SS320 R7G Equivalent & Substitute Parts

Part Overview

The SS320 R7G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 200 V DC reverse voltage and 3 A average rectified current in a surface mount DO-214AB (SMC) package. This component is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement requirements. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while conforming to the same package standard and regulatory compliance requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 3 A	mV @ A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	100	µA @ 200 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 eligibility for the SS320 R7G is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 200 V minimum
Current - Average Rectified (Io): 3 A minimum
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Package / Case: DO-214AB, SMC (surface mount)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Secondary Compatibility Factors:

Operating Temperature - Junction: -55°C to 150°C or wider range
Moisture Sensitivity Level (MSL): 1 (Unlimited)
REACH Status: REACH Unaffected

Parts meeting all primary criteria are classified as direct substitutes. Parts exceeding current rating (5 A) or possessing superior performance characteristics (lower forward voltage, faster recovery time) are classified as similar substitutes with enhanced capability. All identified substitutes maintain DO-214AB package compatibility and surface mount configuration, ensuring mechanical and thermal interface equivalence.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV @ A]	Speed	Reverse Recovery Time [ns]	Reverse Leakage @ Vr [µA]	Tj (Max) [°C]	Product Status
SS320 R7G	Taiwan Semiconductor Corporation	200	3	850 @ 3	Fast Recovery ≤ 500ns	—	100 @ 200	150	Discontinued
RS3D-M3/9AT	Vishay General Semiconductor - Diodes Division	200	3	1300 @ 2.5	Fast Recovery ≤ 500ns	150	10 @ 100	150	Active
CFRC303-G	Comchip Technology	200	3	1300 @ 3	Fast Recovery ≤ 500ns	150	5 @ 200	150	Active
CSFC303-G	Comchip Technology	200	3	950 @ 3	Fast Recovery ≤ 500ns	35	5 @ 200	150	Active
CURC303-G	Comchip Technology	200	3	1000 @ 3	Fast Recovery ≤ 500ns	50	5 @ 200	150	Active
ER3D-TP	Micro Commercial Co	200	3	950 @ 3	Fast Recovery ≤ 500ns	35	5 @ 200	175	Active
ES3D	Diotec Semiconductor	200	3	900 @ 3	Fast Recovery ≤ 500ns	20	5 @ 200	150	Active
ES3D-13-F	Diodes Incorporated	200	3	900 @ 3	Fast Recovery ≤ 500ns	25	10 @ 200	150	Active
ES3D-E3/57T	Vishay General Semiconductor - Diodes Division	200	3	900 @ 3	Fast Recovery ≤ 500ns	30	10 @ 200	150	Active
ES3D-E3/9AT	Vishay General Semiconductor - Diodes Division	200	3	900 @ 3	Fast Recovery ≤ 500ns	30	10 @ 200	150	Active

Engineering Selection Recommendations

Direct Substitutes (Equivalent Performance):

The following parts satisfy all primary substitution criteria and maintain electrical equivalence to the SS320 R7G:

ES3D-E3/57T (Vishay General Semiconductor - Diodes Division): Active product status with 79,415 units in stock. Meets all voltage, current, and package specifications. Forward voltage of 900 mV @ 3 A represents improvement over the original 850 mV specification. Reverse recovery time of 30 ns provides enhanced switching performance. ROHS3 compliant with MSL 1 rating.
ES3D-E3/9AT (Vishay General Semiconductor - Diodes Division): Active product status with 110,400 units in stock. Identical electrical specifications to ES3D-E3/57T. Highest inventory availability among qualified substitutes. ROHS3 compliant with MSL 1 rating.
ES3D-13-F (Diodes Incorporated): Active product status with 45,182 units in stock. Forward voltage of 900 mV @ 3 A with reverse recovery time of 25 ns. ROHS3 compliant with MSL 1 rating.
ES3D (Diotec Semiconductor): Active product status with 131,200 units in stock. Highest inventory availability across all substitutes. Forward voltage of 900 mV @ 3 A with reverse recovery time of 20 ns (fastest recovery). ROHS3 compliant.
CSFC303-G (Comchip Technology): Active product status with 729 units in stock. Forward voltage of 950 mV @ 3 A with reverse recovery time of 35 ns. ROHS3 compliant with MSL 1 rating.
CURC303-G (Comchip Technology): Active product status with 4,164 units in stock. Forward voltage of 1000 mV @ 3 A with reverse recovery time of 50 ns. ROHS3 compliant with MSL 1 rating.
ER3D-TP (Micro Commercial Co): Active product status with 16,840 units in stock. Forward voltage of 950 mV @ 3 A with reverse recovery time of 35 ns. Operating temperature range extends to 175°C (maximum). ROHS3 compliant with MSL 1 rating.

