Nexperia USA Inc. NZX12D,133

Overview

NZX12D,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 12 V nominal Zener voltage with ±5% tolerance. It delivers 5 mA test current, 35 Ω typical differential resistance, ≤0.1 µA reverse leakage at 9.8 V, and 500 mW total power dissipation - deployed in low-power analog reference circuits and overvoltage clamping in industrial sensor signal conditioning.

For engineers reviewing the NZX12D,133 datasheet, NZX12D,133 pinout, NZX12D,133 application, or NZX12D,133 equivalent, this device serves as a stable, low-leakage, axial-leaded Zener solution where thermal stability, tight voltage tolerance, and long-term reliability under ambient temperatures from −55 °C to +175 °C are critical selection criteria.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal working voltage of 12 V at I_Z = 5 mA, exhibiting a temperature coefficient near zero crossing between 5–10 mA (per Fig 4), enabling stable reference performance across operating current ranges. Its hermetic glass package ensures minimal parameter drift over time and humidity exposure.

The device complies with IEC 60134 absolute maximum ratings, supports continuous operation up to T_j = 175 °C, and achieves R_th(j-a) = 380 K/W in free air on FR4 PCB - confirming suitability for non-heatsinked, space-constrained regulation nodes requiring predictable thermal derating.

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 regulation applications.

Compared with BZX55-C12 and 1N4742A, NZX12D,133 offers superior long-term stability via hermetic sealing, lower leakage by two orders of magnitude, and guaranteed 175 °C junction operation - making it the preferred choice for mission-critical industrial reference and clamping where parameter drift must be minimized over decades.

Availability

NZX12D,133 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, low-power microcontroller reference design, RS-485 overvoltage clamping, and PLC I/O module rail protection requiring stable component supply across extended temperature and long-life deployments.

Supply support for NZX12D,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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, miniaturization, and robustness for industrial, automotive, and consumer applications.

The NZX series targets general-purpose Zener regulation with hermetic reliability, optimized for stable voltage reference and clamping in harsh environments - emphasizing long-term parametric consistency over cost-driven commodity alternatives.

FAQ

What is the Zener voltage tolerance for NZX12D,133?

The NZX12D,133 has a nominal Zener voltage of 12 V with a guaranteed range of 11.4 V to 12.7 V at I_Z = 5 mA, corresponding to ±5% tolerance per Table 8 in the official Nexperia datasheet Rev. 4 (2011). This tolerance is maintained across the full operating temperature range of −55 °C to +175 °C junction temperature.

Can NZX12D,133 replace BZX55-C12 in high-reliability applications?

No - while both are 12 V Zeners with 5% tolerance, NZX12D,133 uses a hermetic glass SOD27 package ensuring <0.1 µA leakage and stable parameters over decades, whereas BZX55-C12's plastic DO-35 package permits higher leakage (≤5 µA) and lacks guaranteed 175 °C continuous operation. Replacement requires requalification for long-term stability.

What is the maximum forward current rating for NZX12D,133?

The maximum continuous forward current (I_F) is 250 mA per Table 5 (Limiting Values), with a forward voltage of ≤1.5 V at I_F = 200 mA. Forward conduction is not its intended operating mode; the device is specified and characterized for reverse-bias Zener regulation only.

How does thermal resistance affect derating at elevated ambient temperatures?

With R_th(j-a) = 380 K/W in free air, power dissipation must be linearly derated above 25 °C ambient: P_max = 500 mW × (1 − (T_amb − 25)/150). At 85 °C ambient, maximum allowable power drops to 300 mW to maintain T_j ≤ 175 °C - confirmed by Nexperia's thermal characterization in Table 6.