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onsemi SZBZX84C3V3ET1G
- Part No.:
- SZBZX84C3V3ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C3V3ET1G.pdf
- Description:
- DIODE ZENER 3.3V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,708
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Product details
Overview
SZBZX84C3V3ET1G from onsemi is a 3.3 V ±0.2 V Zener diode in SOT-23 package, rated for 250 mW power dissipation at 25°C on FR-5 board, with 95 Ω dynamic impedance at 5 mA test current and 5 µA maximum reverse leakage at 1 V reverse voltage - used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the SZBZX84C3V3ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±0.2 V), thermal coefficient (−3.5 mV/°C), ESD rating (>16 kV HBM), peak pulse power (225 W), 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, with nominal Zener voltage of 3.3 V measured at IZT = 5 mA under 25°C ambient. Its temperature coefficient of −3.5 mV/°C indicates decreasing voltage with rising temperature - critical for biasing circuits requiring stable reference across −65°C to +150°C junction range.
The SOT-23 package features cathode-indicated polarity band, void-free thermosetting plastic case rated UL 94 V-0, and 260°C soldering tolerance for 10 seconds. Pin 2 is internally unconnected, confirming true two-terminal operation without parasitic paths or control pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 3.1–3.5 V @ 5 mA - ensures ±0.2 V regulation window for 3.3 V rail clamping |
| Power Dissipation | 250 mW @ 25°C on FR-5 - defines max continuous DC power before thermal derating begins |
| Zener Impedance | 95 Ω @ 5 mA - limits output voltage variation under load current changes |
| Reverse Leakage | 5 µA @ 1 V - determines quiescent current draw in standby mode |
| ESD Rating | Class 3 (>16 kV HBM) - protects against electrostatic discharge during handling and assembly |
| Peak Pulse Power | 225 W @ 8 × 20 µs - supports transient surge suppression per IEC 61000-4-5 |
| Junction Temp Range | −65°C to +150°C - enables operation in under-hood automotive and industrial environments |
Pinout & Package
SOT-23 (TO-236) surface-mount package: 2.90 mm × 1.30 mm × 1.00 mm body, 1.90 mm lead pitch, void-free thermosetting plastic case with corrosion-resistant finish and UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward-biased terminal; connects to lower-potential node in reverse-bias regulation configuration |
| 2 | No Connection | Internally isolated; no electrical function - must remain unconnected on PCB |
| 3 | Cathode | Zener breakdown terminal; marked by polarity band; connects to higher-potential node for voltage clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control units and ADAS sensor modules |
| Pb-Free & RoHS Compliant | Meets EU Directive 2011/65/EU and JESD204B process requirements |
| Optimized for Automated Assembly | Standard SOT-23 footprint compatible with pick-and-place machines and reflow profiles |
| High-Density Packaging | 0.0037 cm³ volume enables placement on space-constrained mobile PCBs |
| Thermal Resistance | 500 °C/W junction-to-ambient on FR-5 - informs thermal design margin for sustained operation |
Applications
| USB Power Rail Protection | Automotive Cabin Controller Reference |
|---|---|
Use Scenario: Clamping 5 V USB supply to safe 3.3 V level for microcontroller I/O protection during hot-plug events. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing passive overvoltage limiting without active control logic. Use Value: Prevents latch-up in 3.3 V logic interfaces while drawing only 5 µA standby current at 1 V reverse bias. | Use Scenario: Stabilizing reference voltage for analog sensors in HVAC control modules exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Precision voltage reference with −3.5 mV/°C TC compensating for thermal drift in cabin temperature sensing circuitry. Use Value: Maintains ±1.5% regulation accuracy across −40°C to +125°C operating range per AEC-Q101 stress testing. |
| Portable Medical Device Battery Monitor | Industrial PLC Input Conditioning |
Use Scenario: Providing stable 3.3 V reference for ADC measurement of lithium-ion cell voltage in handheld diagnostic tools. IC Role / Device Role / Timing Role: Low-noise Zener source enabling <1 LSB error in 12-bit battery voltage digitization. Use Value: Delivers 95 Ω dynamic impedance to minimize code-to-code variation under varying load conditions. | Use Scenario: Protecting 24 V digital input channels from transients induced by relay coil switching in factory automation systems. IC Role / Device Role / Timing Role: Transient voltage suppressor absorbing 225 W 8×20 µs pulses without degradation. Use Value: Survives >100,000 surge events per IEC 61000-4-4 compliance testing while maintaining 3.3 V clamping threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C3V3ET1G | Non-automotive grade; lacks AEC-Q101 qualification and PPAP capability | Not approved for automotive production; suitable for consumer electronics only | Select when cost sensitivity outweighs automotive qualification requirements |
| MMSZ4685T1G | Same 3.3 V nominal Zener voltage but 350 mW power rating and 30 Ω impedance at 5 mA | Better regulation stability under high-current transients; larger thermal mass | Prefer where tighter voltage regulation and higher surge capacity are required despite larger footprint |
Compared with BZX84C3V3ET1G and MMSZ4685T1G, SZBZX84C3V3ET1G provides automotive-grade reliability and ESD robustness at the expense of slightly higher impedance, making it optimal for safety-critical embedded systems where qualification and long-term stability are prioritized over marginal regulation tightness.
