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onsemi MMSZ33T3G
- Part No.:
- MMSZ33T3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ33T3G.pdf
- Description:
- DIODE ZENER 33V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:200,000
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Product details
Overview
MMSZ33T3G from onsemi is a 33 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 80 Ω maximum dynamic impedance at 2 mA test current and 0.05 µA reverse leakage at 23.1 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog sensing and power rail stabilization circuits.
For engineers reviewing the MMSZ33T3G datasheet, pinout, applications, or equivalent options, key selection criteria include its 33 V nominal Zener voltage with ±5% tolerance, 80 Ω dynamic impedance at IZT = 2 mA, Class 3 ESD rating (>16 kV HBM), AEC−Q101 qualification, and Pb−Free SOD−123 packaging compatible with automated assembly.
Technical Context
The MMSZ33T3G operates as a two-terminal silicon Zener diode, conducting in reverse breakdown to maintain stable voltage across its terminals when biased above VZ. Its Zener voltage is specified at 33 V (min 31.35 V, max 34.65 V) with 5% tolerance, measured under 1 ms pulse width at IZT = 2 mA. Temperature coefficient is positive and increases with nominal VZ, consistent with devices above ~6 V.
Thermal performance is defined by RJA = 340 °C/W and RJL = 150 °C/W, enabling operation from −55°C to +150°C junction temperature. The device exhibits 0.05 µA reverse leakage at VR = 23.1 V and forward voltage ≤0.9 V at IF = 10 mA, supporting bidirectional signal conditioning where needed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V nominal, ±5% tolerance (31.35–34.65 V); sets precise clamping/reference level in feedback or protection paths |
| Power Dissipation (PD) | 500 mW at TL = 75°C on FR−5 board; derates 6.7 mW/°C above 75°C for thermal design margin |
| Zener Impedance (ZZT) | 80 Ω max at IZT = 2 mA; determines voltage regulation stability under varying load current |
| Reverse Leakage (IR) | 0.05 µA max at VR = 23.1 V; ensures minimal quiescent current in high-impedance bias networks |
| ESD Rating | Class 3 (>16 kV) per Human Body Model; supports robust handling in automated SMT lines without added protection |
| Package | SOD−123 (Case 425), Pb−Free; footprint measures 2.54–2.84 mm × 1.40–1.80 mm × 0.94–1.35 mm for high-density PCB layout |
| AEC−Q101 Qualified | Validated for automotive applications requiring PPAP documentation and controlled manufacturing site traceability |
Pinout & Package
SOD−123 surface-mount plastic package with cathode indicated by polarity band; void-free thermosetting case, UL 94 V−0 flammability rating, and corrosion-resistant solderable finish. Maximum soldering temperature is 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener breakdown terminal | Connected to higher-potential node in reverse-bias configuration; carries regulated output voltage referenced to anode |
| 2 (Anode) | Reference/ground terminal | Typically tied to system ground or lower-potential rail; completes Zener conduction path during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW power rating on FR−5 board | Enables use in space-constrained, low-to-moderate power regulation without heatsinking |
| ±5% Zener voltage tolerance | Supports predictable clamping thresholds in cost-sensitive industrial and automotive systems |
| Class 3 ESD immunity (>16 kV HBM) | Reduces need for external ESD protection in front-end analog interfaces and sensor inputs |
| AEC−Q101 qualification | Meets automotive reliability standards for under-hood and infotainment subsystems |
| Pb−Free SOD−123 package | Complies with RoHS and ELV directives while maintaining compatibility with standard reflow profiles |
Applications
| Voltage Reference for ADC Biasing | Overvoltage Clamp in Sensor Interface |
|---|---|
Use Scenario: Providing stable 33 V reference to bias op-amp input stages feeding 12-bit+ SAR ADCs in industrial data acquisition modules. IC Role / Device Role / Timing Role: Precision shunt reference establishing known DC offset and common-mode voltage for differential input amplifiers. Use Value: Maintains <±0.5% reference drift over −40°C to +85°C due to tight 5% VZ tolerance and predictable TC behavior above 6 V. | Use Scenario: Protecting 3.3 V or 5 V microcontroller GPIO pins from transient surges on 24 V supply rails in factory automation sensors. IC Role / Device Role / Timing Role: Fast-acting shunt clamp diverting excess energy to ground before IC damage occurs. Use Value: Limits peak voltage to ≤34.65 V with sub-µA leakage, preserving signal integrity and eliminating need for series resistors in low-bandwidth paths. |
| Power Rail Stabilization in Low-Power IoT Nodes | Feedback Element in Isolated Flyback Regulators |
