Nexperia USA Inc. BAV199W-QX

Overview

BAV199W-QX from Nexperia is a low-leakage, medium-speed switching double diode in SOT323 (SC-70) package, with diodes connected in series. It delivers typ. 3 pA reverse leakage at 75 V, 0.8 µs reverse recovery time, and supports 500 mA repetitive peak forward current - enabling precision biasing and signal routing in automotive sensor interfaces and low-power analog front-ends.

For engineers reviewing the BAV199W-QX datasheet, BAV199W-QX pinout, BAV199W-QX application, or BAV199W-QX equivalent, this dual-series diode is selected for ultra-low leakage requirements in high-impedance nodes, automotive-grade signal conditioning, and space-constrained SMD designs where thermal performance and AEC-Q101 qualification are mandatory.

Technical Context

This double diode integrates two epitaxial silicon junctions in a single SC-70 package with shared terminal (Pin 3 = K1/A2), forming a series-connected path ideal for voltage clamping and bidirectional signal protection. Its 75 V continuous reverse rating and 85 V repetitive peak reverse voltage support robust operation in 12 V/24 V automotive supply domains.

The device's 2 pF capacitance at 0 V and 0.8 µs trr enable use in moderate-frequency (<10 MHz) signal routing and ESD-tolerant input stages, while its 150 °C max junction temperature and AEC-Q101 qualification confirm suitability for under-hood electronics and engine control modules.

Key Specifications

Pinout & Package

SOT323 (SC-70) plastic surface-mounted package: 3-lead, 1.3 mm pitch, 2.0 mm × 1.25 mm × 0.95 mm body. Compact footprint compatible with automated reflow assembly and wave soldering per IPC-7351B.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-leakage dual-diode applications.

Compared with BAV199W-QX, the BAV199W,115 offers identical performance at lower cost but lacks automotive qualification, while the MMBD199LT1G trades 1,600× higher leakage for broader distributor availability - making BAV199W-QX the sole choice for AEC-Q101–compliant, ultra-low-leakage dual-diode functions.

Availability

BAV199W-QX is available at Aetrix Electronics and suitable for automotive sensor interfaces, engine control unit input protection, and smart actuator feedback circuits requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for BAV199W-QX 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 leading Dutch semiconductor manufacturer specializing in high-volume, high-reliability discrete and logic devices, with global manufacturing and R&D centers focused on automotive, industrial, and mobile applications.

The BAV199W-QX belongs to Nexperia's AEC-Q101–qualified low-leakage diode product line, engineered specifically for precision signal integrity and robustness in automotive electronics where leakage-induced offset and thermal stability are critical.

FAQ

What is the maximum continuous forward current for BAV199W-QX at 90 °C solder point temperature?

At a solder point temperature (Tsp) of 90 °C on an FR4 PCB with single-sided copper, the maximum permissible continuous forward current is 110 mA when both diodes are loaded. This value is derived from thermal derating curves in the datasheet and reflects real-world PCB thermal performance, not idealized junction-to-ambient conditions.

Can BAV199W-QX be used in place of a single diode in a circuit?

Yes, but only if the circuit requires series-connected diodes or leverages Pin 3 (K1/A2) as an internal node. The device is not pin-compatible with single-diode packages like SOD-323. Its three-terminal configuration mandates explicit routing for A1–K1/A2–K2, making it unsuitable as a drop-in replacement for standard single diodes.

How does the 3 pA typical leakage compare to industry standards for automotive diodes?

At 3 pA typical reverse current (IR) at 75 V and 25 °C, BAV199W-QX achieves >100× lower leakage than standard automotive switching diodes (e.g., 1N4148 variants averaging 25 nA). This level meets stringent requirements for high-precision voltage references, battery monitoring, and thermistor biasing in modern ECU designs.

Is the SC-70 package of BAV199W-QX compatible with standard reflow profiles?

Yes - the SOT323 package is qualified for lead-free reflow per J-STD-020, with peak temperature up to 260 °C. The recommended footprint (2.65 mm × 2.35 mm solder lands, 0.55 mm paste stencil) is documented in Figure 8 of the datasheet and supports reliable assembly on standard SMT lines without thermal stress concerns.