Nexperia USA Inc. BZA456A,165

Overview

BZA456A from Nexperia is a quadruple ESD transient voltage suppressor diode in SOT457 (SC-74) package, configured as four cathodes sharing a common anode. It provides 5.6 V working voltage (V_Z = 5.32–5.88 V at I_Z = 1 mA), clamps to ≤8 V at 3 A peak pulse current, and delivers 24 W non-repetitive peak reverse power dissipation for high-energy ESD protection in 4-line data interfaces.

For engineers reviewing the BZA456A datasheet, BZA456A pinout, BZA456A application, or BZA456A equivalent, key selection criteria include common-anode quad-channel layout, 140–240 pF capacitance at 3 V/0 V bias, <1.3 V forward voltage at 200 mA, 8 kV IEC 61000-4-2 ESD rating, and thermal resistance of 125 K/W junction-to-soldering-point.

Technical Context

The BZA456A integrates four monolithic Zener-based TVS diodes in a single SOT457 package with shared anode terminals (pins 2 and 5), enabling compact 4-line bidirectional ESD suppression on I/O buses. Its non-clamping range spans −0.5 V to 5.6 V, allowing safe operation below clamping threshold during normal signal swing.

Clamping action initiates above 5.6 V with differential resistance of 400 Ω at 1 mA and 1600 Ω at 250 µA, ensuring low dynamic impedance during transients. Diode capacitance drops from 240 pF (0 V) to 140 pF (3 V), minimizing signal distortion on high-speed lines such as USB 1.1 or parallel control buses.

Key Specifications

Pinout & Package

SOT457 (SC-74) surface-mount package: 6-pin plastic body, 1.1 mm height, 3.1 × 2.7 mm footprint, 0.95 mm lead pitch. Designed for reflow soldering with exposed soldering points at pins 2 and 5 (common anodes).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ESDA6V1SC6 and TPD4E05U06, the BZA456A offers higher peak power (24 W), broader non-clamping range (−0.5 to 5.6 V), and proven suitability for 5 V logic-level interfaces-making it optimal for cost-sensitive industrial and computing applications where moderate capacitance is acceptable.

Availability

BZA456A is available at Aetrix Electronics and suitable for computers and peripherals, audio and video equipment, and communication systems requiring stable component supply and long-term production continuity.

Supply support for BZA456A 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

Nexperia is a global leader in high-volume production of discrete semiconductors, specializing in automotive-grade reliability and industrial robustness for mass-market electronics.

The BZA456A belongs to Nexperia's ESD protection portfolio designed specifically for multi-line interface hardening in cost-sensitive computing and consumer applications, emphasizing ease of layout and compatibility with legacy 5 V systems.

FAQ

What is the maximum allowable soldering temperature for BZA456A?

The BZA456A is qualified for standard lead-free reflow profiles with peak temperature up to 260 °C for 10 seconds, consistent with IPC/JEDEC J-STD-020. Its SOT457 package uses thermally robust epoxy molding compound rated for continuous operation up to 150 °C junction temperature, and thermal resistance of 125 K/W ensures safe heat transfer during reflow if PCB copper area meets minimum pad recommendations.

Can BZA456A protect both positive and negative ESD transients?

Yes-the BZA456A operates bidirectionally due to its common-anode configuration with four cathodes. During positive transients, current flows from cathode to common anode; during negative transients, the diode junctions conduct in forward bias from anode to cathode, clamping voltages to ≤1.3 V in forward direction and ≤8 V in reverse. This dual-mode behavior satisfies IEC 61000-4-2 ±8 kV contact discharge requirements.

How does the dual common-anode pin (pins 2 and 5) improve performance?

Pins 2 and 5 provide redundant low-inductance paths to ground, reducing total series inductance in the ESD return path. Layout guidelines specify connecting both pins directly to the same ground plane region using short, wide traces-this minimizes voltage overshoot (V = L·di/dt) during fast-rising ESD events. Dual anodes also improve current sharing and thermal distribution, supporting the full 24 W peak power rating without localized heating.

Is BZA456A suitable for protecting RS-232 lines?

No-RS-232 signals swing beyond ±5 V (up to ±15 V), exceeding the BZA456A's 5.6 V working voltage and non-clamping range (−0.5 to +5.6 V). Applying RS-232 voltage levels would cause continuous conduction and thermal failure. For RS-232, use dedicated high-voltage TVS arrays like PESD5V0S1BA or SP1003, which feature ±15 V standoff and ±30 kV ESD rating.