BAV21 Equivalent & Substitute Parts

Part Overview

The BAV21 is a general-purpose rectifier diode manufactured by onsemi, rated for 250 V DC reverse voltage and 200 mA average rectified current in a DO-35 through-hole package. This component is classified as obsolete, indicating that direct sourcing from the original manufacturer is no longer available. Equivalent and substitute parts from active manufacturers provide functional alternatives that maintain electrical compatibility within specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	250	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 @ 200 V	nA
Capacitance @ Vr, F	5	pF @ 0V, 1MHz
Mounting Type	Through Hole	-
Package / Case	DO-204AH, DO-35, Axial	-
Operating Temperature - Junction (Max)	175	°C
Technology	Standard	-

Substitute Part Grouping Explanation

Substitution of the BAV21 is determined by the following critical electrical parameters:

Voltage Rating Compatibility: The BAV21 operates at 250 V DC reverse voltage. Substitute parts must meet or exceed this voltage specification to ensure safe operation in the original circuit application.

Current Rating Compatibility: The BAV21 is rated for 200 mA average rectified current. Substitute parts rated at 200 mA or higher maintain functional equivalence.

Forward Voltage Characteristics: Forward voltage drop at specified current levels must remain within acceptable circuit operating margins.

Reverse Recovery Time: The 50 ns reverse recovery time specification defines the switching speed category. Substitute parts with matching or faster recovery times maintain signal integrity.

Reverse Leakage Current: The 100 nA leakage specification at 200 V defines the diode's blocking characteristics and must be maintained or improved.

Package and Mounting: All substitute parts utilize through-hole mounting in DO-35 or equivalent axial packages, ensuring mechanical and electrical compatibility with existing PCB designs.

Substitute parts are grouped into two categories:

Category 1 - Parametric Equivalents: Parts with identical or superior electrical specifications across all critical parameters. These include BAV21-T50R, which matches the original 250 V / 200 mA rating and all electrical characteristics.

Category 2 - Functional Substitutes: Parts with reduced voltage ratings (200 V) but increased current capacity (250 mA), including BAV21,113, BAV21,133, and BAV21-TR. These are suitable for applications where the circuit voltage does not exceed 200 V and where higher current capacity provides design margin.

Category 3 - Partial Equivalents: The BAV21_AY_00001 maintains the original 200 mA current rating with reduced voltage (200 V) and represents a conservative substitute for lower-voltage applications.

Parameter Comparison

Parameter	BAV21 (onsemi)	BAV21-T50R (Fairchild)	BAV21,113 (Nexperia)	BAV21,133 (Nexperia)	BAV21,143 (Nexperia)	BAV21-TR (Vishay)	BAV21_AY_00001 (Panjit)
Voltage - DC Reverse (Vr) (Max)	250 V	250 V	200 V	200 V	200 V	200 V	200 V
Current - Average Rectified (Io)	200 mA	200 mA	250 mA	250 mA	250 mA	250 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 200 mA	1.25 V @ 200 mA	1.25 V @ 200 mA	1.25 V @ 200 mA	1.25 V @ 200 mA	1 V @ 100 mA	1 V @ 100 mA
Reverse Recovery Time (trr)	50 ns	50 ns	50 ns	50 ns	50 ns	50 ns	50 ns
Current - Reverse Leakage @ Vr	100 nA @ 200 V	100 nA @ 200 V	100 nA @ 200 V	100 nA @ 200 V	100 nA @ 200 V	100 nA @ 200 V	100 nA @ 200 V
Capacitance @ Vr, F	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	1.5 pF @ 0V, 1MHz	3 pF @ 0V, 1MHz
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
Operating Temperature - Junction (Max)	175°C	175°C	175°C	175°C	175°C	175°C	150°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	Not Specified	Not Specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Equivalent - BAV21-T50R (Fairchild Semiconductor):

The BAV21-T50R is the parametric equivalent to the BAV21. It maintains identical electrical specifications: 250 V reverse voltage, 200 mA average rectified current, 1.25 V forward voltage at 200 mA, and 50 ns reverse recovery time. The part is currently in active production status, ensuring long-term availability. This selection is appropriate for direct replacement in applications requiring the full 250 V rating and 200 mA current capacity.

