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onsemi MMSZ5240ET1G
- Part No.:
- MMSZ5240ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5240ET1G.pdf
- Description:
- DIODE ZENER 10V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:7,718
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Product details
Overview
MMSZ5240ET1G from onsemi is a 10 V ±5% Zener diode in SOD-123 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 leakage at 8 V reverse bias. It serves as a precision voltage reference or overvoltage clamp in low-power analog and digital supply rails.
For engineers reviewing the MMSZ5240ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal derating behavior, junction-to-lead thermal resistance, ESD robustness (Class 3 HBM >16 kV), and SOD-123 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates in reverse breakdown mode to maintain stable voltage regulation across varying load currents. Its 17 Ω Zener impedance at IZT = 20 mA ensures minimal voltage deviation under moderate dynamic loads, while its 600 Ω impedance at IZK = 0.25 mA supports low-current biasing applications.
The SOD-123 package provides a thermally optimized path with RJL = 150 °C/W, enabling reliable operation up to +150 °C junction temperature. Its cathode-band polarity marking and Pb-free construction comply with RoHS and AEC-Q101 requirements when specified as SZMMSZ5240ET1G.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.50–10.50 V at IZT = 20 mA; ±5% tolerance enables use in 10 V reference designs without post-calibration. |
| Power Dissipation (PD) | 500 mW at TL = 75 °C on FR-5 board; derates linearly at 6.7 mW/°C above 75 °C for thermal design margining. |
| Zener Impedance (ZZT) | 17 Ω max at IZT = 20 mA; ensures <±0.34 V output shift for ±5.8 mA load variation near regulation point. |
| Leakage Current (IR) | 3 µA max at VR = 8 V; guarantees negligible standby current draw in battery-powered voltage monitor circuits. |
| ESD Rating | Class 3 (>16 kV) per HBM; withstands handling and assembly without external protection in non-automotive environments. |
| Junction Temp Range | −55 °C to +150 °C; supports industrial and extended-temperature embedded control applications. |
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 band. Rated for 260 °C soldering (10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased during Zener operation; must be held at higher potential than anode. |
| 2 (Non-banded End) | Anode | Connected to circuit ground or lower-potential rail; completes current path during regulation or clamping. |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables stable 10 V reference generation in space-constrained DC-DC feedback networks without forced air or heatsinking. |
| Low Dynamic Impedance | 17 Ω at 20 mA allows tight voltage regulation in analog sensor excitation and ADC reference buffers. |
| Pb-Free & RoHS Compliant | Meets global environmental compliance mandates without requiring process requalification for legacy SMT lines. |
| High ESD Robustness | Class 3 HBM (>16 kV) eliminates need for discrete TVS protection in handheld and portable equipment interfaces. |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Monitoring |
|---|---|
Use Scenario: Stabilizing excitation voltage for resistive bridge sensors in PLC analog input modules. IC Role / Device Role / Timing Role: Zener voltage reference providing fixed 10 V bias to Wheatstone bridge, rejecting supply ripple. Use Value: 17 Ω ZZT limits voltage drift to <±0.2 V under 12 mA bridge current variation, improving measurement linearity. | Use Scenario: Clamping VBUS sense node in USB-C PD controller monitoring circuits. IC Role / Device Role / Timing Role: Overvoltage protection element limiting sensed voltage to 10.5 V maximum before ADC input. Use Value: 3 µA leakage at 8 V ensures <1 µW standby power loss, preserving battery life in always-on PD status reporting. |
| Automotive Body Control Module (BCM) Reset Circuit | IoT Edge Node Voltage Supervisor |
Use Scenario: Generating clean reset threshold for microcontroller in 12 V automotive subsystems. IC Role / Device Role / Timing Role: Precision shunt regulator feeding comparator input to detect brown-out conditions. Use Value: −55 °C to +150 °C operating range ensures functionality across engine bay thermal cycles without calibration drift. | Use Scenario: Supply rail monitoring in battery-powered LoRaWAN sensor nodes. IC Role / Device Role / Timing Role: Low-leakage voltage clamp protecting supervisor IC inputs during transient surges. Use Value: 600 W peak surge rating (8×20 µs) absorbs ESD events without degradation, extending field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C10 | 10 V ±5%, 300 mW rating, SOD-323 package, 20 Ω ZZT at 5 mA. | Lower power rating and smaller package limit thermal headroom in sustained 10 mA loads. | Select when board area is constrained and average power <150 mW; verify thermal relief pad design for SOD-323. |
| MMBZ5240ELT1G | 10 V ±5%, 350 mW rating, SOT-23 package, 22 Ω ZZT at 20 mA, same manufacturer. | Larger SOT-23 footprint and higher ZZT reduce regulation accuracy in precision references. | Choose only if existing SOT-23 layout prohibits SOD-123 rework; expect ~0.15 V higher voltage deviation at full load. |
Compared with BZX584C10 and MMBZ5240ELT1G, the MMSZ5240ET1G delivers superior thermal performance (500 mW vs ≤350 mW), tighter ZZT, and proven suitability for high-reliability industrial PCB assemblies using standard SOD-123 land patterns.
