BA157-TP Equivalent & Substitute Parts

Part Overview

The BA157-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 400 V DC reverse voltage and 1 A average rectified current in a DO-41 through-hole package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The BA157-TP operates across a junction temperature range of -65°C to 125°C and complies with RoHS3 standards.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.3	V @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction	-65 to 125	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BA157-TP is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Substitution Parameters:

Voltage - DC Reverse (Vr) (Max): 400 V
Current - Average Rectified (Io): 1 A
Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, Axial
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
RoHS Compliance: ROHS3 Compliant

Substitute parts must meet or exceed these specifications without degradation of electrical performance. Forward voltage, reverse recovery time, and reverse leakage current are secondary parameters that may vary within acceptable ranges while maintaining functional equivalence. Operating temperature range may differ based on application requirements.

Parameter Comparison

Parameter	BA157-TP (Main)	1N4936G R1G (Substitute)	BA157-E3/54 (Equivalent)
Manufacturer	Micro Commercial Co	Taiwan Semiconductor Corporation	Vishay General Semiconductor - Diodes Division
Product Status	Obsolete	Active	Active
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 V
Current - Average Rectified (Io)	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1 A	1.2 V @ 1 A	1.3 V @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	150 ns	200 ns	150 ns
Current - Reverse Leakage @ Vr	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V
Capacitance @ Vr, F	15 pF @ 4V, 1MHz	10 pF @ 4V, 1MHz	12 pF @ 4V, 1MHz
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Operating Temperature - Junction	-65°C ~ 125°C	-55°C ~ 150°C	-65°C ~ 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

BA157-E3/54 (Parametric Equivalent): This part is the primary equivalent for BA157-TP replacement. Manufactured by Vishay General Semiconductor - Diodes Division, the BA157-E3/54 shares the same base product number (BA157) and maintains identical electrical specifications including 400 V reverse voltage, 1 A average rectified current, 1.3 V forward voltage at 1 A, and 150 ns reverse recovery time. Both parts operate across -65°C to 125°C and comply with RoHS3 standards. The BA157-E3/54 is actively produced with substantial inventory availability (18,950 pcs), ensuring long-term procurement reliability. Packaging is supplied as Cut Tape (CT), suitable for automated assembly processes.

1N4936G R1G (Functional Substitute): This part manufactured by Taiwan Semiconductor Corporation provides functional substitution with active product status and higher operating temperature range (-55°C to 150°C). Electrical specifications are equivalent across all critical parameters: 400 V reverse voltage, 1 A average rectified current, and fast recovery speed classification. The 1N4936G R1G exhibits a lower forward voltage (1.2 V @ 1 A) and slightly longer reverse recovery time (200 ns) compared to BA157-TP, both within acceptable operational margins. This part is suitable for applications requiring extended temperature performance or where the lower forward voltage provides thermal efficiency benefits.

Selection between these substitutes depends on application-specific requirements: choose BA157-E3/54 for direct parametric equivalence and identical temperature range; choose 1N4936G R1G for extended temperature capability or improved forward voltage characteristics.

Frequently Asked Questions (FAQ)

Q: Can BA157-E3/54 be used as a direct replacement for BA157-TP?

A: Yes. The BA157-E3/54 is a parametric equivalent with identical electrical specifications across all critical parameters: 400 V reverse voltage, 1 A average rectified current, 1.3 V forward voltage at 1 A, 150 ns reverse recovery time, and -65°C to 125°C operating temperature range. Both parts use the same DO-204AL/DO-41 axial through-hole package and comply with RoHS3 standards.

Q: What is the difference between BA157-E3/54 and 1N4936G R1G?

A: Both parts meet the core electrical requirements of 400 V reverse voltage and 1 A average rectified current. The BA157-E3/54 maintains identical specifications to BA157-TP including 1.3 V forward voltage and 150 ns reverse recovery time. The 1N4936G R1G offers a lower forward voltage (1.2 V @ 1 A), longer reverse recovery time (200 ns), and extended operating temperature range (-55°C to 150°C). Selection depends on whether your application requires exact parametric matching or benefits from the 1N4936G R1G's extended temperature capability.

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

A: Yes. BA157-TP, BA157-E3/54, and 1N4936G R1G all use DO-204AL/DO-41 axial through-hole packages. This ensures mechanical and electrical compatibility in existing PCB layouts without modification. Packaging format differs (BA157-TP and 1N4936G R1G in standard packaging; BA157-E3/54 supplied as Cut Tape), but the component package itself is identical.

Q: Why is BA157-TP classified as obsolete?

A: BA157-TP is listed as obsolete by the original manufacturer, Micro Commercial Co. This classification indicates the part is no longer in active production. BA157-E3/54 and 1N4936G R1G are both actively produced alternatives that provide equivalent or superior functionality, ensuring design continuity and long-term supply chain stability.

Q: Do all substitute parts comply with RoHS3?

A: Yes. BA157-TP, BA157-E3/54, and 1N4936G R1G are all RoHS3 compliant with Moisture Sensitivity Level (MSL) 1 (Unlimited), indicating no moisture sensitivity concerns during storage or handling.

Q: What is the significance of reverse recovery time differences?

A: Reverse recovery time (trr) affects switching speed and switching losses in high-frequency applications. BA157-TP and BA157-E3/54 both specify 150 ns trr, while 1N4936G R1G specifies 200 ns. For applications operating below 500 kHz, this difference is negligible. For higher-frequency switching applications, the 150 ns specification of BA157-TP or BA157-E3/54 may provide lower switching losses.

Q: Can forward voltage differences affect circuit performance?

A: Forward voltage differences between 1.2 V (1N4936G R1G) and 1.3 V (BA157-TP, BA157-E3/54) are typically 0.1 V. In power supply and rectification circuits, this represents a minor voltage drop variation. In precision analog circuits or low-voltage applications, verify that the forward voltage specification aligns with circuit design margins. The lower forward voltage of 1N4936G R1G may provide marginal efficiency improvements in high-current applications.

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