KMB225S Equivalent & Substitute Parts

Part Overview

The KMB225S is a single-phase Schottky bridge rectifier diode manufactured by SMC Diode Solutions, rated for 250 V peak reverse voltage and 2 A average rectified current. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and procurement needs. The KMB225S features surface mount packaging in a 4-SMD Gull Wing configuration, suitable for automated assembly processes.

Key Parameters

Parameter	Value
Manufacturer Part Number	KMB225S
Manufacturer	SMC Diode Solutions
Category	Diodes
Diode Type	Single Phase
Technology	Schottky
Voltage - Peak Reverse (Max)	250 V
Current - Average Rectified (Io)	2 A
Voltage - Forward (Vf) (Max) @ If	920 mV @ 2 A
Current - Reverse Leakage @ Vr	50 µA @ 250 V
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
Supplier Device Package	MBS
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the KMB225S is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Diode Type: Single Phase
Technology: Schottky
Voltage - Peak Reverse (Max): Must equal or exceed 250 V
Current - Average Rectified (Io): Must equal or exceed 2 A
Voltage - Forward (Vf) (Max) @ If: Must be compatible at 2 A operation
Current - Reverse Leakage @ Vr: Must be acceptable at rated voltage
Operating Temperature Range: Must encompass -55°C ~ 150°C (TJ)

Mechanical Compatibility Criteria:

Mounting Type: Surface Mount
Package / Case: 4-SMD, Gull Wing
Supplier Device Package: MBS

The KMB220S is identified as a manufacturer-recommended substitute. While the KMB220S operates at a reduced peak reverse voltage rating of 200 V compared to the KMB225S 250 V specification, it maintains identical current rating, forward voltage characteristics, reverse leakage performance, operating temperature range, and mechanical packaging. The KMB220S is suitable for applications where the 200 V peak reverse voltage specification meets circuit requirements.

Parameter Comparison

Parameter	KMB225S (Main Part)	KMB220S (Substitute)
Manufacturer	SMC Diode Solutions	SMC Diode Solutions
Diode Type	Single Phase	Single Phase
Technology	Schottky	Schottky
Voltage - Peak Reverse (Max)	250 V	200 V
Current - Average Rectified (Io)	2 A	2 A
Voltage - Forward (Vf) (Max) @ If	920 mV @ 2 A	900 mV @ 2 A
Current - Reverse Leakage @ Vr	50 µA @ 250 V	50 µA @ 200 V
Operating Temperature Range	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount	Surface Mount
Package / Case	4-SMD, Gull Wing	4-SMD, Gull Wing
Supplier Device Package	MBS	MBS
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active

Engineering Selection Recommendations

The KMB220S is the manufacturer-recommended substitute for the obsolete KMB225S. Selection of the KMB220S is appropriate for applications where the circuit peak reverse voltage requirement does not exceed 200 V. The KMB220S maintains active product status with SMC Diode Solutions, ensuring ongoing availability and supply chain continuity.

The KMB220S is ROHS3 compliant, providing enhanced environmental and regulatory compliance compared to the obsolete KMB225S. Both components share identical mechanical packaging (4-SMD, Gull Wing MBS), enabling direct board-level substitution without layout modifications.

For applications requiring the full 250 V peak reverse voltage specification of the KMB225S, alternative Schottky bridge rectifier diodes from other manufacturers with equivalent electrical and mechanical specifications must be evaluated.

Frequently Asked Questions (FAQ)

Q: Can the KMB220S directly replace the KMB225S in existing designs?

A: Direct replacement is possible only if the circuit peak reverse voltage requirement does not exceed 200 V. The KMB220S is rated for 200 V peak reverse voltage, compared to the KMB225S 250 V rating. Circuit analysis must confirm that the lower voltage rating is acceptable for the application.

Q: Are the mechanical packages identical between KMB225S and KMB220S?

A: Yes. Both components use 4-SMD Gull Wing packaging with MBS supplier device package designation. No PCB layout modifications are required for physical substitution.

Q: What is the difference in forward voltage between these parts?

A: The KMB225S specifies 920 mV maximum forward voltage at 2 A, while the KMB220S specifies 900 mV maximum forward voltage at 2 A. This 20 mV difference is within typical Schottky diode manufacturing tolerances and does not affect circuit functionality in standard rectification applications.

Q: Is the KMB220S RoHS compliant?

A: Yes. The KMB220S is ROHS3 compliant. The KMB225S product status is obsolete and does not carry current RoHS certification information.

Q: What is the current availability of these parts?

A: The KMB225S (obsolete) has 994 pieces in stock. The KMB220S (active) has 944 pieces in stock. The KMB220S is the recommended substitute due to its active product status and ongoing manufacturer support.

Q: Are the operating temperature ranges identical?

A: Yes. Both the KMB225S and KMB220S operate across the identical temperature range of -55°C to 150°C (TJ).

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