S2JA Equivalent & Substitute Parts

Part Overview

The S2JA is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 600 V DC reverse voltage and 1.5 A average rectified current in a surface mount DO-214AC (SMA) package. This component is classified as Active product status and is ROHS3 compliant. The S2JA serves as a standard recovery diode suitable for general rectification applications requiring moderate current capacity and voltage ratings.

Substitute parts become necessary when the primary part number reaches end-of-life status, experiences supply constraints, or when design requirements permit operation with alternative electrical characteristics within acceptable tolerance ranges. The substitute parts listed maintain the same voltage rating and package form factor while offering variations in current capacity, forward voltage drop, and recovery characteristics.

Key Parameters

Parameter	S2JA Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1.1 @ 1.5	V @ A
Reverse Recovery Time (trr)	1.5	µs
Current - Reverse Leakage @ Vr	5	µA @ 600 V
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S2JA is determined by the following critical parameters:

Voltage Rating: All substitute parts maintain the 600 V DC reverse voltage specification, ensuring compatibility with the same circuit voltage environment.

Package Form Factor: All substitute parts use the DO-214AC (SMA) surface mount package, maintaining identical PCB footprint and assembly compatibility.

Current Capacity: The S2JA is rated for 1.5 A average rectified current. Substitute parts are grouped into two categories:

Direct Current Equivalents (1.5 A): The S2JA R3G maintains identical 1.5 A current rating with the same electrical characteristics, differing only in packaging format (Cut Tape versus Tape & Reel).
Reduced Current Substitutes (1.0 A): Parts including CSFA105-G, GS1J-LTP, RS1J-13-F, RS1JHE3_A/H, RS1JHE3_A/I, S1J-13-F, S1JHE3_A/H, and S1JHE3_A/I are rated for 1.0 A average rectified current. These parts are suitable for applications where the circuit load does not exceed 1.0 A.

Recovery Characteristics: The S2JA exhibits standard recovery behavior (>500 ns). Substitute parts are available in both standard recovery and fast recovery variants, allowing selection based on switching frequency requirements.

Temperature Range: Operating junction temperature ranges vary between -55°C to 150°C and -65°C to 150°C across the substitute options.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	trr [µs/ns]	Package	Temp Range [°C]	Product Status
S2JA	Taiwan Semiconductor Corporation	600	1.5	1.1 @ 1.5A	1.5 µs	DO-214AC (SMA)	-55 to 150	Active
S2JA R3G	Taiwan Semiconductor Corporation	600	1.5	1.1 @ 1.5A	1.5 µs	DO-214AC (SMA)	-55 to 150	Discontinued at DiGi Electronics
CSFA105-G	Comchip Technology	600	1.0	1.5 @ 1A	35 ns	DO-214AC (SMA)	-55 to 150	Active
GS1J-LTP	Micro Commercial Co	600	1.0	1.0 @ 1A	Standard >500ns	DO-214AC (SMA)	-55 to 150	Active
RS1J-13-F	Diodes Incorporated	600	1.0	1.3 @ 1A	250 ns	DO-214AC (SMA)	-65 to 150	Active
RS1JHE3_A/H	Vishay General Semiconductor - Diodes Division	600	1.0	1.3 @ 1A	250 ns	DO-214AC (SMA)	-55 to 150	Active
RS1JHE3_A/I	Vishay General Semiconductor - Diodes Division	600	1.0	1.3 @ 1A	250 ns	DO-214AC (SMA)	-55 to 150	Active
S1J-13-F	Diodes Incorporated	600	1.0	1.1 @ 1A	3 µs	DO-214AC (SMA)	-65 to 150	Active
S1JB-13-F	Diodes Incorporated	600	1.0	1.1 @ 1A	3 µs	DO-214AA (SMB)	-65 to 150	Active
S1JHE3_A/H	Vishay General Semiconductor - Diodes Division	600	1.0	1.1 @ 1A	1.8 µs	DO-214AC (SMA)	-55 to 150	Active
S1JHE3_A/I	Vishay General Semiconductor - Diodes Division	600	1.0	1.1 @ 1A	1.8 µs	DO-214AC (SMA)	-55 to 150	Active

Engineering Selection Recommendations

Direct Replacement (1.5 A Current Requirement):

The S2JA R3G is the only substitute maintaining the full 1.5 A current rating. However, this part is listed as Discontinued at DiGi Electronics, limiting its availability for new designs. Selection of this part is appropriate only when existing inventory is available and supply continuity is confirmed.

