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onsemi SZBZX84C33LT3G
- Part No.:
- SZBZX84C33LT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C33LT3G.pdf
- Description:
- DIODE ZENER 33V 250MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:19,800
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Product details
Overview
SZBZX84C33LT3G from onsemi is a 33 V ±5% Zener diode in SOT-23 package, rated for 250 mW power dissipation at 25°C on FR-5 board, with 80 Ω dynamic impedance at 5 mA test current and 55 μA maximum reverse leakage at 24.8 V. It serves as a precision voltage reference or overvoltage clamp in low-power portable electronics.
For engineers reviewing the SZBZX84C33LT3G datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance (±5%), thermal coefficient (+23.1 mV/°C), junction-to-ambient thermal resistance (500 °C/W), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This device operates in reverse-biased breakdown mode with a nominal Zener voltage of 33 V at 5 mA test current, exhibiting a positive temperature coefficient of +23.1 mV/°C. Its 80 Ω dynamic impedance at IZT = 5 mA ensures stable regulation under moderate load transients.
The SOT-23 package features three terminals: anode (Pin 1), no connection (Pin 2), and cathode (Pin 3), with cathode polarity marked by a band. It supports automated assembly and meets Class 3 ESD rating (>16 kV HBM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 31 V to 35 V at 5 mA - defines regulated output range for reference or clamping |
| Power Dissipation | 250 mW on FR-5 board - limits continuous operating current to ~7.6 mA at 33 V |
| Zener Impedance | 80 Ω at 5 mA - determines output voltage deviation under 1 mA load change |
| Reverse Leakage | 55 μA max at 24.8 V - sets minimum bias current needed to maintain regulation |
| Temperature Coefficient | +23.1 mV/°C - indicates voltage increases ~0.76 V over 33°C ambient rise |
| Capacitance | 70 pF at 0 V, 1 MHz - impacts high-frequency noise filtering capability |
| ESD Rating | Class 3 (>16 kV HBM) - enables robust handling in manual assembly and field environments |
Pinout & Package
SOT-23 (TO-236) surface-mount plastic package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting case with corrosion-resistant finish; cathode indicated by polarity band; Pb-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; must be held ≤33 V below cathode to avoid conduction |
| 2 | No Connection | Internally unconnected; no PCB trace or solder joint required |
| 3 | Cathode | Connected to regulated voltage rail or clamping node; polarity band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and body electronics |
| ±5% Zener Tolerance | Enables predictable voltage clamping without post-production trimming |
| 250 mW Power Rating | Supports regulation in space-constrained battery-powered devices like wearables and IoT sensors |
| Class 3 ESD Protection | Eliminates need for external ESD protection in handheld product front-end circuits |
| Pb-Free & RoHS Compliant | Meets global environmental compliance requirements for industrial and consumer shipments |
Applications
| USB Port Overvoltage Protection | Automotive Cabin Controller Reference |
|---|---|
Use Scenario: Clamps transient surges on 5 V USB data/power lines during hot-plug events or ESD discharge. IC Role / Device Role / Timing Role: Passive voltage clamp placed between VBUS and GND, conducting only above 33 V threshold. Use Value: Prevents damage to downstream USB transceivers by limiting peak voltage to ≤35 V with <80 Ω dynamic impedance. |
Use Scenario: Provides stable 33 V reference for analog sensor signal conditioning in HVAC or infotainment control units. IC Role / Device Role / Timing Role: Two-terminal shunt regulator supplying bias to op-amp input stages or ADC reference dividers. Use Value: Maintains ±5% accuracy across −40°C to +125°C ambient with +23.1 mV/°C TC compensated in system firmware. |
| Smartphone Battery Monitoring Circuit | Industrial PLC Input Protection |
Use Scenario: Protects fuel gauge IC inputs from overvoltage during battery pack fault conditions or charger misconnection. IC Role / Device Role / Timing Role: Zener clamp connected between battery sense line and ground, activated only during >33 V faults. Use Value: Limits sensed voltage to safe range for 3.3 V microcontroller ADC inputs while drawing <55 μA leakage at normal operation. |
Use Scenario: Shields 24 V digital input channels from induced surges on factory floor wiring harnesses. IC Role / Device Role / Timing Role: Front-end shunt element in optocoupler-isolated input stage, clamping transients before current-limiting resistor. Use Value: Absorbs 250 mW surge energy without degradation, enabling reliable operation in EN 61000-4-5 Level 3 environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C33LT3G | Standard tolerance (±5%), same SOT-23 package and 33 V nominal, but lacks AEC-Q101 qualification | Approved for commercial-grade portable electronics only; not suitable for automotive production | Select when cost sensitivity outweighs automotive qualification requirements |
| SZBZX84C33LT1G | Identical electrical specs and AEC-Q101 qualification, but supplied in 3,000-piece tape-and-reel vs. 10,000-piece for SZBZX84C33LT3G | Preferred for low-volume prototyping or small-batch builds where reel size impacts inventory turnover | Choose for engineering validation or pilot production runs requiring smaller packaging increments |
Compared with BZX84C33LT3G and SZBZX84C33LT1G, the SZBZX84C33LT3G offers identical regulation performance and automotive qualification while optimizing for high-volume manufacturing via larger 10,000-unit reels-reducing changeover frequency and material handling cost per unit.
