Nexperia USA Inc. BZX79-C15,133

Overview

BZX79-C15,133 from Nexperia is a ±5% tolerance Zener voltage regulator diode with nominal breakdown voltage of 15 V at 5 mA test current, 50 Ω typical differential resistance, and 9.2 mV/K temperature coefficient. It operates as a low-power voltage reference in bias networks, overvoltage clamping circuits, and precision analog signal conditioning stages within industrial sensor interfaces and power supply feedback loops.

For engineers reviewing the BZX79-C15,133 datasheet, BZX79-C15,133 pinout, BZX79-C15,133 application, or BZX79-C15,133 equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (380 K/W), non-repetitive peak reverse power (40 W), and DO-35 package compatibility with through-hole PCB assembly.

Technical Context

This device functions as a passive two-terminal voltage reference relying on controlled reverse-biased avalanche and Zener breakdown mechanisms. Its 15 V nominal regulation point falls in the mid-range of the BZX79 series, where temperature coefficient transitions from negative to positive values-here +9.2 mV/K at I_Z = 5 mA-enabling stable operation across −65 °C to +200 °C junction temperatures.

The SOD27 (DO-35) hermetically sealed glass package ensures long-term parameter stability under humidity and thermal cycling stress. With 500 mW total power dissipation at T_amb = 50 °C and 40 W non-repetitive surge capability (100 μs square wave), it supports transient suppression and precision DC referencing without active circuitry.

Key Specifications

Pinout & Package

Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode band marking; lead diameter 0.45 mm, body length 4.25 mm, overall length 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-C15,133, the 1N4744A offers higher power handling but requires larger board real estate, while the BZX79-C13,133 provides identical form-factor compatibility at a lower voltage-making both viable only when voltage target or thermal margin shifts justify the change.

Availability

BZX79-C15,133 is available at Aetrix Electronics and suitable for industrial sensor interfaces, switch-mode power supply feedback networks, microcontroller I/O protection, and low-power analog front-end biasing requiring stable component supply and long-lifecycle support.

Supply support for BZX79-C15,133 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, serving automotive, industrial, computing, consumer, and wearable markets with high-volume, high-reliability components.

The BZX79 series belongs to Nexperia's legacy Zener diode product line, designed specifically for cost-sensitive, low-power voltage regulation and reference applications in general-purpose electronics.

FAQ

What is the maximum continuous power dissipation for BZX79-C15,133 at 50 °C ambient?

The maximum continuous power dissipation is 500 mW when mounted on a standard PCB with leads ≤8 mm and tie-point temperature ≤50 °C. This value drops to 400 mW if the PCB lacks metallization pads, reflecting thermal derating based on JEDEC-compliant test conditions.

How does the temperature coefficient affect regulation accuracy over temperature?

With a +9.2 mV/K coefficient at 5 mA, the Zener voltage increases by approximately 0.92 V over a 100 °C rise. For example, from 25 °C to 125 °C junction temperature, V_Z shifts from 15.0 V to ~15.9 V-critical for applications requiring tight DC accuracy across wide temperature ranges.

Can BZX79-C15,133 be used in surface-mount designs?

No-it is exclusively packaged in the axial-leaded SOD27 (DO-35) glass case, intended for through-hole mounting. Surface-mount alternatives like the BZT52-C15 (SOD-123) exist but differ in thermal performance, surge capability, and leakage characteristics.

What is the significance of the "C" suffix in BZX79-C15,133?

The "C" denotes ±5% tolerance on the nominal Zener voltage (15 V), distinguishing it from the tighter ±2% "B" variant (BZX79-B15). This looser tolerance reduces cost while maintaining sufficient accuracy for non-critical biasing and clamping functions.