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onsemi SZMMSZ5242ET1G
- Part No.:
- SZMMSZ5242ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ5242ET1G.pdf
- Description:
- DIODE ZENER 12V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:8,594
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Product details
Overview
SZMMSZ5242ET1G 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 20 mA test current (IZT), 30 Ω maximum dynamic impedance (ZZT), and 1 μA reverse leakage at 9.1 V (VR). It serves as a precision voltage reference or overvoltage clamp in low-power analog and power-supply feedback circuits.
For engineers reviewing the SZMMSZ5242ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal derating behavior, junction-to-lead thermal resistance (150 °C/W), ESD robustness (>16 kV HBM), and automotive-grade qualification per AEC-Q101.
Technical Context
This device operates as a two-terminal, silicon planar Zener diode optimized for stable reverse-biased regulation. Its 12 V nominal Zener voltage exhibits a positive temperature coefficient near zero crossing, minimizing drift across −55 °C to +150 °C operating range. The SOD-123 package enables automated placement while maintaining 225 W nonrepetitive surge capability (8 × 20 µs pulse).
Designed for medium-current regulation, it delivers 12 V reference with ≤30 Ω dynamic impedance at IZT = 20 mA and maintains ≤600 Ω impedance at knee current IZK = 0.25 mA. Reverse leakage remains ≤1 μA at VR = 9.1 V, supporting low-quiescent monitoring functions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.4–12.6 V @ IZT = 20 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation (PD) | 500 mW @ TL = 75 °C - maximum continuous power on FR-5 board before thermal derating begins |
| Zener Impedance (ZZT) | ≤30 Ω @ IZT = 20 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | ≤1 μA @ VR = 9.1 V - guarantees low standby current in voltage-sense or clamping applications |
| ESD Rating | Class 3 (>16 kV) per HBM - supports robust handling in automated assembly and field environments |
| Thermal Resistance (RJL) | 150 °C/W - enables predictable junction temperature rise above lead temperature during operation |
| Peak Surge Power | 225 W (8 × 20 µs) - withstands short-duration overvoltage events without failure |
Pinout & Package
The SZMMSZ5242ET1G is housed in a Pb-free SOD-123 plastic surface-mount package (Case 425, Style 1), measuring 1.60 × 2.69 × 1.16 mm, with cathode indicated by a band. Polarity is unambiguous: Pin 1 = Cathode, Pin 2 = Anode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased terminal where Zener breakdown occurs |
| Pin 2 | Anode | Connected to circuit ground or lower-potential reference; completes bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive underhood and infotainment systems requiring PPAP documentation and site-controlled manufacturing |
| Small SOD-123 Footprint | Enables high-density PCB layouts in space-constrained consumer and industrial modules |
| Low-Leakage Regulation | 1 μA max IR at 9.1 V supports battery-powered voltage monitoring without significant drain |
| High Surge Withstand | 225 W peak pulse rating protects downstream circuitry against transient overvoltages |
| Pb-Free Construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profile requirements |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
Use Scenario: Regulating output of isolated DC-DC converter via optocoupler feedback loop. IC Role / Device Role / Timing Role: Precision 12 V reference source for error amplifier input. Use Value: Tight ±5% VZ tolerance and low ZZT ensure stable output regulation within ±1% over line/load variations. |
Use Scenario: Protecting microcontroller I/O pins from accidental 15 V surges in industrial sensor interface. IC Role / Device Role / Timing Role: Shunt clamp limiting voltage to safe level before damage threshold. Use Value: 225 W surge rating absorbs transient energy; 1 μA leakage avoids signal distortion during normal operation. |
| Voltage Reference | Automotive Sensor Biasing |
Use Scenario: Providing stable 12 V reference for ADC input scaling in data acquisition module. IC Role / Device Role / Timing Role: Low-drift analog reference node for ratiometric measurements. Use Value: Temperature coefficient near zero at 12 V minimizes drift across −40 °C to +125 °C ambient range. |
Use Scenario: Biasing Hall-effect position sensor in EPS (Electric Power Steering) control unit. IC Role / Device Role / Timing Role: AEC-Q101-compliant voltage stabilizer for sensor excitation rail. Use Value: PPAP-capable manufacturing and 150 °C TJ rating support under-hood reliability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5242ET1G | No SZ prefix; commercial grade only; not AEC-Q101 qualified | Lacks automotive qualification and PPAP support; identical electrical specs | Select when automotive compliance is unnecessary and cost sensitivity is higher |
| BZX84-C12LT1G | Higher ZZT (40 Ω max @ 5 mA); different test current (5 mA vs. 20 mA); SOT-23 package | Lower power rating (350 mW); less suitable for sustained 20 mA regulation | Choose only for space-constrained designs accepting reduced regulation stability and thermal margin |
Compared with MMSZ5242ET1G and BZX84-C12LT1G, the SZMMSZ5242ET1G uniquely combines AEC-Q101 qualification, 500 mW power handling, and 20 mA test current-making it the sole option for automotive-grade 12 V regulation where both reliability and performance under load are critical.
