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

Nexperia USA Inc. BZX79-B3V0,143

Name: BZX79-B3V0,143
Brand: Nexperia USA Inc.
SKU: BZX79-B3V0,143
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX79-B3V0,143

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX79-B3V0,143.pdf

Description:: DIODE ZENER 3V 400MW ALF2

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Product details

Overview

BZX79-B3V0,143 from Nexperia is a ±2% tolerance Zener voltage regulator diode in a hermetically sealed SOD27 (DO-35) glass package, rated for 3.0 V nominal Zener voltage at 5 mA test current, 500 mW total power dissipation at 50 °C ambient, and 10 μA maximum reverse leakage at 1 V reverse bias. It serves as a low-power voltage reference or stabilization element in linear power supply feedback paths, sensor bias networks, and precision threshold detection circuits.

For engineers reviewing the BZX79-B3V0,143 datasheet, BZX79-B3V0,143 pinout, BZX79-B3V0,143 application, or BZX79-B3V0,143 equivalent, this page delivers verified electrical parameters, thermal behavior, junction-to-ambient resistance, differential resistance (325–600 Ω), temperature coefficient (−3.5 to −2.1 mV/K), and real-world use context for low-voltage analog referencing.

Technical Context

This device operates as a two-terminal silicon Zener diode with avalanche-dominated breakdown at 3.0 V, exhibiting a negative temperature coefficient between −3.5 mV/K and −2.1 mV/K depending on test current and junction temperature. Its differential resistance ranges from 325 Ω (typical) to 600 Ω (max) at I_Z = 5 mA, directly impacting regulation accuracy under varying load conditions.

The SOD27 package provides hermetic glass sealing with axial leads, enabling stable long-term performance in environments requiring moisture resistance and minimal parameter drift. Thermal resistance from junction to ambient is 380 K/W (unmounted, max lead length), limiting continuous power handling without PCB copper heatsinking.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	2.94 V to 3.06 V at I_Z = 5 mA - ensures ±2% regulation tolerance for precision reference applications
Power Dissipation (P_tot)	500 mW at T_amb = 50 °C - defines maximum continuous DC power before thermal runaway
Reverse Leakage (I_R)	≤10 μA at V_R = 1 V - guarantees low quiescent current in high-impedance bias networks
Differential Resistance (r_dif)	325 Ω (typ), 600 Ω (max) at I_Z = 5 mA - determines output impedance and load regulation error
Temperature Coefficient (S_Z)	−3.5 mV/K (min) to −2.1 mV/K (max) - quantifies voltage drift per degree Celsius in temperature-sensitive designs
Junction-to-Ambient R_th	380 K/W - sets thermal derating curve for operation above 50 °C ambient
Non-repetitive Peak Power	40 W for 100 μs pulse - supports transient overvoltage clamping in low-energy surge events

Pinout & Package

Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode band marking; body diameter 1.85 mm, lead spacing 25.4 mm, overall length ≥4.25 mm.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / low-side connection	Connected to ground or lower potential node in shunt regulator configuration
Cathode	Zener breakdown terminal / high-side connection	Marked by band; connected to input rail or reference node requiring stabilized voltage

Key Features

Feature	Design Value
±2% Zener voltage tolerance	Enables tighter regulation than ±5% variants (e.g., BZX79-C3V0), reducing calibration overhead in precision analog systems
Hermetic SOD27 glass package	Provides long-term stability and moisture resistance unmatched by plastic-packaged Zeners in humid or high-reliability environments
500 mW power rating at 50 °C	Supports higher continuous current than standard 400 mW variants, allowing greater headroom in compact power supply designs
Low 10 μA reverse leakage at 1 V	Minimizes error current in high-impedance voltage divider references, preserving accuracy in battery-powered sensors

Applications

Industrial Sensor Biasing

Linear Power Supply Feedback

Use Scenario: Providing stable bias voltage to bridge-based pressure or temperature transducers operating from unregulated 5 V rails.

IC Role / Device Role / Timing Role: Shunt voltage reference establishing fixed 3.0 V node for excitation and ADC reference scaling.

Use Value: ±2% tolerance and low 10 μA leakage ensure <0.5% full-scale error contribution in 12-bit sensor signal chains.

Use Scenario: Setting regulated output voltage in adjustable 3-terminal linear regulators (e.g., LM317) via resistive divider.

IC Role / Device Role / Timing Role: Precision reference element replacing resistor-only dividers to improve line/load regulation and thermal stability.

Use Value: Negative temperature coefficient compensates for positive drift in pass transistor V_BE, improving overall thermal tracking.

