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

Nexperia USA Inc. BZX79-B3V3,143

Name: BZX79-B3V3,143
Brand: Nexperia USA Inc.
SKU: BZX79-B3V3,143
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX79-B3V3,143

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX79-B3V3,143.pdf

Description:: DIODE ZENER 3.3V 400MW ALF2

Quantity:: RFQ Add To RFQ list

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Inventory:4,880

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Product details

Overview

BZX79-B3V3,143 from Nexperia is a ±2% tolerance Zener voltage regulator diode in a hermetically sealed SOD27 (DO-35) glass package, rated for 3.3 V nominal Zener voltage at 5 mA test current, 500 mW total power dissipation at 50 °C ambient, and 350 Ω typical differential resistance. It serves as a low-power voltage reference or stabilization element in linear power supplies, sensor biasing circuits, and overvoltage protection clamps.

For engineers reviewing the BZX79-B3V3,143 datasheet, BZX79-B3V3,143 pinout, BZX79-B3V3,143 application, or BZX79-B3V3,143 equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal resistance (380 K/W), reverse leakage (5 μA at VR = 1 V), and non-repetitive surge capability (6.0 A peak reverse current).

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation across its specified test current range. Its temperature coefficient of −2.4 mV/K at 5 mA enables predictable drift behavior in precision reference designs, while its 350 Ω differential resistance ensures stable regulation under moderate load variation.

The device uses axial-leaded SOD27 packaging with cathode band marking, optimized for through-hole mounting on PCBs without metallization pads. Thermal performance is defined by junction-to-ambient resistance of 380 K/W and junction-to-tie-point resistance of 300 K/W, supporting reliable operation up to +200 °C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	3.23 V to 3.37 V at I_Z = 5 mA - defines precise DC reference point for analog circuitry
Power Dissipation (P_tot)	500 mW at T_amb = 50 °C - sets maximum continuous power handling in standard PCB layout
Differential Resistance (r_dif)	350 Ω typical at I_Z = 5 mA - determines output impedance and regulation sensitivity to current changes
Reverse Leakage (I_R)	5 μA max at V_R = 1 V - limits parasitic current draw in high-impedance bias networks
Temperature Coefficient (S_Z)	−2.4 mV/K at I_Z = 5 mA - quantifies voltage drift per degree Celsius for thermal stability analysis
Non-repetitive Peak Current (I_ZSM)	6.0 A at t_p = 100 μs - supports transient overvoltage clamping without failure
Junction Temperature Range	−65 °C to +200 °C - enables operation in extended industrial and automotive environments

Pinout & Package

Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode band marking; lead length ≤ 8 mm for thermal derating compliance.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / low-side connection in Zener configuration	Connected to lower potential node when used in reverse-biased regulation
Cathode	Zener breakdown terminal / high-side connection in Zener configuration	Marked with band; connected to higher potential node to enable reverse conduction and voltage clamping

Key Features

Feature	Design Value
±2% Zener voltage tolerance	Enables tighter regulation than ±5% variants (e.g., BZX79-C3V3), reducing calibration overhead in precision references
500 mW power rating at 50 °C ambient	Supports higher continuous dissipation than standard 400 mW variants, improving margin in compact layouts
Low 5 μA reverse leakage at 1 V	Minimizes error contribution in high-impedance voltage divider or sensor bias applications
−2.4 mV/K temperature coefficient	Provides predictable negative drift for compensation schemes in temperature-sensitive analog circuits
SOD27 (DO-35) hermetic glass package	Ensures long-term reliability and moisture resistance in harsh industrial environments

Applications

Power Supply Reference

Sensor Biasing

Use Scenario: Stabilizing feedback voltage in low-current linear regulators or shunt-based LDOs.

IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp output voltage at 3.3 V.

Use Value: Provides stable 3.3 V reference with ±2% tolerance and low thermal drift, enabling accurate output regulation without external ICs.

Use Scenario: Setting bias point for analog sensors (e.g., thermistors, RTDs) in measurement front-ends.

IC Role / Device Role / Timing Role: Precision voltage reference establishing known excitation level for resistive sensor elements.

Use Value: Low 5 μA leakage avoids loading high-impedance sensor bridges, preserving measurement accuracy.

Overvoltage Clamp

Microcontroller Reset Circuit

Use Scenario: Protecting input pins of analog-to-digital converters or op-amps from ESD or supply transients.

