BAV21 Equivalent & Substitute Parts

Part Overview

The BAV21 is a small signal rectifier diode manufactured by Diodes Incorporated, rated for 200 V DC reverse voltage and 200 mA average rectified current in a DO-35 through-hole package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The BAV21 operates as a general-purpose rectifier diode suitable for applications requiring small signal switching and rectification at moderate voltage levels.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1	V @ 100 mA
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	100	nA @ 200 V
Mounting Type	Through Hole	-
Package / Case	DO-204AH, DO-35, Axial	-
Product Status	Obsolete	-

Substitute Part Grouping Explanation

Substitute parts for the BAV21 are classified into two functional groups based on electrical parameter compatibility:

Group 1: Full Electrical Equivalents (200 V / 200 mA)

Parts in this group maintain identical voltage and current ratings to the BAV21. These substitutes are direct replacements with no circuit redesign required:

Voltage - DC Reverse (Vr) (Max): 200 V
Current - Average Rectified (Io): 200 mA
Voltage - Forward (Vf) (Max) @ If: 1 V @ 100 mA
Mounting Type: Through Hole
Package / Case: DO-35

Group 2: Reduced Voltage Substitutes (100 V / 150-200 mA)

Parts in this group operate at lower voltage ratings but maintain compatible current handling. These substitutes are applicable only in circuits where the maximum reverse voltage does not exceed 100 V:

Voltage - DC Reverse (Vr) (Max): 100 V
Current - Average Rectified (Io): 150-200 mA
Voltage - Forward (Vf) (Max) @ If: 1 V @ 100 mA
Mounting Type: Through Hole
Package / Case: DO-35

Group 3: Enhanced Current Substitutes (200 V / 250 mA)

Parts in this group maintain the 200 V voltage rating while providing increased current capacity. These substitutes are backward-compatible for all BAV21 applications:

Voltage - DC Reverse (Vr) (Max): 200 V
Current - Average Rectified (Io): 250 mA
Mounting Type: Through Hole
Package / Case: DO-35 or ALF2

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [nA]	Package	Product Status	RoHS Status
BAV21	Diodes Incorporated	200	200	1 @ 100 mA	50	100 @ 200 V	DO-35	Obsolete	Non-compliant
1N485B	Microchip Technology	200	200	1 @ 100 mA	-	1000 @ 200 V	DO-35	Active	Non-compliant
1N485BTR	onsemi	200	200	1 @ 100 mA	-	25 @ 175 V	DO-35	Active	ROHS3 Compliant
1N914B	Taiwan Semiconductor Corporation	100	150	1 @ 100 mA	4	5000 @ 75 V	DO-35	Active	ROHS3 Compliant
1N914BTR	Fairchild Semiconductor	100	200	1 @ 100 mA	4	5000 @ 75 V	DO-35	Active	-
BAV21,113	Nexperia USA Inc.	200	250	1.25 @ 200 mA	50	100 @ 200 V	ALF2	Active	ROHS3 Compliant
BAV21,133	Nexperia USA Inc.	200	250	1.25 @ 200 mA	50	100 @ 200 V	ALF2	Active	ROHS3 Compliant
BAV21,143	Nexperia USA Inc.	200	250	1.25 @ 200 mA	50	100 @ 200 V	ALF2	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (No Circuit Modification Required)

The 1N485BTR manufactured by onsemi is the primary substitute for the BAV21. This part maintains identical electrical specifications (200 V, 200 mA) and DO-35 package configuration. The 1N485BTR holds active product status and achieves ROHS3 compliance, addressing the obsolescence and regulatory limitations of the original BAV21. The onsemi variant is available in Cut Tape packaging, supporting both prototype and production environments.

For RoHS Compliance Upgrade

Applications requiring RoHS3 compliance should transition to 1N485BTR (onsemi) or the Nexperia BAV21 variants (BAV21,113, BAV21,133, BAV21,143). These parts maintain the BAV21 base product number designation while offering enhanced current capacity (250 mA) and full regulatory compliance. The Nexperia variants are supplied in ALF2 package format with Cut Tape packaging.

For Reduced Voltage Applications

In circuits where the maximum reverse voltage requirement does not exceed 100 V, the 1N914BTR (Fairchild Semiconductor) or 1N914B (Taiwan Semiconductor Corporation) provide active alternatives. Both parts maintain the DO-35 package and support 200 mA current handling. The 1N914BTR achieves extended operating temperature range (-65°C to 175°C) compared to the 1N914B (-65°C to 150°C).

For Enhanced Current Capacity

Applications requiring current capacity beyond 200 mA should specify BAV21,113, BAV21,133, or BAV21,143 from Nexperia USA Inc. These parts deliver 250 mA average rectified current while maintaining the 200 V voltage rating and 50 ns reverse recovery time of the original BAV21. All three variants are ROHS3 compliant and available in active production status.

Frequently Asked Questions (FAQ)

Q: Can the 1N914B or 1N914BTR be used as a direct replacement for the BAV21?

A: The 1N914B and 1N914BTR are not direct replacements. These parts operate at 100 V maximum reverse voltage, compared to the BAV21's 200 V rating. Substitution is valid only in circuits where the applied reverse voltage does not exceed 100 V. Current handling is compatible (150-200 mA range). Verify circuit voltage requirements before selection.

Q: What is the difference between 1N485B and 1N485BTR?

A: Both parts maintain identical electrical specifications (200 V, 200 mA, DO-35 package). The primary differences are manufacturer (Microchip Technology versus onsemi) and regulatory compliance. The 1N485BTR achieves ROHS3 compliance, while the 1N485B is RoHS non-compliant. The 1N485BTR is supplied in Cut Tape packaging format.

Q: Are the Nexperia BAV21,113, BAV21,133, and BAV21,143 interchangeable?

A: Yes. All three Nexperia variants share identical electrical specifications (200 V, 250 mA, 50 ns reverse recovery time, 100 nA reverse leakage). The part number suffixes (113, 133, 143) represent different manufacturing batches or tape configurations. All are ROHS3 compliant and available in ALF2 package format with Cut Tape delivery.

Q: What is the impact of using a 250 mA rated diode in a 200 mA application?

A: Substituting a 250 mA rated diode (BAV21,113, BAV21,133, BAV21,143) in a 200 mA application introduces no functional risk. The higher current rating provides design margin and extended component life. Forward voltage increases slightly (1.25 V @ 200 mA versus 1 V @ 100 mA), which may affect circuit performance in precision applications. Verify forward voltage impact in critical circuits.

Q: Is the ALF2 package compatible with DO-35 footprints?

A: The ALF2 and DO-35 packages are both axial through-hole configurations with similar lead spacing. Physical compatibility depends on specific PCB footprint design. Verify footprint dimensions and lead diameter specifications before substituting ALF2 variants (BAV21,113, BAV21,133, BAV21,143) into existing DO-35 designs.

Q: Which substitute offers the best long-term availability?

A: The 1N485BTR (onsemi) and Nexperia BAV21 variants (BAV21,113, BAV21,133, BAV21,143) hold active product status with established supply chains. The 1N485BTR provides direct electrical equivalence with modern compliance certifications. The Nexperia variants offer enhanced current capacity and are manufactured under the original BAV21 base product designation, supporting long-term design continuity.

Q: Can the BAV21 be used in new designs, or should substitutes be specified?

A: The BAV21 is classified as obsolete and should not be specified in new designs. Active alternatives such as 1N485BTR or Nexperia BAV21 variants should be selected for all new applications. Existing designs using BAV21 should transition to active substitutes during the next design revision cycle to ensure supply continuity and regulatory compliance.

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