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onsemi SZMMSZ5252ET3G
- Part No.:
- SZMMSZ5252ET3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ5252ET3G.pdf
- Description:
- DIODE ZENER 24V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:9,942
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Product details
Overview
SZMMSZ5252ET3G from onsemi is a 24 V ±5% Zener diode in SOD-123 package, rated for 500 mW power dissipation at 75 °C on FR-5 board, with 5.2 mA test current (IZT), 33 Ω dynamic impedance (ZZT), and 0.1 µA leakage current at 18 V reverse bias - used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the SZMMSZ5252ET3G 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 SOD-123 footprint compatibility in space-constrained PCB layouts.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to maintain stable voltage across its terminals under varying load or supply conditions. It exhibits a nominal temperature coefficient near +0.095 %/°C for the 24 V variant, with steady-state power derating beginning above 75 °C ambient.
The SOD-123 package enables automated placement and reflow soldering, with cathode polarity marked by a band. Its 150 °C/W junction-to-lead thermal resistance supports localized heat transfer to PCB copper, while peak surge capability reaches 225 W for 8 × 20 µs pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8 V min / 24 V nom / 25.2 V max @ IZT = 5.2 mA - defines regulated output voltage range under standard test conditions |
| Power Dissipation (PD) | 500 mW @ TL = 75 °C on FR-5 board - sets maximum continuous DC power handling before thermal derating |
| Zener Impedance (ZZT) | 33 Ω max @ IZT = 5.2 mA - determines voltage regulation stability under small-signal AC load variations |
| Leakage Current (IR) | 0.1 µA max @ VR = 18 V - ensures minimal parasitic current draw below breakdown threshold |
| ESD Rating | Class 3 (>16 kV) per HBM - guarantees robustness against electrostatic discharge during handling and assembly |
| Junction-to-Lead RθJL | 150 °C/W - enables thermal modeling of local PCB trace heating and solder joint temperature rise |
Pinout & Package
SOD-123 surface-mount plastic package (1.60 × 2.69 × 1.16 mm), void-free thermosetting case with corrosion-resistant finish; cathode indicated by polarity band; lead-free (Pb-free) construction compliant with RoHS.
| 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 rail; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and body electronics requiring high reliability |
| Small Outline Package | SOD-123 footprint allows high-density routing in compact consumer and industrial PCBs without sacrificing thermal performance |
| High Surge Withstand | 225 W nonrepetitive peak power rating supports transient overvoltage protection in noisy environments |
| Pb-Free Construction | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 24 V reference for feedback loop in isolated DC-DC converter secondary side. IC Role / Device Role / Timing Role: Voltage reference element defining output regulation setpoint via optocoupler feedback network. Use Value: Tight ±5% VZ tolerance and low ZZT ensure <±1% output voltage accuracy across line/load/temperature. | Use Scenario: Protecting microcontroller GPIO pins from 24 V field wiring transients in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Shunt clamp limiting voltage excursion to ≤25.2 V during ESD or inductive kick events. Use Value: 225 W surge rating and 16 kV HBM ESD immunity enable direct interface without external series resistance. |
| Temperature Sensor Bias | ADC Reference Stabilization |
Use Scenario: Biasing silicon bandgap temperature sensor ICs requiring precise 24 V excitation in HVAC thermostats. IC Role / Device Role / Timing Role: Stable voltage source ensuring linear sensor response independent of supply ripple. Use Value: Low 0.1 µA leakage at 18 V prevents loading error in high-impedance sensor bias networks. | Use Scenario: Stabilizing reference input to 12-bit SAR ADC in battery-powered data loggers. IC Role / Device Role / Timing Role: Low-noise voltage reference suppressing supply-induced quantization error. Use Value: 33 Ω ZZT minimizes AC impedance-induced reference droop during ADC sampling bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5252ET1G | No AEC-Q101 qualification; identical electrical specs and SOD-123 package | Not approved for automotive use; suitable for commercial-grade power supplies and consumer electronics | Select when automotive qualification is unnecessary and cost sensitivity is higher |
| BZX84-C24LT1G | 24 V ±5%, 300 mW rating, SOT-23 package, 60 Ω ZZT, 100 nA leakage @ 18 V | Lower power rating and higher impedance limit use in precision references or high-current clamping | Select when board space permits SOT-23 and thermal budget allows reduced power handling |
Compared with MMSZ5252ET1G, SZMMSZ5252ET3G adds AEC-Q101 compliance and PPAP capability for automotive systems, while BZX84-C24LT1G trades power and impedance performance for smaller footprint - choice depends on qualification requirements, thermal constraints, and layout density.
