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onsemi MMSZ5245ET1
- Part No.:
- MMSZ5245ET1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5245ET1.pdf
- Description:
- DIODE ZENER 15V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,376
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Product details
Overview
MMSZ5245ET1 from onsemi is a 15 V ±5% Zener diode in SOD-123 package, rated for 500 mW power dissipation at 75 °C on FR-5 board, with 8.5 mA test current, 16 Ω dynamic impedance at IZT, and 0.1 µA leakage at 11 V reverse bias. It serves as a precision voltage reference or overvoltage clamp in low-power analog and power-supply feedback circuits.
For engineers reviewing the MMSZ5245ET1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal derating behavior, junction-to-lead thermal resistance (150 °C/W), ESD robustness (>16 kV HBM), and SOD-123 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates in reverse-biased breakdown mode to maintain stable voltage regulation across varying load currents. Its 15 V nominal Zener voltage is specified at 8.5 mA test current (IZT) with ±5% tolerance and measured under thermal equilibrium at lead temperature TL = 30 °C ±1 °C.
The diode exhibits 16 Ω maximum dynamic impedance at IZT, 600 Ω maximum impedance at knee current (IZK = 0.25 mA), and 0.1 µA maximum reverse leakage at VR = 11 V - confirming suitability for low-current reference and protection roles where stability and low drift are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 14.25–15.75 V @ IZT = 8.5 mA - defines regulated output voltage range under standard test conditions |
| Power Dissipation (PD) | 500 mW @ TL = 75 °C - maximum continuous power on FR-5 board before thermal derating begins |
| Zener Impedance (ZZT) | ≤16 Ω @ IZT = 8.5 mA - indicates low AC voltage variation during small-signal regulation |
| Reverse Leakage (IR) | ≤0.1 µA @ VR = 11 V - ensures minimal quiescent current in standby or sensing applications |
| Thermal Resistance (RJL) | 150 °C/W - enables accurate junction temperature estimation from lead temperature in layout-constrained designs |
| ESD Rating | Class 3 (>16 kV) per HBM - supports handling and assembly without external protection in most industrial environments |
| Package | SOD-123 (1.60 × 2.69 × 1.16 mm) - surface-mount footprint compatible with automated placement and reflow |
Pinout & Package
SOD-123 plastic surface-mount package with cathode indicated by polarity band; case material is void-free thermosetting plastic, UL 94 V-0 rated, corrosion-resistant, and solderable at 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-bias anode-to-cathode voltage establishes Zener conduction |
| 2 (Non-banded End) | Anode | Typically tied to ground or lower-potential rail; current flows from cathode to anode during regulation |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables use in medium-current reference and clamp circuits without heatsinking on standard FR-5 boards |
| ±5% Zener Voltage Tolerance | Provides predictable regulation window for cost-sensitive feedback loops where tight trimming is unnecessary |
| 150 °C/W Junction-to-Lead Rθ | Supports thermal modeling using accessible lead temperature instead of inaccessible junction measurement |
| ESD Robustness >16 kV HBM | Reduces need for external ESD protection in board-level transient-prone interfaces |
| SOD-123 Footprint | Allows high-density placement in space-constrained consumer and portable electronics |
Applications
| Power Supply Feedback | Overvoltage Protection |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or buck-derived auxiliary supplies. IC Role / Device Role / Timing Role: Zener reference element in optocoupler-based feedback network. Use Value: 15 V nominal voltage sets precise error amplifier threshold, enabling ±1% output regulation accuracy. | Use Scenario: Clamping input rails against surge events in USB-powered peripherals. IC Role / Device Role / Timing Role: Shunt protection device placed between VBUS and GND. Use Value: 0.1 µA leakage at 11 V ensures negligible standby drain; 225 W peak surge rating absorbs 8×20 µs transients. |
| Reference Voltage Source | Signal Level Translation |
Use Scenario: Providing stable bias for op-amp comparators in battery-monitoring circuits. IC Role / Device Role / Timing Role: Precision DC reference node for analog front-end scaling. Use Value: 16 Ω ZZT minimizes voltage shift under 100 µA load variations, preserving ADC input accuracy. | Use Scenario: Level-shifting logic signals between 3.3 V and 15 V domains in industrial I/O modules. IC Role / Device Role / Timing Role: Passive clamping diode limiting signal swing to safe thresholds. Use Value: Sharp 15 V breakdown onset prevents damage to downstream 12 V-rated receivers during fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C15 | Same 15 V nominal Zener, but SOT-23 package (larger footprint, higher RθJA = 300 °C/W) | Less suitable for ultra-dense layouts; higher thermal resistance limits power handling in confined areas | Select when existing SOT-23 land pattern is fixed and 500 mW rating is not required at elevated ambient temperatures |
| MMBZ5245ELT1G | Identical electrical specs and SOD-123 package, but dual-diode configuration (common-cathode pair) | Not a drop-in replacement; requires circuit redesign to utilize second diode or terminate unused terminal | Choose only if dual-Zener functionality is needed; otherwise MMSZ5245ET1 remains optimal single-device solution |
Compared with BZX84-C15 and MMBZ5245ELT1G, the MMSZ5245ET1 delivers best-in-class thermal performance (RJL = 150 °C/W) and smallest footprint among 15 V Zeners, making it preferred for thermally constrained, high-density power management designs.
