SS29 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS29 is an active Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 90V DC reverse voltage and 2A average rectified current in a DO-214AA (SMB) surface mount package. This component is designed for fast recovery applications requiring low forward voltage drop characteristics. Equivalent and substitute parts are identified based on matching or superior electrical ratings and compatible package configurations to support design flexibility, inventory optimization, and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	90	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 2 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	100 µA @ 90 V	µA
Technology	Schottky	—
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55°C ~ 150°C	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the SS29 is determined by the following criteria:

Direct Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) rating must equal or exceed 90V
Current - Average Rectified (Io) rating must equal or exceed 2A
Technology must be Schottky
Speed classification must be Fast Recovery (≤ 500ns, > 200mA)
Operating temperature range must encompass or match the -55°C to 150°C specification

Package Compatibility:

Surface mount packages in the DO-214 family (DO-214AA, DO-214AC) are mechanically and electrically compatible for PCB assembly
Tape & Reel (TR) and Cut Tape (CT) packaging formats are logistics variants and do not affect electrical substitution

Compliance Requirements:

RoHS3 compliance is mandatory
MSL rating of 1 (Unlimited) is required
REACH Unaffected status is required

Two substitute parts meet these criteria with the following classifications:

SK29 (Good-Ark Semiconductor): Direct manufacturer equivalent with identical voltage and current ratings, automotive-grade qualification (AEC-Q101), and DO-214AC (SMA) package variant.

STPS1H100U (STMicroelectronics): Similar part with superior voltage rating (100V) but reduced current rating (1A), suitable for applications where the 2A requirement can be relaxed and higher voltage margin is beneficial.

Parameter Comparison

Parameter	SS29 (Taiwan Semiconductor)	SK29 (Good-Ark Semiconductor)	STPS1H100U (STMicroelectronics)
Voltage - DC Reverse (Vr) (Max)	90 V	90 V	100 V
Current - Average Rectified (Io)	2 A	2 A	1 A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 2 A	790 mV @ 2 A	770 mV @ 1 A
Current - Reverse Leakage @ Vr	100 µA @ 90 V	30 µA @ 90 V	4 µA @ 100 V
Speed	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Technology	Schottky	Schottky	Schottky
Package / Case	DO-214AA, SMB	DO-214AC, SMA	DO-214AA, SMB
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	-55°C to 175°C (Max)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active

Engineering Selection Recommendations

SK29 Selection Criteria:

The SK29 is a direct functional equivalent to the SS29 with identical voltage and current ratings. This part is manufactured by Good-Ark Semiconductor and carries AEC-Q101 automotive qualification, indicating compliance with automotive-grade reliability standards. The SK29 exhibits superior electrical performance with lower forward voltage drop (790 mV vs. 850 mV at 2A) and significantly reduced reverse leakage current (30 µA vs. 100 µA at 90V). The package variant (DO-214AC/SMA vs. DO-214AA/SMB) requires PCB layout verification for mechanical fit, though both are surface mount configurations within the DO-214 family. All compliance requirements (ROHS3, MSL 1, REACH Unaffected) are satisfied. This part is suitable for direct substitution in applications requiring 2A at 90V with automotive-grade reliability.

STPS1H100U Selection Criteria:

The STPS1H100U is manufactured by STMicroelectronics and provides a higher voltage rating (100V) with reduced current capacity (1A). This part is applicable only to circuit designs where the maximum current requirement does not exceed 1A and where the additional 10V voltage margin provides design benefit. The STPS1H100U demonstrates superior reverse leakage performance (4 µA at 100V) and lower forward voltage drop (770 mV at 1A). The operating temperature maximum extends to 175°C, providing enhanced thermal margin. All compliance requirements are met. This part is suitable for substitution in applications with current requirements ≤ 1A and 90V to 100V voltage specifications.

Frequently Asked Questions (FAQ)

Q: Can SK29 be used as a direct replacement for SS29 without circuit modification?

A: The SK29 meets all electrical requirements for direct substitution (90V, 2A, Schottky, Fast Recovery). However, the package variant (DO-214AC/SMA vs. DO-214AA/SMB) requires verification of PCB footprint compatibility. Both packages are surface mount configurations within the DO-214 family, but physical dimensions differ. Consult package datasheets to confirm PCB layout compatibility before assembly.

Q: What is the primary limitation of STPS1H100U as a substitute?

A: The STPS1H100U has a maximum current rating of 1A, compared to the SS29 and SK29 ratings of 2A. This part is suitable only for applications where circuit current requirements do not exceed 1A. If the design requires 2A operation, STPS1H100U is not a valid substitute.

Q: Are all three parts RoHS3 compliant?

A: Yes. SS29, SK29, and STPS1H100U are all ROHS3 Compliant with MSL rating of 1 (Unlimited) and REACH Unaffected status, meeting current environmental and regulatory requirements.

Q: How do forward voltage characteristics compare across the three parts?

A: At 2A operation, SK29 exhibits the lowest forward voltage drop (790 mV), followed by SS29 (850 mV). STPS1H100U operates at 1A with 770 mV forward voltage, making direct comparison at 2A not applicable. Lower forward voltage drop reduces power dissipation and heat generation in the circuit.

Q: What is the significance of reverse leakage current differences?

A: Reverse leakage current affects power consumption in standby or reverse-biased conditions. SK29 (30 µA) and STPS1H100U (4 µA) have significantly lower leakage than SS29 (100 µA). In applications with strict power budget requirements, lower leakage parts reduce parasitic current draw.

Q: Can these parts be used interchangeably in automotive applications?

A: SK29 carries AEC-Q101 automotive qualification, making it suitable for automotive-grade applications. SS29 and STPS1H100U do not list automotive qualification. If automotive-grade reliability is required, SK29 is the appropriate selection.

Q: What packaging considerations apply to PCB assembly?

A: SS29 and STPS1H100U use DO-214AA (SMB) package; SK29 uses DO-214AC (SMA) package. Both are surface mount configurations compatible with standard reflow soldering processes. Assembly equipment and PCB footprints must match the selected package variant. Verify footprint dimensions in component datasheets before PCB design finalization.

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