Nexperia USA Inc. BAS40-05,235

Overview

BAS40-05,235 from Nexperia is a general-purpose dual Schottky diode in SOT23 package, featuring common-cathode configuration for ultra-high-speed switching and voltage clamping. It delivers 380 mV forward voltage at 1 mA, 40 V reverse voltage rating, and 5 pF diode capacitance at 0 V - enabling compact, low-loss signal path protection in space-constrained DC-DC and RF front-end designs.

For engineers reviewing the BAS40-05,235 datasheet, BAS40-05,235 pinout, BAS40-05,235 application, or BAS40-05,235 equivalent, key selection criteria include its dual-anode/common-cathode topology, pulsed forward current capability up to 120 mA, thermal resistance of 500 K/W, and suitability for high-frequency clamping where low VF and low Cd are critical.

Technical Context

The BAS40-05,235 integrates two independent Schottky diodes sharing a single cathode terminal (Pin 3), forming a matched pair optimized for synchronous clamping and rail-to-rail signal steering. Its junction temperature rating of 150 °C and ambient operating range from –65 °C to +150 °C support deployment in industrial and automotive-adjacent environments with minimal derating.

Designed for pulsed operation (tp ≤ 300 µs, duty cycle ≤ 0.02), it exhibits stable VF across IF = 1–40 mA (380–1000 mV) and IR < 10 µA at VR = 40 V, while maintaining Cd ≤ 5 pF at 1 MHz - confirming suitability for >100 MHz signal integrity applications requiring fast recovery and minimal parasitic loading.

Key Specifications

Pinout & Package

Package: SOT23 (TO-236AB), 3-terminal surface-mount plastic package, 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual Schottky diode applications.

Compared with NSR20F40NXT5G and BAV99,215, the BAS40-05,235 uniquely balances low VF, low Cd, and true common-cathode topology - making it optimal for compact, high-frequency clamping where signal fidelity and layout simplicity are prioritized over extreme current handling or ultra-high VR.

Availability

BAS40-05,235 is available at Aetrix Electronics and suitable for USB interface protection, DC-DC feedback clamping, RF detector circuits, and logic-level signal steering requiring stable component supply and guaranteed long-term sourcing.

Supply support for BAS40-05,235 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 semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with leadership in Schottky diodes, MOSFETs, and ESD protection solutions.

The BAS40-05,235 belongs to Nexperia's general-purpose Schottky diode series, engineered for cost-effective, high-speed signal conditioning in consumer, industrial, and communications equipment where low VF and low Cd are design-critical.

FAQ

Is BAS40-05,235 suitable for automotive applications?

No. The BAS40-05,235 is explicitly marked as non-automotive qualified in its revision history (v.12, Jan 2023). It lacks AEC-Q101 qualification, automotive-grade screening, and extended reliability testing. For automotive use, Nexperia offers the BAS40-05Q variant - which undergoes full AEC-Q101 stress testing and operates across –40 °C to +150 °C with enhanced lot traceability.

What is the maximum allowable power dissipation for BAS40-05,235 on a standard FR4 PCB?

Based on Rth(j-a) = 500 K/W and Tj(max) = 150 °C, the maximum steady-state power dissipation is 250 mW when Tamb = 25 °C (ΔT = 125 K). At Tamb = 85 °C, safe dissipation drops to 130 mW. Pulsed operation (≤300 µs, ≤2% duty cycle) allows brief excursions beyond this limit without exceeding junction temperature limits.

Can BAS40-05,235 be used as a replacement for a single Schottky diode?

Yes - either anode (Pin 1 or Pin 2) can be used independently with the common cathode (Pin 3) as the return path, effectively functioning as a single Schottky diode. However, unused anode must be left unconnected or tied to a non-interfering potential; floating anodes do not induce leakage or instability due to the device's intrinsic isolation.

Does BAS40-05,235 support reflow soldering per JEDEC J-STD-020?

Yes. Nexperia specifies compatibility with standard Pb-free reflow profiles (peak temperature ≤ 260 °C, time above liquidus ≤ 60 s). The SOT23 package outline and solder land recommendations (Fig. 6) align with JEDEC J-STD-020E, and thermal characteristics confirm robustness under repeated thermal cycling when mounted per recommended footprint and stencil design.