Taiwan Semiconductor Corporation 1SMB5952

Overview

1SMB5952 from Taiwan Semiconductor is a 3 W, 130 V nominal Zener diode in DO-214AA (SMB) surface-mount package, featuring glass-passivated junction, 2.9 mA test current, 5000 Ω dynamic impedance at 0.1×IZM, and 98.8 V maximum DC zener current. It regulates voltage in high-voltage DC/DC converters and SMPS feedback loops.

For engineers reviewing the 1SMB5952 datasheet, 1SMB5952 pinout, 1SMB5952 application, or 1SMB5952 equivalent, key selection criteria include its 130 V nominal zener voltage with ±5% tolerance, 150 °C max junction temperature, low-inductance SMB package, and compliance with J-STD-020 level 1 moisture sensitivity.

Technical Context

The 1SMB5952 operates as a single-die, unidirectional voltage reference diode optimized for stable DC regulation under reverse-bias conditions. Its 130 V nominal zener voltage is specified at 2.9 mA test current (IZT), with dynamic impedance of 5000 Ω measured at IZK = 0.1×IZM (0.29 mA).

Thermal performance is defined by 25 °C/W junction-to-lead resistance and 226 °C/W junction-to-ambient resistance (at TA = 25 °C). The device supports surge power handling per Fig.2 and exhibits a positive temperature coefficient above ~50 V, consistent with higher-voltage members of the 1SMB59xx family.

Key Specifications

Pinout & Package

DO-214AA (SMB) is a two-terminal surface-mount package with cathode band marking polarity. 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 SMF130A and BZX84-C130, the 1SMB5952 delivers 3× the power rating of the SOT-23 part and 2× that of the SMA device, making it uniquely suited for continuous 130 V regulation in compact yet thermally demanding power stages.

Availability

1SMB5952 is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and lighting applications requiring stable component supply with full RoHS and halogen-free compliance.

Supply support for 1SMB5952 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global power management and protection markets since 1979.

The 1SMB59xx series is designed specifically for high-reliability, surface-mount voltage regulation and transient suppression in industrial-grade power conversion systems, emphasizing thermal robustness and process consistency across the 11–200 V range.

FAQ

What is the nominal zener voltage and tolerance of the 1SMB5952?

The 1SMB5952 has a nominal zener voltage of 130 V with a ±5% tolerance, meaning its actual breakdown voltage falls between 123.5 V and 136.5 V at 2.9 mA test current and 25 °C ambient. This tolerance is confirmed in the Electrical Specifications table on page 2 of the M2102 datasheet and applies directly to the 1SMB5952 device marking code "952B".

What is the maximum DC zener current (I_ZM) for the 1SMB5952, and how is it derived?

The maximum DC zener current I_ZM for the 1SMB5952 is 11 mA, calculated as the current at which the product of V_Z (98.8 V) and I_ZM equals the rated 3 W power dissipation limit. This value appears in the "Maximum DC Zener Current" column of the Electrical Specifications table and reflects the upper boundary for continuous conduction without exceeding thermal limits.

Does the 1SMB5952 have a defined polarity marking, and how is it identified on the device?

Yes, the 1SMB5952 uses a cathode band to indicate polarity - a single dark band near one end of the DO-214AA (SMB) package. Per Mechanical Data section, this band identifies the cathode terminal, which must be connected to the higher-potential node in reverse-bias regulation applications. The anode is the unmarked end.

What is the junction-to-ambient thermal resistance (R_θJA) of the 1SMB5952, and under what conditions is it measured?

The junction-to-ambient thermal resistance R_θJA of the 1SMB5952 is 226 °C/W, measured at T_A = 25 °C with zero heat sinking. This value assumes standard JEDEC test conditions and defines the worst-case thermal gradient when mounted on a minimal PCB pad; actual performance improves significantly with copper pour or thermal vias.

Is the 1SMB5952 compliant with RoHS and halogen-free standards, and which specifications confirm this?

Yes, the 1SMB5952 is RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the FEATURES section of the M2102 datasheet. These compliance statements apply to the entire 1SMB5926–1SMB5956 family, including the 1SMB5952, and are verified through material declarations and third-party testing.