Nexperia USA Inc. BZX79-C15,143

Overview

BZX79-C15,143 from Nexperia is a ±5% tolerance Zener voltage regulator diode in a hermetically sealed SOD27 (DO-35) glass package, rated for 15 V nominal working voltage at 5 mA test current, 500 mW total power dissipation at 50 °C ambient, and 75 nA reverse leakage at 10.5 V (0.7 × V_Znom). It serves as a low-power voltage reference in linear power supply feedback paths and analog sensor biasing circuits.

For engineers reviewing the BZX79-C15,143 datasheet, BZX79-C15,143 pinout, BZX79-C15,143 application, or BZX79-C15,143 equivalent, key selection criteria include Zener voltage tolerance, differential resistance (≤200 Ω), temperature coefficient (+9.2 to +13.0 mV/K), non-repetitive surge capability (2.0 A peak reverse current), and DO-35 thermal resistance (380 K/W).

Technical Context

This device operates as a two-terminal shunt voltage regulator, maintaining stable output by conducting reverse current above its specified Zener breakdown voltage. Its E24-series 15 V rating targets mid-range reference needs where ±5% tolerance is acceptable for cost-sensitive industrial and consumer designs.

The SOD27 package enables axial through-hole mounting with cathode band marking, and its hermetic glass construction ensures long-term stability under thermal cycling. Junction-to-ambient thermal resistance (380 K/W) and tie-point resistance (300 K/W) define safe continuous and pulsed power handling per IEC 60134 limiting values.

Key Specifications

Pinout & Package

Two-terminal axial-leaded SOD27 (DO-35) glass package with cathode identified by a colored band. No internal die bonding wires or multi-pin structure - terminals are anode and cathode only.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX79-B15,113, the BZX79-C15,143 trades voltage precision for lower unit cost and same form factor; versus 1N4744A, it offers smaller DO-35 footprint and lower thermal resistance per watt but reduced surge energy handling.

Availability

BZX79-C15,143 is available at Aetrix Electronics and suitable for industrial sensor biasing, linear power supply feedback, overvoltage clamp protection, and microcontroller reset circuitry requiring stable component supply and long-lifecycle support.

Supply support for BZX79-C15,143 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, automotive-qualified components.

The BZX79 series belongs to Nexperia's voltage regulator diode product line, engineered for cost-effective, reliable DC voltage referencing in consumer, industrial, and computing applications where ±5% tolerance meets system requirements.

FAQ

What is the maximum continuous power dissipation for BZX79-C15,143 at 70 °C ambient?

The datasheet specifies 500 mW at 50 °C ambient and 400 mW at 50 °C with note 1 (no metallization pad). At 70 °C, derating applies: using R_{th j-a} = 380 K/W, maximum P_tot = (150 °C − 70 °C) / 380 K/W ≈ 210 mW. This ensures junction temperature stays within −65 to +200 °C limits.

Does BZX79-C15,143 have a specified Zener impedance at 1 kHz?

No - the datasheet provides differential resistance (r_dif) at DC test currents (5 mA), ranging 50–200 Ω. Zener impedance is not characterized at AC frequencies; for dynamic applications, use r_dif as worst-case small-signal resistance, and verify stability with actual load capacitance and source impedance.

Can BZX79-C15,143 be used in place of BZX79-C12,113 in a 12 V reference design?

No - the 15 V nominal Zener voltage differs significantly from 12 V. Substituting would shift regulation point by +3 V, likely causing overvoltage damage to downstream 12 V-rated components. Always match nominal V_Z within ±0.5 V for functional equivalence in feedback or bias roles.

Is the cathode band orientation consistent across all SOD27-packaged BZX79-C devices?

Yes - per Nexperia's package outline (SOD27), the colored band always marks the cathode terminal, regardless of Zener voltage value. This is standardized across the entire BZX79-C series and verified in Figure 1 of the datasheet, ensuring correct polarity during manual or automated placement.