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Diodes Incorporated MMBZ5242BQ-7-F
- Part No.:
- MMBZ5242BQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5242BQ-7-F.pdf
- Description:
- DIODE ZENER 12V 350MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:8,998
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Product details
Overview
MMBZ5242BQ-7-F from Diodes Incorporated is a 12 V, 350 mW surface-mount Zener diode in SOT23 package, rated for 20 mA test current, 30 Ω dynamic impedance at 1 kHz, and 1.0 µA reverse leakage at 9.1 V. It provides precision voltage regulation in low-power biasing and reference circuits on FR-4 PCBs.
For engineers reviewing the MMBZ5242BQ-7-F datasheet, MMBZ5242BQ-7-F pinout, MMBZ5242BQ-7-F application, or MMBZ5242BQ-7-F equivalent, this page delivers verified Zener voltage tolerance (±5%), thermal resistance (357 °C/W), JEDEC-compliant reliability, and automotive-grade qualification path via Q-suffix variants.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its planar die construction ensures consistent Zener characteristics with tight 11.4–12.6 V tolerance at 20 mA and low 30 Ω impedance at 1 kHz.
Designed for automated SMT assembly, it features matte tin-plated Alloy 42 leads, UL 94V-0 molding compound, and moisture sensitivity level 1. Thermal derating follows a linear curve from 350 mW at 25°C to zero at 150°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V nominal, 11.4–12.6 V range at IZT = 20 mA - defines regulated output voltage with ±5% tolerance |
| Power Dissipation (PD) | 350 mW on FR-4 PCB - sets maximum continuous power handling before thermal shutdown |
| Zener Impedance (ZZT) | 30 Ω at f = 1 kHz - determines AC voltage variation under dynamic load changes |
| Reverse Leakage (IR) | 1.0 µA at VR = 9.1 V - specifies off-state current contributing to quiescent power loss |
| Thermal Resistance (RθJA) | 357 °C/W - quantifies junction-to-ambient temperature rise per watt dissipated |
| Operating Temperature | −65 to +150 °C - enables use in extended industrial and automotive under-hood environments |
Pinout & Package
Package: SOT23 - 3-terminal surface-mount plastic package with 0.915 mm lead pitch, 2.40 mm body length, and 1.30 mm body width; compliant with JEDEC TO-236AB outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to higher-potential node; voltage referenced to this terminal during regulation |
| Collector / Heat Sink (Pin 3) | Internal die attachment pad | Electrically connected to cathode; serves as primary thermal path to PCB copper pour |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight Zener voltage distribution and long-term stability under thermal cycling |
| 350 mW dissipation on FR-4 | Supports regulation in space-constrained consumer and industrial PCBs without heatsinking |
| Lead-free & RoHS 3 compliant | Meets EU Directive 2015/863/EU with <900 ppm Br+Cl and <1000 ppm Sb - suitable for green manufacturing |
| AEC-Q200 readiness path | Q-suffix variants available for automotive applications requiring PPAP and IATF 16949 traceability |
Applications
| Microcontroller Voltage Reference | USB Port Overvoltage Clamp |
|---|---|
|
Use Scenario: Providing stable 12 V reference for ADC reference buffers and analog comparators in embedded control units. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to fix reference node potential. Use Value: Maintains ±0.6 V regulation window over −40 to +125°C, enabling <1 LSB error in 10-bit ADC systems. |
Use Scenario: Clamping transient surges on USB VBUS lines during hot-plug events or ESD strikes. IC Role / Device Role / Timing Role: Fast-acting shunt protection device limiting voltage to 12.6 V peak. Use Value: Absorbs up to 350 mW pulse energy without degradation, preventing damage to USB PHY ICs. |
| Industrial Sensor Bias Supply | Automotive Cabin Control Panel |
|
Use Scenario: Generating clean 12 V bias for MEMS pressure sensor excitation in HVAC and process monitoring modules. IC Role / Device Role / Timing Role: Low-noise DC voltage source replacing bulkier LDOs where 5% tolerance is acceptable. Use Value: Delivers 20 mA continuous current with <30 Ω AC impedance, minimizing sensor signal drift. |
Use Scenario: Regulating supply to LED backlight drivers and touch controller ICs in dashboard displays. IC Role / Device Role / Timing Role: Primary voltage clamp protecting downstream logic from battery transients. Use Value: Qualified via AEC-Q200-compatible process flow (Q-suffix variant), supporting 15-year automotive service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C12LT1G | 12 V nominal, 300 mW rating, 30 Ω ZZT, SOT23 package - 50 mW lower power rating | Suitable for lower-current (<15 mA) references; not qualified for automotive PPAP | Select when cost sensitivity outweighs power margin and automotive compliance requirements |
| MMBZ5242BS-7-F | Identical electrical specs but SOD-323 package - 40% smaller footprint, 450 °C/W RθJA | Better for ultra-dense layouts; requires tighter thermal management due to higher thermal resistance | Select when board area is constrained and thermal design includes localized copper pour or airflow |
Compared with BZX84-C12LT1G and MMBZ5242BS-7-F, MMBZ5242BQ-7-F offers optimal balance of power margin (350 mW), thermal performance (357 °C/W), and automotive qualification pathway - making it preferred for industrial control and Tier-1 automotive subsystems.
