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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

onsemi SZBZX84C68ET1G

Name: SZBZX84C68ET1G
Brand: onsemi
SKU: SZBZX84C68ET1G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SZBZX84C68ET1G

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: SZBZX84C68ET1G.pdf

Description:: DIODE ZENER 68V 225MW SOT23-3

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Product details

Overview

SZBZX84C68ET1G from onsemi is a 68 V, 250 mW Zener diode in SOT-23 package, designed for precision voltage regulation and overvoltage protection in space-constrained circuits. It delivers nominal Zener voltage of 68 V at 10 mA test current, with dynamic impedance of 475 Ω at 10 mA and reverse leakage current ≤50 nA at 54.4 V, commonly used in power supply feedback loops and voltage reference circuits.

For engineers reviewing the SZBZX84C68ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (64–72 V), temperature coefficient (+47.6 mV/°C), junction-to-ambient thermal resistance (500 °C/W on FR-5), ESD rating (>16 kV HBM), and automotive-grade AEC-Q101 qualification.

Technical Context

This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp voltage across its terminals. Its Zener mechanism dominates above ~5.6 V, providing stable regulation with low dynamic impedance and predictable temperature drift.

It features a three-pin SOT-23 package with Pin 1 = Anode, Pin 2 = No Connection, Pin 3 = Cathode - enabling unidirectional clamping in series or shunt configurations. The device is Pb-free, RoHS-compliant, and rated for junction temperatures from −65 °C to +150 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	68 V nominal at I_ZT = 10 mA; range 64–72 V ensures design margin for 5% tolerance applications.
Power Dissipation	250 mW on FR-5 board; derates linearly above 25 °C (2.0 mW/°C), limiting continuous operation in high-ambient environments.
Zener Impedance (Z_ZT)	475 Ω at I_ZT = 10 mA; defines output impedance in regulation mode, affecting load transient response.
Reverse Leakage Current	≤50 nA at V_R = 54.4 V; critical for low-power standby circuits where quiescent current must be minimized.
Temperature Coefficient	+47.6 mV/°C at I_ZT = 5 mA; positive drift enables compensation pairing with negative-drift components in precision references.
ESD Rating	Class 3 (>16 kV) per Human Body Model; supports robust handling and integration into portable electronics without additional ESD protection.
Junction Temp Range	−65 °C to +150 °C; validated for under-hood automotive and industrial control applications requiring extended thermal operation.

Pinout & Package

SOT-23 (TO-236) surface-mount package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting plastic case with corrosion-resistant finish and UL 94 V-0 flammability rating. Cathode indicated by polarity band.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode	Connected to lower-potential node in shunt regulation; reverse-biased during Zener operation.
2	No Connection	Internally unconnected; must remain floating - no PCB trace or solder mask required.
3	Cathode	Connected to higher-potential node; carries full Zener current during regulation and defines voltage reference point.

Key Features

Feature	Design Value
AEC-Q101 Qualified	Validated for automotive applications including engine control units and body electronics requiring PPAP documentation.
Low Capacitance	35 pF at V_R = 0 V, f = 1 MHz - minimizes signal distortion in high-frequency clamping and RF bias networks.
Pb-Free & RoHS	Fully compliant with EU RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1.
High Peak Power	225 W pulse rating (8 × 20 µs) enables transient surge suppression in DC power rails without external TVS devices.
Stable Zener Voltage	±5% tolerance (64–72 V) and tight 10 mV/°C tempco variation across production lots ensure consistent reference accuracy.

