BA157-AP Equivalent & Substitute Parts

Part Overview

The BA157-AP is a general-purpose rectifier diode rated for 400 V DC reverse voltage and 1 A average rectified current in a through-hole DO-41 package. Manufactured by Micro Commercial Co, this component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. The BA157-AP operates across a junction temperature range of -65°C to 125°C and exhibits fast recovery characteristics with a reverse recovery time of 150 ns. Equivalent and substitute parts must maintain electrical performance within the specified voltage, current, and thermal parameters while accommodating available packaging options.

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
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Mounting Type	Through Hole	-
Package / Case	DO-204AL, DO-41, Axial	-
Operating Temperature - Junction	-65 to 125	°C
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitute parts for the BA157-AP are classified into four categories based on electrical equivalence and product status:

Direct Manufacturer Equivalent (BA157GP-AP): Identical electrical specifications with matching voltage, current, and recovery time parameters. Differs only in product status (active vs. obsolete) and maximum junction temperature (150°C vs. 125°C). Supplier device package remains DO-41.

Upgrade Equivalent (RGP10GE-E3/54): Maintains all critical electrical parameters including 400 V reverse voltage, 1 A current rating, and 150 ns reverse recovery time. Extends maximum junction temperature to 175°C. Supplied in DO-204AL package designation with identical mechanical compatibility. Manufactured by Vishay General Semiconductor under the SUPERECTIFIER® series.

Similar Performance Substitute (MUR140RLG): Meets voltage and current specifications with improved reverse recovery time of 75 ns (faster than 150 ns baseline). Forward voltage slightly reduced to 1.25 V @ 1 A. Supplied in axial package format. Manufactured by onsemi under the SWITCHMODE™ series. Maximum junction temperature rated to 175°C.

Similar Performance Substitute (UF1004-T): Matches voltage and current ratings with superior reverse recovery time of 50 ns. Forward voltage equivalent at 1.3 V @ 1 A. Capacitance specification provided at 20 pF @ 4V, 1MHz. Supplied in DO-41 package. Manufactured by Diodes Incorporated. Maximum junction temperature rated to 150°C.

Parametric Equivalent (BA157-E3/73): Identical electrical specifications to BA157-AP with matching 400 V, 1 A, and 150 ns parameters. Supplied in DO-204AL package. Manufactured by Vishay General Semiconductor. Maximum junction temperature matches baseline at 125°C. Capacitance specification at 12 pF @ 4V, 1MHz.

Substitution logic is based on strict equivalence of voltage rating (400 V), current rating (1 A), reverse recovery time classification (fast recovery ≤ 500 ns), reverse leakage current (5 µA @ 400 V), and through-hole mounting compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Package	Tj (Max) [°C]	RoHS
BA157-AP	Micro Commercial Co	Obsolete	400	1	1.3 @ 1 A	150	5 @ 400 V	DO-41	125	ROHS3
BA157GP-AP	Micro Commercial Co	Active	400	1	1.3 @ 1 A	150	5 @ 400 V	DO-41	150	ROHS3
RGP10GE-E3/54	Vishay General Semiconductor	Active	400	1	1.3 @ 1 A	150	5 @ 400 V	DO-204AL	175	ROHS3
MUR140RLG	onsemi	Active	400	1	1.25 @ 1 A	75	5 @ 400 V	Axial	175	ROHS3
UF1004-T	Diodes Incorporated	Active	400	1	1.3 @ 1 A	50	5 @ 400 V	DO-41	150	ROHS3
BA157-E3/73	Vishay General Semiconductor	Active	400	1	1.3 @ 1 A	150	5 @ 400 V	DO-204AL	125	ROHS3

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): BA157GP-AP is the primary direct equivalent, offering identical electrical performance with active product status. This part maintains the same DO-41 package and forward voltage characteristics. The extended maximum junction temperature to 150°C provides additional thermal margin compared to the obsolete BA157-AP baseline.

For Extended Thermal Performance: RGP10GE-E3/54 and MUR140RLG both support maximum junction temperatures of 175°C, providing 50°C additional thermal headroom. RGP10GE-E3/54 maintains exact electrical specifications including 150 ns reverse recovery time. MUR140RLG offers faster recovery at 75 ns with marginally lower forward voltage (1.25 V vs. 1.3 V), suitable for applications requiring reduced switching losses.

For Optimized Recovery Characteristics: UF1004-T provides the fastest reverse recovery time at 50 ns while maintaining all voltage and current specifications. This part is appropriate for high-frequency switching applications where recovery time directly impacts efficiency. The DO-41 package ensures mechanical compatibility with existing through-hole designs.

For Parametric Equivalence: BA157-E3/73 provides exact electrical matching to BA157-AP specifications with active product status and Vishay manufacturing. This part is suitable for applications with strict parameter matching requirements and thermal constraints at 125°C maximum junction temperature.

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity classification, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can BA157GP-AP be used as a direct replacement for BA157-AP? A: Yes. BA157GP-AP maintains identical electrical specifications including 400 V reverse voltage, 1 A current rating, 1.3 V forward voltage, and 150 ns reverse recovery time. The primary difference is product status (active vs. obsolete) and extended maximum junction temperature to 150°C. Both parts use DO-41 packaging.

Q: What is the difference between DO-41 and DO-204AL packaging? A: DO-41 and DO-204AL are equivalent designations for the same axial through-hole package format. Both accommodate the same physical footprint and lead spacing. Parts specified as DO-204AL (DO-41) or DO-41 are mechanically interchangeable in through-hole applications.

Q: Why does MUR140RLG have a lower reverse recovery time (75 ns vs. 150 ns)? A: MUR140RLG is manufactured using different semiconductor technology optimized for faster switching. The 75 ns reverse recovery time reduces switching losses in high-frequency applications. This represents an improvement over the BA157-AP baseline while maintaining identical voltage and current ratings.

Q: Is UF1004-T suitable for high-frequency switching applications? A: Yes. UF1004-T provides the fastest reverse recovery time among available substitutes at 50 ns. This characteristic reduces switching losses and is beneficial in applications operating above standard line frequency. All other electrical parameters match BA157-AP specifications.

Q: Can axial package parts (MUR140RLG) be used in place of DO-41 parts? A: Axial and DO-41 packages are mechanically different. MUR140RLG uses an axial lead configuration while BA157-AP uses DO-41 (axial leads in a different physical arrangement). Substitution requires verification of PCB footprint compatibility and lead spacing. Both are through-hole mounting types but occupy different physical space.

Q: What is the significance of the 5 µA reverse leakage current specification? A: The 5 µA reverse leakage current at 400 V is a standard specification for general-purpose rectifier diodes at this voltage rating. All substitute parts maintain this specification, ensuring equivalent leakage performance and reliability in DC blocking applications.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance, ensuring compatibility with environmental regulations and manufacturing standards. MSL 1 (Unlimited) moisture sensitivity classification applies to all parts except MUR140RLG, which is not applicable for axial package types.

Q: What is the maximum junction temperature difference between substitute options? A: Maximum junction temperature ranges from 125°C (BA157-AP, BA157-E3/73) to 175°C (RGP10GE-E3/54, MUR140RLG). The 50°C difference provides additional thermal margin in applications with elevated ambient temperatures or high power dissipation. Selection depends on specific thermal design requirements.

Q: Can BA157-E3/73 be used as a long-term replacement for obsolete BA157-AP? A: Yes. BA157-E3/73 provides parametric equivalence with identical electrical specifications and active product status from Vishay General Semiconductor. The DO-204AL package is mechanically compatible with DO-41 footprints. This part is suitable for long-term design continuity.

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