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onsemi MMSZ24ET1
- Part No.:
- MMSZ24ET1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ24ET1.pdf
- Description:
- DIODE ZENER 24V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:5,512
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Product details
Overview
MMSZ24ET1 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 70 Ω dynamic impedance at 5 mA test current and 0.05 µA reverse leakage at 19.2 V, used for precision voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMSZ24ET1 datasheet, pinout, applications, or equivalent options, this part serves as a surface-mount voltage reference in power supply feedback loops, ESD-clamped I/O protection networks, and low-current biasing circuits where thermal stability and AEC-Q101 qualification are required.
Technical Context
The MMSZ24ET1 operates as a two-terminal silicon Zener diode with sharp reverse breakdown at nominal 24 V, specified under 5 mA Zener test current (IZT) and characterized with 70 Ω dynamic impedance (ZZT) at that condition. Its temperature coefficient is +12.6 mV/°C across −55 °C to +150 °C, enabling predictable drift compensation in stable reference designs.
It features Class 3 ESD robustness (>16 kV HBM), peak surge capability of 225 W (8 × 20 µs pulse), and junction-to-ambient thermal resistance of 340 °C/W - all validated in the SOD-123 plastic case with Pb-free finish and UL 94 V-0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8 V min / 24 V nom / 25.2 V max at IZT = 5 mA - defines tight ±5% tolerance band for stable reference accuracy |
| Dynamic Impedance (ZZT) | 70 Ω max at IZT = 5 mA - ensures minimal output voltage variation under load current changes |
| Reverse Leakage (IR) | 0.05 µA max at VR = 19.2 V - guarantees negligible quiescent current in standby protection circuits |
| Power Dissipation (PD) | 500 mW at TL = 75 °C on FR-5 board - supports continuous operation in compact PCB layouts without forced cooling |
| Thermal Resistance (RJA) | 340 °C/W - determines junction temperature rise per milliwatt, critical for reliability in high-ambient environments |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct integration into unshielded I/O lines without external ESD suppressors |
| AEC-Q101 Qualified | Validated for automotive-grade reliability - suitable for under-hood and infotainment system voltage clamping |
Pinout & Package
SOD-123 surface-mount plastic package (1.60 × 2.69 × 1.16 mm), void-free thermosetting case with corrosion-resistant, solderable finish; cathode indicated by polarity band; maximum soldering temperature 260 °C for 10 seconds; UL 94 V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node or voltage reference point; carries reverse-biased current during Zener conduction |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential rail; completes current path during breakdown operation |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating on FR-5 Board | Enables use in space-constrained consumer and industrial PCBs without derating penalties up to 75 °C |
| ±5% Zener Voltage Tolerance | Reduces need for post-assembly trimming in voltage reference and feedback divider applications |
| 16 kV HBM ESD Robustness | Eliminates need for discrete TVS devices in low-speed sensor interface and microcontroller I/O protection |
| AEC-Q101 Qualification | Supports deployment in automotive modules requiring extended temperature operation and long-term reliability validation |
| Pb-Free SOD-123 Packaging | Meets RoHS compliance requirements and supports automated reflow assembly with standard lead-free profiles |
Applications
| Automotive Sensor Signal Conditioning | Industrial PLC Input Protection |
|---|---|
Use Scenario: Stabilizing 24 V supply rails feeding analog front-ends in engine control units and exhaust gas sensors. IC Role / Device Role / Timing Role: Zener voltage reference and overvoltage clamp for op-amp biasing and ADC reference buffers. Use Value: Maintains <±1% output deviation across −40 °C to +125 °C ambient due to known +12.6 mV/°C TC and low ZZT. |
Use Scenario: Protecting 24 V digital input channels against transients induced by relay switching and motor back-EMF. IC Role / Device Role / Timing Role: Low-leakage shunt clamp limiting voltage to safe levels for optocoupler and microcontroller GPIO inputs. Use Value: Blocks >225 W surge pulses (8 × 20 µs) while drawing only 0.05 µA at 19.2 V - preserving signal integrity and minimizing false triggers. |
| Medical Diagnostic Equipment Biasing | IoT Edge Node Power Management |
Use Scenario: Providing stable 24 V reference for photodiode transimpedance amplifiers and precision DAC outputs. IC Role / Device Role / Timing Role: Precision voltage regulator in low-noise analog signal chains requiring repeatable DC offset. Use Value: Delivers 70 Ω dynamic impedance at 5 mA, reducing noise coupling and improving PSRR in sensitive measurement paths. |
Use Scenario: Regulating auxiliary 24 V rails in battery-powered gateways with intermittent LTE/Wi-Fi transmission bursts. IC Role / Device Role / Timing Role: Standby-mode voltage supervisor and transient suppressor for PMIC enable inputs and reset logic. Use Value: Draws sub-100 nA leakage at 19.2 V, extending battery life in always-on monitoring applications without sacrificing surge immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C24 | Same 24 V ±5% rating but SOT-23 package (higher RJA = 375 °C/W); 80 Ω ZZT at 5 mA | Lower power density; less suitable for high-density layouts or elevated ambient temperatures | Select when legacy SOT-23 footprint compatibility is required and thermal margin exceeds 10 °C |
| MMBZ5242BS | 24 V ±5%, SOT-323 package, 100 Ω ZZT, 0.1 µA IR at 19.2 V, no AEC-Q101 qualification | Higher leakage and unqualified for automotive; better suited for cost-sensitive consumer electronics | Choose for non-automotive applications where footprint size is prioritized over ESD robustness and qualification |
Compared with BZX84-C24 and MMBZ5242BS, the MMSZ24ET1 offers superior thermal performance (340 °C/W), lower dynamic impedance (70 Ω), and automotive-grade reliability - making it optimal for space-constrained, high-reliability 24 V regulation where long-term stability matters.