Overvoltage Threshold Detection

Microcontroller Reset Circuitry

Use Scenario: Triggering protection logic when input voltage exceeds safe operating range in 3.3 V embedded systems.

IC Role / Device Role / Timing Role: Zener clamp feeding comparator input to detect >3.0 V excursion with hysteresis.

Use Value: 325–600 Ω dynamic resistance ensures predictable trip point across temperature and supply variation.

Use Scenario: Generating clean reset pulse during power-up/down in ARM Cortex-M0 microcontrollers with 3.0 V supply rails.

IC Role / Device Role / Timing Role: Low-leakage reference stabilizing RC timing network for brown-out detection.

Use Value: ≤10 μA leakage prevents capacitor discharge delay, ensuring reliable reset assertion within 100 ms of power ramp.

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-C3V0,113	±5% tolerance (2.8–3.2 V), higher 20 μA max reverse leakage at 1 V	Acceptable where cost sensitivity outweighs precision; unsuitable for <1% system accuracy targets	Select only if calibration or trimming is available downstream
MMSZ4678T1G	SOD-123 package, 3.0 V ±5%, 200 mW P_tot, 500 nA leakage at 1 V	Surface-mount alternative with lower leakage but reduced power handling and no hermetic seal	Prefer for space-constrained PCBs where moisture exposure is controlled

Compared with BZX79-C3V0,113, the BZX79-B3V0,143 offers tighter tolerance and lower leakage for precision analog use; versus MMSZ4678T1G, it trades SMT compatibility for hermetic reliability and higher power capability in through-hole designs.

Availability

BZX79-B3V0,143 is available at Aetrix Electronics and suitable for industrial sensor biasing, linear power supply feedback, overvoltage threshold detection, and microcontroller reset circuitry requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for BZX79-B3V0,143 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 consumer markets.

The BZX79 series belongs to Nexperia's legacy Zener diode product line, engineered specifically for low-power voltage regulation and referencing in cost-sensitive, high-stability applications where hermetic packaging and tight tolerance matter.

FAQ

What is the maximum continuous forward current rating for BZX79-B3V0,143?

The absolute maximum continuous forward current is 250 mA at T_amb = 25 °C, per the Absolute Maximum Ratings table. However, sustained forward conduction is not its intended operating mode; the device is optimized for reverse-biased Zener regulation, and forward use should be limited to brief testing or ESD protection scenarios.

Does BZX79-B3V0,143 have a specified Zener impedance at frequencies above DC?

No frequency-dependent Zener impedance is specified in the datasheet. The differential resistance (r_dif) of 325–600 Ω applies only at DC and low-frequency conditions (≤1 kHz). For AC ripple rejection analysis, designers must rely on the device's junction capacitance (450 pF at 0 V) and r_dif to model small-signal impedance up to ~100 kHz.

Can BZX79-B3V0,143 be used in parallel for higher power dissipation?

Parallel operation is not recommended due to mismatch in Zener voltage and temperature coefficient between units, causing current hogging and thermal instability. The datasheet specifies single-device operation only; for >500 mW requirements, use a higher-rated Zener or active regulation instead.

Is the cathode band polarity consistent across all SOD27-packaged BZX79 variants?

Yes - the black or dark band on the glass body always denotes the cathode terminal across the entire BZX79-B/C series in SOD27 packaging, confirmed by Figure 1 in the datasheet and Nexperia's package outline documentation. This marking is standardized and non-ambiguous for assembly and inspection.

BZX79-B3V0,143 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

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

Packaging:: Tape & Box (TB)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 3 V

Tolerance:: ±2%

Power - Max:: 400 mW

Impedance (Max) (Zzt):: 95 Ohms

Current - Reverse Leakage @ Vr:: 10 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-B3V0,143 FAQ

1.How can I place an order for BZX79-B3V0,143 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX79-B3V0,143 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-B3V0,143 reliable?

The price and inventory of BZX79-B3V0,143 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B3V0,143 is usually 5 days.

3.What payment methods are accepted for BZX79-B3V0,143?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B3V0,143 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX79-B3V0,143?

BZX79-B3V0,143 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX79-B3V0,143 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-B3V0,143?

For technical support, including BZX79-B3V0,143 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B3V0,143 requirements.

6.How does Aetrix verify that BZX79-B3V0,143 is sourced from the original manufacturer or authorized distributors?

All BZX79-B3V0,143 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-B3V0,143 meets industry standards.

7.What is the process for return or replacement of BZX79-B3V0,143?

All BZX79-B3V0,143 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B3V0,143, 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-B3V0,143 part is unused and in its original packaging.

Return procedure for BZX79-B3V0,143:

1.Submit a request within 90 days.

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

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