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onsemi MMSZ5242ET1G
- Part No.:
- MMSZ5242ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5242ET1G.pdf
- Description:
- DIODE ZENER 12V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:7,410
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Product details
Overview
MMSZ5242ET1G 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 MMSZ5242ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal derating behavior, junction-to-lead thermal resistance, ESD robustness (Class 3 HBM >16 kV), and SOD-123 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining stable reverse-biased conduction above its nominal 12 V Zener voltage with tight ±5% tolerance and temperature coefficient optimized for mid-voltage range (11.4–12.6 V). It exhibits 30 Ω dynamic impedance at IZT = 20 mA and 600 Ω at IZK = 0.25 mA, supporting both regulation and clamping functions.
Designed for automated SMT assembly, the SOD-123 package delivers 150 °C/W junction-to-lead thermal resistance and supports peak surge power of 225 W (8 × 20 µs pulse), with guaranteed operation across −55 °C to +150 °C junction temperature range and UL 94 V-0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.4 V (min) to 12.6 V (max) at IZT = 20 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation (PD) | 500 mW at TL = 75 °C on FR-5 board - sets continuous DC power limit before thermal derating begins |
| Zener Impedance (ZZT) | 30 Ω max at IZT = 20 mA - determines AC regulation stability and ripple rejection capability |
| Reverse Leakage (IR) | 1 µA max at VR = 9.1 V - ensures minimal standby current in undervoltage clamp configurations |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - enables robust handling in unshielded assembly environments |
| Junction Temp Range | −55 °C to +150 °C - supports operation in automotive under-hood and industrial control applications |
| Package | SOD-123 (1.60 × 2.69 × 1.16 mm) - provides compact, lead-free, automated-assembly-compatible footprint |
Pinout & Package
SOD-123 is a 2-lead surface-mount plastic package with cathode indicated by a polarity band. The case is void-free, thermosetting, corrosion-resistant, and UL 94 V-0 rated. Maximum soldering temperature is 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased terminal where Zener breakdown occurs |
| 2 (Non-banded End) | Anode | Connected to circuit ground or lower-potential reference; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables stable voltage reference in space-constrained, medium-current analog subsystems without forced cooling |
| ±5% Zener Voltage Tolerance | Supports precise biasing and threshold detection in sensor interfaces and ADC reference circuits |
| 150 °C/W Junction-to-Lead RJL | Allows efficient heat transfer to PCB copper, enabling higher sustained power in thermally optimized layouts |
| 225 W Peak Surge Capability | Provides transient overvoltage clamping for ESD and inductive switching events without failure |
| Pb-Free & AEC-Q101 Qualified | Meets automotive electronics reliability and environmental compliance requirements for under-dash modules |
Applications
| Automotive Sensor Biasing | Industrial Analog Front-End Protection |
|---|---|
Use Scenario: Providing stable 12 V reference for Hall-effect position sensors in engine control units. IC Role / Device Role / Timing Role: Shunt voltage reference and overvoltage clamp protecting downstream op-amps and ADC inputs. Use Value: Maintains signal integrity across temperature extremes (−40 °C to +125 °C ambient) with <1 µA leakage below 9.1 V. |
Use Scenario: Clamping supply rail transients on 12 V industrial PLC I/O modules exposed to relay coil flyback. IC Role / Device Role / Timing Role: Fast-response shunt protector absorbing 8 × 20 µs surges up to 225 W without degradation. Use Value: Prevents latch-up in microcontroller peripherals while occupying <2.7 mm² PCB area in SOD-123. |
| Portable Medical Device Reference | Consumer Audio DC Bias Network |
Use Scenario: Generating accurate bias voltage for low-noise instrumentation amplifiers in battery-powered ECG monitors. IC Role / Device Role / Timing Role: Precision Zener reference stabilizing gain-setting resistors and offset compensation networks. Use Value: Delivers ±5% voltage accuracy and <30 Ω dynamic impedance to minimize noise coupling into sensitive analog paths. |
Use Scenario: Setting DC operating point for Class-AB headphone amplifier stages in compact Bluetooth speakers. IC Role / Device Role / Timing Role: Low-leakage (1 µA @ 9.1 V) voltage reference ensuring consistent quiescent current across battery discharge cycles. Use Value: Enables stable bias over 3.0–4.2 V Li-ion input range while meeting Class 3 ESD immunity for end-user handling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C12 | 12 V ±5%, 300 mW rating, SOD-323 package (smaller footprint, higher thermal resistance) | Lower power handling limits use in high-current regulation; better suited for ultra-compact portable designs | Select when board space is critical and continuous power <300 mW; verify thermal margin with RJA = 450 °C/W |
| 1N4742A | 12 V ±5%, 1 W rating, DO-41 through-hole package (larger, higher thermal mass) | Higher power capacity but incompatible with SMT-only production; unsuitable for high-density PCBs | Choose only for legacy through-hole designs or prototyping where manual assembly is acceptable |
Compared with BZX584-C12 and 1N4742A, the MMSZ5242ET1G offers optimal balance of SMT compatibility, 500 mW power capability, and AEC-Q101 qualification-making it preferred for automotive and industrial surface-mount systems requiring reliable, space-efficient voltage regulation.
