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Diodes Incorporated MMBZ5242BW-7
- Part No.:
- MMBZ5242BW-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
MMBZ5242BW-7.pdf
- Description:
- DIODE ZENER 12V 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:4,083
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Product details
Overview
MMBZ5242BW-7 from Diodes Incorporated is a 12 V, 200 mW surface-mount Zener diode in SOT323 package, rated for ±5% zener voltage tolerance (11.4–12.6 V), with 30 Ω dynamic impedance at 20 mA test current and 1.0 µA reverse leakage at 9.1 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning circuits.
For engineers reviewing the MMBZ5242BW-7 datasheet, MMBZ5242BW-7 pinout, MMBZ5242BW-7 application, or MMBZ5242BW-7 equivalent, key selection criteria include zener voltage accuracy, thermal resistance (625 °C/W), AEC-Q101 qualification, lead-free/Green compliance, and SOT323 footprint compatibility in space-constrained PCB layouts.
Technical Context
This device operates in reverse breakdown mode to maintain stable voltage regulation under varying load and temperature conditions. Its 200 mW power rating and 625 °C/W junction-to-ambient thermal resistance define its usable current range and derating behavior above +25°C ambient.
The zener voltage is specified at 20 mA test current with 30 Ω impedance at that point and 600 Ω at 0.25 mA knee current, indicating predictable turn-on characteristics suitable for low-current biasing and sensing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 12 V - Stable regulation point for reference or clamping at typical operating current |
| Zener Voltage Range | 11.4–12.6 V - ±5% tolerance ensures predictable performance across production lots |
| Power Dissipation | 200 mW - Maximum continuous DC power handling on FR4 board with recommended pad layout |
| Zener Impedance | 30 Ω @ 20 mA - Low dynamic resistance enables tight voltage regulation under load variation |
| Reverse Leakage | 1.0 µA @ 9.1 V - Minimal off-state current preserves battery life in always-on monitoring circuits |
| Thermal Resistance | 625 °C/W - Requires derating above +25°C; full power only at ambient ≤ +75°C per Fig. 1 |
| AEC-Q101 Qualified | Yes - Validated for automotive electronics requiring high reliability and temperature cycling robustness |
Pinout & Package
Package: SOT323 - 3-terminal surface-mount plastic package measuring 2.20 × 1.35 × 0.90 mm (L × W × H), with matte tin-plated Alloy 42 leads, moisture sensitivity level 1, and UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node during normal operation; used for cathode-referenced clamping |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to higher-potential node; defines regulated output voltage relative to anode |
| Case / Heat Sink (Pin 3) | Thermal path / mechanical anchor | Internally connected to cathode; provides primary thermal conduction path to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Lead-free & Green construction | Halogen- and antimony-free molding compound (<900 ppm Br/Cl, <1000 ppm Sb) meeting RoHS 2 |
| SOT323 footprint | Enables automated placement and reflow soldering in high-volume manufacturing |
| Low leakage at VR = 9.1 V | 1.0 µA ensures minimal quiescent current draw in battery-powered voltage monitor circuits |
| Stable 12 V reference | ±5% tolerance and 30 Ω impedance support repeatable analog calibration without trimming |
Applications
| Automotive Cabin Sensors | Industrial Signal Conditioning |
|---|---|
Use Scenario: Voltage reference for MEMS pressure sensor signal chain in HVAC control modules. IC Role / Device Role / Timing Role: Zener diode providing stable 12 V reference for ADC bias and op-amp rail splitting. Use Value: AEC-Q101 qualification ensures operation across –40°C to +125°C ambient; ±5% tolerance eliminates need for post-calibration trimming. | Use Scenario: Overvoltage clamp protecting 12 V RS-485 transceiver inputs from ESD transients. IC Role / Device Role / Timing Role: Shunt protection device limiting input voltage to safe levels during surge events. Use Value: 200 mW rating and 30 Ω impedance enable fast response to 1 kV ESD pulses while maintaining low clamping voltage. |
| Portable Medical Monitors | Smart Energy Metering |
