Nexperia USA Inc. BZA456A,135

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, 8 kV IEC 61000-4-2 ESD rating, and clamps to ≤8 V at 3 A peak pulse current. It is used for bidirectional ESD protection of four low-voltage data lines in USB, keyboard, or parallel I/O interfaces.

For engineers reviewing the BZA456A datasheet, BZA456A pinout, BZA456A application, or BZA456A equivalent, key selection criteria include common-anode quad-diode topology, 24 W peak pulse power handling, 140–240 pF capacitance at 3 V/0 V, 400 Ω differential resistance at 1 mA, and SOT457 footprint compatibility with space-constrained PCB layouts.

Technical Context

The BZA456A integrates four monolithic silicon avalanche diodes in a single common-anode configuration, enabling simultaneous suppression of ESD transients on four independent signal lines. Its non-clamping range spans −0.5 V to +5.6 V, and it delivers stable clamping at ≤8 V up to 3 A I_ZSM with <1 ms pulse width.

Thermal design relies on junction-to-solder-point thermal resistance of 125 K/W and total power dissipation derating from 720 mW at T_s = 60 °C. Diode capacitance varies from 140 pF (VR = 3 V) to 240 pF (VR = 0 V) at 1 MHz, supporting high-speed digital interface protection without excessive signal distortion.

Key Specifications

Pinout & Package

SOT457 (SC-74) is a plastic surface-mounted package with six leads, 1.1 mm height, 3.1 mm × 2.7 mm body, and 0.95 mm lead pitch. Pin 1 is cathode 1; pins 2 and 5 are common anodes; pins 3, 4, and 6 are cathodes 2, 3, and 4 respectively - confirmed by Figure 1 and Pinning table in original datasheet.

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 balanced trade-offs: moderate capacitance for legacy interfaces, robust 24 W pulse handling, and integrated quad topology - making it optimal for cost-sensitive, space-constrained 5 V I/O protection where speed is secondary to reliability.

Availability

BZA456A is available at Aetrix Electronics and suitable for USB peripheral designs, industrial I/O modules, medical diagnostic port interfaces, and legacy computing equipment requiring stable component supply and long-term obsolescence management.

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, acquired from NXP's Standard Products division in 2017. It specializes in automotive-qualified, industrial-grade ESD protection, logic, and power MOSFETs.

The BZA456A belongs to Nexperia's ESD protection portfolio designed specifically for cost-effective, board-level I/O hardening in consumer, computing, and industrial electronics - emphasizing reliability, manufacturability, and compliance with IEC 61000-4-2.

FAQ

What is the maximum continuous forward current rating for BZA456A?

The BZA456A supports up to 100 mA continuous forward current per diode at solder-point temperature (T_s) = 60 °C. This rating assumes proper PCB copper pour and thermal relief design to maintain junction temperature below 150 °C. Exceeding this current risks thermal runaway or permanent parameter shift due to cumulative self-heating.

Can BZA456A be used for bidirectional signal line protection?

Yes - the BZA456A operates bidirectionally across its −0.5 V to +5.6 V non-clamping range. When reverse-biased beyond 5.6 V or forward-biased beyond −0.5 V, it clamps symmetrically, making it suitable for AC-coupled or dual-supply data lines such as RS-232 or audio interfaces without polarity constraints.

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

Pins 2 and 5 are internally connected to the same common anode node. Using both reduces effective series inductance and improves current sharing during fast ESD transients, lowering overall clamping voltage by up to 0.5 V compared to single-anode connection. PCB layout must tie both pins directly to ground with minimal trace length and via count.

Is BZA456A compliant with RoHS and REACH regulations?

Yes - BZA456A is manufactured by Nexperia in RoHS-compliant, lead-free SOT457 packages and conforms to EU REACH SVHC requirements. The device carries Nexperia's standard environmental compliance documentation, including material declarations and substance concentration reports available upon request for qualifying customers.