Nexperia USA Inc. BZX84-C30,235

Overview

BZX84-C30,235 from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 30 V nominal breakdown voltage at 2 mA, 250 mW total power dissipation, and 40 W non-repetitive peak reverse power. It serves as a precision reference or overvoltage clamp in low-power analog supply rails and sensor bias networks.

For engineers reviewing the BZX84-C30,235 datasheet, BZX84-C30,235 pinout, BZX84-C30,235 application, or BZX84-C30,235 equivalent, key selection factors include its 30 V Zener voltage tolerance band (28.0–32.0 V), differential resistance of ≤300 Ω at 2 mA, temperature coefficient of +0.05 mV/K, and thermal resistance of 330 K/W to solder point - critical for stable regulation under ambient drift or transient load conditions.

Technical Context

This Zener diode operates in reverse-biased avalanche mode to maintain a stable reference voltage across its cathode-anode terminals. Its regulation accuracy depends on controlled test current (IZ = 2 mA), junction temperature (Tj ≤ 150 °C), and PCB thermal management via the cathode solder point.

The device exhibits a positive temperature coefficient (+0.05 mV/K) at IZ = 2 mA, indicating minimal voltage drift with rising temperature - a key advantage over lower-voltage Zeners with negative coefficients. Its 300 Ω max differential resistance ensures predictable dynamic impedance during small-signal regulation.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5260BLT1G, BZX84-C30,235 offers lower test-current dependency and better thermal coupling via SOT23 cathode tab; versus BZX84-C30-TP, it trades slightly higher leakage for broader distributor availability and proven field reliability in industrial controls.

Availability

BZX84-C30,235 is available at Aetrix Electronics and suitable for industrial sensor interfaces, embedded power supply monitoring, and overvoltage protection circuits requiring stable component supply and consistent ±5 % Zener tolerance.

Supply support for BZX84-C30,235 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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, miniaturization, and manufacturability.

The BZX84 series targets cost-sensitive, space-constrained applications needing dependable low-power voltage regulation - designed for broad compatibility with automated SMT assembly and long-term stability in commercial-grade environments.

FAQ

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

The BZX84-C30,235 has a maximum continuous forward current (IF) of 200 mA, but as a Zener regulator, it operates in reverse bias. Its steady-state reverse current is determined by external circuit design - typically limited to ≤2 mA for optimal regulation. Exceeding 2 mA increases self-heating and reduces voltage accuracy due to thermal coefficient effects.

Can this part replace a BZX84-B30 in an existing design?

Yes, but with trade-offs: BZX84-C30 has ±5 % tolerance (28.0–32.0 V) versus BZX84-B30's ±2 % (29.4–30.6 V). If the original design relies on tight voltage matching for ADC reference or comparator thresholds, recalibration or tolerance analysis is required. Thermal performance and pinout are identical.

Is the "n.c." pin electrically isolated or internally bonded?

Pin 2 is a non-connected internal lead frame stub - physically present but not electrically tied to any die structure. It must remain unconnected on the PCB. No current path exists between pin 2 and pins 1 or 3; routing traces or soldering to it risks mechanical stress or shorting during assembly.

How does ambient temperature affect its Zener voltage stability?

At IZ = 2 mA, the BZX84-C30,235 has a temperature coefficient of +0.05 mV/K - meaning voltage increases ~0.5 V over a 100 K rise (e.g., −40 °C to +60 °C). This minimal drift makes it suitable for non-critical references where ±1 % total variation is acceptable across industrial temperature ranges.