Nexperia USA Inc. BZX79-C10,113

Overview

BZX79-C10,113 from Nexperia is a ±5% tolerance Zener voltage regulator diode with nominal 10 V breakdown voltage at 5 mA test current, 50–150 Ω differential resistance, and 200 nA reverse leakage at 7 V. It operates in hermetically sealed SOD27 (DO-35) glass package, rated for 500 mW total power dissipation at 50 °C ambient, and serves as a low-power voltage reference in analog signal conditioning and power supply feedback networks.

For engineers reviewing the BZX79-C10,113 datasheet, BZX79-C10,113 pinout, BZX79-C10,113 application, or BZX79-C10,113 equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (380 K/W), non-repetitive surge capability (90 A peak reverse current), and cathode-marked axial lead configuration - all critical for precision biasing and overvoltage protection in space-constrained PCB designs.

Technical Context

This discrete Zener diode functions exclusively in reverse-biased breakdown mode, delivering stable 10 V regulation under DC or low-frequency transient conditions. Its 50–150 Ω dynamic impedance ensures predictable voltage deviation across 1–10 mA operating range, while the −65 to +200 °C junction temperature rating supports industrial ambient operation.

The device relies on silicon PN-junction physics with no internal pass elements or active circuitry. Its temperature coefficient of +4.5 to +8.0 mV/K (at I_Z = 5 mA) indicates positive drift behavior above ~6 V, requiring thermal compensation in high-stability references - a characteristic confirmed by Fig.6 in the original datasheet.

Key Specifications

Pinout & Package

Hermetically sealed SOD27 (DO-35) glass package with axial leads: 4.25 mm body length, 1.85 mm max diameter, 25.4 mm min lead length. Cathode identified by black band near one end.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4740A and BZX55C10, BZX79-C10,113 offers optimal balance of DO-35 form factor, 500 mW rating, and 50–150 Ω dynamic impedance - making it preferred for space-limited, medium-precision analog references where thermal management is constrained.

Availability

BZX79-C10,113 is available at Aetrix Electronics and suitable for power supply feedback references, low-power sensor biasing, overvoltage clamp protection, and microcontroller reset threshold circuits requiring stable component supply and long-term obsolescence resilience.

Supply support for BZX79-C10,113 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, with focus on automotive, industrial, computing, and consumer markets.

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

FAQ

What is the maximum continuous reverse voltage this diode can regulate at?

The BZX79-C10,113 is specified for stable Zener operation at its nominal 10 V breakdown voltage, with guaranteed regulation between 9.80 V and 10.20 V at 5 mA test current. It must not be operated continuously above its absolute maximum reverse voltage of 7 V (per IR test condition), as sustained bias beyond this risks thermal runaway due to its 380 K/W thermal resistance and 500 mW power limit.

Does this Zener diode have polarity markings, and how is it oriented on PCB?

Yes - the cathode is marked by a distinct black band near one end of the SOD27 glass body. During PCB placement, the banded end connects to the higher-potential node (e.g., supply rail or feedback divider top), while the unmarked (anode) end connects to ground or lower potential. Reversal results in forward conduction (~0.9 V drop) instead of regulation.

Can BZX79-C10,113 replace BZX79-B10 in existing designs?

No - BZX79-C10,113 has ±5% tolerance (9.4–10.6 V), whereas BZX79-B10 has ±2% (9.80–10.20 V). Substituting introduces up to ±3% additional voltage uncertainty, potentially violating tight regulation requirements in feedback loops or precision references. Differential resistance also differs (50–150 Ω vs 40–100 Ω), affecting load regulation performance.

Is this device suitable for high-frequency noise suppression?

No - the BZX79-C10,113 exhibits 15–20 pF junction capacitance at 0 V bias, limiting effective clamping bandwidth to <10 MHz. Its 100 μs surge rating and lack of fast recovery design make it unsuitable for RF filtering or high-speed transient suppression; TVS diodes like P6KE10CA are recommended for such roles.