SS29HM4G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS29HM4G is a 90V, 2A Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation in DO-214AA (SMB) surface mount package. This component is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement. The part qualifies for automotive applications under AEC-Q101 certification and maintains ROHS3 compliance.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	90 V
Current - Average Rectified (Io)	2 A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 2 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	100 µA @ 90 V
Package / Case	DO-214AA, SMB
Operating Temperature - Junction	-55°C ~ 150°C
Technology	Schottky
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the SS29HM4G is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 90 V (exact match required)
Current - Average Rectified (Io): 2 A (exact match required)
Package / Case: DO-214AA, SMB (exact match required)
Technology: Schottky (exact match required)
Mounting Type: Surface Mount (exact match required)

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: Must not exceed application requirements
Current - Reverse Leakage @ Vr: Lower values indicate superior performance
Operating Temperature - Junction: Must encompass application temperature range
Compliance: ROHS3 and automotive qualification preferred for equivalent functionality

Substitute parts are grouped into two categories:

Category A - Full Electrical & Mechanical Equivalents (90V, 2A, DO-214AA): Parts meeting all primary matching criteria with identical voltage and current ratings in the same package.

Category B - Reduced Current Rating (90V, 1A, DO-214AA): Parts with lower current capacity that do not provide equivalent current handling and are suitable only for applications with reduced current requirements.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Reverse Leakage @ Vr	Package	Temp Range (Tj)	Status	AEC-Q101
SS29HM4G	Taiwan Semiconductor Corporation	90 V	2 A	850 mV @ 2 A	100 µA @ 90 V	DO-214AA (SMB)	-55°C ~ 150°C	Discontinued	Yes
SS29	Taiwan Semiconductor Corporation	90 V	2 A	850 mV @ 2 A	100 µA @ 90 V	DO-214AA (SMB)	-55°C ~ 150°C	Active	No
SS2H9-E3/5BT	Vishay General Semiconductor - Diodes Division	90 V	2 A	790 mV @ 2 A	10 µA @ 90 V	DO-214AA (SMB)	-65°C ~ 175°C	Active	No
SS2H9-E3/52T	Vishay General Semiconductor - Diodes Division	90 V	2 A	790 mV @ 2 A	10 µA @ 90 V	DO-214AA (SMB)	-65°C ~ 175°C	Active	No
B290-13-F	Diodes Incorporated	90 V	2 A	790 mV @ 2 A	7 µA @ 90 V	DO-214AA (SMB)	-65°C ~ 150°C	Active	No
B290Q-13-F	Diodes Incorporated	90 V	2 A	790 mV @ 2 A	7 µA @ 90 V	DO-214AA (SMB)	-65°C ~ 150°C	Active	Yes
B190BQ-13-F	Diodes Incorporated	90 V	1 A	790 mV @ 1 A	500 µA @ 90 V	DO-214AA (SMB)	-65°C ~ 150°C	Active	Yes

Engineering Selection Recommendations

Primary Substitute - Full Equivalence:

The SS29 (Taiwan Semiconductor Corporation) provides direct electrical and mechanical equivalence to the SS29HM4G. Both parts share identical voltage ratings (90V), current capacity (2A), forward voltage characteristics (850 mV @ 2A), and package configuration (DO-214AA SMB). The SS29 maintains active product status and ROHS3 compliance. This part is the preferred substitute when procurement of the original discontinued part is not feasible.

Secondary Substitutes - Enhanced Performance:

The SS2H9-E3/5BT and SS2H9-E3/52T (Vishay General Semiconductor - Diodes Division) are functionally equivalent in voltage, current, and package specifications. Both offer improved reverse leakage characteristics (10 µA versus 100 µA) and extended operating temperature range (-65°C ~ 175°C versus -55°C ~ 150°C). These parts are suitable for applications requiring superior thermal performance or lower leakage current. Both maintain active status and ROHS3 compliance.

The B290Q-13-F (Diodes Incorporated) provides full electrical and mechanical equivalence with the added benefit of AEC-Q101 automotive qualification, matching the original part's automotive-grade designation. This part offers superior reverse leakage performance (7 µA) and is recommended for automotive applications requiring certified components.

The B290-13-F (Diodes Incorporated) is electrically equivalent but supplied in Cut Tape (CT) & Digi-Reel® packaging rather than Tape & Reel (TR). This part maintains identical electrical specifications and active status.

Not Recommended - Reduced Current Rating:

The B190BQ-13-F (Diodes Incorporated) operates at 1A average rectified current, providing only half the current capacity of the SS29HM4G. This part is not suitable for applications requiring 2A current handling and should be selected only when circuit requirements are confirmed to operate at 1A or below.

Frequently Asked Questions (FAQ)

Q: Can the SS29 directly replace the SS29HM4G in all applications?

A: Yes. The SS29 provides identical electrical specifications (90V, 2A, 850 mV forward voltage) and package configuration (DO-214AA SMB). Both parts share the same base product number and are mechanically and electrically interchangeable. The primary difference is product status: SS29HM4G is discontinued while SS29 remains active.

Q: What is the difference between the Vishay SS2H9 variants and the original SS29HM4G?

A: The SS2H9-E3/5BT and SS2H9-E3/52T maintain identical voltage (90V) and current (2A) ratings in the same DO-214AA package. The primary differences are: forward voltage is lower (790 mV versus 850 mV), reverse leakage is significantly lower (10 µA versus 100 µA), and operating temperature range is extended (-65°C ~ 175°C versus -55°C ~ 150°C). These represent performance improvements suitable for demanding applications.

Q: Why is the B190BQ-13-F listed as a substitute if it has only 1A current rating?

A: The B190BQ-13-F is listed as a substitute option for applications where circuit requirements have been verified to operate at 1A or below. It is not a direct equivalent for 2A applications. Selection of this part requires confirmation that the application does not exceed 1A average rectified current.

Q: What is the significance of AEC-Q101 qualification?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. The original SS29HM4G carries this qualification, as does the B290Q-13-F substitute. For automotive applications, AEC-Q101 qualified parts are preferred to ensure compliance with automotive reliability and quality standards. The SS29, SS2H9 variants, and B290-13-F do not carry this qualification.

Q: Are there packaging differences between substitute options?

A: Yes. The SS2H9-E3/5BT and SS2H9-E3/52T are supplied in Tape & Reel (TR) packaging. The B290Q-13-F is also supplied in Tape & Reel (TR). The B290-13-F is supplied in Cut Tape (CT) & Digi-Reel® packaging. All parts use the same DO-214AA (SMB) component package. Packaging differences affect handling and assembly processes but not electrical or mechanical compatibility.

Q: Can I use the SS2H9-E3/5BT in place of the SS29HM4G in a -55°C to 150°C temperature range application?

A: Yes. Although the SS2H9-E3/5BT has an extended operating temperature range of -65°C ~ 175°C, it fully encompasses the -55°C ~ 150°C requirement of the original part. The extended range provides additional design margin and is not a limitation for this application.

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

A: This specification indicates the diode exhibits fast recovery characteristics with a recovery time of 500 nanoseconds or less when switching currents greater than 200 milliamps. All listed substitute parts share this identical speed specification, ensuring equivalent switching performance.

Q: Is ROHS3 compliance maintained across all substitute parts?

A: Yes. All substitute parts listed maintain ROHS3 compliance, matching the environmental compliance status of the original SS29HM4G. This ensures compatibility with regulatory requirements for restricted substances in electronic components.

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