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onsemi SZBZX84C33ET1G
- Part No.:
- SZBZX84C33ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C33ET1G.pdf
- Description:
- DIODE ZENER 33V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:32,797
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Product details
Overview
SZBZX84C33ET1G from onsemi is a 33 V, ±5% tolerance Zener diode in SOT-23 package, rated for 250 mW power dissipation on FR-5 board at 25°C, with 80 Ω dynamic impedance at 5 mA test current and 0.05 µA reverse leakage at 25.2 V. It provides precision voltage regulation in space-constrained portable electronics.
For engineers reviewing the SZBZX84C33ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal coefficient (+27.4 mV/°C), junction temperature range (−65°C to +150°C), and AEC-Q101 qualification for automotive use.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its nominal Zener voltage of 33 V is specified at 5 mA test current (IZT1), with dynamic impedance measured at 80 Ω under same conditions. Temperature coefficient is +27.4 mV/°C, indicating positive drift with rising temperature.
The SOT-23 package features cathode-indicated polarity band, void-free thermosetting plastic case, UL 94 V-0 flammability rating, and 260°C maximum soldering temperature for 10 seconds. Pin 2 is internally unconnected - only pins 1 (anode) and 3 (cathode) are electrically active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 33 V nominal, 31–35 V min/max at 5 mA - defines stable regulation point for biasing or clamping circuits |
| Power Dissipation | 250 mW on FR-5 board at 25°C - sets maximum continuous DC power handling before thermal derating applies |
| Dynamic Impedance | 80 Ω at 5 mA - determines output voltage stability under varying load current |
| Reverse Leakage | 0.05 µA at 25.2 V - ensures minimal quiescent current in high-impedance reference paths |
| Temperature Coefficient | +27.4 mV/°C at 5 mA - quantifies voltage drift per degree Celsius for thermal design margining |
| Junction Temp Range | −65°C to +150°C - supports operation in automotive under-hood and industrial environments |
| ESD Rating | Class 3 (>16 kV HBM) - enables robust handling during automated assembly without special ESD controls |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 × 1.30 × 1.00 mm, with cathode indicated by polarity band. Void-free thermosetting plastic case, corrosion-resistant finish, UL 94 V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward-biased terminal; connects to lower-potential node in regulation path |
| 2 | No Connection | Internally isolated; must remain unconnected on PCB to avoid parasitic coupling |
| 3 | Cathode | Zener breakdown terminal; connects to higher-potential node and defines regulated output reference |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and body electronics |
| Pb-Free & RoHS Compliant | Meets global environmental compliance requirements for industrial and consumer production |
| 225 W Peak Pulse Power | Withstands transient overvoltage events (8 × 20 µs waveform) without degradation |
| Small SOT-23 Footprint | Enables high-density PCB layouts in handheld portables and wearable devices |
| Class 3 ESD Robustness | Eliminates need for external ESD protection in low-energy signal conditioning stages |
Applications
| Automotive Sensor Biasing | Portable Device Voltage Clamp |
|---|---|
Use Scenario: Providing stable 33 V reference for analog front-end amplifiers in engine knock sensors. IC Role / Device Role / Timing Role: Zener voltage reference establishing precise bias point for signal conditioning circuitry. Use Value: Maintains sensor accuracy across −40°C to +125°C ambient with <±0.5% regulation error due to tight 31–35 V tolerance. |
Use Scenario: Clamping surge transients on USB power rails in Bluetooth headsets. IC Role / Device Role / Timing Role: Overvoltage protection element limiting rail voltage to 35 V peak during ESD events. Use Value: Absorbs 225 W pulse energy without failure, preserving downstream LDOs and PMICs. |
| Industrial PLC Input Protection | Medical Instrument Reference |
Use Scenario: Protecting 24 V digital input channels against field-wiring induced surges. IC Role / Device Role / Timing Role: Shunt regulator clamping transient voltages above 35 V to ground. Use Value: Enables >16 kV HBM ESD immunity and withstands repeated 8 × 20 µs pulses per IEC 61000-4-5. |
Use Scenario: Generating stable 33 V reference for ADC voltage dividers in portable ECG monitors. IC Role / Device Role / Timing Role: Precision voltage reference defining full-scale input range for analog-to-digital conversion. Use Value: Low 0.05 µA leakage prevents loading of high-impedance biopotential sensor nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C33ET1G | Non-automotive grade; lacks AEC-Q101 qualification and PPAP capability; identical electrical specs and SOT-23 package | Suitable for commercial-grade consumer electronics but not automotive Tier-1 supply chains | Select when cost sensitivity outweighs automotive qualification requirements |
| MMSZ5261BT1G | Same 33 V nominal Zener voltage but 500 mW power rating; 30 Ω dynamic impedance at 20 mA; different SOD-123 package | Higher power handling enables use in higher-current regulation; larger footprint limits ultra-dense layouts | Choose for applications requiring >250 mW continuous dissipation or lower impedance at higher currents |
Compared with SZBZX84C33ET1G, BZX84C33ET1G offers identical regulation performance without automotive validation, while MMSZ5261BT1G trades smaller size for higher power and lower impedance - making SZBZX84C33ET1G optimal for AEC-Q101-compliant, space-constrained designs needing 250 mW capability.
