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onsemi MMSZ5252BT3G
- Part No.:
- MMSZ5252BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5252BT3G.pdf
- Description:
- DIODE ZENER 24V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,033
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Product details
Overview
MMSZ5252BT3G from onsemi is a 24 V ±5% Zener 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 sensing and power supply feedback loops.
For engineers reviewing the MMSZ5252BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include its 24 V nominal Zener voltage, ±5% tolerance, 33 Ω impedance at 5.2 mA, thermal equilibrium characterization, and Pb−Free SOD−123 surface-mount compatibility with automated assembly.
Technical Context
This device operates as a two-terminal silicon Zener regulator with junction temperature range −55°C to +150°C and thermal resistance RJA = 340°C/W. Its Zener voltage is specified under thermal equilibrium conditions at TL = 30°C ±1°C, ensuring stable reference behavior in thermally constrained PCB layouts.
The MMSZ5252BT3G exhibits a typical temperature coefficient of +11.5 mV/°C near 24 V and maintains ≤0.1 µA leakage at VR = 18 V, supporting low-quiescent-current designs. Its ESD rating exceeds 16 kV (HBM Class 3) and it complies with AEC−Q101 for automotive applications when ordered with SZ prefix.
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 tight regulation window for 24 V rail monitoring |
| Power Dissipation (PD) | 500 mW on FR−5 board @ TL = 75°C - sets maximum continuous power handling in standard PCB thermal conditions |
| Zener Impedance (ZZT) | 33 Ω max @ IZT = 5.2 mA - determines AC voltage variation under load transients |
| Reverse Leakage (IR) | 0.1 µA max @ VR = 18 V - ensures minimal error current in high-impedance reference nodes |
| Thermal Resistance (RJA) | 340°C/W - quantifies junction-to-ambient temperature rise per watt, critical for thermal derating above 75°C |
| ESD Rating | Class 3 (>16 kV HBM) - supports robustness in handling and board-level ESD events without protection circuitry |
| Package | SOD−123 (Case 425) - enables 1.8 mm × 1.2 mm footprint for high-density PCBs with automated placement |
Pinout & Package
SOD−123 plastic surface-mount package with cathode indicated by polarity band; void-free transfer-molded thermosetting case, UL 94 V−0 flammability rating, and 260°C soldering tolerance for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener anode connection point | Connected to regulated voltage node; polarity band identifies this terminal for correct orientation during placement |
| 2 (Anode) | Zener cathode connection point | Typically tied to ground or lower potential; reverse-biased operation requires anode at lower voltage than cathode |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables use in medium-current reference and clamping circuits without external heat sinking on standard FR−5 boards |
| ±5% Zener Tolerance | Provides predictable 24 V regulation window (22.8–25.2 V) suitable for non-critical voltage supervision and analog scaling |
| Thermal Equilibrium Specification | Ensures Zener voltage accuracy is validated under stabilized thermal conditions, improving repeatability across production batches |
| Pb−Free & AEC−Q101 Capable | Supports automotive qualification pathways and RoHS-compliant manufacturing without lead-based solder concerns |
| Small SOD−123 Footprint | Reduces PCB area by >50% vs. legacy DO−35 packages, enabling compact sensor modules and portable power supplies |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Monitoring |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADC inputs in temperature/humidity transmitters operating from 3.3 V or 5 V rails. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing stable 24 V reference for op-amp gain-setting networks and sensor excitation. Use Value: Maintains <±1% reference drift over −40°C to +85°C ambient due to known +11.5 mV/°C TC and low 0.1 µA leakage. | Use Scenario: Clamping overvoltage on CC line detection circuitry in USB-C port controllers during hot-plug events. IC Role / Device Role / Timing Role: Fast-acting transient suppressor limiting CC line voltage to safe levels before controller GPIO damage occurs. Use Value: Responds within nanoseconds to surges up to 100 W (1 ms pulse) while adding <0.5 pF capacitance to preserve signal integrity. |
| Automotive Cabin Control Panel | IoT Node Battery Management |
Use Scenario: Regulating 24 V supply for microcontroller I/O protection circuitry in HVAC control modules exposed to load-dump transients. IC Role / Device Role / Timing Role: Shunt regulator absorbing excess energy during ISO 7637-2 Pulse 5a events, protecting downstream logic. Use Value: Withstands 16 kV HBM ESD and operates reliably from −40°C to +125°C junction temperature per AEC−Q101 requirements. | Use Scenario: Providing precise undervoltage lockout threshold for Li-ion battery protection ICs in smart home sensors. IC Role / Device Role / Timing Role: Voltage threshold detector setting 2.4 V cutoff point via resistor divider with MMSZ5252BT3G as stable reference. Use Value: Delivers consistent 24 V reference despite battery voltage sag, enabling accurate 2.5% UVLO hysteresis without trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C24LT1G | Same 24 V ±5%, but SOT−23 package (higher RJA = 375°C/W); 600 mW rating on FR−4 only | Less thermal margin in high-density layouts; requires larger copper pour for equivalent power handling | Select when SOT−23 footprint is already standardized and thermal derating is acceptable |
| MMSZ4702T1G | 24 V ±5%, but 350 mW rating and higher ZZT (45 Ω); not AEC−Q101 qualified | Lower power capability limits use in sustained clamp applications; no automotive qualification path | Select for cost-sensitive consumer electronics where AEC−Q101 and 500 mW are not required |
Compared with BZX84-C24LT1G and MMSZ4702T1G, the MMSZ5252BT3G offers superior thermal performance (340°C/W), guaranteed 500 mW dissipation on FR−5, and AEC−Q101 qualification-making it preferred for automotive and industrial designs requiring long-term reliability under thermal stress.
