BAV19 A0G Equivalent & Substitute Parts

Part Overview

The BAV19 A0G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 100 V DC reverse voltage and 200 mA average rectified current in a DO-35 through-hole package. This component is classified as a small-signal diode suitable for standard switching and rectification applications. The part maintains active product status with ROHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are identified based on matching or exceeding the electrical specifications of the BAV19 A0G while maintaining compatible mechanical packaging and thermal operating ranges. Alternative components are necessary to address supply chain availability, manufacturing lead times, or specific application requirements where equivalent performance characteristics are required.

Key Parameters

Parameter	BAV19 A0G	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1.25 @ 200 mA	V
Current - Reverse Leakage @ Vr	100 nA @ 100 V	nA
Capacitance @ Vr, F	5 @ 0V, 1MHz	pF
Operating Temperature - Junction	-55 to 175	°C
Package / Case	DO-204AH, DO-35, Axial	—
Mounting Type	Through Hole	—
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution logic for the BAV19 A0G is based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 100 V
Current - Average Rectified (Io): Must equal or exceed 200 mA
Package / Case: Must be DO-204AH, DO-35, or Axial equivalent
Mounting Type: Must be Through Hole
Speed Classification: Must support Small Signal ≤ 200mA (Io), Any Speed

Secondary Compatibility Factors:

Operating Temperature Range: Must encompass or exceed -55°C to 175°C
Forward Voltage (Vf): Lower values indicate improved performance
Reverse Leakage Current: Lower values indicate improved performance
RoHS Compliance: ROHS3 compliance preferred for regulatory alignment

Parts are grouped into two categories:

Category A - Full Electrical & Thermal Equivalents: Parts meeting or exceeding all primary criteria with operating temperature ranges matching or exceeding the BAV19 A0G specification.

Category B - Electrical Equivalents with Reduced Current Rating: Parts meeting voltage and package requirements but with average rectified current ratings below 200 mA (150 mA). These parts are suitable only for applications where the actual circuit current does not exceed the substitute part's rating.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) [V]	Ir @ Vr [nA/µA]	Trr [ns]	Tj (Min-Max) [°C]	Package	RoHS
BAV19 A0G	Taiwan Semiconductor Corporation	100	200	1.25 @ 200 mA	100 nA @ 100 V	—	-55 to 175	DO-35	ROHS3
1N4148-T50A	Fairchild Semiconductor	100	200	1 @ 10 mA	5 µA @ 75 V	4	—55 to 175	DO-35	—
1N4148-T50R	onsemi	100	200	1 @ 10 mA	5 µA @ 75 V	4	-55 to 175	DO-35	ROHS3
1N4148TR	Fairchild Semiconductor	100	200	1 @ 10 mA	5 µA @ 75 V	4	-65 to 175	DO-35	ROHS3
1N4447	Microchip Technology	75	200	1 @ 20 mA	25 nA @ 20 V	4	-65 to 150	DO-35	Non-compliant
1N4448TR	Vishay General Semiconductor - Diodes Division	100	150	1 @ 100 mA	5 µA @ 75 V	8	—55 to 175	DO-35	ROHS3
1N914ATR	Fairchild Semiconductor	100	200	1 @ 20 mA	5 µA @ 75 V	4	—55 to 175	DO-35	—
1N914B	Taiwan Semiconductor Corporation	100	150	1 @ 100 mA	5 µA @ 75 V	4	-65 to 150	DO-35	ROHS3
1N914BTR	Fairchild Semiconductor	100	200	1 @ 100 mA	5 µA @ 75 V	4	-65 to 175	DO-35	—
1N914TR	Fairchild Semiconductor	100	200	1 @ 10 mA	5 µA @ 75 V	4	-65 to 175	DO-35	—

Engineering Selection Recommendations

Tier 1 - Full Electrical and Thermal Equivalents (Recommended for Direct Substitution):

The following parts meet or exceed all electrical specifications of the BAV19 A0G and maintain compatible operating temperature ranges:

1N4148-T50R (onsemi): Matches 100 V, 200 mA ratings with ROHS3 compliance and -55°C to 175°C operating range. Cut Tape packaging available with 39,503 units in stock.
1N4148TR (Fairchild Semiconductor): Matches 100 V, 200 mA ratings with ROHS3 compliance and extended lower temperature limit (-65°C to 175°C). 240,400 units in stock.
1N914BTR (Fairchild Semiconductor): Matches 100 V, 200 mA ratings with extended temperature range (-65°C to 175°C). 60,200 units in stock.
1N914TR (Fairchild Semiconductor): Matches 100 V, 200 mA ratings with extended temperature range (-65°C to 175°C). 2,187 units in stock.

