Nexperia USA Inc. BZX79-C27,113

BZX79-C27,113 Overview by Nexperia

The BZX79-C27,113 from Nexperia is a 27 V Zener diode designed for voltage regulation and reference roles in a broad range of analog and mixed-signal circuits. Encapsulated in a hermetically sealed glass axial package (SOD27/DO-35), this device offers 400 mW power handling with ±5% voltage tolerance. The BZX79-C27,113 sits within the well-established BZX79 series, which includes options with working voltages across the 2.4–75 V range, making it suitable for legacy designs, upgrades, and new developments where discrete voltage reference or clamping is required.

Important Attributes of the BZX79-C27,113 Zener Diode

The BZX79-C27,113 combines robust low-power regulation with package reliability and flexibility. Notable highlights include:

Nominal Zener voltage: 27 V

Maximum power dissipation: 400 mW (with a series maximum of 500 mW under optimal conditions)

Tolerance class: ±5%, part of the “C” subset in BZX79 (±2% “B” versions also available in series)

Non-repetitive peak reverse power dissipation: up to 40 W—providing resilience during voltage transients

Glass package with axial leads for through-hole assembly, ensuring high integrity and mechanical robustness

These features are tailored for use cases where tight voltage regulation is essential but thermal and electrical stress cycles may occur.

Electrical Specifications of BZX79-C27,113

For circuit designers, the electrical properties of the BZX79-C27,113 are characterized at a device junction temperature of 25°C unless otherwise specified. The standardized working voltage and tolerance ensure predictable clamping or reference voltages in regulated power supplies, signal conditioning paths, and protection circuits. With a specified power rating of 400 mW, this diode effectively handles typical shunt regulator and voltage reference applications without excessive derating.

In practice, current versus voltage characteristics of the BZX79-C27,113 define Zener breakdown behavior, and the diode’s temperature coefficient—particularly as a function of working current—enables designers to estimate parameter drift across an extended temperature range, an especially relevant factor in precision analog blocks.

Thermal and Structural Properties of BZX79-C27,113

Proper thermal management is a priority in any voltage reference diode selection. For the BZX79-C27,113, thermal resistance from junction to ambient is influenced by pulse duration and the mounting method (notably, the data assumes PCB mounting without a metallization pad). The device can sustain short surges (non-repetitive) up to 40 W, protecting downstream circuitry during power-on or fault events.

Mechanically, the SOD27 (DO-35) glass package offers high reliability under thermal excursions and is equipped with an axial lead design to facilitate through-hole mounting and rapid prototyping. The package code and clear cathode marking support seamless installation and automated inspection in production settings.

Use Cases for BZX79-C27,113

The BZX79-C27,113 Zener diode demonstrates outstanding utility in applications such as:

Low-voltage stabilization modules

Precision voltage references for analog-digital interfaces

Overvoltage and surge protection in industrial and consumer systems

Shunt regulators in signal processing and sensor front-ends

Its 27 V reference voltage specifically suits cases where supply rails or analog zones require a tightly regulated voltage below standard line potentials, such as post-regulation in multi-stage power designs or as a precision clamp around sensitive microprocessor or analog signal paths.

Design Notes for BZX79-C27,113

Selecting and applying the BZX79-C27,113 in a design requires attention to thermal limits, mounting practice, and expected operational environment. Engineers should ensure:

The average power dissipation remains below the 400 mW rating (derate at higher ambient).

Thermal design accounts for PCB layout and airflow (open vs. enclosed environments).

Non-repetitive surges do not exceed 40 W; suitable series/parallel coordination is used for worst-case transients.

Tolerance ±5% is compatible with overall system accuracy or, where needed, the ±2% “B” tolerance type from the same family is considered.

Additional attention should be paid to the temperature coefficient of Zener voltage, as this affects long-term precision in reference applications, particularly for designs exposed to wide temperature swings.

Possible Alternative/Substitute Models for BZX79-C27,113

Engineers seeking drop-in compatible or equivalent devices to the BZX79-C27,113 should refer to other BZX79 series diodes by Nexperia with similar voltage and power ratings. Additionally, equivalent devices in the industry-standard DO-35 glass package with a 27 V Zener voltage and comparable power ratings from major manufacturers may be considered, pending detailed verification of tolerance, voltage stability, and temperature coefficient. Always verify that form factor, electrical characteristics, and qualification standards meet project requirements before substitution.

Conclusion

The BZX79-C27,113 from Nexperia offers an exemplary combination of established reliability, precise Zener voltage regulation, and manufacturability in both legacy and modern applications. Its robust specifications and flexibility within the BZX79 series make it a favored component for engineers seeking dependable performance in voltage reference and clamping roles. By considering the outlined thermal, electrical, and integration factors—and referencing equivalent/replacement options where necessary—designers and procurement specialists can confidently specify the BZX79-C27,113 for regulated power and protection circuits across a diverse range of electronic systems.