SS310 R7G General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The SS310 R7G is a general purpose rectifier diode rated for 100 V DC reverse voltage and 3 A average rectified current in a DO-214AB (SMC) surface mount package. This component is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers. The part operates across a junction temperature range of -55°C to 150°C and complies with RoHS3 and REACH regulations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	100	µA @ 100 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SS310 R7G is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 100 V minimum
Current - Average Rectified (Io): 3 A minimum
Mounting Type: Surface Mount
Package / Case: DO-214AB or SMC equivalent
Speed Classification: Fast Recovery (≤ 500ns, > 200mA)
Operating Temperature Range: -55°C to 150°C minimum
RoHS3 Compliance: Required

Acceptable Parameter Variations:

Forward Voltage (Vf): Substitute parts may range from 850 mV to 1000 mV @ 3 A without functional impact
Reverse Leakage Current: Substitute parts with 5 µA to 100 µA @ 100 V are acceptable
Reverse Recovery Time (trr): Substitute parts with 25 ns to 50 ns meet fast recovery classification

Parts that exceed the 3 A current rating (such as 5 A devices) are listed as similar alternatives but introduce design margin considerations and are not direct equivalents.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Speed	Ir @ Vr [µA]	Tj (Max) [°C]	Product Status
SS310 R7G	Taiwan Semiconductor Corporation	100	3	850 @ 3A	Fast Recovery ≤ 500ns	100 @ 100V	150	Discontinued
SS310 V7G	Taiwan Semiconductor Corporation	100	3	850 @ 3A	Fast Recovery ≤ 500ns	100 @ 100V	150	Discontinued
CSFC302-G	Comchip Technology	100	3	950 @ 3A	Fast Recovery ≤ 500ns	5 @ 100V	150	Active
CURC302-G	Comchip Technology	100	3	1000 @ 3A	Fast Recovery ≤ 500ns	5 @ 100V	150	Active
ES3B	Taiwan Semiconductor Corporation	100	3	950 @ 3A	Fast Recovery ≤ 500ns	10 @ 100V	150	Active
ES3B-13-F	Diodes Incorporated	100	3	900 @ 3A	Fast Recovery ≤ 500ns	10 @ 100V	150	Active
ES3B-E3/57T	Vishay General Semiconductor - Diodes Division	100	3	900 @ 3A	Fast Recovery ≤ 500ns	10 @ 100V	150	Active
ES3B-E3/9AT	Vishay General Semiconductor - Diodes Division	100	3	900 @ 3A	Fast Recovery ≤ 500ns	10 @ 100V	150	Active
ES3B-M3/57T	Vishay General Semiconductor - Diodes Division	100	3	900 @ 3A	Fast Recovery ≤ 500ns	10 @ 100V	150	Active
ES3B-M3/9AT	Vishay General Semiconductor - Diodes Division	100	3	900 @ 3A	Fast Recovery ≤ 500ns	10 @ 100V	150	Active
CGRC502-G	Comchip Technology	100	5	1150 @ 5A	Standard Recovery > 500ns	10 @ 100V	150	Active

Engineering Selection Recommendations

Direct Equivalents (Active Status):

The following parts are functionally equivalent to the SS310 R7G and are currently in active production:

ES3B-13-F (Diodes Incorporated): Meets all electrical specifications with forward voltage of 900 mV @ 3 A and reverse leakage of 10 µA @ 100 V. Available in Tape & Reel packaging with 10,100 pieces in stock.
ES3B-E3/9AT (Vishay General Semiconductor - Diodes Division): Meets all electrical specifications with forward voltage of 900 mV @ 3 A. Available in Tape & Reel packaging with 4,742 pieces in stock.
ES3B-E3/57T (Vishay General Semiconductor - Diodes Division): Meets all electrical specifications with forward voltage of 900 mV @ 3 A. Available in Cut Tape packaging with 5,730 pieces in stock.
ES3B (Taiwan Semiconductor Corporation): Meets all electrical specifications with forward voltage of 950 mV @ 3 A and includes capacitance specification of 45 pF @ 4 V, 1 MHz. Available with 10,400 pieces in stock.

