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onsemi MMSZ33T1
- Part No.:
- MMSZ33T1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ33T1.pdf
- Description:
- DIODE ZENER 33V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,624
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Product details
Overview
MMSZ33T1G 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, 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 and power management circuits.
For engineers reviewing the MMSZ33T1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, AEC−Q101 qualification status, ESD robustness (Class 3, >16 kV HBM), and real-world use cases in automotive sensor signal conditioning and industrial voltage monitoring.
Technical Context
This device operates as a two-terminal silicon Zener diode optimized for stable reverse-bias regulation. Its nominal 33 V breakdown voltage is specified at IZT = 2 mA with ±5% tolerance, and its temperature coefficient is +14.5 mV/°C near 33 V - confirmed by Figure 1 and typical TC curves in the datasheet.
Thermal performance is defined by RJA = 340 °C/W and RJL = 150 °C/W, enabling reliable operation across −55°C to +150°C junction temperature range. The SOD−123 package supports automated placement and meets UL 94 V−0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 31.35 V min / 33 V nom / 34.65 V max at IZT = 2 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation (PD) | 500 mW on FR−5 board at TL = 75°C - sets maximum continuous power handling before thermal derating begins |
| Zener Impedance (ZZT) | ≤80 Ω at IZT = 2 mA, f = 1 kHz - determines AC regulation stability and ripple rejection capability |
| Reverse Leakage (IR) | ≤0.05 μA at VR = 23.1 V - ensures minimal standby current in clamping or reference applications |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - guarantees robustness against handling and board-level electrostatic discharge |
| Temperature Range | −55°C to +150°C junction/storage - supports operation in under-hood automotive and industrial environments |
| AEC−Q101 Qualified | Yes - validated for automotive-grade reliability including stress testing and PPAP documentation readiness |
Pinout & Package
SOD−123 plastic surface-mount package (Case 425, 1.60 × 2.69 × 1.16 mm), cathode indicated by polarity band; designed for high-density PCB layouts and reflow-compatible assembly.
| 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 circuit ground or lower potential; completes bias path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables use in higher-current reference or transient suppression roles without external heat sinking on standard FR−5 boards |
| ±5% Zener Voltage Tolerance | Provides predictable regulation accuracy suitable for non-critical voltage references and overvoltage protection thresholds |
| Class 3 ESD Robustness | Eliminates need for additional ESD protection components in exposed I/O or sensor interface circuits |
| AEC−Q101 Qualification | Validates long-term reliability for automotive applications including body electronics and ADAS sensor modules |
| Pb−Free Construction | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) |
Applications
| Automotive Sensor Reference | Industrial Power Rail Clamp |
|---|---|
Use Scenario: Providing stable 33 V reference for analog front-end of engine coolant temperature sensor in passenger vehicle ECUs. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to fix reference voltage for ADC input scaling. Use Value: Maintains <±1% reference drift over −40°C to +125°C ambient due to matched TC and AEC−Q101 validation. | Use Scenario: Clamping 36 V supply rail in factory automation PLC I/O module to protect downstream LDOs from overvoltage transients. IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing surge energy above 33 V threshold. Use Value: Limits rail excursion to ≤34.65 V (max VZ) while dissipating up to 500 mW peak pulse energy per MIL-STD-1275B compliance tests. |
| Medical Instrument Voltage Monitor | Consumer IoT Battery Protection |
Use Scenario: Monitoring 33 V intermediate bus in portable ultrasound battery pack to trigger low-voltage shutdown before cell depletion. IC Role / Device Role / Timing Role: Precision Zener used as comparator input threshold in discrete undervoltage detection circuit. Use Value: Delivers repeatable 33 V trip point with ≤0.05 μA leakage, minimizing quiescent current drain on Li-ion cells. | Use Scenario: Overvoltage protection for USB-C PD negotiation circuitry in smart home hub, limiting VBUS to safe levels during fault conditions. IC Role / Device Role / Timing Role: Fast-response shunt clamp activated when VBUS exceeds 33 V nominal. Use Value: Responds within nanoseconds to transient spikes and withstands 16 kV HBM ESD events without degradation. |
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-C33 | Same 33 V nominal Zener voltage, but SOT−23 package (higher RJA = 375 °C/W) and 300 mW rating | Lower power handling limits use in sustained-clamp scenarios; less suitable for automotive under-hood thermal profiles | Select when board space allows SOT−23 and thermal load remains below 300 mW |
| 1N4743A | Through-hole DO−41 package, 1 W rating, ±5% tolerance, 25 Ω ZZT at 31 mA - significantly lower impedance but larger footprint | Requires PCB through-hole mounting and cannot support automated SMT production | Choose for prototyping or legacy designs where manual assembly and higher surge capacity are acceptable |
Compared with BZX84-C33 and 1N4743A, the MMSZ33T1G offers optimal balance of SMT compatibility, AEC−Q101 qualification, and 500 mW power density in the compact SOD−123 form factor - making it preferred for volume automotive and industrial surface-mount designs requiring regulatory compliance and thermal resilience.
