Nexperia USA Inc. BZT5250H-B6V2-QX

Overview

BZT5250H-B6V2-QX from Nexperia is a low-current Zener diode in SOD123F package, designed for precision voltage regulation at 6.2 V nominal with ±2 % tolerance, specified at 50 µA test current, and qualified to AEC-Q101 for automotive power rail stabilization and low-bias sensor biasing.

For engineers reviewing the BZT5250H-B6V2-QX datasheet, BZT5250H-B6V2-QX pinout, BZT5250H-B6V2-QX application, or BZT5250H-B6V2-QX equivalent, this device serves as a stable, low-leakage reference in battery-powered ECUs, portable instrumentation front-ends, and automotive LED current-setting circuits where thermal stability and compact SMD fit are critical.

Technical Context

This Zener operates in reverse breakdown mode with a nominal 6.2 V regulation voltage at I_Z = 50 µA, exhibiting a low differential resistance of 160 Ω at 5 mA and a near-zero temperature coefficient of +0.4 mV/K - enabling stable reference performance across -55 °C to +150 °C ambient range. Its intentional minor leakage rise improves switching speed and noise suppression per AN90031.

The device uses silicon planar Zener technology in an SOD123F package with cathode-marked anisotropic termination, delivering 830 mW total power dissipation on FR4 PCB with 1 cm² cathode pad and junction-to-ambient thermal resistance of 150 K/W under standard mounting conditions.

Key Specifications

Pinout & Package

SOD123F surface-mount plastic package: 2.6 mm × 1.6 mm × 1.1 mm body, flat lead profile, cathode marked by bar on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5234BS and BZX84-C6V2, BZT5250H-B6V2-QX delivers tighter tolerance, superior thermal robustness, and automotive qualification - making it the only choice for ASIL-compliant voltage references where long-term drift and surge resilience are design-critical.

Availability

BZT5250H-B6V2-QX is available at Aetrix Electronics and suitable for automotive ECU design, portable medical instrumentation, industrial PLC input stages, and LED lighting control requiring stable component supply with full traceability and lifecycle continuity.

Supply support for BZT5250H-B6V2-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 energy-efficient solutions.

BZT5250H-Q series belongs to Nexperia's AEC-Q101-qualified Zener portfolio, engineered specifically for low-current, high-stability voltage regulation in automotive and portable industrial systems where precision, thermal resilience, and long-term reliability are mandatory.

FAQ

What is the maximum reverse voltage this Zener can safely clamp?

The absolute maximum reverse voltage is defined by its 6.2 V nominal Zener voltage and ±2 % tolerance, yielding a guaranteed clamping range of 6.08 V to 6.32 V at 50 µA. It must not be subjected to reverse voltages exceeding its peak non-repetitive power limit of 40 W (tp = 100 µs), and continuous reverse bias must remain within the 830 mW total power dissipation limit at ambient ≤25 °C with proper PCB thermal pad.

Is this device suitable for use in a 12 V automotive system?

Yes - BZT5250H-B6V2-QX is AEC-Q101 qualified and rated for operation from -55 °C to +150 °C junction temperature. Its 6.2 V regulation point makes it ideal for deriving stable sub-rail references (e.g., for 5 V or 3.3 V LDO inputs) from noisy 12 V vehicle batteries, and its low leakage (<1 µA at 5 V) prevents parasitic drain during ignition-off states.

How does the "intentional minor rise of leakage current" improve performance?

Per AN90031, this controlled increase in reverse leakage enhances carrier injection dynamics, reducing minority-carrier storage time and improving transient response. In practice, it lowers high-frequency noise in regulation loops and accelerates recovery after overvoltage events - particularly beneficial in feedback networks of DC-DC converters and precision sensor interfaces.

Can this Zener replace a standard 1N4735A in existing designs?

No - although both regulate at ~6.2 V, BZT5250H-B6V2-QX is a low-current device specified at 50 µA and rated for only 830 mW, whereas 1N4735A is a 1 W through-hole part tested at 31 mA. Substitution requires verifying that operating current stays below 5 mA and thermal layout supports SOD123F's lower power capability; direct replacement may cause regulation instability or thermal failure.