BAV20,133 Equivalent & Substitute Parts

Part Overview

The BAV20,133 is a general-purpose rectifier diode manufactured by Nexperia USA Inc., rated for 150 V DC reverse voltage and 250 mA average rectified current. This fast recovery diode features a 50 ns reverse recovery time and is housed in a DO-35 axial through-hole package (ALF2 supplier package). The part is currently active in production and ROHS3 compliant.

Substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required, or when design flexibility permits operation within relaxed electrical parameters. The following equivalent and similar parts maintain functional compatibility within specified electrical and mechanical constraints.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	150	V
Current - Average Rectified (Io)	250	mA
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 200 mA	V
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	100 nA @ 150 V	nA
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
Operating Temperature - Junction (Max)	175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BAV20,133 is determined by the following critical electrical and mechanical parameters:

Voltage Rating Compatibility: The DC reverse voltage (Vr) must equal or exceed 150 V. Parts with lower voltage ratings (125 V) operate within reduced voltage margins and are classified as similar rather than parametric equivalents.

Current Rating Compatibility: The average rectified current (Io) must equal or exceed 250 mA. Parts rated for 200 mA or 100 mA represent reduced current capacity and are classified as similar parts.

Recovery Characteristics: Fast recovery diodes (trr ≤ 500 ns) are distinguished from small signal diodes. The BAV20,133 exhibits fast recovery characteristics; substitutes with small signal classification operate under different switching conditions.

Package and Mounting: All substitute parts maintain through-hole axial configuration (DO-35 / DO-204AH package family), ensuring mechanical and electrical compatibility with existing PCB layouts.

Compliance and Status: Active product status and ROHS3 compliance are preferred for new designs. Obsolete parts and non-compliant variants are identified for reference only.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) [V]	trr [ns]	Ir @ Vr [nA]	Package	Status	RoHS
BAV20,133	Nexperia USA Inc.	150	250	1.25 @ 200 mA	50	100 @ 150 V	DO-35 Axial	Active	ROHS3
BAV20,143	Nexperia USA Inc.	150	250	1.25 @ 200 mA	50	100 @ 150 V	DO-35 Axial	Active	ROHS3
1N4938-1	Microchip Technology	175	100	1 @ 100 mA	50	100 @ 175 V	DO-35 Axial	Active	Non-compliant
FDH300A	onsemi	125	200	1 @ 200 mA	—	1 @ 125 V	DO-35 Axial	Active	ROHS3
FDH300ATR	onsemi	125	200	1 @ 200 mA	—	1 @ 125 V	DO-35 Axial	Active	ROHS3
FDH300TR	onsemi	125	200	1 @ 200 mA	—	1 @ 125 V	DO-35 Axial	Active	ROHS3
FDH333	Fairchild Semiconductor	125	200	1.05 @ 200 mA	—	3 @ 125 V	DO-35 Axial	Obsolete	Non-compliant
FDH333TR	onsemi	125	200	1.15 @ 300 mA	—	3 @ 125 V	DO-35 Axial	Active	ROHS3

Engineering Selection Recommendations

Parametric Equivalent (Direct Substitution):

BAV20,143 is a parametric equivalent to BAV20,133. Both parts are manufactured by Nexperia USA Inc., share identical electrical specifications (150 V, 250 mA, 50 ns recovery time), and are ROHS3 compliant with active product status. The parts differ only in internal manufacturing or date code designation. BAV20,143 is suitable for direct substitution without circuit redesign.

Similar Parts (Reduced Electrical Ratings):

FDH300A, FDH300ATR, and FDH300TR are manufactured by onsemi and rated for 125 V reverse voltage and 200 mA average current. These parts operate within reduced voltage and current margins compared to the BAV20,133. All three variants are ROHS3 compliant and active. FDH300ATR and FDH300TR are supplied in cut tape packaging, while FDH300A is supplied in bulk. These parts are suitable for applications where the 125 V / 200 mA ratings satisfy circuit requirements.

FDH333TR is manufactured by onsemi, rated for 125 V and 200 mA, and is ROHS3 compliant with active status. This part is suitable for applications tolerating reduced voltage and current specifications.

Limited Compatibility (Non-Compliant or Obsolete):

1N4938-1 (Microchip Technology) is rated for 175 V and 100 mA but is RoHS non-compliant. This part is suitable only for legacy systems or applications where RoHS compliance is not required.

FDH333 (Fairchild Semiconductor) is obsolete and RoHS non-compliant. This part is not recommended for new designs.

Frequently Asked Questions (FAQ)

Q: Can BAV20,143 replace BAV20,133 in all applications?

A: Yes. BAV20,143 is a parametric equivalent with identical electrical specifications and compliance certifications. No circuit modifications are required.

Q: What is the difference between BAV20,133 and the FDH300 series?

A: The primary differences are voltage and current ratings. BAV20,133 is rated for 150 V and 250 mA, while FDH300 variants are rated for 125 V and 200 mA. FDH300 parts operate within reduced electrical margins and are suitable only for applications where these lower ratings are acceptable.

Q: Are FDH300ATR and FDH300TR electrically identical?

A: Yes. Both parts are manufactured by onsemi with identical electrical specifications (125 V, 200 mA). The difference is packaging format: FDH300ATR and FDH300TR are supplied in cut tape, while FDH300A is supplied in bulk.

Q: Why is 1N4938-1 listed as a substitute if it has lower current rating?

A: 1N4938-1 is listed as a similar part due to its presence in the original substitute list. However, the 100 mA current rating is below the BAV20,133 specification of 250 mA. This part is suitable only for applications requiring less than 100 mA average rectified current.

Q: Is FDH333 recommended for new designs?

A: No. FDH333 is obsolete and RoHS non-compliant. FDH333TR (onsemi, active, ROHS3 compliant) is the current equivalent if the FDH333 base part number is required.

Q: What packaging options are available for BAV20,133 substitutes?

A: All substitute parts maintain the through-hole axial DO-35 (DO-204AH) package configuration. Packaging variants differ only in supply format: cut tape (CT) for automated assembly or bulk for manual assembly. Electrical and mechanical compatibility with PCB layouts remains unchanged.

Q: Can I use a 125 V rated diode in a circuit designed for 150 V?

A: No. Using a 125 V rated diode in a 150 V circuit exceeds the component's voltage rating and creates reliability risk. The BAV20,133 or BAV20,143 (both 150 V rated) must be used for circuits specified at 150 V.

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