Availability
MMSZ33T1G is available at Aetrix Electronics and suitable for automotive sensor reference, industrial power rail clamp, and medical instrument voltage monitor applications requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for MMSZ33T1G 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMSZxxxT1G series is part of onsemi's precision Zener regulator portfolio, engineered for high-reliability voltage reference and overvoltage protection in space-constrained, thermally demanding environments.
FAQ
What is the exact Zener voltage tolerance for MMSZ33T1G?
The MMSZ33T1G 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 when tested at IZT = 2 mA and TA = 25°C. This tolerance is explicitly stated in Notes 3 and 6 of the onsemi datasheet and applies to all units in the MMSZ33T1G production lot.
Is MMSZ33T1G qualified for automotive use?
Yes, the MMSZ33T1G is AEC−Q101 qualified and PPAP capable, confirming its suitability for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. The qualification covers temperature cycling, humidity testing, and mechanical shock per AEC standards - fully documented in onsemi's certification reports.
What is the maximum reverse leakage current for MMSZ33T1G at 23.1 V?
The maximum reverse leakage current for MMSZ33T1G is 0.05 μA when biased at VR = 23.1 V (70% of nominal VZ), as specified in the Electrical Characteristics table on page 3 of the datasheet. This value is measured at TA = 25°C and confirms low standby power consumption in voltage-monitoring circuits.
Does MMSZ33T1G have Pb−free construction?
Yes, MMSZ33T1G is Pb−free and RoHS compliant, indicated by the "G" suffix in the part number and confirmed in the Ordering Information section. It meets JEDEC J-STD-020 moisture sensitivity level 1 and supports lead-free reflow soldering profiles up to 260°C for 10 seconds.
What is the thermal resistance from junction to ambient for MMSZ33T1G?
The thermal resistance from junction to ambient (RJA) for MMSZ33T1G is 340 °C/W, measured on FR−5 board using the infrared scan method per Note 2 in the Maximum Ratings table. This value governs steady-state thermal derating and must be applied when operating above 75°C board temperature.
MMSZ33T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ33T1 FAQ
1.How can I place an order for MMSZ33T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ33T1 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 MMSZ33T1 reliable?
The price and inventory of MMSZ33T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ33T1 is usually 5 days.
3.What payment methods are accepted for MMSZ33T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ33T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ33T1?
MMSZ33T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ33T1 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 MMSZ33T1?
For technical support, including MMSZ33T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ33T1 requirements.
6.How does Aetrix verify that MMSZ33T1 is sourced from the original manufacturer or authorized distributors?
All MMSZ33T1 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 MMSZ33T1 meets industry standards.
7.What is the process for return or replacement of MMSZ33T1?
All MMSZ33T1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ33T1, 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 MMSZ33T1 part is unused and in its original packaging.
Return procedure for MMSZ33T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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