Nexperia USA Inc. BZX84-B27,215

Overview

BZX84-B27,215 from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 27 V nominal breakdown voltage at 2 mA, 250 mW total power dissipation, and 150 °C maximum junction temperature - used for precision low-power voltage reference and overvoltage protection in sensor signal conditioning circuits.

For engineers reviewing the BZX84-B27,215 datasheet, BZX84-B27,215 pinout, BZX84-B27,215 application, or BZX84-B27,215 equivalent, key selection criteria include Zener voltage tolerance (±2 %), differential resistance (≤300 Ω at 2 mA), reverse current (≤80 μA at 22.7 V), thermal resistance (330 K/W to solder point), and non-repetitive surge capability (1.0 A peak for 100 μs).

Technical Context

This Zener diode operates in reverse-biased breakdown mode to maintain stable voltage across its terminals under varying load and supply conditions. Its 27 V nominal Zener voltage is specified at I_Z = 2 mA with a temperature coefficient of +0.05 mV/K, indicating minimal drift over temperature.

The device features low dynamic impedance (≤300 Ω), enabling effective regulation in low-current bias networks. It is designed for surface-mount use on FR4 PCBs with single-sided 70 µm copper, and its thermal path prioritizes heat transfer from junction to cathode solder point (R_th(j-sp) = 330 K/W).

Key Specifications

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted package with 3 leads; compact footprint (2.9 mm × 1.3 mm × 1.0 mm) optimized for high-density PCB layouts and reflow/wave soldering per IPC-7095 guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-B27,215, the ON Semiconductor part trades tolerance and thermal performance for broader availability, while the Vishay part offers higher power at the expense of regulation precision and leakage - making the Nexperia device optimal for applications demanding ±2 % stability and low-quiescent design.

Availability

BZX84-B27,215 is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller reset circuits, RS-485 bus protection, and automotive body control module supply monitoring requiring stable component supply and long-term obsolescence management.

Supply support for BZX84-B27,215 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, and efficient devices for automotive, industrial, computing, consumer, and communications markets.

The BZX84 series belongs to Nexperia's precision Zener diode product line, engineered specifically for low-power voltage reference, overvoltage clamping, and bias network stabilization in space-constrained SMT applications.

FAQ

What is the maximum continuous Zener current for BZX84-B27,215 at 70 °C ambient?

At 70 °C ambient, the device's power derating curve reduces maximum continuous current to approximately 125 mA. This is calculated from the 250 mW rating at 25 °C and thermal resistance of 500 K/W (junction-to-ambient), resulting in ~125 mW allowable dissipation at 70 °C - sufficient for 27 V × 4.6 mA operation. Derating follows linear interpolation per IEC 60134 guidelines.

Can BZX84-B27,215 be used in place of a 24 V Zener for overvoltage protection?

No - BZX84-B27,215 is specified for 27 V nominal breakdown at 2 mA, with a minimum V_Z of 26.5 V. Using it as a 24 V clamp would result in premature conduction above 26.5 V, failing to protect downstream 24 V-rated ICs. For 24 V protection, BZX84-B24,215 (23.5–24.5 V) is the correct variant, confirmed by Table 8 in the datasheet.

Is Pin 2 internally connected or should it be tied to ground?

Pin 2 is explicitly marked "n.c." (not connected) in Table 2 of the datasheet and has no internal bond wire or die connection. It must remain electrically floating - grounding or routing traces to it introduces parasitic capacitance and potential leakage paths that degrade reverse leakage specs and thermal performance. Mechanical anchoring is permissible but must avoid electrical contact.

How does the +0.05 mV/K temperature coefficient affect regulation accuracy over −40 °C to +125 °C?

Over this 165 K range, the coefficient contributes ±8.25 mV total drift (0.05 mV/K × 165 K), or ±0.03 % of 27 V. Combined with ±2 % initial tolerance, worst-case V_Z spans 26.19 V to 27.81 V. This remains within typical 24 V system OVLO/UVLO guardbands (e.g., 23.5–28.5 V), confirming suitability for industrial supply monitoring without active compensation.