Use Scenario: Precision bias source for low-noise instrumentation amplifier in wearable ECG front-end. IC Role / Device Role / Timing Role: Zener reference establishing common-mode voltage for differential signal acquisition. Use Value: 1.0 µA leakage at 9.1 V minimizes current drain in coin-cell–powered devices; SOT323 saves board area. | Use Scenario: Voltage supervisor reference for microcontroller brown-out detection in DIN-rail meters. IC Role / Device Role / Timing Role: Stable 12 V threshold generator triggering reset when supply drops below safe operating level. Use Value: Tight 11.4–12.6 V range ensures deterministic reset timing across temperature and unit variance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C12LT1G | Same 12 V nominal, ±5% tolerance, but 350 mW rating and SOT23 package | Higher power handling supports transient clamping in industrial I/O; larger footprint requires layout change | Select if >200 mW surge capability is required and SOT23 is acceptable |
| MMSZ5242ET1G | Identical 12 V, ±5%, 200 mW rating but in SOD-123 package with 400 mW peak pulse rating | Higher surge immunity suits metering applications with lightning-induced surges; different thermal profile | Select if enhanced non-repetitive surge robustness (per Fig. 6) is critical |
Compared with BZX84-C12LT1G and MMSZ5242ET1G, MMBZ5242BW-7 offers AEC-Q101 qualification and SOT323 miniaturization-making it optimal for automotive and space-limited designs where reliability and footprint are prioritized over raw surge margin.
Availability
MMBZ5242BW-7 is available at Aetrix Electronics and suitable for automotive cabin sensors, industrial signal conditioning, portable medical monitors, and smart energy metering requiring stable component supply and long-term lifecycle assurance.
Supply support for MMBZ5242BW-7 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' standard Zener diode product line, engineered for high-reliability voltage reference and protection in automotive, industrial, and consumer electronics where small size and AEC-Q101 compliance are essential.
FAQ
What is the maximum continuous reverse voltage (VR) this Zener can withstand without breakdown?
The MMBZ5242BW-7 has a specified maximum reverse leakage current of 1.0 µA at VR = 9.1 V. Breakdown begins near 11.4 V (minimum zener voltage), so sustained reverse bias above 9.1 V is permissible only if leakage current remains within system limits-operation above 11.4 V enters regulation zone.
Is this part suitable for use in high-humidity environments like automotive engine compartments?
Yes. The SOT323 package uses UL 94V-0 mold compound and meets J-STD-020D moisture sensitivity level 1, meaning it can be stored indefinitely at ≤30°C/60% RH without baking prior to reflow. AEC-Q101 qualification further validates performance under humidity cycling and high-temperature storage.
How does the 625 °C/W thermal resistance impact PCB layout decisions?
This value assumes mounting on FR4 with Diodes' recommended pad layout (AP02001). To avoid exceeding 150°C junction temperature at 200 mW, ambient must stay ≤75°C. Layout must maximize copper area connected to Pin 3 (cathode/case) and avoid thermal isolation-small pads or thin traces will cause significant derating.
Can this Zener be used in place of a 12 V TVS diode for ESD protection?
No. While it clamps above 11.4 V, its 200 mW DC rating and lack of defined peak pulse power (unlike dedicated TVS devices) make it unsuitable for IEC 61000-4-2 ESD events. Use only for low-energy biasing or slow overvoltage limiting-not transient suppression.
MMBZ5242BW-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 200 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
MMBZ5242BW-7 FAQ
1.How can I place an order for MMBZ5242BW-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5242BW-7 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 MMBZ5242BW-7 reliable?
The price and inventory of MMBZ5242BW-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5242BW-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5242BW-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5242BW-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5242BW-7?
MMBZ5242BW-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5242BW-7 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 MMBZ5242BW-7?
For technical support, including MMBZ5242BW-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5242BW-7 requirements.
6.How does Aetrix verify that MMBZ5242BW-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5242BW-7 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 MMBZ5242BW-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5242BW-7?
All MMBZ5242BW-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5242BW-7, 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 MMBZ5242BW-7 part is unused and in its original packaging.
Return procedure for MMBZ5242BW-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5242BW-7 Tags
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Diodes Incorporated
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