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onsemi SZBZX84C68LT1G
- Part No.:
- SZBZX84C68LT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C68LT1G.pdf
- Description:
- DIODE ZENER 68V 250MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
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Product details
Overview
SZBZX84C68LT1G from onsemi is a 68 V ±5% Zener diode in SOT-23 package, rated for 250 mW power dissipation on FR-5 board at 25°C, with 240 Ω dynamic impedance at 5 mA test current and 0.05 μA reverse leakage at 52 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog circuits.
For engineers reviewing the SZBZX84C68LT1G datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance (±5%), thermal coefficient (+47.6 mV/°C), junction-to-ambient thermal resistance (500 °C/W), and AEC-Q101 qualification for automotive use.
Technical Context
This device operates in reverse-bias breakdown mode to maintain stable voltage across its terminals under varying load or supply conditions. Its 68 V nominal Zener voltage is specified at 5 mA test current (IZT), with dynamic impedance measured at both 1 mA and 20 mA to characterize regulation performance across operating ranges.
The SOT-23 package features three terminals: anode (Pin 1), no connection (Pin 2), and cathode (Pin 3). The cathode is marked by a polarity band, and the device exhibits Class 3 ESD rating (>16 kV HBM) and Pb-free RoHS compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 64–72 V at 5 mA IZT; defines clamping threshold in protection circuits or reference level in bias networks |
| Power Dissipation | 250 mW on FR-5 board at 25°C; limits continuous current to ~3.7 mA at 68 V without derating |
| Zener Impedance | 240 Ω at 5 mA; determines output voltage variation under load changes in regulation applications |
| Reverse Leakage | 0.05 μA at 52 V VR; ensures minimal quiescent current in high-impedance sensing or standby circuits |
| Temperature Coefficient | +47.6 mV/°C at 5 mA; indicates positive drift requiring compensation in precision references above 60 V |
| Capacitance | 35 pF at 0 V, 1 MHz; affects high-frequency noise filtering and transient response in decoupling roles |
| ESD Rating | Class 3 (>16 kV HBM); supports robust handling in automated assembly and end-use 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, UL 94 V-0 flammability rating, and 260°C max soldering temperature for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; reverse-biased during Zener operation |
| 2 | No Connection | Internally unconnected; must remain floating-no PCB trace or pad required |
| 3 | Cathode | Connected to higher-potential 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 |
| Pb-Free & RoHS Compliant | Meets global environmental regulations and lead-free reflow soldering requirements |
| High ESD Robustness | Withstands >16 kV human-body-model discharge without parameter shift or failure |
| Optimized for High-Density Layout | SOT-23 footprint enables placement near IC power pins for local voltage stabilization |
| Tight Thermal Stability | Specified junction temperature range of −65°C to +150°C supports extended industrial operation |
Applications
| Automotive Sensor Biasing | Industrial Power Supply Clamp |
|---|---|
Use Scenario: Providing stable 68 V reference for analog front-end circuitry in exhaust gas oxygen sensors. IC Role / Device Role / Timing Role: Zener voltage reference establishing fixed bias point for op-amp input stages. Use Value: Maintains sensor signal integrity across −40°C to +125°C ambient while meeting AEC-Q101 reliability requirements. |
Use Scenario: Clamping transient overvoltage spikes on 48 V DC bus lines in programmable logic controllers. IC Role / Device Role / Timing Role: Overvoltage protection element limiting rail voltage to safe levels during load dump events. Use Value: Absorbs up to 250 mW surge energy without degradation, leveraging 240 Ω Zener impedance to limit peak current. |
| Medical Instrument Reference | Telecom Line Interface Protection |
Use Scenario: Generating precise 68 V calibration voltage for high-voltage photomultiplier tube bias supplies. IC Role / Device Role / Timing Role: Primary voltage reference in feedback loop of isolated DC-DC converter. Use Value: Delivers <0.05 μA leakage at 52 V to minimize error in ultra-low-current measurement paths. |
Use Scenario: Protecting Ethernet PHY transceivers from induced surges on PoE-powered data lines. IC Role / Device Role / Timing Role: Secondary-level transient voltage suppressor placed after primary gas discharge tube. Use Value: Provides fast-response clamping with 35 pF capacitance to avoid signal integrity loss at 100 MHz Ethernet frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C68LT1G | Same electrical specs but lacks AEC-Q101 qualification and SZ-prefix automotive traceability | Not suitable for automotive production; acceptable for industrial prototypes or non-safety-critical systems | Select when cost sensitivity outweighs automotive compliance requirements |
| SZBZX84C62LT1G | 62 V nominal Zener voltage, +43.4 mV/°C tempco, 215 Ω impedance at 5 mA | Lower clamping voltage suits 48 V system designs where 68 V exceeds required margin | Choose for tighter voltage headroom in battery-backed backup circuits |
Compared with BZX84C68LT1G and SZBZX84C62LT1G, the SZBZX84C68LT1G provides automotive-grade reliability at 68 V while maintaining identical SOT-23 footprint and thermal characteristics-enabling drop-in replacement only where AEC-Q101 validation is mandatory.
