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SS32 R7G Schottky Diode Equivalent & Substitute Parts
Part Overview
The SS32 R7G is a 20V, 3A Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation in DO-214AB (SMC) surface mount package. This component is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production continuity. The part operates across a junction temperature range of -55°C to 125°C and exhibits fast recovery characteristics suitable for high-frequency switching applications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - DC Reverse (Vr) Maximum | 20 | V |
| Current - Average Rectified (Io) | 3 | A |
| Voltage - Forward (Vf) Maximum @ If | 500 mV @ 3 A | mV @ A |
| Speed Classification | Fast Recovery ≤ 500ns, > 200mA (Io) | — |
| Current - Reverse Leakage @ Vr | 500 | µA @ 20 V |
| Technology | Schottky | — |
| Package / Case | DO-214AB, SMC | — |
| Operating Temperature - Junction | -55 to 125 | °C |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the SS32 R7G is determined by strict equivalence across the following critical electrical and mechanical parameters:
Primary Substitution Criteria:
- Voltage - DC Reverse (Vr) Maximum: 20V
- Current - Average Rectified (Io): 3A
- Technology: Schottky
- Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
- Current - Reverse Leakage @ Vr: 500 µA @ 20 V
- Package / Case: DO-214AB, SMC (for direct mechanical compatibility)
Substitution Categories:
Direct Equivalents (Same Package - DO-214AB SMC): Parts meeting all primary criteria in identical DO-214AB SMC packaging enable direct board-level substitution without layout modification.
Functional Equivalents (Alternative Packages): Parts meeting all primary electrical criteria but in different surface mount packages (SMA, SMB) require PCB layout adjustment but maintain electrical performance.
Similar Parts (Elevated Current Rating): Parts with 20V reverse voltage and 3A current rating but in alternative packages are functionally suitable for applications not constrained by package footprint.
Non-Equivalent Parts (Excluded from Substitution): Parts with voltage ratings exceeding 20V (such as 70V variants) or current ratings differing from 3A do not meet substitution criteria and are listed for reference only.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Vr (Max) [V] | Io [A] | Vf (Max) @ If [mV @ A] | Reverse Leakage @ Vr [µA] | Package / Case | Tj Range [°C] | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| SS32 R7G | Taiwan Semiconductor Corporation | 20 | 3 | 500 @ 3 | 500 @ 20V | DO-214AB, SMC | -55 to 125 | Discontinued | ROHS3 Compliant |
| B320A-13-F | Diodes Incorporated | 20 | 3 | 500 @ 3 | 500 @ 20V | DO-214AC, SMA | -55 to 150 | Active | ROHS3 Compliant |
| CDBC320-HF | Comchip Technology | 20 | 3 | 450 @ 3 | 500 @ 20V | DO-214AB, SMC | -50 to 150 | Active | ROHS3 Compliant |
| SS32 | MDD | 20 | 3 | — | 500 @ 20V | DO-214AC, SMA | -55 to 125 | Active | ROHS3 Compliant |
| 5820SMJ/TR13 | Microchip Technology | 20 | 3 | 460 @ 3 | 1.5 mA @ 20V | DO-214AB | -55 to 150 | Active | RoHS non-compliant |
| 5820SMJE3/TR13 | Microchip Technology | 20 | 3 | 460 @ 3 | 1.5 mA @ 20V | DO-214AB | -55 to 150 | Active | ROHS3 Compliant |
| B320B-13-F | Diodes Incorporated | 20 | 3 | 500 @ 3 | 500 @ 20V | DO-214AA, SMB | -55 to 150 | Active | ROHS3 Compliant |
| B320Q-13-F | Diodes Incorporated | 20 | 3 | 500 @ 3 | 500 @ 20V | DO-214AB, SMC | -55 to 150 | Active | ROHS3 Compliant |
| B370Q-13-F | Diodes Incorporated | 70 | 3 | 790 @ 3 | 500 @ 70V | DO-214AB, SMC | -55 to 125 | Active | ROHS3 Compliant |
| B520C-13-F | Diodes Incorporated | 20 | 5 | 550 @ 5 | 500 @ 20V | DO-214AB, SMC | -55 to 150 | Active | ROHS3 Compliant |
| B520CQ-13-F | Diodes Incorporated | 20 | 5 | 550 @ 5 | 500 @ 20V | DO-214AB, SMC | -55 to 150 | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Tier 1 - Direct Substitutes (Identical Electrical and Package Specifications):
CDBC320-HF (Comchip Technology) is the primary direct substitute. This part maintains the DO-214AB SMC package, 20V reverse voltage, and 3A current rating. The forward voltage specification of 450 mV @ 3A is superior to the original 500 mV specification, providing improved efficiency. The part is ROHS3 compliant and carries active product status with 1313 units in stock. Operating temperature range extends to 150°C, exceeding the original specification.
