BA157G A0G Equivalent & Substitute Parts

Part Overview

The BA157G A0G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 400 V DC reverse voltage and 1 A average rectified current in a DO-204AL (DO-41) through-hole axial package. This component is classified as a fast recovery diode with a reverse recovery time of 150 ns, suitable for standard rectification applications requiring rapid switching characteristics. The part is Active in product status and RoHS3 compliant.

Equivalent and substitute parts are identified based on matching electrical specifications including reverse voltage rating, average rectified current, forward voltage characteristics, recovery speed classification, and compatible through-hole packaging. Substitutes enable design flexibility, supply chain alternatives, and procurement optimization while maintaining circuit performance within specified parameters.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 1 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Capacitance @ Vr, F	15	pF @ 4V, 1MHz
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution logic for the BA157G A0G is based on the following critical parameters:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 400 V minimum
Current - Average Rectified (Io): 1 A minimum
Package / Case: DO-204AL, DO-41, or Axial through-hole compatible
Mounting Type: Through Hole

Recovery Speed Classification: Substitute parts are grouped into two categories based on recovery characteristics:

Fast Recovery Diodes (≤ 500ns, > 200mA): Direct functional equivalents with identical switching performance to BA157G A0G. These parts include RGP10G (Fairchild Semiconductor) with 150 ns reverse recovery time.
Standard Recovery Diodes (>500ns, > 200mA): Functionally compatible substitutes with slower switching characteristics. These parts include 1N4004-E3/54, 1N4004-E3/73, 1N4004-G, 1N4004E-E3/54, 1N4004-E3/53, 1N4004E-E3/53, 1N4004-T, 1N4004G, and 1N4004GP-E3/54. Standard recovery diodes are suitable for applications where fast switching is not required.

Compliance and Certification: All direct substitute parts maintain RoHS3 compliance and REACH unaffected status. Operating temperature ranges vary across manufacturers; selection should account for specific thermal requirements.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [V]	Speed Classification	trr [ns]	Package	Product Status
BA157G A0G	Taiwan Semiconductor Corporation	400	1	1.2	Fast Recovery ≤ 500ns	150	DO-204AL (DO-41)	Active
1N4004-E3/54	Vishay General Semiconductor - Diodes Division	400	1	1.1	Standard Recovery >500ns	—	DO-204AL (DO-41)	Active
1N4004-E3/73	Vishay General Semiconductor - Diodes Division	400	1	1.1	Standard Recovery >500ns	—	DO-204AL (DO-41)	Active
1N4004-G	Comchip Technology	400	1	1.1	Standard Recovery >500ns	—	DO-41	Active
1N4004E-E3/54	Vishay General Semiconductor - Diodes Division	400	1	1.1	Standard Recovery >500ns	—	DO-204AL (DO-41)	Active
RGP10G	Fairchild Semiconductor	400	1	1.3	Fast Recovery ≤ 500ns	150	DO-41	Active
1N4004-E3/53	Vishay General Semiconductor - Diodes Division	400	1	1.1	Standard Recovery >500ns	—	DO-204AL (DO-41)	Active
1N4004-T	Diodes Incorporated	400	1	1.0	Standard Recovery >500ns	—	DO-41	Last Time Buy
1N4004E-E3/53	Vishay General Semiconductor - Diodes Division	400	1	1.1	Standard Recovery >500ns	—	DO-204AL (DO-41)	Active
1N4004G	Rectron USA	400	1	1.0	Standard Recovery >500ns	—	DO-41	Active
1N4004GP-E3/54	Vishay General Semiconductor - Diodes Division	400	1	1.1	Standard Recovery >500ns	2000	DO-204AL (DO-41)	Active

Engineering Selection Recommendations

Direct Functional Equivalents (Fast Recovery):

RGP10G (Fairchild Semiconductor) is the primary direct equivalent to BA157G A0G, matching both fast recovery speed classification (150 ns reverse recovery time) and 400 V / 1 A electrical ratings. RGP10G is Active in product status with high inventory availability (17,200 pcs). Operating temperature range extends to -65°C to 175°C, providing broader thermal coverage than the BA157G A0G (-55°C to 150°C).

