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onsemi MMSZ5240ET1
- Part No.:
- MMSZ5240ET1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5240ET1.pdf
- Description:
- DIODE ZENER 10V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,888
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Product details
Overview
MMSZ5240ET1 from onsemi is a 10 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 17 Ω dynamic impedance at 20 mA test current and 3 µA reverse leakage at 8 V, used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the MMSZ5240ET1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, cathode/anode terminal mapping, and direct-fit alternatives for industrial power management and automotive-grade voltage stabilization designs.
Technical Context
This device operates as a two-terminal silicon Zener diode, conducting in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its 10 V nominal Zener voltage is specified at 20 mA test current (IZT), with temperature coefficient optimized for low-drift operation across −55 °C to +150 °C junction range.
The SOD-123 package enables automated placement and reflow soldering, with 260 °C maximum soldering temperature tolerance and UL 94 V-0 flammability rating. Thermal resistance from junction-to-lead is 150 °C/W, supporting reliable power handling in compact PCB layouts without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.5–10.5 V at IZT = 20 mA; ensures stable 10 V reference within ±5% tolerance for feedback sensing. |
| Power Dissipation (PD) | 500 mW at TL = 75 °C; defines maximum continuous power on standard FR-5 board before thermal derating. |
| Zener Impedance (ZZT) | 17 Ω max at IZT = 20 mA; determines output voltage regulation accuracy under dynamic load changes. |
| Reverse Leakage (IR) | 3 µA max at VR = 8 V; guarantees minimal quiescent current draw in standby or high-impedance bias networks. |
| Junction Temp Range | −55 °C to +150 °C; supports operation in under-hood automotive, industrial control, and outdoor power electronics. |
| ESD Rating | Class 3 (>16 kV HBM); enables robust handling during assembly and field operation without external protection. |
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 voltage node; reverse-biased terminal where Zener breakdown occurs. |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential rail; completes current path during regulation. |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables use in medium-current voltage references without external heat sinking on standard PCBs. |
| 17 Ω Dynamic Impedance | Delivers tight voltage regulation (<±0.17 V change per 10 mA load shift) in feedback paths. |
| 3 µA Max Leakage @ 8 V | Minimizes error in high-resistance divider networks and preserves battery life in low-power systems. |
| AEC-Q101 Qualified (SZ variant) | Validated for automotive applications including engine control modules and body electronics. |
| Pb-Free & RoHS Compliant | Meets global environmental compliance requirements for industrial and consumer end equipment. |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
|
Use Scenario: Regulating output voltage in isolated DC-DC converters using optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Provides precise 10 V reference to TL431 or similar shunt regulator IC. Use Value: Maintains ±1% output regulation across line/load/temperature with minimal component count. |
Use Scenario: Clamping transient surges on 12 V automotive power rails during load dump events. IC Role / Device Role / Timing Role: Acts as passive crowbar element limiting voltage to safe levels for downstream logic. Use Value: Absorbs up to 225 W peak surge (8 × 20 µs) without failure, protecting CAN transceivers and microcontrollers. |
| Industrial Sensor Biasing | Reference Voltage for ADC |
|
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) in PLC analog input modules. IC Role / Device Role / Timing Role: Supplies low-noise, temperature-stable bias to bridge sensor circuits. Use Value: Delivers <±0.5% drift over −40 °C to +85 °C ambient, improving measurement repeatability. |
Use Scenario: Generating accurate 10 V reference for 12-bit SAR ADCs in data acquisition systems. IC Role / Device Role / Timing Role: Sets full-scale input range for analog front-end signal conditioning. Use Value: Enables <±0.5 LSB integral nonlinearity error due to low dynamic impedance and leakage. |
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-C10LT1G | Same 10 V nominal Zener, but 300 mW rating and SOT-23 package; higher ZZT (20 Ω). | Lower power handling limits use in >15 mA continuous applications; smaller footprint may ease layout. | Select when board space is constrained and thermal budget allows reduced power margin. |
| MMBZ5240ELT1G | Identical electrical specs and SOD-123 package, but dual-diode configuration (two anodes, one cathode). | Supports bidirectional clamping or dual-rail referencing; requires modified schematic for single-Zener use. | Choose only if dual-diode functionality is required; otherwise MMSZ5240ET1 remains optimal single-device solution. |
Compared with BZX84-C10LT1G and MMBZ5240ELT1G, the MMSZ5240ET1 offers superior 500 mW thermal capability in the same SOD-123 footprint and avoids unnecessary dual-diode complexity, making it the preferred choice for dedicated 10 V reference and clamp roles in industrial and automotive power systems.
