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

Taiwan Semiconductor Corporation BZT52C68

Name: BZT52C68
Brand: Taiwan Semiconductor Corporation
SKU: BZT52C68
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZT52C68

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Zener Diodes

Package:: SOD-123F

Datasheet:: BZT52C68.pdf

Description:: DIODE ZENER 68V 500MW SOD123F

Quantity:: RFQ Add To RFQ list

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Inventory:4,422

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Product details

Overview

BZT52C68 from Taiwan Semiconductor is a surface-mount 68 V ±5% tolerance Zener diode in SOD-123F package, rated for 500 mW power dissipation and tested at 2 mA zener current, used for precision voltage reference and low-power stabilization in DC/DC converters and adapters.

For engineers reviewing the BZT52C68 datasheet, BZT52C68 pinout, BZT52C68 application, or BZT52C68 equivalent, key selection criteria include its nominal zener voltage (68.0 V), tight ±5% tolerance, low leakage current (≤0.045 µA at 47.6 V), dynamic impedance (240 Ω at 2 mA), and SOD-123F thermal performance (R_θJA = 350 °C/W).

Technical Context

The BZT52C68 operates as a single-die, cathode-banded Zener diode optimized for stable reverse-breakdown regulation under pulse test conditions (30 ms). Its 68 V nominal zener voltage is specified with ±5% tolerance at I_ZT = 2 mA, and it exhibits a maximum zener impedance of 240 Ω at that current.

Designed for ambient temperatures from –65 °C to +150 °C, the device features matte tin-plated leads compliant with J-STD-002 solderability, UL 94 V-0 molding compound, and moisture sensitivity level 1 per J-STD-020 - enabling standard reflow assembly without dry-pack requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	64.6–71.4 V at 2 mA - ensures stable reference within ±5% across production lot
Power Dissipation (P_D)	500 mW - supports continuous operation up to T_A = 75 °C with derating
Zener Impedance (Z_ZT)	240 Ω max at 2 mA - defines regulation stiffness under small-signal load variation
Leakage Current (I_R)	≤0.045 µA at 47.6 V - enables ultra-low standby current in battery-backed references
Junction Temperature (T_J)	–65 to +150 °C - validated for industrial and automotive under-hood environments
Package	SOD-123F - compact 3.3–3.9 mm body length, compatible with 0805 footprint spacing
Forward Voltage (V_F)	1.0 V at 10 mA - allows use as clamping diode in bidirectional protection circuits

Pinout & Package

SOD-123F package: 2-terminal surface-mount device with cathode indicated by band; dimensions: 3.3–3.9 mm length (B), 1.5–1.7 mm width (A), 0.5–0.7 mm thickness (C); weight ≈ 8.85 mg.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Zener cathode reference ground	Connected to lower-potential node in shunt regulator; establishes reference return path
Cathode	Zener breakdown terminal / voltage reference output	Connected to regulated rail; provides stable 68 V reference when reverse-biased above V_Z

Key Features

Feature	Design Value
±5% zener voltage tolerance	Enables direct replacement in fixed-reference designs without recalibration
SOD-123F package with MSL Level 1	Eliminates dry-pack handling and floor-life constraints in high-volume SMT lines
UL 94 V-0 molding compound	Meets flammability safety requirements for enclosed power supplies and industrial controls
Halogen-free per IEC 61249-2-21	Supports RoHS-compliant and WEEE-aligned manufacturing and end-of-life processing
Low leakage (≤0.045 µA)	Minimizes quiescent current draw in always-on voltage monitor circuits

Applications

DC/DC Converter Reference	Adapter Overvoltage Clamp
Use Scenario: Provides precise 68 V feedback reference in isolated flyback or forward converter secondary-side regulation. IC Role / Device Role / Timing Role: Shunt voltage reference connected across optocoupler input or TL431 cathode resistor divider. Use Value: Tight ±5% tolerance maintains output accuracy within ±1.5% over line/load/temperature without trimming.	Use Scenario: Clamps transient overvoltage on adapter output rail during load dump or ESD events. IC Role / Device Role / Timing Role: Passive crowbar element placed between output and ground, triggered above 71.4 V. Use Value: 240 Ω dynamic impedance limits clamp current rise rate, reducing stress on downstream capacitors.
Industrial Sensor Excitation	Programmable Logic Supply Monitor
Use Scenario: Supplies stable excitation voltage to high-impedance resistive sensors (e.g., RTDs, strain gauges) in 4–20 mA transmitters. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source driving sensor bridge with minimal self-heating. Use Value: 500 mW rating allows operation at 68 V × 7 mA = 476 mW, leaving margin for ambient temperature derating.	Use Scenario: Monitors FPGA or microcontroller core supply (e.g., 65–70 V auxiliary rail) for brownout detection. IC Role / Device Role / Timing Role: Input to comparator circuit detecting deviation beyond ±5% window around nominal rail. Use Value: 0.045 µA leakage ensures negligible loading on high-impedance divider networks used in precision monitoring.

DC/DC Converter Reference

Adapter Overvoltage Clamp

Use Scenario: Provides precise 68 V feedback reference in isolated flyback or forward converter secondary-side regulation.

IC Role / Device Role / Timing Role: Shunt voltage reference connected across optocoupler input or TL431 cathode resistor divider.

