Renesas RKZ6.8Z4MFAKT#P1

Overview

RKZ6.8Z4MFAKT from Renesas Electronics is a silicon planar Zener diode array with four monolithic devices in a single VSON-5 package, designed for surge absorption and ESD protection on signal lines. It delivers 6.8 V nominal Zener voltage at 5 mA, 4.0 pF typical capacitance, and 8 kV ESD capability (IEC 61000-4-2), making it suitable for high-density USB, HDMI, and LVDS interface protection.

For engineers reviewing the RKZ6.8Z4MFAKT datasheet, RKZ6.8Z4MFAKT pinout, RKZ6.8Z4MFAKT application, or RKZ6.8Z4MFAKT equivalent, key selection criteria include low-capacitance clamping performance, multi-device integration in VSON-5, surge power handling per device, and cathode-common configuration for bidirectional transient suppression.

Technical Context

This quad Zener diode array integrates four identical, isolated Zener elements sharing a common cathode terminal layout (Pins 1, 2, 5 = cathode; Pin 4 = anode). Each device operates independently with 6.8 V nominal breakdown, enabling simultaneous protection of four signal lines without cross-coupling.

Its 4.0 pF typical junction capacitance and 60 Ω dynamic resistance support high-speed data line protection up to 1 Gbps, while the 8 kV ESD rating applies across all cathode-anode pairs under both forward and reverse polarity pulses per IEC 61000-4-2.

Key Specifications

Pinout & Package

VSON-5 surface-mount package (JEITA code PUSN0005KB-A), 1.6 mm × 1.3 mm footprint, 0.5 mm pitch, 0.6 mm height - optimized for automated placement and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener-based ESD protection applications.

Compared with NZQ6V8B2T5G and DF2S6.8CT, RKZ6.8Z4MFAKT provides the only monolithic quad solution in VSON-5, delivering optimal board-area efficiency and inter-channel parameter matching-critical for differential signaling where skew and imbalance degrade timing margins.

Availability

RKZ6.8Z4MFAKT is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI TMDS channel safeguarding, and industrial LVDS signal conditioning requiring stable component supply and long-term lifecycle assurance.

Supply support for RKZ6.8Z4MFAKT 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 specializing in microcontrollers, analog, and power devices, with deep expertise in automotive, industrial, and infrastructure applications.

The RKZ series was developed specifically for high-density, low-capacitance ESD protection in next-generation serial interfaces-addressing the need for integrated, space-constrained transient suppression without compromising signal fidelity.

FAQ

What is the Zener voltage tolerance for RKZ6.8Z4MFAKT?

The RKZ6.8Z4MFAKT has a Zener voltage range of 6.46 V to 7.14 V (±5%) at 5 mA test current, as derived from the 6.8 V nominal value and the ±0.34 V deviation specified in the electrical characteristics table. This tight tolerance ensures consistent clamping behavior across production lots and temperature ranges, critical for protecting 3.3 V and 5 V logic interfaces without false triggering.

Can RKZ6.8Z4MFAKT be used for bidirectional signal lines like RS-485?

Yes, RKZ6.8Z4MFAKT supports bidirectional protection due to its symmetrical cathode-common configuration and 8 kV ESD rating in both forward and reverse directions per IEC 61000-4-2. When applied across an RS-485 differential pair, it clamps transients on both A and B lines simultaneously while maintaining common-mode voltage stability, provided the anode (Pin 4) connects to the signal line and cathodes (Pins 1/2/5) tie to ground.

Is RKZ6.8Z4MFAKT RoHS compliant and lead-free?

Yes, RKZ6.8Z4MFAKT is RoHS compliant and lead-free, as confirmed by Renesas Electronics' environmental compliance documentation and material declarations. The VSON-5 package uses matte tin plating on copper leads, and the device meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), allowing unlimited floor life at ≤30°C/60% RH without baking prior to reflow.

How does the thermal derating of RKZ6.8Z4MFAKT work above 25°C ambient?

RKZ6.8Z4MFAKT's power dissipation derates linearly from 150 mW at 25°C to zero at 150°C junction temperature, following a slope of −1.25 mW/°C. For example, at 85°C ambient with typical PCB thermal resistance, the usable power drops to ~75 mW per device group-requiring surge energy calculations using the non-repetitive PRSM curve in Figure 3 to ensure safe operation under repeated transient conditions.

What is the function of Pin 3 on RKZ6.8Z4MFAKT?

Pin 3 on RKZ6.8Z4MFAKT is a no-connect (NC) terminal-internally unconnected and electrically isolated from all active Zener elements. Renesas specifies that Pin 3 must remain unconnected in the PCB layout; soldering or grounding it may cause internal stress or parasitic coupling, potentially degrading ESD performance or causing premature failure during surge events.