SM4004 Equivalent & Substitute Parts

Part Overview

The SM4004 is a general-purpose rectifier diode manufactured by Diotec Semiconductor, designed for surface mount applications in the DO-213AB MELF package. This component operates at 400 V DC reverse voltage with 1 A average rectified current capacity. The part maintains Active product status with standard recovery characteristics suitable for general rectification circuits. Substitute parts are identified based on matching electrical specifications and mechanical compatibility to ensure functional equivalence in circuit applications.

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)	1.5	µs
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Speed Classification	Standard Recovery >500ns, > 200mA (Io)	-
Package / Case	DO-213AB, MELF	-
Mounting Type	Surface Mount	-
Operating Temperature - Junction	-50 to 175	°C
Technology	Standard	-

Substitute Part Grouping Explanation

Substitute parts for the SM4004 are identified through parametric equivalence matching. The critical parameters that determine substitution eligibility are:

Voltage - DC Reverse (Vr) (Max): 400 V minimum
Current - Average Rectified (Io): 1 A minimum
Voltage - Forward (Vf) (Max) @ If: 1.1 V or lower @ 1 A
Reverse Recovery Time (trr): 1.5 µs or faster
Current - Reverse Leakage @ Vr: 5 µA or lower @ 400 V
Package / Case: DO-213AB MELF surface mount
Mounting Type: Surface Mount
Operating Temperature - Junction: -50°C to 175°C minimum range
Technology: Standard recovery classification

Parts meeting all specified parameters within these tolerances are classified as direct parametric equivalents and may be substituted without circuit redesign.

Parameter Comparison

Parameter	SM4004 (Main Part)	SM4004 (Substitute)	Match Status
Manufacturer	Diotec Semiconductor	Diotec Semiconductor	Identical
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	Identical
Current - Average Rectified (Io)	1 A	1 A	Identical
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	1.1 V @ 1 A	Identical
Reverse Recovery Time (trr)	1.5 µs	1.5 µs	Identical
Current - Reverse Leakage @ Vr	5 µA @ 400 V	5 µA @ 400 V	Identical
Speed Classification	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Identical
Package / Case	DO-213AB, MELF	DO-213AB, MELF	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Operating Temperature - Junction	-50°C ~ 175°C	-50°C ~ 175°C	Identical
Product Status	Active	Active	Identical
Technology	Standard	Standard	Identical

Engineering Selection Recommendations

The SM4004 substitute part identified maintains identical electrical and mechanical specifications to the main part. Both components are manufactured by Diotec Semiconductor and carry Active product status, indicating ongoing production and supply availability. The substitute part is packaged in the DO-213AB MELF surface mount configuration, ensuring mechanical compatibility with existing PCB layouts and assembly processes.

Selection between the main part and substitute should be based on inventory availability, lead time requirements, and supplier logistics. Both parts meet identical parametric requirements for 400 V reverse voltage operation, 1 A rectified current capacity, and standard recovery speed classification. The operating temperature range of -50°C to 175°C is maintained across both parts, supporting equivalent thermal performance in target applications.

Frequently Asked Questions (FAQ)

Q: What are the primary electrical parameters that define SM4004 substitution eligibility?

A: The critical parameters are 400 V maximum DC reverse voltage, 1 A average rectified current, 1.1 V maximum forward voltage at 1 A, 1.5 µs reverse recovery time, and 5 µA maximum reverse leakage current at 400 V. Parts matching all these specifications are electrically equivalent.

Q: Is the DO-213AB MELF package critical for substitution?

A: Yes. The SM4004 is specified for surface mount DO-213AB MELF packaging. Substitute parts must use identical package geometry to ensure compatibility with PCB footprints and automated assembly equipment.

Q: Can the SM4004 be substituted with parts having faster recovery times?

A: Parts with faster reverse recovery times (trr < 1.5 µs) meet the minimum performance requirement and are functionally compatible. However, parts with slower recovery times do not meet the specified parameter and are not suitable substitutes.

Q: What is the significance of the standard recovery speed classification?

A: Standard recovery classification indicates recovery time greater than 500 ns at currents exceeding 200 mA. This classification determines the diode's switching behavior in rectification circuits and must be maintained in substitute parts.

Q: Are there temperature range considerations for substitute part selection?

A: The operating junction temperature range of -50°C to 175°C must be maintained. Substitute parts with narrower temperature ranges are not equivalent and do not meet substitution criteria.

Q: How does forward voltage affect circuit performance in substitution?

A: Forward voltage at 1 A is specified at 1.1 V maximum. Substitute parts with higher forward voltage values introduce additional power dissipation and heat generation. Parts meeting the 1.1 V specification or lower maintain equivalent circuit performance.

Q: Is product status relevant to substitution decisions?

A: Active product status indicates current manufacturing and supply availability. Both the main part and identified substitutes maintain Active status, ensuring long-term component availability and supply chain stability.

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