SK1035-TP Equivalent & Substitute Parts

Part Overview

The SK1035-TP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 35V DC reverse voltage and 10A average rectified current in a DO-214AB (SMC) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The SK1035-TP operates across a junction temperature range of -55°C to 125°C and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	35	V
Current - Average Rectified (Io)	10	A
Voltage - Forward (Vf) (Max) @ If	650 mV @ 10 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	1	mA @ 35 V
Capacitance @ Vr, F	500	pF @ 4V, 1MHz
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55 to 125	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SK1035-TP is determined by the following critical electrical and mechanical parameters:

Voltage Rating (Vr): The reverse voltage rating must equal or exceed 35V. Parts with lower voltage ratings cannot be used as direct substitutes.

Current Rating (Io): The average rectified current must equal or exceed 10A. Parts with lower current ratings are unsuitable for equivalent replacement.

Package Type: All substitutes must use the DO-214AB (SMC) surface mount package to ensure mechanical and thermal compatibility.

Technology: All substitutes must employ Schottky diode technology to maintain switching speed and forward voltage characteristics.

Forward Voltage (Vf): Forward voltage at rated current should remain within acceptable design margins. The SK1035-TP specifies 650 mV @ 10A.

Speed Characteristics: Fast recovery time (≤ 500ns, > 200mA) is required for equivalent performance.

Substitute parts are grouped into two categories: direct equivalents (matching or exceeding all parameters) and similar alternatives (meeting voltage and current requirements with acceptable performance trade-offs).

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ If	Package	Temp Range	Product Status	RoHS Status
SK1035-TP	Micro Commercial Co	35V	10A	650 mV @ 10A	DO-214AB	-55 to 125°C	Obsolete	ROHS3
SK1045-LTP	Micro Commercial Co	45V	10A	550 mV @ 10A	DO-214AB	-55 to 150°C	Active	ROHS3
LSM835J/TR13	Microchip Technology	35V	8A	520 mV @ 8A	DO-214AB	-55 to 150°C	Active	RoHS non-compliant
HSM835J/TR13	Microchip Technology	35V	8A	620 mV @ 8A	DO-214AB	-55 to 175°C	Active	RoHS non-compliant
LSM535J/TR13	Microchip Technology	35V	5A	520 mV @ 5A	DO-214AB	-55 to 150°C	Active	RoHS non-compliant
B530C-13-F	Diodes Incorporated	30V	5A	550 mV @ 5A	DO-214AB	-55 to 150°C	Active	ROHS3
B330-13-F	Diodes Incorporated	30V	3A	500 mV @ 3A	DO-214AB	-55 to 125°C	Active	ROHS3
5821SMJ/TR13	Microchip Technology	30V	3A	480 mV @ 3A	DO-214AB	-55 to 150°C	Active	RoHS non-compliant
HSM830J/TR13	Microchip Technology	30V	8A	620 mV @ 8A	DO-214AB	-55 to 175°C	Active	RoHS non-compliant
LSM335J/TR13	Microchip Technology	35V	3A	520 mV @ 3A	DO-214AB	-55 to 150°C	Active	RoHS non-compliant
MBRS330T3G	onsemi	30V	3A	500 mV @ 3A	DO-214AB	-65 to 150°C	Active	ROHS3

Engineering Selection Recommendations

Direct Equivalent (Preferred for Obsolete Part Replacement):

SK1045-LTP from Micro Commercial Co is the primary equivalent. It maintains the same 10A current rating and 35V voltage class (with 45V capability), uses the identical DO-214AB package, and is currently in active production status. The SK1045-LTP offers improved forward voltage characteristics (550 mV vs. 650 mV @ 10A) and extended junction temperature range (-55°C to 150°C vs. -55°C to 125°C). Both parts are RoHS3 compliant.

Alternative Substitutes (Current Availability):

For applications where 10A current capacity is not required, the following active parts provide equivalent voltage and package compatibility:

LSM835J/TR13 and HSM835J/TR13 both provide 35V/8A capability in DO-214AB packages with active product status. LSM835J/TR13 offers superior forward voltage performance (520 mV @ 8A) and is RoHS non-compliant. HSM835J/TR13 provides extended temperature range (-55°C to 175°C) but is also RoHS non-compliant.

