S1A R3G Equivalent & Substitute Parts

Part Overview

The S1A R3G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 50 V DC reverse voltage and 1 A average rectified current in a DO-214AC (SMA) surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design and procurement requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with acceptable parameter variations within standard rectifier diode tolerances.

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)	1.5	µs
Current - Reverse Leakage @ Vr	1	µA @ 50 V
Capacitance @ Vr, F	12	pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-55 to 175	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the S1A R3G is determined by the following critical parameters:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V minimum
Current - Average Rectified (Io): 1 A minimum
Voltage - Forward (Vf) (Max) @ If: 1.1 V or lower at 1 A
Operating Temperature - Junction: -55°C minimum to 150°C minimum

Mechanical Compatibility Criteria:

Package / Case: DO-214AC (SMA) for direct pin-compatible substitution
Mounting Type: Surface Mount
MSL Rating: 1 (Unlimited)

Compliance Requirements:

RoHS3 Compliant
ECCN: EAR99
HTSUS: 8541.10.0080

Parts are grouped into two categories:

Parametric Equivalents: Parts that match all critical electrical parameters and package specifications of the S1A R3G, enabling direct substitution without circuit redesign.

Similar Parts: Parts that meet the core voltage and current requirements but may differ in secondary parameters such as recovery time, forward voltage, reverse leakage current, or package variant (SMB vs. SMA). These require verification of circuit tolerance to parameter variations.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [µs/ns]	Ir @ Vr [µA]	C @ Vr [pF]	Package	Tj (°C)	Product Status
S1A R3G	Taiwan Semiconductor Corporation	50	1	1.1 @ 1A	1.5 µs	1 @ 50V	12 @ 4V	DO-214AC (SMA)	-55 to 175	Discontinued
S1A	YAGEO	50	1	1.1 @ 1A	—	—	—	DO-214AC (SMA)	—	Active
S1AH	Taiwan Semiconductor Corporation	50	1	1.1 @ 1A	1.5 µs	1 @ 50V	12 @ 4V	DO-214AC (SMA)	-55 to 175	Active
CGRA4001-G	Comchip Technology	50	1	1.1 @ 1A	—	5 @ 50V	—	DO-214AC (SMA)	-55 to 150	Active
ES1A-13-F	Diodes Incorporated	50	1	0.92 @ 1A	25 ns	5 @ 50V	10 @ 4V	DO-214AC (SMA)	-55 to 150	Active
GS2A-LTP	Micro Commercial Co	50	2	1.1 @ 2A	—	5 @ 50V	20 @ 4V	DO-214AC (SMA)	-55 to 150	Active
RS1A-13-F	Diodes Incorporated	50	1	1.3 @ 1A	150 ns	5 @ 50V	15 @ 4V	DO-214AC (SMA)	-65 to 150	Active
RS1AB-13-F	Diodes Incorporated	50	1	1.3 @ 1A	150 ns	5 @ 50V	15 @ 4V	DO-214AA (SMB)	-65 to 150	Active
S1A-13-F	Diodes Incorporated	50	1	1.1 @ 1A	3 µs	5 @ 50V	10 @ 4V	DO-214AC (SMA)	-65 to 150	Active
S1AB-13-F	Diodes Incorporated	50	1	1.1 @ 1A	3 µs	5 @ 50V	10 @ 4V	DO-214AA (SMB)	-65 to 150	Active
US1A-13-F	Diodes Incorporated	50	1	1.0 @ 1A	50 ns	5 @ 50V	20 @ 4V	DO-214AC (SMA)	-65 to 150	Active

Engineering Selection Recommendations

Direct Substitutes (Parametric Equivalents):

The S1AH manufactured by Taiwan Semiconductor Corporation is a parametric equivalent to the S1A R3G. It maintains identical electrical specifications (50 V, 1 A, 1.1 V forward voltage, 1.5 µs recovery time) and package configuration (DO-214AC SMA). The S1AH is currently active in production and carries AEC-Q101 automotive qualification, providing enhanced reliability for applications requiring automotive-grade components. Both parts are ROHS3 compliant with MSL 1 rating.

The S1A manufactured by YAGEO is a parametric equivalent offering the same voltage, current, and forward voltage ratings in DO-214AC SMA packaging. This part is active and available in high volume, suitable for general-purpose rectification applications.

Compatible Substitutes (Same Package, Matched Electrical Performance):

The S1A-13-F manufactured by Diodes Incorporated provides direct package compatibility (DO-214AC SMA) with matched voltage (50 V), current (1 A), and forward voltage (1.1 V @ 1 A) specifications. The reverse recovery time is 3 µs compared to 1.5 µs in the original part, representing a slower recovery characteristic acceptable in standard rectification circuits. This part is active with high inventory availability.

