
Return procedure for MMBZ5237BQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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