Availability
MMSZ5245ET1 is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and reference voltage source applications requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for MMSZ5245ET1 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMSZ52xxET1G series is designed for general-purpose, medium-current voltage regulation and clamping in space-constrained surface-mount systems, emphasizing reliability, thermal efficiency, and manufacturability.
FAQ
What is the nominal Zener voltage of the MMSZ5245ET1 and how is it tested?
The MMSZ5245ET1 has a nominal Zener voltage of 15 V, with a guaranteed range of 14.25 V to 15.75 V (±5% tolerance). This value is measured at a test current IZT of 8.5 mA under thermal equilibrium conditions at lead temperature TL = 30 °C ±1 °C, as defined in the onsemi datasheet revision 10.
Does the MMSZ5245ET1 meet automotive qualification standards?
The MMSZ5245ET1 is not AEC-Q101 qualified. However, its automotive-grade counterpart - the SZMMSZ5245ET1G - carries the SZ prefix and is explicitly qualified to AEC-Q101 with PPAP capability. For non-automotive industrial or consumer use, the MMSZ5245ET1 remains fully suitable and shares identical electrical and thermal specifications.
What is the maximum surge power rating for the MMSZ5245ET1 and under what conditions?
The MMSZ5245ET1 supports a peak nonrepetitive surge power of 225 W for an 8 × 20 µs rectangular pulse waveform at TA = 25 °C. This rating is validated per Figure 11 in the datasheet and applies to transient overvoltage suppression without permanent degradation, provided pulse repetition is avoided.
How does the thermal resistance of the MMSZ5245ET1 affect its power handling capability?
The MMSZ5245ET1 has a junction-to-lead thermal resistance (RJL) of 150 °C/W, meaning each watt of dissipated power raises the junction temperature 150 °C above the lead temperature. This allows accurate thermal design using measurable lead temperature rather than inaccessible junction readings, supporting reliable operation up to 150 °C junction temperature when lead temperature is controlled.
Can the MMSZ5245ET1 be used as a substitute for the MMSZ5245ET1G?
Yes - the MMSZ5245ET1 and MMSZ5245ET1G are electrically and thermally identical. The "G" suffix denotes Pb-free packaging compliance; both share the same SOD-123 package, Zener characteristics, power ratings, and marking code "CC7". No circuit or layout changes are required when substituting MMSZ5245ET1 for MMSZ5245ET1G in RoHS-compliant or legacy assembly processes.
MMSZ5245ET1 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):
- 16 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 11 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
MMSZ5245ET1 FAQ
1.How can I place an order for MMSZ5245ET1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5245ET1 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 MMSZ5245ET1 reliable?
The price and inventory of MMSZ5245ET1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5245ET1 is usually 5 days.
3.What payment methods are accepted for MMSZ5245ET1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5245ET1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5245ET1?
MMSZ5245ET1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5245ET1 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 MMSZ5245ET1?
For technical support, including MMSZ5245ET1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5245ET1 requirements.
6.How does Aetrix verify that MMSZ5245ET1 is sourced from the original manufacturer or authorized distributors?
All MMSZ5245ET1 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 MMSZ5245ET1 meets industry standards.
7.What is the process for return or replacement of MMSZ5245ET1?
All MMSZ5245ET1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5245ET1, 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 MMSZ5245ET1 part is unused and in its original packaging.
Return procedure for MMSZ5245ET1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5245ET1 Tags
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