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

Nexperia USA Inc. BZX79-B56,113

Name: BZX79-B56,113
Brand: Nexperia USA Inc.
SKU: BZX79-B56,113
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX79-B56,113

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX79-B56,113.pdf

Description:: DIODE ZENER 56V 400MW ALF2

Quantity:: RFQ Add To RFQ list

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Inventory:9,970

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Product details

Overview

BZX79-B56,113 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal breakdown voltage of 56 V at 2 mA test current, differential resistance of 100 Ω (max), and temperature coefficient of +42.2 mV/K (typical). Packaged in hermetically sealed SOD27 (DO-35) glass axial package, it delivers stable low-power voltage reference for precision biasing and overvoltage protection in linear power supplies and sensor interfaces.

For engineers reviewing the BZX79-B56,113 datasheet, BZX79-B56,113 pinout, BZX79-B56,113 application, or BZX79-B56,113 equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal resistance (380 K/W), non-repetitive peak reverse power (40 W), junction temperature range (−65 to +200 °C), and cathode-marked axial lead configuration.

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation across its specified test current range (2 mA). Its positive temperature coefficient (+42.2 mV/K) enables predictable drift compensation in temperature-sensitive references.

The device uses a silicon PN junction fabricated for low leakage (≤50 nA at 0.7×V_Znom) and stable differential resistance (100 Ω max), optimized for DC stabilization rather than high-frequency clamping. Thermal performance is defined under standard PCB mounting conditions (lead length ≤8 mm, no metallization pad).

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	54.9 V to 57.1 V at I_Z = 2 mA - ensures precise DC reference within ±2% tolerance band
Differential Resistance r_dif	100 Ω max at I_Z = 2 mA - limits output impedance for stable regulation under load variation
Temperature Coefficient S_Z	+42.2 mV/K typical at I_Z = 2 mA - enables predictable thermal drift modeling in reference circuits
Reverse Leakage I_R	50 nA max at V_R = 39.2 V (0.7×56 V) - minimizes parasitic current in high-impedance bias networks
Total Power Dissipation P_tot	500 mW at T_amb = 50 °C - defines continuous DC power handling on standard PCB layout
Non-repetitive Peak Power P_ZSM	40 W at t_p = 100 μs - supports transient overvoltage suppression without failure
Junction Temperature Range T_j	−65 °C to +200 °C - allows operation in extended industrial and automotive ambient environments

Pinout & Package

Hermetically sealed SOD27 (DO-35) axial glass package with cathode indicated by a colored band on one end; leads are tinned copper alloy, suitable for through-hole soldering.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unbanded end)	Forward conduction terminal / low-impedance path during forward bias	Connects to lower potential node in reverse-biased Zener configuration; used for polarity verification
Cathode (banded end)	Zener breakdown terminal / regulated voltage output node	Connected to reference point; voltage at this terminal is stabilized at V_Z when reverse biased above knee

Key Features

Feature	Design Value
±2% Zener voltage tolerance	Enables tight DC reference accuracy without post-calibration in analog sensor signal chains
Hermetic SOD27 glass package	Guarantees long-term parameter stability and moisture resistance in harsh industrial environments
Low reverse leakage (50 nA)	Preserves high-impedance node integrity in battery-powered or micropower monitoring circuits
40 W non-repetitive surge rating	Provides robustness against ESD and line transients in unprotected input stages without external TVS
Positive temperature coefficient	Allows predictable drift compensation when paired with negative-coefficient components in reference designs

Applications

Linear Power Supply Reference

Sensor Biasing Circuit

Use Scenario: Stabilizing feedback voltage in 78xx-style linear regulators or discrete transistor-based shunt regulators.

IC Role / Device Role / Timing Role: Zener diode provides fixed reference voltage to error amplifier input or base bias network.

Use Value: Maintains output regulation within ±1% over temperature due to tight ±2% V_Z tolerance and known S_Z.

Use Scenario: Supplying stable excitation voltage to resistive bridge sensors (e.g., strain gauges, RTDs) in data acquisition modules.

IC Role / Device Role / Timing Role: Acts as low-noise, low-drift voltage source for sensor excitation, minimizing measurement offset drift.

