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onsemi SZMMSZ5248ET1G
- Part No.:
- SZMMSZ5248ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ5248ET1G.pdf
- Description:
- DIODE ZENER 18V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:25,392
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Product details
Overview
SZMMSZ5248ET1G from onsemi is a 18 V ±5% Zener voltage regulator diode in SOD-123 package, rated for 500 mW power dissipation at 75 °C on FR-5 board, with 7.0 mA test current (IZT), 21 Ω dynamic impedance (ZZT), and 0.1 μA reverse leakage at 14 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 SZMMSZ5248ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal derating behavior, junction-to-lead thermal resistance, and AEC-Q101 qualification status for automotive use.
Technical Context
This device operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its 18 V nominal Zener voltage is specified at IZT = 7.0 mA and TL = 30 °C, with a temperature coefficient optimized for mid-range voltage regulation.
The SOD-123 package provides low thermal resistance (RJL = 150 °C/W) and supports automated placement, while the 225 W peak surge rating (8 × 20 μs pulse) enables transient suppression in compact DC systems without external protection components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1–18.9 V @ IZT = 7.0 mA - defines regulated output range with ±5% tolerance |
| Power Dissipation (PD) | 500 mW @ TL = 75 °C - sets maximum continuous power on standard FR-5 PCB |
| Zener Impedance (ZZT) | 21 Ω @ IZT - determines voltage regulation stability under load variation |
| Reverse Leakage (IR) | 0.1 μA @ VR = 14 V - ensures minimal quiescent current in standby or sensing paths |
| Thermal Resistance (RJL) | 150 °C/W - enables predictable junction temperature rise during operation |
| ESD Rating | Class 3 (>16 kV HBM) - supports robust handling in automated assembly environments |
| Peak Surge Power | 225 W (8 × 20 μs) - allows single-event transient suppression without external TVS |
Pinout & Package
SOD-123 surface-mount plastic package (1.60 × 2.69 × 1.16 mm), void-free thermosetting case with cathode band marking. Designed for high-density layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased terminal during Zener operation |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential reference; completes bias path for breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and body electronics |
| Pb-Free Construction | RoHS-compliant packaging with no lead content, meeting global environmental compliance requirements |
| High ESD Robustness | Withstands >16 kV human-body-model discharge without parameter shift or failure |
| Optimized Thermal Path | Junction-to-lead resistance of 150 °C/W supports reliable operation up to +150 °C junction temperature |
| Stable Mid-Voltage Regulation | 18 V nominal Zener point selected for compatibility with 15 V and 24 V system rails |
Applications
| Automotive Sensor Reference | Industrial Power Supply Feedback |
|---|---|
Use Scenario: Providing stable 18 V reference for analog sensor signal conditioning in engine coolant temperature or pressure sensors. IC Role / Device Role / Timing Role: Voltage reference element in ratiometric measurement circuitry. Use Value: Maintains <±1% output accuracy over −40 °C to +125 °C ambient due to tight Zener tolerance and low TC drift. | Use Scenario: Regulating feedback voltage in isolated flyback or buck-derived auxiliary supplies for PLC I/O modules. IC Role / Device Role / Timing Role: Shunt regulator in optocoupler-coupled feedback loop. Use Value: Enables precise 18 V setpoint with 21 Ω ZZT to minimize load-induced error in 10–100 mA output ranges. |
| Consumer Audio Biasing | Medical Diagnostic Instrument Clamping |
Use Scenario: Generating clean bias voltage for op-amp input stages in portable audio DAC amplifiers. IC Role / Device Role / Timing Role: Low-noise DC reference source replacing larger electrolytic-based solutions. Use Value: Delivers 0.1 μA leakage at 14 V to preserve battery life in always-on audio subsystems. | Use Scenario: Overvoltage protection clamp on analog front-end inputs of portable ECG or pulse oximeter devices. IC Role / Device Role / Timing Role: Transient suppressor limiting input to 18.9 V max during ESD events. Use Value: Absorbs 225 W surges per IEC 61000-4-2 Level 4 without degradation, preserving signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5248ET1G | No AEC-Q101 qualification; same electrical specs and SOD-123 package | Not approved for automotive production; suitable for commercial-grade power supplies | Select when automotive qualification is not required and cost sensitivity is higher |
| BZX84-C18LT1G | 18 V ±5%, 350 mW rating, SOT-23 package, 40 Ω ZZT @ 5 mA | Lower power handling and higher impedance limit use in precision references | Choose for space-constrained designs where 500 mW derating margin is acceptable |
Compared with MMSZ5248ET1G and BZX84-C18LT1G, SZMMSZ5248ET1G offers automotive qualification and superior thermal performance (150 °C/W RJL vs. ~200 °C/W typical for SOT-23), making it preferred for under-hood or industrial environments requiring long-term reliability at elevated temperatures.
