Renesas RKZ13B2KJ#R1

Overview

RKZ13B2KJ from Renesas Electronics is a silicon planar Zener diode designed for surge absorption and voltage stabilization in low-power signal-line protection circuits, featuring a nominal Zener voltage of 13.2 V (min 12.91 V, max 13.49 V), 2 mA reverse current at 10.0 V test condition, 35 Ω dynamic resistance at 5 mA, 150 mW power dissipation, and ESD capability of ±30 kV (IEC 61000-4-2, C = 150 pF, R = 330 Ω).

For engineers reviewing the RKZ13B2KJ datasheet, RKZ13B2KJ pinout, RKZ13B2KJ application, or RKZ13B2KJ equivalent, this device serves as a compact, surface-mount voltage clamp for I/O line transient suppression, precision reference buffering, and low-current regulator feedback paths in space-constrained consumer and industrial electronics.

Technical Context

The RKZ13B2KJ operates as a two-terminal voltage-reference device with fixed breakdown behavior governed by controlled doping and planar junction geometry. Its Zener mechanism dominates in the 13 V range, delivering stable regulation under DC bias and fast transient clamping response due to low junction capacitance and minimal stored charge.

Designed for ambient temperatures from −55°C to +150°C, it maintains specified electrical characteristics across its full storage and operating range. The ultra-small Flat Lead Package (UFP, SC-79) enables high-density PCB layouts while supporting reflow soldering per JEDEC J-STD-020, with thermal derating defined up to 150 mW at 25°C ambient.

Key Specifications

Pinout & Package

Ultra-small Flat Lead Package (UFP, JEITA code PWSF0002ZA-A, SC-79 compliant) with exposed lead tips for reliable solder wetting. Two-terminal construction: Cathode (Pin 1) marked with cathode symbol; Anode (Pin 2) unmarked.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ13VDW-7-F and BZX584-C13, the RKZ13B2KJ offers tighter V_Z tolerance (±2.2%), lower dynamic resistance, and optimized thermal performance in the UFP package-making it preferred for precision-clamp and low-drift reference roles where board space permits its slightly larger footprint.

Availability

RKZ13B2KJ 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 long-term manufacturing continuity.

Supply support for RKZ13B2KJ 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, power, and timing solutions for automotive, industrial, and enterprise systems.

The RKZ-KJ Series is part of Renesas' discrete protection portfolio, engineered specifically for high-reliability, low-leakage voltage stabilization and transient suppression in compact, surface-mount consumer and industrial electronics.

FAQ

What is the exact Zener voltage range for RKZ13B2KJ at 5 mA test current?

The RKZ13B2KJ exhibits a Zener voltage range of 12.91 V to 13.49 V when tested at I_Z = 5 mA, corresponding to a ±2.2% tolerance about the nominal 13.2 V value. This specification is guaranteed per Renesas datasheet REJ03G1588-0100 Rev.1.00 and applies to all units shipped under this part number. The RKZ13B2KJ's tight tolerance supports precision clamping in reference and protection circuits where voltage accuracy directly impacts system-level performance.

Does RKZ13B2KJ support lead-free reflow soldering processes?

Yes, the RKZ13B2KJ uses lead-free terminations with NiPdAu plating and is qualified for standard Pb-free reflow profiles per JEDEC J-STD-020. Its UFP package withstands peak temperatures up to 260°C for 30 seconds, making it compatible with Type 3 and Type 4 solder pastes. The RKZ13B2KJ's thermal design-validated for 150 mW dissipation at 25°C ambient-ensures no parameter shift or mechanical stress during compliant reflow cycles.

How does the ESD rating of RKZ13B2KJ compare to typical IEC 61000-4-2 requirements?

The RKZ13B2KJ delivers ±30 kV contact discharge ESD immunity per IEC 61000-4-2 (C = 150 pF, R = 330 Ω), exceeding Level 4 (±8 kV contact) by nearly 4×. This margin enables robust front-end protection for unprotected I/O lines in handheld and industrial equipment. The RKZ13B2KJ achieves this via optimized junction design and low parasitic capacitance, ensuring clamping action initiates before downstream ICs experience stress.

Can RKZ13B2KJ be used in place of a 13 V Zener diode with looser tolerance, such as BZX584-C13?

The RKZ13B2KJ can serve as a functional alternative to BZX584-C13 in many 13 V clamping applications, but differences exist: RKZ13B2KJ offers ±2.2% V_Z tolerance versus ±5%, lower dynamic resistance (35 Ω vs. 40 Ω), and lower power rating (150 mW vs. 300 mW). The RKZ13B2KJ is preferred where precision and low impedance matter most; BZX584-C13 suits higher-energy surge scenarios where tighter tolerance is not critical.

What is the thermal derating behavior of RKZ13B2KJ above 25°C ambient?

The RKZ13B2KJ's power dissipation linearly derates above 25°C ambient at 1.2 mW/°C, reaching zero at 150°C junction temperature. For example, at 85°C ambient, maximum allowable P_d drops to 78 mW. This derating curve is defined in Figure 3 of the RKZ13B2KJ datasheet and reflects its UFP package's thermal resistance (R_θJA ≈ 83°C/W). Designers must apply this curve when calculating safe operating area in enclosed or high-temperature environments using RKZ13B2KJ.