Similar Substitutes (Enhanced Capability):

CFRC303-G (Comchip Technology): Active product status with 689 units in stock. Meets all primary criteria with forward voltage of 1300 mV @ 3 A. ROHS3 compliant with MSL 1 rating.
RS3D-M3/9AT (Vishay General Semiconductor - Diodes Division): Active product status with 811 units in stock. Forward voltage of 1300 mV @ 2.5 A with reverse recovery time of 150 ns. ROHS3 compliant with MSL 1 rating.

All identified substitutes maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory equivalence. Selection among qualified substitutes should prioritize active product status and inventory availability for procurement continuity.

Frequently Asked Questions (FAQ)

Q: Can the SS320 R7G be directly replaced with any of the listed substitute parts?

A: Yes. All listed substitute parts meet the primary electrical and mechanical criteria: 200 V reverse voltage rating, 3 A minimum current capacity, fast recovery speed classification (≤ 500ns), DO-214AB surface mount package, and ROHS3 compliance. Direct pin-to-pin replacement is mechanically and electrically feasible.

Q: What is the significance of forward voltage (Vf) differences among the substitutes?

A: Forward voltage represents the voltage drop across the diode during forward conduction. The SS320 R7G specifies 850 mV @ 3 A. Substitute parts range from 900 mV to 1300 mV @ 3 A. Lower forward voltage reduces power dissipation and heat generation. Parts with 900 mV forward voltage (ES3D, ES3D-13-F, ES3D-E3/57T, ES3D-E3/9AT) provide improved efficiency compared to the original specification.

Q: What does reverse recovery time (trr) indicate?

A: Reverse recovery time is the interval required for a forward-conducting diode to cease conduction when reverse bias is applied. Faster recovery times (20–35 ns) reduce switching losses and electromagnetic interference. The SS320 R7G does not specify reverse recovery time. Substitutes with trr values of 20–35 ns (ES3D, ES3D-13-F, ES3D-E3/57T, ES3D-E3/9AT, CSFC303-G, ER3D-TP) provide superior high-frequency performance.

Q: Are all substitutes available in the same packaging format?

A: Yes. All substitute parts are packaged in DO-214AB (SMC) surface mount configuration, identical to the SS320 R7G. This ensures mechanical compatibility with existing PCB layouts and automated assembly processes.

Q: Why do some substitutes have higher reverse leakage current specifications?

A: Reverse leakage current (Ir) represents the small current flowing through a reverse-biased diode. The SS320 R7G specifies 100 µA @ 200 V. Most substitutes specify 5–10 µA @ 200 V, indicating superior reverse blocking characteristics. Lower reverse leakage reduces standby power consumption and improves circuit efficiency.

Q: Which substitute offers the best overall performance?

A: Selection depends on application requirements. ES3D (Diotec Semiconductor) provides the fastest reverse recovery time (20 ns) and highest inventory availability (131,200 units). ES3D-E3/9AT (Vishay) offers equivalent performance with 110,400 units in stock. Both feature 900 mV forward voltage and ROHS3 compliance. ER3D-TP (Micro Commercial Co) extends the maximum junction temperature to 175°C, suitable for high-temperature applications.

Q: What is the difference between cut tape and tape & reel packaging?

A: Cut Tape (CT) & Digi-Reel® packaging provides components on continuous carrier tape suitable for manual handling and small-volume assembly. Tape & Reel (TR) packaging supplies components on full reels optimized for automated pick-and-place equipment and high-volume production. Both formats contain identical components; packaging selection depends on assembly methodology and order volume.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All identified substitute parts carry ROHS3 compliance certification, ensuring conformance to Restriction of Hazardous Substances Directive requirements. This maintains regulatory equivalence with the original SS320 R7G specification.

Q: What is Moisture Sensitivity Level (MSL) 1?

A: MSL 1 indicates unlimited shelf life without moisture-related degradation. Components rated MSL 1 require no special moisture-control storage or handling procedures, simplifying inventory management and reducing procurement complexity.

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