Use Value: Tight ±5% tolerance maintains output accuracy within ±1.5% over line/load/temperature without trimming.

Use Scenario: Clamps transient overvoltage on adapter output rail during load dump or ESD events.

IC Role / Device Role / Timing Role: Passive crowbar element placed between output and ground, triggered above 71.4 V.

Use Value: 240 Ω dynamic impedance limits clamp current rise rate, reducing stress on downstream capacitors.

Industrial Sensor Excitation

Programmable Logic Supply Monitor

Use Scenario: Supplies stable excitation voltage to high-impedance resistive sensors (e.g., RTDs, strain gauges) in 4–20 mA transmitters.

IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source driving sensor bridge with minimal self-heating.

Use Value: 500 mW rating allows operation at 68 V × 7 mA = 476 mW, leaving margin for ambient temperature derating.

Use Scenario: Monitors FPGA or microcontroller core supply (e.g., 65–70 V auxiliary rail) for brownout detection.

IC Role / Device Role / Timing Role: Input to comparator circuit detecting deviation beyond ±5% window around nominal rail.

Use Value: 0.045 µA leakage ensures negligible loading on high-impedance divider networks used in precision monitoring.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBZ5268BLT1G	Same 68 V ±5%, but rated 350 mW and packaged in SOT-23; higher R_θJA (~400 °C/W)	Lower power handling limits use in sustained 68 V regulation; better suited for signal-level clamping	Select when board space permits SOT-23 and thermal budget allows higher junction rise
1N4749A	Through-hole DO-41 package; same 68 V ±5%, 1 W rating; no MSL or halogen-free compliance	Requires wave soldering or hand assembly; unsuitable for automated SMT production	Select only for prototyping, legacy repair, or non-RoHS applications where lead-free reflow is not required

Compared with MMBZ5268BLT1G and 1N4749A, the BZT52C68 uniquely combines SMD manufacturability, 500 mW power capability, MSL Level 1, and halogen-free compliance - making it optimal for volume production of industrial DC/DC modules requiring long-term supply stability and regulatory alignment.

Availability

BZT52C68 is available at Aetrix Electronics and suitable for DC/DC converter reference design, adapter overvoltage protection, and industrial sensor excitation requiring stable component supply and full RoHS/WEEE compliance.

Supply support for BZT52C68 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global industrial, computing, and consumer markets since 1979.

The BZT52C series was developed to deliver cost-effective, high-reliability Zener diodes for SMT-based power management and voltage reference applications - emphasizing tight tolerance control, consistent thermal performance, and full environmental compliance.

FAQ

What is the zener voltage tolerance of BZT52C68?

The BZT52C68 has a nominal zener voltage of 68.0 V with a guaranteed tolerance of ±5%, meaning the actual measured V_Z falls between 64.6 V and 71.4 V when tested at I_ZT = 2 mA under pulse conditions. This tolerance is confirmed in the Electrical Specifications table on page 2 of the Taiwan Semiconductor datasheet (Version G1804).

What package type does BZT52C68 use?

The BZT52C68 uses the SOD-123F surface-mount package, as explicitly stated in the Ordering Information section and Package Outline Dimension drawing (page 6). It features a 3.3–3.9 mm body length, cathode band marking, and matte tin-plated leads compliant with J-STD-002 solderability standards.

What is the maximum power dissipation for BZT52C68?

The BZT52C68 has a maximum power dissipation (P_D) of 500 mW at T_A = 25 °C, as listed in both the KEY PARAMETERS and ABSOLUTE MAXIMUM RATINGS tables. Derating begins above 25 °C at 3.33 mW/°C, based on its R_θJA of 350 °C/W.

Is BZT52C68 RoHS and halogen-free compliant?

Yes, the BZT52C68 complies with RoHS Directive 2011/65/EU and WEEE 2002/96/EC, and is halogen-free per IEC 61249-2-21, as confirmed in the FEATURES section (page 1) of the official Taiwan Semiconductor datasheet.

What is the leakage current specification for BZT52C68?

The BZT52C68 specifies a maximum leakage current (I_R) of 0.045 µA at V_R = 47.6 V (70% of nominal V_Z), as documented in the Electrical Specifications table. This ultra-low leakage supports energy-efficient voltage monitoring in battery-powered systems.

BZT52C68 Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: SOD-123F

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 68 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 240 Ohms

Current - Reverse Leakage @ Vr:: 45 nA @ 47.6 V

Voltage - Forward (Vf) (Max) @ If:: 1 V @ 10 mA

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-123F

BZT52C68 FAQ

1.How can I place an order for BZT52C68 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZT52C68 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 BZT52C68 reliable?

The price and inventory of BZT52C68 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52C68 is usually 5 days.

3.What payment methods are accepted for BZT52C68?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52C68 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZT52C68?

BZT52C68 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZT52C68 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 BZT52C68?

For technical support, including BZT52C68 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52C68 requirements.

6.How does Aetrix verify that BZT52C68 is sourced from the original manufacturer or authorized distributors?

All BZT52C68 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 BZT52C68 meets industry standards.

7.What is the process for return or replacement of BZT52C68?

All BZT52C68 units undergo pre-shipment inspection (PSI). If there is an issue with BZT52C68, 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 BZT52C68 part is unused and in its original packaging.

Return procedure for BZT52C68:

1.Submit a request within 90 days.

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

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