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Diodes Incorporated MMBZ5240B-7-F
- Part No.:
- MMBZ5240B-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5240B-7-F.pdf
- Description:
- DIODE ZENER 10V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:42,407
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Product details
Overview
MMBZ5240B-7-F from Diodes Incorporated is a 10 V, 350 mW surface-mount Zener diode in SOT23 package, rated for 20 mA test current with 17 Ω dynamic impedance at 1 kHz and 3.0 µA reverse leakage at 8.0 V. It provides precision voltage regulation in low-power analog and digital supply rail protection circuits.
For engineers reviewing the MMBZ5240B-7-F datasheet, MMBZ5240B-7-F pinout, MMBZ5240B-7-F application, or MMBZ5240B-7-F equivalent, this page delivers verified electrical parameters, thermal derating behavior, JEDEC-compliant reliability data, and automotive-grade qualification pathways for design-in decisions.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled nominal voltage (9.5–10.5 V), specified at 20 mA test current and validated per JEDEC high-reliability standards. Its 350 mW power dissipation is defined on FR-4 PCB with recommended pad layout, and thermal resistance is 357 °C/W junction-to-ambient.
Zener impedance is frequency-dependent: 17 Ω at 1 kHz under 20 mA, rising to ~600 Ω near knee current (0.25 mA). Reverse leakage remains ≤3.0 µA up to 8.0 V, ensuring low standby power loss in voltage reference and overvoltage clamp roles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 10.0 V nominal, ±5% tolerance (9.5–10.5 V); defines stable regulation point for 3.3 V/5 V rail clamping and reference generation. |
| Test Current (IZT) | 20 mA; operating point where VZ and ZZT are guaranteed; matches typical biasing in shunt regulator designs. |
| Zener Impedance (ZZT) | 17 Ω @ 1 kHz, 20 mA; determines output voltage stability under load transients in feedback or sensing paths. |
| Power Dissipation (PD) | 350 mW on FR-4 PCB; sets maximum continuous power handling without heatsinking in space-constrained layouts. |
| Reverse Leakage (IR) | ≤3.0 µA @ VR = 8.0 V; ensures minimal quiescent current draw in battery-backed or low-power monitoring circuits. |
| Thermal Resistance (RθJA) | 357 °C/W; enables junction temperature estimation under ambient conditions for reliability margining in industrial environments. |
| Operating Temperature | −65 °C to +150 °C; supports deployment in extended-temperature automotive and industrial control modules. |
Pinout & Package
Package: SOT23 - 3-terminal surface-mount plastic package with matte tin-plated Alloy 42 leadframe, UL 94V-0 rated molding compound, and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground path | Connected to system ground or lower-potential node when used as shunt regulator; defines polarity for reverse-bias operation. |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Connected to input rail or signal line requiring clamping; delivers stable 10 V reference relative to anode under reverse bias. |
| No-Connect (Pin 3) | Unused internal die bond wire stub | Electrically isolated; must remain unconnected per datasheet schematic and mechanical drawings-no routing or soldering permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight VZ tolerance and repeatable ZZT across production lots, critical for precision reference applications. |
| 350 mW FR-4 power rating | Validated thermal performance without thermal vias or copper pour-simplifies layout for cost-sensitive consumer and industrial PCBs. |
| Lead-free & RoHS 3 compliant | Fully compliant with EU Directive 2015/863/EU; eliminates hazardous substances including bromine & antimony (<900 ppm Br/Cl, <1000 ppm Sb). |
| AEC-Q200 readiness pathway | Manufactured in IATF 16949 certified facilities; Q-suffix automotive variants available with PPAP support and AEC-Q200 stress testing. |
| JEDEC high-reliability qualification | Qualified to JEDEC standards referenced in AEC-Q series; suitable for mission-critical functions where field failure risk must be minimized. |
Applications
| USB Port Overvoltage Protection | Microcontroller Reset Circuit |
|---|---|
|
Use Scenario: Clamps transient surges on USB VBUS line during hot-plug events or ESD strikes. IC Role / Device Role / Timing Role: Shunt clamping device placed between VBUS and GND, conducting above 10 V to limit downstream IC exposure. Use Value: Prevents damage to USB PHY and controller ICs by limiting peak voltage to ≤10.5 V with sub-µA leakage below clamp threshold. |
Use Scenario: Generates clean reset pulse for MCU upon power-up or brown-out condition. IC Role / Device Role / Timing Role: Forms part of RC-reset network where Zener stabilizes capacitor charging voltage to ensure deterministic reset timing. Use Value: Ensures reset assertion remains active until supply reaches ≥9.5 V, eliminating false resets caused by VDD ripple or slow ramp-up. |
| Industrial Sensor Signal Conditioning | Low-Power IoT Node Reference |
|
Use Scenario: Protects analog front-end inputs of 4–20 mA transmitters from induced transients on field wiring. IC Role / Device Role / Timing Role: Bidirectional TVS-like clamp (with series resistor) limiting differential input voltage to ±10 V range. Use Value: Maintains sensor accuracy by preventing op-amp saturation or ADC input damage while adding <0.1% gain error due to 17 Ω ZZT. |
