Nexperia USA Inc. BZX79-C11,133

Overview

BZX79-C11,133 from Nexperia is a ±5% tolerance Zener voltage regulator diode with nominal 11 V breakdown voltage at 8 V reverse bias, 100 nA maximum reverse leakage, 50–150 Ω differential resistance at 5 mA test current, and 500 mW total power dissipation in a hermetically sealed SOD27 (DO-35) glass package-used for low-power voltage reference and stabilization in analog sensor signal conditioning circuits.

For engineers reviewing the BZX79-C11,133 datasheet, BZX79-C11,133 pinout, BZX79-C11,133 application, or BZX79-C11,133 equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (380 K/W), non-repetitive peak reverse power (40 W), cathode identification via marking band, and compatibility with through-hole PCB assembly under 50 °C ambient conditions.

Technical Context

This Zener diode operates in reverse-bias breakdown mode to maintain stable DC voltage across its terminals under varying load or supply conditions. Its 11 V nominal Zener voltage is specified at I_Ztest = 5 mA, with temperature coefficient of +5.4 to +9.0 mV/K and typical junction capacitance of 10 pF at 0 V.

The device uses axial-leaded, hermetically sealed glass construction (SOD27/DO-35) with cathode indicated by a colored band. Thermal performance is defined per IEC 60134, with R_{th j-a} = 380 K/W (lead length ≤8 mm, no metallization pad), limiting continuous operation to ≤500 mW at T_amb = 50 °C.

Key Specifications

Pinout & Package

Hermetically sealed axial-leaded glass package (SOD27 / DO-35), 2-terminal device with cathode identified by a single color band on the 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 regulation applications.

Compared with 1N4740A, BZX79-C11,133 offers tighter board space fit and lower thermal resistance in DO-35 but lower power headroom; versus BZX79-C10,133, it provides 1 V higher reference with identical reliability and mounting-ideal for upgrading legacy 10 V references without layout change.

Availability

BZX79-C11,133 is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller reset circuits, analog front-end biasing, and legacy equipment calibration requiring stable component supply and long-lifecycle support.

Supply support for BZX79-C11,133 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, serving automotive, industrial, computing, and consumer markets.

The BZX79 series belongs to Nexperia's legacy Zener diode portfolio, designed specifically for low-power voltage regulation and reference applications in cost-sensitive, high-reliability analog systems.

FAQ

What is the maximum continuous reverse power dissipation for BZX79-C11,133 at 70 °C ambient?

At 70 °C ambient, the device exceeds its 500 mW rating at 50 °C and must be derated linearly. With R_{th j-a} = 380 K/W, maximum allowable P_tot drops to approximately 395 mW-calculated as (125 °C − 70 °C) / 380 K/W = 0.145 W, but datasheet specifies 500 mW only at T_amb ≤ 50 °C; operation above that requires thermal modeling or forced cooling.

How is cathode polarity identified on the BZX79-C11,133 package?

The cathode is marked by a single color band (typically black or dark gray) located near one end of the axial glass body. When mounted on PCB, the banded end connects to the more positive node in Zener shunt configurations-i.e., the regulated output side-and the unbanded lead is the anode, tied to ground or lower potential.

Can BZX79-C11,133 be used in surface-mount designs?

No-it is exclusively a through-hole device in SOD27 (DO-35) axial glass package. For SMT equivalents, consider Nexperia's MMBZ5242B (11 V, SOT-23) or PZM11NB (11 V, SOT-323), which share similar electrical specs but require footprint and reflow profile changes.

What is the typical Zener impedance at 1 mA operating current?

While datasheet specifies r_dif = 50–150 Ω at 5 mA, extrapolation from Fig.5 and Fig.6 shows impedance rises sharply below 2 mA. At 1 mA, typical differential resistance is ~220 Ω-confirmed by curve trends in the BZX79-C10 to C15 range-and must be accounted for in high-precision divider designs.