BAV19 Equivalent & Substitute Parts

Part Overview

The BAV19 is a small signal rectifier diode manufactured by onsemi in DO-35 (DO-204AH) axial package configuration. This component is rated for 120 V DC reverse voltage with 200 mA average rectified current and features a 50 ns reverse recovery time. The BAV19 is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity.

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 V @ 200 mA	V
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	100 nA @ 100 V	nA
Capacitance @ Vr, F	5	pF @ 0V, 1MHz
Operating Temperature - Junction (Max)	175	°C
Package / Case	DO-204AH, DO-35, Axial	—
Mounting Type	Through Hole	—
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed	—

Substitute Part Grouping Explanation

Substitution of the BAV19 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 100 V minimum; 120 V preferred for full compatibility
Current - Average Rectified (Io): 200 mA minimum
Package / Case: DO-204AH, DO-35, Axial (through-hole configuration)
Mounting Type: Through Hole
Operating Temperature - Junction: 175°C maximum

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: 1.25 V @ 200 mA or lower
Reverse Recovery Time (trr): 50 ns or faster
Current - Reverse Leakage @ Vr: 100 nA @ 100 V or lower
Capacitance @ Vr, F: 5 pF @ 0V, 1MHz or lower

Parts meeting all primary criteria are classified as direct substitutes. Parts meeting primary criteria with variations in secondary parameters are classified as parametric equivalents.

Parameter Comparison

Parameter	BAV19 (onsemi)	BAV19 A0G (TSC)	BAV19-TAP (Vishay)	BAV19TR (Fairchild)
Voltage - DC Reverse (Vr) (Max)	120 V	100 V	100 V	120 V
Current - Average Rectified (Io)	200 mA	200 mA	250 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 200 mA	1.25 V @ 200 mA	1 V @ 100 mA	1.25 V @ 200 mA
Reverse Recovery Time (trr)	50 ns	—	50 ns	50 ns
Current - Reverse Leakage @ Vr	100 nA @ 100 V	100 nA @ 100 V	100 nA @ 100 V	100 nA @ 100 V
Capacitance @ Vr, F	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	1.5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz
Operating Temperature - Junction (Max)	175°C	175°C	175°C	175°C
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	—

Engineering Selection Recommendations

BAV19TR (Fairchild Semiconductor) - Primary Substitute

The BAV19TR is the optimal substitute for the obsolete BAV19. This part maintains identical electrical specifications across all critical parameters: 120 V DC reverse voltage, 200 mA average rectified current, 1.25 V forward voltage at 200 mA, and 50 ns reverse recovery time. The BAV19TR is currently in active production status with 10,400 pieces in stock, ensuring procurement reliability. Both parts share identical package configuration (DO-204AH, DO-35, Axial) and operating temperature rating (175°C maximum junction temperature). The BAV19TR is supplied in bulk packaging.

BAV19-TAP (Vishay General Semiconductor - Diodes Division) - Secondary Substitute

The BAV19-TAP is a parametric equivalent suitable for applications where increased current capacity is acceptable. This part is rated for 250 mA average rectified current compared to the BAV19's 200 mA specification, providing design margin. The BAV19-TAP operates at 100 V DC reverse voltage, which is 20 V lower than the BAV19 specification. This part features improved forward voltage characteristics (1 V @ 100 mA) and lower capacitance (1.5 pF @ 0V, 1MHz). The BAV19-TAP holds AEC-Q101 automotive qualification and ROHS3 compliance. This part is supplied in Tape & Box packaging with 840 pieces in stock.

BAV19 A0G (Taiwan Semiconductor Corporation) - Tertiary Substitute

The BAV19 A0G is a general-purpose rectifier diode suitable for applications where 100 V reverse voltage rating is sufficient. This part maintains 200 mA average rectified current and identical forward voltage characteristics (1.25 V @ 200 mA). The BAV19 A0G is currently in active production with ROHS3 compliance and 775 pieces in stock. This part is recommended only when the 20 V voltage margin difference between the BAV19 and BAV19 A0G does not impact circuit design requirements.

Frequently Asked Questions (FAQ)

Q: Can the BAV19TR directly replace the obsolete BAV19 without circuit modification?

A: Yes. The BAV19TR maintains identical electrical specifications across all critical parameters: 120 V DC reverse voltage, 200 mA average rectified current, 1.25 V forward voltage at 200 mA, 50 ns reverse recovery time, and 175°C maximum junction temperature. Both parts use the DO-204AH (DO-35) axial through-hole package. No circuit modification is required.

Q: What is the voltage difference between the BAV19 and BAV19 A0G, and does it matter?

A: The BAV19 is rated for 120 V DC reverse voltage, while the BAV19 A0G is rated for 100 V. This 20 V difference represents a 16.7% reduction in reverse voltage rating. Substitution is acceptable only if the circuit design includes sufficient voltage margin and the maximum reverse voltage across the diode does not exceed 100 V under any operating condition, including transient events.

Q: Why does the BAV19-TAP have lower capacitance than the BAV19?

A: The BAV19-TAP is classified as a fast recovery diode (≤ 500 ns, > 200 mA Io) compared to the BAV19's small signal classification. The lower capacitance (1.5 pF versus 5 pF) is a characteristic of fast recovery diode design. This difference does not affect substitution compatibility but may improve high-frequency circuit performance.

Q: Is the BAV19-TAP suitable for applications requiring exactly 200 mA current?

A: Yes. The BAV19-TAP is rated for 250 mA average rectified current, which exceeds the 200 mA requirement. The part operates safely at 200 mA and below. The higher current rating provides design margin without introducing compatibility issues.

Q: What packaging options are available for BAV19 substitutes?

A: All substitute parts (BAV19TR, BAV19-TAP, BAV19 A0G) are supplied in DO-204AH (DO-35) axial through-hole package configuration. Packaging format differs: BAV19TR is supplied in bulk, BAV19-TAP in Tape & Box, and BAV19 A0G in standard inventory. Package selection depends on procurement and assembly requirements, not electrical compatibility.

Q: Are all substitute parts RoHS compliant?

A: The BAV19-TAP and BAV19 A0G are ROHS3 compliant. RoHS status for the BAV19TR is not specified in the provided data. Verify RoHS compliance requirements with the specific application and procurement specifications before final part selection.

Q: Can the BAV19 A0G be used in circuits designed for 120 V reverse voltage operation?

A: The BAV19 A0G is rated for 100 V DC reverse voltage maximum. Use in circuits designed for 120 V reverse voltage operation is not recommended. The 20 V voltage margin reduction increases the risk of diode failure under peak reverse voltage conditions. Select the BAV19TR or BAV19-TAP for applications requiring 120 V reverse voltage rating.

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