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onsemi SZMMSZ5252BT1
- Part No.:
- SZMMSZ5252BT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ5252BT1.pdf
- Description:
- DIODE ZENER 24V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:21,000
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Product details
Overview
SZMMSZ5252BT1 from onsemi is a 24 V ±5% Zener voltage regulator diode in SOD−123 package, rated for 500 mW power dissipation at TL = 75°C, 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 sensor interfaces and automotive body control modules.
For engineers reviewing the SZMMSZ5252BT1 datasheet, pinout, applications, or equivalent options, key selection criteria include its 24 V nominal Zener voltage, ±5% tolerance, thermal equilibrium characterization, AEC−Q101 qualification, and Pb−free SOD−123 surface-mount construction.
Technical Context
This device operates as a two-terminal silicon Zener diode, conducting in reverse bias above its specified breakdown voltage to maintain stable voltage regulation. Its electrical behavior is defined under thermal equilibrium conditions (TL = 30°C ±1°C), with Zener voltage measured at IZT = 5.2 mA and dynamic impedance characterized at 1 kHz AC signal superimposed on DC bias.
The SZMMSZ5252BT1 exhibits a temperature coefficient of +11.5 mV/°C (typical) across −55°C to +150°C, enabling predictable voltage drift compensation in automotive environments. Its ESD rating exceeds 16 kV (HBM Class 3), and it meets UL 94 V−0 flammability requirements for high-reliability PCB assemblies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8–25.2 V @ IZT = 5.2 mA - defines regulated output voltage range under standard test conditions |
| Power Dissipation (PD) | 500 mW @ TL = 75°C - maximum continuous power handling on FR−5 board before derating |
| Zener Impedance (ZZT) | 600 Ω max @ IZT = 5.2 mA - indicates voltage stability under small-signal AC variation |
| Reverse Leakage (IR) | 0.1 µA max @ VR = 18 V - ensures minimal standby current in clamping applications |
| Junction Temp Range | −55°C to +150°C - supports operation in under-hood automotive and industrial environments |
| ESD Rating | Class 3 (>16 kV HBM) - provides robust protection against electrostatic discharge during handling and assembly |
| Tolerance | ±5% - specifies allowable deviation from nominal 24 V Zener voltage at thermal equilibrium |
Pinout & Package
Package: SOD−123 (Case 425), surface-mount plastic case with cathode band marking; dimensions: 2.54–2.84 mm length × 1.40–1.80 mm width × 0.94–1.35 mm height; RoHS-compliant, Pb−free, UL 94 V−0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Reverse-bias anode connection point | Connected to higher-potential node in Zener regulation; polarity band identifies this terminal |
| 2 (Anode) | Reverse-bias cathode connection point | Connected to lower-potential node (e.g., ground or return path); completes reverse conduction path |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 Qualified | Validated for automotive electronics use with PPAP capability and controlled manufacturing site requirements |
| Thermal Equilibrium Spec | Zener voltage guaranteed only when device junction reaches thermal equilibrium at TL = 30°C ±1°C |
| High-Density Mounting | SOD−123 footprint enables compact layout in space-constrained PCBs such as ECUs and sensor nodes |
| Automotive-Grade Marking | SZ prefix denotes compliance with automotive-specific change control and traceability protocols |
| FR−4/FR−5 Rated | 500 mW power rating confirmed on standard PCB materials without heatsinking or thermal vias |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage reference for microcontroller ADC inputs monitoring 12 V battery rail in door module ECUs. IC Role / Device Role / Timing Role: Two-terminal Zener regulator providing stable 24 V reference for analog front-end scaling. Use Value: Enables accurate battery state-of-charge measurement despite wide ambient temperature swings (−40°C to +125°C). | Use Scenario: Overvoltage clamp protecting 24 V supply rail of pressure transducer interface circuitry. IC Role / Device Role / Timing Role: Reverse-biased shunt element limiting transient excursions beyond 25.2 V. Use Value: Prevents damage to downstream op-amps and ADCs during load-dump events per ISO 7637-2 Pulse 5a. |
| Consumer IoT Power Management | Medical Diagnostic Equipment Reference |
Use Scenario: Low-power voltage reference in battery-operated smart thermostat auxiliary supply. IC Role / Device Role / Timing Role: Precision Zener establishing 24 V reference for isolated DC-DC feedback loop. Use Value: Maintains ±0.5% regulation accuracy over 10-year product lifetime due to low IR and stable TC. | Use Scenario: Calibration reference in portable ultrasound device power subsystem. IC Role / Device Role / Timing Role: Stable 24 V node used to verify DAC output linearity during self-test routines. Use Value: Supports Class II medical device compliance via AEC−Q101 qualification and traceable Pb−free sourcing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5252BT1G | Same electrical specs, but lacks SZ prefix; not AEC−Q101 qualified or PPAP capable | Restricted to commercial-grade applications; unsuitable for automotive production | Select only for non-automotive designs where cost sensitivity outweighs qualification requirements |
| BZX84-C24 | 24 V ±5%, SOT−23 package, 300 mW rating, 60 Ω ZZT - lower power and impedance than SZMMSZ5252BT1 | Used in consumer wearables and portable instruments where board space > power density | Choose when lower thermal mass or existing SOT−23 footprint is prioritized over automotive reliability |
Compared with MMSZ5252BT1G and BZX84-C24, the SZMMSZ5252BT1 delivers automotive-grade reliability (AEC−Q101), higher power handling (500 mW vs. 300 mW), and tighter thermal characterization-making it the sole option for safety-critical 24 V regulation in OEM vehicle systems.
