BAS19 Equivalent & Substitute Parts

Part Overview

The BAS19 is a general-purpose rectifier diode manufactured by onsemi, rated for 120 V DC reverse voltage and 200 mA average rectified current in a surface mount SOT-23-3 package. The device is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and production continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer comparable performance with variations in voltage rating, current capacity, or manufacturer qualification.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	120	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1.25 @ 200 mA	V
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	100 nA @ 100 V	nA
Capacitance @ Vr, F	5 @ 0V, 1MHz	pF
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BAS19 is determined by the following critical parameters: reverse voltage rating (Vr), average rectified current (Io), forward voltage drop (Vf), reverse recovery time (trr), and physical package compatibility. Parts are grouped into three categories:

Direct Equivalents maintain all electrical specifications (120 V, 200 mA) and identical package form factor. These parts are interchangeable without circuit modification.

Parametric Equivalents maintain all electrical specifications but may originate from different manufacturers or product lines within the same base family.

Upgrade/Similar Parts feature reduced reverse voltage ratings (100 V) or increased current capacity (250 mA) while maintaining the same package footprint and forward voltage characteristics. These parts are suitable for applications where the original voltage specification exceeds circuit requirements.

The following parameters must remain constant or improve for substitution validity: forward voltage drop (Vf), reverse recovery time (trr), reverse leakage current, and capacitance. Reverse voltage may be equal or higher; current capacity may be equal or higher.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V]	trr [ns]	Package	Product Status	Grade
BAS19	onsemi	120	200	1.25 @ 200 mA	50	SOT-23-3	Obsolete	Standard
BAS19LT1G	onsemi	120	200	1.25 @ 200 mA	50	SOT-23-3	Active	Standard
BAS19LT3G	onsemi	120	200	1.25 @ 200 mA	50	SOT-23-3	Active	Standard
NSVBAS19LT1G	onsemi	120	200	1.25 @ 200 mA	50	SOT-23-3	Active	Standard
BAS19,215	Nexperia USA Inc.	100	200	1.25 @ 200 mA	50	TO-236AB	Active	Automotive (AEC-Q100)
BAS19,235	Nexperia USA Inc.	100	200	1.25 @ 200 mA	50	TO-236AB	Active	Automotive (AEC-Q100)
BAS19-7-F	Diodes Incorporated	100	200	1.25 @ 200 mA	50	SOT-23-3	Active	Standard
BAS19-E3-08	Vishay General Semiconductor - Diodes Division	100	200	1.25 @ 200 mA	50	SOT-23-3	Active	Standard
BAS19-TP	Micro Commercial Co	100	200	1.25 @ 200 mA	50	SOT-23-3	Active	Standard
BAS21E6327HTSA1	Infineon Technologies	200	250	1.25 @ 200 mA	50	SOT-23-3	Last Time Buy	Standard

Engineering Selection Recommendations

Direct Replacement (No Circuit Modification Required):

BAS19LT1G, BAS19LT3G, and NSVBAS19LT1G are direct electrical and mechanical equivalents manufactured by onsemi. All three parts maintain the 120 V reverse voltage rating, 200 mA current capacity, and identical electrical characteristics. BAS19LT1G and BAS19LT3G are available in higher quantities and carry active product status. NSVBAS19LT1G represents an alternative product line variant with equivalent specifications. These parts are suitable for direct substitution in existing designs without PCB or schematic modification.

Automotive-Grade Upgrade:

BAS19,215 and BAS19,235 (Nexperia USA Inc.) are automotive-qualified alternatives carrying AEC-Q100 certification. These parts feature a reduced reverse voltage rating of 100 V, which is acceptable for applications where the circuit operates below this threshold. The automotive grade qualification provides enhanced reliability documentation and traceability suitable for automotive and industrial applications. Both parts are manufactured in TO-236AB package form factor, mechanically compatible with SOT-23-3 footprints.

Standard-Grade Alternatives (100 V Rating):

BAS19-7-F (Diodes Incorporated), BAS19-E3-08 (Vishay General Semiconductor), and BAS19-TP (Micro Commercial Co) are functionally equivalent parts with 100 V reverse voltage ratings. These parts maintain identical forward voltage, reverse recovery time, and current capacity specifications. Selection among these alternatives depends on supply chain availability and preferred manufacturer qualification. All three carry active product status.

Higher-Voltage, Higher-Current Alternative:

BAS21E6327HTSA1 (Infineon Technologies) provides enhanced specifications with 200 V reverse voltage and 250 mA current capacity. This part is suitable for applications requiring higher voltage or current margins. The part carries Last Time Buy status, indicating limited future availability. Use this part only when enhanced specifications are required for circuit performance or reliability margins.

Frequently Asked Questions (FAQ)

Q: Can BAS19LT1G directly replace the obsolete BAS19 without any circuit changes?

A: Yes. BAS19LT1G is a direct electrical and mechanical equivalent with identical voltage rating (120 V), current capacity (200 mA), forward voltage drop (1.25 V @ 200 mA), and package form factor (SOT-23-3). No circuit modification is required.

Q: What is the difference between BAS19LT1G and BAS19LT3G?

A: Both parts are electrically and mechanically identical. The difference lies in the product line designation and manufacturing batch traceability. Both are active onsemi products suitable for direct substitution.

Q: Can I use BAS19,215 or BAS19,235 in place of BAS19?

A: These parts are suitable substitutes if your circuit operates at reverse voltages of 100 V or below. Both parts maintain identical current capacity (200 mA) and forward voltage characteristics (1.25 V @ 200 mA). The primary difference is the reduced reverse voltage rating (100 V vs. 120 V) and automotive-grade qualification. If your circuit requires the full 120 V rating, these parts are not appropriate.

Q: What does AEC-Q100 certification mean for BAS19,215 and BAS19,235?

A: AEC-Q100 is an automotive industry qualification standard that certifies component reliability under automotive operating conditions. Parts carrying this certification undergo enhanced testing and documentation requirements. These parts are suitable for automotive, industrial, and mission-critical applications requiring higher reliability assurance.

Q: Are the 100 V rated alternatives (BAS19-7-F, BAS19-E3-08, BAS19-TP) interchangeable with each other?

A: Yes, these three parts are electrically and mechanically interchangeable. All maintain 100 V reverse voltage, 200 mA current capacity, 1.25 V forward voltage drop, and SOT-23-3 package form factor. Selection depends on supply chain availability and preferred manufacturer.

Q: When should I use BAS21E6327HTSA1 instead of BAS19 equivalents?

A: Use BAS21E6327HTSA1 only when your circuit requires higher reverse voltage (200 V) or higher current capacity (250 mA) than the BAS19 specifications. This part carries Last Time Buy status, indicating limited future availability. Verify long-term supply requirements before selecting this alternative.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All parts listed in this reference maintain ROHS3 compliance and are suitable for applications requiring lead-free and restricted substance compliance.

Q: What is the difference between SOT-23-3 and TO-236AB packages?

A: SOT-23-3 and TO-236AB are equivalent package designations for the same physical form factor. Both refer to a three-lead surface mount package with identical pin spacing and footprint. Parts specified as either designation are mechanically interchangeable on standard PCB layouts.

Q: Can I substitute parts with different operating temperature ranges?

A: Operating temperature range differences do not affect substitution validity if the part's maximum junction temperature meets or exceeds your circuit's thermal requirements. BAS19 specifies -55°C to 150°C; most alternatives maintain this range or extend it. Verify your application's thermal operating envelope before selection.

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