SS22HM4G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS22HM4G is a 20V, 2A Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation in the DO-214AA (SMB) surface mount package. This component is classified as a fast recovery Schottky diode with a maximum forward voltage of 500 mV at 2A and reverse leakage current of 400 µA at 20V. The part is AEC-Q101 qualified for automotive applications and RoHS3 compliant.

The SS22HM4G is currently discontinued at DiGi Electronics. Equivalent and substitute parts are available from multiple manufacturers with identical or comparable electrical characteristics, allowing for direct replacement in new designs or production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	20	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) Maximum @ If	500 mV @ 2 A	mV @ A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	400	µA @ 20 V
Technology	Schottky	—
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 125	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SS22HM4G is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) Maximum: 20V (exact match required)
Current - Average Rectified (Io): 2A (exact match required for full current rating)
Technology: Schottky (fast recovery diode classification)
Package / Case: DO-214AA, SMB (surface mount mechanical compatibility)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Factors:

Forward voltage (Vf) at rated current: 500 mV @ 2A or lower is acceptable
Reverse leakage current: 400 µA @ 20V or lower is acceptable
Operating temperature range: -55°C to 125°C minimum
RoHS3 compliance and AEC-Q101 qualification preferred for automotive applications

Parts are grouped into three categories:

Direct Equivalents (Parametric Match): Parts with identical 20V/2A ratings and DO-214AA packaging from the same or different manufacturers.

Functional Equivalents (Automotive Grade): Parts with 20V/2A ratings, AEC-Q101 qualification, and extended temperature ranges suitable for automotive use.

Similar Parts (Current Derating): Parts with 20V reverse voltage but 1A current rating, suitable only for applications requiring ≤1A average rectified current.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ If	Reverse Leakage @ Vr	Package	Product Status	AEC-Q101	RoHS3
SS22HM4G	Taiwan Semiconductor Corporation	20	2	500 mV @ 2 A	400 µA @ 20 V	DO-214AA, SMB	Discontinued	Yes	Yes
SS22 R5G	Taiwan Semiconductor Corporation	20	2	500 mV @ 2 A	400 µA @ 20 V	DO-214AA, SMB	Discontinued	No	Yes
SL22HE3_A/H	Vishay General Semiconductor - Diodes Division	20	2	395 mV @ 1 A	400 µA @ 20 V	DO-214AA, SMB	Active	Yes	Yes
SL22HE3_A/I	Vishay General Semiconductor - Diodes Division	20	2	395 mV @ 1 A	400 µA @ 20 V	DO-214AA, SMB	Active	Yes	Yes
B220Q-13-F	Diodes Incorporated	20	2	500 mV @ 2 A	500 µA @ 20 V	DO-214AA, SMB	Active	Yes	Yes
B220-13-F	Diodes Incorporated	20	2	500 mV @ 2 A	500 µA @ 20 V	DO-214AA, SMB	Active	No	Yes
5817SMJ/TR13	Microchip Technology	20	1	450 mV @ 1 A	1 mA @ 20 V	DO-214AA, SMB	Active	No	No
CMSH1-20 BK PBFREE	Central Semiconductor Corp	20	1	550 mV @ 1 A	500 µA @ 20 V	DO-214AA, SMB	Active	No	Yes
SK12-LTP	Micro Commercial Co	20	1	500 mV @ 1 A	500 µA @ 20 V	DO-214AA, SMB	Not For New Designs	No	Yes
SK12E3/TR13	Microsemi Corporation	20	1	450 mV @ 1 A	500 µA @ 20 V	DO-214AA, SMB	Active	No	Yes

Engineering Selection Recommendations

For Direct Replacement (20V/2A Full Rating):

The SL22HE3_A/H and SL22HE3_A/I from Vishay General Semiconductor are the primary recommended substitutes. Both parts are active products with AEC-Q101 automotive qualification, RoHS3 compliance, and identical 20V/2A electrical ratings. The forward voltage is lower (395 mV @ 1A versus 500 mV @ 2A), providing improved efficiency. Both are supplied in Tape & Reel packaging with 930 and 1106 units in stock respectively.

The B220Q-13-F from Diodes Incorporated is an alternative direct replacement with identical 20V/2A ratings, AEC-Q101 qualification, and RoHS3 compliance. This part is actively produced with 3868 units in stock and is supplied in Tape & Reel packaging.

The SS22 R5G from Taiwan Semiconductor Corporation provides parametric equivalence with identical electrical specifications to the original SS22HM4G, including 500 mV forward voltage at 2A and 400 µA reverse leakage. However, this part is also discontinued and lacks AEC-Q101 qualification.