Availability
MMSZ5240ET1 is available at Aetrix Electronics and suitable for switch-mode power supplies, automotive overvoltage protection, and industrial sensor biasing requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MMSZ5240ET1 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 was designed specifically for high-reliability, surface-mount Zener regulation in space-constrained and thermally demanding environments, emphasizing manufacturability, ESD robustness, and AEC-Q101 readiness.
FAQ
What is the Zener voltage tolerance of MMSZ5240ET1?
The MMSZ5240ET1 has a nominal Zener voltage of 10 V with a standard tolerance of ±5%, meaning the actual measured voltage falls between 9.5 V and 10.5 V when tested at 20 mA (IZT) and 25 °C ambient. This tolerance is guaranteed across the full operating temperature range and applies to all units in the production lot.
Can MMSZ5240ET1 be used in automotive applications?
Yes - while the base MMSZ5240ET1 is not AEC-Q101 qualified, its SZ-prefix variant (SZMMSZ5240ET1G) is fully AEC-Q101 qualified and PPAP capable. The MMSZ5240ET1 shares identical electrical and thermal specifications and can be used in non-automotive industrial applications; for automotive deployment, the SZ variant must be selected.
What is the maximum surge power rating for MMSZ5240ET1?
The MMSZ5240ET1 supports a nonrepetitive peak surge power of 225 W for an 8 × 20 µs waveform at TA = 25 °C. This rating enables transient suppression in power rails subject to load dump or ESD events, provided pulse repetition is limited to allow full thermal recovery between events.
How does thermal derating affect MMSZ5240ET1's power handling?
MMSZ5240ET1 is rated for 500 mW at lead temperature (TL) = 75 °C on FR-5 board; above that, power must be linearly derated at 6.7 mW/°C. At TL = 100 °C, usable power drops to ~333 mW. Derating ensures junction temperature stays within −55 °C to +150 °C limits under sustained operation.
Is MMSZ5240ET1 Pb-free and RoHS compliant?
Yes - the "G" suffix in the full part number MMSZ5240ET1G (as documented in the official onsemi datasheet) confirms Pb-free construction and full RoHS compliance. The MMSZ5240ET1 ordering code refers to the same Pb-free device; no leaded version is offered in this series.
MMSZ5240ET1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 10 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 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
MMSZ5240ET1 FAQ
1.How can I place an order for MMSZ5240ET1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5240ET1 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 MMSZ5240ET1 reliable?
The price and inventory of MMSZ5240ET1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5240ET1 is usually 5 days.
3.What payment methods are accepted for MMSZ5240ET1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5240ET1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5240ET1?
MMSZ5240ET1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5240ET1 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 MMSZ5240ET1?
For technical support, including MMSZ5240ET1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5240ET1 requirements.
6.How does Aetrix verify that MMSZ5240ET1 is sourced from the original manufacturer or authorized distributors?
All MMSZ5240ET1 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 MMSZ5240ET1 meets industry standards.
7.What is the process for return or replacement of MMSZ5240ET1?
All MMSZ5240ET1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5240ET1, 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 MMSZ5240ET1 part is unused and in its original packaging.
Return procedure for MMSZ5240ET1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5240ET1 Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZT52C15-7-F
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BZX84C3V3LT1G
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MMSZ5245BS-7-F
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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SMAJ4744A-TP
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SMAZ12-13-F
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