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onsemi MMBZ5242ELT3G
- Part No.:
- MMBZ5242ELT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5242ELT3G.pdf
- Description:
- DIODE ZENER 12V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,374
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Product details
Overview
MMBZ5242ELT3G 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 portable electronics.
For engineers reviewing the MMBZ5242ELT3G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (556 °C/W on FR-5), ESD rating (>16 kV HBM), peak pulse power (225 W), and SOT-23 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates in reverse breakdown mode to maintain stable voltage regulation across varying load currents. Its 12 V nominal Zener voltage exhibits a positive temperature coefficient near zero crossing, minimizing drift over −65°C to +150°C junction range.
The SOT-23 package features a defined pinout (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode) and supports automated placement. Thermal performance is specified for FR-5 board (225 mW) and alumina substrate (300 mW), with derating above 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.4–12.6 V @ IZT = 20 mA - ensures ±5% regulation accuracy under standard test conditions |
| Power Dissipation (PD) | 225 mW on FR-5 board @ TA = 25°C - defines maximum continuous DC power handling in standard PCB environment |
| Zener Impedance (ZZT) | 30 Ω @ IZT = 20 mA - determines output voltage stability under small-signal AC load variations |
| 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) per HBM - guarantees robustness against human-body electrostatic discharge during handling and assembly |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 - quantifies junction-to-ambient heat transfer limitation affecting long-term reliability at elevated ambient temperatures |
| Peak Pulse Power | 225 W @ 8 × 20 μs - supports transient overvoltage suppression without failure in surge-prone interfaces |
Pinout & Package
SOT-23 (TO-236) surface-mount plastic package, 2.90 mm × 1.30 mm × 1.00 mm body size, void-free thermosetting case with corrosion-resistant finish. Polarity indicated by cathode band; maximum soldering temperature 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential side of regulated node; reverse-biased during Zener operation |
| Pin 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| Pin 3 | Cathode | Connected to higher-potential side; voltage reference point and primary heat path to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW power rating on FR-5 board | Enables compact voltage clamping in space-constrained portable designs without external heatsinking |
| ESD rating >16 kV (HBM) | Eliminates need for additional ESD protection components in handheld device front-end circuits |
| Pb-free and RoHS-compliant packaging | Meets global environmental compliance requirements for consumer and industrial end products |
| Small SOT-23 footprint | Supports ≥2× higher component density vs. DO-35 or SOD-123 packages in multi-rail power management sections |
| 12 V Zener voltage with ±5% tolerance | Provides tight regulation for 12 V logic interface protection or analog reference stabilization |
Applications
| USB Port Protection | Smartphone Battery Monitoring |
|---|---|
|
Use Scenario: Clamping transient surges on USB D+/D− lines during hot-plug events. IC Role / Device Role / Timing Role: Standalone bidirectional voltage clamp protecting USB transceiver I/O pins. Use Value: Limits line voltage to ≤12.6 V using 12 V Zener breakdown, preventing damage to 3.3 V tolerant PHY circuitry. |
Use Scenario: Providing stable reference for fuel gauge ADC in lithium-ion battery packs. IC Role / Device Role / Timing Role: Precision shunt reference generating known voltage for battery voltage measurement scaling. Use Value: Delivers 12 V ±5% reference with <30 Ω impedance, reducing ADC gain error contribution to <0.3% FS. |
| IoT Sensor Node Power Rail Clamp | Industrial PLC Input Conditioning |
|
Use Scenario: Suppressing EFT bursts on 12 V sensor supply rails in wireless edge nodes. IC Role / Device Role / Timing Role: Fast-response overvoltage protector placed directly at rail entry point. Use Value: Absorbs 225 W pulses (8 × 20 μs) without degradation, maintaining system uptime in noisy factory environments. |
Use Scenario: Level-shifting and noise filtering for 12 V digital inputs in programmable logic controllers. IC Role / Device Role / Timing Role: Shunt regulator establishing clean 12 V threshold for optocoupler input stage. Use Value: Maintains <1 μA leakage at 9.1 V, ensuring reliable logic-low detection while rejecting common-mode noise. |
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 | Same 12 V nominal Zener, but 350 mW rating on FR-4 and higher ZZT (40 Ω @ 5 mA) | Higher power handling suits higher-current bias networks; less precise regulation at low currents | Select when >225 mW continuous dissipation is required and tighter impedance at 20 mA is not critical |
| MMBZ5242BS | Same electrical specs but in SOD-123 package (3.7 mm × 1.6 mm), no NC pin | Larger footprint increases PCB area use but improves thermal dissipation margin on low-copper boards | Select when SOT-23 assembly capability is unavailable or when higher thermal mass is needed for intermittent surge duty |
Compared with BZX84-C12LT1G and MMBZ5242BS, the MMBZ5242ELT3G offers optimal balance of SOT-23 miniaturization, 20 mA Zener impedance performance, and AEC-Q101-aligned process control-making it preferred for high-density portable and automotive-qualified designs where board space and regulation precision are constrained.