Use Value: 50 nA leakage and +42.2 mV/K S_Z allow accurate thermal drift modeling and compensation in firmware.

Overvoltage Protection Clamp

Microcontroller Reset Circuit

Use Scenario: Clamping transient surges on 48 V industrial bus lines before entering DC-DC converter inputs.

IC Role / Device Role / Timing Role: Shunts excess energy during voltage spikes using non-repetitive 40 W surge capability.

Use Value: Withstands 100 μs transients up to 40 W without degradation, eliminating need for additional TVS in cost-sensitive designs.

Use Scenario: Generating clean, temperature-compensated reset threshold for 3.3 V or 5 V microcontrollers in embedded control units.

IC Role / Device Role / Timing Role: Forms part of resistor-divider network feeding supervisor IC or MCU's reset pin.

Use Value: Stable 56 V Zener voltage enables precise scaling to sub-1 V thresholds with minimal drift over −40 °C to +85 °C.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4744A	14 V Zener voltage, ±5% tolerance, DO-41 package, 1 W P_tot	Lower voltage, higher power, looser tolerance - unsuitable for precision 56 V reference	Select only if system requires 14 V clamping with higher continuous power margin
BZX85C56	56 V Zener, ±5% tolerance, DO-41 package, 1.3 W P_tot, higher leakage (500 nA)	Same nominal voltage but wider tolerance and larger package - less suitable for space-constrained PCBs	Choose when cost sensitivity outweighs precision and board space requirements

Compared with 1N4744A and BZX85C56, BZX79-B56,113 offers superior voltage accuracy (±2% vs ±5%), smaller SOD27 footprint, and lower leakage-making it optimal for precision 56 V references where board area and thermal stability are critical.

Availability

BZX79-B56,113 is available at Aetrix Electronics and suitable for linear power supply references, sensor biasing circuits, overvoltage protection clamps, and microcontroller reset circuits requiring stable component supply and long-lifecycle support.

Supply support for BZX79-B56,113 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.

BZX79-B56,113 belongs to the BZX79 series of low-power Zener diodes designed specifically for precision voltage regulation and reference applications in space-constrained, thermally demanding environments.

FAQ

What is the maximum continuous power dissipation for BZX79-B56,113?

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

How is the cathode identified on the BZX79-B56,113 package?

The cathode is marked by a distinct colored band on the glass body of the SOD27 (DO-35) package. This band must be oriented toward the higher-potential side of the circuit when used in reverse-biased Zener regulation mode.

Does BZX79-B56,113 have a positive or negative temperature coefficient?

BZX79-B56,113 has a positive temperature coefficient of +42.2 mV/K (typical) at I_Z = 2 mA. This means its Zener voltage increases predictably with rising junction temperature, enabling drift compensation in reference designs.

Can BZX79-B56,113 be used for transient voltage suppression?

Yes - it supports non-repetitive peak reverse power dissipation of 40 W for pulse durations up to 100 μs, making it suitable for clamping short-duration transients like ESD or switching spikes, though not intended for repetitive surge duty.

BZX79-B56,113 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):: 56 V

Tolerance:: ±2%

Power - Max:: 400 mW

Impedance (Max) (Zzt):: 200 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 39.2 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-B56,113 FAQ

1.How can I place an order for BZX79-B56,113 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX79-B56,113 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-B56,113 reliable?

The price and inventory of BZX79-B56,113 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B56,113 is usually 5 days.

3.What payment methods are accepted for BZX79-B56,113?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B56,113 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX79-B56,113?

BZX79-B56,113 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX79-B56,113 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-B56,113?

For technical support, including BZX79-B56,113 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B56,113 requirements.

6.How does Aetrix verify that BZX79-B56,113 is sourced from the original manufacturer or authorized distributors?

All BZX79-B56,113 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-B56,113 meets industry standards.

7.What is the process for return or replacement of BZX79-B56,113?

All BZX79-B56,113 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B56,113, 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-B56,113 part is unused and in its original packaging.

Return procedure for BZX79-B56,113:

1.Submit a request within 90 days.

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

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