Availability
MMSZ24ET1 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial I/O protection, and medical analog biasing requiring stable component supply and full traceability.
Supply support for MMSZ24ET1 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMSZxxxET1G series targets high-reliability, surface-mount Zener regulation in space-constrained systems - designed specifically for automotive-grade voltage reference, ESD protection, and precision clamping where AEC-Q101 compliance and thermal robustness are mandatory.
FAQ
What is the Zener voltage tolerance of the MMSZ24ET1?
The MMSZ24ET1 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 guaranteed across the full operating temperature range and applies to every unit shipped, supporting consistent performance in production-level voltage reference designs.
Does the MMSZ24ET1 meet automotive reliability standards?
Yes, the MMSZ24ET1 is AEC-Q101 qualified and PPAP capable, having passed stress tests including high-temperature operating life, temperature cycling, and ESD (Class 3, >16 kV HBM). It is explicitly intended for automotive applications such as engine control, body electronics, and ADAS sensor interfaces where long-term reliability under thermal and electrical stress is critical - the MMSZ24ET1 delivers this with documented qualification evidence.
What is the maximum power dissipation of the MMSZ24ET1 on a standard PCB?
The MMSZ24ET1 is rated for 500 mW total power dissipation on an FR-5 board at a lead temperature (TL) of 75 °C, with linear derating of 6.7 mW/°C above that temperature. This specification reflects real-world board-level thermal performance - not just die limits - and enables reliable operation in compact, unventilated enclosures typical of industrial and automotive control modules using the MMSZ24ET1.
How does the MMSZ24ET1 perform under transient surge conditions?
The MMSZ24ET1 supports nonrepetitive peak surge power of 225 W for an 8 × 20 µs pulse waveform at TA = 25 °C, verified per Figure 11 in the official datasheet. This capability allows the MMSZ24ET1 to absorb common industrial transients like relay bounce or inductive kickback without degradation - a key design advantage over generic Zeners lacking published surge ratings.
Is the MMSZ24ET1 compatible with lead-free reflow soldering processes?
Yes, the MMSZ24ET1 is Pb-free and qualified for standard lead-free reflow profiles, with a maximum soldering temperature of 260 °C for 10 seconds. Its SOD-123 package uses a corrosion-resistant, easily solderable finish and meets JEDEC J-STD-020 moisture sensitivity level 1 - ensuring robust manufacturability in high-volume automated assembly lines using the MMSZ24ET1.
MMSZ24ET1 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
MMSZ24ET1 FAQ
1.How can I place an order for MMSZ24ET1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ24ET1 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 MMSZ24ET1 reliable?
The price and inventory of MMSZ24ET1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ24ET1 is usually 5 days.
3.What payment methods are accepted for MMSZ24ET1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ24ET1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ24ET1?
MMSZ24ET1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ24ET1 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 MMSZ24ET1?
For technical support, including MMSZ24ET1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ24ET1 requirements.
6.How does Aetrix verify that MMSZ24ET1 is sourced from the original manufacturer or authorized distributors?
All MMSZ24ET1 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 MMSZ24ET1 meets industry standards.
7.What is the process for return or replacement of MMSZ24ET1?
All MMSZ24ET1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ24ET1, 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 MMSZ24ET1 part is unused and in its original packaging.
Return procedure for MMSZ24ET1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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