STMicroelectronics BZW06-128RL

Overview

BZW06-128RL from STMicroelectronics is a unidirectional transient voltage suppression diode in DO-15 package, designed to clamp ESD and surge transients up to 600 W (10/1000 µs) with a stand-off voltage of 128 V, clamping voltage of 205 V at 3.3 A, and junction temperature rating up to +175 °C. It protects power rails and I/O lines in industrial power supplies and telecom interfaces against IEC 61000-4-2 (±30 kV contact/air) and IEC 61000-4-4 (4 kV level 4) threats.

For engineers reviewing the BZW06-128RL datasheet, BZW06-128RL pinout, BZW06-128RL application, or BZW06-128RL equivalent, key selection criteria include clamping voltage at rated peak pulse current, dynamic resistance, leakage current at VRM, thermal derating above 25 °C, and compatibility with FR4 PCB layouts using 70 µm copper traces.

Technical Context

The BZW06-128RL operates as a planar-junction avalanche diode, triggered when reverse voltage exceeds its breakdown threshold (VBR = 128 V min), entering low-impedance conduction to divert surge energy away from downstream circuitry. Its dynamic resistance (RD ≈ 29.5 Ω) and clamping behavior are characterized under standardized 10/1000 µs and 8/20 µs waveforms per IEC 61000-4-5.

It supports continuous operation from –55 °C to +175 °C junction temperature, with thermal impedance (Zth(j-a)) decreasing from ~40 °C/W for short pulses to ~3.5 °C/W with 5 cm² copper area per lead. Leakage current remains ≤0.2 µA at VRM = 128 V and 25 °C, rising to ~100 nA at 125 °C per Figure 9.

Key Specifications

Pinout & Package

DO-15 (JEDEC DO-204AC) axial-leaded package with cathode band marking; leads matte tin-plated for solderability and RoHS compliance. Dimensions: A = 6.05–6.75 mm length, B = 26–31 mm overall length, C = 2.95–3.53 mm diameter, D = 0.71–0.88 mm lead diameter.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient suppression applications.

Compared with SMBJ120A and P6KE130A, BZW06-128RL offers tighter VBR tolerance (128–142 V vs. 120–133 V or 130–144 V), lower clamping voltage (205 V vs. 219 V), and superior thermal stability up to +175 °C - making it optimal for high-reliability, high-temperature deployments.

Availability

BZW06-128RL is available at Aetrix Electronics and suitable for industrial power supplies, telecom interface protection, and automotive body control modules requiring stable component supply and long-term lifecycle support.

Supply support for BZW06-128RL 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The BZW06 series belongs to ST's high-power TVS diode portfolio, engineered specifically for robust overvoltage protection in harsh environments where thermal resilience and IEC-compliant surge handling are mandatory.

FAQ

What is the maximum peak pulse current (IPP) the BZW06-128RL can handle?

The BZW06-128RL sustains a peak pulse current of 3.3 A under the standard 10/1000 µs waveform at 25 °C ambient. At elevated junction temperatures, IPP derates linearly per thermal curves in Figure 3 of DS0661 Rev 7; at 125 °C, IPP drops to approximately 2.4 A due to reduced thermal headroom.

Is the BZW06-128RL bidirectional or unidirectional?

BZW06-128RL is unidirectional, indicated by the absence of "B" suffix (e.g., BZW06-128B would be bidirectional). Its cathode band marks the terminal that connects to the protected line, while the anode connects to ground or return path - enabling clamping only during negative transients relative to that reference.

How does the clamping voltage change with temperature?

VCL increases with junction temperature at a rate defined by αT = 10 × 10⁻⁴ /°C. For example, at Tj = 125 °C, VCL rises by (125 − 25) × 0.001 × 205 V ≈ 20.5 V above its 25 °C value, resulting in ~225.5 V clamping at 3.3 A - a critical factor in margin analysis for protected ICs.

Can BZW06-128RL be used in parallel for higher power handling?

Parallel connection is not recommended due to mismatch in VBR and dynamic resistance, which causes uneven current sharing and potential thermal runaway. ST specifies single-device operation only; for >600 W requirements, select higher-rated parts like BZW06-342RL or implement staged protection with MOVs and GDTs.