LSM535J/TR13 provides 35V/5A capability with active status and RoHS non-compliance.

Lower Voltage Alternatives:

Parts rated at 30V (B530C-13-F, B330-13-F, HSM830J/TR13, 5821SMJ/TR13, MBRS330T3G) are suitable only for applications where the design voltage margin permits operation below 35V. These parts are not direct equivalents due to reduced voltage rating.

Compliance Considerations:

SK1045-LTP is the only active substitute maintaining RoHS3 compliance. All Microchip Technology alternatives (LSM series, HSM series, 5821SMJ/TR13) are RoHS non-compliant. Diodes Incorporated (B330-13-F, B530C-13-F) and onsemi (MBRS330T3G) alternatives maintain RoHS3 compliance but with reduced current or voltage ratings.

Frequently Asked Questions (FAQ)

Q: Can SK1045-LTP directly replace SK1035-TP in all applications?

A: SK1045-LTP is a direct functional equivalent. It maintains the 10A current rating, uses the same DO-214AB package, and operates across the same temperature range with extended upper limit. The 45V rating provides additional voltage margin over the 35V requirement. Forward voltage is improved (550 mV vs. 650 mV @ 10A), which may reduce power dissipation in the application.

Q: Why are Microchip Technology parts (LSM and HSM series) listed as alternatives if they have lower current ratings?

A: These parts are listed as similar alternatives for applications where the full 10A capacity is not required. LSM835J/TR13 and HSM835J/TR13 provide 8A capability at 35V in the same package. They are suitable substitutes only when circuit design permits operation at reduced current levels. These parts are not direct equivalents due to current rating mismatch.

Q: What is the significance of the 30V-rated parts in the substitute list?

A: Parts rated at 30V (B530C-13-F, B330-13-F, HSM830J/TR13, 5821SMJ/TR13, MBRS330T3G) do not meet the 35V voltage requirement of the SK1035-TP. These parts are included in the reference data but are not suitable substitutes unless the application design permits operation at reduced voltage margins. Use of 30V parts in a 35V-rated circuit creates reliability risk.

Q: Are there package compatibility concerns when substituting these parts?

A: All listed substitutes use the DO-214AB (SMC) surface mount package, which is mechanically and thermally compatible with the SK1035-TP. No PCB layout modifications are required for package substitution. Thermal performance remains consistent across all listed parts in this package class.

Q: What is the impact of forward voltage differences between SK1035-TP and SK1045-LTP?

A: SK1045-LTP exhibits lower forward voltage (550 mV @ 10A) compared to SK1035-TP (650 mV @ 10A). This 100 mV reduction decreases power dissipation in the diode, resulting in lower junction temperature and improved thermal performance. This is a beneficial characteristic for system reliability.

Q: Why do some substitutes show RoHS non-compliance?

A: RoHS non-compliance indicates these parts may contain restricted substances. Selection of RoHS non-compliant parts requires verification against specific application and regulatory requirements. For applications requiring RoHS3 compliance, SK1045-LTP, B330-13-F, B530C-13-F, and MBRS330T3G are compliant alternatives.

Q: Can LSM835J/TR13 be used as a substitute if the application only requires 8A instead of 10A?

A: LSM835J/TR13 is suitable for applications designed for 8A operation at 35V. The part maintains voltage rating equivalence and uses the same package. However, this represents a current derating from the original 10A specification. Circuit redesign or thermal analysis may be necessary to confirm suitability in the specific application context.

Q: What is the difference between SK1035-TP and SK1045-LTP beyond voltage rating?

A: Both parts share the same 10A current rating and DO-214AB package. SK1045-LTP provides 45V reverse voltage capability (vs. 35V), lower forward voltage (550 mV vs. 650 mV @ 10A), extended junction temperature range (-55°C to 150°C vs. -55°C to 125°C), and active product status (vs. obsolete). SK1045-LTP is the recommended replacement for obsolete SK1035-TP applications.

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