Availability
MMSZ5242ET1G is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial analog front-end protection, and portable medical device reference applications requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for MMSZ5242ET1G 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 manufacturer specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications, with leadership in power management, analog, and sensing technologies.
The MMSZ52xxET1G series belongs to onsemi's general-purpose Zener regulator product line, designed specifically for cost-sensitive, high-volume surface-mount applications requiring stable voltage references and transient protection in compact footprints.
FAQ
What is the nominal Zener voltage and tolerance of the MMSZ5242ET1G?
The MMSZ5242ET1G has a nominal Zener voltage of 12 V with a standard tolerance of ±5%, meaning its actual reverse breakdown voltage falls between 11.4 V and 12.6 V when tested at IZT = 20 mA and TL = 30 °C ±1 °C. This tolerance is confirmed in the Electrical Characteristics table on page 2 of the official onsemi datasheet.
What is the maximum power dissipation rating for the MMSZ5242ET1G and at what condition?
The MMSZ5242ET1G is rated for 500 mW total power dissipation on FR-5 board at lead temperature (TL) = 75 °C, with linear derating of 6.7 mW/°C above that temperature. This rating assumes the minimum recommended footprint per onsemi's mechanical specifications and is distinct from its 225 W nonrepetitive surge capability.
Does the MMSZ5242ET1G meet automotive reliability standards?
Yes, the MMSZ5242ET1G is AEC-Q101 qualified and PPAP capable, with an SZ-prefix variant (SZMMSZ5242ET1G) explicitly designated for automotive applications. Its construction includes Pb-free packaging, Class 3 HBM ESD rating (>16 kV), and operation across −55 °C to +150 °C junction temperature range-meeting core automotive stress and environmental requirements.
What is the reverse leakage current specification for the MMSZ5242ET1G?
The MMSZ5242ET1G specifies a maximum reverse leakage current (IR) of 1 µA at VR = 9.1 V and TA = 25 °C. This value is measured prior to Zener conduction onset and ensures minimal parasitic current draw in undervoltage clamp or standby bias configurations.
What package type and dimensions does the MMSZ5242ET1G use?
The MMSZ5242ET1G uses the SOD-123 surface-mount package (Case 425, Style 1), measuring 1.60 mm × 2.69 mm × 1.16 mm. It features a cathode band marking, Pb-free finish, UL 94 V-0 flammability rating, and is qualified for reflow soldering at 260 °C for 10 seconds.
MMSZ5242ET1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- MMSZ52xxxT1G
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
MMSZ5242ET1G FAQ
1.How can I place an order for MMSZ5242ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5242ET1G 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 MMSZ5242ET1G reliable?
The price and inventory of MMSZ5242ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5242ET1G is usually 5 days.
3.What payment methods are accepted for MMSZ5242ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5242ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5242ET1G?
MMSZ5242ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5242ET1G 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 MMSZ5242ET1G?
For technical support, including MMSZ5242ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5242ET1G requirements.
6.How does Aetrix verify that MMSZ5242ET1G is sourced from the original manufacturer or authorized distributors?
All MMSZ5242ET1G 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 MMSZ5242ET1G meets industry standards.
7.What is the process for return or replacement of MMSZ5242ET1G?
All MMSZ5242ET1G units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5242ET1G, 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 MMSZ5242ET1G part is unused and in its original packaging.
Return procedure for MMSZ5242ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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