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onsemi MMSZ15ET1
- Part No.:
- MMSZ15ET1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ15ET1.pdf
- Description:
- DIODE ZENER 15V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:5,493
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Product details
Overview
MMSZ15ET1 from onsemi is a 15 V, ±5% tolerance Zener diode in SOD-123 package, rated for 500 mW power dissipation at 75 °C on FR-5 board, with 200 Ω dynamic impedance at 5 mA test current and 0.05 µA reverse leakage at 10.5 V, used for precision voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMSZ15ET1 datasheet, pinout, applications, or equivalent options, this device serves as a surface-mount voltage reference in power supply feedback loops, sensor biasing networks, and ESD-clamped I/O protection-where stable 15 V clamping, AEC-Q101 qualification, and 16 kV HBM ESD robustness are required.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable 15 V reference across its terminals under controlled current conditions. Its 200 Ω dynamic impedance (ZZT) at IZT = 5 mA ensures minimal voltage variation with load current changes, while its −55 °C to +150 °C junction temperature range supports automotive and industrial environments.
The device features a cathode-anode polarity marked by a band on the SOD-123 case, with thermal resistance of 340 °C/W (junction-to-ambient) and 150 °C/W (junction-to-lead), enabling predictable derating above 75 °C. Peak surge capability reaches 225 W for 8 × 20 µs pulses, supporting transient suppression in compact layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 14.25 V min / 15 V nominal / 15.75 V max at IZT = 5 mA - defines tight ±5% regulation window for stable reference generation |
| Dynamic Impedance (ZZT) | 200 Ω max at IZT = 5 mA - limits output voltage shift under varying load current in feedback paths |
| Reverse Leakage Current | 0.05 µA max at VR = 10.5 V - ensures negligible quiescent current draw in high-impedance bias networks |
| Power Dissipation | 500 mW at TL = 75 °C on FR-5 board - sets maximum continuous operating power before thermal derating applies |
| ESD Rating | Class 3 (>16 kV) per HBM - provides robustness against handling and system-level electrostatic discharge events |
| Peak Surge Power | 225 W for 8 × 20 µs pulse - enables transient voltage suppression without device failure during short-duration surges |
| Junction Temperature Range | −55 °C to +150 °C - supports operation in under-hood automotive, industrial control, and outdoor electronics |
Pinout & Package
SOD-123 surface-mount plastic package (1.60 × 2.69 × 1.16 mm), void-free thermosetting case with corrosion-resistant finish, cathode indicated by polarity band, UL 94 V-0 flammability rating, and 260 °C soldering tolerance for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output or voltage reference node; reverse-biased terminal where Zener breakdown occurs |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential rail; completes reverse-bias path for current-controlled regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control units and body electronics requiring reliability under thermal cycling and vibration |
| Pb-Free Construction | RoHS-compliant SOD-123 package with lead-free terminations compatible with modern reflow soldering profiles |
| Optimized for Automated Assembly | Small footprint and standardized tape-and-reel packaging (3,000 pcs/reel) support high-speed pick-and-place placement |
| High-Density Packaging | 1.60 mm width enables placement in space-constrained PCB areas such as portable instrumentation and sensor modules |
| Stable Temperature Coefficient | Low TC near zero crossing (~0 mV/°C) around 15 V improves reference stability across operating temperature range |
Applications
| Power Supply Feedback Regulation | Sensor Biasing Reference |
|---|---|
Use Scenario: Stabilizing output voltage in isolated DC-DC converters using optocoupler feedback loops. IC Role / Device Role / Timing Role: Zener reference providing precise 15 V threshold to error amplifier input. Use Value: Maintains ±1% output regulation accuracy despite line/load variations due to low ZZT and tight VZ tolerance. |
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) in industrial process sensors. IC Role / Device Role / Timing Role: Fixed-voltage bias source ensuring consistent sensor signal amplitude and linearity. Use Value: Enables <10 ppm/°C measurement drift through low-TC 15 V reference and sub-µA leakage. |
| I/O Port ESD Clamping | Overvoltage Protection Circuit |
Use Scenario: Protecting microcontroller GPIO pins from ESD events in human-interface devices. IC Role / Device Role / Timing Role: Low-capacitance shunt clamp limiting pin voltage to 15 V during transients. Use Value: Survives >16 kV HBM strikes without degradation while adding <2 pF parasitic capacitance to signal path. |
Use Scenario: Safeguarding ADC inputs against accidental 24 V misconnection in factory automation modules. IC Role / Device Role / Timing Role: Primary crowbar element diverting excess current when input exceeds 15.75 V. Use Value: Absorbs 225 W surge energy for 20 µs without failure, preventing downstream IC damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C15 | Same 15 V nominal Zener voltage, but 350 mW rating and SOT-23 package; higher ZZT (300 Ω) | Lower power handling and larger footprint limit use in high-density or high-surge environments | Select when cost sensitivity outweighs surge robustness and board space constraints |
| MMSZ15ET1G | Identical electrical specs and SOD-123 package; differs only in Pb-free marking suffix "G" per JEDEC standard | No functional difference; fully interchangeable in design and assembly | Prefer for RoHS-compliant production requiring documented Pb-free status |
Compared with BZX84-C15 and MMSZ15ET1G, the MMSZ15ET1 offers superior surge immunity (225 W vs. 100 W), tighter thermal resistance control (340 °C/W), and automotive-grade qualification-making it optimal for mission-critical regulation where reliability and density are prioritized over lowest unit cost.
