Taiwan Semiconductor Corporation 1PGSMB5942H

Overview

1PGSMB5942H from Taiwan Semiconductor is a surface-mount silicon Zener diode with nominal zener voltage 51 V, 3 W power dissipation, 7.3 mA test current, 1100 Ω dynamic impedance at I_ZT, and DO-214AA (SMB) package. It serves as a precision voltage reference and overvoltage protection device in automotive power rails and industrial sensor signal conditioning circuits.

For engineers reviewing the 1PGSMB5942H datasheet, 1PGSMB5942H pinout, 1PGSMB5942H application, or 1PGSMB5942H equivalent, key selection criteria include zener voltage tolerance (±5%), junction temperature range (–55°C to +175°C), AEC-Q101 qualification, moisture sensitivity level 1, and thermal resistance (R_θJA = 59°C/W on 10 mm × 10 mm Cu pad).

Technical Context

The 1PGSMB5942H operates as a single-die, unidirectional Zener diode optimized for stable DC voltage regulation under reverse bias. Its photo-glass passivated junction ensures long-term stability and low leakage (<1 μA at 38.8 V), while its low-inductance SMB package supports high-frequency transient suppression in switching power supplies.

Designed for automotive-grade reliability, it meets AEC-Q101 stress testing requirements and features matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance. Thermal performance is characterized with R_θJL = 21°C/W and R_θJC = 23°C/W on standard PCB mounting conditions.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), surface-mount, single-anode/single-cathode configuration. Cathode indicated by molded band. Matte tin-plated leads, RoHS and halogen-free compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C51LT1G and SMBJ51A, the 1PGSMB5942H uniquely combines AEC-Q101 qualification, 3 W continuous power handling, ±5% V_Z tolerance, and low dynamic impedance-making it the only option among the three suitable for automotive-grade precision voltage reference and regulated shunt applications.

Availability

1PGSMB5942H is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interfaces, switching power supply feedback networks, and programmable logic controller I/O protection requiring stable component supply and AEC-Q101 compliance.

Supply support for 1PGSMB5942H 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, analog ICs, and protection components for automotive, industrial, and consumer markets.

The 1PGSMB59xxH series was developed to deliver AEC-Q101-qualified, high-reliability Zener diodes in SMB packages for voltage reference and overvoltage protection in harsh-environment applications.

FAQ

What is the nominal zener voltage of the 1PGSMB5942H and its tolerance?

The 1PGSMB5942H has a nominal zener voltage of 51 V with a tolerance of ±5%, corresponding to a guaranteed range of 48.45 V to 53.55 V at 7.3 mA test current. This tolerance is defined per the product family's 5% type number designation and verified under thermal equilibrium at 25°C ambient. The 1PGSMB5942H achieves this specification using a photo-glass passivated silicon junction for long-term stability.

Is the 1PGSMB5942H suitable for automotive applications?

Yes, the 1PGSMB5942H is AEC-Q101 qualified and specifically designed for automotive use. It passes stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing. Its –55°C to +175°C junction temperature range, MSL Level 1 rating, and matte tin-plated leads compliant with J-STD-002 make the 1PGSMB5942H appropriate for engine control units, body control modules, and ADAS power systems.

What is the maximum DC zener current (I_ZM) for the 1PGSMB5942H?

The maximum DC zener current I_ZM for the 1PGSMB5942H is 29 mA, calculated from its 3 W power rating and minimum zener voltage (48.45 V). This value is specified in the Electrical Specifications table and reflects the highest continuous reverse current the 1PGSMB5942H can sustain without exceeding P_tot under thermal equilibrium conditions at T_A = 25°C.

How does the thermal resistance of the 1PGSMB5942H affect PCB layout?

The 1PGSMB5942H has R_θJA = 59°C/W when mounted on a 10 mm × 10 mm Cu pad. To maintain T_J ≤ 175°C at full 3 W dissipation, the board must limit ambient temperature rise to ≤105°C - achievable with adequate copper area and airflow. Layout should maximize thermal pad exposure and avoid narrow traces; the 1PGSMB5942H's R_θJL = 21°C/W confirms efficient lead-to-board conduction, so thermal vias under pads significantly improve performance.

Does the 1PGSMB5942H have halogen-free and RoHS compliance documentation?

Yes, the 1PGSMB5942H is RoHS compliant and halogen-free per IEC 61249-2-21. These certifications are explicitly stated in the FEATURES section of the official datasheet (Version A2102), and the molding compound meets UL 94V-0 flammability rating. Compliance applies to the full 1PGSMB5926H–1PGSMB5956H family, including the 1PGSMB5942H, with no exemptions claimed.