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onsemi MMBZ5242ELT1G
- Part No.:
- MMBZ5242ELT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5242ELT1G.pdf
- Description:
- DIODE ZENER 12V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:10,756
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Product details
Overview
MMBZ5242ELT1G from onsemi is a 12 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation at 25°C, with 30 Ω dynamic impedance at 20 mA test current and 1 μA leakage at 9.1 V reverse bias. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning circuits.
For engineers reviewing the MMBZ5242ELT1G datasheet, pinout, applications, or equivalent options, key selection criteria include its 12 V nominal Zener voltage tolerance, thermal coefficient of +2.5 mV/°C (typical), ESD rating >16 kV HBM, and compatibility with high-density PCB layouts requiring minimal footprint.
Technical Context
This device operates in reverse breakdown mode to maintain stable voltage across its cathode-anode terminals under varying load or supply conditions. Its 225 mW power rating on FR-5 board and 300 mW on alumina substrate define thermal limits for continuous DC or pulsed operation up to 225 W (8 × 20 µs).
The SOT-23 package features Pin 1 (Anode), Pin 2 (No Connection), and Pin 3 (Cathode), with polarity indicated by a band on the cathode end. Its 1.00 mm height and 2.90 × 1.30 mm footprint support automated placement and reflow soldering per JEDEC J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.4–12.6 V @ IZT = 20 mA - defines regulated output voltage range under standard test conditions |
| Power Dissipation (PD) | 225 mW @ TA = 25°C on FR-5 - sets maximum continuous DC power before thermal derating begins |
| Zener Impedance (ZZT) | 30 Ω @ IZT = 20 mA - determines voltage regulation stability under load transients |
| Leakage Current (IR) | 1 μA @ VR = 9.1 V - specifies off-state conduction level critical for low-power standby circuits |
| ESD Rating | Class 3 (>16 kV) HBM - ensures robustness against handling-induced electrostatic discharge |
| Junction Temperature Range | −65°C to +150°C - supports operation in automotive under-hood and industrial environments |
| Forward Voltage (VF) | 0.9 V max @ IF = 10 mA - enables use as low-drop rectifier or clamping diode in bidirectional protection |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting plastic case with UL 94 V-0 flammability rating and corrosion-resistant finish. Cathode identified by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in Zener regulation; forward-biased when used as clamp or rectifier |
| 2 | No Connection | Internally unconnected; must remain floating-no PCB trace or pad required |
| 3 | Cathode | Connected to higher-potential node; voltage reference point during reverse breakdown operation |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating on FR-5 Board | Enables compact voltage regulation without external heatsinking in space-constrained portable designs |
| ESD Rating >16 kV (HBM) | Eliminates need for additional ESD protection components in handheld and wearable electronics |
| Pb-Free and RoHS-Compliant Packaging | Meets global environmental compliance requirements for consumer and industrial end products |
| Small SOT-23 Footprint | Reduces PCB area usage by >50% versus SOIC-8 alternatives, supporting ≥1000 components/in² density |
| Temperature Coefficient +2.5 mV/°C (typ.) | Minimizes drift in 12 V reference applications across −40°C to +85°C ambient ranges |
Applications
| Portable Battery Monitoring | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage in Bluetooth earbuds using a 12-bit ADC with internal reference. IC Role / Device Role / Timing Role: Provides stable 12 V reference for ADC input scaling and battery state-of-charge calculation. Use Value: Maintains ±0.5% voltage accuracy over temperature, enabling <1% SoC estimation error without calibration. |
Use Scenario: Clamping transient surges on USB VBUS line caused by hot-plug events or ESD. IC Role / Device Role / Timing Role: Acts as shunt protector, diverting excess energy to ground before reaching downstream USB controller. Use Value: Responds within nanoseconds to 8/20 µs pulses, limiting VBUS to ≤12.6 V and preventing IC latch-up. |
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) |
Use Scenario: Biasing a 4–20 mA current-loop transmitter powered from 24 V rail. IC Role / Device Role / Timing Role: Regulates 12 V local supply for op-amp and DAC circuitry driving the loop. Use Value: Delivers stable 12 V ±5% despite 24 V rail variation from 18–32 V, ensuring loop accuracy to ±0.1% FSR. |
Use Scenario: Providing reference voltage for window lift motor position sensing via potentiometer divider. IC Role / Device Role / Timing Role: Supplies precise 12 V reference to ADC measuring wiper voltage across 10 kΩ pot. Use Value: With 1 μA leakage at 9.1 V, introduces <0.01% error in 10-bit position measurement over full temperature range. |
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-C12LT1G | Same 12 V nominal Zener, but 350 mW PD on FR-5 and 40 Ω ZZT @ 5 mA - higher power, lower test current | Preferred where higher surge tolerance is needed; less suitable for ultra-low-leakage (<1 μA) circuits | Select when system requires higher pulse energy handling without changing layout |
| MMBZ5242BS | Same electrical specs but in SOD-323 package - 1.7 × 1.3 mm vs. SOT-23's 2.9 × 1.3 mm; no NC pin | Better suited for ultra-high-density layouts where 1.2 mm length reduction matters | Choose when board space is constrained beyond SOT-23 capability and NC pin routing is undesirable |
Compared with BZX84-C12LT1G and MMBZ5242BS, the MMBZ5242ELT1G offers optimal balance of low leakage (1 μA), tight Zener tolerance (±5%), and proven manufacturability in SOT-23 pick-and-place lines-making it preferred for cost-sensitive, high-volume portable designs.