Availability
SZBZX84C33LT3G is available at Aetrix Electronics and suitable for USB port protection, automotive cabin controllers, smartphone battery monitoring, and industrial PLC input protection requiring stable component supply and AEC-Q101 compliance.
Supply support for SZBZX84C33LT3G 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 power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The SZBZX84CxxxLTxG series is part of onsemi's automotive-qualified Zener diode portfolio, designed specifically for voltage reference and overvoltage protection in harsh-environment electronic control units.
FAQ
What is the Zener voltage tolerance of SZBZX84C33LT3G?
The SZBZX84C33LT3G has a nominal Zener voltage of 33 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 31.0 V and 35.0 V when tested at 5 mA. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the onsemi datasheet, under the BZX84CxxxLT1 series column for device marking Y12.
Is SZBZX84C33LT3G qualified for automotive use?
Yes, SZBZX84C33LT3G is AEC-Q101 qualified and PPAP capable, as explicitly stated in the Features section of the onsemi datasheet. The "SZ" prefix denotes compliance with automotive-specific site and process controls, making it suitable for deployment in engine control units, body electronics, and ADAS subsystems.
What is the thermal resistance of SZBZX84C33LT3G on FR-5 board?
The junction-to-ambient thermal resistance (RJA) of SZBZX84C33LT3G is 500 °C/W when mounted on FR-5 board, per the Maximum Ratings table on page 2 of the datasheet. This value governs temperature rise: at 250 mW dissipation, junction temperature rises 125°C above ambient, limiting continuous operation in high-temperature environments.
Does SZBZX84C33LT3G have a no-connect pin, and how is it identified?
Yes, SZBZX84C33LT3G has Pin 2 designated as "No Connection", as confirmed in the Pinout diagrams on pages 2 and 6 of the datasheet and the Mechanical Case Outline on page 7. This terminal is internally unconnected and must remain un-soldered on the PCB to avoid unintended parasitic paths or mechanical stress.
What is the maximum reverse leakage current for SZBZX84C33LT3G?
The maximum reverse leakage current for SZBZX84C33LT3G is 55 μA at 24.8 V (75% of nominal Zener voltage), as specified in the Electrical Characteristics table on page 3. This parameter ensures minimal quiescent current draw in standby mode while maintaining reliable turn-on behavior at the rated breakdown voltage.
SZBZX84C33LT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- SZBZX84CxxxLT1G
- 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:
- 250 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)
SZBZX84C33LT3G FAQ
1.How can I place an order for SZBZX84C33LT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C33LT3G 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 SZBZX84C33LT3G reliable?
The price and inventory of SZBZX84C33LT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C33LT3G is usually 5 days.
3.What payment methods are accepted for SZBZX84C33LT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C33LT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C33LT3G?
SZBZX84C33LT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C33LT3G 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 SZBZX84C33LT3G?
For technical support, including SZBZX84C33LT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C33LT3G requirements.
6.How does Aetrix verify that SZBZX84C33LT3G is sourced from the original manufacturer or authorized distributors?
All SZBZX84C33LT3G 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 SZBZX84C33LT3G meets industry standards.
7.What is the process for return or replacement of SZBZX84C33LT3G?
All SZBZX84C33LT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C33LT3G, 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 SZBZX84C33LT3G part is unused and in its original packaging.
Return procedure for SZBZX84C33LT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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