Nexperia USA Inc. BZX79-B2V7,143

Overview

BZX79-B2V7,143 from Nexperia is a ±2% tolerance Zener voltage regulator diode in a hermetically sealed SOD27 (DO-35) glass package, rated for 2.7 V nominal Zener voltage at 5 mA test current, 500 mW total power dissipation at 50 °C ambient, and 20 μA reverse leakage at 1 V reverse bias - used as a precision low-voltage reference in analog sensor signal conditioning circuits.

For engineers reviewing the BZX79-B2V7,143 datasheet, BZX79-B2V7,143 pinout, BZX79-B2V7,143 application, or BZX79-B2V7,143 equivalent, this part serves as a stable 2.7 V shunt reference in space-constrained linear regulators, battery monitoring IC bias networks, and overvoltage protection threshold detectors where tight voltage tolerance and low temperature coefficient are required.

Technical Context

This Zener diode operates in reverse breakdown mode with a specified differential resistance of 300 Ω (max) at 5 mA, enabling predictable dynamic impedance behavior under varying load conditions. Its temperature coefficient is −3.5 mV/K (min) to −2.0 mV/K (max), indicating negative drift with rising junction temperature - critical for thermal stability in unregulated DC supplies.

The device supports non-repetitive peak reverse power dissipation up to 40 W for 100 μs pulses, allowing transient surge suppression capability when paired with series current-limiting resistors. It is characterized at T_j = 25 °C, with storage temperature range from −65 °C to +200 °C and maximum junction temperature of +200 °C.

Key Specifications

Pinout & Package

Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode indicated by a dark band. Leads are tinned copper-clad steel; body diameter 1.85 mm, length 4.25 mm, lead spacing 25.4 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX79-B2V7,143, MMBZ5221BS-7-F trades voltage accuracy and power for miniaturization, while BZX84-B2V7,215 retains voltage spec but sacrifices thermal robustness and dynamic regulation performance in compact form factor.

Availability

BZX79-B2V7,143 is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB-C protection circuits, RTC backup supplies, and automotive cabin sensor biasing requiring stable component supply across multi-year production cycles.

Supply support for BZX79-B2V7,143 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, focused on high-volume, high-reliability components for automotive, industrial, and computing markets.

The BZX79 series belongs to Nexperia's legacy Zener regulator portfolio, designed specifically for cost-effective, stable low-voltage referencing in through-hole assembled power management and signal conditioning circuits.

FAQ

What is the maximum continuous Zener current for BZX79-B2V7,143 at 50 °C ambient?

The device is rated for 500 mW total power dissipation at T_amb = 50 °C. At its nominal 2.7 V Zener voltage, this corresponds to a maximum continuous Zener current of approximately 185 mA (500 mW ÷ 2.7 V). Exceeding this value risks thermal runaway due to junction temperature rise beyond 200 °C.

Does BZX79-B2V7,143 have a defined forward voltage specification?

Yes - the datasheet specifies a maximum forward voltage (V_F) of 0.9 V at I_F = 10 mA and T_j = 25 °C. This value is relevant for polarity-check circuits or ESD protection configurations where forward conduction may occur, but the device is not intended for regular forward-biased operation.

Can BZX79-B2V7,143 be used in surface-mount designs?

No - it uses the axial-leaded SOD27 (DO-35) glass package, which is strictly through-hole mountable. For SMT equivalents, consider the BZX84-B2V7,215 (SOT-23) or MMBZ5221BS-7-F (SOT-323), both offering similar voltage specs but differing in power rating, tolerance, and thermal performance.

How does the temperature coefficient affect regulation accuracy over −40 °C to +85 °C?

With a specified S_Z range of −3.5 to −2.0 mV/K, the Zener voltage decreases by 0.34 V to 0.48 V across a 125 K span (−40 °C to +85 °C). That represents a −12.6% to −17.8% shift from nominal 2.7 V - making it suitable only for applications where such drift is compensated or acceptable within system-level error budgets.