BA157GHB0G Equivalent & Substitute Parts

Part Overview

The BA157GHB0G 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 device is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing production and maintenance applications. The part carries automotive-grade qualification (AEC-Q101) and is ROHS3 compliant, making it suitable for demanding industrial and automotive environments.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) Maximum @ If	1.2	V @ 1 A
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Capacitance @ Vr, F	15	pF @ 4V, 1MHz
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Package / Case	DO-204AL, DO-41, Axial	-
Mounting Type	Through Hole	-
Operating Temperature - Junction	-55 to 150	°C
Grade	Automotive	-
Qualification	AEC-Q101	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the BA157GHB0G is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) Maximum: 400 V minimum
Current - Average Rectified (Io): 1 A minimum
Package / Case: DO-204AL, DO-41, or Axial through-hole configuration
Mounting Type: Through Hole
Operating Temperature Range: Must encompass -55°C to 150°C minimum

Secondary Compatibility Factors:

Voltage - Forward (Vf) Maximum: 1.2 V or lower at 1 A
Current - Reverse Leakage: 5 µA or lower at 400 V
Speed Classification: Fast Recovery (≤ 500ns) or Standard Recovery (> 500ns) acceptable based on circuit requirements
Compliance: ROHS3 and AEC-Q101 certification preferred for automotive applications

Parts are grouped into three categories:

Direct Equivalents: Identical electrical specifications and automotive qualification (BA157GHA0G)
Parametric Equivalents: Matching core electrical parameters with minor variations in secondary characteristics (1N4936G B0G, 1N4936GHB0G)
Similar Parts: Compatible voltage and current ratings with acceptable parameter variations (1N4004 series, 1N4246 series)

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ 1A (V)	trr (ns)	Ir @ 400V (µA)	C @ 4V (pF)	Speed	Package	Grade	AEC-Q101	Product Status
BA157GHB0G	Taiwan Semiconductor	400	1	1.2	150	5	15	Fast Recovery ≤ 500ns	DO-204AL	Automotive	Yes	Discontinued
BA157GHA0G	Taiwan Semiconductor	400	1	1.2	150	5	15	Fast Recovery ≤ 500ns	DO-204AL	Automotive	Yes	Active
1N4936G B0G	Taiwan Semiconductor	400	1	1.2	200	5	10	Fast Recovery ≤ 500ns	DO-204AL	-	-	Active
1N4936GHB0G	Taiwan Semiconductor	400	1	1.2	200	5	10	Fast Recovery ≤ 500ns	DO-204AL	Automotive	Yes	Active
1N4004-G	Comchip Technology	400	1	1.1	-	5	15	Standard Recovery > 500ns	DO-41	-	-	Active
1N4004-T	Diodes Incorporated	400	1	1.0	-	5	15	Standard Recovery > 500ns	DO-41	-	-	Last Time Buy
1N4004G	Rectron USA	400	1	1.0	-	0.2	15	Standard Recovery > 500ns	DO-41	Automotive	Yes	Active
1N4004GP-TP	Micro Commercial Co	400	1	1.1	2000	5	15	Standard Recovery > 500ns	DO-41	-	-	Active
1N4004RLG	onsemi	400	1	1.1	-	10	-	Standard Recovery > 500ns	Axial	-	-	Not For New Designs
1N4246GP-E3/54	Vishay General Semiconductor	400	1	1.2	-	1	8	Standard Recovery > 500ns	DO-204AL	-	-	Active
1N4246GP-E3/73	Vishay General Semiconductor	400	1	1.2	-	1	8	Standard Recovery > 500ns	DO-204AL	-	-	Active

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended):

BA157GHA0G is the primary substitute for BA157GHB0G. Both parts are manufactured by Taiwan Semiconductor Corporation with identical electrical specifications, automotive-grade qualification, and AEC-Q101 certification. BA157GHA0G maintains active product status with 712 pieces in stock, ensuring supply continuity. This part requires no circuit redesign or validation.

Tier 2 - Parametric Equivalent (Acceptable with Circuit Review):

1N4936GHB0G provides parametric equivalence with automotive qualification and AEC-Q101 certification. The reverse recovery time increases from 150 ns to 200 ns, and junction capacitance decreases from 15 pF to 10 pF. These variations are acceptable in most general-purpose rectification applications. This part is active with 1127 pieces in stock.

1N4936G B0G offers similar electrical performance without automotive-grade designation. Suitable for non-automotive applications where AEC-Q101 certification is not required.

Tier 3 - Similar Parts (Application-Dependent):

1N4004 series parts (1N4004-G, 1N4004-T, 1N4004G, 1N4004GP-TP, 1N4004RLG) meet voltage and current requirements but employ standard recovery technology (> 500ns) versus the fast recovery (≤ 500ns) of the BA157GHB0G. These parts are suitable for low-frequency rectification where switching speed is not critical. 1N4004G from Rectron USA carries automotive qualification and AEC-Q101 certification with active status.

