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onsemi MMSZ24T1
- Part No.:
- MMSZ24T1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ24T1.pdf
- Description:
- DIODE ZENER 24V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,174
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Product details
Overview
MMSZ24T1 from onsemi is a 24 V ±5% Zener voltage regulator diode in SOD−123 surface-mount package, rated for 500 mW power dissipation at 75°C, with 70 Ω dynamic impedance at 5 mA test current and 0.05 μA reverse leakage at 16.8 V. It serves as a precision voltage reference or overvoltage clamp in low-power DC supply rails and sensor interface circuits.
For engineers reviewing the MMSZ24T1 datasheet, pinout, applications, or equivalent options, this device is selected for stable 24 V regulation in space-constrained industrial control modules, automotive body electronics, and IoT sensor nodes where AEC−Q101 qualification and high ESD immunity (>16 kV HBM) are required.
Technical Context
The MMSZ24T1 operates as a two-terminal silicon Zener diode optimized for reverse-biased breakdown regulation. Its nominal 24 V Zener voltage is specified at IZT = 5 mA with ±5% tolerance, and exhibits a temperature coefficient of approximately +6.5 mV/°C (inferred from Figure 1 for 24 V devices), enabling predictable drift compensation in mid-voltage references.
It delivers 500 mW total power dissipation on FR−5 board up to 75°C, derating linearly at 6.7 mW/°C above that, and maintains thermal resistance of 340°C/W junction-to-ambient - critical for thermal design in sealed enclosures or stacked PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8 V min / 24 V nom / 25.2 V max @ IZT = 5 mA - defines regulated output range under standard test conditions |
| Zener Impedance (ZZT) | 70 Ω max @ IZT = 5 mA - determines output voltage stability under load transients |
| Reverse Leakage (IR) | 0.05 μA max @ VR = 16.8 V - ensures minimal quiescent current in standby mode |
| Power Dissipation (PD) | 500 mW @ TL = 75°C - sets maximum continuous power handling on standard PCB |
| Thermal Resistance (RJA) | 340°C/W - enables thermal modeling for ambient temperature rise in compact layouts |
| ESD Rating | Class 3 (>16 kV) per HBM - supports robustness in handling and end-equipment surge environments |
| Junction Temp Range | −55°C to +150°C - qualifies for under-hood automotive and industrial outdoor deployments |
Pinout & Package
SOD−123 plastic surface-mount package (1.60 × 2.69 × 1.16 mm), void-free thermosetting case with corrosion-resistant finish, cathode indicated by polarity band. Designed for automated pick-and-place and reflow soldering (260°C/10 s max).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage rail; reverse-bias terminal where Zener breakdown occurs |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential node; completes bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 Qualified | Validated for automotive body electronics and chassis applications requiring PPAP documentation |
| Small SOD−123 Footprint | Enables high-density placement in space-limited modules such as battery management sensors and LED drivers |
| High ESD Immunity | Withstands >16 kV human-body-model discharge without parameter shift - reduces need for external TVS protection |
| Pb−Free Construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 |
| Stable 24 V Reference | ±5% tolerance and low 70 Ω dynamic impedance support accurate analog signal conditioning in 24 V industrial systems |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Regulating excitation voltage for 24 V pressure transducers in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Zener diode providing stable 24 V reference for bridge sensor biasing and ADC input scaling. Use Value: Maintains <±1% output variation across −40°C to +85°C ambient due to predictable TC and low ZZT, improving measurement repeatability. | Use Scenario: Clamping CAN transceiver supply rail against load-dump spikes in door module ECUs. IC Role / Device Role / Timing Role: Overvoltage protector shunting transient energy above 25.2 V to ground during ISO 7637-2 pulse 5a events. Use Value: Withstands repeated 16 kV ESD strikes and operates reliably at 125°C junction temperature per AEC−Q101 stress testing. |
| IoT Node Power Management | Programmable Logic Controller Input Protection |
Use Scenario: Providing reference voltage for low-power microcontroller brown-out detection in solar-powered remote sensors. IC Role / Device Role / Timing Role: Precision Zener establishing threshold for reset circuitry when main 24 V rail drops below 22.8 V. Use Value: Draws only 0.05 μA leakage at 16.8 V, extending battery life in multi-year deployments. | Use Scenario: Protecting digital input optocoupler LEDs from overvoltage in 24 V DC industrial PLC backplanes. IC Role / Device Role / Timing Role: Shunt regulator clamping input voltage to safe levels during field wiring faults or induced surges. Use Value: 500 mW rating allows sustained clamping during 100 ms overvoltage events without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C24 | Same 24 V ±5% Zener voltage, but SOT-23 package (larger footprint, higher RJA = 370°C/W), 350 mW rating | Lower power handling and less thermal margin in dense layouts; not AEC−Q101 qualified | Select when legacy SOT-23 footprint compatibility is required and automotive qualification is unnecessary |
| MMBZ5242B | 24 V ±5% Zener, SOT-23 package, 350 mW, but higher ZZT = 33 Ω @ 20 mA (not directly comparable at 5 mA) | Optimized for higher test currents; less stable regulation at low-current sensor biasing | Prefer for cost-sensitive consumer applications where 20 mA operating point dominates and AEC−Q101 is not mandated |
Compared with BZX84-C24 and MMBZ5242B, the MMSZ24T1 offers superior thermal performance (500 mW vs. 350 mW), AEC−Q101 qualification, and tighter low-current regulation stability - making it the preferred choice for automotive and industrial 24 V reference designs demanding long-term reliability.
