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

Nexperia USA Inc. BZX79-B68,113

Name: BZX79-B68,113
Brand: Nexperia USA Inc.
SKU: BZX79-B68,113
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX79-B68,113

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: DO-204AH, DO-35, Axial

Datasheet:: BZX79-B68,113.pdf

Description:: DIODE ZENER 68V 400MW ALF2

Quantity:: RFQ Add To RFQ list

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Inventory:5,422

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Product details

Overview

BZX79-B68,113 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal working voltage of 68 V, total power dissipation up to 500 mW at T_amb = 50 °C, and differential resistance of 150 Ω (typ.) at I_Ztest = 2 mA - used as a precision voltage reference in low-power analog signal conditioning and power supply feedback networks.

For engineers reviewing the BZX79-B68,113 datasheet, BZX79-B68,113 pinout, BZX79-B68,113 application, or BZX79-B68,113 equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal resistance (R_{th j-a} = 380 K/W), non-repetitive peak reverse current (0.25 A), temperature coefficient (+90 mV/K typ.), and hermetically sealed SOD27 (DO-35) glass package suitability for stable biasing in industrial sensor interfaces.

Technical Context

This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage across a load by conducting reverse current when applied voltage exceeds its Zener breakdown threshold. Its 68 V nominal Zener voltage is specified at I_Ztest = 2 mA, with typical differential resistance of 150 Ω and temperature coefficient of +90 mV/K - indicating positive drift with junction temperature rise.

The SOD27 (DO-35) axial-leaded glass package enables direct PCB mounting without heatsinking for low-duty-cycle stabilization, and its hermetic seal ensures long-term parameter stability under humid or thermally cycling conditions typical in industrial control modules.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	66.6 V to 69.4 V at I_Z = 2 mA - defines precise regulation window for feedback loop setpoints.
Power Dissipation P_tot	500 mW at T_amb = 50 °C - sets maximum continuous power handling without forced cooling.
Differential Resistance r_dif	150 Ω (typ.) at I_Z = 2 mA - determines output impedance and load regulation sensitivity.
Temperature Coefficient S_Z	+90 mV/K (typ.) - quantifies voltage drift per degree Celsius, critical for temperature-stable references.
Reverse Current I_R	50 nA at V_R = 0.7 × V_Znom - confirms low leakage for high-impedance bias networks.
Non-repetitive Peak I_ZSM	0.25 A at t_p = 100 μs - supports transient overvoltage clamping in surge-limited circuits.
Junction-to-Ambient R_{th j-a}	380 K/W - defines thermal bottleneck for ambient-temperature derating calculations.

Pinout & Package

Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode band marking; leads are untrimmed, intended for through-hole PCB mounting with max. 8 mm lead length for thermal compliance.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / low-side reference node	Connected to circuit ground or lowest potential point in shunt regulation topology.
Cathode	Zener breakdown terminal / regulated output node	Connected to input supply via current-limiting resistor; provides stable 68 V reference to load or error amplifier.

Key Features

Feature	Design Value
±2% Zener voltage tolerance	Enables tight regulation without post-production trimming in voltage reference designs.
Hermetic glass SOD27 package	Guarantees long-term parameter stability in humid or thermally cycled environments.
Low reverse leakage (50 nA)	Minimizes error current in high-impedance feedback paths of precision op-amp circuits.
Positive temperature coefficient (+90 mV/K)	Allows predictable compensation when paired with negative-TC components in reference stacks.

Applications

Industrial Sensor Signal Conditioning

Switch-Mode Power Supply Feedback

Use Scenario: Stabilizing excitation voltage for strain gauge bridges in PLC analog input modules.

IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed 68 V bias to bridge circuitry.

Use Value: ±2% tolerance ensures consistent bridge output scaling across production units without calibration.

Use Scenario: Setting output voltage threshold in isolated flyback converter feedback loop.

IC Role / Device Role / Timing Role: Zener clamp defining optocoupler LED drive level proportional to output voltage.

Use Value: 150 Ω differential resistance minimizes regulation error due to optocoupler CTR variation.

Programmable Logic Controller I/O Protection

Test Equipment Reference Source

Use Scenario: Overvoltage clamping on 24 V DC digital input channels exposed to field wiring transients.

