Renesas RKZ2.7B2KJ#R1

Overview

RKZ2.7B2KJ from Renesas Electronics is a silicon planar Zener diode designed for surge absorption and voltage stabilization in low-power signal conditioning and protection circuits, with a nominal Zener voltage of 2.75 V (min 2.65 V, max 2.90 V), 150 mW power dissipation, 110 Ω dynamic resistance at 5 mA, and ±30 kV ESD capability per IEC 61000-4-2.

For engineers reviewing the RKZ2.7B2KJ datasheet, RKZ2.7B2KJ pinout, RKZ2.7B2KJ application, or RKZ2.7B2KJ equivalent, this device serves as a precision low-voltage clamp in battery-powered sensor interfaces, USB line protection, and microcontroller I/O rail stabilization where tight voltage tolerance and high ESD immunity are required.

Technical Context

The RKZ2.7B2KJ operates as a two-terminal voltage reference and transient suppressor, leveraging silicon planar junction technology to deliver stable reverse breakdown behavior under DC bias and fast transient conditions. Its design targets low-current regulation (IZ = 5 mA test condition) and robust electrostatic discharge resilience without requiring external series impedance for basic ESD clamping.

It features a temperature coefficient of approximately −0.06 %/°C near 2.7 V (inferred from Fig.2 trend), enabling predictable drift in ambient-temperature-stable applications. The UFP (Ultra small Flat Lead Package) supports high-density surface-mount assembly while maintaining thermal performance up to 150°C junction temperature.

Key Specifications

Pinout & Package

Package: Ultra small Flat Lead Package (UFP), JEITA code PWSF0002ZA-A, SC-79 compatible, mass 0.0016 g. Dimensions: 1.10 mm × 0.70 mm × 0.35 mm (L × W × H).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX584C2V7LT1G and MMSZ4677T1G, the RKZ2.7B2KJ offers tighter voltage tolerance (±4.5% vs. ±5%), smallest board area (0.77 mm²), and identical ESD rating-making it optimal for ultra-compact, precision-clamp applications where layout density and regulation accuracy are prioritized over raw power handling.

Availability

RKZ2.7B2KJ is available at Aetrix Electronics and suitable for USB interface protection, microcontroller I/O safeguarding, and low-power sensor reference applications requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.

Supply support for RKZ2.7B2KJ 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 manufacturer specializing in microcontrollers, analog and power devices, and system-on-chip solutions for industrial, automotive, and infrastructure markets.

The RKZ-KJ Series belongs to Renesas' discrete protection portfolio, engineered specifically for compact, high-reliability surge absorption and voltage stabilization in space-constrained, low-power electronic systems.

FAQ

What is the Zener voltage tolerance of RKZ2.7B2KJ?

The RKZ2.7B2KJ has a guaranteed Zener voltage range of 2.65 V to 2.90 V at 5 mA test current, corresponding to ±0.125 V (±4.5%) around the nominal 2.75 V value. This tight tolerance is confirmed in the Electrical Characteristics table of the REJ03G1588-0100 datasheet and enables accurate clamping in 3.3 V and 2.8 V logic domains without additional calibration. RKZ2.7B2KJ maintains this specification across its rated operating temperature range.

Does RKZ2.7B2KJ support automated SMT assembly?

Yes, RKZ2.7B2KJ is supplied in embossed taping reel format (PWSF0002ZA-A) compatible with standard 8 mm tape feeders used in high-speed pick-and-place machines. Its UFP package features flat leads and precise dimensional control (1.10 × 0.70 × 0.35 mm), ensuring reliable placement and solder joint formation during reflow. RKZ2.7B2KJ meets IPC-J-STD-020 moisture sensitivity level 1 requirements for unlimited floor life at ≤30°C/85% RH.

What is the maximum reverse current for RKZ2.7B2KJ at 1.0 V?

The maximum reverse current (I_R) for RKZ2.7B2KJ is 120 μA when reverse-biased at 1.0 V, as specified in the Electrical Characteristics table. This low leakage ensures minimal power loss and signal distortion in standby or high-impedance monitoring circuits. RKZ2.7B2KJ maintains this performance across its full storage temperature range (−55°C to +150°C), supporting reliable operation in harsh environments.

Can RKZ2.7B2KJ be used for bidirectional ESD protection?

RKZ2.7B2KJ is a unidirectional Zener diode optimized for cathode-to-anode reverse breakdown; however, its ±30 kV HBM ESD rating applies to both forward and reverse polarity pulses per the datasheet note. For true bidirectional protection, two RKZ2.7B2KJ devices must be connected in series opposition (anode-to-anode). RKZ2.7B2KJ alone protects only the cathode-side node against positive transients and the anode-side node against negative transients.

What is the thermal resistance junction-to-ambient for RKZ2.7B2KJ?

The RKZ2.7B2KJ does not specify a numerical junction-to-ambient thermal resistance (R_θJA) in the datasheet, but its power derating curve (Fig.3) shows linear reduction from 150 mW at 25°C to 0 mW at ~150°C, implying an effective R_θJA of approximately 833°C/W on standard polyimide PCB. This value is derived from ΔT = P × R_θJA, where 125°C rise corresponds to 150 mW. RKZ2.7B2KJ's UFP package relies on PCB copper area for heat spreading rather than internal thermal vias.