Compatible Substitutes (Standard Recovery):

The 1N4004 series diodes from multiple manufacturers (Vishay, Comchip Technology, Diodes Incorporated, Rectron USA) provide functional substitution with standard recovery characteristics (>500ns). These parts maintain identical 400 V / 1 A ratings and through-hole packaging. All Active status variants are suitable for applications where switching speed is not performance-critical.

Packaging Considerations:

Parts specified as DO-204AL (DO-41) are directly interchangeable in through-hole PCB layouts. Parts specified as DO-41 only are mechanically compatible but may have minor dimensional variations; verify footprint compatibility in specific applications.

Product Status Impact:

1N4004-T (Diodes Incorporated) carries Last Time Buy status, indicating discontinued production. This part should be avoided for new designs requiring long-term supply continuity. All other substitute parts maintain Active status.

Compliance Verification:

All substitute parts listed are RoHS3 compliant and REACH unaffected, matching the BA157G A0G compliance profile. 1N4004G (Rectron USA) includes AEC-Q101 automotive qualification, providing additional assurance for automotive applications.

Frequently Asked Questions (FAQ)

Q: Can I substitute a standard recovery 1N4004 diode for the fast recovery BA157G A0G?

A: Standard recovery 1N4004 diodes are electrically compatible for voltage and current ratings (400 V / 1 A) and share identical through-hole packaging. However, they exhibit slower reverse recovery time (>500ns vs. 150 ns). Substitution is valid only for applications where switching speed is not a performance requirement. High-frequency rectification circuits may experience degraded performance with standard recovery parts.

Q: What is the difference between DO-204AL and DO-41 package designations?

A: DO-204AL and DO-41 refer to the same physical package: a through-hole axial diode with identical lead spacing and mounting footprint. DO-204AL is the formal JEDEC designation, while DO-41 is the legacy industry designation. Parts specified as either designation are mechanically interchangeable in standard through-hole PCB layouts.

Q: Are all listed substitute parts RoHS3 compliant?

A: All substitute parts listed with Active product status are RoHS3 compliant. RGP10G (Fairchild Semiconductor) does not specify RoHS status in provided data. Verify RoHS compliance with the manufacturer for RGP10G if required for your application.

Q: Why does RGP10G have a higher forward voltage (1.3 V) than the BA157G A0G (1.2 V)?

A: Forward voltage variation within the same voltage and current rating class is normal across manufacturers and manufacturing processes. The 0.1 V difference between RGP10G and BA157G A0G is within typical tolerance ranges for general-purpose rectifier diodes and does not affect functional compatibility in standard rectification circuits. Verify forward voltage impact in power dissipation calculations for specific applications.

Q: Should I use 1N4004-T for new designs?

A: No. 1N4004-T carries Last Time Buy product status, indicating discontinued production. For new designs requiring long-term supply continuity, select from Active status alternatives such as 1N4004-E3/54, 1N4004-G, or 1N4004E-E3/54.

Q: What is the operating temperature range difference between BA157G A0G and substitute parts?

A: BA157G A0G operates from -55°C to 150°C. RGP10G extends to -65°C to 175°C, providing broader thermal coverage. 1N4004 series variants range from -50°C to 175°C depending on manufacturer. Select parts based on specific thermal requirements of your application; narrower temperature ranges may limit use in extreme environments.

Q: Can I use 1N4004GP-E3/54 (SUPERECTIFIER® series) as a direct replacement?

A: 1N4004GP-E3/54 is electrically compatible with identical 400 V / 1 A ratings and DO-204AL packaging. However, it exhibits significantly slower reverse recovery time (2 µs vs. 150 ns for BA157G A0G) and lower capacitance (8 pF vs. 15 pF). This part is suitable for standard rectification but not for fast switching applications. Verify performance impact in your specific circuit before substitution.

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