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onsemi MMSZ5242ET1
- Part No.:
- MMSZ5242ET1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5242ET1.pdf
- Description:
- DIODE ZENER 12V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,674
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Product details
Overview
MMSZ5242ET1 from onsemi is a 12 V ±5% Zener voltage regulator diode in SOD-123 surface-mount package, rated for 500 mW power dissipation at 75 °C on FR-5 board, with 30 Ω maximum dynamic impedance at 20 mA test current and 1 μA reverse leakage at 9.1 V, used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMSZ5242ET1 datasheet, pinout, applications, or equivalent options, key selection considerations include its 12 V nominal Zener voltage tolerance, thermal derating behavior above 75 °C, cathode-anode polarity marking, and compatibility with automated SMT assembly on high-density PCBs.
Technical Context
This device operates as a two-terminal silicon Zener diode optimized for stable reverse-biased voltage regulation. It achieves regulation via avalanche breakdown at 12 V nominal, with specified test conditions of IZT = 20 mA and VF ≤ 0.9 V at 10 mA forward current.
Its thermal design relies on junction-to-lead resistance of 150 °C/W and junction-to-ambient resistance of 340 °C/W, enabling operation across −55 °C to +150 °C ambient range. The SOD-123 package supports peak surge power of 225 W for 8 × 20 μs pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.4–12.6 V at IZT = 20 mA; ±5% tolerance ensures predictable clamping in feedback loops. |
| Power Dissipation (PD) | 500 mW at TL = 75 °C; derates linearly at 6.7 mW/°C above 75 °C for thermal margining. |
| Zener Impedance (ZZT) | ≤30 Ω at IZT = 20 mA; low dynamic impedance maintains regulation stability under load transients. |
| Reverse Leakage (IR) | ≤0.25 μA at VR = 9.1 V; minimal leakage preserves accuracy in high-impedance bias networks. |
| ESD Rating | Class 3 (>16 kV HBM); robust electrostatic immunity simplifies handling and board-level ESD design. |
| Package | SOD-123 (1.60 × 2.69 × 1.16 mm); compact footprint enables placement in space-constrained DC-DC feedback paths. |
Pinout & Package
SOD-123 plastic surface-mount package with molded case, cathode indicated by band; polarity critical for correct reverse-bias operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; must be held at higher potential than anode during regulation. |
| 2 (Non-Banded End) | Anode | Connected to ground or lower-potential reference; completes reverse-bias path for Zener conduction. |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Supports continuous regulation in low-current analog rails without external heatsinking. |
| 12 V Nominal Zener Voltage | Matches common logic supply rails (e.g., 12 V industrial sensors) for direct overvoltage clamping. |
| ESD Class 3 Compliance | Eliminates need for additional board-level ESD protection in consumer and industrial interfaces. |
| Pb-Free Construction | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profile requirements. |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Clamp |
|---|---|
Use Scenario: Stabilizing reference voltage for 4–20 mA transmitter loop-powered sensors operating in harsh environments. IC Role / Device Role / Timing Role: Zener voltage reference providing stable 12 V bias to op-amp input stages and ADC references. Use Value: Tight ±5% VZ tolerance and low 30 Ω ZZT ensure <±0.5% reference drift over temperature and load variations. | Use Scenario: Clamping transient overvoltage on USB-C CC lines during hot-plug events. IC Role / Device Role / Timing Role: Bidirectional overvoltage protector limiting CC line voltage to 12 V during fault conditions. Use Value: 225 W surge rating handles 8 × 20 μs ESD pulses per IEC 61000-4-2 without degradation. |
| Automotive Body Control Module (BCM) | Low-Power IoT Node Voltage Reference |
Use Scenario: Providing regulated 12 V reference for microcontroller reset circuitry in 12 V battery-supplied BCMs. IC Role / Device Role / Timing Role: Precision Zener shunt regulator ensuring clean POR (Power-On Reset) threshold. Use Value: AEC-Q101 qualification and −55 °C to +150 °C operating range guarantee reliability in under-hood environments. | Use Scenario: Generating stable 12 V reference for ultra-low-power sensor front-ends in battery-operated NB-IoT nodes. IC Role / Device Role / Timing Role: Low-leakage (≤0.25 μA) voltage clamp maintaining accuracy during multi-year sleep cycles. Use Value: Sub-microamp leakage minimizes quiescent current draw, extending battery life beyond 10 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C12 | 12 V ±5%, 300 mW rating, SOD-323 package, 40 Ω ZZT at 5 mA | Lower power rating and higher dynamic impedance limit use in higher-current regulation paths | Select when board space is constrained and 300 mW suffices; verify thermal margin at target ambient. |
| MMBZ5242ET1G | Identical electrical specs, same SOD-123 package, but in 3-pin SOT-23 configuration with cathode/anode/NC | Requires different footprint and routing; NC pin adds layout complexity without functional benefit | Prefer MMSZ5242ET1 for cost-sensitive, space-optimized designs where dual-terminal simplicity is required. |
Compared with BZX584C12 and MMBZ5242ET1G, the MMSZ5242ET1 delivers superior thermal performance (500 mW vs. 300 mW), lower dynamic impedance (30 Ω vs. 40 Ω), and simpler two-terminal implementation-making it optimal for high-reliability, medium-power Zener regulation where SOD-123 footprint is acceptable.