B320Q-13-F (Diodes Incorporated) is an alternative direct substitute in DO-214AB SMC package with identical electrical specifications (500 mV @ 3A forward voltage). This part carries AEC-Q101 automotive qualification and ROHS3 compliance. Extended operating temperature to 150°C and higher inventory availability (9400 units) support production continuity.
Tier 2 - Functional Equivalents (Identical Electrical Specifications, Alternative Packages):
B320A-13-F (Diodes Incorporated) meets all electrical criteria in DO-214AC SMA package. This part requires PCB layout modification but maintains electrical performance. AEC-Q101 qualification and extended temperature range (-55°C to 150°C) are provided. High inventory (35100 units) ensures supply availability.
SS32 (MDD) in DO-214AC SMA package provides functional equivalence with 20V/3A specifications. Active product status and 19566 units in stock support design flexibility. Package change requires layout adjustment.
Tier 3 - Conditional Substitutes (Elevated Reverse Leakage Current):
5820SMJE3/TR13 (Microchip Technology) meets voltage and current specifications in DO-214AB package with ROHS3 compliance and active status. Reverse leakage current of 1.5 mA @ 20V exceeds the original 500 µA specification. This elevated leakage may impact power dissipation in low-current applications. Extended temperature range to 150°C is provided.
5820SMJ/TR13 (Microchip Technology) offers similar electrical performance but carries RoHS non-compliance status, limiting use in regulated applications.
Tier 4 - Non-Equivalent Parts (Reference Only):
B370Q-13-F (70V rating) and B520C-13-F / B520CQ-13-F (5A current rating) do not meet substitution criteria due to parameter deviations and are excluded from direct replacement consideration.
Frequently Asked Questions (FAQ)
Q: Can CDBC320-HF directly replace SS32 R7G without PCB modification?
A: Yes. CDBC320-HF maintains identical DO-214AB SMC package dimensions and pinout. No PCB layout modification is required. The superior forward voltage specification (450 mV vs. 500 mV @ 3A) provides improved performance.
Q: What is the primary difference between B320Q-13-F and CDBC320-HF?
A: Both are direct package equivalents in DO-214AB SMC. B320Q-13-F specifies 500 mV forward voltage matching the original part, while CDBC320-HF specifies 450 mV. CDBC320-HF carries lower reverse leakage current specification. B320Q-13-F includes AEC-Q101 automotive qualification.
Q: Why do B320A-13-F and SS32 (MDD) require PCB modification?
A: These parts use DO-214AC SMA package instead of DO-214AB SMC. Physical footprint and pin spacing differ, requiring PCB layout adjustment. Electrical performance remains equivalent.
Q: Is 5820SMJE3/TR13 suitable for all applications requiring SS32 R7G?
A: 5820SMJE3/TR13 meets voltage and current specifications but exhibits elevated reverse leakage current (1.5 mA @ 20V vs. 500 µA). Applications sensitive to leakage-induced power dissipation require thermal analysis. ROHS3 compliance is provided.
Q: What is the impact of extended operating temperature range in substitute parts?
A: Substitute parts extending to 150°C junction temperature provide enhanced thermal margin. Original SS32 R7G specification of -55°C to 125°C is maintained or exceeded by all active substitutes, supporting broader environmental operating conditions.
Q: Can B520CQ-13-F replace SS32 R7G in current-limited applications?
A: B520CQ-13-F is rated for 5A average rectified current, exceeding the 3A requirement. While electrically compatible at 3A operation, this part is oversized for the application and does not constitute a direct substitute. Use is not recommended unless specific design requirements justify the elevated current rating.
Q: Are all recommended substitutes RoHS3 compliant?
A: All Tier 1 and Tier 2 substitutes carry ROHS3 compliance. 5820SMJ/TR13 is RoHS non-compliant and excluded from regulated applications. 5820SMJE3/TR13 provides ROHS3 compliance as an alternative Microchip option.
Q: What inventory considerations apply to substitute selection?
A: B320A-13-F (35100 units), B320Q-13-F (9400 units), and SS32 MDD (19566 units) provide substantial inventory. CDBC320-HF (1313 units) and 5820SMJE3/TR13 (1137 units) offer lower stock levels. Production planning should account for lead times and allocation policies.
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