BAS19W Equivalent & Substitute Parts

Part Overview

The BAS19W is an active, surface-mount switching diode manufactured by Taiwan Semiconductor Corporation. It is specified for 100V reverse voltage operation with 200mA average rectified current in a compact SOT-323 package. This component is used in general-purpose switching and signal applications requiring small-signal rectification performance.

Equivalent and substitute parts are identified based on matching or exceeding the electrical and mechanical specifications of the BAS19W, ensuring functional compatibility in circuit applications while maintaining package form factor and thermal performance requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1.25 @ 100 mA	V
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	100	nA @ 100 V
Capacitance @ Vr, F	5	pF @ 0V, 1MHz
Package / Case	SC-70, SOT-323	—
Operating Temperature - Junction (Max)	125	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BAS19W is determined by the following critical parameters:

Reverse Voltage Rating (Vr): Substitute parts must equal or exceed 100V to maintain voltage withstand capability.
Average Rectified Current (Io): Substitute parts must equal or exceed 200mA to support the same or higher current loads.
Package Form Factor: Substitute parts must use SC-70 or SOT-323 package to ensure mechanical and thermal compatibility with existing PCB layouts.
Forward Voltage (Vf): Substitute parts must not exceed 1.25V at the specified test current to maintain circuit performance.
Reverse Recovery Time (trr): Substitute parts must support small-signal switching applications with recovery times consistent with the original specification.

The BAS16WF from Nexperia USA Inc. meets these substitution criteria and is identified as a direct equivalent for the BAS19W.

Parameter Comparison

Parameter	BAS19W (Taiwan Semiconductor)	BAS16WF (Nexperia USA Inc.)	Match Status
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	Equal
Current - Average Rectified (Io)	200 mA	175 mA	Substitute rated lower
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 100 mA	1.25 V @ 150 mA	Equal
Reverse Recovery Time (trr)	50 ns	4 ns	Substitute superior
Current - Reverse Leakage @ Vr	100 nA @ 100 V	500 nA @ 80 V	Substitute higher leakage
Capacitance @ Vr, F	5 pF @ 0V, 1MHz	1.5 pF @ 0V, 1MHz	Substitute lower
Package / Case	SC-70, SOT-323	SC-70, SOT-323	Equal
Operating Temperature - Junction (Max)	125 °C	150 °C	Substitute superior
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equal

Engineering Selection Recommendations

BAS16WF Substitution Suitability

The BAS16WF is suitable as a substitute for the BAS19W in applications where the following conditions are met:

Current Requirement: Circuit design must accommodate the BAS16WF's 175mA average rectified current rating. Applications requiring the full 200mA capacity of the BAS19W must verify that 175mA is sufficient for the intended load.
Reverse Leakage: The BAS16WF exhibits higher reverse leakage current (500nA @ 80V) compared to the BAS19W (100nA @ 100V). Applications sensitive to leakage current in high-impedance circuits must evaluate this parameter against design tolerances.
Compliance and Qualification: Both parts are ROHS3 compliant and REACH unaffected. The BAS16WF carries AEC-Q101 automotive qualification, providing additional reliability assurance for demanding applications.
Thermal Performance: The BAS16WF supports a maximum junction temperature of 150°C, exceeding the BAS19W specification of 125°C, allowing operation in higher-temperature environments.
Switching Performance: The BAS16WF demonstrates superior reverse recovery time (4ns versus 50ns), enabling faster switching transitions in high-frequency applications.

Frequently Asked Questions (FAQ)

Q: Can the BAS16WF directly replace the BAS19W in all applications?

A: The BAS16WF is mechanically and electrically compatible with the BAS19W in most applications. However, circuit designs operating at or near the 200mA current limit must verify that the BAS16WF's 175mA rating is acceptable. Additionally, applications with strict leakage current requirements should evaluate the higher reverse leakage specification of the BAS16WF.

Q: Are the package dimensions identical between BAS19W and BAS16WF?

A: Both parts use the SC-70 SOT-323 package, ensuring identical PCB footprint and mounting compatibility. No layout modifications are required for mechanical substitution.

Q: What is the significance of the reverse recovery time difference?

A: The BAS16WF's reverse recovery time of 4ns is significantly faster than the BAS19W's 50ns. This superior performance benefits high-frequency switching applications by reducing switching losses and improving circuit efficiency. In low-frequency applications, this difference has minimal impact.

Q: Does the BAS16WF's higher operating temperature rating affect substitution decisions?

A: The BAS16WF's 150°C maximum junction temperature provides additional thermal margin compared to the BAS19W's 125°C rating. This allows operation in higher-ambient-temperature environments without derating. For applications within the BAS19W's thermal envelope, this difference is not a limiting factor.

Q: How does the capacitance difference impact circuit performance?

A: The BAS16WF exhibits lower junction capacitance (1.5pF versus 5pF), which reduces parasitic effects in high-frequency circuits and improves switching speed. For low-frequency applications, this difference is negligible.

Q: Are both parts available in the same packaging format?

A: Yes. Both the BAS19W and BAS16WF are supplied in Tape & Reel (TR) packaging in the SOT-323 form factor, ensuring compatibility with automated assembly processes.

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