SM4933-TP Equivalent & Substitute Parts

Part Overview

The SM4933-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 50V DC reverse voltage and 1A 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 part operates across a junction temperature range of -55°C to 150°C and complies with RoHS3 standards.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	200	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Capacitance @ Vr, F	15	pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SM4933-TP 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 50V maximum
Current Rating: Average rectified current of 1A
Package Type: DO-214AC (SMA) surface mount configuration
Speed Classification: Fast recovery diode characteristics (≤ 500ns, > 200mA)
Reverse Recovery Time: Performance within fast recovery specifications
Reverse Leakage Current: 5 µA @ 50V
Capacitance: 15pF @ 4V, 1MHz
Compliance: RoHS3 compliance and MSL Level 1

The RS1A-13-F from Diodes Incorporated meets all these electrical and mechanical requirements and is classified as an active product, making it a direct functional equivalent for the obsolete SM4933-TP.

Parameter Comparison

Parameter	SM4933-TP (Micro Commercial Co)	RS1A-13-F (Diodes Incorporated)	Match Status
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	Equivalent
Current - Average Rectified (Io)	1 A	1 A	Equivalent
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Equivalent
Reverse Recovery Time (trr)	200 ns	150 ns	Compatible (RS1A-13-F superior)
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	Equivalent
Capacitance @ Vr, F	15 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	Equivalent
Package / Case	DO-214AC, SMA	DO-214AC, SMA	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Operating Temperature - Junction	-55 to 150 °C	-65 to 150 °C	Compatible (RS1A-13-F wider range)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent
Product Status	Obsolete	Active	Substitute is active

Engineering Selection Recommendations

The RS1A-13-F from Diodes Incorporated is the direct equivalent substitute for the obsolete SM4933-TP. Both components share identical electrical ratings (50V, 1A) and mechanical packaging (DO-214AC SMA surface mount). The RS1A-13-F maintains full compliance with RoHS3 standards and carries MSL Level 1 classification, matching the original part's environmental and regulatory requirements.

The RS1A-13-F demonstrates superior performance characteristics in two areas: reverse recovery time is reduced to 150 ns (compared to 200 ns), and the operating temperature range extends to -65°C (compared to -55°C minimum). These improvements provide enhanced performance margins without introducing any compatibility concerns.

The RS1A-13-F is actively manufactured and maintained in production inventory, ensuring long-term availability and supply chain continuity for new designs and production runs requiring this diode specification.

Frequently Asked Questions (FAQ)

Q: Can the RS1A-13-F directly replace the SM4933-TP in existing designs?

A: Yes. The RS1A-13-F is electrically and mechanically equivalent to the SM4933-TP. Both components have identical voltage ratings (50V), current ratings (1A), package types (DO-214AC SMA), and compliance certifications (RoHS3, MSL Level 1). No circuit modifications are required.

Q: What is the difference in reverse recovery time between these parts?

A: The SM4933-TP has a reverse recovery time of 200 ns, while the RS1A-13-F has 150 ns. The RS1A-13-F exhibits faster switching characteristics, which is beneficial for high-frequency applications and reduces switching losses.

Q: Are there packaging differences between SM4933-TP and RS1A-13-F?

A: Both parts use the DO-214AC (SMA) surface mount package. The SM4933-TP is supplied in standard packaging, while the RS1A-13-F is supplied in Tape & Reel (TR) format. This difference affects procurement and automated assembly processes but does not affect component functionality or performance.

Q: Does the RS1A-13-F meet the same environmental and compliance standards?

A: Yes. The RS1A-13-F is RoHS3 compliant and carries MSL Level 1 (Unlimited) moisture sensitivity classification, identical to the SM4933-TP. Both parts are suitable for the same environmental and regulatory applications.

Q: Why is the SM4933-TP classified as obsolete?

A: The SM4933-TP is no longer in active production by Micro Commercial Co. The RS1A-13-F from Diodes Incorporated is an actively manufactured equivalent that fulfills the same functional requirements with equivalent or superior electrical characteristics.

Q: What is the operating temperature range difference?

A: The SM4933-TP operates from -55°C to 150°C junction temperature, while the RS1A-13-F operates from -65°C to 150°C. The RS1A-13-F provides a wider low-temperature operating range, offering additional design margin for cold-environment applications.

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