Availability
MMSZ15ET1 is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interfaces, and consumer electronics requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MMSZ15ET1 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 MMSZxxxET1 series belongs to onsemi's precision Zener regulator product line, engineered for high-reliability voltage reference and clamping in space-constrained, thermally demanding systems.
FAQ
What is the Zener voltage tolerance of MMSZ15ET1?
The MMSZ15ET1 has a nominal Zener voltage of 15 V with a standard tolerance of ±5%, meaning the actual measured VZ falls between 14.25 V and 15.75 V at IZT = 5 mA and TA = 25 °C. This tolerance is confirmed in the Electrical Characteristics table on page 2 of the onsemi datasheet, and applies across the full operating temperature range.
Is MMSZ15ET1 suitable for automotive applications?
Yes, the MMSZ15ET1 is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications including engine control modules, body electronics, and infotainment power rails. Its −55 °C to +150 °C junction temperature range and 16 kV HBM ESD rating meet stringent automotive reliability requirements.
What is the maximum power dissipation for MMSZ15ET1 at 100 °C ambient?
At 100 °C ambient, the MMSZ15ET1 must be derated from its 500 mW rating at 75 °C. With a thermal resistance RJA of 340 °C/W, power dissipation drops to approximately 417 mW (500 mW − 6.7 mW/°C × 25 °C). Derating follows the curve in Figure 3 of the datasheet.
Does MMSZ15ET1 have a Pb-free package?
Yes, the MMSZ15ET1 is supplied in a Pb-free SOD-123 package compliant with RoHS Directive 2011/65/EU. The "ET1" suffix denotes the Pb-free variant; the "G" suffix (e.g., MMSZ15ET1G) indicates identical specifications with explicit Pb-free marking per JEDEC standards.
How does the dynamic impedance of MMSZ15ET1 affect voltage regulation accuracy?
The MMSZ15ET1 has a maximum dynamic impedance (ZZT) of 200 Ω at IZT = 5 mA. This value determines how much the output voltage shifts with changing load current-e.g., a 1 mA change in Zener current causes up to 200 mV variation. Lower ZZT improves regulation fidelity in feedback and reference circuits.
MMSZ15ET1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 15 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 10.5 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
MMSZ15ET1 FAQ
1.How can I place an order for MMSZ15ET1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ15ET1 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 MMSZ15ET1 reliable?
The price and inventory of MMSZ15ET1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ15ET1 is usually 5 days.
3.What payment methods are accepted for MMSZ15ET1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ15ET1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ15ET1?
MMSZ15ET1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ15ET1 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 MMSZ15ET1?
For technical support, including MMSZ15ET1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ15ET1 requirements.
6.How does Aetrix verify that MMSZ15ET1 is sourced from the original manufacturer or authorized distributors?
All MMSZ15ET1 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 MMSZ15ET1 meets industry standards.
7.What is the process for return or replacement of MMSZ15ET1?
All MMSZ15ET1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ15ET1, 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 MMSZ15ET1 part is unused and in its original packaging.
Return procedure for MMSZ15ET1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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