Applications

Switch-Mode Power Supply Feedback	Automotive ECU Voltage Clamp
Use Scenario: Used in optocoupler-coupled feedback loop of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Shunt voltage reference that sets error amplifier threshold and determines output setpoint accuracy. Use Value: 68 V rating allows direct sensing of 12 V rail via resistive divider while maintaining >10× safety margin against transients.	Use Scenario: Placed across microcontroller I/O pins or sensor supply lines in engine control modules exposed to load dump events. IC Role / Device Role / Timing Role: Passive overvoltage clamp protecting sensitive analog inputs from ISO 7637-2 Pulse 5a surges up to 60 V. Use Value: AEC-Q101 qualification and 150 °C junction rating ensure reliability in under-hood environments where ambient exceeds 105 °C.
Portable Device Battery Protection	Industrial Sensor Signal Conditioning
Use Scenario: Integrated into Li-ion battery pack monitoring circuitry to prevent overvoltage during charging cycles. IC Role / Device Role / Timing Role: Precision voltage threshold detector that triggers charge termination when cell voltage reaches 4.2 V (via scaled-down input). Use Value: Low 50 nA leakage at 54.4 V ensures negligible self-discharge in always-on battery management ICs operating for years on coin cells.	Use Scenario: Employed in 4–20 mA transmitter front-end to protect ADC inputs from field-wiring faults and ESD events. IC Role / Device Role / Timing Role: Bidirectional ESD suppressor and DC clamp that limits input voltage to safe levels without loading the sensor bridge. Use Value: 16 kV HBM ESD rating eliminates need for discrete TVS diodes, reducing BOM count and PCB area in compact transmitter modules.

Switch-Mode Power Supply Feedback

Automotive ECU Voltage Clamp

Use Scenario: Used in optocoupler-coupled feedback loop of isolated DC-DC converters to regulate output voltage.

IC Role / Device Role / Timing Role: Shunt voltage reference that sets error amplifier threshold and determines output setpoint accuracy.

Use Value: 68 V rating allows direct sensing of 12 V rail via resistive divider while maintaining >10× safety margin against transients.

Use Scenario: Placed across microcontroller I/O pins or sensor supply lines in engine control modules exposed to load dump events.

IC Role / Device Role / Timing Role: Passive overvoltage clamp protecting sensitive analog inputs from ISO 7637-2 Pulse 5a surges up to 60 V.

Use Value: AEC-Q101 qualification and 150 °C junction rating ensure reliability in under-hood environments where ambient exceeds 105 °C.

Portable Device Battery Protection

Industrial Sensor Signal Conditioning

Use Scenario: Integrated into Li-ion battery pack monitoring circuitry to prevent overvoltage during charging cycles.

IC Role / Device Role / Timing Role: Precision voltage threshold detector that triggers charge termination when cell voltage reaches 4.2 V (via scaled-down input).

Use Value: Low 50 nA leakage at 54.4 V ensures negligible self-discharge in always-on battery management ICs operating for years on coin cells.

Use Scenario: Employed in 4–20 mA transmitter front-end to protect ADC inputs from field-wiring faults and ESD events.

IC Role / Device Role / Timing Role: Bidirectional ESD suppressor and DC clamp that limits input voltage to safe levels without loading the sensor bridge.

Use Value: 16 kV HBM ESD rating eliminates need for discrete TVS diodes, reducing BOM count and PCB area in compact transmitter modules.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener voltage regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84C68ET1G	Same electrical specs and SOT-23 package but lacks AEC-Q101 qualification and automotive traceability.	Approved only for commercial/industrial use; not suitable for automotive OEM designs requiring PPAP.	Select when cost sensitivity outweighs automotive compliance requirements and lifecycle assurance is not mandated.
MMSZ5268ET1G	68 V Zener, 500 mW rating, SOD-123 package; higher power but larger footprint and different thermal profile.	Preferred in high-reliability industrial power supplies where board space permits and derating margin is needed.	Choose when thermal dissipation >250 mW is required or when legacy SOD-123 layout compatibility is essential.

Compared with BZX84C68ET1G, SZBZX84C68ET1G adds automotive qualification and tighter lot-to-lot process control, while MMSZ5268ET1G trades miniaturization for higher power handling - making SZBZX84C68ET1G optimal for space-constrained automotive subsystems needing guaranteed reliability.

Availability

SZBZX84C68ET1G is available at Aetrix Electronics and suitable for automotive ECUs, portable power management systems, and industrial sensor interfaces requiring stable component supply across multi-year production cycles.

Supply support for SZBZX84C68ET1G 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, medical, and IoT applications.

