Nexperia USA Inc. BZX79-B11,143

Overview

BZX79-B11,143 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal 11 V breakdown voltage at 5 mA test current, 50 Ω typical differential resistance, and −65 °C to +200 °C junction temperature range. It operates as a low-power precision voltage reference in biasing, feedback, and stabilization circuits for analog power supplies and sensor signal conditioning.

For engineers reviewing the BZX79-B11,143 datasheet, BZX79-B11,143 pinout, BZX79-B11,143 application, or BZX79-B11,143 equivalent, key selection factors include its 11.0 V nominal Zener voltage, ±2% tolerance, 500 mW total power dissipation at Tamb = 50 °C, DO-35 (SOD27) hermetically sealed glass package, and 100 nA reverse leakage at VR = 8 V.

Technical Context

This Zener diode functions in reverse-biased breakdown mode, delivering stable reference voltage under controlled current conditions. Its differential resistance of 50 Ω (typ.) at IZ = 5 mA ensures minimal output voltage variation across load changes, while the −65 °C to +200 °C operating junction temperature range supports industrial and automotive ambient environments.

The device exhibits a positive temperature coefficient of +5.4 mV/K (typ.) at IZ = 5 mA, enabling predictable thermal drift compensation in multi-diode reference networks. Its non-repetitive peak reverse power dissipation is rated at 40 W for 100 μs pulses, supporting transient overvoltage clamping in low-energy protection circuits.

Key Specifications

Pinout & Package

Hermetically sealed glass SOD27 (DO-35) package with axial leads; cathode identified by a dark band on the glass body. Leads are tinned copper-clad steel, suitable for wave or hand soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX79-B11,143, MMBZ5240B offers SMT compatibility but sacrifices tolerance and power handling; BZX84-C11 trades accuracy and thermal robustness for footprint reduction-neither matches the original's ±2% tolerance, 500 mW rating, and hermetic DO-35 reliability in demanding environments.

Availability

BZX79-B11,143 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, low-power microcontroller voltage reference, and automotive cabin control panel biasing requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for BZX79-B11,143 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, logic, and PowerMOS semiconductors, formed in 2017 from the former NXP Standard Products business, with focus on automotive, industrial, computing, and consumer markets.

The BZX79 series belongs to Nexperia's precision Zener voltage regulator portfolio, designed specifically for low-power, high-stability reference and stabilization applications in harsh-environment electronics.

FAQ

What is the maximum continuous power dissipation for BZX79-B11,143 at 70 °C ambient?

At 70 °C ambient, the BZX79-B11,143 must be derated linearly from its 500 mW rating at 50 °C using the 380 K/W thermal resistance. The allowable power drops to approximately 395 mW, calculated as P = (T_jmax − T_amb) / R_{th j-a} = (200 − 70) / 380 ≈ 0.342 W, but datasheet limits specify 400 mW at 50 °C and 300 mW at 75 °C, confirming ~350–375 mW at 70 °C.

Can BZX79-B11,143 replace BZX79-C11 in a precision reference design?

No-BZX79-C11 has ±5% tolerance (10.4–11.6 V), while BZX79-B11,143 guarantees 10.8–11.2 V. In a precision reference requiring <±0.2 V stability, the C-series introduces up to ±0.6 V error, exceeding typical 12-bit ADC full-scale tolerance. The B-series' tighter tolerance and lower r_diff make it mandatory for such applications.

Is the SOD27 package lead-free and RoHS compliant?

Yes-Nexperia confirms all BZX79-B series devices, including BZX79-B11,143, are manufactured in RoHS-compliant, lead-free processes per EU Directive 2011/65/EU. The SOD27 package uses lead-free tinning on copper-clad steel leads, verified in Nexperia's official compliance documentation dated 2021.

What is the typical Zener impedance at 1 mA versus 5 mA test current?

At I_Z = 1 mA, differential resistance is typically 100 Ω (per Table 1 extrapolation); at I_Z = 5 mA, it drops to 50 Ω (typ.). This halving reflects improved dynamic regulation under higher bias, directly impacting output impedance in active feedback networks and requiring appropriate current-setting resistor selection.