onsemi BZX84C5V6LT1

Overview

BZX84C5V6LT1 from onsemi is a 5.6 V, ±5% tolerance Zener diode in SOT-23 package, rated for 225 mW power dissipation at 25°C on FR-5 board, with 40 Ω dynamic impedance at 5 mA test current and 1 µA reverse leakage at 3 V. It serves as a precision voltage reference or overvoltage clamp in low-power portable electronics.

For engineers reviewing the BZX84C5V6LT1 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (5.6 V), tolerance (±5%), thermal resistance (556 °C/W), temperature coefficient (−2.0 mV/°C), and ESD rating (>16 kV HBM).

Technical Context

This device operates in reverse-biased breakdown mode to maintain stable voltage across its cathode-anode terminals under varying load or input conditions. Its 5.6 V nominal Zener voltage is specified at 5 mA test current (IZT), with tight regulation enabled by low dynamic impedance (40 Ω) and minimal temperature drift (−2.0 mV/°C).

The SOT-23 package features three terminals: anode (Pin 1), no connection (Pin 2), and cathode (Pin 3), enabling compact placement in space-constrained PCB layouts. It supports automated assembly and meets UL 94 V-0 flammability rating with Pb-free (G-suffix) variants available.

Key Specifications

Pinout & Package

SOT-23 surface-mount plastic package (Case 318, Style 8), void-free thermosetting material, corrosion-resistant finish, UL 94 V-0 rated, max soldering temperature 260°C for 10 seconds. Cathode indicated by polarity band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84C5V6LT1, BZX84C5V6LT3 provides identical performance in larger reels for production efficiency, while BZX84B5V6LT1 trades wider tolerance for tighter initial accuracy-making it suitable only when ±1% absolute voltage stability is mandatory and cost sensitivity is secondary.

Availability

BZX84C5V6LT1 is available at Aetrix Electronics and suitable for mobile power management, USB peripheral protection, and industrial sensor signal conditioning requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for BZX84C5V6LT1 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

The BZX84CxxxLT1 series is part of onsemi's broad portfolio of discrete Zener regulators designed specifically for space-constrained, low-power voltage reference and transient suppression in portable and high-density electronics.

FAQ

What is the maximum power dissipation of the BZX84C5V6LT1 at 25°C?

The BZX84C5V6LT1 has a maximum power dissipation of 225 mW on FR-5 board at 25°C ambient temperature. This rating decreases linearly above 25°C at 1.8 mW/°C, corresponding to a thermal resistance of 556 °C/W. Exceeding this limit risks thermal runaway or permanent degradation of the Zener junction.

Does the BZX84C5V6LT1 have a built-in capacitor or require external filtering?

The BZX84C5V6LT1 does not include any integrated capacitor; its 200 pF capacitance is inherent parasitic junction capacitance measured at 0 V bias and 1 MHz. For noise-sensitive applications, designers must add external ceramic capacitors (e.g., 100 nF X7R) in parallel to improve high-frequency bypassing-especially when used as a reference for precision ADCs or op-amps.

Can the BZX84C5V6LT1 be used as a replacement for the BZX84C5V1LT1 in a circuit?

The BZX84C5V6LT1 is not a direct functional replacement for the BZX84C5V1LT1 due to differing nominal Zener voltages (5.6 V vs. 5.1 V) and distinct voltage tolerances (±5% vs. ±5%, but centered at different values). Substituting them may cause overvoltage stress on downstream components or insufficient clamping margin-always verify circuit operating points before interchange.

What is the significance of Pin 2 being labeled "No Connection" on the BZX84C5V6LT1?

Pin 2 on the BZX84C5V6LT1 is internally unconnected and must remain electrically floating on the PCB. Routing a trace to this pin, tying it to ground or supply, or including it in copper pour violates the device's mechanical construction and can cause unpredictable leakage paths, thermal imbalance, or solder joint reliability issues during reflow.

How does the temperature coefficient of −2.0 mV/°C affect BZX84C5V6LT1 performance in real-world designs?

The −2.0 mV/°C temperature coefficient means the BZX84C5V6LT1's Zener voltage decreases by approximately 2 mV for every 1°C rise in junction temperature. In a 50°C ambient-to-junction swing, this yields ~100 mV total drift-acceptable for non-critical clamping but requiring compensation (e.g., series resistor or dual-Zener configuration) in precision reference applications.