Nexperia USA Inc. BZX79-B75,113

Overview

BZX79-B75,113 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal 75 V breakdown voltage at 2 mA test current, 170 Ω typical differential resistance, and −5.3 mV/K temperature coefficient at 2 mA. It operates within −65 °C to +200 °C junction temperature range and delivers stable reference voltage in low-power analog circuits, such as precision power supply feedback loops and sensor biasing networks.

For engineers reviewing the BZX79-B75,113 datasheet, BZX79-B75,113 pinout, BZX79-B75,113 application, or BZX79-B75,113 equivalent, this part serves as a hermetically sealed, axial-leaded, glass-encapsulated voltage reference for designs requiring tight tolerance, low leakage (<50 nA at 0.7×V_Znom), and robust thermal performance in compact through-hole layouts.

Technical Context

This Zener diode functions in reverse-biased avalanche mode to maintain a stable DC reference voltage across its terminals under varying load and temperature conditions. Its 75 V nominal Zener voltage is specified at I_Ztest = 2 mA, with differential resistance of 170 Ω (typ.) and 500 Ω (max.), ensuring predictable regulation slope and minimal output drift during current variation.

The device exhibits a negative temperature coefficient of −5.3 mV/K (typ.) at 2 mA, enabling predictable thermal drift compensation when paired with positive-TC components. With 35 nA max reverse leakage at VR = 0.7×V_Znom, it supports low-current reference nodes while maintaining stability up to 200 °C junction temperature.

Key Specifications

Pinout & Package

Hermetically sealed glass SOD27 (DO-35) package with axial leads; cathode identified by a black band on the glass body. Lead spacing is not standardized but conforms to JEDEC DO-35 mechanical outline A24.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX79-B75,113, the BZT03-C75 offers higher power handling but sacrifices tolerance and package size, while the BZX55C75 matches the DO-35 form factor but degrades regulation accuracy and dynamic response due to looser tolerance and higher differential resistance.

Availability

BZX79-B75,113 is available at Aetrix Electronics and suitable for industrial power supply feedback, automotive sensor biasing, test equipment voltage calibration, and legacy telecom line interface applications requiring stable component supply and long-lifecycle support.

Supply support for BZX79-B75,113 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, serving automotive, industrial, computing, consumer, and wearable markets with high-volume, high-reliability components.

The BZX79 series belongs to Nexperia's legacy Zener diode portfolio designed specifically for precision voltage reference and low-power stabilization in cost-sensitive, space-constrained through-hole applications.

FAQ

What is the maximum continuous reverse current this diode can handle at 75 V?

The BZX79-B75,113 is not rated for continuous reverse current at full Zener voltage. Its maximum continuous power dissipation is 500 mW at 50 °C ambient, limiting sustained reverse current to approximately 6.7 mA (500 mW ÷ 75 V). Exceeding this risks thermal runaway and permanent damage.

Can this diode be used in surface-mount designs?

No - the BZX79-B75,113 uses an axial-leaded SOD27 (DO-35) glass package intended exclusively for through-hole mounting. It lacks solder pads or terminations compatible with reflow or wave soldering processes. For SMT equivalents, consider Nexperia's PZM series or BZX84-C75 in SOT-23.

How does the −5.3 mV/K temperature coefficient impact circuit performance?

This negative coefficient means the Zener voltage decreases by ~5.3 mV per °C rise in junction temperature. In a 75 V reference, that equates to ~0.007% per °C drift. Designers must account for this in high-temperature environments or pair it with complementary positive-TC components to achieve net-zero drift.

Is the cathode marking visible on the physical device?

Yes - the cathode is clearly marked by a single black band on the glass body of the SOD27 package. This band aligns with the cathode terminal and must be oriented toward the higher-potential node in Zener regulation configurations.