Nexperia USA Inc. BAS70W,115

Overview

BAS70W from Nexperia is a general-purpose Schottky diode in SOT323 (SC-70) package, designed for ultra-high-speed switching and voltage clamping. It delivers 70 V reverse voltage rating, 70 mA forward current capability, 410 mV forward voltage at 1 mA, 2 pF diode capacitance at 0 V, and 100 nA reverse leakage at 50 V - enabling compact, low-loss signal path protection in space-constrained DC-DC converters and logic interface circuits.

For engineers reviewing the BAS70W datasheet, BAS70W pinout, BAS70W application, or BAS70W equivalent, key selection criteria include its low VF/IR trade-off, SC-70 thermal resistance (625 K/W), n.c. terminal isolation, and suitability for pulsed switching in 3.3 V/5 V digital I/O protection, RF detector biasing, and clamp-based transient suppression where minimal stored charge and fast recovery are critical.

Technical Context

The BAS70W employs a planar Schottky barrier structure optimized for low forward voltage and minimal junction capacitance. Its anode-cathode-n.c. terminal configuration isolates unused lead to reduce parasitic coupling in high-frequency layouts, while the SOT323 footprint supports automated placement on dense PCBs with standard reflow profiles.

Thermal performance is defined under JEDEC JESD51-2 conditions: R_th(j-a) = 625 K/W on single-sided FR4, limiting continuous power dissipation to ~160 mW at ambient. The device operates across −65 °C to +150 °C junction temperature, with IR rising to 10 µA at VR = 70 V and Tamb = 25 °C.

Key Specifications

Pinout & Package

SOT323 (SC-70) plastic surface-mount package with 3 leads, 1.3 mm pitch, and standard tin-plated copper footprint per Figure 6 (reflow) and Figure 7 (wave soldering). Dimensions: 2.0 mm × 1.25 mm × 0.95 mm body height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5711 and RB521S-30T2R, the BAS70W uniquely balances 70 V VR, 2 pF Cd, and SOT323 manufacturability - making it optimal for 24–48 V industrial clamping and RF-sensitive applications where both voltage headroom and high-frequency performance are non-negotiable.

Availability

BAS70W is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and portable medical instrumentation requiring stable component supply and long-term SMT process compatibility.

Supply support for BAS70W 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 automotive-qualified and industrial-grade components.

The BAS70W belongs to Nexperia's general-purpose Schottky diode product line, engineered for cost-effective, high-speed switching in consumer, industrial, and communications equipment where low VF, low Cd, and robust thermal behavior are essential.

FAQ

Is the BAS70W suitable for automotive applications?

No - the BAS70W is not AEC-Q200 qualified or tested for automotive use. Nexperia explicitly states in its legal disclaimers that non-automotive-qualified products like the BAS70W are unsuitable for safety-critical or life-support systems. For automotive designs, select AEC-Q200-compliant alternatives such as the PMEG3010CPA or BAS70-04W.

What is the meaning of the 'n.c.' pin in the BAS70W pinout?

Pin 2 is internally not connected - it serves no electrical function and must remain unbonded and unconnected on the PCB. This design reduces parasitic capacitance and improves high-frequency isolation, especially critical in RF detector and high-speed data line applications where stray coupling could degrade performance.

Can the BAS70W replace a 1N4148 in high-speed switching circuits?

Yes, but only where low forward voltage and fast recovery are prioritized over high reverse voltage tolerance. The BAS70W offers lower VF (410 mV vs. 715 mV) and faster switching than the 1N4148, but its 70 V VR is lower than the 1N4148's 100 V rating. Use BAS70W in ≤48 V systems needing minimal conduction loss; retain 1N4148 for ≥75 V applications.

How does the BAS70W's thermal resistance affect PCB layout?

With R_th(j-a) = 625 K/W on standard FR4, the BAS70W dissipates only ~160 mW at 25 °C ambient before reaching 150 °C junction temperature. To maintain reliability, avoid placing it near heat sources, use minimum 1 mm² copper pour under the pad, and ensure airflow if ambient exceeds 50 °C - otherwise, derate IF to ≤35 mA at 70 °C ambient.