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onsemi SZBZX84C20ET1G
- Part No.:
- SZBZX84C20ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C20ET1G.pdf
- Description:
- DIODE ZENER 20V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:11,477
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Product details
Overview
SZBZX84C20ET1G from onsemi is a 20 V, 250 mW surface-mount Zener diode in SOT-23 package, designed for precision voltage regulation and reference applications. It delivers nominal Zener voltage of 20.0 V at 5 mA test current, with dynamic impedance of 55 Ω, temperature coefficient of +14 mV/°C, and reverse leakage current ≤0.05 μA at 16 V. It is used in power supply feedback loops, overvoltage protection, and voltage reference circuits in portable electronics.
For engineers reviewing the SZBZX84C20ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±1.2 V), low capacitance (85 pF at 0 V), AEC-Q101 qualification, Pb-free RoHS compliance, and thermal resistance of 500 °C/W on FR-5 board.
Technical Context
This device operates as a two-terminal voltage reference diode with cathode-anode polarity and no internal connection on pin 2. Its Zener breakdown mechanism provides stable reverse conduction above 18.8 V, with minimal voltage drift over temperature due to its positive temperature coefficient (+14 mV/°C).
It supports pulse operation up to 225 W (8 × 20 μs) and maintains regulation under DC currents up to 20 mA, with forward voltage ≤0.90 V at 10 mA. The SOT-23 package enables high-density PCB placement while meeting Class 3 ESD robustness (>16 kV HBM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18.8–21.2 V at 5 mA - ensures stable regulation across production lot and temperature |
| Power Dissipation | 250 mW on FR-5 board - defines maximum continuous DC power handling without derating |
| Zener Impedance (ZZT) | 55 Ω at 5 mA - determines output voltage stability under load current variation |
| Reverse Leakage Current | ≤0.05 μA at 16 V - guarantees low standby power loss in high-impedance bias networks |
| Capacitance | 85 pF at 0 V, 1 MHz - limits high-frequency noise coupling in reference paths |
| Temperature Coefficient | +14 mV/°C at 5 mA - quantifies voltage drift per degree Celsius rise in ambient |
| ESD Rating | Class 3 (>16 kV HBM) - ensures robustness during automated PCB assembly and handling |
Pinout & Package
SOT-23 (TO-236) plastic surface-mount package, 2.90 mm × 1.30 mm × 1.00 mm, void-free thermosetting case with corrosion-resistant finish and UL 94 V-0 flammability rating. Cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential side of regulated node; carries forward current during biasing |
| 2 | No Connection | Internally unconnected; must remain floating-no PCB trace or pad required |
| 3 | Cathode | Connected to higher-potential side; defines Zener breakdown voltage relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock |
| Pb-free and RoHS compliant | Meets global environmental regulations with SnAgCu solder compatibility and lead-free marking "G" |
| Low dynamic impedance | 55 Ω at 5 mA enables tight voltage regulation in feedback networks with varying load |
| High ESD immunity | Class 3 HBM (>16 kV) eliminates need for external ESD protection in handheld PCB layouts |
| Optimized for automated assembly | Standard SOT-23 footprint and tape-and-reel packaging (3,000 pcs/reel) support high-speed pick-and-place |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated DC-DC converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Zener reference element setting error amplifier threshold in secondary-side control loop. Use Value: 20.0 V nominal Zener voltage enables precise 24 V rail regulation with ±1.2 V tolerance and <1 % line/load regulation impact. | Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events on industrial sensor lines. IC Role / Device Role / Timing Role: Shunt clamping device diverting surge current when line voltage exceeds 20 V. Use Value: 225 W peak pulse capability handles 8 × 20 μs transients without degradation; 0.05 μA leakage avoids signal distortion at rest. |
| Voltage Reference | Portable Device Biasing |
Use Scenario: Providing stable bias voltage for analog front-end amplifiers in battery-powered medical sensors. IC Role / Device Role / Timing Role: Precision two-terminal reference source replacing larger three-terminal IC references. Use Value: +14 mV/°C TC allows predictable compensation in temperature-sensitive gain stages; 85 pF capacitance minimizes phase shift in feedback paths. | Use Scenario: Generating regulated 20 V bias for OLED display drivers in smartphones and wearables. IC Role / Device Role / Timing Role: Compact voltage clamp ensuring consistent LED current drive despite battery voltage sag. Use Value: SOT-23 footprint saves >60 % board area vs. DO-35; 250 mW rating supports continuous operation at 10 mA load current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C20ET1G | Non-automotive grade; lacks AEC-Q101 qualification and SZ prefix; identical electrical specs and SOT-23 pinout | Not suitable for automotive ECUs or safety-critical modules requiring PPAP documentation | Select when cost sensitivity outweighs automotive qualification requirements |
| MMSZ4684T1G | Same 20 V nominal Zener, but rated at 500 mW; higher power dissipation and 30 Ω ZZT; SOD-123 package (larger footprint) | Preferred where higher surge energy absorption or lower impedance is needed, but board space permits larger package | Choose for industrial power supplies needing margin above 250 mW continuous dissipation |
Compared with BZX84C20ET1G and MMSZ4684T1G, SZBZX84C20ET1G uniquely combines automotive qualification, compact SOT-23 size, and optimized 250 mW/55 Ω balance for space-constrained, high-reliability portable and automotive subsystems.
