Nexperia USA Inc. BZT52H-B43,115

Overview

BZT52H-B43,115 from Nexperia is a ±2 % tolerance Zener diode in SOD123F package, rated for 43 V nominal breakdown voltage at I_Z = 2 mA, with 830 mW total power dissipation and 325 Ω maximum differential resistance - used for precision voltage reference and overvoltage protection in low-power analog supply rails.

For engineers reviewing the BZT52H-B43,115 datasheet, BZT52H-B43,115 pinout, BZT52H-B43,115 application, or BZT52H-B43,115 equivalent, this part supports stable regulation in space-constrained PCBs where thermal resistance to solder point (150 K/W) and low reverse leakage (<1 μA at 34.4 V) are critical selection criteria.

Technical Context

This Zener diode operates in reverse-bias breakdown mode with a temperature coefficient of +0.05 mV/K at I_Z = 2 mA, indicating near-zero drift across temperature. Its 43 V nominal Zener voltage is specified under standardized test conditions (T_j = 25 °C, pulse width ≤ 300 μs), ensuring repeatability in production calibration circuits.

The device exhibits 325 Ω differential resistance at I_Z = 2 mA, confirming tight regulation performance suitable for feedback references in LDOs or ADC reference buffers. Its non-repetitive peak reverse current rating is 0.6 A (t_p = 100 μs), enabling transient surge suppression in low-energy signal paths.

Key Specifications

Pinout & Package

SOD123F surface-mount plastic package: 2.5–2.7 mm length × 1.5–1.7 mm width × 0.9–1.1 mm height; flat lead profile optimized for reflow soldering on FR4 PCBs with standard footprint per Figure 12.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZT52C43,115 and MMSZ43ET1G, the BZT52H-B43,115 delivers tighter tolerance and lower leakage for high-accuracy reference duties, while maintaining identical SOD123F mounting - making it optimal for new designs prioritizing long-term stability over marginal BOM cost reduction.

Availability

BZT52H-B43,115 is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable instrumentation power rails, and embedded system overvoltage protection requiring stable component supply and guaranteed parametric compliance.

Supply support for BZT52H-B43,115 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with manufacturing rooted in process control and automotive-grade quality systems.

The BZT52H series belongs to Nexperia's general-purpose Zener diode product line, engineered specifically for space-efficient, thermally robust voltage regulation in consumer, industrial, and computing applications where SMD scalability and parametric consistency are essential.

FAQ

What is the maximum continuous reverse current the BZT52H-B43,115 can sustain without exceeding its 830 mW power limit?

At 43 V Zener voltage, the absolute maximum continuous reverse current is 19.3 mA (830 mW ÷ 43 V), assuming T_amb ≤ 25 °C and proper PCB thermal pad layout. Derating is required above 25 °C ambient - e.g., at 70 °C, max I_Z drops to ~13.5 mA based on 150 K/W R_th(j-sp).

How does the ±2 % tolerance of BZT52H-B43,115 impact its use in a 12-bit ADC reference circuit?

A ±2 % tolerance on 43 V yields a ±0.86 V uncertainty, translating to ±35 LSB error in a 43 V full-scale 12-bit ADC (1 LSB = 10.5 mV). For sub-LSB accuracy, external trimming or a higher-precision reference is needed - but the tight tolerance still eliminates initial calibration steps in many industrial sensor interfaces.

Can BZT52H-B43,115 be used in bidirectional ESD protection configurations?

Yes - when paired with a series silicon diode (e.g., BAS16), the BZT52H-B43,115 forms a low-capacitance (40 pF), low-leakage bidirectional clamp. Its 0.9 V forward drop and 43 V reverse breakdown provide symmetrical protection for data lines operating up to ±36 V, meeting IEC 61000-4-2 Level 3 requirements.

Is the SOD123F package of BZT52H-B43,115 compatible with standard reflow profiles for lead-free assembly?

Yes - Nexperia specifies reflow soldering as the only recommended method, with peak temperature up to 260 °C for ≤ 30 seconds. The SOD123F outline (Figure 11) and solder land pattern (Figure 12) are fully aligned with IPC-7351B Class B standards, supporting automated placement and Type 3 solder paste printing.