Use Scenario: Stabilizing auxiliary 12 V bias rail derived from energy-harvesting sources in batteryless wireless sensor nodes. IC Role / Device Role / Timing Role: Passive voltage regulator maintaining constant headroom for LDOs or gate drivers under variable load conditions. Use Value: Delivers 500 mW dissipation capability in 2.7 mm² footprint, enabling compact designs without active regulation overhead. | Use Scenario: Setting output voltage in optocoupler-based feedback loops of 5–15 W isolated AC/DC flyback converters for smart home controllers. IC Role / Device Role / Timing Role: Secondary-side Zener defining regulation threshold that controls optocoupler LED current and thus primary-side PWM duty cycle. Use Value: Ensures ±5% output accuracy across line/load variations, leveraging tight VZ tolerance and low dynamic impedance (80 Ω) for stable loop response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B33,115 | Same 33 V ±5% VZ, but 300 mW rating and SOD-323 package (smaller footprint, lower power handling) | Preferred for ultra-compact layouts where 300 mW suffices; not suitable for sustained 500 mW dissipation | Select BZX384-B33,115 only if board area is critical and thermal budget allows reduced power rating |
| SZMMBZ33VALT1G | Same 33 V ±5% VZ, 500 mW rating, but SOT-23 package (3-pin, anode/cathode/anode) and dual-anode configuration | Offers dual-Zener topology for bidirectional clamping; requires different PCB layout and routing | Choose SZMMBZ33VALT1G only when symmetrical transient suppression (e.g., RS-485 bus) is required |
Compared with BZX384-B33,115 and SZMMBZ33VALT1G, the MMSZ33T3G provides the optimal balance of 500 mW power handling, SOD−123 manufacturability, and single-diode simplicity for unidirectional voltage reference and clamp functions in automotive and industrial designs.
Availability
MMSZ33T3G is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, and IoT edge-node power management requiring stable component supply and AEC−Q101 compliance.
Supply support for MMSZ33T3G 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 focused on energy-efficient innovation for automotive, industrial, cloud, and intelligent edge applications.
The MMSZxxxT1G Series is designed for surface-mount Zener regulation in space-constrained, high-reliability systems-emphasizing AEC−Q101 qualification, Pb−Free compliance, and automated assembly readiness.
FAQ
What is the Zener voltage tolerance of the MMSZ33T3G?
The MMSZ33T3G has a nominal Zener voltage of 33 V with a standard tolerance of ±5%, resulting in a guaranteed range of 31.35 V to 34.65 V at IZT = 2 mA and TA = 25°C. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official datasheet and applies across the full operating temperature range.
Is the MMSZ33T3G suitable for automotive applications?
Yes, the MMSZ33T3G is AEC−Q101 qualified and PPAP capable, making it suitable for automotive applications including body electronics, infotainment power supplies, and sensor interface protection. Its SOD−123 package, Class 3 ESD rating, and −55°C to +150°C junction temperature range meet stringent automotive reliability requirements.
What is the maximum power dissipation of the MMSZ33T3G and how does it derate with temperature?
The MMSZ33T3G is rated for 500 mW total power dissipation on FR−5 board at lead temperature (TL) = 75°C. Above 75°C, it derates linearly at 6.7 mW/°C. This derating curve is defined in the Maximum Ratings table and must be applied in thermal design to ensure junction temperature remains within −55°C to +150°C limits.
Does the MMSZ33T3G have a Pb−Free package?
Yes, the "T3G" suffix in MMSZ33T3G explicitly denotes a Pb−Free SOD−123 package compliant with RoHS and ELV directives. The datasheet confirms Pb−Free construction in the Ordering Information section and references the ON Semiconductor Soldering and Mounting Techniques Reference Manual for reflow profile guidance.
What is the reverse leakage current specification for the MMSZ33T3G?
The MMSZ33T3G specifies a maximum reverse leakage current (IR) of 0.05 µA at VR = 23.1 V and TA = 25°C. This value is listed in the Electrical Characteristics table on page 3 and reflects the device's ability to minimize standby current in high-impedance reference or bias networks.
MMSZ33T3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 23.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ33T3G FAQ
1.How can I place an order for MMSZ33T3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ33T3G 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 MMSZ33T3G reliable?
The price and inventory of MMSZ33T3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ33T3G is usually 5 days.
3.What payment methods are accepted for MMSZ33T3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ33T3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ33T3G?
MMSZ33T3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ33T3G 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 MMSZ33T3G?
For technical support, including MMSZ33T3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ33T3G requirements.
6.How does Aetrix verify that MMSZ33T3G is sourced from the original manufacturer or authorized distributors?
All MMSZ33T3G 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 MMSZ33T3G meets industry standards.
7.What is the process for return or replacement of MMSZ33T3G?
All MMSZ33T3G units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ33T3G, 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 MMSZ33T3G part is unused and in its original packaging.
Return procedure for MMSZ33T3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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