SS35 Equivalent & Substitute Parts

Part Overview

The SS35 is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 50 V DC reverse voltage and 3 A average rectified current in a DO-214AB (SMC) surface mount package. This component is classified as Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are necessary when the primary SS35 component becomes unavailable, when alternative packaging formats are required for specific PCB layouts, or when design modifications necessitate different electrical characteristics within compatible parameter ranges. Substitute diodes must maintain compatibility with the 50 V reverse voltage rating and 3 A current specification while accommodating variations in forward voltage drop, recovery speed, and reverse leakage current based on application requirements.

Key Parameters

Parameter	SS35 Value	Unit	Substitution Relevance
Voltage - DC Reverse (Vr) (Max)	50	V	Critical - Must match or exceed
Current - Average Rectified (Io)	3	A	Critical - Must match or exceed
Voltage - Forward (Vf) (Max) @ If	750 mV @ 3 A	mV	Important - Affects power dissipation
Technology	Schottky	-	Defines recovery characteristics
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns	Important - Affects switching performance
Current - Reverse Leakage @ Vr	500 µA @ 50 V	µA	Important - Affects standby current
Package / Case	DO-214AB, SMC	-	Critical - PCB footprint compatibility
Operating Temperature - Junction	-55°C ~ 150°C	°C	Important - Thermal operating range
RoHS Status	ROHS3 Compliant	-	Regulatory requirement

Substitute Part Grouping Explanation

Substitute parts for the SS35 are grouped based on strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 50 V minimum
Current - Average Rectified (Io): 3 A minimum
Package / Case: DO-214AB (SMC) for direct footprint compatibility, or DO-214AA (SMB) for alternative surface mount packages
Mounting Type: Surface Mount

Compatible Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Acceptable range 750 mV to 1.3 V @ 3 A (higher values acceptable for non-critical applications)
Speed: Fast Recovery (≤ 500ns) or Standard Recovery (> 500ns) depending on application switching requirements
Current - Reverse Leakage @ Vr: 5 µA to 500 µA @ 50 V (lower values preferred for low-standby-current applications)
Operating Temperature - Junction: -55°C to -65°C minimum, 150°C maximum
RoHS Status: ROHS3 Compliant required

Package Format Variations:

DO-214AB (SMC): Direct replacement footprint
DO-214AA (SMB): Larger surface mount package, requires PCB layout modification
Tape & Reel (TR) or Cut Tape (CT) packaging: Affects component procurement and handling, not electrical compatibility

Substitutes are organized into two primary categories: DO-214AB (SMC) Direct Replacements and Alternative Package Formats.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ If (mV)	Technology	Speed	Ir @ Vr (µA)	Package	Temp Range (°C)	Status
SS35	Taiwan Semiconductor Corporation	50	3	750 @ 3A	Schottky	Fast ≤ 500ns	500 @ 50V	DO-214AB (SMC)	-55 to 150	Active
ES3A	Taiwan Semiconductor Corporation	50	3	950 @ 3A	Standard	Fast ≤ 500ns	10 @ 50V	DO-214AB (SMC)	-55 to 150	Active
ES3A-13-F	Diodes Incorporated	50	3	900 @ 3A	Standard	Fast ≤ 500ns	10 @ 50V	DO-214AB (SMC)	-55 to 150	Active
ES3A-E3/57T	Vishay General Semiconductor - Diodes Division	50	3	900 @ 3A	Standard	Fast ≤ 500ns	10 @ 50V	DO-214AB (SMC)	-55 to 150	Active
ES3A-E3/9AT	Vishay General Semiconductor - Diodes Division	50	3	900 @ 3A	Standard	Fast ≤ 500ns	10 @ 50V	DO-214AB (SMC)	-55 to 150	Active
ES3AB-13-F	Diodes Incorporated	50	3	900 @ 3A	Standard	Fast ≤ 500ns	10 @ 50V	DO-214AA (SMB)	-55 to 150	Active
RS3A-13-F	Diodes Incorporated	50	3	1300 @ 3A	Standard	Fast ≤ 500ns	5 @ 50V	DO-214AB (SMC)	-65 to 150	Active
RS3AB-13-F	Diodes Incorporated	50	3	1300 @ 3A	Standard	Fast ≤ 500ns	5 @ 50V	DO-214AA (SMB)	-65 to 150	Active
S3A	Diodes Incorporated	50	3	1150 @ 3A	Standard	Standard > 500ns	10 @ 50V	DO-214AB (SMC)	-65 to 150	Obsolete
CGRC501-G	Comchip Technology	50	5	1150 @ 5A	Standard	Standard > 500ns	10 @ 50V	DO-214AB (SMC)	-55 to 150	Active
S10A-TP	Micro Commercial Co	50	10	1200 @ 10A	Standard	Standard > 500ns	10 @ 50V	DO-214AB (HSMC)	-55 to 150	Obsolete

Engineering Selection Recommendations

For Direct DO-214AB (SMC) Package Replacement with Active Status:

ES3A-13-F (Diodes Incorporated) and ES3A-E3/57T or ES3A-E3/9AT (Vishay General Semiconductor - Diodes Division) are the primary recommended substitutes. These parts maintain the 50 V / 3 A electrical specification, operate across the -55°C to 150°C temperature range, and are classified as Active product status. Forward voltage drop is 900 mV @ 3 A, representing a 150 mV increase from the SS35 Schottky specification. These parts are RoHS3 compliant and REACH unaffected.

