Taiwan Semiconductor Corporation 1PGSMB5934

Overview

1PGSMB5934 from Taiwan Semiconductor is a surface-mount Zener diode with nominal zener voltage 24 V, 3 W power rating, 15.6 Ω dynamic impedance at 19 mA test current, and DO-214AA (SMB) package. It regulates voltage in DC/DC converters and SMPS feedback loops where stable reference under varying load is required.

For engineers reviewing the 1PGSMB5934 datasheet, 1PGSMB5934 pinout, 1PGSMB5934 application, or 1PGSMB5934 equivalent, key selection criteria include zener voltage tolerance (±5%), thermal resistance (R_θJA = 59 °C/W), junction temperature limit (175 °C), and moisture sensitivity level (MSL 1).

Technical Context

This single-die Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under variable current conditions. Its glass-passivated junction ensures long-term stability and low leakage (<1 μA at 18.2 V), while the SMB package enables automated placement and low-inductance PCB routing.

Designed for thermal reliability, it delivers 3 W dissipation at 75 °C lead temperature with linear derating above that point. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for industrial-grade power management circuits.

Key Specifications

Pinout & Package

DO-214AA (SMB) package with cathode indicated by band-marked end; leads are matte tin-plated and solderable per J-STD-002.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ24A and 1N5242B, the 1PGSMB5934 uniquely combines 24 V ±5% regulation, 3 W continuous dissipation, low 15.6 Ω dynamic impedance, and SMB surface-mount compatibility-making it suitable for modern high-efficiency, high-density power supply feedback circuits.

Availability

1PGSMB5934 is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and lighting applications requiring stable component supply, MSL-1 handling, and RoHS-compliant sourcing.

Supply support for 1PGSMB5934 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, including Zener, TVS, rectifier, and MOSFET products for industrial and consumer markets.

The 1PGSMB59xx series was developed to deliver high-reliability, surface-mount Zener diodes with tight voltage tolerance, low dynamic impedance, and robust thermal performance for next-generation power conversion systems.

FAQ

What is the nominal zener voltage and tolerance of the 1PGSMB5934?

The 1PGSMB5934 has a nominal zener voltage of 24 V with a tolerance of ±5%, meaning the actual V_Z falls between 22.80 V and 25.20 V at 19 mA test current and 25 °C ambient. This tolerance is confirmed in the Electrical Specifications table and applies directly to the 1PGSMB5934 device marking code P934B.

What is the maximum power dissipation rating for the 1PGSMB5934 and under what conditions?

The 1PGSMB5934 is rated for 3 W total power dissipation at a lead temperature (T_L) of 75 °C, measured with zero lead length on a 10 mm × 10 mm copper pad. Derating is linear above 75 °C, reaching zero dissipation at 175 °C junction temperature. This rating is specified in the Absolute Maximum Ratings table.

Does the 1PGSMB5934 have a defined polarity marking, and how is it identified?

Yes, the 1PGSMB5934 uses a cathode band to indicate polarity, located at the marked end of the DO-214AA (SMB) package. The band corresponds to the cathode terminal, which must be connected to the higher-potential node in reverse-bias regulation applications. This marking is documented in the Mechanical Data and Package Outline sections.

What is the zener impedance of the 1PGSMB5934 and why does it matter in circuit design?

The 1PGSMB5934 has a dynamic impedance (Z_ZT) of 15.6 Ω at 19 mA test current. This low value means the output voltage varies only ~0.3 V for a 20 mA change in current, making it suitable for precision reference and feedback applications where load regulation is critical-such as in SMPS voltage control loops.

Is the 1PGSMB5934 compliant with environmental and reliability standards?

Yes, the 1PGSMB5934 is RoHS compliant and halogen-free per IEC 61249-2-21. It carries MSL Level 1 per J-STD-020, passes JESD201 Class 2 whisker testing, and uses UL 94V-0 molding compound. These qualifications are explicitly stated in the Features and Mechanical Data sections of the official documentation.