Availability
SZBZX84C20ET1G is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and precision voltage reference applications requiring stable component supply, long-term lifecycle support, and automotive-grade traceability.
Supply support for SZBZX84C20ET1G 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.
The BZX84CxxxET1G/SZBZX84CxxxET1G series was developed to provide compact, reliable, and AEC-Q101-qualified Zener regulation for high-density portable and automotive electronics.
FAQ
What is the Zener voltage tolerance of SZBZX84C20ET1G at 5 mA?
The SZBZX84C20ET1G has a Zener voltage range of 18.8 V to 21.2 V at 5 mA test current, corresponding to a ±1.2 V absolute tolerance or ±6 % of nominal 20.0 V. This tolerance is specified at TA = 25 °C and reflects production spread across the device family; actual units are marked with code "BC6" per onsemi's marking diagram.
Is SZBZX84C20ET1G suitable for automotive applications?
Yes, SZBZX84C20ET1G is AEC-Q101 qualified and PPAP capable, with the "SZ" prefix indicating automotive-specific site and process controls. It meets stringent requirements for temperature cycling, humidity resistance, and mechanical shock, making it appropriate for engine control units, body electronics, and ADAS subsystems where Zener reference stability is critical.
What is the thermal resistance of SZBZX84C20ET1G on FR-5 board?
The thermal resistance junction-to-ambient (RJA) for SZBZX84C20ET1G is 500 °C/W when mounted on FR-5 board at TA = 25 °C. This value assumes standard JEDEC 2s2p copper layout; derating is required above 25 °C at 2.0 mW/°C, limiting usable power dissipation to 200 mW at 50 °C ambient.
Does SZBZX84C20ET1G have a connected pin 2?
No, pin 2 of SZBZX84C20ET1G is internally unconnected (NC), as confirmed in the datasheet's pinout diagram (Style 8). It must be left floating on the PCB-no trace, pad, or via should connect to this terminal, as doing so may compromise thermal performance or cause unintended current paths.
What is the maximum reverse leakage current for SZBZX84C20ET1G?
The maximum reverse leakage current for SZBZX84C20ET1G is 0.05 μA at VR = 16 V and TA = 25 °C. This ultra-low leakage ensures minimal quiescent current draw in high-impedance reference divider networks and prevents signal corruption in precision analog circuits powered from low-current sources.
SZBZX84C20ET1G 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):
- 20 V
- Tolerance:
- ±6%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 14 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)
SZBZX84C20ET1G FAQ
1.How can I place an order for SZBZX84C20ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C20ET1G 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 SZBZX84C20ET1G reliable?
The price and inventory of SZBZX84C20ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C20ET1G is usually 5 days.
3.What payment methods are accepted for SZBZX84C20ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C20ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C20ET1G?
SZBZX84C20ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C20ET1G 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 SZBZX84C20ET1G?
For technical support, including SZBZX84C20ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C20ET1G requirements.
6.How does Aetrix verify that SZBZX84C20ET1G is sourced from the original manufacturer or authorized distributors?
All SZBZX84C20ET1G 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 SZBZX84C20ET1G meets industry standards.
7.What is the process for return or replacement of SZBZX84C20ET1G?
All SZBZX84C20ET1G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C20ET1G, 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 SZBZX84C20ET1G part is unused and in its original packaging.
Return procedure for SZBZX84C20ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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