Equivalent & Substitute Parts for S1A-TP General Purpose Rectifier Diode

Part Overview

The S1A-TP is a general purpose rectifier diode manufactured by Micro Commercial Co, rated for 50 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AA (SMB) package. This component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and procurement needs. The part operates across a junction temperature range of -55°C to 150°C and complies with RoHS3 and REACH standards.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	V
Reverse Recovery Time (trr)	2	µs
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Capacitance @ Vr, F	12	pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the S1A-TP is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 50 V
Package / Case: Must be DO-214AA or SMB equivalent
Mounting Type: Must be Surface Mount
Operating Temperature Range: Must accommodate -55°C to 150°C junction temperature

Secondary Compatibility Factors:

Current - Average Rectified (Io): Rated current must meet or exceed application requirements
Voltage - Forward (Vf): Forward voltage drop characteristics must be compatible with circuit design
Reverse Recovery Time (trr): Recovery speed classification must be compatible with application switching frequency
RoHS and REACH Compliance: Regulatory status must align with end-product requirements

Substitute parts are grouped into two categories: Parametric Equivalent (matching all primary electrical specifications) and Similar (meeting primary criteria with enhanced or modified secondary parameters).

Parameter Comparison

Parameter	S1A-TP (Main)	S1A_R1_00001 (Parametric Equivalent)	S2A/54 (Similar)	CURB201-G (Similar)
Manufacturer	Micro Commercial Co	Panjit International Inc.	Vishay General Semiconductor	Comchip Technology
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	1 A	1 A	1.5 A	2 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	1.1 V @ 1 A	1.15 V @ 1.5 A	1 V @ 2 A
Speed Classification	Standard Recovery >500ns	Standard Recovery >500ns	Standard Recovery >500ns	Fast Recovery ≤500ns
Reverse Recovery Time (trr)	2 µs	Not specified	2 µs	50 ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V	1 µA @ 50 V	1 µA @ 50 V	5 µA @ 50 V
Capacitance @ Vr, F	12 pF @ 4V, 1MHz	12 pF @ 4V, 1MHz	16 pF @ 4V, 1MHz	Not specified
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature - Junction	-55 to 150°C	-55 to 150°C	-55 to 150°C	150°C (Max)
Product Status	Discontinued at DiGi Electronics	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Not specified	1 (Unlimited)
Inventory Status	910 Pcs New Original	1764 Pcs New Original	976 Pcs New Original	991 Pcs New Original

Engineering Selection Recommendations

Parametric Equivalent Selection:

The S1A_R1_00001 manufactured by Panjit International Inc. is a parametric equivalent to the S1A-TP. This part maintains identical electrical specifications including 50 V reverse voltage rating, 1 A average rectified current, 1.1 V forward voltage drop at 1 A, and standard recovery speed characteristics. The S1A_R1_00001 is rated for the same operating temperature range (-55°C to 150°C), complies with RoHS3 and REACH standards, and is packaged in the identical DO-214AA SMB format. This part is currently active in production with 1764 units in stock, providing immediate availability for direct replacement applications.

Similar Part Selection - Higher Current Rating:

The S2A/54 manufactured by Vishay General Semiconductor provides a 1.5 A average rectified current rating while maintaining the 50 V reverse voltage specification and DO-214AA SMB package. This part is suitable for applications requiring higher current capacity than the original 1 A specification. The S2A/54 exhibits identical standard recovery speed characteristics and 2 µs reverse recovery time. However, this part carries RoHS non-compliant status, which may restrict use in regulated end-product applications. The operating temperature range matches the original specification at -55°C to 150°C.

Similar Part Selection - Fast Recovery, Higher Current:

The CURB201-G manufactured by Comchip Technology provides a 2 A average rectified current rating with fast recovery characteristics (≤500ns, 50 ns reverse recovery time). This part maintains the 50 V reverse voltage rating and DO-214AA SMB package compatibility. The CURB201-G is RoHS3 compliant and actively produced. The operating temperature maximum is specified at 150°C without a minimum temperature specification. Fast recovery speed is suitable for higher frequency switching applications where the original standard recovery speed is insufficient.

Compliance Considerations:

For applications requiring RoHS3 compliance, the S1A_R1_00001 and CURB201-G are suitable selections. The S2A/54 is not recommended for RoHS-regulated applications due to non-compliant status. All three substitute parts maintain REACH unaffected status consistent with the original S1A-TP.

Frequently Asked Questions (FAQ)

Q: Can the S1A_R1_00001 be used as a direct replacement for the S1A-TP?

A: Yes. The S1A_R1_00001 is a parametric equivalent with identical electrical specifications (50 V, 1 A, 1.1 V forward voltage, standard recovery speed) and identical package format (DO-214AA SMB). Both parts operate across -55°C to 150°C and comply with RoHS3 standards. No circuit modifications are required.

Q: What is the difference between the S2A/54 and the original S1A-TP?

A: The S2A/54 has a higher current rating of 1.5 A compared to the S1A-TP's 1 A rating. Both maintain 50 V reverse voltage and DO-214AA SMB packaging. The S2A/54 has a slightly higher forward voltage drop (1.15 V @ 1.5 A versus 1.1 V @ 1 A) and identical standard recovery speed. The S2A/54 is RoHS non-compliant, whereas the S1A-TP is RoHS3 compliant.

Q: When should the CURB201-G be selected instead of the S1A_R1_00001?

A: The CURB201-G is selected when the application requires fast recovery speed (≤500ns) or higher current capacity (2 A). The CURB201-G has a 50 ns reverse recovery time compared to the S1A-TP's 2 µs, making it suitable for high-frequency switching circuits. The CURB201-G is RoHS3 compliant and actively produced.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All substitute parts (S1A_R1_00001, S2A/54, and CURB201-G) are packaged in DO-214AA SMB format, identical to the S1A-TP. All are surface mount components suitable for automated assembly processes.

Q: What is the impact of reverse recovery time differences between these parts?

A: Reverse recovery time (trr) affects switching speed and switching losses. The S1A-TP and S2A/54 have 2 µs recovery time (standard recovery), while the CURB201-G has 50 ns (fast recovery). Fast recovery reduces switching losses in high-frequency applications but may introduce different EMI characteristics. Standard recovery parts are suitable for low-frequency rectification applications.

Q: Can the S2A/54 be used in applications designed for the S1A-TP?

A: The S2A/54 can be used in applications where the higher 1.5 A current rating does not create design conflicts. However, RoHS compliance status must be verified against end-product requirements. The slightly higher forward voltage drop (1.15 V versus 1.1 V) may affect circuit performance in voltage-sensitive applications.

Q: What is the moisture sensitivity level for all substitute parts?

A: The S1A_R1_00001 and CURB201-G both have MSL 1 (Unlimited), identical to the S1A-TP. The S2A/54 moisture sensitivity level is not specified in the provided data.

Q: Are there temperature range differences between the substitute parts?

A: The S1A_R1_00001 and S2A/54 operate across -55°C to 150°C, matching the S1A-TP. The CURB201-G specifies a maximum junction temperature of 150°C without a minimum temperature specification, which may limit use in extreme low-temperature environments.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message