Availability
SZMMSZ5252BT1 is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, consumer IoT power management, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SZMMSZ5252BT1 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 (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The SZMMSZ52xxxT1G series is designed specifically for automotive and high-reliability industrial applications requiring AEC−Q101 qualification, thermal equilibrium voltage specification, and Pb−free SOD−123 packaging.
FAQ
What is the nominal Zener voltage and tolerance of SZMMSZ5252BT1?
The SZMMSZ5252BT1 has a nominal Zener voltage of 24 V with a ±5% tolerance, meaning its actual breakdown voltage falls between 22.8 V and 25.2 V when measured at IZT = 5.2 mA under thermal equilibrium conditions (TL = 30°C ±1°C). This tolerance is confirmed in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table on page 3 of the official datasheet.
Is SZMMSZ5252BT1 qualified for automotive applications?
Yes, SZMMSZ5252BT1 is AEC−Q101 qualified and PPAP capable, as explicitly stated in the "Features" section of the datasheet. The "SZ" prefix denotes compliance with automotive-specific site and change control requirements, distinguishing it from commercial-grade variants like MMSZ5252BT1G.
What is the maximum power dissipation rating for SZMMSZ5252BT1?
The SZMMSZ5252BT1 is rated for 500 mW total power dissipation on FR−5 board at TL = 75°C, with a derating factor of 6.7 mW/°C above that temperature. This rating assumes use of the minimum recommended SOD−123 footprint and is validated per infrared scan methodology per Note 2 in the Maximum Ratings table.
Does SZMMSZ5252BT1 have ESD protection, and what level is specified?
Yes, SZMMSZ5252BT1 features an ESD rating of Class 3 (>16 kV) per the Human Body Model (HBM), as listed in the "Features" section. This level of robustness supports automated handling and assembly in high-volume manufacturing environments without additional ESD mitigation.
What package type and marking does SZMMSZ5252BT1 use?
SZMMSZ5252BT1 uses the SOD−123 surface-mount plastic package (Case 425, Style 1), with cathode identified by a polarity band. Per the "DEVICE MARKING INFORMATION" section, its marking code is "K2", visible on the top surface of the device body.
SZMMSZ5252BT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Bulk
- 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
SZMMSZ5252BT1 FAQ
1.How can I place an order for SZMMSZ5252BT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ5252BT1 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 SZMMSZ5252BT1 reliable?
The price and inventory of SZMMSZ5252BT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ5252BT1 is usually 5 days.
3.What payment methods are accepted for SZMMSZ5252BT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ5252BT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ5252BT1?
SZMMSZ5252BT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ5252BT1 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 SZMMSZ5252BT1?
For technical support, including SZMMSZ5252BT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ5252BT1 requirements.
6.How does Aetrix verify that SZMMSZ5252BT1 is sourced from the original manufacturer or authorized distributors?
All SZMMSZ5252BT1 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 SZMMSZ5252BT1 meets industry standards.
7.What is the process for return or replacement of SZMMSZ5252BT1?
All SZMMSZ5252BT1 units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ5252BT1, 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 SZMMSZ5252BT1 part is unused and in its original packaging.
Return procedure for SZMMSZ5252BT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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