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

Nexperia USA Inc. BZX79-B39,113

Name: BZX79-B39,113
Brand: Nexperia USA Inc.
SKU: BZX79-B39,113
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX79-B39,113

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX79-B39,113.pdf

Description:: DIODE ZENER 39V 400MW ALF2

Quantity:: RFQ Add To RFQ list

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Inventory:9,334

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Product details

Overview

BZX79-B39,113 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal working voltage 39 V at I_Ztest = 2 mA, 80 Ω typical differential resistance, and −2.5 mV/K temperature coefficient. Packaged in hermetically sealed SOD27 (DO-35) glass axial package, it delivers stable low-power voltage reference for precision analog circuits and power supply feedback loops.

For engineers reviewing the BZX79-B39,113 datasheet, BZX79-B39,113 pinout, BZX79-B39,113 application, or BZX79-B39,113 equivalent, key selection criteria include Zener voltage tolerance, dynamic impedance, temperature coefficient, reverse leakage at specified VR, and non-repetitive surge capability under 100 μs pulses.

Technical Context

This device operates as a two-terminal shunt voltage regulator, maintaining a stable reverse-biased breakdown voltage across its cathode-anode terminals when current exceeds the test threshold (I_Ztest = 2 mA). Its junction temperature range spans −65 °C to +200 °C, and thermal resistance from junction to tie-point is 300 K/W with 8 mm lead length.

The BZX79-B39,113 exhibits a negative temperature coefficient of −2.5 mV/K at I_Z = 2 mA, indicating decreasing Zener voltage with rising temperature - a critical factor in thermally sensitive reference designs. Its 40 pF diode capacitance at 1 MHz and 0 V reverse bias supports stable operation in low-frequency regulation and filtering applications.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	38.2 V to 39.8 V at I_Ztest = 2 mA - defines precise regulation point for feedback or reference use
Differential Resistance r_dif	80 Ω typical at I_Ztest = 2 mA - determines output impedance and load regulation sensitivity
Temperature Coefficient S_Z	−2.5 mV/K at I_Z = 2 mA - quantifies voltage drift per degree Celsius in thermal environments
Reverse Current I_R	50 nA max at V_R = 0.7 × V_Znom = 27.3 V - ensures minimal leakage in high-impedance bias networks
Non-repetitive Peak Reverse Current I_ZSM	0.7 A at t_p = 100 μs - supports transient overvoltage clamping without failure
Total Power Dissipation P_tot	500 mW at T_amb = 50 °C - sets continuous DC power handling limit on PCB
Diode Capacitance C_d	45 pF max at f = 1 MHz, V_R = 0 V - impacts high-frequency stability in oscillator or filter nodes

Pinout & Package

Hermetically sealed SOD27 (DO-35) glass axial package with cathode identified by a single black band. Leads are tinned copper-clad steel, suitable for through-hole soldering. Package dimensions: D = 4.25 mm max, L = 25.4 mm min, b = 0.56 mm max, G1 = 1.85 mm max.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unbanded end)	Current entry terminal in forward bias; reference ground node in shunt regulation	Connected to circuit ground or lower-potential rail when used as voltage reference
Cathode (banded end)	Breakdown voltage terminal; Zener voltage appears between cathode and anode	Connected to regulated node or error amplifier input in feedback topology

Key Features

Feature	Design Value
±2% Zener voltage tolerance	Enables tight regulation without post-manufacturing trimming in cost-sensitive analog references
Hermetic glass SOD27 package	Provides long-term reliability and moisture resistance in industrial and automotive ambient conditions
500 mW total power dissipation	Supports robust operation in 5–12 V auxiliary supplies and sensor excitation circuits
Low 50 nA reverse leakage at 27.3 V	Minimizes error current in high-impedance op-amp reference inputs and battery-monitoring dividers
−2.5 mV/K temperature coefficient	Allows predictable compensation in temperature-stable voltage references using matched components

Applications

Industrial Sensor Signal Conditioning

Automotive ECU Reference Supply

Use Scenario: Precision bridge sensor excitation and offset nulling in pressure/temperature transducers.

IC Role / Device Role / Timing Role: Shunt voltage reference for op-amp biasing and ADC reference scaling.

Use Value: ±2% V_Z tolerance and low 50 nA leakage ensure sub-0.1% full-scale error in 16-bit measurement systems.

Use Scenario: Stable 39 V reference for microcontroller reset supervision and CAN transceiver biasing.

