Nexperia USA Inc. BZX84-C75,235

Overview

BZX84-C75,235 from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 75 V nominal breakdown voltage at I_Z = 2 mA, with 250 mW total power dissipation and 500 Ω maximum differential resistance. It operates across −55 °C to +150 °C ambient and serves as a precision reference or overvoltage clamp in low-power analog supply rails.

For engineers reviewing the BZX84-C75,235 datasheet, BZX84-C75,235 pinout, BZX84-C75,235 application, or BZX84-C75,235 equivalent, key selection criteria include its 75 V Zener voltage tolerance band (70–79 V), non-repetitive peak reverse power capability of 40 W, thermal resistance of 500 K/W (junction-to-ambient), and cathode-anode polarity confirmation for PCB layout verification.

Technical Context

This device functions as a two-terminal passive voltage reference, relying on controlled avalanche breakdown in silicon PN junction under reverse bias. Its regulation behavior is defined by Zener voltage (V_Z = 75 V), dynamic impedance (r_dif ≤ 500 Ω), and temperature coefficient (+0.05 mV/K) - all measured at I_Z = 2 mA.

It exhibits no active control logic or internal compensation; performance depends entirely on external current limiting and thermal management. Reverse leakage remains below 0.2 μA at VR = 57 V, and forward voltage is ≤ 0.9 V at IF = 10 mA, confirming standard silicon diode conduction characteristics.

Key Specifications

Pinout & Package

Package: SOT23 (TO-236AB), surface-mount plastic package with 3 leads; dimensions 2.9 × 1.3 × 1.0 mm (L × W × H); standard footprint per Figure 12 (reflow) and Figure 13 (wave).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C75,235, the MMBZ5270BLT1G trades regulation precision for higher power headroom, while the BZX84-C75-E3-08 matches all electrical and thermal parameters exactly - making it a true form-fit-function alternative with packaging-level differentiation only.

Availability

BZX84-C75,235 is available at Aetrix Electronics and suitable for industrial power supplies, telecom voltage supervisors, and automotive-grade non-safety-critical instrumentation requiring stable component supply and long-term obsolescence management.

Supply support for BZX84-C75,235 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 semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with manufacturing rooted in process technology leadership and automotive-grade quality systems.

The BZX84 series belongs to Nexperia's general-purpose Zener diode product line, engineered for cost-sensitive, space-constrained applications demanding stable voltage reference or clamping across consumer, industrial, and communications equipment.

FAQ

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

The BZX84-C75,235 does not specify a maximum continuous reverse current at 75 V; instead, its safe operating area is defined by total power dissipation (250 mW at 25 °C ambient). At 75 V, this corresponds to ~3.3 mA continuous Zener current - exceeding this requires thermal derating per the 500 K/W junction-to-ambient resistance.

Can this part replace a BZX84-B75 in an existing design?

Yes, but with reduced voltage accuracy: BZX84-C75 has ±5 % tolerance (70–79 V), whereas BZX84-B75 offers ±2 % (73.5–76.5 V). If the application relies on tight regulation or low dynamic impedance, verify that 500 Ω r_dif and wider V_Z spread meet system requirements before substitution.

Is Pin 2 truly unused, or does it serve a mechanical function?

Pin 2 is electrically not connected (n.c.) per Table 2 and must remain unconnected in layout. It serves only as a mechanical lead for package integrity and alignment during SMT placement - no trace, pad, or solder should contact it, as doing so risks shorting or mechanical stress.

How does temperature affect the 75 V Zener voltage in practical use?

At I_Z = 2 mA, the temperature coefficient is +0.05 mV/K - meaning V_Z increases by ~0.5 V over a 100 °C rise (e.g., from 25 °C to 125 °C). This small positive drift improves stability in high-temp environments compared to lower-voltage Zeners with negative coefficients.