NXP Semiconductors BZX284-B3V9,115

Overview

BZX284-B3V9,115 from NXP Semiconductors is a ±2% tolerance Zener voltage regulator diode in a SOD110 ceramic SMD package, rated for 3.82–3.98 V nominal Zener voltage at 5 mA test current, 400 mW total power dissipation, and 400 Ω max differential resistance - used for precision low-power voltage reference and overvoltage protection in sensor signal conditioning circuits.

For engineers reviewing the BZX284-B3V9,115 datasheet, BZX284-B3V9,115 pinout, BZX284-B3V9,115 application, or BZX284-B3V9,115 equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal resistance (315 K/W), reverse leakage (3 μA at 1 V), temperature coefficient (−2.5 mV/K), and SOD110 footprint compatibility with space-constrained PCB layouts.

Technical Context

The BZX284-B3V9,115 operates as a two-terminal silicon Zener diode optimized for stable voltage regulation under reverse bias. Its junction temperature range spans −65 °C to +150 °C, with thermal resistance from junction-to-ambient fixed at 315 K/W when mounted on a standard 11 × 25 × 1.6 mm PCB.

It exhibits a negative temperature coefficient of −2.5 mV/K at 5 mA test current, indicating decreasing Zener voltage with rising temperature - a critical factor in temperature-sensitive analog front-ends. Reverse leakage remains tightly controlled at 3 μA at VR = 1 V, supporting low-quiescent-current designs.

Key Specifications

Pinout & Package

SOD110 is a two-terminal surface-mount ceramic package with cathode marked by a band on one end. Terminals are non-polarized in function but directionally critical: anode connects to lower potential, cathode to regulated output node.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX284-B3V9,115, MMBZ5226BS-7-F trades accuracy for higher test-current stability and larger package, while BZX384-B3V9,115 offers identical voltage specs in a smaller footprint at reduced power and thermal capability - making the original optimal for balanced accuracy, power, and thermal performance in SOD110-constrained designs.

Availability

BZX284-B3V9,115 is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB-C port protection, and low-power wearable battery monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BZX284-B3V9,115 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The BZX284 series was designed specifically for high-reliability, low-power voltage regulation in space-constrained SMD applications - emphasizing tight tolerance, stable temperature behavior, and ceramic-package robustness for mission-critical analog functions.

FAQ

What is the nominal Zener voltage of BZX284-B3V9,115 and how is it tested?

The BZX284-B3V9,115 has a nominal Zener voltage of 3.9 V, specified as 3.82–3.98 V at a test current of 5 mA under T_j = 25 °C conditions. This value is measured in reverse bias with the cathode held positive relative to the anode, and reflects the voltage at which the diode enters controlled breakdown - critical for setting reference points in linear regulators and clamping circuits. The BZX284-B3V9,115 achieves this specification within its ±2% tolerance band.

Does BZX284-B3V9,115 support operation at elevated temperatures?

Yes, BZX284-B3V9,115 is rated for junction temperatures from −65 °C to +150 °C and storage temperatures up to +150 °C. Its ceramic SOD110 package maintains stable electrical characteristics across this full range, with a defined temperature coefficient of −2.5 mV/K at 5 mA. Derating of power dissipation is required above 25 °C ambient per the thermal resistance of 315 K/W - ensuring reliable operation in automotive under-hood or industrial motor-control environments where the BZX284-B3V9,115 is commonly deployed.

How does the reverse leakage current of BZX284-B3V9,115 compare to similar Zeners?

BZX284-B3V9,115 specifies only 3 μA of reverse leakage current at V_R = 1 V, which is significantly lower than many ±5% Zener families (e.g., BZX284-C3V9 specifies 3 μA at same condition, but higher-voltage variants often exceed 10 μA). This low leakage directly supports ultra-low-power design goals - for example, enabling <100 nA additional current draw in battery-monitoring comparators. The BZX284-B3V9,115 achieves this while retaining ±2% tolerance and 400 mW capability, distinguishing it from micro-leakage-optimized but lower-power alternatives.

Can BZX284-B3V9,115 be used in place of BZX284-C3V9,115?

No - BZX284-B3V9,115 and BZX284-C3V9,115 are not interchangeable without circuit review. While both share the same nominal 3.9 V rating, the BZX284-B3V9,115 has ±2% tolerance (3.82–3.98 V), whereas BZX284-C3V9,115 has ±5% (3.7–4.1 V). This 0.38 V wider window affects regulation accuracy in precision references. Additionally, differential resistance differs (400–500 Ω vs. 400–90 Ω), impacting load regulation. The BZX284-B3V9,115 is preferred where tighter voltage control is required; substituting the C-variant may cause functional failure in sensitive analog stages.

What is the maximum non-repetitive peak reverse current for BZX284-B3V9,115?

The BZX284-B3V9,115 supports a maximum non-repetitive peak reverse current (I_ZSM) of 12.0 A for pulse width t_p = 100 μs at T_amb = 25 °C prior to surge. This rating enables the BZX284-B3V9,115 to absorb transient energy from ESD events or inductive switching spikes without degradation - provided the average power remains within the 400 mW limit and thermal mass prevents junction overheating. The value is consistent across all BZX284-B/C types from 2.4 V to 24 V, confirming robust surge capability inherent to the SOD110 ceramic construction.