Availability
MMSZ5240ET1G is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB-C power monitoring, automotive reset circuits, and IoT voltage supervision requiring stable component supply across long production lifecycles.
Supply support for MMSZ5240ET1G 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 was designed for general-purpose, medium-current Zener regulation in space-constrained surface-mount applications where reliability, thermal stability, and standardized packaging are critical.
FAQ
What is the nominal Zener voltage of the MMSZ5240ET1G and how is it tested?
The MMSZ5240ET1G has a nominal Zener voltage of 10 V, with a guaranteed range of 9.50 V to 10.50 V at a test current of 20 mA (IZT). This value is measured with the device junction in thermal equilibrium at lead temperature TL = 30 °C ±1 °C, per onsemi's Electrical Characteristics table on page 2 of the official datasheet. The MMSZ5240ET1G maintains this specification across its full operating temperature range.
Does the MMSZ5240ET1G meet automotive qualification standards?
The base MMSZ5240ET1G is not automotive-qualified, but its automotive-grade variant SZMMSZ5240ET1G is AEC-Q101 qualified and PPAP capable. The SZ-prefix version undergoes additional site-specific controls and change management, making it suitable for body electronics and infotainment systems. For non-automotive applications, the MMSZ5240ET1G remains fully compliant with industrial reliability requirements.
What is the maximum allowable reverse leakage current for the MMSZ5240ET1G?
The MMSZ5240ET1G specifies a maximum reverse leakage current (IR) of 3 µA at a reverse voltage (VR) of 8 V and ambient temperature of 25 °C. This low leakage ensures minimal parasitic loading in high-impedance reference or monitoring circuits. At higher temperatures or voltages, leakage increases predictably per Figure 8 in the datasheet, but remains within design-safe margins for most 10 V regulation tasks.
Can the MMSZ5240ET1G be used in place of older MMSZ5240BT1G parts?
Yes - the MMSZ5240ET1G replaces the obsolete MMSZ5240BT1G with identical electrical specifications, SOD-123 mechanical form factor, and enhanced Pb-free compliance. Key improvements include updated thermal resistance characterization (RJL = 150 °C/W), tighter process control, and Class 3 HBM ESD rating. No PCB layout or schematic changes are required when upgrading from MMSZ5240BT1G to MMSZ5240ET1G.
How does the thermal derating curve affect practical power handling of the MMSZ5240ET1G?
The MMSZ5240ET1G is rated for 500 mW at lead temperature (TL) = 75 °C on FR-5 board, derating linearly at 6.7 mW/°C above that point. At 100 °C TL, usable power drops to ~333 mW; at 125 °C, it falls to ~167 mW. Designers must calculate actual TL using RJL = 150 °C/W and expected power dissipation to ensure junction temperature stays below +150 °C - critical for long-term reliability in enclosed industrial enclosures.
MMSZ5240ET1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- MMSZ52xxxT1G
- 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
MMSZ5240ET1G FAQ
1.How can I place an order for MMSZ5240ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5240ET1G 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 MMSZ5240ET1G reliable?
The price and inventory of MMSZ5240ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5240ET1G is usually 5 days.
3.What payment methods are accepted for MMSZ5240ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5240ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5240ET1G?
MMSZ5240ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5240ET1G 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 MMSZ5240ET1G?
For technical support, including MMSZ5240ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5240ET1G requirements.
6.How does Aetrix verify that MMSZ5240ET1G is sourced from the original manufacturer or authorized distributors?
All MMSZ5240ET1G 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 MMSZ5240ET1G meets industry standards.
7.What is the process for return or replacement of MMSZ5240ET1G?
All MMSZ5240ET1G units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5240ET1G, 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 MMSZ5240ET1G part is unused and in its original packaging.
Return procedure for MMSZ5240ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5240ET1G Tags
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