For Current-Limited Applications (≤1A):

When the application circuit limits average rectified current to 1A or less, the following parts are suitable: 5817SMJ/TR13 (Microchip Technology), CMSH1-20 BK PBFREE (Central Semiconductor Corp), SK12E3/TR13 (Microsemi Corporation), and SK12-LTP (Micro Commercial Co). These parts maintain the 20V reverse voltage rating with reduced current capacity. The SK12-LTP is marked "Not For New Designs" and should be avoided for new product development.

Compliance and Qualification Considerations:

For automotive applications requiring AEC-Q101 qualification, select from: SL22HE3_A/H, SL22HE3_A/I, B220Q-13-F, or SS22 R5G. All other listed parts lack automotive qualification.

For RoHS3 compliance, all listed parts except 5817SMJ/TR13 meet this requirement.

For active product status (ongoing production and support), the Vishay SL22HE3 series and Diodes Incorporated B220Q-13-F are preferred over discontinued parts.

Frequently Asked Questions (FAQ)

Q: Can I use a 1A rated diode (such as CMSH1-20 BK PBFREE or SK12E3/TR13) as a direct replacement for the SS22HM4G?

A: No, not for applications requiring the full 2A average rectified current. The 1A rated parts are suitable only when circuit design limits average rectified current to 1A or less. Using a 1A part in a 2A application will cause thermal stress and premature failure. Verify the actual current requirements in your circuit before selecting a 1A substitute.

Q: What is the difference between the SL22HE3_A/H and SL22HE3_A/I?

A: Both parts are electrically identical with 20V/2A ratings, AEC-Q101 qualification, and RoHS3 compliance. The difference is in the manufacturing date code designation (H versus I). Both are active products from Vishay with equivalent performance and availability. Either part is suitable for replacement.

Q: Why does the B220-13-F show higher reverse leakage (500 µA) compared to the SS22HM4G (400 µA)?

A: The B220-13-F has a specified reverse leakage of 500 µA at 20V, which is within acceptable tolerance for Schottky diodes and does not affect functional compatibility. This 100 µA difference is negligible in most circuit applications. The B220-13-F remains a valid substitute for the SS22HM4G.

Q: Is the SS22 R5G a suitable replacement even though it is discontinued?

A: The SS22 R5G provides parametric equivalence with identical electrical specifications (20V/2A, 500 mV forward voltage, 400 µA reverse leakage). However, it is discontinued at DiGi Electronics and lacks AEC-Q101 automotive qualification. For new designs or production continuity, the active Vishay SL22HE3 series or Diodes Incorporated B220Q-13-F are preferred.

Q: Can I use the B220A-13-F (SMA package) instead of the DO-214AA (SMB) package?

A: No. The B220A-13-F uses the DO-214AC (SMA) package, which has different mechanical dimensions and PCB footprint compared to the DO-214AA (SMB) package of the SS22HM4G. Package compatibility is required for direct board-level replacement. The B220-13-F or B220Q-13-F (both in SMB package) are the correct Diodes Incorporated alternatives.

Q: What is the operating temperature range difference between the SS22HM4G and the Vishay SL22HE3 series?

A: The SS22HM4G operates from -55°C to 125°C junction temperature. The Vishay SL22HE3_A/H and SL22HE3_A/I also operate from -55°C to 125°C. There is no temperature range difference between these parts, making them fully compatible for automotive applications.

Q: Why do some substitute parts show forward voltage at 1A instead of 2A?

A: Forward voltage characteristics vary with current level. The Vishay SL22HE3 series specifies forward voltage at 1A (395 mV) rather than 2A. This is a manufacturer datasheet convention and does not indicate reduced current capacity. The SL22HE3 parts are rated for 2A average rectified current and are suitable for full 2A applications.

Q: Is RoHS3 compliance mandatory for my application?

A: RoHS3 compliance is required for products sold in the European Union and many other regions. If your application is subject to RoHS regulations, avoid the 5817SMJ/TR13 (Microchip Technology), which is RoHS non-compliant. All other listed substitutes are RoHS3 compliant.

Q: What does "Not For New Designs" mean for the SK12-LTP?

A: "Not For New Designs" indicates that the manufacturer (Micro Commercial Co) is not recommending this part for new product development. While existing inventory may be available, the part is in end-of-life status. For new designs, select from active products such as the Vishay SL22HE3 series or Diodes Incorporated B220Q-13-F.

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