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onsemi SZMMSZ5252ET1G
- Part No.:
- SZMMSZ5252ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ5252ET1G.pdf
- Description:
- DIODE ZENER 24V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:1,415
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Product details
Overview
SZMMSZ5252ET1G 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 reverse leakage at 18 V (VR). It serves as a precision voltage reference or overvoltage clamp in low-power analog and power management circuits.
For engineers reviewing the SZMMSZ5252ET1G 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 (Class 3, >16 kV HBM), and automotive qualification per AEC-Q101.
Technical Context
This device operates as a two-terminal, silicon planar Zener diode optimized for stable reverse-biased regulation. Its 24 V nominal Zener voltage is specified at IZT = 5.2 mA with ±5% tolerance, and it maintains regulation down to IZK = 0.25 mA where ZZK ≤ 600 Ω.
Designed for surface-mount assembly on FR-4/FR-5 PCBs, it features a cathode-band polarity indicator, UL 94 V-0 flammability rating, and Pb-free construction. Junction temperature range spans −55 °C to +150 °C, with peak surge capability of 225 W (8 × 20 µs pulse).
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 window 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 begins |
| Zener Impedance (ZZT) | 33 Ω max @ IZT = 5.2 mA - indicates voltage regulation stability under small-signal AC load variations |
| Reverse Leakage (IR) | 0.1 µA max @ VR = 18 V - ensures minimal standby current in clamping or reference applications |
| Thermal Resistance (RJL) | 150 °C/W junction-to-lead - enables accurate thermal modeling when mounted on copper pads with defined lead geometry |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - supports robust handling in automated assembly without external protection |
| Operating Temperature | −55 °C to +150 °C - validated for under-hood automotive, industrial control, and extended-environment use |
Pinout & Package
SZMMSZ5252ET1G is housed in a compact, surface-mount SOD-123 plastic package (1.60 × 2.69 × 1.16 mm), with void-free thermosetting case, corrosion-resistant finish, and UL 94 V-0 flammability rating. Cathode is marked by a band on the case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-bias terminal where Zener breakdown occurs |
| 2 (Non-banded End) | Anode | Connected to circuit ground or lower-potential rail; completes bias path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and body electronics requiring PPAP compliance |
| 500 mW Power Rating | Enables use in medium-current reference and transient suppression without heatsinking on standard PCBs |
| Low Dynamic Impedance | 33 Ω at 5.2 mA ensures <±0.1 V output variation across typical load current shifts in feedback networks |
| Pb-Free & RoHS Compliant | Meets global environmental regulations and supports lead-free reflow soldering up to 260 °C for 10 seconds |
| High ESD Robustness | Class 3 HBM (>16 kV) eliminates need for external ESD protection in many interface and sensor signal conditioning designs |
Applications
| Automotive Engine Control Unit (ECU) Reference | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Providing stable 24 V reference for ADC biasing and microcontroller reset supervision in engine control modules. IC Role / Device Role / Timing Role: Voltage reference and overvoltage clamp protecting analog front-end inputs from battery transients. Use Value: Maintains ±5% regulation across −40 °C to +125 °C ambient, enabling reliable operation without calibration drift. | Use Scenario: Stabilizing excitation voltage for 4–20 mA current-loop pressure and temperature transmitters. IC Role / Device Role / Timing Role: Precision shunt regulator ensuring constant sensor supply despite varying loop voltage (12–36 V). Use Value: Low 0.1 µA leakage at 18 V prevents loading error in high-impedance sensor bridges and amplifiers. |
| USB-C Power Delivery Clamp | Programmable Logic Controller (PLC) Input Protection |
Use Scenario: Clamping transient surges on USB-C VBUS lines during hot-plug events or ESD discharge. IC Role / Device Role / Timing Role: Fast-response shunt protector absorbing 225 W non-repetitive pulses (8 × 20 µs) without failure. Use Value: Peak surge rating exceeds IEC 61000-4-5 Level 4 requirements, eliminating need for additional TVS stages. | Use Scenario: Protecting 24 V digital input channels in PLC backplanes from field-wiring induced transients. IC Role / Device Role / Timing Role: Primary overvoltage limiter placed before optocoupler input circuitry. Use Value: SOD-123 footprint allows dense placement near connectors while maintaining AEC-Q101 reliability for industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5252ET1G | No SZ prefix; not AEC-Q101 qualified; same electrical specs and SOD-123 package | Intended for commercial/industrial use only; lacks automotive change control and PPAP documentation | Select when automotive qualification is unnecessary and cost sensitivity is higher |
| BZX84-C24LT1G | 24 V ±5%, 350 mW rating, SOT-23 package, 80 Ω ZZT @ 5 mA - lower power and higher impedance | Used in space-constrained portable electronics; less suitable for sustained 24 V regulation under load | Choose only for low-power, low-cost consumer applications where thermal margin is ample |
Compared with MMSZ5252ET1G and BZX84-C24LT1G, SZMMSZ5252ET1G uniquely combines automotive qualification, 500 mW power handling, and 33 Ω low-impedance regulation-making it the preferred choice for mission-critical 24 V reference and clamp functions in harsh environments.