Availability
MMSZ5252BT3G is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB-C power delivery monitoring, automotive cabin control panels, and IoT node battery management requiring stable component supply and automotive-grade traceability.
Supply support for MMSZ5252BT3G 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 specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MMSZ52xxxT1G series is designed for general-purpose, medium-current Zener regulation in space-constrained surface-mount applications-emphasizing thermal stability, Pb−Free compliance, and high-volume manufacturability.
FAQ
What is the Zener voltage tolerance of the MMSZ5252BT3G?
The MMSZ5252BT3G has a ±5% tolerance on its nominal 24 V Zener voltage, meaning the actual measured VZ falls between 22.8 V and 25.2 V when tested at IZT = 5.2 mA under thermal equilibrium conditions. This tolerance is confirmed in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table on page 3 of the official datasheet, and applies specifically to the "B" suffix variant like MMSZ5252BT3G.
Does the MMSZ5252BT3G meet automotive qualification standards?
Yes-the MMSZ5252BT3G is AEC−Q101 qualified and PPAP capable when ordered with the SZ prefix (e.g., SZMMSZ5252BT3G). While the base MMSZ5252BT3G part itself is not automatically qualified, the datasheet explicitly states that "SZ Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC−Q101 Qualified and PPAP Capable", confirming the qualification pathway exists for automotive use cases.
What is the maximum reverse leakage current for MMSZ5252BT3G at 18 V?
The maximum reverse leakage current (IR) for MMSZ5252BT3G is 0.1 µA at VR = 18 V, as specified in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table on page 3. This low leakage ensures minimal error current in high-impedance reference divider networks and supports accurate voltage sensing in battery-powered IoT nodes.
Can MMSZ5252BT3G be used in place of MMSZ5252BT1G?
Yes-MMSZ5252BT3G and MMSZ5252BT1G share identical electrical specifications, thermal ratings, and SOD−123 packaging; the only difference is packaging quantity (10,000 vs. 3,000 per tape-and-reel). Both are Pb−Free, have the same marking ("K2"), and meet all parameters in the datasheet. No design or layout changes are needed when substituting MMSZ5252BT3G for MMSZ5252BT1G.
What is the thermal resistance junction-to-ambient (RJA) for MMSZ5252BT3G?
The thermal resistance junction-to-ambient (RJA) for MMSZ5252BT3G is 340°C/W, measured via infrared scan method on FR−5 board per Note 2 in the "MAXIMUM RATINGS" table. This value governs thermal derating above 75°C ambient and must be used to calculate allowable power dissipation in real-world PCB layouts.
MMSZ5252BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5252BT3G FAQ
1.How can I place an order for MMSZ5252BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5252BT3G 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 MMSZ5252BT3G reliable?
The price and inventory of MMSZ5252BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5252BT3G is usually 5 days.
3.What payment methods are accepted for MMSZ5252BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5252BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5252BT3G?
MMSZ5252BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5252BT3G 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 MMSZ5252BT3G?
For technical support, including MMSZ5252BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5252BT3G requirements.
6.How does Aetrix verify that MMSZ5252BT3G is sourced from the original manufacturer or authorized distributors?
All MMSZ5252BT3G 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 MMSZ5252BT3G meets industry standards.
7.What is the process for return or replacement of MMSZ5252BT3G?
All MMSZ5252BT3G units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5252BT3G, 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 MMSZ5252BT3G part is unused and in its original packaging.
Return procedure for MMSZ5252BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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