Taiwan Semiconductor Corporation TSZU52C20

Overview

TSZU52C20 from Taiwan Semiconductor is a surface-mount 20 V ±5% Zener diode in 0603 package, rated for 150 mW power dissipation, 5 mA test current, and 50 Ω dynamic impedance at 5 mA, used for precision voltage regulation in compact DC-DC feedback loops and reference circuits.

For engineers reviewing the TSZU52C20 datasheet, TSZU52C20 pinout, TSZU52C20 application, or TSZU52C20 equivalent, key selection criteria include zener voltage tolerance (±5%), low leakage current (0.1 µA at 15 V), temperature-stable operation (−55°C to +125°C), and compatibility with automated SMT assembly on space-constrained PCBs.

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled V_Z = 19.0–21.0 V at I_Z = 5 mA, exhibiting 50 Ω dynamic impedance (Z_ZT) and 220 Ω rising impedance (Z_ZK) at knee current. Its gold-plated 0603 terminals support reflow soldering per MIL-STD-750 Method 2026.

The device features a single-die configuration with cathode band polarity marking, operates across −55°C to +125°C junction temperature range, and maintains <0.1 µA leakage at VR = 15 V - critical for low-power bias networks and sensor reference stability.

Key Specifications

Pinout & Package

Package: 0603 surface-mount, leadless, gold-plated terminals; polarity indicated by cathode band on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX584C20 and MMBZ5242B, TSZU52C20 offers optimal balance of 0603 manufacturability, 150 mW thermal envelope, and 50 Ω regulation stiffness - making it preferred for cost-sensitive, space-constrained consumer and industrial SMPS designs.

Availability

TSZU52C20 is available at Aetrix Electronics and suitable for switch-mode power supplies, microcontroller reference circuits, industrial sensor interfaces, and USB-C power delivery clamp circuits requiring stable component supply and RoHS-compliant sourcing.

Supply support for TSZU52C20 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 industrial, automotive, and consumer markets since 1979.

The TSZU52C series targets high-volume, space-constrained voltage regulation applications - emphasizing tight V_Z tolerance, low leakage, and full RoHS/halogen-free compliance for modern SMT production.

FAQ

What is the exact zener voltage range for TSZU52C20?

The TSZU52C20 has a guaranteed zener voltage range of 19.0 V to 21.0 V at 5 mA test current (I_Z), representing ±5% tolerance around the nominal 20 V rating. This specification is measured at T_A = 25°C and is validated per Taiwan Semiconductor's G2009 datasheet revision. The TSZU52C20 maintains this range across its full operating temperature span.

What is the maximum power dissipation of TSZU52C20 and how does it affect circuit design?

The TSZU52C20 has a maximum power dissipation (P_D) of 150 mW at T_A = 25°C. This limits continuous zener current to approximately 7.5 mA at 20 V. Designers must apply derating curves (e.g., linear reduction above 25°C ambient) and verify junction temperature stays ≤125°C. The TSZU52C20's 0603 package requires careful copper pour and thermal relief consideration in layout.

Does TSZU52C20 have a specified leakage current, and under what conditions?

Yes, TSZU52C20 specifies a maximum leakage current (I_R) of 0.1 µA at V_R = 15 V and T_A = 25°C. This value is critical for high-impedance reference networks, where even nanoamp-level leakage introduces measurable error. The TSZU52C20 maintains this performance across its full −55°C to +125°C operating range, as confirmed in the official electrical specifications table.

What package type and dimensions does TSZU52C20 use, and is it compatible with standard SMT processes?

TSZU52C20 uses the 0603 surface-mount package (1.6 mm × 0.8 mm × 0.45 mm height) with gold-plated terminations qualified per MIL-STD-750 Method 2026. It is fully compatible with standard reflow soldering profiles (including lead-free) and automated pick-and-place equipment. The cathode band marking aligns with IPC-7351B land pattern recommendations for reliable optical recognition and placement.

How does TSZU52C20 compare to other Zener diodes in the same family regarding dynamic impedance?

TSZU52C20 exhibits a dynamic impedance (Z_ZT) of 50 Ω at 5 mA test current - consistent with mid-voltage members (15–24 V) of the TSZU52C series. Lower-voltage variants (e.g., TSZU52C5V1) show higher Z_ZT (~60 Ω), while higher-voltage parts (e.g., TSZU52C39) rise to 90 Ω. This behavior is inherent to silicon Zener physics and is explicitly documented in the TSZU52C2V0–TSZU52C39 datasheet's electrical table.