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

Nexperia USA Inc. BZX79-C20,113

Name: BZX79-C20,113
Brand: Nexperia USA Inc.
SKU: BZX79-C20,113
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX79-C20,113

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX79-C20,113.pdf

Description:: DIODE ZENER 20V 400MW ALF2

Quantity:: RFQ Add To RFQ list

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Inventory:5,853

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Product details

Overview

BZX79-C20,113 from Nexperia is a ±5% tolerance Zener voltage regulator diode rated for 20 V nominal working voltage at 5 mA test current, with 60 Ω typical differential resistance, 12.3 mV/K temperature coefficient, and 60 pF junction capacitance at 1 MHz. It delivers stable low-power voltage reference in compact SOD27 (DO-35) glass package for biasing, regulation, and overvoltage protection in analog front-ends and power supply feedback loops.

For engineers reviewing the BZX79-C20,113 datasheet, BZX79-C20,113 pinout, BZX79-C20,113 application, or BZX79-C20,113 equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (380 K/W), non-repetitive peak reverse power (40 W), junction-to-ambient thermal performance, and compatibility with leaded through-hole PCB assembly.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable reference voltage across its terminals under varying load and temperature conditions. Its 20 V nominal Zener voltage is specified at I_Ztest = 5 mA, with a temperature coefficient of +12.3 mV/K - indicating positive drift with rising junction temperature - and differential resistance of 60 Ω (typ.) ensuring predictable dynamic impedance in regulation circuits.

The device uses a hermetically sealed glass SOD27 (DO-35) package with axial leads and cathode band marking. It supports continuous forward current up to 250 mA and non-repetitive peak reverse current up to 1.5 A (for 100 μs pulses), with maximum total power dissipation of 500 mW at T_amb = 50 °C and no metallization pad.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	18.8 V to 21.2 V at I_Z = 5 mA - defines usable regulation window for precision reference design
Differential Resistance r_dif	60 Ω (typ.), ≤225 Ω (max) - determines output impedance and load regulation error
Temperature Coefficient S_Z	+12.3 mV/K (typ.) - quantifies voltage drift per degree Celsius rise in junction temperature
Junction Capacitance C_d	60 pF at f = 1 MHz, V_R = 0 V - impacts high-frequency noise coupling and transient response
Non-repetitive Peak Power P_ZSM	40 W at t_p = 100 μs - enables surge suppression capability in transient protection circuits
Total Power Dissipation P_tot	500 mW at T_amb = 50 °C - sets maximum steady-state thermal loading on PCB layout
Reverse Current I_R	200 nA max at V_R = 7 V - ensures low leakage in high-impedance reference nodes

Pinout & Package

Hermetically sealed axial-leaded glass package: SOD27 (JEDEC DO-35), 2-terminal device with cathode identified by a colored band. Leads are tinned copper-clad steel; body diameter 1.85 mm, length 4.25 mm, lead spacing 25.4 mm.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / low-side connection in Zener configuration	Connected to ground or lower potential node when used as shunt regulator
Cathode	Reverse breakdown terminal / regulated output node	Marked with band; connects to input rail and load; provides stabilized 20 V reference

Key Features

Feature	Design Value
±5% Zener voltage tolerance	Enables cost-effective voltage referencing where tight regulation is not critical, e.g., power supply feedback or threshold detection
500 mW total power rating	Supports operation in low-to-medium power analog circuits without forced cooling or heatsinking
SOD27 (DO-35) glass package	Provides hermetic sealing and long-term stability for industrial environments with humidity or thermal cycling
Non-repetitive 40 W surge rating	Allows integration into basic overvoltage clamp circuits without external TVS devices
Low 200 nA reverse leakage at 7 V	Maintains accuracy in high-impedance bias networks and battery-powered sensor references

Applications

Power Supply Feedback Loop

Overvoltage Clamp Circuit

Use Scenario: Stabilizing output voltage in linear regulators or switching converter feedback paths using resistive divider and error amplifier.

IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 20 V reference point for comparator or op-amp input.

Use Value: Enables accurate output regulation within ±5% tolerance without requiring active compensation or trimming.

Use Scenario: Protecting downstream ICs from transient overvoltage events on 24 V DC rails in industrial control modules.

IC Role / Device Role / Timing Role: Passive clamping element that conducts above 20 V to divert surge energy to ground.

