Nexperia USA Inc. BZT52H-C22-QX

Overview

BZT52H-C22-QX from Nexperia is a ±5 % tolerance Zener diode in SOD123F package, rated for 22 V nominal breakdown voltage at I_Z = 5 mA, with 830 mW total power dissipation and AEC-Q101 qualification for automotive voltage regulation. It provides stable reference voltage in low-power biasing, overvoltage clamping, and supply rail stabilization circuits.

For engineers reviewing the BZT52H-C22-QX datasheet, BZT52H-C22-QX pinout, BZT52H-C22-QX application, or BZT52H-C22-QX equivalent, this page delivers verified Zener parameters, thermal resistance values, reverse current behavior at 20 V, differential resistance under regulation, and automotive-grade reliability context - all critical for precision analog design and automotive ECU power management.

Technical Context

This Zener diode operates in reverse-biased breakdown mode to maintain a stable 22 V reference across its terminals when current exceeds the knee threshold (I_Z ≥ 5 mA). Its temperature coefficient of +15.4 mV/K (typical) indicates positive drift with junction temperature rise, requiring compensation in high-accuracy references.

The device exhibits 220 Ω typical differential resistance at I_Z = 5 mA and supports non-repetitive peak reverse surge up to 1.25 A (100 μs pulse), enabling transient overvoltage suppression in 12 V/24 V automotive subsystems without external series limiting resistors in moderate-energy events.

Key Specifications

Pinout & Package

SOD123F surface-mount plastic package: 2.5–2.7 mm length × 1.2–1.5 mm width × 0.9–1.1 mm height; cathode marked by bar; optimized for reflow soldering on FR4 PCB 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 BZT52H-C22-QX, the BZT52H-B22-Q offers improved voltage accuracy at identical thermal performance, while MMSZ5247ET1G trades AEC-Q101 compliance for broader distributor availability and lower unit cost in non-automotive contexts.

Availability

BZT52H-C22-QX is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, infotainment power sequencing, and medical diagnostic equipment requiring stable component supply with guaranteed long-term sourcing.

Supply support for BZT52H-C22-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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.

The BZT52H-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for robust voltage regulation and transient protection in harsh automotive environments including engine bays and chassis-mounted ECUs.

FAQ

What is the maximum continuous Zener current for BZT52H-C22-QX at 85 °C ambient?

At T_amb = 85 °C, derating applies per thermal resistance data: R_th(j-a) = 330 K/W implies ΔT = 330 × (85 − 25) = 19.8 K above ambient at full power. With T_j(max) = 150 °C, allowable ΔT = 65 K → P_derated = 65 / 330 ≈ 197 mW. At 22 V, max continuous I_Z = 197 mW / 22 V ≈ 9.0 mA. This assumes minimal copper area; actual value depends on PCB layout.

Does BZT52H-C22-QX support bidirectional transient suppression?

No. BZT52H-C22-QX is a unidirectional Zener diode optimized for reverse-bias breakdown only. Forward conduction occurs at ~0.9 V (V_F), but it lacks symmetrical clamping capability. For bidirectional surge protection, a dedicated TVS diode such as PESD5V0S1BA should be used instead.

How does the +15.4 mV/K temperature coefficient impact regulation accuracy over −40 °C to +125 °C?

Over this 165 K range, voltage drift = 15.4 mV/K × 165 K ≈ 2.54 V. With nominal V_Z = 22 V, this represents ±5.8 % variation - within the ±5 % initial tolerance band. Thus, the temperature coefficient dominates long-term drift, making this part suitable for applications where absolute accuracy is secondary to robustness.

Can BZT52H-C22-QX replace BZX84-C22 in existing SOT-23 designs?

No. BZT52H-C22-QX uses SOD123F (2.6 × 1.3 mm) while BZX84-C22 uses SOT-23 (2.9 × 1.3 mm); their footprints are incompatible. Additionally, BZX84-C22 has higher r_dif (~350 Ω) and lower P_tot (300 mW). Direct replacement requires PCB redesign and verification of thermal performance under load.