The BZX84CxxxET1G/SZBZX84CxxxET1G series was developed to provide miniature, high-reliability Zener regulation for high-density PCBs in portable and automotive electronics.

FAQ

What is the Zener voltage tolerance of SZBZX84C68ET1G at 10 mA test current?

The SZBZX84C68ET1G has a Zener voltage range of 64 V to 72 V at I_ZT = 10 mA, corresponding to ±5.9% tolerance around the nominal 68 V rating. This specification is verified per onsemi's Electrical Characteristics table on page 3 of the August 2024 datasheet revision, and applies under TA = 25 °C with pulse testing to minimize self-heating effects. The SZBZX84C68ET1G maintains this tolerance across its qualified operating temperature range.

Is SZBZX84C68ET1G suitable for automotive applications?

Yes, SZBZX84C68ET1G is AEC-Q101 qualified and PPAP capable, explicitly designated for automotive and other applications requiring unique site and process controls. Its construction, test flow, and traceability meet automotive quality standards, and it is rated for junction temperatures from −65 °C to +150 °C. The "SZ" prefix denotes this automotive-grade variant, distinguishing it from the commercial BZX84C68ET1G. SZBZX84C68ET1G is documented for use in engine control units, body electronics, and ADAS power domains.

What is the thermal resistance of SZBZX84C68ET1G on an FR-5 board?

The thermal resistance from junction-to-ambient (R_JA) for SZBZX84C68ET1G is 500 °C/W when mounted on an FR-5 board, as specified in the Maximum Ratings table on page 1 of the datasheet. This value assumes standard 1.0 × 0.75 × 0.62 inch board dimensions and defines the temperature rise per watt of dissipated power. Derating begins above 25 °C at 2.0 mW/°C, meaning usable power drops to 150 mW at 75 °C ambient. This R_JA directly impacts thermal design margins in enclosed automotive or industrial enclosures.

Does SZBZX84C68ET1G have a connection on Pin 2?

No, Pin 2 of the SZBZX84C68ET1G is internally not connected (NC), as confirmed in the marking diagram and mechanical outline on page 6 of the datasheet, which specifies Style 8 pin configuration: Pin 1 = Anode, Pin 2 = No Connection, Pin 3 = Cathode. This NC terminal must remain unconnected on the PCB - no trace, pad, or solder should be applied. It is not a substrate tie or thermal pad, and grounding or routing to it will not improve performance or thermal behavior.

What is the maximum reverse leakage current for SZBZX84C68ET1G?

The maximum reverse leakage current for SZBZX84C68ET1G is 50 nA at V_R = 54.4 V (80% of nominal Zener voltage), as stated in the Electrical Characteristics table on page 3. This parameter is measured at T_A = 25 °C and defines the upper bound of off-state conduction before breakdown onset. At lower voltages (e.g., 10 V), leakage drops to <1 nA. This ultra-low IR supports energy-sensitive applications such as battery-backed real-time clocks and always-on sensor nodes where standby current must remain sub-100 nA.

SZBZX84C68ET1G 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):: 68 V

Tolerance:: ±6%

Power - Max:: 225 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)

SZBZX84C68ET1G FAQ

1.How can I place an order for SZBZX84C68ET1G through Aetrix?

Please submit a Request for Quotation (RFQ) for SZBZX84C68ET1G 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 SZBZX84C68ET1G reliable?

The price and inventory of SZBZX84C68ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C68ET1G is usually 5 days.

3.What payment methods are accepted for SZBZX84C68ET1G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C68ET1G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SZBZX84C68ET1G?

SZBZX84C68ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SZBZX84C68ET1G 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 SZBZX84C68ET1G?

For technical support, including SZBZX84C68ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C68ET1G requirements.

6.How does Aetrix verify that SZBZX84C68ET1G is sourced from the original manufacturer or authorized distributors?

All SZBZX84C68ET1G 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 SZBZX84C68ET1G meets industry standards.

7.What is the process for return or replacement of SZBZX84C68ET1G?

All SZBZX84C68ET1G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C68ET1G, 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 SZBZX84C68ET1G part is unused and in its original packaging.

Return procedure for SZBZX84C68ET1G:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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