RS1AH Equivalent & Substitute Parts

Part Overview

The RS1AH is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 50 V DC reverse voltage and 1 A average rectified current. The device is packaged in DO-214AC (SMA) surface mount configuration and features fast recovery characteristics with a reverse recovery time of 150 ns. The RS1AH maintains Active product status and carries AEC-Q101 automotive qualification, ROHS3 compliance, and unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and manufacturing optimization while maintaining electrical and mechanical compatibility within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 1 A	V
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Capacitance @ Vr, F	10	pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the RS1AH are identified based on strict parametric equivalence across the following critical criteria:

Electrical Parameters (Must Match):

Voltage - DC Reverse (Vr) (Max): 50 V
Current - Average Rectified (Io): 1 A
Voltage - Forward (Vf) (Max) @ If: 1.3 V @ 1 A
Reverse Recovery Time (trr): 150 ns
Speed Classification: Fast Recovery ≤ 500 ns, > 200 mA (Io)

Mechanical Parameters (Must Match):

Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount

Compliance & Environmental (Must Match):

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)
REACH Status: REACH Unaffected
Operating Temperature Range: -55°C to 150°C

Substitute parts are grouped into a single equivalence class because all identified substitutes maintain identical electrical ratings, mechanical packaging, and compliance certifications. Variations in reverse leakage current (1 µA to 5 µA @ 50 V) and junction capacitance (10 pF to 12 pF @ 4V, 1 MHz) remain within acceptable tolerance ranges for general-purpose rectification applications and do not disqualify substitution.

Parameter Comparison

Parameter	RS1AH (Main)	RS1A	RS1A-E3/5AT	RS1A-E3/61T	RS1A_R1_00001
Manufacturer	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Panjit International Inc.
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1 A	1.3 V @ 1 A	1.3 V @ 1 A	1.3 V @ 1 A	1.3 V @ 1 A
Reverse Recovery Time (trr)	150 ns	150 ns	150 ns	150 ns	150 ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V	1 µA @ 50 V
Capacitance @ Vr, F	10 pF @ 4V, 1MHz	10 pF @ 4V, 1MHz	10 pF @ 4V, 1MHz	10 pF @ 4V, 1MHz	12 pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C
Technology	Standard	Standard	Standard	Standard	Standard
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All identified substitute parts maintain full parametric equivalence to the RS1AH across critical electrical and mechanical specifications. Selection among equivalent parts is based on the following engineering considerations:

Manufacturer Availability & Supply Chain: RS1A (Taiwan Semiconductor Corporation) offers the highest inventory level at 22,800 pieces, providing optimal supply chain continuity. RS1A_R1_00001 (Panjit International Inc.) provides an alternative source with 2,823 pieces in stock. Vishay General Semiconductor options (RS1A-E3/5AT and RS1A-E3/61T) offer 7,690 and 5,232 pieces respectively, supporting multi-source procurement strategies.

Compliance & Qualification: All substitute parts maintain ROHS3 compliance, REACH Unaffected status, and unlimited moisture sensitivity level (MSL 1). The RS1AH carries AEC-Q101 automotive qualification; equivalent parts should be cross-referenced for automotive qualification status in applications requiring automotive-grade components.

Packaging Considerations: The RS1AH is supplied in standard packaging configuration. RS1A is available in Tape & Reel (TR) format. RS1A-E3/5AT and RS1A-E3/61T are available in Cut Tape (CT) & Digi-Reel® format. RS1A_R1_00001 is supplied in Tape & Reel (TR) format. Packaging selection depends on manufacturing process requirements and assembly equipment compatibility.

Electrical Performance: RS1A_R1_00001 exhibits lower reverse leakage current (1 µA @ 50 V versus 5 µA @ 50 V) and slightly higher junction capacitance (12 pF versus 10 pF @ 4V, 1 MHz). These variations remain within acceptable tolerance ranges for general-purpose rectification and do not impact functional compatibility in standard applications.

Frequently Asked Questions (FAQ)

Q: Can RS1A be used as a direct replacement for RS1AH?

A: Yes. RS1A is a parametric equivalent with identical electrical ratings (50 V, 1 A, 150 ns reverse recovery time), forward voltage characteristics (1.3 V @ 1 A), and DO-214AC SMA surface mount packaging. Both parts maintain ROHS3 compliance and unlimited moisture sensitivity level. The primary difference is packaging format: RS1A is supplied in Tape & Reel (TR) configuration, while RS1AH uses standard packaging.

Q: What are the key differences between Vishay RS1A-E3/5AT and RS1A-E3/61T?

A: Both Vishay parts are parametric equivalents with identical electrical specifications and DO-214AC SMA packaging. The designations RS1A-E3/5AT and RS1A-E3/61T represent different packaging tape configurations (Cut Tape & Digi-Reel® format). Electrical performance and mechanical compatibility are identical. Selection depends on assembly equipment compatibility and manufacturing process requirements.

Q: Is RS1A_R1_00001 suitable for automotive applications?

A: RS1A_R1_00001 maintains identical electrical ratings and DO-214AC SMA packaging as the RS1AH. However, automotive qualification status must be verified independently. The RS1AH carries AEC-Q101 qualification; RS1A_R1_00001 qualification status should be confirmed with Panjit International Inc. for automotive-grade applications.

Q: How do reverse leakage current variations affect substitution?

A: RS1A_R1_00001 exhibits 1 µA reverse leakage current @ 50 V, while RS1AH, RS1A, RS1A-E3/5AT, and RS1A-E3/61T specify 5 µA @ 50 V. This 4 µA difference remains within acceptable tolerance ranges for general-purpose rectification applications and does not disqualify substitution. Applications with stringent leakage requirements should specify RS1A_R1_00001.

Q: Are all substitute parts RoHS compliant?

A: Yes. All identified substitute parts (RS1A, RS1A-E3/5AT, RS1A-E3/61T, and RS1A_R1_00001) maintain ROHS3 compliance and REACH Unaffected status, matching the RS1AH compliance profile.

Q: What is the significance of MSL 1 (Unlimited) rating?

A: Moisture Sensitivity Level 1 (Unlimited) indicates that the component does not require moisture-sensitive device (MSD) handling procedures. All substitute parts carry identical MSL 1 rating, eliminating moisture management considerations during storage, handling, and assembly.

Q: Can packaging format differences affect circuit performance?

A: No. Packaging format differences (Tape & Reel, Cut Tape, Digi-Reel®, or standard packaging) do not affect electrical performance or circuit functionality. These variations address manufacturing and assembly process requirements only. All substitute parts maintain identical DO-214AC SMA mechanical dimensions and surface mount compatibility.

Q: Which substitute part offers the best supply availability?

A: RS1A (Taiwan Semiconductor Corporation) provides the highest inventory level at 22,800 pieces, offering optimal supply chain continuity and shortest lead times for high-volume procurement requirements.

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