IC Role / Device Role / Timing Role: Transient voltage suppressor limiting input node to 68 V during surge events.

Use Value: 0.25 A non-repetitive peak current rating handles IEC 61000-4-4 burst energy without degradation.

Use Scenario: Precision voltage source in benchtop multimeter front-end calibration circuitry.

IC Role / Device Role / Timing Role: Stable reference for ADC reference buffer stage requiring low-drift bias.

Use Value: Hermetic SOD27 construction prevents parameter drift during extended lab use and thermal cycling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4748A	68 V nominal, ±5% tolerance, 1 W power rating, DO-41 package	Higher power handling but looser tolerance; requires larger PCB footprint	Select when higher surge energy absorption is needed and ±5% regulation accuracy is acceptable
BZX85C68	68 V nominal, ±5% tolerance, 1.3 W power rating, DO-41 package	Higher P_tot and different thermal profile; not hermetically sealed	Prefer for cost-sensitive industrial power supplies where long-term drift is less critical than initial cost

Compared with 1N4748A and BZX85C68, BZX79-B68,113 offers tighter ±2% tolerance and hermetic stability in a smaller SOD27 package - making it optimal for space-constrained, high-accuracy analog reference designs rather than high-power clamping.

Availability

BZX79-B68,113 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, switch-mode power supply feedback, and programmable logic controller I/O protection requiring stable component supply across multi-year production cycles.

Supply support for BZX79-B68,113 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

Nexperia is a global leader in discrete semiconductors, formed in 2017 from the former NXP Standard Products division, specializing in high-volume, high-reliability components for automotive, industrial, and computing markets.

The BZX79 series belongs to Nexperia's voltage regulator diode product line, designed specifically for precision low-power voltage referencing and stabilization in cost-sensitive, space-constrained industrial electronics.

FAQ

What is the maximum continuous power dissipation for BZX79-B68,113?

The maximum continuous power dissipation is 500 mW at ambient temperature of 50 °C with leads trimmed to 8 mm. At higher ambient temperatures, derating is required using the specified thermal resistance of 380 K/W - for example, at 70 °C ambient, maximum allowable power drops to approximately 395 mW.

How is the cathode identified on the BZX79-B68,113 package?

The cathode is marked by a distinct color band (typically black or dark stripe) located near one end of the axial-leaded SOD27 (DO-35) glass body. This band aligns with the cathode terminal, which must be connected to the higher-potential side of the circuit for proper Zener operation.

Does BZX79-B68,113 require a current-limiting resistor in circuit?

Yes - a series current-limiting resistor is mandatory to prevent thermal runaway. The resistor value must ensure Zener test current (2 mA) is maintained while keeping power dissipation within 500 mW limits; for a 75 V supply, a minimum 3.5 kΩ resistor is required to limit current to ~2.1 mA at regulation.

Can BZX79-B68,113 be used in place of BZX79-C68?

No - BZX79-B68,113 has ±2% tolerance while BZX79-C68 has approx. ±5% tolerance; they share identical nominal voltage and package but differ in regulation accuracy and temperature coefficient. Substitution may cause unacceptable output voltage drift in precision applications unless system-level tolerance analysis confirms compatibility.

BZX79-B68,113 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: DO-204AH, DO-35, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

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

Tolerance:: ±2%

Power - Max:: 400 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 ~ 200°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: ALF2

BZX79-B68,113 FAQ

1.How can I place an order for BZX79-B68,113 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX79-B68,113 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 BZX79-B68,113 reliable?

The price and inventory of BZX79-B68,113 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B68,113 is usually 5 days.

3.What payment methods are accepted for BZX79-B68,113?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B68,113 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX79-B68,113?

BZX79-B68,113 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX79-B68,113 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 BZX79-B68,113?

For technical support, including BZX79-B68,113 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B68,113 requirements.

6.How does Aetrix verify that BZX79-B68,113 is sourced from the original manufacturer or authorized distributors?

All BZX79-B68,113 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 BZX79-B68,113 meets industry standards.

7.What is the process for return or replacement of BZX79-B68,113?

All BZX79-B68,113 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B68,113, 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 BZX79-B68,113 part is unused and in its original packaging.

Return procedure for BZX79-B68,113:

1.Submit a request within 90 days.

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

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