Secondary Equivalents - BAV21,113, BAV21,133, BAV21-TR (Nexperia and Vishay):

These parts are suitable for applications where the circuit voltage does not exceed 200 V. All three parts are in active production and ROHS3 compliant. The BAV21-TR from Vishay offers improved forward voltage characteristics (1 V @ 100 mA) and lower capacitance (1.5 pF), making it advantageous for high-frequency applications. The Nexperia variants (BAV21,113 and BAV21,133) provide increased current capacity at 250 mA with identical forward voltage and reverse recovery specifications.

Conservative Substitute - BAV21_AY_00001 (Panjit International):

This part maintains the original 200 mA current rating and 50 ns reverse recovery time but operates at 200 V maximum reverse voltage. It is suitable for lower-voltage circuit applications. The operating temperature range is limited to -55°C to 150°C, which is 25°C lower than the original specification. This part is ROHS3 compliant and in active production.

Compliance Considerations:

All active substitute parts are ROHS3 compliant, ensuring compatibility with modern manufacturing and environmental standards. The original BAV21 is classified as REACH Unaffected, as are all substitute parts except BAV21-T50R, which is REACH Affected. This distinction does not affect electrical functionality but may influence supply chain documentation requirements.

Frequently Asked Questions (FAQ)

Q: Can BAV21,113, BAV21,133, or BAV21-TR be used in place of the BAV21 in all applications?

A: These parts are suitable for applications where the circuit voltage does not exceed 200 V. If the original circuit operates at voltages above 200 V, only BAV21-T50R maintains full compatibility. The 250 mA current rating of these parts provides additional design margin in lower-voltage applications.

Q: What is the difference between BAV21-T50R and the Nexperia variants?

A: BAV21-T50R maintains the original 250 V voltage rating and 200 mA current specification, making it a true parametric equivalent. The Nexperia parts (BAV21,113, BAV21,133, BAV21,143) reduce the voltage rating to 200 V but increase current capacity to 250 mA. Selection depends on circuit voltage requirements.

Q: Are all substitute parts available in the same DO-35 package?

A: Yes. All substitute parts utilize through-hole mounting in DO-35 or equivalent DO-204AH axial packages. Physical dimensions and pin configurations are compatible with existing PCB designs. Packaging formats vary (Cut Tape, Bulk, Tape & Box), but the component package itself remains consistent.

Q: Does the lower capacitance of BAV21-TR affect circuit performance?

A: The BAV21-TR exhibits lower capacitance (1.5 pF) compared to the original BAV21 (5 pF). In high-frequency applications, this reduction may improve switching performance and reduce parasitic effects. In low-frequency or DC applications, this difference is negligible.

Q: What is the significance of the operating temperature difference in BAV21_AY_00001?

A: The BAV21_AY_00001 has a maximum junction temperature of 150°C, compared to 175°C for the original BAV21 and most substitutes. This 25°C reduction limits its use in high-temperature environments. For applications operating near or above 150°C, alternative substitutes with 175°C ratings are required.

Q: Can BAV21-T50R be used in high-frequency switching applications?

A: BAV21-T50R is classified as a small-signal diode with any speed capability for currents ≤ 200 mA. The 50 ns reverse recovery time is suitable for moderate-frequency applications. For applications requiring faster switching (< 50 ns recovery), fast-recovery variants such as BAV21-TR should be evaluated.

Q: What inventory considerations should guide part selection?

A: BAV21-TR (Vishay) has the highest inventory at 83,571 pieces. BAV21-T50R (Fairchild) has 30,700 pieces available. Nexperia variants range from 5,773 to 29,252 pieces. BAV21_AY_00001 (Panjit) has limited inventory at 1,000 pieces. For long-term production requirements, parts with higher inventory levels provide greater supply security.

Q: Are there any compliance or certification differences between substitutes?

A: All active substitute parts are ROHS3 compliant. BAV21-T50R is REACH Affected, while all other substitutes are REACH Unaffected. These designations do not affect electrical performance but may require different documentation for certain supply chain or regulatory requirements.

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