Alternative Equivalents (Active Status):

CSFC302-G (Comchip Technology): Meets all electrical specifications with forward voltage of 950 mV @ 3 A and reverse leakage of 5 µA @ 100 V. Available in Tape & Reel packaging with 800 pieces in stock.
CURC302-G (Comchip Technology): Meets all electrical specifications with forward voltage of 1000 mV @ 3 A and reverse leakage of 5 µA @ 100 V. Available in Tape & Reel packaging with 687 pieces in stock.

Compliance Status:

All recommended substitute parts are RoHS3 compliant, REACH unaffected, and classified as MSL 1 (Unlimited moisture sensitivity level). All parts are classified under ECCN EAR99 and HTSUS 8541.10.0080.

Similar Alternative (Higher Current Rating):

CGRC502-G (Comchip Technology): Rated for 100 V and 5 A (exceeds 3 A requirement). Forward voltage is 1.15 V @ 5 A. Speed classification is Standard Recovery (> 500ns), which differs from the fast recovery specification of the SS310 R7G. This part introduces additional design margin but is not a direct equivalent due to different speed characteristics.

Frequently Asked Questions (FAQ)

Q: Can I use ES3B-13-F as a direct replacement for SS310 R7G?

A: Yes. The ES3B-13-F meets all electrical and mechanical requirements of the SS310 R7G. Both are rated for 100 V reverse voltage, 3 A average rectified current, and operate in the -55°C to 150°C temperature range. The forward voltage of 900 mV @ 3 A is within acceptable variation from the original 850 mV specification. Both are RoHS3 compliant and use the DO-214AB (SMC) package.

Q: What is the difference between the Vishay ES3B variants (E3/57T, E3/9AT, M3/57T, M3/9AT)?

A: The electrical specifications are identical across all Vishay ES3B variants. The differences are in packaging format: E3/57T and E3/9AT are available in Cut Tape (CT) and Tape & Reel (TR) formats respectively, while M3/57T and M3/9AT follow the same packaging convention. Selection depends on assembly process requirements and tape configuration compatibility.

Q: Why is CGRC502-G listed as a similar alternative rather than a direct equivalent?

A: The CGRC502-G is rated for 5 A average rectified current, which exceeds the 3 A requirement of the SS310 R7G. Additionally, its speed classification is Standard Recovery (> 500ns) rather than Fast Recovery (≤ 500ns). While the higher current rating provides design margin, the different speed characteristic makes it a similar alternative rather than a direct equivalent. Use this part only if circuit design accommodates the different recovery time.

Q: Are all substitute parts available in the same packaging format as the SS310 R7G?

A: All substitute parts use the DO-214AB (SMC) surface mount package, which is mechanically compatible with the SS310 R7G. However, packaging formats (Cut Tape, Tape & Reel, or bulk) vary by manufacturer and part number. Verify packaging format compatibility with your assembly process before procurement.

Q: What is the significance of the forward voltage difference between SS310 R7G (850 mV) and ES3B variants (900 mV)?

A: The 50 mV difference in forward voltage at 3 A is within normal manufacturing tolerance for rectifier diodes and does not affect circuit functionality in typical applications. This variation is acceptable for general purpose rectification applications. For precision applications with tight voltage regulation requirements, circuit simulation or prototype testing is appropriate to confirm performance.

Q: Can I substitute a higher current rated diode (5 A) in place of the 3 A SS310 R7G?

A: Higher current rated diodes are mechanically compatible in the same package but introduce additional design margin. The CGRC502-G (5 A rating) is available; however, its Standard Recovery speed classification differs from the SS310 R7G Fast Recovery specification. Use higher current rated parts only if circuit design requirements accommodate the different electrical characteristics.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference are RoHS3 compliant and REACH unaffected. All parts are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: What inventory levels are available for the recommended substitutes?

A: ES3B (Taiwan Semiconductor Corporation) has the highest inventory at 10,400 pieces. ES3B-13-F (Diodes Incorporated) has 10,100 pieces. ES3B-E3/57T (Vishay) has 5,730 pieces. CSFC302-G (Comchip Technology) has 800 pieces. CURC302-G (Comchip Technology) has 687 pieces. Inventory levels should be verified at time of procurement.

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