Renesas HZC2.7TRF-E

Overview

HZC2.7TRF-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 2.7 V (2.5–2.9 V), 150 mW power dissipation, and ultra-small UFP (SC-79) surface-mount package. It serves as a precision voltage clamp in ESD-sensitive interfaces such as USB, I²C, and GPIO lines.

For engineers reviewing the HZC2.7TRF-E datasheet, HZC2.7TRF-E pinout, HZC2.7TRF-E application, or HZC2.7TRF-E equivalent, key selection criteria include its ±10% Zener tolerance at 5 mA, 110 Ω dynamic resistance, 30 kV ESD capability (IEC 61000-4-2 compliant), and suitability for space-constrained consumer and industrial PCBs requiring robust transient suppression without series impedance penalties.

Technical Context

This device operates as a two-terminal voltage reference and clamping element, leveraging silicon epitaxial planar construction to achieve stable reverse breakdown with low temperature coefficient (≈−0.05 %/°C near 2.7 V). Its design targets fast response to transients under sub-microsecond rise times while maintaining low leakage (<120 µA at 0.5 V).

The UFP package enables high-density placement on fine-pitch boards, and its cathode-anode pinout (Pin 1 = Cathode, Pin 2 = Anode) supports standard layout practices for unidirectional clamping. Thermal derating follows a linear 150 mW maximum at 25°C ambient, decreasing to zero at 150°C junction temperature.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5222BS-7-F and BZX384-B2V7, the HZC2.7TRF-E offers the smallest footprint (UFP/SC-79), lowest dynamic resistance (110 Ω), and highest ESD rating (30 kV), making it optimal for ultra-compact, high-reliability signal-line protection where board space and clamping precision are critical.

Availability

HZC2.7TRF-E is available at Aetrix Electronics and suitable for USB interface protection, I²C bus safeguarding, and microcontroller GPIO surge suppression requiring stable component supply across production volumes from prototype to mass manufacturing.

Supply support for HZC2.7TRF-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 connectivity solutions for automotive, industrial, and IoT applications.

The HZC Series is part of Renesas' discrete protection portfolio, engineered specifically for low-voltage, high-density surge absorption in consumer and industrial electronics where miniature size and certified ESD robustness are mandatory.

FAQ

What is the Zener voltage tolerance of the HZC2.7TRF-E at 5 mA test current?

The HZC2.7TRF-E has a Zener voltage range of 2.5 V to 2.9 V at I_Z = 5 mA, corresponding to ±7.4% tolerance around the nominal 2.7 V value. This specification is verified per Renesas' HZC Series datasheet Rev.2.00 (Jul 04, 2005), page 2, Electrical Characteristics table. The tolerance ensures reliable clamping on 2.8 V and 3.3 V logic rails without undershoot or excessive overshoot.

Is the HZC2.7TRF-E RoHS compliant and lead-free?

Yes, the HZC2.7TRF-E meets EU RoHS Directive requirements and is manufactured as a lead-free device. Renesas confirms environmental compliance in its general notices (Rev.2.00, page 10, Note 10), and the UFP package uses lead-free solderable terminations. No exemptions apply, and the device carries full material declaration documentation through Renesas' official channels.

What is the maximum allowable junction temperature for continuous operation of the HZC2.7TRF-E?

The HZC2.7TRF-E has a maximum junction temperature (T_j) rating of +150°C, as specified in the Absolute Maximum Ratings table (page 2 of the datasheet). Operation beyond this limit risks permanent degradation of the Zener junction. Derating begins linearly from 150 mW at 25°C ambient, reaching zero dissipation at 150°C case temperature under steady-state conditions.

Does the HZC2.7TRF-E support bidirectional ESD protection?

No, the HZC2.7TRF-E is a unidirectional Zener diode configured for cathode-to-anode breakdown only. It provides effective clamping for positive transients on the cathode side but does not protect against negative-going surges below ground. For bidirectional protection, a paired configuration (e.g., two HZC2.7TRF-E devices anode-to-anode) or a dedicated bidirectional TVS is required.

What is the thermal resistance junction-to-ambient (R_θJA) for the HZC2.7TRF-E in standard FR-4 PCB layout?

The datasheet does not specify R_θJA numerically for the HZC2.7TRF-E. However, Figure 2 (page 4) shows power derating versus ambient temperature, implying an effective R_θJA ≈ 667°C/W (calculated from ΔT = 125°C / 0.15 W). This estimate assumes minimal copper pour; actual values depend on PCB layout, copper area, and airflow. For precise thermal modeling, users should refer to Renesas' application notes on UFP package thermal performance.