SS32 M6G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS32 M6G is a 20V, 3A Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation in DO-214AB (SMC) surface mount package. This component is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement. Schottky diodes in this voltage and current class are widely used in power supply circuits, reverse polarity protection, and high-frequency rectification applications where fast recovery characteristics are required.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 20 V
Operating Temperature - Junction	-55 to 125	°C
Package / Case	DO-214AB, SMC
Technology	Schottky
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SS32 M6G is determined by matching critical electrical parameters: reverse voltage rating (20V), average rectified current (3A), forward voltage drop characteristics, and fast recovery speed specification. The primary substitution criterion is electrical equivalence within the 20V/3A Schottky diode class.

Substitute parts are grouped into two categories:

Direct Electrical Equivalents (Same Package - DO-214AB SMC): Parts maintaining identical voltage and current ratings in the same surface mount package footprint, enabling direct PCB replacement without layout modification.

Electrical Equivalents (Alternative Packages): Parts with matching 20V/3A electrical specifications but different surface mount packages (SMA, SMB), requiring PCB layout adjustment but providing functional equivalence.

Higher Current Rated Parts: 5A-rated devices that exceed the 3A requirement, suitable for applications requiring design margin or future current capacity expansion.

Higher Voltage Rated Parts: 70V-rated devices that exceed the 20V requirement, applicable only in circuits where voltage derating is acceptable.

The following parameters determine substitution validity: Voltage - DC Reverse (Vr) (Max), Current - Average Rectified (Io), Voltage - Forward (Vf) (Max) @ If, Speed, Current - Reverse Leakage @ Vr, Operating Temperature - Junction, and Package / Case compatibility.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Speed	Ir @ Vr	Tj (Operating)	Package	Product Status	RoHS
SS32 M6G	Taiwan Semiconductor Corporation	20 V	3 A	500 mV @ 3 A	≤ 500ns	500 µA @ 20 V	-55 to 125°C	DO-214AB (SMC)	Discontinued	ROHS3
CDBC320-HF	Comchip Technology	20 V	3 A	450 mV @ 3 A	≤ 500ns	500 µA @ 20 V	-50 to 150°C	DO-214AB (SMC)	Active	ROHS3
B320Q-13-F	Diodes Incorporated	20 V	3 A	500 mV @ 3 A	≤ 500ns	500 µA @ 20 V	-55 to 150°C	DO-214AB (SMC)	Active	ROHS3
B320A-13-F	Diodes Incorporated	20 V	3 A	500 mV @ 3 A	≤ 500ns	500 µA @ 20 V	-55 to 150°C	DO-214AC (SMA)	Active	ROHS3
SS32	MDD	20 V	3 A	Not specified	≤ 500ns	500 µA @ 20 V	-55 to 125°C	DO-214AC (SMA)	Active	ROHS3
5820SMJE3/TR13	Microchip Technology	20 V	3 A	460 mV @ 3 A	≤ 500ns	1.5 mA @ 20 V	-55 to 150°C	DO-214AB	Active	ROHS3
5820SMJ/TR13	Microchip Technology	20 V	3 A	460 mV @ 3 A	≤ 500ns	1.5 mA @ 20 V	-55 to 150°C	DO-214AB	Active	RoHS non-compliant
B320B-13-F	Diodes Incorporated	20 V	3 A	500 mV @ 3 A	≤ 500ns	500 µA @ 20 V	-55 to 150°C	DO-214AA (SMB)	Active	ROHS3
B520CQ-13-F	Diodes Incorporated	20 V	5 A	550 mV @ 5 A	≤ 500ns	500 µA @ 20 V	-55 to 150°C	DO-214AB (SMC)	Active	ROHS3
B520C-13-F	Diodes Incorporated	20 V	5 A	550 mV @ 5 A	≤ 500ns	500 µA @ 20 V	-55 to 150°C	DO-214AB (SMC)	Active	ROHS3
B370Q-13-F	Diodes Incorporated	70 V	3 A	790 mV @ 3 A	≤ 500ns	500 µA @ 70 V	-55 to 125°C	DO-214AB (SMC)	Active	ROHS3

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Same Package, Identical Electrical Specifications):

CDBC320-HF (Comchip Technology) and B320Q-13-F (Diodes Incorporated) are direct functional replacements for the SS32 M6G in DO-214AB SMC package. Both maintain 20V/3A ratings with matching fast recovery characteristics and RoHS3 compliance. CDBC320-HF offers improved forward voltage (450 mV vs. 500 mV) and extended operating temperature range (-50 to 150°C). B320Q-13-F provides automotive-grade qualification (AEC-Q101) with extended temperature range (-55 to 150°C). Both are active products with established supply availability.