Availability
MMBZ5242ELT1G is available at Aetrix Electronics and suitable for portable battery monitoring, USB port overvoltage protection, and industrial sensor signal conditioning requiring stable component supply and long-term lifecycle assurance.
Supply support for MMBZ5242ELT1G 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
onsemi is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZ52xxELT1G series targets space-constrained, low-power voltage regulation needs in portable electronics and high-density PCBs-designed specifically for reliable performance in handheld devices and battery-powered systems.
FAQ
What is the Zener voltage tolerance of MMBZ5242ELT1G?
The MMBZ5242ELT1G has a Zener voltage range of 11.4 V to 12.6 V at 20 mA test current, corresponding to a ±5% tolerance around the nominal 12 V value. This tolerance is guaranteed across the full operating temperature range of −65°C to +150°C and is verified per onsemi's production test flow.
Does MMBZ5242ELT1G have a functional third pin?
No, MMBZ5242ELT1G uses a three-terminal SOT-23 package with Pin 2 designated as No Connection (NC). The internal die connects only to Pin 1 (Anode) and Pin 3 (Cathode); Pin 2 is electrically isolated and must remain unconnected on the PCB to avoid unintended coupling or thermal stress.
Can MMBZ5242ELT1G be used for bidirectional ESD protection?
MMBZ5242ELT1G is optimized for unidirectional Zener regulation and clamping. While its forward voltage is 0.9 V max, its reverse breakdown is precisely specified at 12 V-but it lacks symmetric bidirectional characteristics like those in dedicated TVS diodes. For true bidirectional ESD protection, a dedicated device such as the ESD9B5.0ST5G is recommended instead of MMBZ5242ELT1G.
What is the thermal resistance junction-to-ambient for MMBZ5242ELT1G on FR-5 board?
The thermal resistance junction-to-ambient (RJA) for MMBZ5242ELT1G mounted on FR-5 board is 556°C/W. This value assumes standard JEDEC 2s2p copper layout and defines the temperature rise per milliwatt dissipated-e.g., at 225 mW, junction temperature rises ~125°C above ambient, necessitating derating above 25°C.
Is MMBZ5242ELT1G qualified for automotive applications?
The MMBZ5242ELT1G is not AEC-Q101 qualified. For automotive-grade equivalents, the SZMMBZ5242ELT1G variant-identical electrically but manufactured under automotive-specific process controls and PPAP-capable-is required. MMBZ5242ELT1G is intended for commercial and industrial applications only.
MMBZ5242ELT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- 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:
- 225 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:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
MMBZ5242ELT1G FAQ
1.How can I place an order for MMBZ5242ELT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5242ELT1G 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 MMBZ5242ELT1G reliable?
The price and inventory of MMBZ5242ELT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5242ELT1G is usually 5 days.
3.What payment methods are accepted for MMBZ5242ELT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5242ELT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5242ELT1G?
MMBZ5242ELT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5242ELT1G 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 MMBZ5242ELT1G?
For technical support, including MMBZ5242ELT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5242ELT1G requirements.
6.How does Aetrix verify that MMBZ5242ELT1G is sourced from the original manufacturer or authorized distributors?
All MMBZ5242ELT1G 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 MMBZ5242ELT1G meets industry standards.
7.What is the process for return or replacement of MMBZ5242ELT1G?
All MMBZ5242ELT1G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5242ELT1G, 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 MMBZ5242ELT1G part is unused and in its original packaging.
Return procedure for MMBZ5242ELT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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