Nexperia USA Inc. BZX79-B3V6,143

Overview

BZX79-B3V6,143 from Nexperia is a ±2% tolerance Zener voltage regulator diode in a hermetically sealed SOD27 (DO-35) glass package, rated for 3.6 V nominal Zener voltage at 5 mA test current, 375 Ω typical differential resistance, and −2.4 mV/K temperature coefficient. It delivers stable low-voltage reference or stabilization in power supply feedback paths, sensor biasing circuits, and overvoltage protection clamps.

For engineers reviewing the BZX79-B3V6,143 datasheet, BZX79-B3V6,143 pinout, BZX79-B3V6,143 application, or BZX79-B3V6,143 equivalent, this page provides verified electrical parameters, thermal limits, reverse leakage behavior at VR = 1 V (≤5 μA), and direct substitution guidance against industry-standard 3.6 V Zeners with matched tolerance and package.

Technical Context

This device operates as a two-terminal, silicon planar Zener diode optimized for low-power voltage regulation. Its breakdown mechanism is predominantly Zener-dominated below 5.6 V, resulting in a negative temperature coefficient (−2.4 mV/K at IZ = 5 mA), enabling predictable drift compensation in precision references.

The SOD27 package supports axial lead mounting on PCBs without metallization pads, with thermal resistance Rth j-a = 380 K/W (lead length ≤8 mm). Non-repetitive surge capability is defined for 100 μs square-wave pulses up to 40 W, while continuous dissipation is limited to 400 mW at Tamb = 50 °C (note 1) or 500 mW at Tamb = 50 °C with tie-point cooling (note 2).

Key Specifications

Pinout & Package

Two-terminal axial-leaded device in SOD27 (DO-35) hermetically sealed glass package. Cathode identified by a dark band on the glass body. No internal bonding wires or substrate connections beyond anode/cathode leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX79-B3V6,143, the 1N4728A offers lower dynamic impedance but sacrifices tolerance and thermal performance; the BZX55C3V6 matches the package and nominal voltage but lacks the tight ±2% control and low-drift TC needed for precision references.

Availability

BZX79-B3V6,143 is available at Aetrix Electronics and suitable for power supply feedback references, sensor biasing networks, overvoltage clamps, and reset circuit threshold setters requiring stable component supply across industrial automation, medical instrumentation, and embedded control designs.

Supply support for BZX79-B3V6,143 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, with core expertise in high-volume, high-reliability diodes, MOSFETs, and logic devices.

The BZX79 series belongs to Nexperia's voltage regulator diode product line, engineered specifically for low-power, precision voltage reference and stabilization in cost-sensitive, space-constrained applications across automotive, industrial, and consumer electronics.

FAQ

What is the maximum continuous power dissipation for BZX79-B3V6,143 at 50 °C ambient?

The maximum continuous power dissipation is 400 mW when mounted on a PCB without metallization pad and with lead length ≤8 mm (per note 1 in the datasheet). With tie-point cooling at the same ambient temperature, it rises to 500 mW (note 2). Exceeding either limit risks thermal runaway and permanent parameter shift.

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

This negative coefficient means the Zener voltage decreases by 2.4 mV per Kelvin rise in junction temperature. In a 3.3 V supply reference, a 50 °C rise causes ~120 mV drop - requiring compensation in high-accuracy systems via resistor networks or complementary TC components to maintain regulation stability.

Can BZX79-B3V6,143 replace BZX79-C3V6 in existing designs?

Yes, physically and electrically - both share identical SOD27 packaging and 3.6 V nominal voltage - but BZX79-B3V6,143 offers tighter ±2% tolerance versus ±5% for the 'C' variant. Substitution improves reference accuracy but may require revalidation of worst-case voltage margins in safety-critical clamping functions.

Is the cathode marked on the BZX79-B3V6,143 package?

Yes - the cathode is unambiguously identified by a dark band on the glass body of the SOD27 (DO-35) package. This marking aligns with JEDEC DO-35 standards and must be oriented toward the higher potential node in reverse-bias regulation configurations.