Use Value: Absorbs 40 W non-repetitive surges (100 μs) without failure, reducing need for additional TVS components.

Reference Voltage Source

Signal Level Shifting

Use Scenario: Generating stable bias voltages for op-amp input stages or ADC reference buffers in data acquisition systems.

IC Role / Device Role / Timing Role: Low-drift Zener source delivering 20 V reference with +12.3 mV/K tempco for calibration-critical nodes.

Use Value: Provides predictable thermal behavior for temperature-compensated designs operating from −65 °C to +200 °C.

Use Scenario: Translating logic-level signals between 3.3 V microcontrollers and 20 V analog subsystems in mixed-voltage instrumentation.

IC Role / Device Role / Timing Role: Bidirectional level translator using forward conduction (0.9 V drop) and reverse breakdown (20 V clamp).

Use Value: Achieves robust signal translation with minimal component count and no active circuitry required.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX79-B20,113	±2% tolerance (19.6–20.4 V), lower r_dif (≤150 Ω), tighter tempco (±0.5 mV/K)	Higher precision reference needed; reduced regulation error in feedback loops	Select when voltage accuracy > ±2% is required and cost premium is acceptable
1N4746A	20 V nominal, ±5%, 1 W power rating, DO-41 package, higher thermal resistance (500 K/W)	Higher power handling but larger footprint; less suitable for space-constrained PCBs	Select when 1 W continuous dissipation is needed and axial DO-41 fit is available

Compared with BZX79-C20,113, the BZX79-B20,113 offers superior voltage accuracy and lower dynamic impedance for precision regulation, while the 1N4746A trades smaller size for higher power capacity and relaxed thermal performance - making each suitable for distinct trade-offs between accuracy, size, and power.

Availability

BZX79-C20,113 is available at Aetrix Electronics and suitable for industrial power supplies, analog sensor interfaces, and embedded voltage reference circuits requiring stable component supply and long-lifecycle support.

Supply support for BZX79-C20,113 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 consumer markets.

The BZX79 series belongs to Nexperia's Zener diode product line, engineered for cost-sensitive, low-power voltage regulation and reference applications where reliability, consistency, and legacy compatibility are essential.

FAQ

What is the maximum continuous power dissipation for BZX79-C20,113?

The BZX79-C20,113 has a maximum total power dissipation of 500 mW at ambient temperature of 50 °C with standard PCB mounting (no metallization pad, lead length ≤8 mm). At higher ambient temperatures, derating applies per the thermal resistance of 380 K/W.

How does the temperature coefficient affect regulation accuracy?

The BZX79-C20,113 exhibits a typical temperature coefficient of +12.3 mV/K, meaning its Zener voltage increases by ~12.3 mV per °C rise in junction temperature. This must be accounted for in wide-temperature-range applications, especially where regulation stability beyond ±1% is required.

Can BZX79-C20,113 be used in surface-mount designs?

No - BZX79-C20,113 uses an axial-leaded SOD27 (DO-35) glass package designed exclusively for through-hole mounting. For surface-mount equivalents, consider Nexperia's PZM series (e.g., PZM20A) in SOT23 or SOD123 packages with comparable 20 V Zener characteristics.

What is the reverse leakage current at 7 V?

At V_R = 7 V and T_j = 25 °C, the maximum reverse leakage current for BZX79-C20,113 is 200 nA. This low leakage supports use in high-impedance reference networks and battery-operated circuits where standby current must be minimized.

BZX79-C20,113 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):: 20 V

Tolerance:: ±5%

Power - Max:: 400 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 ~ 200°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: ALF2

BZX79-C20,113 FAQ

1.How can I place an order for BZX79-C20,113 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX79-C20,113 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-C20,113 reliable?

The price and inventory of BZX79-C20,113 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-C20,113 is usually 5 days.

3.What payment methods are accepted for BZX79-C20,113?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-C20,113 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX79-C20,113?

BZX79-C20,113 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX79-C20,113 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-C20,113?

For technical support, including BZX79-C20,113 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-C20,113 requirements.

6.How does Aetrix verify that BZX79-C20,113 is sourced from the original manufacturer or authorized distributors?

All BZX79-C20,113 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-C20,113 meets industry standards.

7.What is the process for return or replacement of BZX79-C20,113?

All BZX79-C20,113 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-C20,113, 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-C20,113 part is unused and in its original packaging.

Return procedure for BZX79-C20,113:

1.Submit a request within 90 days.

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

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