Nexperia USA Inc. BZT52H-B20,115

Overview

BZT52H-B20,115 from Nexperia is a ±2 % tolerance Zener diode in SOD123F package, rated for 20 V nominal breakdown voltage at 5 mA, 830 mW total power dissipation, and 220 Ω maximum differential resistance - used for precision voltage reference and overvoltage protection in low-power analog supply rails.

For engineers reviewing the BZT52H-B20,115 datasheet, BZT52H-B20,115 pinout, BZT52H-B20,115 application, or BZT52H-B20,115 equivalent, key selection criteria include Zener voltage tolerance (±2 %), thermal resistance (150 K/W junction-to-solder-point), reverse current limit (≤0.05 μA at 15.2 V), and SOD123F footprint compatibility with automated reflow assembly.

Technical Context

This device operates as a two-terminal shunt voltage regulator, maintaining stable output by conducting reverse current above its specified Zener voltage. Its 20 V nominal breakdown is defined at I_Z = 5 mA with ±2 % tolerance, and exhibits a positive temperature coefficient of +14 mV/K at that test condition.

The SOD123F package enables surface-mount integration with low thermal resistance (R_th(j-sp) = 150 K/W) and supports pulsed non-repetitive surge currents up to 1.5 A (100 μs, T_amb = 25 °C), while sustaining continuous operation within 830 mW power limit at T_amb ≤ 25 °C.

Key Specifications

Pinout & Package

SOD123F is a 2-pin surface-mount plastic package with cathode-marked flat lead geometry; dimensions are 3.5 mm × 1.6 mm × 1.1 mm (L × W × H), optimized for high-density PCB layouts and reflow soldering per IPC-7095 guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZT52C20,115 and MMSZ5248B-7-F, BZT52H-B20,115 delivers superior voltage accuracy and thermal performance in the same footprint, making it optimal for precision analog rails where regulation stability outweighs marginal cost differences.

Availability

BZT52H-B20,115 is available at Aetrix Electronics and suitable for power supply reference, overvoltage clamp, and ADC reference buffer applications requiring stable component supply and consistent parametric performance across production lots.

Supply support for BZT52H-B20,115 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 certified to ISO 9001 and IATF 16949 standards.

The BZT52H series belongs to Nexperia's general-purpose Zener diode product line, engineered for robust voltage regulation in consumer, industrial, and computing power systems where compact size and parametric consistency are critical.

FAQ

What is the maximum continuous Zener current for BZT52H-B20,115 at 70 °C ambient?

At T_amb = 70 °C, derated power dissipation is 581 mW (based on 830 mW @ 25 °C and R_th(j-a) = 330 K/W). With V_Z ≈ 20 V, maximum continuous Zener current is 29.05 mA - calculated as P_derated/V_Z. This assumes FR4 PCB mounting with single-sided copper and standard footprint per datasheet condition [3].

Does BZT52H-B20,115 support reflow soldering per JEDEC J-STD-020?

Yes - the SOD123F package is qualified for lead-free reflow per JEDEC J-STD-020D. Peak temperature must not exceed 260 °C for ≤30 seconds, with ramp-up rate ≤3 °C/s and ramp-down rate ≤6 °C/s. Reflow profile must follow Nexperia's recommended thermal profile in section 12 of the datasheet, and wave soldering is not permitted.

How does the temperature coefficient affect regulation accuracy over –40 °C to +125 °C?

At 20 V nominal, the temperature coefficient is +14 mV/K. Over a 165 K span (–40 °C to +125 °C), total drift is +2.31 V - resulting in V_Z = 17.69 V to 22.31 V. Combined with ±2 % initial tolerance, worst-case regulation band spans 17.34 V to 22.76 V, requiring system-level compensation if sub-1 % accuracy is needed across full temperature range.

Can BZT52H-B20,115 replace BZX84-C20 in existing designs?

No - BZX84-C20 uses SOT-23 package (3-pin, different footprint and thermal characteristics), while BZT52H-B20,115 uses SOD123F (2-pin). Though both are 20 V Zeners, mechanical incompatibility prevents direct replacement. Electrical differences include higher P_tot (830 mW vs. 300 mW) and tighter tolerance (±2 % vs. ±5 %), but PCB redesign is mandatory for migration.