S1G-LTP Equivalent & Substitute Parts Reference

Part Overview

The S1G-LTP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 400 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AA (HSMB) package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent and substitute parts is necessary to maintain supply chain continuity for existing applications and to support ongoing production of systems utilizing this diode.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1 @ 1 A	V
Reverse Recovery Time (trr)	2	µs
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Capacitance @ Vr, F	12	pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the S1G-LTP is determined by electrical and mechanical parameter equivalence within the general-purpose rectifier diode category. The critical parameters that define substitutability are:

Voltage Rating: DC reverse voltage of 400 V maximum
Current Rating: Average rectified current of 1 A
Forward Voltage Drop: Maximum 1.1 V at 1 A forward current
Package Type: DO-214AA (SMB) surface mount configuration
Recovery Characteristics: Standard recovery with reverse recovery time of 2 µs
Reverse Leakage: Maximum 5 µA at 400 V
Thermal Range: Operating junction temperature from -55°C to 150°C
Compliance: ROHS3 compliance and MSL 1 rating

All identified substitute parts meet these electrical and mechanical specifications, enabling direct functional replacement in applications designed for the S1G-LTP. Substitute parts are sourced from Taiwan Semiconductor Corporation and Panjit International Inc., both established manufacturers of standard rectifier diodes.

Parameter Comparison

Parameter	S1G-LTP (Micro Commercial Co)	S1GB (Taiwan Semiconductor)	S1GBH (Taiwan Semiconductor)	S1G_R1_00001 (Panjit International)
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 V	400 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	1.1 V @ 1 A	1.1 V @ 1 A	1.1 V @ 1 A
Speed	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V	1 µA @ 400 V
Capacitance @ Vr, F	12 pF @ 4V, 1MHz	12 pF @ 4V, 1MHz	12 pF @ 4V, 1MHz	12 pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C
Technology	Standard	Standard	Standard	Standard
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Not For New Designs	Active	Active	Active
Grade / Qualification	—	—	Automotive / AEC-Q101	—

Engineering Selection Recommendations

S1GB (Taiwan Semiconductor Corporation) is a direct parametric equivalent suitable for general-purpose applications. This part maintains active product status and carries full ROHS3 compliance with MSL 1 rating, ensuring long-term availability and supply chain stability.

S1GBH (Taiwan Semiconductor Corporation) is functionally equivalent to the S1G-LTP with the additional qualification of AEC-Q101 automotive-grade certification. This part is appropriate for applications requiring automotive-grade reliability standards and is recommended for systems subject to automotive qualification requirements.

S1G_R1_00001 (Panjit International Inc.) is a parametric equivalent with improved reverse leakage characteristics (1 µA versus 5 µA at 400 V). This part maintains active product status and full compliance certifications. The lower reverse leakage may provide performance benefits in applications sensitive to leakage current.

All three substitute parts are available in active production status, ensuring sustained supply availability compared to the S1G-LTP, which is designated "Not For New Designs."

Frequently Asked Questions (FAQ)

Q: Can the S1GB be used as a direct replacement for the S1G-LTP?

A: Yes. The S1GB meets all electrical and mechanical parameters of the S1G-LTP, including voltage rating (400 V), current rating (1 A), forward voltage drop (1.1 V @ 1 A), package type (DO-214AA SMB), and thermal operating range (-55°C to 150°C). Both parts are ROHS3 compliant with MSL 1 rating.

Q: What is the difference between S1GB and S1GBH?

A: The S1GBH carries AEC-Q101 automotive-grade qualification, while the S1GB is a standard industrial-grade part. Both share identical electrical specifications and package configuration. The S1GBH is specified for applications requiring automotive reliability standards.

Q: Does S1G_R1_00001 offer any performance advantage over the other substitutes?

A: The S1G_R1_00001 exhibits lower reverse leakage current (1 µA versus 5 µA at 400 V). This characteristic may be beneficial in applications where leakage current contributes to power dissipation or circuit performance. All other electrical and mechanical parameters remain equivalent.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All substitute parts are supplied in DO-214AA (SMB) surface mount package configuration with Tape & Reel (TR) packaging, matching the S1G-LTP mechanical specifications for PCB assembly compatibility.

Q: Why is the S1G-LTP marked "Not For New Designs"?

A: This designation indicates the part has reached end-of-life status. The substitute parts listed (S1GB, S1GBH, S1G_R1_00001) are all in active production status, providing long-term supply assurance for new designs and ongoing production support.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts carry ROHS3 compliance certification and MSL 1 (Unlimited) moisture sensitivity rating, meeting environmental and handling requirements equivalent to the S1G-LTP.

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