Availability
SZMMSZ5252ET3G is available at Aetrix Electronics and suitable for automotive control units, industrial sensor interfaces, and portable instrumentation requiring stable component supply with AEC-Q101 validation and Pb-free compliance.
Supply support for SZMMSZ5252ET3G 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
SZMMSZ52xxET1G series targets high-reliability voltage regulation in harsh environments, with design emphasis on AEC-Q101 qualification, robust surge handling, and consistent parametric performance across temperature extremes.
FAQ
What is the Zener voltage tolerance for SZMMSZ5252ET3G?
The SZMMSZ5252ET3G has a nominal Zener voltage of 24 V with a standard tolerance of ±5%, resulting in a guaranteed range of 22.8 V to 25.2 V when measured at IZT = 5.2 mA and thermal equilibrium at 30 °C. This tolerance is specified per onsemi's datasheet revision 10 and applies across the full operating temperature range of −55 °C to +150 °C.
Is SZMMSZ5252ET3G suitable for automotive applications?
Yes, SZMMSZ5252ET3G is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. The "SZ" prefix explicitly denotes compliance with automotive-specific site and process controls, and its 16 kV HBM ESD rating exceeds typical automotive ESD requirements.
What is the maximum continuous power dissipation for SZMMSZ5252ET3G?
SZMMSZ5252ET3G 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. Its junction-to-ambient thermal resistance is 340 °C/W, and junction-to-lead is 150 °C/W - both critical for thermal design in enclosed or high-ambient environments.
How does the SOD-123 package affect PCB layout for SZMMSZ5252ET3G?
The SOD-123 package (1.60 × 2.69 × 1.16 mm) requires a standardized footprint matching onsemi's CASE 425 outline, with cathode identified by a band. Its small size supports high-density routing, but thermal relief to copper pour must be optimized using the recommended minimum footprint (3.5 × 1.5 inches FR-5 board) to sustain 500 mW operation without exceeding TJ limits.
What is the leakage current specification for SZMMSZ5252ET3G at 18 V reverse bias?
SZMMSZ5252ET3G specifies a maximum reverse leakage current (IR) of 0.1 µA at VR = 18 V and TA = 25 °C. This low leakage ensures minimal loading error in high-impedance reference or bias networks, such as those used with precision op-amps or temperature sensors, and remains stable across the full −55 °C to +150 °C operating range.
SZMMSZ5252ET3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 33 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 18 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
SZMMSZ5252ET3G FAQ
1.How can I place an order for SZMMSZ5252ET3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ5252ET3G 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 SZMMSZ5252ET3G reliable?
The price and inventory of SZMMSZ5252ET3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ5252ET3G is usually 5 days.
3.What payment methods are accepted for SZMMSZ5252ET3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ5252ET3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ5252ET3G?
SZMMSZ5252ET3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ5252ET3G 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 SZMMSZ5252ET3G?
For technical support, including SZMMSZ5252ET3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ5252ET3G requirements.
6.How does Aetrix verify that SZMMSZ5252ET3G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ5252ET3G 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 SZMMSZ5252ET3G meets industry standards.
7.What is the process for return or replacement of SZMMSZ5252ET3G?
All SZMMSZ5252ET3G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ5252ET3G, 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 SZMMSZ5252ET3G part is unused and in its original packaging.
Return procedure for SZMMSZ5252ET3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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