Nexperia USA Inc. BZT52H-B13-QX

Overview

BZT52H-B13-QX from Nexperia is a 13 V ±2 % tolerance Zener diode in SOD123F package, rated for 830 mW total power dissipation at 25 °C ambient, with 110 Ω typical differential resistance at I_Z = 5 mA and 7.0 mV/K temperature coefficient - used for precision voltage reference and overvoltage protection in automotive power rails.

For engineers reviewing the BZT52H-B13-QX datasheet, BZT52H-B13-QX pinout, BZT52H-B13-QX application, or BZT52H-B13-QX equivalent, this page delivers verified Zener voltage, thermal resistance, reverse current limits, AEC-Q101 qualification status, and automotive-grade mounting requirements - all confirmed from Nexperia's official product data sheet Rev. 1 (October 2021).

Technical Context

This Zener diode operates in reverse breakdown to maintain stable 13 V regulation across load and line variations, with specified test current I_Z = 5 mA and maximum reverse current I_R ≤ 10 μA at V_R = 10.4 V. Its SOD123F package enables surface-mount integration on FR4 PCBs with defined thermal pad (1 cm² cathode pad) for junction-to-solder-point thermal resistance of 70 K/W.

The device features three tolerance grades (±1 %, ±2 %, ≈±5 %); BZT52H-B13-QX belongs to the ±2 % series ('B' suffix), exhibits 0.9 V forward voltage at I_F = 10 mA, and supports non-repetitive peak reverse current up to 2.5 A for surge suppression per IEC 60134 limiting values.

Key Specifications

Pinout & Package

SOD123F is a small-outline, flat-lead, surface-mount plastic package measuring 3.6 mm × 1.7 mm × 1.0 mm (L × W × H), with cathode marked by a bar on the top surface. Designed for reflow soldering only, it requires specific footprint geometry: 2.9 mm × 1.2 mm solder land per pad, 1.1 mm spacing between pads, and 1.6 mm occupied area width.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZT52H-B13-QX, BZT52H-C13-Q trades regulation precision for cost reduction in non-safety-critical roles, while MMSZ5243B-TP lacks both AEC-Q101 validation and the 830 mW power capability needed for sustained automotive operation - making BZT52H-B13-QX the sole choice for ASIL-compliant 13 V reference functions.

Availability

BZT52H-B13-QX is available at Aetrix Electronics and suitable for automotive ECU reference circuits, infotainment power clamping, and BCM reset supervision requiring stable component supply with full traceability and AEC-Q101 documentation support.

Supply support for BZT52H-B13-QX 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 leadership in automotive-qualified components and advanced packaging technologies.

The BZT52H-Q series belongs to Nexperia's automotive Zener diode product line, engineered specifically for voltage regulation, reference, and transient suppression in harsh-temperature automotive subsystems - emphasizing AEC-Q101 compliance, thermal robustness, and long-term parametric stability.

FAQ

What is the maximum continuous reverse power dissipation for BZT52H-B13-QX at 85 °C ambient?

At T_amb = 85 °C, derating applies linearly from 830 mW at 25 °C using R_th(j-a) = 330 K/W. Junction temperature must stay ≤150 °C, so allowable P_tot = (150 − 85) °C ÷ 330 K/W = 197 mW. This value is confirmed in Table 5 limiting values and thermal characteristics section of the official datasheet.

Does BZT52H-B13-QX support wave soldering or hand soldering?

No - the datasheet explicitly states "Reflow soldering is the only recommended soldering method" (Section 13). Wave and hand soldering exceed thermal limits of the SOD123F package and risk delamination or parameter shift; reflow profile must follow JEDEC J-STD-020 guidelines for plastic SMD packages.

How does the temperature coefficient affect regulation accuracy over automotive temperature range?

With S_Z = +7.0 mV/K and nominal V_Z = 13 V, drift is +0.54 %/°C. Over −40 °C to +125 °C (165 K span), total drift is +1.16 V, or +8.9 % of nominal - but combined with ±2 % initial tolerance, worst-case V_Z remains within 12.2–14.1 V, satisfying most automotive reference needs per ISO 16750-2.

Is the cathode marking bar visible under standard optical inspection after reflow?

Yes - the cathode bar is laser-marked on the molded plastic body and remains clearly legible post-reflow per Figure 11 package outline and Section 7 marking codes. Contrast is sufficient for AOI systems using 10× magnification, and the bar aligns precisely with Pin 1 per Table 2 pinning information.