Nexperia USA Inc. BZX79-C9V1,113

Overview

BZX79-C9V1,113 from Nexperia is a ±5% tolerance Zener voltage regulator diode in a hermetically sealed SOD27 (DO-35) glass package, rated for 9.1 V nominal Zener voltage at 6 V reverse bias with 500 nA maximum reverse current, 40–100 Ω differential resistance at 5 mA test current, and 500 mW total power dissipation at Tamb = 50 °C. It serves as a low-power voltage reference in analog sensor signal conditioning circuits.

For engineers reviewing the BZX79-C9V1,113 datasheet, BZX79-C9V1,113 pinout, BZX79-C9V1,113 application, or BZX79-C9V1,113 equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (380 K/W), non-repetitive peak reverse power (40 W), and cathode-marked axial lead configuration for PCB-level voltage stabilization.

Technical Context

This device operates as a passive two-terminal voltage reference, relying on controlled Zener breakdown in silicon PN junctions. Its regulation behavior is defined by reverse-bias characteristics at IZtest = 5 mA, with temperature coefficient of +3.8 to +7.0 mV/K and differential resistance between 40 Ω (typ.) and 100 Ω (max.) - indicating moderate regulation stiffness under load variation.

The SOD27 package imposes strict thermal limits: junction-to-ambient thermal resistance is 380 K/W with unmetallized PCB mounting and max. 8 mm lead length, requiring careful layout for sustained 400–500 mW dissipation. Non-repetitive surge capability is validated at tp = 100 μs, 40 W peak, with tie-point temperature ≤ 50 °C.

Key Specifications

Pinout & Package

Hermetically sealed axial-lead SOD27 (DO-35) glass package with cathode indicated by a colored band. Leads are tinned copper-clad steel, suitable for wave or hand soldering. Device is unidirectional and polarity-sensitive.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX79-B9V1,113, this part trades ±2% accuracy and lower impedance for lower cost and broader availability; versus 1N4739A, it offers identical voltage spec but reduced power rating and higher thermal resistance - making it optimal for space-constrained, low-power reference nodes rather than high-current regulation.

Availability

BZX79-C9V1,113 is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller reference circuits, and DC-DC feedback networks requiring stable component supply with traceable lot history and RoHS-compliant packaging.

Supply support for BZX79-C9V1,113 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, logic, and PowerMOS semiconductors, spun off from NXP in 2017 and focused on automotive, industrial, computing, and consumer markets.

This device belongs to the BZX79 series of low-power Zener diodes designed for cost-sensitive, space-constrained voltage reference and stabilization in analog and power management circuits.

FAQ

What is the maximum continuous reverse current this diode can handle at 9.1 V?

The BZX79-C9V1,113 is not rated for continuous reverse current at its Zener voltage. Its specified condition is IZtest = 5 mA for parameter characterization. Continuous operation must stay within Ptot = 500 mW limit, meaning max. average reverse current is ~55 mA at 9.1 V - but thermal derating applies above Tamb = 50 °C.

Can this diode be used in place of a 1N4739A in a 9.1 V regulator?

Yes, electrically - both have 9.1 V nominal Zener voltage and ±5% tolerance - but mechanical and thermal differences matter: BZX79-C9V1,113 uses smaller SOD27 (DO-35) package with higher thermal resistance (380 K/W vs. 120 K/W), limiting continuous power to 500 mW versus 1.2 W. Layout and heat sinking must be re-evaluated.

Does the cathode band indicate polarity during forward or reverse bias operation?

The cathode band marks the P-type semiconductor side and must be connected toward the more positive potential in Zener (reverse-bias) operation. In forward bias, it conducts like a standard diode with VF ≈ 0.9 V at 10 mA - but forward conduction is not its intended function.

How does temperature affect the 9.1 V Zener voltage in practical circuits?

At IZ = 5 mA, the temperature coefficient is +3.8 to +7.0 mV/K, meaning voltage increases ~0.5–0.9 V over a 125 °C range (−40 to +85 °C). For stable references, pair with negative-TC components or use temperature-compensated topologies like dual-Zener configurations.