Availability
MMSZ24T1 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and IoT node power management requiring stable component supply with full traceability and lifecycle continuity.
Supply support for MMSZ24T1 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.
The MMSZ24T1 belongs to the MMSZxxxT1G Zener regulator series designed specifically for high-reliability, surface-mount voltage reference and clamping in space-constrained, thermally demanding environments.
FAQ
What is the Zener voltage tolerance of the MMSZ24T1?
The MMSZ24T1 has a nominal Zener voltage of 24 V with a standard tolerance of ±5%, meaning its actual breakdown voltage falls between 22.8 V and 25.2 V when tested at IZT = 5 mA and TA = 25°C. This tolerance is confirmed in the Electrical Characteristics table on page 2 of the official onsemi datasheet (Rev. 13, June 2024). The MMSZ24T1 maintains this specification across its qualified operating temperature range.
Is the MMSZ24T1 suitable for automotive applications?
Yes, the MMSZ24T1 is AEC−Q101 qualified and PPAP capable, confirming its suitability for automotive applications including body electronics, lighting control, and sensor modules. Its guaranteed operation from −55°C to +150°C junction temperature, high ESD immunity (>16 kV HBM), and Pb−free construction meet key automotive reliability requirements. The MMSZ24T1 is explicitly listed in onsemi's AEC−Q101 qualified product portfolio.
What is the maximum power dissipation of the MMSZ24T1 at 100°C ambient?
At 100°C ambient, the MMSZ24T1 must be derated from its 500 mW rating at 75°C using the specified derating factor of 6.7 mW/°C. The allowable power is therefore 500 mW − (100°C − 75°C) × 6.7 mW/°C = 332.5 mW. This value assumes mounting on FR−5 board per datasheet Note 1 and is validated by onsemi's steady-state derating curve (Figure 3). The MMSZ24T1 remains functional within this limit without exceeding its 150°C maximum junction temperature.
Does the MMSZ24T1 have a defined forward voltage specification?
Yes, the MMSZ24T1 specifies a maximum forward voltage (VF) of 0.95 V at IF = 10 mA and TA = 25°C, as stated in the Electrical Characteristics summary on page 1 of the datasheet. This parameter is relevant when the device is used in forward conduction (e.g., as a clamp during positive transients) and confirms compatibility with standard logic-level drive requirements. The MMSZ24T1's forward characteristic is consistent across the full MMSZxxxT1G series.
How is the cathode identified on the MMSZ24T1 package?
The cathode of the MMSZ24T1 is identified by a polarity band printed on the SOD−123 case - located at Pin 1 per the mechanical outline on page 6 of the datasheet. This band aligns with the banded end of the device body and corresponds to the cathode terminal in all electrical schematics and layout footprints. The MMSZ24T1's marking code "X5" appears adjacent to this band, confirming correct orientation during automated assembly.
MMSZ24T1 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):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 16.8 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
MMSZ24T1 FAQ
1.How can I place an order for MMSZ24T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ24T1 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 MMSZ24T1 reliable?
The price and inventory of MMSZ24T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ24T1 is usually 5 days.
3.What payment methods are accepted for MMSZ24T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ24T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ24T1?
MMSZ24T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ24T1 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 MMSZ24T1?
For technical support, including MMSZ24T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ24T1 requirements.
6.How does Aetrix verify that MMSZ24T1 is sourced from the original manufacturer or authorized distributors?
All MMSZ24T1 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 MMSZ24T1 meets industry standards.
7.What is the process for return or replacement of MMSZ24T1?
All MMSZ24T1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ24T1, 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 MMSZ24T1 part is unused and in its original packaging.
Return procedure for MMSZ24T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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