Availability
SZBZX84C68LT1G is available at Aetrix Electronics and suitable for automotive sensor modules, industrial power supply clamping, and medical instrument voltage reference applications requiring stable component supply and long-term lifecycle support.
Supply support for SZBZX84C68LT1G 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The SZBZX84CxxxLT1G series belongs to onsemi's automotive-qualified Zener regulator portfolio, designed specifically for voltage reference, overvoltage protection, and biasing functions in harsh-environment electronic control units.
FAQ
What is the Zener voltage tolerance of SZBZX84C68LT1G?
The SZBZX84C68LT1G has a nominal Zener voltage of 68 V with a tolerance of ±5%, meaning the actual breakdown voltage falls between 64 V and 72 V when tested at 5 mA (IZT) and 25°C ambient. This tolerance is defined per the "C" series standard specification and applies across the full operating temperature range.
Is SZBZX84C68LT1G suitable for automotive applications?
Yes, SZBZX84C68LT1G is AEC-Q101 qualified and PPAP capable, with the "SZ" prefix indicating automotive-specific site controls and change management. It meets stringent reliability, traceability, and qualification requirements for use in engine control units, ADAS sensors, and body electronics.
What is the maximum power dissipation of SZBZX84C68LT1G on FR-5 board?
SZBZX84C68LT1G is rated for 250 mW total power dissipation on FR-5 board at 25°C ambient temperature. Above 25°C, it derates linearly at 2.0 mW/°C, reaching zero dissipation capability at 150°C junction temperature.
Does SZBZX84C68LT1G have a no-connect pin, and how should it be handled on PCB?
Yes, SZBZX84C68LT1G has Pin 2 designated as "No Connection" per the official marking diagram and mechanical outline. This terminal is internally unconnected and must remain unattached on the PCB-no trace, pad, or via should be routed to it during layout.
What is the Zener impedance of SZBZX84C68LT1G at different test currents?
SZBZX84C68LT1G exhibits 240 Ω dynamic impedance at 5 mA (IZT1), 475 Ω at 1 mA (IZT2), and 130 Ω at 20 mA (IZT3). These values reflect increasing regulation effectiveness at higher currents, critical for selecting appropriate series resistors in shunt regulator designs.
SZBZX84C68LT1G 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):
- 68 V
- Tolerance:
- ±6%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 240 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 47.6 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)
SZBZX84C68LT1G FAQ
1.How can I place an order for SZBZX84C68LT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C68LT1G 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 SZBZX84C68LT1G reliable?
The price and inventory of SZBZX84C68LT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C68LT1G is usually 5 days.
3.What payment methods are accepted for SZBZX84C68LT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C68LT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C68LT1G?
SZBZX84C68LT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C68LT1G 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 SZBZX84C68LT1G?
For technical support, including SZBZX84C68LT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C68LT1G requirements.
6.How does Aetrix verify that SZBZX84C68LT1G is sourced from the original manufacturer or authorized distributors?
All SZBZX84C68LT1G 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 SZBZX84C68LT1G meets industry standards.
7.What is the process for return or replacement of SZBZX84C68LT1G?
All SZBZX84C68LT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C68LT1G, 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 SZBZX84C68LT1G part is unused and in its original packaging.
Return procedure for SZBZX84C68LT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZBZX84C68LT1G Tags
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