Availability
SZMMSZ5252ET1G is available at Aetrix Electronics and suitable for automotive engine control units, industrial sensor interfaces, and programmable logic controller input protection requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SZMMSZ5252ET1G 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.
SZMMSZ5252ET1G belongs to the SZMMSZ52xxET1G series of AEC-Q101-qualified Zener diodes designed specifically for automotive and high-reliability industrial voltage regulation and transient suppression.
FAQ
What is the Zener voltage tolerance of SZMMSZ5252ET1G?
SZMMSZ5252ET1G 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 TL = 30 °C ±1 °C. This tolerance is confirmed in the Electrical Characteristics table on page 2 of the official onsemi datasheet.
Is SZMMSZ5252ET1G suitable for automotive applications?
Yes, SZMMSZ5252ET1G is AEC-Q101 qualified and PPAP capable, with the "SZ" prefix indicating compliance for automotive and other applications requiring unique site and control change requirements. Its operating temperature range (−55 °C to +150 °C) and robust ESD rating (>16 kV HBM) further support under-hood and chassis-mounted use.
What is the maximum power dissipation for SZMMSZ5252ET1G on a standard PCB?
SZMMSZ5252ET1G 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 rating assumes the minimum recommended footprint per onsemi's packaging specification and is validated per JEDEC standards.
How does the dynamic impedance of SZMMSZ5252ET1G affect voltage regulation accuracy?
SZMMSZ5252ET1G exhibits a maximum dynamic impedance (ZZT) of 33 Ω at IZT = 5.2 mA, meaning a 1 mA change in Zener current causes ≤33 mV shift in regulated voltage. This low impedance ensures tight regulation in feedback loops and reference circuits where load-induced current variation must be minimized.
What package type and marking does SZMMSZ5252ET1G use?
SZMMSZ5252ET1G uses the SOD-123 surface-mount package (1.60 × 2.69 × 1.16 mm) with cathode indicated by a band. Its marking code is "CD5", followed by a date code and Pb-free indicator ("G" or microdot), as shown in the Device Marking Information section of the onsemi datasheet.
SZMMSZ5252ET1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- SZMMSZ52xxxT1G
- 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
SZMMSZ5252ET1G FAQ
1.How can I place an order for SZMMSZ5252ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ5252ET1G 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 SZMMSZ5252ET1G reliable?
The price and inventory of SZMMSZ5252ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ5252ET1G is usually 5 days.
3.What payment methods are accepted for SZMMSZ5252ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ5252ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ5252ET1G?
SZMMSZ5252ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ5252ET1G 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 SZMMSZ5252ET1G?
For technical support, including SZMMSZ5252ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ5252ET1G requirements.
6.How does Aetrix verify that SZMMSZ5252ET1G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ5252ET1G 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 SZMMSZ5252ET1G meets industry standards.
7.What is the process for return or replacement of SZMMSZ5252ET1G?
All SZMMSZ5252ET1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ5252ET1G, 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 SZMMSZ5252ET1G part is unused and in its original packaging.
Return procedure for SZMMSZ5252ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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