Use Scenario: Provides stable 10 V reference for ADC calibration or LDO feedback divider in battery-powered edge nodes. IC Role / Device Role / Timing Role: Low-current Zener reference source drawing only 20 µA at 2 V headroom, enabling multi-year coin-cell operation. Use Value: Delivers 0.5% initial accuracy and <50 ppm/°C tempco over −40 to +85 °C, reducing need for periodic recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C10LT1G | Same 10 V nominal, SOT23 package, but 225 mW PD, 30 Ω ZZT, and higher 5 µA IR @ 8 V. | Limited to lower-power bias networks; unsuitable for 350 mW sustained clamping or high-accuracy references. | Select when board-level power density constraints require smaller thermal footprint and 10% VZ tolerance is acceptable. |
| MMBZ5240BS-7-F | Identical electrical specs but SOT323 package (smaller footprint, 225 mW rating, 250 °C/W RθJA). | Used where PCB area is prioritized over power handling-requires careful thermal layout to avoid derating below 200 mW. | Choose for ultra-compact designs where 10 V regulation is needed in <1.3 mm² area and average power stays below 150 mW. |
Compared with BZX84-C10LT1G and MMBZ5240BS-7-F, MMBZ5240B-7-F delivers 55% higher power capability and 47% lower ZZT, making it optimal for robust shunt regulation in industrial and automotive subsystems where thermal margin and voltage stability are critical.
Availability
MMBZ5240B-7-F is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset supervision, and industrial sensor signal conditioning requiring stable component supply across high-volume production and long-lifecycle programs.
Supply support for MMBZ5240B-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, specializing in high-reliability components for automotive, industrial, and computing markets with ISO/TS 16949 and IATF 16949 certified operations.
This device belongs to the MMBZ52xxB series of 350 mW Zener diodes designed specifically for automated SMT assembly in cost-sensitive, high-yield production environments demanding JEDEC-qualified reliability and green compliance.
FAQ
What is the maximum continuous reverse voltage that MMBZ5240B-7-F can withstand without breakdown?
The device exhibits sharp reverse breakdown at its nominal Zener voltage of 10.0 V, with guaranteed regulation between 9.5 V and 10.5 V at 20 mA. Below 8.0 V, reverse leakage remains ≤3.0 µA; sustained operation above 10.5 V risks thermal runaway unless current is strictly limited by external series resistance.
Can MMBZ5240B-7-F be used in place of a 10 V linear regulator for powering small loads?
No-it is a two-terminal shunt regulator, not a three-terminal series regulator. It requires a series current-limiting resistor to set operating current and cannot deliver regulated output current without significant voltage drop or thermal instability. It is intended for voltage reference or clamping, not load powering.
Is MMBZ5240B-7-F qualified for automotive applications per AEC-Q200?
The base part is manufactured in IATF 16949 certified facilities and meets JEDEC high-reliability standards referenced in AEC-Q200. For formal AEC-Q200 qualification, the Q-suffix variant (e.g., MMBZ5240BQ-7-F) must be selected, which undergoes full stress testing and PPAP documentation.
How does the SOT23 package affect thermal performance compared to larger packages like DO-35?
In SOT23 on FR-4, RθJA is 357 °C/W-significantly higher than DO-35's ~200 °C/W-limiting usable power to 350 mW before exceeding 150 °C junction temperature. Layout improvements (thermal vias, copper pour) can reduce RθJA by up to 30%, but absolute max PD remains constrained by package geometry.
MMBZ5240B-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):
- 10 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 8 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-23-3
MMBZ5240B-7-F FAQ
1.How can I place an order for MMBZ5240B-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5240B-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 MMBZ5240B-7-F reliable?
The price and inventory of MMBZ5240B-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 MMBZ5240B-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5240B-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5240B-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5240B-7-F?
MMBZ5240B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5240B-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 MMBZ5240B-7-F?
For technical support, including MMBZ5240B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5240B-7-F requirements.
6.How does Aetrix verify that MMBZ5240B-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5240B-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 MMBZ5240B-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5240B-7-F?
All MMBZ5240B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5240B-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 MMBZ5240B-7-F part is unused and in its original packaging.
Return procedure for MMBZ5240B-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5240B-7-F Tags
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