Availability
SZMMSZ5248ET1G is available at Aetrix Electronics and suitable for automotive sensor modules, industrial power supply feedback loops, and medical diagnostic instrument clamping circuits requiring stable component supply and AEC-Q101 compliance.
Supply support for SZMMSZ5248ET1G 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 and SiC solutions for automotive, industrial, cloud, and IoT applications.
SZMMSZ52xxET1G series is part of onsemi's automotive-qualified Zener regulator portfolio, designed specifically for voltage reference and overvoltage protection in harsh-environment electronic control units.
FAQ
What is the Zener voltage tolerance of SZMMSZ5248ET1G?
SZMMSZ5248ET1G has a Zener voltage tolerance of ±5% around its nominal 18 V rating, resulting in a guaranteed range of 17.1 V to 18.9 V at IZT = 7.0 mA and TL = 30 °C. This tolerance is confirmed in the Electrical Characteristics table on page 2 of the official onsemi datasheet for SZMMSZ5248ET1G.
Is SZMMSZ5248ET1G qualified for automotive applications?
Yes, SZMMSZ5248ET1G is AEC-Q101 qualified and PPAP capable, as explicitly stated in the Features section of the onsemi datasheet. The "SZ" prefix denotes compliance with automotive-specific site and process controls, making SZMMSZ5248ET1G suitable for engine control, body electronics, and ADAS subsystems.
What is the maximum power dissipation for SZMMSZ5248ET1G on a standard PCB?
SZMMSZ5248ET1G is rated for 500 mW total power dissipation on an FR-5 board at TL = 75 °C, with linear derating of 6.7 mW/°C above that temperature. This value is specified in the Maximum Ratings table and assumes the minimum recommended footprint per onsemi's layout guidelines.
Does SZMMSZ5248ET1G have Pb-free packaging?
Yes, SZMMSZ5248ET1G uses Pb-free packaging, as indicated by the "G" suffix and confirmed in the Ordering Information and Mechanical Characteristics sections of the datasheet. It complies with RoHS Directive 2011/65/EU and related global environmental regulations.
What is the reverse leakage current specification for SZMMSZ5248ET1G?
The reverse leakage current for SZMMSZ5248ET1G is 0.1 μA maximum at VR = 14 V, as listed in the Electrical Characteristics table. This low leakage supports energy-sensitive applications such as battery-powered instrumentation and always-on monitoring circuits.
SZMMSZ5248ET1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- SZMMSZ52xxxT1G
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 21 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 14 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
SZMMSZ5248ET1G FAQ
1.How can I place an order for SZMMSZ5248ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ5248ET1G 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 SZMMSZ5248ET1G reliable?
The price and inventory of SZMMSZ5248ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ5248ET1G is usually 5 days.
3.What payment methods are accepted for SZMMSZ5248ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ5248ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ5248ET1G?
SZMMSZ5248ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ5248ET1G 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 SZMMSZ5248ET1G?
For technical support, including SZMMSZ5248ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ5248ET1G requirements.
6.How does Aetrix verify that SZMMSZ5248ET1G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ5248ET1G 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 SZMMSZ5248ET1G meets industry standards.
7.What is the process for return or replacement of SZMMSZ5248ET1G?
All SZMMSZ5248ET1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ5248ET1G, 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 SZMMSZ5248ET1G part is unused and in its original packaging.
Return procedure for SZMMSZ5248ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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