Reduced Current Substitutes (1.0 A Maximum):

For applications where circuit load does not exceed 1.0 A, the following active parts are available:

GS1J-LTP (Micro Commercial Co): Maintains standard recovery characteristics matching the S2JA recovery profile. Forward voltage is optimized at 1.0 V @ 1 A, offering lower power dissipation compared to the S2JA.
S1J-13-F and S1JHE3_A/H / S1JHE3_A/I (Diodes Incorporated and Vishay): Offer forward voltage of 1.1 V @ 1 A, matching the S2JA forward voltage specification. The Vishay variants include AEC-Q101 automotive qualification and lower reverse leakage (1 µA @ 600 V).
RS1J-13-F, RS1JHE3_A/H, and RS1JHE3_A/I (Diodes Incorporated and Vishay): Provide fast recovery characteristics (250 ns) suitable for higher frequency switching applications. Vishay variants include AEC-Q101 automotive qualification.
CSFA105-G (Comchip Technology): Offers the fastest recovery time (35 ns) for applications requiring minimal reverse recovery losses.

Packaging Considerations:

The S1JB-13-F uses DO-214AA (SMB) package, which differs from the S2JA DO-214AC (SMA) package. This part is not a direct footprint replacement and requires PCB redesign.

Compliance and Qualification:

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. Vishay variants (RS1JHE3_A/H, RS1JHE3_A/I, S1JHE3_A/H, S1JHE3_A/I) include AEC-Q101 automotive qualification, suitable for automotive and high-reliability applications.

Frequently Asked Questions (FAQ)

Q: Can I use a 1.0 A rated diode in place of the S2JA 1.5 A diode?

A: Substitution is permissible only if the circuit load current does not exceed 1.0 A. The substitute part must be rated for the actual circuit current with appropriate safety margin. Exceeding the rated current of the substitute part results in excessive junction temperature and reduced component reliability.

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

A: Recovery time (trr) defines the interval required for the diode to transition from forward conduction to reverse blocking state. The S2JA exhibits standard recovery (1.5 µs). Fast recovery variants (CSFA105-G at 35 ns, RS1J-13-F at 250 ns) reduce switching losses in high-frequency applications. Standard recovery parts are suitable for line frequency and low-frequency switching applications.

Q: Are the Vishay AEC-Q101 qualified parts suitable for non-automotive applications?

A: Yes. AEC-Q101 qualification indicates compliance with automotive reliability standards and represents a higher qualification level. These parts are suitable for any application, including industrial and consumer applications, and offer enhanced reliability characteristics.

Q: Why does the S1JB-13-F have a different package designation?

A: The S1JB-13-F uses DO-214AA (SMB) package instead of DO-214AC (SMA). These packages have different physical dimensions and PCB footprints. The SMB package is larger and not compatible with SMA footprints without PCB redesign.

Q: What is the significance of forward voltage (Vf) differences between substitute parts?

A: Forward voltage determines power dissipation in the diode during conduction. Lower Vf results in reduced heat generation. The S2JA specifies 1.1 V @ 1.5 A. Substitute parts with lower Vf (such as GS1J-LTP at 1.0 V @ 1 A) offer improved efficiency, while parts with higher Vf (such as CSFA105-G at 1.5 V @ 1 A) generate additional heat. Selection depends on thermal design constraints.

Q: Can I substitute the S2JA with a part rated for lower reverse voltage?

A: No. The reverse voltage rating must equal or exceed the S2JA 600 V specification. Using a part with lower voltage rating results in diode breakdown and circuit failure when exposed to the full circuit voltage.

Q: What does MSL 1 (Unlimited) moisture sensitivity mean?

A: MSL 1 indicates the component has unlimited shelf life and does not require special moisture control during storage or handling. All listed substitute parts carry MSL 1 rating, eliminating moisture-related reliability concerns.

Q: Are there any temperature range limitations when selecting a substitute?

A: The S2JA operates from -55°C to 150°C junction temperature. Some substitute parts extend the lower temperature limit to -65°C (RS1J-13-F, S1J-13-F, S1JB-13-F). Parts with -65°C rating are suitable for all applications requiring the S2JA temperature range. Parts with -55°C rating match the S2JA specification exactly.

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