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onsemi SZBZX84C33ET3G
- Part No.:
- SZBZX84C33ET3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C33ET3G.pdf
- Description:
- DIODE ZENER 33V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
SZBZX84C33ET3G from onsemi is a 33 V, 250 mW Zener diode in SOT-23 package, designed for precision voltage regulation and reference applications with ±2 V tolerance at 5 mA test current, 80 Ω dynamic impedance, and −55 °C to +150 °C operating range-used in power supply feedback loops, overvoltage protection circuits, and voltage clamping in portable electronics.
For engineers reviewing the SZBZX84C33ET3G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, ESD robustness (Class 3, >16 kV HBM), junction-to-ambient thermal resistance (500 °C/W on FR-5), and automotive-grade qualification status per AEC-Q101.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown at nominal 33 V with temperature coefficient of +23.1 mV/°C at 5 mA. Its SOT-23 package features pin 1 (anode), pin 2 (no connection), and pin 3 (cathode), enabling unidirectional clamping with low capacitance (70 pF at 0 V, 1 MHz).
It supports transient suppression up to 225 W peak power (8 × 20 µs pulse), exhibits 0.05 µA max reverse leakage at 25 V, and maintains stable regulation across −55 °C to +150 °C ambient, with thermal derating starting at 2.0 mW/°C above 25 °C on FR-5 board.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 31 V min / 33 V nom / 35 V max @ IZT = 5 mA - defines regulation band for feedback or clamp design |
| Power Dissipation | 250 mW @ TA = 25 °C on FR-5 board - sets continuous DC load limit before thermal derating |
| Zener Impedance (ZZT) | 80 Ω max @ IZT = 5 mA - determines output voltage stability under varying load current |
| Reverse Leakage Current | 0.05 µA max @ VR = 25 V - ensures minimal quiescent current in high-impedance bias networks |
| Capacitance | 70 pF @ VR = 0 V, f = 1 MHz - impacts high-frequency noise filtering and signal integrity in RF-adjacent circuits |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - enables direct handling and board-level integration without added protection |
| Junction Temp Range | −55 °C to +150 °C - supports operation in automotive engine compartments and industrial control enclosures |
Pinout & Package
SOT-23 (TO-236) surface-mount plastic package, 2.90 mm × 1.30 mm × 1.00 mm, void-free thermosetting case with corrosion-resistant finish, UL 94 V-0 flammability rating, cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; must be held ≤33 V below cathode for regulation |
| 2 | No Connection | Internally isolated; no PCB trace or solder pad required - reduces layout complexity and parasitic coupling |
| 3 | Cathode | Connected to regulated voltage rail or reference point; polarity band aligns with this terminal |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including body control modules and infotainment power rails |
| Pb-Free & RoHS Compliant | Meets global environmental compliance requirements for industrial and consumer end equipment |
| 225 W Peak Pulse Handling | Withstands short-duration transients (e.g., ISO 7637-2 pulses) without degradation or failure |
| Low Capacitance (70 pF) | Minimizes signal distortion in high-speed data line clamping and EMI filtering applications |
| Thermal Derating Curve | Linear 2.0 mW/°C reduction above 25 °C enables accurate power budgeting in sealed enclosures |
Applications
| Power Supply Feedback | Overvoltage Protection |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback or buck-boost converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Precision voltage reference providing stable 33 V threshold for error amplifier comparison. Use Value: Maintains ±2% output accuracy across line/load/temperature with minimal external components. |
Use Scenario: Clamping input voltage to protect downstream LDOs or microcontrollers from surge events. IC Role / Device Role / Timing Role: Fast-acting shunt element diverting excess energy when input exceeds 33 V. Use Value: Limits transient overshoot to safe levels within 10 ns response time, preserving system reliability. |
| Reference Voltage Source | Portable Device Power Management |
|
Use Scenario: Generating stable bias voltage for ADC references or sensor excitation in battery-powered instrumentation. IC Role / Device Role / Timing Role: Low-drift Zener reference delivering 33 V with +23.1 mV/°C TC for calibration compensation. Use Value: Enables <1 LSB error drift over −40 °C to +85 °C without active temperature correction. |
Use Scenario: Providing regulated bias for RF front-end amplifiers and display backlight drivers in smartphones and wearables. IC Role / Device Role / Timing Role: Compact voltage clamp ensuring consistent gate drive or LED current despite battery sag. Use Value: Fits high-density layouts with SOT-23 footprint while sustaining 250 mW dissipation in thermally constrained spaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C33ET3G | Non-automotive grade; same electrical specs but lacks AEC-Q101 qualification and PPAP capability | Suitable for commercial/industrial designs where automotive reliability validation is not required | Select when cost sensitivity outweighs automotive qualification needs and supply chain allows non-SZ prefix |
| MMSZ4702T1G | 33 V nominal, 500 mW rating, SOD-123 package; higher power but larger footprint and 30 Ω ZZT | Better suited for higher-current regulation or less space-constrained boards requiring lower impedance | Choose when thermal margin is critical and board area permits 2.7 mm × 1.6 mm package instead of SOT-23 |
Compared with SZBZX84C33ET3G, BZX84C33ET3G offers identical regulation performance at lower qualification cost, while MMSZ4702T1G trades smaller size for higher power and lower impedance-making each optimal for distinct thermal, reliability, and layout constraints.
