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onsemi MMSZ5252BT1
- Part No.:
- MMSZ5252BT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5252BT1.pdf
- Description:
- DIODE ZENER 24V 500MW SOD-123
- Quantity:
- Payment:
- Shipping:
Inventory:7,557
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Product details
Overview
MMSZ5252BT1 from onsemi is a 24 V ±5% Zener diode in SOD−123 surface-mount package, rated for 500 mW power dissipation at 75°C ambient, 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 signal conditioning circuits.
For engineers reviewing the MMSZ5252BT1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, cathode/anode terminal roles, SOD−123 mechanical dimensions, and direct alternative options for voltage regulation in space-constrained PCBs.
Technical Context
This device operates in reverse-biased Zener breakdown mode with junction temperature stabilized at TL = 30°C ±1°C during VZ measurement. Its 24 V nominal Zener voltage exhibits a positive temperature coefficient above 5 V, confirmed by typical TC curves in Figure 1 of the datasheet.
The 500 mW rating applies to FR−5 board with minimum footprint; derating begins at 6.7 mW/°C above 75°C ambient. Thermal resistance from junction-to-lead is 150 °C/W, enabling reliable operation up to +150°C junction temperature.
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 stable regulation window under thermal equilibrium |
| Power Dissipation (PD) | 500 mW @ TL = 75°C - sets maximum continuous DC power on standard FR−5 PCB |
| Zener Impedance (ZZT) | 600 Ω max @ IZK = 0.25 mA; 33 Ω @ IZT = 5.2 mA - determines output voltage stability under load variation |
| Reverse Leakage (IR) | 0.1 µA max @ VR = 18 V - ensures minimal quiescent current in standby voltage-sense circuits |
| Junction Temp Range | −55°C to +150°C - supports industrial and automotive under-hood applications without derating |
| ESD Rating | Class 3 (>16 kV HBM) - eliminates need for external ESD protection in I/O line clamping |
| Package | SOD−123 (1.60 × 2.69 × 1.16 mm) - enables high-density placement in portable and IoT edge devices |
Pinout & Package
SOD−123 two-terminal surface-mount package with molded thermosetting plastic case, cathode indicated by polarity band. Maximum soldering temperature is 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; reverse-bias voltage applied here to initiate Zener conduction |
| 2 (Non-banded End) | Anode | Connected to circuit ground or lower-potential rail; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Supports sustained regulation in 3.3 V–24 V auxiliary rails without heatsinking on standard PCBs |
| ±5% Zener Tolerance | Enables predictable voltage threshold setting in comparator reference and feedback divider networks |
| Class 3 ESD Robustness | Withstands >16 kV human-body-model discharge, simplifying ESD design for exposed I/O lines |
| Pb-Free Construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 |
| Thermal Equilibrium VZ Spec | Guarantees 24 V regulation accuracy under steady-state thermal conditions, not transient pulses |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Clamp |
|---|---|
|
Use Scenario: Stabilizing reference voltage for 24 V industrial pressure transducers operating in −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Zener diode provides fixed 24 V reference for op-amp biasing and ADC input scaling. Use Value: Tight 5% tolerance and −55°C to +150°C junction range ensure calibration stability across temperature extremes. |
Use Scenario: Clamping overvoltage transients on USB-C CC lines during hot-plug events. IC Role / Device Role / Timing Role: Fast-response Zener shunts surge energy before it reaches USB PD controller ICs. Use Value: 0.1 µA leakage at 18 V prevents false detection while 33 Ω ZZT limits clamping voltage overshoot. |
| Automotive Cabin Control Panel | IoT Node Battery Monitor |
|
Use Scenario: Regulating 24 V supply rail for touch-button microcontroller in vehicle HVAC interface. IC Role / Device Role / Timing Role: Zener maintains clean 24 V reference for MCU ADC measuring potentiometer position. Use Value: AEC−Q101 qualification and 150 °C max junction temperature support under-dash deployment. |
Use Scenario: Providing stable 24 V reference for lithium-ion battery cell voltage monitoring in smart metering nodes. IC Role / Device Role / Timing Role: Zener establishes known voltage threshold for low-power comparator detecting end-of-charge condition. Use Value: 500 mW rating allows direct connection to 24 V battery string without series resistor in low-current sensing paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C24 | 24 V ±5%, 300 mW rating, SOD-323 package (1.3 × 1.7 × 1.1 mm) | Lower power handling requires series resistor in >10 mA loads; smaller footprint saves area but reduces thermal mass | Select when board space is critical and peak current stays below 12 mA |
| MMSZ5252CT1G | 24 V ±2%, identical 500 mW rating and SOD−123 package | Tighter tolerance improves reference accuracy in precision feedback loops but increases cost | Select when voltage threshold repeatability must be within ±0.48 V across production lots |
Compared with MMSZ5252BT1, BZX584C24 trades thermal robustness for miniaturization, while MMSZ5252CT1G delivers higher regulation precision at no package or layout change-making it a drop-in upgrade where accuracy outweighs cost sensitivity.
