Nexperia USA Inc. BZX79-C9V1,143

Overview

BZX79-C9V1,143 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 stabilization at 5 mA test current, with 40–100 Ω differential resistance, 3.8–7.0 mV/K temperature coefficient, and 150 pF capacitance at 1 MHz. It delivers stable low-voltage reference in power supply feedback loops and analog sensor biasing circuits.

For engineers reviewing the BZX79-C9V1,143 datasheet, BZX79-C9V1,143 pinout, BZX79-C9V1,143 application, or BZX79-C9V1,143 equivalent, this page provides verified electrical parameters, thermal behavior, package dimensions, real-world use cases, and validated alternative parts for voltage reference design and board-level stabilization.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable DC voltage across its terminals under varying load and input conditions. Its 9.1 V nominal Zener voltage is specified at I_Ztest = 5 mA, with differential resistance of 40–100 Ω ensuring predictable regulation slope and low dynamic impedance.

The device exhibits a positive temperature coefficient of +3.8 to +7.0 mV/K at 5 mA, making it suitable for temperature-compensated references when paired with negative-coefficient devices. Its 150 pF junction capacitance at 0 V bias supports stable operation up to mid-frequency analog signal paths without introducing phase shift.

Key Specifications

Pinout & Package

Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode indicated by a colored band. Dimensions: D = 4.25 mm max., L = 25.4 mm min., b = 0.56 mm max., G1 = 1.85 mm max. Lead spacing accommodates standard through-hole PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX79-B9V1,113, the BZX79-C9V1,143 trades precision for cost and robustness in harsh environments; versus 1N4739A, it offers superior moisture resistance and tighter thermal performance due to glass encapsulation and defined tie-point thermal resistance.

Availability

BZX79-C9V1,143 is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, and embedded reset circuits requiring stable component supply and long-lifecycle support.

Supply support for BZX79-C9V1,143 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, logic, and PowerMOS semiconductors, serving automotive, industrial, computing, and consumer markets with high-reliability components.

This part belongs to the BZX79 series of low-power Zener diodes designed specifically for voltage regulation and reference applications in space-constrained, thermally demanding PCB layouts.

FAQ

What is the maximum continuous power dissipation for BZX79-C9V1,143 at 50 °C ambient?

The maximum continuous power dissipation is 500 mW when mounted on a PCB without metallization pad and with lead length ≤8 mm at T_amb = 50 °C. Derating is required above this temperature at 3.3 mW/°C based on R_{th j-a} = 380 K/W.

How does the temperature coefficient affect voltage stability in a 0–70 °C operating range?

With a typical temperature coefficient of +5.5 mV/K, the BZX79-C9V1,143 exhibits ~385 mV total drift across 70 °C - approximately ±2.1% of nominal 9.1 V. This is acceptable for non-critical references but requires compensation in precision systems.

Can BZX79-C9V1,143 be used in place of BZX79-B9V1,113 without circuit modification?

No - while both share identical nominal voltage and package, the ±5% tolerance of the C-series introduces up to ±0.455 V variation versus ±0.182 V for the B-series. Feedback loop gain and stability margins must be re-evaluated if substituting.

What is the significance of the "143" suffix in the full part number?

The "143" is Nexperia's internal ordering code denoting tape-and-reel packaging (12 mm tape, 3000 pcs/reel), RoHS compliance, and standard quality grade. It does not affect electrical characteristics or package dimensions.