Nexperia USA Inc. NZX20B,133

Overview

NZX20B,133 from Nexperia is a single Zener diode in a hermetically sealed SOD27 (SC-40) glass package, designed for precision voltage regulation and reference functions at 20 V nominal Zener voltage (19.5–20.4 V range), with 60 Ω typical differential resistance at I_Z = 2 mA and ≤0.05 µA reverse leakage current. It operates across −55 °C to +175 °C ambient, supports 500 mW total power dissipation, and is used in low-power analog references and overvoltage protection circuits.

For engineers reviewing the NZX20B,133 datasheet, NZX20B,133 pinout, NZX20B,133 application, or NZX20B,133 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (R_th(j-a) = 380 K/W), axial-leaded SOD27 mechanical compatibility, and low-leakage performance under low-current bias conditions.

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled V_Z characteristics across temperature (−55 °C to +175 °C). Its differential resistance of 60 Ω at I_Z = 2 mA ensures stable regulation under small-signal load variations, while its 0.05 µA max reverse current at V_R = 14 V enables ultra-low standby power consumption in reference designs.

The device uses a hermetically sealed glass package (SOD27/SC-40) with axial leads and cathode band marking, delivering high reliability in harsh environments. Thermal resistance from junction to ambient is 380 K/W on FR4 PCB without metallization pad - a critical parameter for derating calculations in compact, unforced-air layouts.

Key Specifications

Pinout & Package

Package: SOD27 (SC-40), hermetically sealed axial-leaded glass package with cathode band marking; lead length ≤8 mm; dimensions: 4.25 mm max length × 1.85 mm max diameter.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX55C20 and 1N4744A, NZX20B,133 offers superior long-term stability due to hermetic sealing, tighter V_Z tolerance, and sub-µA leakage - making it preferred for metrology-grade references and sealed industrial sensors where recalibration intervals must exceed 5 years.

Availability

NZX20B,133 is available at Aetrix Electronics and suitable for industrial sensor references, power supply clamping, low-power battery monitoring, and calibration voltage standards requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for NZX20B,133 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 and industrial-grade components.

The NZX series targets general-purpose Zener regulation in demanding environments, emphasizing hermetic reliability, tight voltage tolerance, and wide temperature operation - specifically engineered for industrial instrumentation and power management where parameter drift is unacceptable.

FAQ

What is the maximum continuous Zener current for NZX20B,133 at 70 °C ambient?

At 70 °C ambient, derating applies: P_tot drops linearly from 500 mW at 25 °C to zero at 175 °C. At 70 °C, allowable power is 333 mW. With V_Z ≈ 20 V, maximum continuous Zener current is ~16.7 mA - confirmed by thermal resistance (380 K/W) and junction-to-ambient delta-T calculation.

Does NZX20B,133 meet automotive AEC-Q200 stress testing requirements?

No. NZX20B,133 is not AEC-Q200 qualified. The datasheet explicitly states "Non-automotive qualified products" and excludes automotive use unless separately validated. Its qualification scope covers industrial and commercial applications only, with no temperature cycling, vibration, or humidity testing per AEC-Q200.

How is the cathode identified on the NZX20B,133 package?

The cathode is marked by a distinct color band (typically black or dark stripe) on the glass body near one end. Pin 1 (cathode) is the banded end; Pin 2 (anode) is the unmarked end - consistent with Table 2 pinning and Figure 5 package outline in the official Nexperia datasheet Rev. 4.

Can NZX20B,133 be used in series for higher-voltage references?

Yes, but with caution. Series connection increases total dynamic impedance (sum of individual r_dif) and requires matched temperature coefficients to avoid thermal runaway. For 40 V reference, two NZX20B,133 units yield ~120 Ω combined r_dif, and their negative TC below 5 V and positive TC above 5 V partially cancel - verified in Figure 3 and Figure 4 of the datasheet.