IC Role / Device Role / Timing Role: Shunt clamping device limiting voltage to 3.3 V during surge events.

Use Value: 6.0 A non-repetitive peak current rating allows safe absorption of 100 μs transients without degradation.

Use Scenario: Generating clean reset signal for 3.3 V microcontrollers during power-up or brownout conditions.

IC Role / Device Role / Timing Role: Voltage reference defining threshold for external reset supervisor or RC timing network.

Use Value: Tight ±2% tolerance ensures consistent reset assertion across temperature and unit variance, preventing spurious resets.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX79-C3V3,113	±5% tolerance (3.1 V–3.5 V), higher 10 μA reverse leakage at VR = 1 V	Acceptable where cost sensitivity outweighs precision requirements	Select for cost-driven consumer electronics where ±5% regulation suffices
MMBZ5226BS,215	SOT-23 surface-mount package, same 3.3 V nominal, ±5% tolerance, 100 mW P_tot	Requires PCB redesign for SMT assembly; unsuitable for through-hole legacy systems	Choose only when board space constraints mandate SMT and lower power is acceptable

Compared with BZX79-C3V3,113 and MMBZ5226BS,215, the BZX79-B3V3,143 delivers superior voltage accuracy and higher power handling in a proven through-hole package-critical for industrial analog references where long-term stability and thermal robustness are prioritized over footprint size or unit cost.

Availability

BZX79-B3V3,143 is available at Aetrix Electronics and suitable for linear power supplies, sensor interface circuits, overvoltage protection networks, and microcontroller reset generation requiring stable component supply and long-lifecycle support.

Supply support for BZX79-B3V3,143 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, engineered for precision low-power voltage referencing and stabilization in cost-sensitive yet thermally demanding applications.

FAQ

What is the maximum continuous power dissipation for BZX79-B3V3,143?

The BZX79-B3V3,143 has a maximum total power dissipation of 500 mW at an ambient temperature of 50 °C with leads trimmed to 8 mm. At higher ambient temperatures, derating applies per the thermal resistance of 380 K/W; for example, at 70 °C ambient, usable power drops to approximately 395 mW.

How does the −2.4 mV/K temperature coefficient affect circuit performance?

The −2.4 mV/K coefficient means the Zener voltage decreases by 2.4 mV for every 1 °C rise in junction temperature at 5 mA test current. In a 3.3 V reference, this results in ~−0.073% drift per °C-critical for applications requiring <0.5% total error across −40 °C to +85 °C operating range.

Can BZX79-B3V3,143 be used in surface-mount designs?

No-BZX79-B3V3,143 uses the axial-leaded SOD27 (DO-35) through-hole package and is not compatible with SMT assembly. For surface-mount equivalents, consider the MMBZ5226BS (SOT-23) or BZX384-B3V3 (SOD-323), though both differ in tolerance, power rating, and thermal characteristics.

What is the significance of the "143" suffix in the part number?

The "143" is Nexperia's internal ordering code denoting tape-and-reel packaging (12 mm tape width, 3000 units per reel) and RoHS-compliant finish. It does not affect electrical specifications but identifies the physical packaging format and environmental compliance status required for automated assembly.

BZX79-B3V3,143 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

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

Packaging:: Cut Tape (CT)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 3.3 V

Tolerance:: ±2%

Power - Max:: 400 mW

Impedance (Max) (Zzt):: 95 Ohms

Current - Reverse Leakage @ Vr:: 5 µA @ 1 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-B3V3,143 FAQ

1.How can I place an order for BZX79-B3V3,143 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX79-B3V3,143 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-B3V3,143 reliable?

The price and inventory of BZX79-B3V3,143 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B3V3,143 is usually 5 days.

3.What payment methods are accepted for BZX79-B3V3,143?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B3V3,143 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX79-B3V3,143?

BZX79-B3V3,143 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX79-B3V3,143 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-B3V3,143?

For technical support, including BZX79-B3V3,143 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B3V3,143 requirements.

6.How does Aetrix verify that BZX79-B3V3,143 is sourced from the original manufacturer or authorized distributors?

All BZX79-B3V3,143 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-B3V3,143 meets industry standards.

7.What is the process for return or replacement of BZX79-B3V3,143?

All BZX79-B3V3,143 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B3V3,143, 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-B3V3,143 part is unused and in its original packaging.

Return procedure for BZX79-B3V3,143:

1.Submit a request within 90 days.

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

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