ES3A (Taiwan Semiconductor Corporation) is an alternative from the same manufacturer as the SS35, offering 950 mV forward voltage drop and Active status, with identical temperature range and compliance certifications.

For Alternative SMB Package (DO-214AA) Format:

ES3AB-13-F (Diodes Incorporated) provides equivalent electrical performance in the larger DO-214AA (SMB) surface mount package. This substitution requires PCB layout modification but maintains the 50 V / 3 A rating, -55°C to 150°C operating range, and Active product status.

For Extended Temperature Range Applications:

RS3A-13-F and RS3AB-13-F (Diodes Incorporated) extend the minimum operating temperature to -65°C, accommodating applications requiring enhanced low-temperature performance. These parts maintain 50 V / 3 A ratings and Active status. Forward voltage drop increases to 1300 mV @ 3 A, with reduced reverse leakage current of 5 µA @ 50 V.

For Higher Current Capacity:

CGRC501-G (Comchip Technology) provides 50 V / 5 A rating in DO-214AB (SMC) package, suitable for applications requiring current margin above the 3 A specification. This part is Active status and RoHS3 compliant.

Obsolete Parts (Not Recommended for New Designs):

S3A (Diodes Incorporated) and S10A-TP (Micro Commercial Co) are classified as Obsolete. These parts are not recommended for new design implementations due to product lifecycle status, though limited inventory remains available.

Frequently Asked Questions (FAQ)

Q: Can the SS35 be directly replaced with ES3A-13-F without PCB modification?

A: Yes. Both parts use the DO-214AB (SMC) package with identical footprints. No PCB layout changes are required. The primary electrical difference is forward voltage drop: SS35 is 750 mV @ 3 A (Schottky technology) versus ES3A-13-F at 900 mV @ 3 A (Standard technology). This 150 mV increase results in approximately 450 mW additional power dissipation at 3 A continuous current.

Q: What is the difference between DO-214AB (SMC) and DO-214AA (SMB) packages?

A: DO-214AB (SMC) and DO-214AA (SMB) are different surface mount package formats with different PCB footprints. SMC is smaller than SMB. Parts like ES3AB-13-F use the larger SMB package and require PCB redesign if substituting for SMC-packaged components. Electrical specifications remain identical; only physical dimensions and land pattern differ.

Q: Why does the SS35 have higher reverse leakage current (500 µA) compared to substitute parts (10 µA)?

A: The SS35 uses Schottky diode technology, which inherently exhibits higher reverse leakage current than standard rectifier diodes. This is a characteristic of Schottky junction design. Standard rectifier substitutes like ES3A-13-F have lower leakage due to different semiconductor junction construction. For applications sensitive to standby current, standard rectifier substitutes are preferable.

Q: Can S10A-TP be used as a substitute for SS35?

A: S10A-TP is classified as Obsolete product status and is not recommended for new designs. Although it maintains 50 V reverse voltage and provides 10 A current capacity (exceeding the 3 A requirement), its obsolete status indicates discontinued manufacturing and limited future availability. Active alternatives such as CGRC501-G should be used instead.

Q: What is the impact of using RS3A-13-F instead of SS35 in terms of power dissipation?

A: RS3A-13-F has forward voltage drop of 1300 mV @ 3 A compared to SS35 at 750 mV @ 3 A. At 3 A continuous current, this represents 1650 mW additional power dissipation (1.65 W). Thermal management design must account for this increased heat generation. RS3A-13-F is suitable only for applications where the extended -65°C minimum temperature range justifies the higher power loss.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain RoHS3 compliance and REACH unaffected status, matching the SS35 regulatory classification. This ensures compatibility with RoHS3-regulated supply chains and end-use applications.

Q: What is the difference between Fast Recovery (≤ 500ns) and Standard Recovery (> 500ns) speed classifications?

A: Fast Recovery diodes switch off more quickly, reducing reverse recovery time and associated switching losses in high-frequency applications. Standard Recovery diodes have longer switching times but typically lower forward voltage drop. SS35 is Fast Recovery Schottky. Most substitute parts are Fast Recovery Standard technology, providing similar switching performance with different forward voltage characteristics.

Q: Can CGRC501-G be used in place of SS35 if the application only requires 3 A?

A: Yes. CGRC501-G is rated for 50 V / 5 A, exceeding the 3 A requirement. At 3 A operating current, the part operates well within its current rating, providing design margin. The 50 V reverse voltage matches the SS35 specification. Forward voltage drop is 1150 mV @ 5 A; actual drop at 3 A will be lower. This substitution is electrically valid for applications not requiring the lower forward voltage of Schottky technology.

Q: What packaging options are available for the SS35 substitute parts?

A: Substitute parts are available in three packaging formats: DO-214AB (SMC) for direct footprint replacement, DO-214AA (SMB) for larger surface mount applications, and various tape formats (Tape & Reel or Cut Tape) for automated assembly. The electrical specifications remain identical across all packaging options; only the physical form factor and procurement method differ.

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