Renesas HZC2.4TRF-E

Overview

HZC2.4TRF-E from Renesas Electronics is a silicon epitaxial planar Zener diode optimized for surge absorption in low-voltage signal and power rail protection circuits, with a nominal Zener voltage of 2.4 V (min 2.30 V, max 2.60 V at 5 mA), 150 mW power dissipation, 30 kV ESD capability (IEC 61000-4-2), and ultra-small UFP package (SC-79). It serves as a precision clamping device in USB, I²C, and low-dropout regulator feedback paths.

For engineers reviewing the HZC2.4TRF-E datasheet, HZC2.4TRF-E pinout, HZC2.4TRF-E application, or HZC2.4TRF-E equivalent, key selection criteria include its 2.4 V Zener tolerance, 1.0 µA maximum reverse current at 1.0 V, 30 Ω typical dynamic resistance, temperature coefficient of ≈−0.03 %/°C, and suitability for space-constrained surface-mount designs requiring robust ESD immunity.

Technical Context

This Zener diode operates in reverse breakdown to clamp transient overvoltages, leveraging epitaxial planar construction for stable voltage regulation and low leakage. Its design targets fast response to ESD events (C = 150 pF, R = 330 Ω test condition) and stable performance across −55°C to +150°C storage range.

The device exhibits a negative temperature coefficient near 2.4 V (≈−0.03 %/°C), enabling predictable voltage drift in thermal cycling environments. Its 150 mW power rating is derated linearly above 25°C ambient, reaching zero dissipation at ~125°C per Fig.2 in the datasheet.

Key Specifications

Pinout & Package

Package: Ultra Small Flat Lead (UFP), JEITA code SC-79, Renesas code PWSF0002ZA-A, mass 0.0016 g, dimensions 1.70 × 1.20 × 0.60 mm (L × W × H).

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSZ2.4V2T5G and BZX584C2V4, HZC2.4TRF-E offers tighter voltage tolerance (±0.15 V vs. ±0.12 V), smaller UFP footprint (1.7 × 1.2 mm), and identical 30 kV ESD rating-making it optimal for miniaturized, precision-clamping designs where layout area and voltage accuracy are critical.

Availability

HZC2.4TRF-E is available at Aetrix Electronics and suitable for USB interface protection, I²C bus stabilization, and low-voltage LDO feedback applications requiring stable component supply, consistent parametric performance, and RoHS-compliant packaging.

Supply support for HZC2.4TRF-E 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

Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The HZC Series belongs to Renesas' discrete protection portfolio, engineered specifically for compact, high-reliability surge suppression in low-voltage digital interfaces and power management circuits.

FAQ

What is the Zener voltage tolerance of HZC2.4TRF-E at 5 mA test current?

HZC2.4TRF-E has a Zener voltage range of 2.30 V to 2.60 V at 5 mA, corresponding to ±0.15 V absolute tolerance or approximately ±6.25% of nominal 2.4 V. This tight spread ensures reliable clamping in 2.5 V system rails without risking undershoot or overshoot beyond IC absolute maximum ratings. The specification is verified per Renesas datasheet REJ03G1204-0200 Rev.2.00.

Does HZC2.4TRF-E meet IEC 61000-4-2 ESD immunity requirements?

Yes, HZC2.4TRF-E is rated for ±30 kV human-body model (HBM) ESD per test condition C = 150 pF, R = 330 Ω, both forward and reverse direction, meeting IEC 61000-4-2 Level 4. This makes HZC2.4TRF-E suitable for direct integration into end-equipment interfaces such as USB and I²C without additional protection stages. The rating is specified in the Electrical Characteristics table of the official Renesas datasheet.

What is the thermal derating behavior of HZC2.4TRF-E above 25°C ambient?

HZC2.4TRF-E's power dissipation decreases linearly from 150 mW at 25°C to 0 mW at approximately 125°C ambient, based on the "Power Dissipation vs. Ambient Temperature" curve (Fig.2) in the Renesas datasheet. This derating slope is ~1.33 mW/°C, meaning at 85°C ambient, usable P_d is reduced to ~72 mW. Designers must apply this curve when sizing trace copper or selecting enclosure ventilation for sustained surge duty cycles.

Can HZC2.4TRF-E be used in place of a standard 2.4 V Zener for voltage reference applications?

HZC2.4TRF-E is optimized for surge absorption-not precision voltage reference-with 30 Ω dynamic resistance and −0.03 %/°C temperature coefficient. While usable in non-critical feedback paths, it lacks the low r_d (<5 Ω) and tight tempco (<±0.001 %/°C) of dedicated references. For stable 2.4 V biasing, pair HZC2.4TRF-E only with low-impedance buffers; do not rely on it alone for ADC reference or oscillator biasing. Confirmed per Renesas HZC Series characterization data.

What is the marking code for HZC2.4TRF-E on the UFP package?

HZC2.4TRF-E is laser-marked with "24" on the top surface of the UFP package, per the Mark Code table in Renesas datasheet REJ03G1204-0200. The "TRF-E" suffix denotes tape-and-reel packaging (TR) and environmental compliance (E), while "24" unambiguously identifies the 2.4 V variant within the HZC family. No additional symbols or dots appear for this part number.