Nexperia USA Inc. BZX79-C24,133

Overview

BZX79-C24,133 from Nexperia is a ±5% tolerance Zener voltage regulator diode rated at 24 V nominal working voltage (22.8–25.6 V), with 500 mW total power dissipation at T_amb = 50 °C, 60–250 Ω differential resistance at I_Z = 5 mA, and 1.25 A non-repetitive peak reverse current (t_p = 100 μs). It serves as a low-power voltage reference in analog power supply feedback loops and sensor biasing circuits.

For engineers reviewing the BZX79-C24,133 datasheet, BZX79-C24,133 pinout, BZX79-C24,133 application, or BZX79-C24,133 equivalent, key selection criteria include Zener voltage tolerance, dynamic impedance at test current, temperature coefficient (15.9–22.0 mV/K), junction-to-ambient thermal resistance (380 K/W), and DO-35 package compatibility with through-hole PCB layouts.

Technical Context

This device operates in reverse breakdown mode with a specified Zener voltage of 24 V at I_Ztest = 5 mA, exhibiting a typical temperature coefficient of +19.6 mV/K - indicating positive drift with rising junction temperature. Its differential resistance (60–250 Ω) reflects moderate regulation stiffness under varying load currents.

The SOD27 (DO-35) hermetically sealed glass package enables stable long-term voltage reference performance in ambient temperatures from −65 °C to +200 °C, while its 380 K/W junction-to-ambient thermal resistance requires careful PCB layout for sustained 500 mW operation without exceeding T_j = 200 °C.

Key Specifications

Pinout & Package

Hermetically sealed glass SOD27 (DO-35) package with axial leads; cathode identified by a single black 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-B24,133, this part trades initial accuracy for cost and availability; versus 1N4749A, it offers smaller footprint and lower thermal mass but reduced power margin and higher impedance - critical for low-current, space-constrained analog references.

Availability

BZX79-C24,133 is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor interfaces, consumer overvoltage clamps, and medical instrument references requiring stable component supply across multi-year production cycles.

Supply support for BZX79-C24,133 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 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 referencing and clamping in space-constrained through-hole applications.

FAQ

What is the maximum continuous Zener current for BZX79-C24,133 at 25 °C ambient?

The device has no explicit I_Zmax rating, but continuous operation is limited by power dissipation: at 25 °C ambient, P_tot = 500 mW implies I_Z ≤ 20.8 mA (500 mW ÷ 24 V). Derating applies above 50 °C ambient per R_{th j-a} = 380 K/W.

Can BZX79-C24,133 be used in surface-mount designs?

No - it uses the axial-leaded SOD27 (DO-35) glass package designed exclusively for through-hole mounting. For SMT equivalents, consider Nexperia's PZMxx series or ON Semiconductor's MMBZ52xxL family in SOD-123.

How does the temperature coefficient affect long-term reference stability?

With S_Z = +19.6 mV/K, a 50 °C junction rise increases V_Z by ~0.98 V - a 4.1% shift. Stable operation requires thermal management (e.g., minimal copper pour, airflow) or system-level compensation in precision applications.

Is the cathode marking consistent across all BZX79-C24,133 units?

Yes - per Nexperia's SOD27 package specification, a single black band on the glass body always denotes the cathode terminal, verified across manufacturing lots and confirmed in the 2002 datasheet outline diagram.