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onsemi MMSZ5235ET1G
- Part No.:
- MMSZ5235ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5235ET1G.pdf
- Description:
- DIODE ZENER 6.8V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:11,645
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Product details
Overview
MMSZ5235ET1G from onsemi is a 6.8 V ±5% Zener diode in SOD-123 package, rated for 500 mW power dissipation at 75 °C on FR-5 board, with 5 Ω dynamic impedance at 20 mA test current and 0.25 µA leakage at 3 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 MMSZ5235ET1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, cathode/anode terminal mapping, and direct alternatives for voltage regulation in space-constrained PCBs.
Technical Context
The MMSZ5235ET1G operates in reverse breakdown mode to maintain stable 6.8 V output across varying load currents (IZK = 0.25 mA to IZT = 20 mA), with temperature coefficient near zero at this voltage level per typical characterization data. Its junction-to-lead thermal resistance of 150 °C/W enables reliable operation under transient surge conditions up to 225 W (8 × 20 µs pulse).
Designed for surface-mount assembly on FR-4/FR-5 boards, it features Pb-free plating, UL 94 V-0 flammability rating, and ESD robustness >16 kV HBM. Polarity is marked by a cathode band, and maximum soldering temperature is 260 °C for 10 seconds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.46–7.14 V at 20 mA; nominal 6.8 V ±5% ensures tight tolerance for reference stability |
| Power Dissipation (PD) | 500 mW at TL = 75 °C; derates linearly at 6.7 mW/°C above 75 °C for thermal design margin |
| Zener Impedance (ZZT) | 5 Ω max at IZT = 20 mA; low dynamic impedance minimizes output voltage variation under load transients |
| Leakage Current (IR) | 0.25 µA max at VR = 3 V; ensures minimal quiescent current draw in standby circuits |
| Peak Surge Power (Ppk) | 225 W for 8 × 20 µs pulse; supports transient overvoltage suppression without failure |
| Junction Temp Range | −55 °C to +150 °C; qualified for extended industrial and automotive ambient environments |
| ESD Rating | Class 3 (>16 kV) per Human Body Model; withstands handling and board-level ESD events |
Pinout & Package
SOD-123 surface-mount package: 1.60 mm × 2.69 mm × 1.16 mm body, void-free thermosetting plastic case with corrosion-resistant, solderable finish. Cathode indicated by polarity band; microdot may appear near cathode end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; reverse-biased during Zener operation |
| 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 regulation without heatsinking on standard PCBs |
| Low Zener Impedance (5 Ω) | Delivers <±10 mV output shift across 1–20 mA load range for high-accuracy references |
| Pb-Free & RoHS Compliant | Meets global environmental compliance requirements without compromising solder joint reliability |
| Automated Assembly Optimized | Small SOD-123 footprint supports high-density routing and pick-and-place compatibility |
| High ESD Robustness | Eliminates need for external ESD protection in low-voltage interface applications |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
|
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature/humidity sensors. IC Role / Device Role / Timing Role: Zener voltage reference providing stable 6.8 V bias to op-amp gain stage and ADC reference divider. Use Value: Tight ±5% tolerance and 5 Ω impedance ensure <0.5 LSB error contribution across −40 °C to +85 °C operating range. |
Use Scenario: Clamping transient surges on USB VBUS line during hot-plug events. IC Role / Device Role / Timing Role: Shunt overvoltage protector diverting surge current away from USB controller IC. Use Value: 225 W peak surge rating handles 8 × 20 µs pulses per IEC 61000-4-5 Level 3 without degradation. |
| Low-Power Microcontroller Reset Circuit | LED Driver Current Reference |
|
Use Scenario: Generating precise reset threshold for ARM Cortex-M0+ MCU operating at 3.3 V. IC Role / Device Role / Timing Role: Zener-based voltage detector feeding comparator input to trigger POR or brown-out reset. Use Value: 0.25 µA leakage at 3 V ensures <100 nA loading on weak pull-up networks, preserving timing accuracy. |
Use Scenario: Setting constant current for white LED string in battery-powered lighting module. IC Role / Device Role / Timing Role: Voltage reference in adjustable current-sense amplifier feedback loop. Use Value: Stable 6.8 V output enables ±1% LED current regulation despite 10% battery voltage sag from 4.2 V to 3.7 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C6V8 | 6.8 V ±5%, 300 mW rating, SOD-323 package (1.7 × 2.7 × 1.1 mm) | Lower power handling limits use in >15 mA continuous applications; smaller footprint increases layout density | Select when board space is critical and peak current remains below 15 mA |
| MM3Z6V8T1G | 6.8 V ±5%, 200 mW rating, SOD-323 package, 15 Ω ZZT | Higher impedance and lower power reduce regulation accuracy and surge capability vs. MMSZ5235ET1G | Choose only for ultra-low-cost, non-critical biasing where 500 mW and 5 Ω are unnecessary |
Compared with BZX584-C6V8 and MM3Z6V8T1G, the MMSZ5235ET1G provides superior thermal performance (500 mW vs. 300/200 mW), lower dynamic impedance (5 Ω vs. ~10/15 Ω), and higher surge resilience-making it optimal for industrial-grade voltage references requiring long-term stability under variable load and temperature.