IC Role / Device Role / Timing Role: Zener clamp and voltage monitor in 12 V/24 V vehicle subsystems.

Use Value: 0.7 A non-repetitive surge rating protects against load-dump transients while maintaining regulation integrity.

Programmable Power Supply Feedback

LED Driver Current Sense Reference

Use Scenario: Adjustable output voltage setting in isolated flyback or buck-boost converters.

IC Role / Device Role / Timing Role: Precision voltage reference for optocoupler-based secondary-side feedback loop.

Use Value: 80 Ω differential resistance ensures minimal output voltage shift across 1–10 mA feedback current range.

Use Scenario: Fixed-voltage reference for current-sense amplifier bias in constant-current LED drivers.

IC Role / Device Role / Timing Role: Stable reference node for high-side current sense resistor divider.

Use Value: −2.5 mV/K tempco enables predictable compensation when paired with NTC thermistors in thermal foldback circuits.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4739A	Same 39 V nominal V_Z, but ±5% tolerance and higher 100 Ω r_dif	Lower accuracy; suited for non-critical biasing where cost dominates	Select when ±5% regulation suffices and legacy footprint compatibility is required
BZX84-C39	SOT-23 surface-mount package; same ±5% tolerance; 90 Ω r_dif; 300 mW P_tot	Not pin-compatible; requires PCB redesign; optimized for space-constrained portable electronics	Choose for automated assembly and board area reduction where through-hole is not mandated

Compared with 1N4739A and BZX84-C39, BZX79-B39,113 offers tighter ±2% tolerance and higher 500 mW power rating in a proven through-hole package - making it optimal for industrial-grade analog references requiring long-term stability and thermal resilience.

Availability

BZX79-B39,113 is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive ECU reference supplies, and programmable power supply feedback requiring stable component supply and long-lifecycle support.

Supply support for BZX79-B39,113 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, logic, and PowerMOS semiconductors, serving automotive, industrial, computing, and consumer markets with high-reliability, high-volume production expertise.

The BZX79 series belongs to Nexperia's standard Zener diode product line, engineered for precision low-power voltage regulation and reference applications in harsh ambient environments.

FAQ

What is the maximum continuous reverse power dissipation for BZX79-B39,113 at 50 °C ambient?

The maximum continuous reverse power dissipation is 500 mW when mounted on a PCB without metallization pad and with lead length ≤8 mm at T_amb = 50 °C. This rating assumes tie-point temperature ≤50 °C and reflects derating behavior above that ambient temperature.

How does the temperature coefficient affect regulation accuracy over −40 °C to +125 °C?

With a typical temperature coefficient of −2.5 mV/K at I_Z = 2 mA, the Zener voltage decreases by approximately 413 mV across a 165 K range. Actual drift depends on operating current and thermal coupling; design margins must account for this linear coefficient plus curvature effects beyond 25 °C.

Can BZX79-B39,113 be used in parallel for higher power handling?

No - Zener diodes exhibit manufacturing variations in V_Z and r_dif, causing current imbalance and thermal runaway when paralleled. For higher power, use a single higher-rated Zener or implement active regulation with a pass transistor instead.

Is the SOD27 package RoHS compliant and lead-free?

Yes - Nexperia's BZX79-B39,113 in SOD27 package meets RoHS Directive 2011/65/EU and is lead-free, with lead finish conforming to JEDEC J-STD-609 Category 1 (SnAgCu or SnBi). Full compliance documentation is available via Nexperia's product change notifications.

BZX79-B39,113 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):: 39 V

Tolerance:: ±2%

Power - Max:: 400 mW

Impedance (Max) (Zzt):: 130 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 27.3 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-B39,113 FAQ

1.How can I place an order for BZX79-B39,113 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX79-B39,113 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-B39,113 reliable?

The price and inventory of BZX79-B39,113 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B39,113 is usually 5 days.

3.What payment methods are accepted for BZX79-B39,113?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B39,113 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX79-B39,113?

BZX79-B39,113 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX79-B39,113 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-B39,113?

For technical support, including BZX79-B39,113 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B39,113 requirements.

6.How does Aetrix verify that BZX79-B39,113 is sourced from the original manufacturer or authorized distributors?

All BZX79-B39,113 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-B39,113 meets industry standards.

7.What is the process for return or replacement of BZX79-B39,113?

All BZX79-B39,113 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B39,113, 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-B39,113 part is unused and in its original packaging.

Return procedure for BZX79-B39,113:

1.Submit a request within 90 days.

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

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