Availability
SZMMSZ5242ET1G is available at Aetrix Electronics and suitable for automotive control units, industrial power supplies, and battery-powered instrumentation requiring stable component supply, long-term lifecycle continuity, and traceable sourcing.
Supply support for SZMMSZ5242ET1G 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 SZMMSZ52xxET1G series is part of onsemi's automotive-qualified Zener diode portfolio, engineered specifically for reliable voltage regulation and transient protection in harsh-environment electronic control modules.
FAQ
What is the Zener voltage tolerance for SZMMSZ5242ET1G?
The SZMMSZ5242ET1G has a nominal Zener voltage of 12 V with a standard tolerance of ±5%, resulting in a guaranteed range of 11.4 V to 12.6 V when measured 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 for SZMMSZ5242ET1G.
Is SZMMSZ5242ET1G suitable for automotive applications?
Yes, SZMMSZ5242ET1G is AEC-Q101 qualified and PPAP capable, with manufacturing controlled to meet automotive quality and traceability requirements. The "SZ" prefix explicitly denotes devices built for automotive and other applications needing unique site and process controls-making SZMMSZ5242ET1G appropriate for under-hood ECUs, body control modules, and ADAS sensor interfaces.
What is the maximum reverse leakage current for SZMMSZ5242ET1G?
The maximum reverse leakage current (IR) for SZMMSZ5242ET1G is 1 μA at VR = 9.1 V and TA = 25 °C, as specified in the Electrical Characteristics table. This low leakage supports energy-sensitive applications such as battery-backed voltage monitoring and low-power sensor biasing without compromising standby current budgets.
How does thermal derating work for SZMMSZ5242ET1G?
SZMMSZ5242ET1G is rated for 500 mW power dissipation at TL = 75 °C on FR-5 board, with linear derating of 6.7 mW/°C above that temperature. At 125 °C lead temperature, its usable power drops to approximately 165 mW. This derating curve is defined in the Maximum Ratings table and validated per JEDEC JESD51-2 thermal test standards.
What package type and dimensions does SZMMSZ5242ET1G use?
SZMMSZ5242ET1G uses the SOD-123 surface-mount package (Case 425, Style 1), with physical dimensions of 1.60 mm × 2.69 mm × 1.16 mm. The cathode is marked by a band at Pin 1; Pin 2 is the anode. This package is optimized for high-speed pick-and-place assembly and meets UL 94 V-0 flammability rating.
SZMMSZ5242ET1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- SZMMSZ52xxxT1G
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
SZMMSZ5242ET1G FAQ
1.How can I place an order for SZMMSZ5242ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ5242ET1G 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 SZMMSZ5242ET1G reliable?
The price and inventory of SZMMSZ5242ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ5242ET1G is usually 5 days.
3.What payment methods are accepted for SZMMSZ5242ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ5242ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ5242ET1G?
SZMMSZ5242ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ5242ET1G 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 SZMMSZ5242ET1G?
For technical support, including SZMMSZ5242ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ5242ET1G requirements.
6.How does Aetrix verify that SZMMSZ5242ET1G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ5242ET1G 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 SZMMSZ5242ET1G meets industry standards.
7.What is the process for return or replacement of SZMMSZ5242ET1G?
All SZMMSZ5242ET1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ5242ET1G, 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 SZMMSZ5242ET1G part is unused and in its original packaging.
Return procedure for SZMMSZ5242ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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