Diodes Incorporated BAS19-7-F

Overview

BAS19-7-F from Diodes Incorporated is a surface-mount fast-switching general-purpose silicon switching diode in SOT23 package, rated for 120 V repetitive peak reverse voltage (V_RRM), 400 mA forward continuous current (I_FM), and 50 ns reverse recovery time (t_rr). It delivers high conductance and low forward voltage drop (1.25 V at 200 mA), suited for signal routing and voltage clamping in consumer power supplies and logic interface circuits.

For engineers reviewing the BAS19-7-F datasheet, BAS19-7-F pinout, BAS19-7-F application, or BAS19-7-F equivalent, key selection criteria include its 120 V V_RRM, 50 ns t_rr, SOT23 footprint compatibility, thermal resistance of 500 °C/W, and RoHS-compliant lead-free plating - all critical for high-density PCB layouts requiring reliable transient response and automated assembly.

Technical Context

The BAS19-7-F employs a planar epitaxial silicon PN junction optimized for fast recovery and low leakage. Its 50 ns reverse recovery time enables operation in switching frequencies up to several MHz in clamp, protection, and signal steering roles.

Rated for -55 °C to +150 °C operating temperature and 250 mW power dissipation on FR-4 with 2 oz copper, it maintains stable conduction under transient load conditions while supporting thermal derating per Figure 1 in the datasheet.

Key Specifications

Pinout & Package

Package: SOT23 - surface-mount plastic package with 3 terminals, UL 94V-0 rated, moisture sensitivity level 1, and matte tin-plated alloy 42 leadframe.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fast-switching diode applications.

Compared with BAS20-7-F, BAS19-7-F offers lower V_RRM but identical thermal and packaging behavior; versus 1N4148W-7-F, it trades ultra-fast recovery for higher voltage capability and tighter leakage control at elevated temperature.

Availability

BAS19-7-F is available at Aetrix Electronics and suitable for USB port protection, microcontroller I/O clamping, DC-DC feedback snubbing, and automotive body control module signal routing requiring stable component supply across industrial and consumer production programs.

Supply support for BAS19-7-F 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.

The BAS19/BAS20/BAS21 series belongs to Diodes' general-purpose switching diode product line, engineered for cost-sensitive, high-volume applications demanding consistent fast recovery, low leakage, and automated assembly compatibility.

FAQ

What is the maximum junction temperature for BAS19-7-F?

The BAS19-7-F has a specified operating junction temperature range of -55 °C to +150 °C. This allows reliable operation in sealed enclosures, near power stages, or under extended ambient conditions common in automotive and industrial environments. Thermal derating begins above 25 °C ambient per the 500 °C/W R_θJA curve in Figure 1 of DS12004.

Is BAS19-7-F suitable for automotive applications?

The standard BAS19-7-F is not AEC-Q101 qualified. For automotive use, Diodes offers the BAS20Q and BAS21Q variants, which are AEC-Q101 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. BAS19-7-F may be used in non-safety-critical cabin modules only if customer qualification is performed independently.

How does the SOT23 pinout of BAS19-7-F differ from TO-92 diodes?

BAS19-7-F uses a three-terminal SOT23 package where Pin 1 is anode, Pin 2 is cathode, and Pin 3 is NC - unlike TO-92 diodes that use two leads and no NC terminal. The SOT23 orientation follows standard top-view marking (e.g., "KA8" or "KT3"), and Pin 3 must remain unconnected in PCB layout to avoid unintended parasitic coupling.

Can BAS19-7-F replace 1N4148 in existing designs?

BAS19-7-F shares the SOT23 footprint and basic switching function with 1N4148W-7-F but differs in key parameters: it offers higher V_RRM (120 V vs. 100 V) and slower t_rr (50 ns vs. 4 ns). It is a viable replacement where voltage margin is prioritized over ultra-fast edge handling, provided layout thermal design accommodates identical 250 mW P_D and 500 °C/W R_θJA.