Availability
SZBZX84C33ET1G is available at Aetrix Electronics and suitable for automotive sensor modules, portable medical devices, and industrial PLC input protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZBZX84C33ET1G 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
SZBZX84C33ET1G belongs to the BZX84CxxxET1G/SZBZX84CxxxET1G Zener regulator family, engineered specifically for compact, high-reliability voltage reference and transient suppression in automotive and portable electronics.
FAQ
What is the Zener voltage tolerance of SZBZX84C33ET1G?
The SZBZX84C33ET1G has a Zener voltage tolerance of ±5% around its nominal 33 V rating, meaning the actual breakdown voltage falls between 31 V and 35 V when tested at 5 mA (IZT1). This tolerance is guaranteed across the full operating temperature range and is critical for precision reference applications where regulation accuracy directly impacts system performance.
Is SZBZX84C33ET1G qualified for automotive use?
Yes, SZBZX84C33ET1G is AEC-Q101 qualified and PPAP capable, confirming its suitability for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. The "SZ" prefix explicitly denotes automotive-grade manufacturing controls, site-specific change management, and enhanced reliability testing beyond standard commercial parts.
What is the function of Pin 2 on SZBZX84C33ET1G?
Pin 2 of the SZBZX84C33ET1G is a no-connect terminal - it is internally unconnected and must remain unattached on the PCB. This configuration is confirmed in the official datasheet's marking diagram and mechanical outline (Style 8), where only Pins 1 (anode) and 3 (cathode) carry electrical functionality.
How does the temperature coefficient affect SZBZX84C33ET1G performance?
The SZBZX84C33ET1G exhibits a positive temperature coefficient of +27.4 mV/°C at 5 mA, meaning its Zener voltage increases linearly with junction temperature. This behavior must be accounted for in high-precision references; for example, a 50°C rise causes ~1.37 V increase in regulation voltage, requiring thermal compensation or layout isolation in sensitive analog circuits.
What is the maximum reverse leakage current for SZBZX84C33ET1G?
The maximum reverse leakage current for SZBZX84C33ET1G is 0.05 µA at VR = 25.2 V (80% of nominal Zener voltage), measured at 25°C ambient. This ultra-low leakage ensures minimal current draw in high-impedance bias networks and preserves battery life in always-on portable systems where the SZBZX84C33ET1G serves as a reference or clamp.
SZBZX84C33ET1G 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)
SZBZX84C33ET1G FAQ
1.How can I place an order for SZBZX84C33ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C33ET1G 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 SZBZX84C33ET1G reliable?
The price and inventory of SZBZX84C33ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C33ET1G is usually 5 days.
3.What payment methods are accepted for SZBZX84C33ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C33ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C33ET1G?
SZBZX84C33ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C33ET1G 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 SZBZX84C33ET1G?
For technical support, including SZBZX84C33ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C33ET1G requirements.
6.How does Aetrix verify that SZBZX84C33ET1G is sourced from the original manufacturer or authorized distributors?
All SZBZX84C33ET1G 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 SZBZX84C33ET1G meets industry standards.
7.What is the process for return or replacement of SZBZX84C33ET1G?
All SZBZX84C33ET1G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C33ET1G, 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 SZBZX84C33ET1G part is unused and in its original packaging.
Return procedure for SZBZX84C33ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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