Availability
MMSZ5252BT1 is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB-C protection circuits, automotive cabin controls, and IoT battery monitors requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MMSZ5252BT1 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMSZ52xxxT1G series was designed specifically for surface-mount voltage regulation in space-constrained, medium-current applications where reliability, thermal stability, and Pb-free compliance are mandatory.
FAQ
What is the Zener voltage tolerance for MMSZ5252BT1?
The MMSZ5252BT1 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 and thermal equilibrium (TL = 30°C ±1°C). This tolerance is confirmed in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table on page 3 of the official onsemi datasheet for MMSZ5252BT1.
Can MMSZ5252BT1 be used in automotive applications?
Yes, the MMSZ5252BT1 is qualified to AEC−Q101 standards and PPAP capable when ordered with the SZ prefix (e.g., SZMMSZ5252BT1G), confirming suitability for automotive cabin control modules, body electronics, and under-hood sensors. The base MMSZ5252BT1 meets all electrical and thermal specs required for non-safety-critical automotive use, including operation from −55°C to +150°C junction temperature.
What is the maximum reverse leakage current for MMSZ5252BT1?
The maximum reverse leakage current (IR) for MMSZ5252BT1 is 0.1 µA at VR = 18 V and TA = 25°C, as specified in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table. This low leakage ensures minimal power loss in always-on voltage-monitoring circuits and preserves battery life in low-duty-cycle IoT nodes using MMSZ5252BT1 as a reference.
How does thermal derating affect MMSZ5252BT1's power capability?
MMSZ5252BT1 is rated for 500 mW at TL = 75°C; above that ambient temperature, power must be reduced by 6.7 mW per °C, per the "MAXIMUM RATINGS" table. At 105°C board temperature, its usable power drops to 283 mW. This linear derating curve is validated in Figure 3 ("Steady State Power Derating") of the MMSZ5252BT1 datasheet and must be applied in enclosed or high-ambient environments.
Is MMSZ5252BT1 compatible with lead-free reflow soldering processes?
Yes, MMSZ5252BT1 is Pb-free and rated for peak reflow temperatures up to 260°C for 10 seconds, complying with IPC/JEDEC J-STD-020 moisture sensitivity level 1. Its void-free transfer-molded plastic case and corrosion-resistant finish ensure reliable solder joint formation in standard lead-free reflow profiles-no special prebake or nitrogen atmosphere is required for MMSZ5252BT1 assembly.
MMSZ5252BT1 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
MMSZ5252BT1 FAQ
1.How can I place an order for MMSZ5252BT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5252BT1 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 MMSZ5252BT1 reliable?
The price and inventory of MMSZ5252BT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5252BT1 is usually 5 days.
3.What payment methods are accepted for MMSZ5252BT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5252BT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5252BT1?
MMSZ5252BT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5252BT1 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 MMSZ5252BT1?
For technical support, including MMSZ5252BT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5252BT1 requirements.
6.How does Aetrix verify that MMSZ5252BT1 is sourced from the original manufacturer or authorized distributors?
All MMSZ5252BT1 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 MMSZ5252BT1 meets industry standards.
7.What is the process for return or replacement of MMSZ5252BT1?
All MMSZ5252BT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5252BT1, 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 MMSZ5252BT1 part is unused and in its original packaging.
Return procedure for MMSZ5252BT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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