Availability
MMSZ5235ET1G is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB port overvoltage protection, and low-power microcontroller reset circuits requiring stable component supply with full traceability and lifecycle support.
Supply support for MMSZ5235ET1G 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and IoT markets.
The MMSZ52xxET1G series was designed for general-purpose, medium-current voltage regulation in compact surface-mount applications-emphasizing reliability, thermal performance, and manufacturability in high-volume electronics assembly.
FAQ
What is the Zener voltage tolerance of the MMSZ5235ET1G?
The MMSZ5235ET1G has a nominal Zener voltage of 6.8 V with a standard tolerance of ±5%, meaning its actual reverse breakdown voltage falls between 6.46 V and 7.14 V when tested at 20 mA (IZT) and 25 °C ambient. This tolerance is guaranteed per onsemi's Electrical Characteristics table and applies across the full operating temperature range.
Can the MMSZ5235ET1G be used in automotive applications?
Yes-the MMSZ5235ET1G is not AEC-Q101 qualified in its base MMSZ prefix version, but the SZMMSZ5235ET1G variant is explicitly rated for automotive use, featuring unique site and control change requirements, PPAP capability, and qualification per AEC-Q101. For non-automotive designs, the MMSZ5235ET1G remains suitable for industrial and consumer applications meeting its −55 °C to +150 °C junction temperature range.
What is the maximum allowable soldering temperature for the MMSZ5235ET1G?
The MMSZ5235ET1G supports a maximum soldering temperature of 260 °C for up to 10 seconds, as specified in the Mechanical Characteristics section of the datasheet. This limit applies to both reflow and hand-soldering processes and ensures no internal damage or delamination occurs during PCB assembly.
How does the MMSZ5235ET1G behave under pulsed surge conditions?
The MMSZ5235ET1G is rated for 225 W nonrepetitive peak surge power with an 8 × 20 µs waveform at 25 °C ambient. Its ability to absorb such pulses stems from low thermal resistance (RJL = 150 °C/W) and optimized junction design-enabling reliable overvoltage clamping in transient-prone interfaces like USB, RS-485, or sensor inputs without degradation.
Is the MMSZ5235ET1G compatible with lead-free reflow profiles?
Yes-the "G" suffix in MMSZ5235ET1G denotes Pb-free construction, and the device is fully compatible with standard lead-free reflow profiles (e.g., JEDEC J-STD-020). Its thermosetting plastic case and corrosion-resistant finish withstand peak temperatures up to 260 °C for 10 seconds, satisfying IPC/JEDEC moisture sensitivity level (MSL) requirements for surface-mount assembly.
MMSZ5235ET1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- MMSZ52xxxT1G
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 6.8 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 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
MMSZ5235ET1G FAQ
1.How can I place an order for MMSZ5235ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5235ET1G 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 MMSZ5235ET1G reliable?
The price and inventory of MMSZ5235ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5235ET1G is usually 5 days.
3.What payment methods are accepted for MMSZ5235ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5235ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5235ET1G?
MMSZ5235ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5235ET1G 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 MMSZ5235ET1G?
For technical support, including MMSZ5235ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5235ET1G requirements.
6.How does Aetrix verify that MMSZ5235ET1G is sourced from the original manufacturer or authorized distributors?
All MMSZ5235ET1G 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 MMSZ5235ET1G meets industry standards.
7.What is the process for return or replacement of MMSZ5235ET1G?
All MMSZ5235ET1G units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5235ET1G, 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 MMSZ5235ET1G part is unused and in its original packaging.
Return procedure for MMSZ5235ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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