The US1A-13-F manufactured by Diodes Incorporated offers superior forward voltage performance (1.0 V @ 1 A) and fast recovery characteristics (50 ns), maintaining the same 50 V, 1 A ratings in DO-214AC SMA packaging. This part is suitable for applications where lower forward voltage drop and faster switching are beneficial.

The ES1A-13-F manufactured by Diodes Incorporated provides fast recovery operation (25 ns) with lower forward voltage (0.92 V @ 1 A), maintaining 50 V, 1 A specifications in DO-214AC SMA packaging. This part is recommended for high-frequency rectification applications.

Package Variant Substitutes (SMB Package):

The S1AB-13-F and RS1AB-13-F manufactured by Diodes Incorporated provide equivalent electrical performance in DO-214AA (SMB) surface mount packaging. These parts require PCB layout modification to accommodate the larger SMB footprint but offer the same electrical functionality. Both are active with substantial inventory.

Higher Current Rating Alternative:

The GS2A-LTP manufactured by Micro Commercial Co provides 2 A current rating in DO-214AC SMA packaging with 50 V voltage rating. This part is suitable for applications requiring higher current capacity while maintaining the same package footprint.

Selection Basis:

All recommended substitutes are ROHS3 compliant, carry MSL 1 rating, and share the same ECCN and HTSUS classifications as the original part. Selection should be based on application requirements for recovery speed, forward voltage characteristics, and current capacity. Parts with active production status and high inventory availability are preferred for supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the S1AH directly replace the S1A R3G without circuit modification?

A: Yes. The S1AH is a parametric equivalent with identical voltage (50 V), current (1 A), forward voltage (1.1 V @ 1 A), and recovery time (1.5 µs) specifications. Both use DO-214AC SMA packaging with identical pinout and thermal characteristics. No circuit redesign is required.

Q: What is the difference between the S1A-13-F and the original S1A R3G?

A: The S1A-13-F maintains the same 50 V, 1 A, and 1.1 V forward voltage ratings in identical DO-214AC SMA packaging. The primary difference is recovery time: 3 µs versus 1.5 µs. This slower recovery is acceptable in standard rectification circuits but may affect performance in high-frequency switching applications above 100 kHz.

Q: Can I use the S1AB-13-F as a substitute if my PCB layout uses SMA footprints?

A: No. The S1AB-13-F uses DO-214AA (SMB) packaging, which has a different footprint than DO-214AC (SMA). PCB layout modification is required. If SMA packaging is mandatory, use S1A-13-F, US1A-13-F, or ES1A-13-F instead.

Q: What is the advantage of the US1A-13-F over the S1A-13-F?

A: The US1A-13-F offers lower forward voltage (1.0 V @ 1 A versus 1.1 V) and significantly faster recovery (50 ns versus 3 µs). These characteristics reduce power dissipation and enable operation in higher-frequency circuits. Both maintain 50 V, 1 A ratings in DO-214AC SMA packaging.

Q: Is the GS2A-LTP suitable for 1 A applications?

A: Yes. The GS2A-LTP is rated for 2 A maximum current, so it operates safely at 1 A. The 50 V voltage rating and DO-214AC SMA package match the original part. However, the higher current rating does not provide additional benefit for 1 A applications and may increase cost.

Q: What does "parametric equivalent" mean in this context?

A: A parametric equivalent part matches all critical electrical specifications (voltage, current, forward voltage, recovery time) and mechanical specifications (package, pinout, thermal rating) of the original part. It can be used as a direct replacement without circuit modification or performance degradation.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All parts listed in this reference are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. All share the same ECCN (EAR99) and HTSUS (8541.10.0080) classifications as the original S1A R3G.

Q: Which substitute offers the best availability?

A: The S1A-13-F manufactured by Diodes Incorporated has the highest inventory (100,300 pieces) among active substitutes. The S1AB-13-F (39,697 pieces) and RS1A-13-F (10,400 pieces) also provide substantial availability.

Q: Can I use the CGRA4001-G as a substitute?

A: The CGRA4001-G meets the 50 V, 1 A, and 1.1 V forward voltage requirements in DO-214AC SMA packaging. However, the reverse leakage current is 5 µA compared to 1 µA in the original part, and the maximum junction temperature is -55°C to 150°C versus -55°C to 175°C. This part is suitable for applications where the higher leakage current and lower temperature rating are acceptable.

Q: What is the difference between standard recovery and fast recovery diodes?

A: Standard recovery diodes (S1A R3G, S1A-13-F) have recovery times greater than 500 ns, suitable for 50 Hz to 100 kHz rectification. Fast recovery diodes (ES1A-13-F with 25 ns, US1A-13-F with 50 ns) are designed for high-frequency switching applications above 100 kHz. Fast recovery diodes typically exhibit lower forward voltage and reduced switching losses.

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