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onsemi MMSZ5250ET1
- Part No.:
- MMSZ5250ET1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5250ET1.pdf
- Description:
- DIODE ZENER 20V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:5,685
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Product details
Overview
MMSZ5250ET1 from onsemi is a 20 V ±5% Zener voltage regulator diode in SOD-123 surface-mount package, rated for 500 mW power dissipation at 75 °C on FR-5 board, with 6.2 mA test current, 25 Ω dynamic impedance at IZT, and 0.1 µA reverse leakage at 15 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog sensing and power rail stabilization circuits.
For engineers reviewing the MMSZ5250ET1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, SOD-123 mechanical interface details, and validated alternative parts for voltage reference design and BOM optimization.
Technical Context
The MMSZ5250ET1 operates as a silicon planar Zener diode optimized for stable reverse-biased regulation at nominal 20 V. Its 25 Ω Zener impedance at 6.2 mA ensures tight voltage control under moderate load variation, while its 150 °C maximum junction temperature supports operation in thermally constrained industrial PCB environments.
Designed for automated SMT assembly, it features Pb-free construction, UL 94 V-0 flammability rating, and ESD robustness (Class 3, >16 kV HBM). The device exhibits predictable thermal derating-6.7 mW/°C above 75 °C-and maintains regulation integrity across −55 °C to +150 °C storage and operating ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19.0–21.0 V at 6.2 mA; ±5% tolerance enables use in 20 V reference designs requiring ±1 V margin. |
| Power Dissipation (PD) | 500 mW at TL = 75 °C; derates linearly at 6.7 mW/°C above 75 °C for thermal-aware layout planning. |
| Zener Impedance (ZZT) | 25 Ω max at IZT = 6.2 mA; low dynamic resistance minimizes output voltage shift under varying load current. |
| Reverse Leakage (IR) | 0.1 µA max at VR = 15 V; ensures minimal quiescent current draw in battery-powered voltage monitor circuits. |
| Junction-to-Lead RθJL | 150 °C/W; supports direct thermal coupling to copper pour for enhanced power handling in compact layouts. |
| ESD Rating | Class 3 (>16 kV) per HBM; eliminates need for external ESD protection in front-end sensor interface applications. |
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. Maximum soldering temperature: 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs at 20 V. |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential rail; completes bias path for Zener conduction during regulation. |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating on FR-5 Board | Enables reliable voltage clamping in space-constrained consumer and industrial PCBs without forced cooling. |
| 25 Ω Zener Impedance at 6.2 mA | Delivers <±50 mV output deviation across ±1 mA load current swing-critical for ADC reference stability. |
| 0.1 µA Reverse Leakage at 15 V | Reduces standby power loss in always-on monitoring circuits, extending battery life in portable sensors. |
| Pb-Free & AEC-Q101 Capable (SZ variant) | Supports automotive-grade sourcing paths and RoHS-compliant production without redesign. |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Clamp |
|---|---|
Use Scenario: Stabilizing 3.3 V or 5 V supply rails feeding analog front-ends of temperature, pressure, or current sensors in factory automation modules. IC Role / Device Role / Timing Role: Zener voltage reference and overvoltage protector for op-amp bias networks and ADC reference inputs. Use Value: Maintains <±1% reference accuracy despite ambient temperature swings from −40 °C to +85 °C due to predictable TC and low ZZT. | Use Scenario: Clamping transient surges on USB-C VBUS lines during hot-plug events or ESD strikes in portable docking stations. IC Role / Device Role / Timing Role: Fast-response shunt protector absorbing up to 225 W non-repetitive surge energy (8 × 20 µs pulse). Use Value: Prevents downstream PMIC damage by clamping VBUS to ≤21 V before TVS response time threshold is exceeded. |
| Low-Power IoT Node Voltage Monitor | Programmable Logic Supply Rail Clamp |
Use Scenario: Monitoring Li-ion battery voltage in BLE-enabled asset trackers, triggering MCU wake-up when cell drops below 3.0 V. IC Role / Device Role / Timing Role: Precision Zener-based comparator input reference with ultra-low leakage (<0.1 µA). Use Value: Extends shelf life by limiting self-discharge current in sleep mode-critical for 10-year battery life targets. | Use Scenario: Protecting FPGA or CPLD I/O banks powered from 1.8 V or 2.5 V LDOs against accidental overvoltage from misconfigured debug interfaces. IC Role / Device Role / Timing Role: Secondary shunt regulator placed in parallel with primary LDO output to limit rail excursion. Use Value: Limits voltage overshoot to <2.7 V during 100 ns transients, preventing gate oxide stress in 28 nm logic processes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C20 | 20 V ±5%, 500 mW, SOD-323 package; higher ZZT (40 Ω) and lower IZT (5 mA); no AEC-Q101 variant. | Smaller footprint but reduced thermal mass; less suitable for sustained 6.2 mA regulation in high-ambient environments. | Select when board area is critical and peak power is <300 mW; verify thermal relief pad design for equivalent derating. |
| MMBZ5250ELT1G | 20 V ±5%, 350 mW, SOT-23 package; identical ZZT (25 Ω) and IZT (6.2 mA); same Pb-free/AEC-Q101 support. | Larger package volume but superior heat spreading via three-pin thermal pad; better suited for reflow profiles with extended soak times. | Prefer for high-volume automotive production where SOT-23 pick-and-place yield and thermal reliability outweigh SOD-123 size advantage. |
Compared with BZX584C20 and MMBZ5250ELT1G, the MMSZ5250ET1 offers optimal balance of SOD-123 compactness, 500 mW thermal capability, and 25 Ω regulation fidelity-making it ideal for industrial sensor nodes where board space and long-term stability are jointly constrained.
