Toshiba Semiconductor and Storage CUHZ20V,H3F

Overview

CUHZ20V,H3F from Toshiba Electronic Devices & Storage Corporation is a silicon epitaxial planar Zener diode designed for voltage surge protection in DC power rails and I/O lines. It delivers a nominal Zener voltage of 20 V (min 18.8 V, max 21.2 V at 10 mA), dynamic resistance of 0.13 Ω, clamp voltage of 20.6 V at 16 A TLP, and peak pulse power handling of 2100 W per IEC61000-4-5 (8/20 μs). It is used in industrial sensor interfaces and automotive body control modules to suppress transient overvoltages.

For engineers reviewing the CUHZ20V,H3F datasheet, CUHZ20V,H3F pinout, CUHZ20V,H3F application, or CUHZ20V,H3F equivalent, key selection criteria include its 20 V Zener voltage tolerance, 2100 W IEC61000-4-5 pulse rating, 0.13 Ω dynamic resistance, 180 pF capacitance at 0 V, and US2H surface-mount package with verified cathode/anode terminal assignment.

Technical Context

The CUHZ20V,H3F operates as a bidirectional voltage-clamping device in reverse-biased configuration, leveraging silicon epitaxial planar junction technology for stable Zener breakdown and low dynamic impedance. Its ESD robustness (±30 kV contact per IEC61000-4-2) and high peak pulse current capability (36 A) support protection of sensitive analog and digital inputs against fast transients.

It is characterized under standardized test conditions: Zener voltage measured at 10 mA, dynamic resistance extracted via TLP (Z₀ = 50 Ω, 100 ns pulse, 300 ps rise time), and clamp voltage specified at ITLP = 16 A. Total capacitance of 180 pF at VR = 0 V enables use in moderate-speed signal lines without excessive signal distortion.

Key Specifications

Pinout & Package

The CUHZ20V,H3F is housed in the US2H surface-mount package (2-pin, SOD-323F variant), measuring 1.7 × 1.25 × 0.9 mm (typ.) and weighing 5.4 mg. The package features gull-wing leads optimized for reflow soldering and automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener-based transient voltage suppression applications.

Compared with SMF20A and P6SMB20A, the CUHZ20V,H3F offers the optimal balance of low dynamic resistance (0.13 Ω), compact US2H footprint, and 2100 W pulse rating-making it preferred for high-density industrial and automotive electronics where both space and precise clamping performance are critical.

Availability

CUHZ20V,H3F is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and smart meter power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for CUHZ20V,H3F 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

Toshiba Electronic Devices & Storage Corporation is a Japanese semiconductor manufacturer specializing in power devices, logic ICs, and discrete components with emphasis on reliability and industrial-grade performance.

The CUHZ Series is part of Toshiba's transient voltage suppression portfolio, engineered specifically for high-reliability DC rail protection in harsh electromagnetic environments such as factory automation and vehicle electronics.

FAQ

What is the Zener voltage tolerance of CUHZ20V,H3F?

The CUHZ20V,H3F has a Zener voltage range of 18.8 V to 21.2 V at a test current of 10 mA, corresponding to ±6% tolerance around the nominal 20 V rating. This aligns with the E24 standard resistor series and ensures compatibility with existing 20 V reference designs without recalibration. The specification is guaranteed per production test at Ta = 25°C and remains stable across its operating temperature range.

Does CUHZ20V,H3F meet IEC61000-4-5 for surge immunity?

Yes, the CUHZ20V,H3F is rated for 2100 W peak pulse power per IEC61000-4-5 with an 8/20 μs waveform, supporting protection against severe surges including indirect lightning strikes. Its clamp voltage of 20.6 V at 16 A TLP and ±30 kV ESD rating per IEC61000-4-2 confirm full compliance with industrial and automotive surge immunity requirements. These values are measured and documented in Toshiba's official characterization data.

What is the thermal resistance and power derating behavior of CUHZ20V,H3F?

The CUHZ20V,H3F has two power dissipation ratings: 1200 mW when mounted on a 645 mm² copper pad, and 500 mW on a 4 mm × 4 mm pad. Its junction-to-ambient thermal resistance (r_th(j-a)) decreases with pulse width, enabling higher short-duration surge handling. Derating curves are provided in Toshiba's datasheet Figure PRSM–tw and PD–Ta, confirming safe operation up to 150°C junction temperature.

Can CUHZ20V,H3F be used in bidirectional signal lines like CAN or LIN?

Yes, the CUHZ20V,H3F functions as a unidirectional Zener clamp but is commonly deployed in bidirectional configurations-for example, back-to-back with another CUHZ20V,H3F or paired with a TVS diode-to protect differential buses. Its 180 pF capacitance at 0 V and low dynamic resistance make it suitable for 24 V LIN and low-speed CAN nodes, though discrete bidirectional TVS arrays may be preferred for full-duplex high-speed interfaces.

What marking code identifies CUHZ20V,H3F on the device body?

The CUHZ20V,H3F is marked with "M9" on its cathode-side surface, consistent with Toshiba's CUHZ Series marking list. This two-character code uniquely identifies the 20 V variant within the family and is laser-etched on the US2H package for traceability. No additional date or lot codes are included in the primary marking; full traceability is maintained through Aetrix Electronics' certified distribution chain.