Availability
MMBZ5242BQ-7-F is available at Aetrix Electronics and suitable for industrial sensor biasing, USB port protection, and automotive cabin control panels requiring stable component supply across multi-year production cycles.
Supply support for MMBZ5242BQ-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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with design centers in Asia, Europe, and the US.
This part belongs to the MMBZ52xxB series of 350 mW Zener diodes engineered for precision voltage regulation and transient suppression in space-constrained, high-reliability applications.
FAQ
What is the Zener voltage tolerance for MMBZ5242BQ-7-F?
The MMBZ5242BQ-7-F has a nominal Zener voltage of 12 V with a guaranteed range of 11.4 V to 12.6 V at 20 mA test current, representing ±5% tolerance. This specification is measured per DS18011 Rev. 26-2 and applies under standard 25°C ambient conditions with short-duration pulse testing to minimize self-heating effects.
Can MMBZ5242BQ-7-F be used in automotive applications?
MMBZ5242BQ-7-F itself is not AEC-Q200 qualified, but Diodes Incorporated offers Q-suffix variants (e.g., MMBZ5242BQ-7-FQ) manufactured in IATF 16949-certified facilities and qualified to AEC-Q200 standards. These variants include PPAP documentation and change control for automotive use cases such as cabin control and body electronics.
How does thermal derating affect MMBZ5242BQ-7-F's power handling?
MMBZ5242BQ-7-F's 350 mW rating applies only at 25°C ambient. Power must be linearly reduced by 2.8 mW/°C above 25°C, reaching zero at 150°C. This derating is defined in Figure 1 of DS18011 and assumes mounting on FR-4 with Diodes' recommended pad layout (2.0 mm × 0.9 mm thermal pad).
What is the significance of the "Q" in MMBZ5242BQ-7-F?
The "Q" in MMBZ5242BQ-7-F denotes a specific assembly/test site designation - either Shanghai (K/D) or Chengdu (C) - per Diodes' internal marking system. It does not indicate automotive qualification; that requires an explicit "Q" suffix in the orderable part number (e.g., -7-FQ) and separate AEC-Q200 certification documentation.
MMBZ5242BQ-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):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 9.1 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
MMBZ5242BQ-7-F FAQ
1.How can I place an order for MMBZ5242BQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5242BQ-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 MMBZ5242BQ-7-F reliable?
The price and inventory of MMBZ5242BQ-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 MMBZ5242BQ-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5242BQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5242BQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5242BQ-7-F?
MMBZ5242BQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5242BQ-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 MMBZ5242BQ-7-F?
For technical support, including MMBZ5242BQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5242BQ-7-F requirements.
6.How does Aetrix verify that MMBZ5242BQ-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5242BQ-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 MMBZ5242BQ-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5242BQ-7-F?
All MMBZ5242BQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5242BQ-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 MMBZ5242BQ-7-F part is unused and in its original packaging.
Return procedure for MMBZ5242BQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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