Availability
SZBZX84C33ET3G is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interfaces, and portable electronics requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZBZX84C33ET3G 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, and IoT applications, with emphasis on reliability and sustainability.
SZBZX84C33ET3G belongs to the BZX84CxxxETxG Zener regulator family, engineered for compact, high-reliability voltage reference and clamping in space- and thermal-constrained systems.
FAQ
What is the Zener voltage tolerance of SZBZX84C33ET3G at 5 mA test current?
The SZBZX84C33ET3G has a Zener voltage range of 31 V (minimum) to 35 V (maximum) at IZT = 5 mA, with 33 V as the nominal value. This ±2 V tolerance reflects manufacturing variation and must be accounted for in feedback loop gain and margin analysis. The device's temperature coefficient of +23.1 mV/°C further influences regulation accuracy across operating temperature ranges.
Is SZBZX84C33ET3G qualified for automotive applications?
Yes, SZBZX84C33ET3G is AEC-Q101 qualified and PPAP capable, meeting automotive reliability standards for stress testing, lifetime validation, and process control. The "SZ" prefix explicitly denotes automotive-grade screening and traceability, distinguishing it from commercial-grade BZX84C33ET3G variants that lack this qualification.
What is the maximum reverse leakage current for SZBZX84C33ET3G at 25 V?
The maximum reverse leakage current for SZBZX84C33ET3G is 0.05 µA at VR = 25 V and TA = 25 °C. This ultra-low leakage ensures minimal current draw in high-impedance reference networks and preserves battery life in always-on portable systems where standby power is critical.
How does thermal derating affect the power handling of SZBZX84C33ET3G on FR-5 board?
SZBZX84C33ET3G dissipates 250 mW at 25 °C ambient on FR-5 board, with linear derating of 2.0 mW/°C above that temperature. At 75 °C ambient, its usable power drops to 150 mW. Designers must calculate worst-case junction temperature using RJA = 500 °C/W to avoid exceeding the +150 °C absolute maximum junction rating.
What is the pin configuration and polarity marking for SZBZX84C33ET3G?
SZBZX84C33ET3G uses SOT-23 package with pin 1 = anode, pin 2 = no connection (unbonded), pin 3 = cathode. The cathode is marked by a visible polarity band adjacent to pin 3. This configuration ensures correct orientation during automated placement and prevents reverse-bias misconnection in shunt regulator circuits.
SZBZX84C33ET3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±6%
- Power - Max:
- 225 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:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZBZX84C33ET3G FAQ
1.How can I place an order for SZBZX84C33ET3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C33ET3G 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 SZBZX84C33ET3G reliable?
The price and inventory of SZBZX84C33ET3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C33ET3G is usually 5 days.
3.What payment methods are accepted for SZBZX84C33ET3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C33ET3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C33ET3G?
SZBZX84C33ET3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C33ET3G 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 SZBZX84C33ET3G?
For technical support, including SZBZX84C33ET3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C33ET3G requirements.
6.How does Aetrix verify that SZBZX84C33ET3G is sourced from the original manufacturer or authorized distributors?
All SZBZX84C33ET3G 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 SZBZX84C33ET3G meets industry standards.
7.What is the process for return or replacement of SZBZX84C33ET3G?
All SZBZX84C33ET3G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C33ET3G, 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 SZBZX84C33ET3G part is unused and in its original packaging.
Return procedure for SZBZX84C33ET3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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