Availability
SZBZX84C3V3ET1G is available at Aetrix Electronics and suitable for automotive control units, portable medical instrumentation, and industrial PLC input protection requiring stable component supply with full traceability and lifecycle management.
Supply support for SZBZX84C3V3ET1G 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.
The BZX84CxxxET1G/SZBZX84CxxxET1G series is designed for compact, high-reliability voltage regulation in space-constrained and mission-critical systems - especially where AEC-Q101 compliance and high-volume manufacturability are essential.
FAQ
What is the Zener voltage tolerance of SZBZX84C3V3ET1G at 5 mA test current?
The SZBZX84C3V3ET1G has a Zener voltage range of 3.1 V to 3.5 V at IZT = 5 mA and TA = 25°C, corresponding to a ±0.2 V absolute tolerance around the nominal 3.3 V rating. This specification is verified per onsemi's Electrical Characteristics table on page 2 of the August 2024 datasheet revision, and applies strictly under the stated test conditions.
Is SZBZX84C3V3ET1G qualified for automotive applications?
Yes, SZBZX84C3V3ET1G is AEC-Q101 qualified and PPAP capable, with the "SZ" prefix explicitly indicating compliance for automotive and other applications requiring unique site and control change requirements. Its qualification covers temperature cycling, humidity testing, and mechanical shock per AEC-Q101 Rev D standards.
What is the thermal resistance junction-to-ambient for SZBZX84C3V3ET1G on FR-5 board?
The thermal resistance junction-to-ambient (RJA) for SZBZX84C3V3ET1G is 500 °C/W when mounted on FR-5 board at TA = 25°C, with power derating of 2.0 mW/°C above that temperature. This value is specified in the Maximum Ratings table on page 1 of the official onsemi datasheet.
Does SZBZX84C3V3ET1G have a connected pin 2?
No, pin 2 of SZBZX84C3V3ET1G is internally unconnected (NC), as confirmed in the marking diagram and pinout definition on page 2 of the datasheet: "Pinout: 1-Anode, 2-No Connection, 3-Cathode". PCB layout must leave pin 2 floating with no trace or pad connection.
What is the maximum reverse leakage current for SZBZX84C3V3ET1G at 1 V reverse voltage?
The maximum reverse leakage current for SZBZX84C3V3ET1G is 5 µA at VR = 1 V and TA = 25°C, as listed in the Electrical Characteristics table on page 2 of the datasheet. This parameter directly impacts quiescent power consumption in always-on monitoring circuits.
SZBZX84C3V3ET1G 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):
- 3.3 V
- Tolerance:
- ±6%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 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)
SZBZX84C3V3ET1G FAQ
1.How can I place an order for SZBZX84C3V3ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C3V3ET1G 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 SZBZX84C3V3ET1G reliable?
The price and inventory of SZBZX84C3V3ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C3V3ET1G is usually 5 days.
3.What payment methods are accepted for SZBZX84C3V3ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C3V3ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C3V3ET1G?
SZBZX84C3V3ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C3V3ET1G 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 SZBZX84C3V3ET1G?
For technical support, including SZBZX84C3V3ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C3V3ET1G requirements.
6.How does Aetrix verify that SZBZX84C3V3ET1G is sourced from the original manufacturer or authorized distributors?
All SZBZX84C3V3ET1G 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 SZBZX84C3V3ET1G meets industry standards.
7.What is the process for return or replacement of SZBZX84C3V3ET1G?
All SZBZX84C3V3ET1G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C3V3ET1G, 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 SZBZX84C3V3ET1G part is unused and in its original packaging.
Return procedure for SZBZX84C3V3ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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