Availability
MMBZ5242ELT3G is available at Aetrix Electronics and suitable for USB port protection, smartphone battery monitoring, IoT sensor node power rail clamp, and industrial PLC input conditioning requiring stable component supply and consistent parametric performance.
Supply support for MMBZ5242ELT3G 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and intelligent devices.
The MMBZ52xxELT3G series belongs to onsemi's precision Zener voltage regulator product line, engineered specifically for space-constrained, low-power voltage reference and transient suppression in portable and high-reliability electronics.
FAQ
What is the Zener voltage tolerance of MMBZ5242ELT3G?
The MMBZ5242ELT3G 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 and is verified per onsemi's production testing protocol.
Does MMBZ5242ELT3G have a functional pin 2 connection?
No, MMBZ5242ELT3G Pin 2 is internally not connected (NC). The device uses only Pins 1 (Anode) and 3 (Cathode) for operation. PCB layout must leave Pin 2 unconnected - no trace, pad, or thermal relief should be attached to it.
Can MMBZ5242ELT3G be used for bidirectional ESD protection?
No - MMBZ5242ELT3G is a unidirectional Zener diode optimized for reverse-bias regulation. For bidirectional ESD protection, a dedicated TVS array like ESD9X5.0ST5G is required. The MMBZ5242ELT3G conducts only when cathode is biased ≥12.6 V above anode.
What is the maximum allowable junction temperature for MMBZ5242ELT3G?
The MMBZ5242ELT3G has a junction and storage temperature range of −65°C to +150°C. Operation beyond +150°C risks permanent parametric shift or catastrophic failure. Derating curves in the datasheet define safe operating area based on ambient temperature and PCB thermal design.
Is MMBZ5242ELT3G compliant with automotive standards?
The MMBZ5242ELT3G is not AEC-Q101 qualified. For automotive applications, the SZMMBZ5242ELT1G variant - which shares identical electrical specs but includes AEC-Q101 qualification and PPAP capability - must be selected instead.
MMBZ5242ELT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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)
MMBZ5242ELT3G FAQ
1.How can I place an order for MMBZ5242ELT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5242ELT3G 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 MMBZ5242ELT3G reliable?
The price and inventory of MMBZ5242ELT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5242ELT3G is usually 5 days.
3.What payment methods are accepted for MMBZ5242ELT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5242ELT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5242ELT3G?
MMBZ5242ELT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5242ELT3G 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 MMBZ5242ELT3G?
For technical support, including MMBZ5242ELT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5242ELT3G requirements.
6.How does Aetrix verify that MMBZ5242ELT3G is sourced from the original manufacturer or authorized distributors?
All MMBZ5242ELT3G 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 MMBZ5242ELT3G meets industry standards.
7.What is the process for return or replacement of MMBZ5242ELT3G?
All MMBZ5242ELT3G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5242ELT3G, 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 MMBZ5242ELT3G part is unused and in its original packaging.
Return procedure for MMBZ5242ELT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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