Availability
MMSZ5250ET1 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C power delivery clamp, and low-power IoT node voltage monitor applications requiring stable component supply, consistent parametric performance, and full traceability.
Supply support for MMSZ5250ET1 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 MMSZ52xxET1G series is part of onsemi's general-purpose Zener regulator portfolio, engineered for medium-current, surface-mount voltage reference and clamping in cost-sensitive, high-reliability embedded systems.
FAQ
What is the Zener voltage tolerance of the MMSZ5250ET1?
The MMSZ5250ET1 has a nominal Zener voltage of 20 V with a standard tolerance of ±5%, meaning its actual reverse breakdown voltage falls between 19.0 V and 21.0 V when tested at 6.2 mA and 25 °C. This tolerance is guaranteed per onsemi's datasheet revision 10 and applies to all units shipped under this part number.
Can the MMSZ5250ET1 be used in automotive applications?
Yes-the SZMMSZ5250ET1G variant is AEC-Q101 qualified and PPAP capable, supporting automotive use. While the base MMSZ5250ET1 is not automotive-qualified, its identical electrical specs and Pb-free construction allow qualification-ready design reuse. Always specify the SZ-prefix part for production automotive programs.
What is the maximum surge power the MMSZ5250ET1 can handle?
The MMSZ5250ET1 supports a nonrepetitive peak surge power of 225 W for an 8 × 20 µs pulse waveform at TA = 25 °C. This rating is defined per Figure 11 in the datasheet and enables transient suppression in power supply input stages without additional TVS devices.
How does thermal derating affect the MMSZ5250ET1's power dissipation?
At lead temperature (TL) = 75 °C, the MMSZ5250ET1 delivers its full 500 mW rating. Above 75 °C, power must be linearly derated at 6.7 mW/°C-so at TL = 100 °C, maximum allowable dissipation drops to 332.5 mW. This reflects its 150 °C/W junction-to-lead thermal resistance.
Is the MMSZ5250ET1 compatible with lead-free reflow soldering processes?
Yes-the MMSZ5250ET1 is Pb-free and rated for peak reflow temperatures up to 260 °C for 10 seconds, fully compliant with IPC/JEDEC J-STD-020 moisture sensitivity and lead-free soldering standards. Its SOD-123 package uses corrosion-resistant, easily solderable finish.
MMSZ5250ET1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 20 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 15 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
MMSZ5250ET1 FAQ
1.How can I place an order for MMSZ5250ET1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5250ET1 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 MMSZ5250ET1 reliable?
The price and inventory of MMSZ5250ET1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5250ET1 is usually 5 days.
3.What payment methods are accepted for MMSZ5250ET1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5250ET1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5250ET1?
MMSZ5250ET1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5250ET1 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 MMSZ5250ET1?
For technical support, including MMSZ5250ET1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5250ET1 requirements.
6.How does Aetrix verify that MMSZ5250ET1 is sourced from the original manufacturer or authorized distributors?
All MMSZ5250ET1 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 MMSZ5250ET1 meets industry standards.
7.What is the process for return or replacement of MMSZ5250ET1?
All MMSZ5250ET1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5250ET1, 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 MMSZ5250ET1 part is unused and in its original packaging.
Return procedure for MMSZ5250ET1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5250ET1 Tags
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