Nexperia USA Inc. BZA956A,115

Overview

BZA956A,115 from Nexperia is a quadruple ESD transient voltage suppressor diode in SOT665 package with common anode configuration, 5.6 V nominal working voltage (V_Z), <1.3 V forward voltage at 200 mA, and 16 W non-repetitive peak reverse power dissipation. It delivers >8 kV ESD protection per IEC61000-4-2 and is used for I/O line protection in computer peripherals.

For engineers reviewing the BZA956A,115 datasheet, BZA956A,115 pinout, BZA956A,115 application, or BZA956A,115 equivalent, key selection criteria include clamping performance under ±1 kV ESD pulses, low diode capacitance (2.2 pF at 0 V), thermal resistance (125 K/W for all diodes loaded), and compatibility with high-speed data lines requiring minimal signal distortion.

Technical Context

The BZA956A,115 integrates four Zener-type ESD protection diodes sharing a common anode (Pin 2), enabling compact 4-line I/O protection. Each diode exhibits a typical differential resistance of 400 Ω at 1 mA and temperature coefficient of +0.3 mV/K, ensuring stable clamping across operating temperatures.

Its SOT665 package supports surface-mount assembly with five leads arranged linearly (Pin 1–5), optimized for low-inductance PCB layout. Clamping behavior is validated per IEC61000-4-2 using 150 pF/330 Ω network, with measured clamped waveforms showing sub-12 V peak suppression at ±1 kV contact discharge.

Key Specifications

Pinout & Package

SOT665 is a 5-lead surface-mount plastic package with gull-wing leads, 1.7 mm × 1.3 mm body size, and 0.5 mm pitch. Pin 2 serves as the common anode; Pins 1, 3, 4, and 5 are individual cathodes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ESDA6V1-5W5 and TPD4E001DQAR, BZA956A,115 offers optimal balance of low capacitance (2.2 pF), proven 8 kV+ ESD margin, and SOT665 manufacturability-making it preferred for cost-sensitive, medium-speed industrial and peripheral designs.

Availability

BZA956A,115 is available at Aetrix Electronics and suitable for USB peripheral protection, audio interface ESD guard, and industrial HMI keypad applications requiring stable component supply and long-term obsolescence management.

Supply support for BZA956A,115 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 discrete, logic, and PowerMOS semiconductors, formed in 2017 from the former NXP Standard Products business, with focus on automotive, industrial, computing, consumer, and wearable markets.

The BZA900A-series belongs to Nexperia's ESD protection portfolio, engineered specifically for compact, high-density I/O line protection in space-constrained consumer and industrial electronics.

FAQ

What is the maximum clamping voltage of BZA956A,115 under IEC61000-4-2 ±1 kV contact discharge?

Per Figure 6 in the datasheet, the clamped ±1 kV ESD waveform peaks at approximately 11.5 V for BZA956A,115 when tested with the standard 150 pF/330 Ω network. This value reflects worst-case clamping under fast-rising transients and assumes optimal PCB layout with minimal series inductance.

Can BZA956A,115 be used for bidirectional signal lines like USB D+ and D−?

Yes - its common-anode configuration allows each cathode to clamp positive transients to ground and conduct negative transients through the internal Zener junction. This enables true bidirectional protection on data lines without polarity restrictions, confirmed by IEC61000-4-2 testing on both polarities.

How does thermal derating affect BZA956A,115 when all four diodes clamp simultaneously?

Figure 5 shows total power derating begins at 25 °C ambient, dropping to ~200 mW at 85 °C. With R_{th j-s} = 125 K/W for all diodes loaded, simultaneous clamping of four 1 ms pulses at rated P_ZSM requires careful thermal design - recommended practice is to limit duty cycle or add local copper pour under Pin 2.

Is the SOT665 package compatible with standard reflow profiles for lead-free assembly?

Yes - Nexperia qualifies SOT665 for JEDEC J-STD-020D-compliant lead-free reflow, with peak temperature up to 260 °C for 30 seconds. The package's plastic body and gull-wing leads withstand thermal cycling without delamination or solder joint fracture when using IPC-A-610 Class 2 process controls.