S2AB-HF Equivalent & Substitute Parts

Part Overview

The S2AB-HF is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 50 V DC reverse voltage and 2 A average rectified current in a surface mount SMB/DO-214AA package. This component is classified as Active product status and complies with RoHS3 standards. Substitute parts are identified when equivalent electrical characteristics and mechanical compatibility are maintained across the specified parameter range, enabling seamless integration into existing designs without circuit redesign.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1.1 @ 2 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the S2AB-HF are identified based on strict equivalence of electrical and mechanical parameters. The substitution criteria are:

Voltage Rating: DC reverse voltage (Vr) must equal 50 V maximum
Current Rating: Average rectified current (Io) must equal 2 A
Forward Voltage: Maximum forward voltage (Vf) at rated current must not exceed 1.1 V @ 2 A
Recovery Speed: Standard recovery characteristics with >500 ns recovery time at >200 mA
Package Compatibility: Surface mount SMB/DO-214AA package required
Temperature Range: Operating junction temperature range must span -55°C to 150°C minimum
Compliance: RoHS3 compliance required

The S2A_R1_00001 manufactured by Panjit International Inc. meets all substitution criteria and is classified as a parametric equivalent.

Parameter Comparison

Parameter	S2AB-HF (Comchip)	S2A_R1_00001 (Panjit)	Match Status
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	Equivalent
Current - Average Rectified (Io)	2 A	2 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 2 A	1.1 V @ 2 A	Equivalent
Speed	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Equivalent
Current - Reverse Leakage @ Vr	5 µA @ 50 V	1 µA @ 50 V	Compatible (Lower leakage)
Capacitance @ Vr, F	25 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz	Compatible (Within tolerance)
Package / Case	DO-214AA, SMB	DO-214AA, SMB	Equivalent
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

Both the S2AB-HF and S2A_R1_00001 are Active product status components with full RoHS3 compliance and identical electrical ratings. Selection between these parts is based on availability and supply chain requirements:

S2AB-HF (Comchip Technology): 678 pieces in stock. Primary selection for immediate procurement.
S2A_R1_00001 (Panjit International Inc.): 1317 pieces in stock. Alternative selection offering higher inventory availability and lower reverse leakage current (1 µA versus 5 µA), which may provide marginal performance benefits in low-leakage applications.

Both components are suitable for direct substitution in rectification circuits operating within the specified voltage and current parameters. No circuit modifications are required when switching between these parts.

Frequently Asked Questions (FAQ)

Q: Can S2A_R1_00001 be used as a direct replacement for S2AB-HF?

A: Yes. Both parts share identical voltage ratings (50 V), current ratings (2 A), forward voltage characteristics (1.1 V @ 2 A), recovery speed, package type (SMB/DO-214AA), and operating temperature range (-55°C to 150°C). Direct substitution is supported without circuit redesign.

Q: What is the difference in reverse leakage current between these parts?

A: The S2AB-HF specifies 5 µA reverse leakage at 50 V, while the S2A_R1_00001 specifies 1 µA at the same conditions. The S2A_R1_00001 exhibits lower leakage, which is compatible with the S2AB-HF specification and does not create substitution conflicts.

Q: Are the capacitance values different, and does this affect substitution?

A: The S2AB-HF specifies 25 pF at 4 V, 1 MHz, while the S2A_R1_00001 specifies 30 pF at the same conditions. This 5 pF difference is within normal manufacturing tolerance for general-purpose rectifier diodes and does not prevent substitution in standard rectification applications.

Q: Do both parts have the same package footprint?

A: Yes. Both components use the SMB/DO-214AA surface mount package with identical mechanical dimensions and land pattern compatibility. PCB layout modifications are not required when substituting between these parts.

Q: Are there any compliance or certification differences?

A: Both parts are RoHS3 compliant with MSL Level 1 (Unlimited moisture sensitivity). No compliance barriers exist for substitution.

Q: Which part should be selected for new designs?

A: Either part is acceptable for new designs. Selection should be based on supplier availability, lead time, and inventory status. The S2A_R1_00001 offers higher stock availability (1317 pieces versus 678 pieces) and lower reverse leakage characteristics.

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