SM4936A-TP Equivalent & Substitute Parts

Part Overview

The SM4936A-TP 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-214AC (SMA) package. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design requirements and procurement needs. The fast recovery characteristic (≤500 ns for currents >200 mA) positions this diode for applications requiring rapid switching performance in power conversion and protection circuits.

Substiute Parts

SM4936A-TP

Micro Commercial CoIn Stock: 731SM4936A-TP Datasheet

Current PartRFQ

FS1G-LTP

Micro Commercial CoIn Stock: 8702FS1G-LTP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SM4936A-TP is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Voltage - DC Reverse (Vr) (Max): 400 V
• Current - Average Rectified (Io): 1 A
• Package / Case: DO-214AC, SMA
• Mounting Type: Surface Mount
• Speed Classification: Fast Recovery ≤500 ns, >200 mA (Io)
• Current - Reverse Leakage @ Vr: 5 µA @ 400 V

Acceptable Variation Parameters:

• Reverse Recovery Time (trr): May be equal to or faster than the main part specification
• Capacitance @ Vr, F: Variation permitted within application tolerance
• Operating Temperature - Junction: Minimum operating range must encompass or exceed the main part range
• Packaging Format: Tape & Reel (TR) is acceptable as a packaging variant of the same component package

The FS1G-LTP meets all mandatory matching criteria and is classified as an active product, making it a direct functional equivalent to the obsolete SM4936A-TP.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: FS1G-LTP

The FS1G-LTP is the direct equivalent for SM4936A-TP replacement. Selection rationale is based on the following factors:

Product Status: FS1G-LTP is classified as active, ensuring ongoing availability and supply chain continuity, whereas SM4936A-TP is obsolete.

Electrical Equivalence: Both parts share identical voltage and current ratings (400 V, 1 A), matching reverse leakage current specifications (5 µA @ 400 V), and identical fast recovery speed classification. The FS1G-LTP exhibits superior reverse recovery time (150 ns versus 200 ns), representing an improvement in switching performance.

Compliance & Certifications: Both parts maintain ROHS3 compliance and identical moisture sensitivity classification (MSL 1), ensuring regulatory and environmental compatibility. Export classification (EAR99) and tariff codes (HTSUS 8541.10.0080) are identical.

Package Compatibility: Both components utilize the DO-214AC (SMA) surface mount package with identical mechanical and electrical interface specifications.

Temperature Range: FS1G-LTP operating temperature range (-50°C to 150°C) encompasses the critical upper temperature boundary of the main part. The lower temperature limit differs by 5°C; applications requiring operation below -50°C require circuit-level thermal analysis.

Packaging Format: FS1G-LTP is supplied in Tape & Reel format, standard for high-volume production environments. This represents a packaging variant only and does not affect functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can FS1G-LTP be used as a direct replacement for SM4936A-TP in existing designs?

A: Yes. FS1G-LTP meets all mandatory electrical and mechanical parameters for direct substitution. Both components share identical voltage ratings (400 V), current ratings (1 A), package type (DO-214AC, SMA), and fast recovery speed classification. The FS1G-LTP offers improved reverse recovery time (150 ns versus 200 ns), which is advantageous for switching applications.

Q: What is the difference in operating temperature range between these parts?

A: SM4936A-TP operates from -55°C to 150°C, while FS1G-LTP operates from -50°C to 150°C. The upper temperature limit is identical. The lower temperature limit differs by 5°C. For applications requiring operation below -50°C, thermal performance analysis of the specific circuit is necessary to determine if the reduced lower temperature specification impacts system performance.

Q: Are there packaging differences between SM4936A-TP and FS1G-LTP?

A: Both parts use the DO-214AC (SMA) surface mount package with identical mechanical dimensions and electrical interface. The primary packaging difference is the supply format: SM4936A-TP data does not specify packaging format, while FS1G-LTP is supplied in Tape & Reel (TR) format. This affects procurement and assembly processes but not component functionality or PCB compatibility.

Q: Do both parts meet the same regulatory and compliance standards?

A: Yes. Both SM4936A-TP and FS1G-LTP are ROHS3 compliant, carry identical moisture sensitivity level (MSL 1), and share the same export classification (EAR99) and tariff code (HTSUS 8541.10.0080). Regulatory and environmental compliance is equivalent.

Q: What is the significance of the reverse recovery time difference?

A: FS1G-LTP has a reverse recovery time of 150 ns compared to SM4936A-TP at 200 ns. Faster reverse recovery reduces switching losses and improves efficiency in high-frequency rectification and power conversion circuits. This represents a performance improvement for applications sensitive to switching speed.

Q: Is the capacitance difference between these parts significant?

A: FS1G-LTP has higher capacitance (50 pF @ 4V, 1MHz) compared to SM4936A-TP (15 pF @ 4V, 1MHz). For most general-purpose rectification applications, this difference is not critical. However, in high-frequency circuits or applications with strict capacitive loading requirements, circuit-level analysis may be necessary to confirm compatibility.

Q: Why is SM4936A-TP classified as obsolete?

A: Obsolete status indicates the part is no longer manufactured or supported by the original manufacturer. FS1G-LTP, classified as active, represents the current production equivalent and ensures access to ongoing supply and technical support.