1N4246 series parts (1N4246GP-E3/54, 1N4246GP-E3/73) from Vishay General Semiconductor provide superior reverse leakage characteristics (1 µA versus 5 µA) and lower capacitance (8 pF versus 15 pF), beneficial in high-impedance or high-frequency applications. Both variants are active with adequate inventory.

Compliance and Certification:

For automotive applications requiring AEC-Q101 certification, select from: BA157GHA0G, 1N4936GHB0G, or 1N4004G. All three maintain active product status and ROHS3 compliance.

For general industrial applications without automotive requirements, 1N4246 series parts offer superior performance characteristics with active status and ROHS3 compliance.

Avoid 1N4004-T (Last Time Buy status) and 1N4004RLG (Not For New Designs status) for new designs unless existing inventory constraints necessitate their use.

Frequently Asked Questions (FAQ)

Q: Can BA157GHA0G directly replace BA157GHB0G without circuit modification?

A: Yes. BA157GHA0G is a direct equivalent with identical electrical specifications, package configuration, and automotive qualification. No circuit redesign is required. The primary difference is product status: BA157GHA0G is active while BA157GHB0G is discontinued.

Q: What is the difference between fast recovery and standard recovery diodes, and does it matter for my application?

A: Fast recovery diodes (≤ 500ns reverse recovery time) switch off more quickly, reducing switching losses in high-frequency applications. Standard recovery diodes (> 500ns) are suitable for low-frequency rectification where switching speed is not critical. The BA157GHB0G uses fast recovery technology. If your circuit operates at line frequency (50/60 Hz) or lower, standard recovery alternatives like 1N4004 series parts are acceptable. For switching power supplies or higher-frequency applications, maintain fast recovery technology.

Q: Are 1N4004 series parts suitable replacements for BA157GHB0G?

A: 1N4004 series parts meet the voltage (400 V) and current (1 A) requirements and share the same through-hole package. However, they employ standard recovery technology versus the fast recovery of BA157GHB0G. For low-frequency rectification applications, 1N4004 parts are functionally compatible. For switching applications or circuits sensitive to reverse recovery time, use parametric equivalents like 1N4936GHB0G instead.

Q: What does AEC-Q101 certification mean, and why is it important?

A: AEC-Q101 is the Automotive Electronics Council qualification standard for discrete semiconductors. It certifies that components meet stringent reliability, temperature cycling, and performance requirements for automotive applications. If your application is automotive or requires equivalent reliability standards, select parts with AEC-Q101 certification: BA157GHA0G, 1N4936GHB0G, or 1N4004G.

Q: Can I use 1N4246 series parts instead of BA157GHB0G?

A: Yes, with application-specific considerations. 1N4246 parts meet voltage and current requirements and offer superior reverse leakage (1 µA versus 5 µA) and lower capacitance (8 pF versus 15 pF). These characteristics are beneficial in high-impedance circuits or applications sensitive to leakage current. However, 1N4246 parts use standard recovery technology. Verify that your circuit does not require the fast recovery characteristics of the original BA157GHB0G.

Q: What is the significance of reverse leakage current differences between parts?

A: Reverse leakage current is the small current that flows through a reverse-biased diode. BA157GHB0G specifies 5 µA at 400 V, while 1N4246 parts specify 1 µA at 400 V. In high-impedance circuits or precision analog applications, lower leakage is advantageous. In standard power rectification, the difference is negligible. 1N4004RLG specifies 10 µA, which is acceptable for most applications but less desirable in sensitive circuits.

Q: Why do some parts show "Not For New Designs" or "Last Time Buy" status?

A: These designations indicate that manufacturers are discontinuing production. "Last Time Buy" means a final production run is available before discontinuation. "Not For New Designs" indicates the part is obsolete and should not be used in new circuit designs. Use these parts only if existing inventory constraints require it, and plan migration to active alternatives.

Q: Are all listed parts ROHS3 compliant?

A: Yes. All parts in this reference are ROHS3 compliant, meeting the Restriction of Hazardous Substances directive. This compliance is mandatory for most industrial and consumer applications in regulated markets.

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

A: DO-204AL and DO-41 refer to the same through-hole axial package. DO-204AL is the formal JEDEC designation, while DO-41 is the legacy designation. These terms are used interchangeably in component specifications. All parts listed use this same physical package configuration.

Q: Can I substitute a part with lower forward voltage drop?

A: Yes, if your circuit can tolerate it. Lower forward voltage drop (Vf) reduces power dissipation and heat generation. For example, 1N4004-T specifies 1.0 V versus BA157GHB0G at 1.2 V. This is beneficial in low-voltage or high-current applications. However, verify that your circuit design does not depend on the original forward voltage characteristic, particularly in precision rectifier or detector circuits.

Q: What inventory levels should I consider when selecting a substitute?

A: Inventory levels provided in this reference indicate current availability. BA157GHA0G (712 pieces), 1N4936GHB0G (1127 pieces), and 1N4004G (10300 pieces) offer adequate stock for production planning. For long-term supply security, 1N4004 series parts from multiple manufacturers provide the highest inventory levels across the industry.

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