Tier 2 - Electrical Equivalents with Reduced Current Rating (Application-Dependent):

The following parts meet voltage and package requirements but are rated for 150 mA average rectified current instead of 200 mA:

1N4448TR (Vishay General Semiconductor - Diodes Division): 100 V, 150 mA with ROHS3 compliance and -55°C to 175°C operating range. Suitable only for circuits where actual current does not exceed 150 mA. 19,900 units in stock.
1N914B (Taiwan Semiconductor Corporation): 100 V, 150 mA with ROHS3 compliance. Operating range -65°C to 150°C. Suitable only for circuits where actual current does not exceed 150 mA. 20,200 units in stock.

Tier 3 - Voltage-Reduced Substitute (Limited Application):

1N4447 (Microchip Technology): Rated for 75 V reverse voltage (below the 100 V requirement). Not RoHS compliant. Suitable only for applications where maximum reverse voltage does not exceed 75 V. 1,168 units in stock.

Tier 4 - Partial Equivalents (Not Recommended for Direct Substitution):

1N4148-T50A (Fairchild Semiconductor): Meets electrical specifications but RoHS compliance status not specified. 5,445,993 units in stock.
1N914ATR (Fairchild Semiconductor): Meets electrical specifications but RoHS compliance status not specified. 5,988 units in stock.

Frequently Asked Questions (FAQ)

Q: Can I use 1N4148-T50R as a direct replacement for BAV19 A0G?

A: Yes. The 1N4148-T50R meets all critical electrical parameters (100 V, 200 mA) and maintains the same operating temperature range (-55°C to 175°C). Both parts are ROHS3 compliant and packaged in DO-35 through-hole format. The 1N4148-T50R is available in Cut Tape packaging with high inventory levels.

Q: What is the difference between 1N4148TR and 1N914TR?

A: Both parts meet the BAV19 A0G electrical specifications (100 V, 200 mA) and are packaged in DO-35 format. The 1N4148TR is manufactured by Fairchild Semiconductor with ROHS3 compliance, while 1N914TR is also Fairchild but without specified RoHS status. Both support the extended temperature range of -65°C to 175°C. Selection depends on RoHS compliance requirements for the end application.

Q: Can I use 1N4448TR instead of BAV19 A0G?

A: The 1N4448TR is electrically compatible for voltage (100 V) and package (DO-35) but is rated for 150 mA average rectified current instead of 200 mA. This part is suitable only if the actual circuit current does not exceed 150 mA. If the application requires the full 200 mA capability, this substitute is not appropriate.

Q: Why is 1N4447 listed as a substitute if it has only 75 V rating?

A: The 1N4447 is included for applications where the actual reverse voltage in the circuit does not exceed 75 V. While it does not meet the full 100 V specification of the BAV19 A0G, it provides a functional alternative for lower-voltage applications. This part is not RoHS compliant and should be evaluated against specific application requirements.

Q: What does "Small Signal ≤ 200mA (Io), Any Speed" mean?

A: This classification indicates that the diode is designed for small-signal switching applications with average rectified current not exceeding 200 mA. "Any Speed" means the diode can operate in both fast-switching and slow-switching applications without speed-related restrictions. All listed substitute parts share this classification.

Q: Are all substitute parts available in the same packaging as BAV19 A0G?

A: All substitute parts listed are packaged in DO-35 through-hole format, which is mechanically compatible with the BAV19 A0G. Packaging variations (Bulk, Cut Tape, Tape & Reel) affect handling and assembly processes but do not change electrical performance or mechanical fit.

Q: Which substitute part has the best availability?

A: The 1N4148-T50A has the highest inventory level at 5,445,993 units in stock. For ROHS3-compliant alternatives, the 1N4148TR offers the largest inventory at 240,400 units, followed by 1N914BTR at 60,200 units.

Q: Can I use parts with lower forward voltage (Vf) than the BAV19 A0G?

A: Yes. Lower forward voltage indicates improved performance characteristics. All listed substitute parts have forward voltage ratings of 1 V or lower compared to the BAV19 A0G at 1.25 V. Lower forward voltage reduces power dissipation and heat generation in the circuit.

Q: What is the significance of reverse recovery time (trr)?

A: Reverse recovery time indicates how quickly the diode transitions from conducting to blocking state. The BAV19 A0G does not specify this parameter. Substitute parts with 4 ns trr (1N4148-T50R, 1N4148TR, 1N914ATR, 1N914B, 1N914BTR, 1N914TR) offer faster switching compared to 1N4448TR at 8 ns. Faster recovery time is beneficial for high-frequency switching applications.

Q: Does operating temperature range affect substitution decisions?

A: Yes. The BAV19 A0G operates from -55°C to 175°C. Substitute parts with extended lower temperature limits (such as 1N4148TR, 1N914BTR, 1N914TR at -65°C) provide additional margin for cold-temperature applications. Parts with reduced upper temperature limits (1N914B at 150°C) are not suitable if the application requires operation above 150°C.

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