Availability
MMSZ5242ET1 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C power delivery clamp circuits, and automotive body control modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MMSZ5242ET1 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 MMSZ52xxET1G series was designed specifically for general-purpose, medium-current Zener regulation in space-constrained surface-mount applications, emphasizing manufacturability, thermal robustness, and AEC-Q101 compliance for automotive-grade reliability.
FAQ
What is the nominal Zener voltage of the MMSZ5242ET1 and how tightly is it specified?
The MMSZ5242ET1 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 (IZT). This ±5% tolerance is measured under thermal equilibrium at lead temperature TL = 30 °C ±1 °C, ensuring consistent regulation across production lots and operating conditions. The MMSZ5242ET1's tight tolerance supports accurate voltage referencing in feedback networks without trimming.
How does the MMSZ5242ET1 handle thermal derating above 75 °C?
The MMSZ5242ET1 derates linearly at 6.7 mW/°C above 75 °C ambient or lead temperature, dropping from its full 500 mW rating at 75 °C to zero at approximately 149 °C. This derating curve is defined for FR-5 board mounting with minimum recommended footprint, and must be applied in thermal simulations to ensure safe operation in enclosed or high-temperature environments. The MMSZ5242ET1's RJL = 150 °C/W supports effective heat transfer to the PCB copper.
Can the MMSZ5242ET1 be used in automotive applications?
Yes-the MMSZ5242ET1 is AEC-Q101 qualified and PPAP capable when ordered as SZMMSZ5242ET1G, meeting automotive reliability standards for temperature cycling, humidity, and mechanical stress. While the base MMSZ5242ET1 is not automotive-grade, its construction, SOD-123 package, and −55 °C to +150 °C operating range make it suitable for non-safety-critical automotive subsystems such as lighting controls and infotainment power rails. Always specify the SZ-prefix variant for formal automotive qualification.
What is the maximum reverse leakage current for the MMSZ5242ET1 and at what voltage is it specified?
The MMSZ5242ET1 exhibits a maximum reverse leakage current of 0.25 μA at a reverse voltage (VR) of 9.1 V, measured at 25 °C ambient. This low leakage ensures minimal error in high-impedance voltage divider networks and preserves battery life in always-on IoT nodes. Leakage increases with temperature and voltage, so system-level validation at worst-case VR and TJ is recommended for precision applications using the MMSZ5242ET1.
Does the MMSZ5242ET1 have ESD protection built-in, and if so, to what standard?
Yes-the MMSZ5242ET1 features an ESD rating of Class 3 per the Human Body Model (HBM), exceeding 16 kV. This level of on-chip ESD robustness eliminates the need for discrete TVS devices in many interface protection schemes and simplifies handling during manufacturing. The MMSZ5242ET1's ESD capability is intrinsic to its silicon process and packaging, verified per ANSI/ESDA/JEDEC JS-001, and applies across its full operating temperature range.
MMSZ5242ET1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 500 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:
- SOD-123
MMSZ5242ET1 FAQ
1.How can I place an order for MMSZ5242ET1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5242ET1 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 MMSZ5242ET1 reliable?
The price and inventory of MMSZ5242ET1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5242ET1 is usually 5 days.
3.What payment methods are accepted for MMSZ5242ET1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5242ET1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5242ET1?
MMSZ5242ET1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5242ET1 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 MMSZ5242ET1?
For technical support, including MMSZ5242ET1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5242ET1 requirements.
6.How does Aetrix verify that MMSZ5242ET1 is sourced from the original manufacturer or authorized distributors?
All MMSZ5242ET1 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 MMSZ5242ET1 meets industry standards.
7.What is the process for return or replacement of MMSZ5242ET1?
All MMSZ5242ET1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5242ET1, 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 MMSZ5242ET1 part is unused and in its original packaging.
Return procedure for MMSZ5242ET1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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