SK310B-TP Equivalent & Substitute Parts

Part Overview

The SK310B-TP is a Schottky rectifier diode rated for 100 V DC reverse voltage and 3 A average rectified current in a DO-214AA (SMB) surface mount package. Manufactured by Micro Commercial Co, this component is classified as obsolete. Due to its obsolete status, equivalent substitute parts from active manufacturers are necessary to maintain design continuity and ensure long-term component availability for new production and field replacements.

Key Parameters

Parameter	Value
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	100 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SK310B-TP is determined by strict equivalence across the following critical parameters:

Voltage Rating: 100 V DC reverse voltage (Vr) maximum
Current Rating: 3 A average rectified current (Io)
Technology: Schottky diode
Package: DO-214AA / SMB surface mount
Speed Classification: Fast recovery ≤ 500ns at > 200mA
Compliance: ROHS3 compliant, MSL 1

Substitute parts must match or exceed these specifications without degradation of electrical performance. Forward voltage (Vf), reverse leakage current (Ir), and junction temperature ratings may vary within acceptable design margins. Packaging format (Cut Tape vs. Tape & Reel) does not affect electrical equivalence but impacts procurement and handling.

Parameter Comparison

Parameter	SK310B-TP	SK310B-LTP	CDBB3100-G	NRVTSS3100ET3G	STPS3H100U
Manufacturer	Micro Commercial Co	Micro Commercial Co	Comchip Technology	onsemi	STMicroelectronics
Product Status	Obsolete	Active	Active	Last Time Buy	Active
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	100 V	100 V	100 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 3 A	850 mV @ 3 A	850 mV @ 3 A	995 mV @ 3 A	840 mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Current - Reverse Leakage @ Vr	500 µA @ 100 V	500 µA @ 100 V	500 µA @ 100 V	5 µA @ 100 V	1 µA @ 100 V
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55°C ~ 125°C	-55°C ~ 150°C	125°C (Max)	-55°C ~ 175°C	175°C (Max)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute: SK310B-LTP

The SK310B-LTP is the direct equivalent from Micro Commercial Co, the original manufacturer. It maintains identical electrical specifications (100 V, 3 A, 850 mV forward voltage) and is in active production status. The extended junction temperature range (-55°C ~ 150°C) provides improved thermal margin compared to the obsolete SK310B-TP. This part is the preferred choice for direct replacement in existing designs.

Secondary Substitute: STPS3H100U

The STPS3H100U from STMicroelectronics is an active production part with superior electrical characteristics. Forward voltage is reduced to 840 mV at 3 A, and reverse leakage current is significantly lower at 1 µA. The maximum junction temperature of 175°C exceeds the original specification. This part is suitable for applications requiring enhanced performance and long-term availability.

Tertiary Substitute: CDBB3100-G

The CDBB3100-G from Comchip Technology is an active production alternative with matching electrical specifications (100 V, 3 A, 850 mV forward voltage). This part provides a secondary source option with equivalent performance characteristics.

Alternative Substitute: NRVTSS3100ET3G

The NRVTSS3100ET3G from onsemi is classified as Last Time Buy and carries automotive qualification (AEC-Q101). Forward voltage is elevated at 995 mV, and reverse leakage is significantly reduced to 5 µA. The extended junction temperature range (-55°C ~ 175°C) and automotive-grade certification make this part suitable for automotive and high-reliability applications. However, the higher forward voltage may impact power dissipation in current-limited designs.

Frequently Asked Questions (FAQ)

Q: Can SK310B-LTP directly replace SK310B-TP in existing PCB designs?

A: Yes. The SK310B-LTP is electrically and mechanically equivalent to the SK310B-TP. Both use the DO-214AA (SMB) package with identical pinout and footprint. The primary difference is packaging format (Tape & Reel vs. Cut Tape), which does not affect PCB assembly compatibility.

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

A: Cut Tape packaging is supplied in individual strips suitable for manual handling and small-volume assembly. Tape & Reel packaging is supplied on continuous reels for automated pick-and-place equipment. Both formats contain identical components; the difference is in procurement and handling logistics only.

Q: Why does NRVTSS3100ET3G have higher forward voltage (995 mV) than the original part (850 mV)?

A: Forward voltage variation is a normal characteristic of Schottky diodes and depends on manufacturing process, doping levels, and junction design. The NRVTSS3100ET3G meets automotive qualification standards (AEC-Q101), which may impose different design parameters. Higher forward voltage results in increased power dissipation; verify thermal performance in power-sensitive applications.

Q: Is STPS3H100U suitable for all applications using SK310B-TP?

A: Yes. The STPS3H100U meets or exceeds all critical electrical specifications: 100 V reverse voltage, 3 A current rating, and fast recovery speed. The lower forward voltage (840 mV) and reverse leakage (1 µA) represent improved performance. The higher maximum junction temperature (175°C) provides additional thermal margin.

Q: Can I use NRVTSS3100ET3G in non-automotive applications?

A: Yes. Automotive-qualified components (AEC-Q101) meet stringent reliability and quality standards that exceed general industrial requirements. NRVTSS3100ET3G is suitable for any application requiring 100 V, 3 A Schottky rectification. However, verify that the higher forward voltage (995 mV) does not exceed thermal or efficiency requirements.

Q: What is the significance of MSL 1 (Unlimited) moisture sensitivity?

A: MSL 1 indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. This simplifies procurement, inventory management, and assembly logistics compared to higher MSL ratings.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (SK310B-LTP, CDBB3100-G, NRVTSS3100ET3G, STPS3H100U) are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for EU and global markets.

Q: What is the impact of reverse leakage current variation on circuit performance?

A: Reverse leakage current affects standby power consumption and circuit stability at high temperatures. The SK310B-TP and SK310B-LTP specify 500 µA leakage, while STPS3H100U specifies 1 µA and NRVTSS3100ET3G specifies 5 µA. Lower leakage improves efficiency in low-power or precision applications. Verify leakage requirements for your specific circuit topology.

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