Nexperia USA Inc. BZX79-C30,113

Overview

BZX79-C30,113 from Nexperia is a ±5% tolerance Zener voltage regulator diode with nominal breakdown voltage of 30 V at 2 mA test current, 70 Ω typical differential resistance, and −20.6 mV/K temperature coefficient. It operates as a low-power voltage reference in bias networks and analog signal conditioning circuits, rated for 500 mW total power dissipation at 50 °C ambient.

For engineers reviewing the BZX79-C30,113 datasheet, BZX79-C30,113 pinout, BZX79-C30,113 application, or BZX79-C30,113 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 two-terminal shunt voltage regulator, maintaining stable output voltage across a load by conducting reverse current above its specified Zener voltage. Its operation relies on controlled avalanche breakdown in silicon, with voltage regulation defined at I_Ztest = 2 mA per the BZX79-C series specification.

Thermal performance is constrained by junction-to-ambient thermal resistance of 380 K/W under standard mounting conditions (unmetallized PCB, 8 mm lead length), limiting continuous power handling to 400 mW at 50 °C ambient and 500 mW at lower temperatures. The −20.6 mV/K temperature coefficient indicates decreasing Zener voltage with rising junction temperature.

Key Specifications

Pinout & Package

Hermetically sealed glass SOD27 (DO-35) axial-leaded package with cathode indicated by a colored band. Leads are tinned copper-clad steel, suitable for wave or hand soldering. Package dimensions: D = 4.25 mm max, L = 25.4 mm min, b = 0.56 mm max, G1 = 1.85 mm max.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX79-C30,113, the 1N4745A offers double the power rating in a larger DO-41 package, while BZX85C30 trades tighter thermal design for higher surge robustness-both require layout changes and exhibit higher dynamic impedance than the BZX79-C30's 70 Ω typical r_dif.

Availability

BZX79-C30,113 is available at Aetrix Electronics and suitable for industrial sensor interfaces, power supply feedback networks, and microcontroller I/O protection requiring stable component supply and long-lifecycle support.

Supply support for BZX79-C30,113 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, specializing in high-volume, high-reliability components for automotive and industrial markets.

The BZX79 series belongs to Nexperia's voltage regulator diode product line, engineered for cost-sensitive, low-power voltage reference and stabilization in consumer, computing, and industrial electronics.

FAQ

What is the maximum continuous reverse current this diode can handle at 30 V?

The BZX79-C30,113 does not specify a maximum continuous reverse current independent of power dissipation. At 30 V, continuous operation is limited by P_tot = 500 mW, yielding a theoretical max I_Z of 16.7 mA at 50 °C ambient. Derating applies above that temperature per the 380 K/W thermal resistance.

Can this Zener diode be used in surface-mount designs?

No - the BZX79-C30,113 uses a through-hole DO-35 (SOD27) glass package with axial leads and is not compatible with SMT reflow or pick-and-place processes. For surface-mount equivalents, consider Nexperia's BZX384-C30 (SOD-323) or PZM30xx series.

How does the −20.6 mV/K temperature coefficient affect circuit accuracy?

A −20.6 mV/K coefficient means the Zener voltage decreases by ~0.62 V over a 30 K (−25 °C to +70 °C) operating range. In precision references, this drift must be compensated via circuit topology or calibration; it is acceptable for non-critical biasing where ±2% overall variation is tolerable.

Is the cathode marking polarity consistent across all BZX79-C variants?

Yes - all BZX79-C series diodes, including BZX79-C30,113, use a single colored band (typically black or dark gray) on the glass body to identify the cathode terminal, matching industry-standard DO-35 marking convention and ensuring correct orientation during manual or automated assembly.