Tier 2 - Electrical Equivalents (Alternative Packages):

B320A-13-F (Diodes Incorporated, SMA package) and SS32 (MDD, SMA package) provide identical 20V/3A electrical specifications with automotive qualification (B320A-13-F) but require PCB layout modification due to different surface mount footprint. These are suitable for new designs or redesigns where package change is acceptable.

B320B-13-F (Diodes Incorporated, SMB package) offers 20V/3A performance in a larger SMB footprint with automotive qualification and extended temperature range.

Tier 3 - Higher Current Capacity:

B520CQ-13-F and B520C-13-F (Diodes Incorporated, 5A rated) maintain 20V reverse voltage in DO-214AB SMC package with 5A current capacity. These are suitable for applications requiring design margin or future current expansion. Both include automotive qualification and extended operating temperature range.

Tier 4 - Higher Voltage Rated:

B370Q-13-F (Diodes Incorporated, 70V rated) maintains 3A current in DO-214AB SMC package with higher voltage rating. This part is applicable only in circuits where voltage derating is acceptable and is not recommended as a direct substitute due to significantly higher forward voltage drop (790 mV vs. 500 mV).

Compliance Considerations:

All recommended Tier 1 and Tier 2 substitutes maintain ROHS3 compliance. The 5820SMJ/TR13 (Microchip Technology) is RoHS non-compliant and should not be selected for applications requiring RoHS certification. The 5820SMJE3/TR13 variant provides RoHS3 compliance with identical electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can B320Q-13-F directly replace SS32 M6G without PCB modification?

A: Yes. B320Q-13-F is packaged in DO-214AB SMC, identical to the SS32 M6G footprint. Both maintain 20V/3A electrical specifications with matching fast recovery characteristics. No PCB layout changes are required.

Q: What is the difference between CDBC320-HF and B320Q-13-F?

A: Both are 20V/3A Schottky diodes in DO-214AB SMC package with fast recovery characteristics. CDBC320-HF (Comchip Technology) offers lower forward voltage (450 mV vs. 500 mV) and extended minimum operating temperature (-50°C vs. -55°C). B320Q-13-F (Diodes Incorporated) includes automotive-grade qualification (AEC-Q101). Selection depends on whether forward voltage optimization or automotive certification is prioritized.

Q: Can I use B320A-13-F as a substitute if my PCB supports SMA package?

A: Yes. B320A-13-F provides identical 20V/3A electrical specifications with automotive qualification. The SMA package footprint differs from the original DO-214AB SMC, but electrical performance is equivalent. Verify PCB layout compatibility before implementation.

Q: Are B520CQ-13-F and B520C-13-F interchangeable?

A: Yes. Both are 20V/5A Schottky diodes in DO-214AB SMC package with identical electrical specifications. B520CQ-13-F includes automotive-grade qualification (AEC-Q101). Selection depends on whether automotive certification is required.

Q: Why is B370Q-13-F listed as a substitute if it has 70V rating?

A: B370Q-13-F is listed as a similar part due to matching 3A current and DO-214AB SMC package. However, the 70V rating and significantly higher forward voltage (790 mV) make it unsuitable as a direct replacement. Use only in applications where voltage derating is acceptable and higher forward voltage drop does not impact circuit performance.

Q: What is the significance of the temperature range difference between SS32 M6G (-55 to 125°C) and substitute parts (-55 to 150°C)?

A: The extended upper temperature limit in substitute parts (150°C vs. 125°C) provides additional thermal margin. This does not affect substitution validity; the substitute parts operate safely within the original part's temperature range. Extended range is beneficial for applications with elevated ambient or junction temperatures.

Q: Is RoHS compliance important for selecting a substitute?

A: Yes. For applications requiring RoHS certification, select only ROHS3-compliant parts. The 5820SMJ/TR13 is RoHS non-compliant and should not be used in regulated applications. The 5820SMJE3/TR13 variant provides RoHS3 compliance with identical electrical specifications.

Q: What does "Fast Recovery ≤ 500ns, > 200mA (Io)" mean?

A: This specification indicates the diode's reverse recovery time is 500 nanoseconds or less when switching from forward to reverse bias at currents exceeding 200 milliamps. All listed substitutes meet this specification, ensuring compatibility in high-frequency rectification and switching applications.

Q: Can I use multiple lower-current diodes in parallel instead of a single higher-current substitute?

A: Parallel connection of Schottky diodes is not recommended due to unequal current sharing caused by forward voltage variations between devices. Use single diodes rated for the required current instead.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape packaging provides individual component strips suitable for small-quantity procurement and manual assembly. Tape & Reel packaging provides continuous reels for automated assembly equipment. Electrical specifications are identical; packaging selection depends on assembly process requirements and order quantity.

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